EP4227478A1 - Strut that can be locked by an automatic locking system - Google Patents

Strut that can be locked by an automatic locking system Download PDF

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Publication number
EP4227478A1
EP4227478A1 EP22290005.2A EP22290005A EP4227478A1 EP 4227478 A1 EP4227478 A1 EP 4227478A1 EP 22290005 A EP22290005 A EP 22290005A EP 4227478 A1 EP4227478 A1 EP 4227478A1
Authority
EP
European Patent Office
Prior art keywords
slide
locking
pin
blocking
automatic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22290005.2A
Other languages
German (de)
French (fr)
Inventor
Bertrand Cupif
Emmanuel Beguier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Macc SA
Original Assignee
Macc SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Macc SA filed Critical Macc SA
Priority to EP22290005.2A priority Critical patent/EP4227478A1/en
Publication of EP4227478A1 publication Critical patent/EP4227478A1/en
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
    • E04G25/061—Shores or struts; Chocks telescopic with parts held together by positive means by pins
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
    • E04G25/061—Shores or struts; Chocks telescopic with parts held together by positive means by pins
    • E04G25/063—Shores or struts; Chocks telescopic with parts held together by positive means by pins with safety devices to avoid the accidental loss or unlocking of the pin, e.g. chains attaching the pin to the prop
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
    • E04G25/065—Shores or struts; Chocks telescopic with parts held together by positive means by a threaded nut

Definitions

  • the invention relates to a prop, more particularly a mason's prop.
  • prop in the rest of the description means a mason's prop, that is to say a prop which has all the robustness performances to support a work, maintain a concrete element, a frame, etc., unlike a stay or a rule, qualified as light or extensible which aims to support low loads of the type at most 30 kg.
  • a forestay comprises a barrel or outer tube forming the lower part of the forestay, a slider or inner tube which forms the upper part of the forestay, which is able to slide in the barrel and which comprises a plurality of regularly spaced through holes, a pin or pin which is most often captive and is intended to pass through a through hole to block the slide in translation, and a nut arranged on the upper part of the barrel to ensure fine adjustment of the total height of forestay and ensure effective clamping pressure.
  • the nut has a pair of handles or lugs that allow the nut to be screwed in or out.
  • the object of the invention is therefore to propose a prop that is simpler to operate, in particular allowing it to be implemented with one hand, and even to save installation time, while retaining its robustness.
  • the forestay comprises a shaft, a slide able to slide in the shaft and comprising through holes distributed (regularly) along the length of the slide, a locking pin, preferably captive, intended to be introduced into a through hole for locking the slide in the deployed position, and a nut with adjustment function end of the height of the forestay, the forestay being characterized in that it comprises an automatic system for blocking the slide in descent, which is capable of being implemented automatically after deployment of the slide and before installation of the locking pin.
  • this design of the stay allows implementation with one hand, the user having only to deploy the slide with one hand, and by releasing the slide, it is automatically blocked.
  • the user can then with the same hand, while the other can still be occupied, introduce the locking pin guaranteeing the blocking and the locking in position of the slide, this pin being obligatory for the resistance to the load of the mason's prop.
  • the user no longer needs both hands to set up the prop, which can greatly help him on a construction site and allow him to use his other hand concomitantly for another operation.
  • the automatic lowering blocking system comprises a blocking finger capable of being movable, preferably pivoting (relative to an axis perpendicular to the slide axis), and capable of being introduced automatically into a hole crossing the slide when releasing the slide without crossing the section (the diameter) of said slide, while the slide includes an anti-rotation means. Consequently, the blocking finger temporarily blocks the slide in position, and since it does not cross the section of the slide, it is very easy for the user to continue the deployment of the slide if necessary due to the mobility of the finger. and to ensure automatic blocking in another hole since the slide cannot rotate.
  • the automatic lowering blocking system comprises a support part which carries the pin and a blocking finger capable of pivoting, the part being in the form of a sleeve surrounding the slide and resting on the shaft or the nut, and being provided with a first radial orifice in which the locking finger is engaged and with a second opposite radial orifice in which the pin is adapted to be introduced.
  • the second radial orifice is in communication with a radial tubular housing which carries the pin; the tubular housing provides in particular a guiding function for the translation of the pin in a plane perfectly orthogonal to the direction of the slide.
  • the locking finger is in the free position by gravity.
  • the system is thus simple to manufacture, in particular being free of elastic means of the spring type.
  • the locking finger In the free position, the locking finger is able to abut against the slide during its deployment; it is when the locking finger encounters a hole in the slide that it is automatically inserted into it.
  • the blocking finger also constitutes an automatic indexing system for the introduction of the pin.
  • the pin is arranged in a fixed manner in the non-locking position (by suitable support means) so as to be radially opposite the locking finger.
  • the spindle is systematically already in the engagement position in front of a through hole because the locking position is already indexed due to the indexing performed by the locking finger in position in a hole of the slide.
  • the user does not have to think, the slide being locked in position at the level of a through hole, the pin can be introduced directly opposite the through hole receiving the opposite blocking finger.
  • the user only has to translate the pin in the through hole (in particular by a simple push), and locking is achieved extremely quickly.
  • the spindle being translated will effortlessly push the locking pin, pushing it out of the hole to completely cross the section of the slide.
  • the pin is arranged in a fixed manner in the non-locking position so as to be radially opposite the locking finger, makes it possible to distribute the forces exerted on the forestay in the support position, and thus not to risk deforming the locking finger.
  • the locking finger is movable in pivoting (relative to an axis perpendicular to the longitudinal direction of the forestay) and comprises a gripping extension which is arranged opposite the slide (facing the external environment), allowing the locking pin to be lifted (manually) by pivoting. It is thus very simple to disengage the locking pin if the user wishes to lower the slide when the locking pin has not been put in place. In addition, by unlocking the slide, that is to say by removing the pin from the through hole, the locking pin being outside the slide, by the weight of the slide, the latter immediately descends into the stowed position in the forestay shaft.
  • the slide includes an anti-rotation means with respect to the automatic system for blocking the slide in descent, in particular the slide has a longitudinal groove which is formed in the wall of the slide, being offset with respect to the longitudinal axes of the through holes, while the automatic system for locking the slide in descent, in particular the support part of the locking pin (l 'inside the support sleeve), has a complementary form of cooperation with the groove.
  • the barrel also includes in its interior a complementary form of cooperation with the groove of the slide to prevent the rotation of the slide in the stored position in the barrel, and in particular to allow the locking finger to always be in the axis of a through hole of the slide.
  • the forestay comprises a ratchet handling or maneuvering system for screwing and unscrewing the nut.
  • the ratchet operating system is integral with the lower end of the nut, opposite the slide, and comprises a ratchet screwing and unscrewing system and a maneuvering element such as an arm or a handle .
  • This ratchet operating system provides more torque and allows very efficient screwing and effortless unscrewing.
  • This choice of design also makes it possible to screw or unscrew the nut in a reduced angular zone, without making complete turns with the operating element, but by making round trips with the latter. This is an advantage in congested spaces, near a wall for example.
  • the nut operating system is a double pawl system which comprises a ratchet wheel whose inner circumference engages with the lower end of the nut, a double pawl part carrying two teeth and capable of being movable to position either tooth in cooperation with the ratchet wheel, and an operating arm to actuate the rotation of the ratchet wheel.
  • the operating arm is arranged opposite the double pawl part with respect to the ratchet wheel (diametrically opposed), and preferably, the operating arm is capable of pivoting (downwards or upwards ) around an axis perpendicular to the longitudinal axis of the forestay so as to be foldable and positioned at the desired angle.
  • the operating arm is as close as possible to the barrel, and the ratchet operating system thus becomes more compact.
  • the pivoting function of the arm the latter is positioned angularly, adapting to the workspace.
  • the ratchet wheel engages the lower end of the nut by being fixed thereto by welding.
  • the ratchet wheel and the double pawl part are arranged inside a closed body which comprises two windows from which are accessible two actuating surfaces allowing the double pawl part to be pivoted.
  • the forestay comprises at least one limit stop of the slide inside the shaft, in particular a stop which is fixed to the shaft (fixed to the inside of the upper end of the shaft ) and against which is adapted to cooperate an integral element of the slide to provide a limit switch deployment of the slide.
  • the forestay comprises two lower and upper plates, respectively secured to the barrel and to the slide, which comprise soles made of plastic material, in particular rubber, preferably the soles being removable.
  • the invention also relates to a method for implementing an aforementioned prop of the invention, the method comprising a step of deploying the slide to a desired height, a step of locking the slide via the introduction of the pin in a through hole, and optionally tightening the nut, characterized in that it comprises, after the step of deploying the slider and before the step of locking, a step of releasing the slider causing the locking of the slide via the automatic lowering blocking system of the slide, in particular the step of unfolding the slide being done with one hand, and the locking step can be done with the same hand.
  • the automatic blocking is achieved by the blocking finger automatically inserting itself into a through hole of the slide (the nearest hole being located immediately above the blocking finger at the when the slide is released), and the locking takes place by translating the pin in the through hole opposite the locking pin until it is forced out of the slide (and so as to absorb the vertical load) .
  • the folding of the slide is done automatically by pulling the pin out of the slide.
  • the term "height”, the qualifiers "upper”, “lower”, “high” and “low” of an element of the forestay are used in the context of a normal installation of the forestay, i.e. relating to a vertical notion in relation to the ground on which the forestay would be placed.
  • the forestay 1 of the invention illustrated in the figure 1 And 2 comprises a shaft 2 forming the lower part of the stay, a slider 3 capable of sliding in the shaft 2, forming the upper and telescopic part of the stay and comprising through holes 3' regularly distributed along the length of the slider, an automatic system 4 for temporarily blocking the slide 3 in descent once the latter is in the deployed position, a pin 5 for locking the slide 3 to prevent its descent into the position of use of the forestay, the pin 5 being able to cooperating with a through hole 3', a nut 6 with a function of fine adjustment of the height of the forestay, and an operating system 7 of the nut 6, capable of ensuring the screwing and unscrewing of the nut.
  • the automatic descent locking system 4 also forms an automatic system for indexing the spindle 5 systematically opposite a hole 3' of the slide 3.
  • Prop 1 is a mason's prop with all the robustness expected for this type of prop.
  • the automatic system 4 for temporarily blocking the slide 3 on the way down will be described later; it allows the slide 3 to be maneuvered with one hand, without needing the other hand to lock it in position. Indeed, by deploying the slide 3 upwards, when the user stops, the slide 3 is automatically locked in position without the possibility of descending; this temporary locking allows the user to use the same hand to grasp the pin 5 in order to lock the slide 3 in position.
  • the automatic system 4 for temporary locking incorporates the indexing function, the pin 5 is automatically opposite a hole 3', the user only has to translate the pin 5 horizontally (horizontal thrust) to lock the slide 3.
  • temporary is meant the fact that the sliding lock of the slide is not locked via pin 5.
  • the operating system 7 of the nut 6 illustrated in the example embodiment and detailed below with regard to the figure 7 is a ratchet operating system that provides ease of screwing and unscrewing by providing more torque.
  • the barrel 2 comprises a hollow tube 20, a lower plate 21 at the foot of the forestay and serving as a base for the forestay, and preferably, a foot reinforcement 22 of a type known per se by forming a double tube surrounding the forestay. lower end of tube 20.
  • the lower plate 21 advantageously comprises a sole 23 made of plastic material such as rubber.
  • the upper distal end of the tube 20 of the barrel 2, opposite the foot of the barrel, is threaded to receive the nut 6.
  • the nut 6 forms a simple tube 60 whose interior is threaded to cooperate with the threaded distal end of the barrel 2.
  • the screwing of the nut 6 is as usual, intended to slightly raise the slide 3 while the latter is locked in height by the pin 5 to refine the height of the forestay and put it completely in compression against the surface to be supported.
  • the operating system 7 of the nut 6 and its coupling with the slide 3 are described below.
  • the slide 3 comprises a hollow tube 30 which is able to slide in the hollow tube 20 of the barrel 2.
  • the tube 20 of the barrel 2 comprises inside it and at the level of its foot a limit stop 24 (visible on the figure 10 ) for the lower end of the slide 3.
  • the end stop 24 is for example a transverse axis to the barrel 2 and fixed by bolting at the level of the foot reinforcement 22.
  • the forestay comprises ( figures 10 and 11 ) an element 25 of the end of travel of the slide and a stop 26, to prevent the slide 3 from coming out of the barrel 2.
  • the element 25 of the end of the deployment run is a radial and projecting part of the tube 20 , its protrusion from the body of the slide is limited to allow the sliding of the slide 3 inside the tube 20.
  • the stop 26 is arranged at the upper and inner end of the tube 20 and is capable of blocking the slide in translation when the projecting part of the element 25 comes into contact against said stop 26.
  • the slide 3 comprises at the upper distal end of the tube 30 a so-called upper plate 31 which is intended for support.
  • the upper plate 31 comprises a sole 32 made of plastic material such as rubber.
  • the slide 3 comprises (notably visible on the figures 3 to 6 ) a plurality of regularly spaced through holes 3'.
  • the through holes 3' form diametrically opposed bores aligned along two diametrically opposed longitudinal axes, and extending along the height of the tube 30.
  • the pin 5 is intended to cooperate with a through hole 3' in a direction radial to the tube 30 to lock slide 3 in position. pin 5, crossing the entire diameter or the section of the slide 3, completely locks the slide 3 which does not risk coming down inadvertently.
  • Pin 5 is captive.
  • the pin 5 is integral with a ring 50 which surrounds the slide 3.
  • the pin 5 is carried by a support piece 40 which is part of the automatic system 4 of temporary blocking.
  • the automatic system 4 for temporarily blocking the slide 3 on the way down makes it possible to block the slide 3 temporarily as long as the pin 5 has not been installed in the locking position.
  • the automatic temporary blocking system 4 comprises the support piece 40 which surrounds the tube 30 of the slide 3 (and is free in translation), and a blocking member 41 which is capable of blocking the sliding of the tube 30 of the slide by relative to the support piece 40 (as long as the pin 5 is not arranged in the locking position).
  • the support piece 40 is therefore perforated in a circular manner in top view, and is capable of allowing the tube 30 of the slide 3 to slide through it.
  • the support piece 40 also has, at the lower end, a shoulder 42 so that the support piece 40 can rest on the barrel 2 or the nut 6 when the latter protrudes relative to the barrel 2 in the screwed position.
  • the support part 40 forms a sleeve and comprises in its wall a first orifice 40′ arranged radially in the wall, while the locking member 41 forms a locking finger which is adapted to be movable. to cooperate with the orifice 40' of the support part 40 and a hole 3' of the tube 30 of the slide 3 ( picture 3 ).
  • the blocking finger 41 is able to pivot around an axis orthogonal to the axis of the slide 3.
  • the blocking finger 41 is capable of adopting two positions, a so-called blocking position which corresponds to its engagement into a hole 3' from slide 3 ( picture 3 ), and a position called the extended position which corresponds to its disengagement from a hole 3' of the slide ( figure 5 ).
  • the locking pin 41 has a free end 41A for cooperating with the slide 3 and an opposite free end 41B, called gripping, facing the outside environment and capable of being gripped manually.
  • the locking finger 41 is able to pivot by pushing on its cooperation end 41A during the upward translation of the slide 3, or by pulling on its gripping end 41B, and is able to return to the free position by gravity.
  • the locking pin 41 is not coupled to any spring or elastic element.
  • the automatic locking system 4 preferably comprises a stirrup 43 ( figure 1 ) comprising a core 43A, and two facing opposite wings 43B and 43C, the locking finger 41 being secured to the core of the stirrup while the distal ends of the wings 43B and 43C of the stirrup are pivotally fixed to the support part 40.
  • the stirrup 43 is therefore capable of pivoting about an axis parallel to the core 43A of the stirrup.
  • the locking finger 41 is integral with the core 43A of the stirrup 43, and has its cooperation end 41A which projects orthogonally to the core 43A and towards the inside of the stirrup between the two wings 43B and 43C , and its gripping end 41B which protrudes oppositely towards the outside of the stirrup.
  • the pivoting of the locking finger 41 is ensured by the pivoting of the stirrup 43.
  • the locking finger 41 which is already disposed through the orifice 40' of the support part 40 is automatically introduced into the hole 3' of the nearest slide and is found as in the configuration of the picture 3 .
  • the cooperating end 41A of the locking finger 41 is advantageously beveled according to an inclination from top to bottom, which facilitates the immediate release of the locking finger during its pivoting, the bottom of the locking finger thus not risking abutting against the lower part of the 40' hole in the support part during pivoting ( figure 6 ).
  • the other advantage of the beveled shape is to facilitate the automatic disengagement of the finger from the holes 3' during the upward sliding of the slide, and its direct introduction into a hole when the sliding is stopped.
  • the locking finger 41 by its systematic cooperation with a through hole 3 'of the slide 3 constitutes an indexing means for the pin 5 to be introduced into this same through hole 3'.
  • the user does not have to think, as soon as the slide 3 is in a temporarily locked position, he knows that this position is the one required to directly insert the pin 5 and thus lock the slide 3.
  • the support part 40 carries the pin 5 by its free end 5' which is engaged in a radial tubular housing 44 projecting from the outside of the support part.
  • the tubular housing 44 communicates directly with a second radial orifice 44' of the support part 40, which is opposite the first radial orifice 40' accommodating the locking pin 41.
  • the pin 5 is systematically opposite a through hole 3 'of the slide 3.
  • the automatic locking system 4 by its locking finger 41 and by its support piece 40 which supports and prepositions the pin 5, constitutes an indexing means of the spindle 5 with respect to the through holes 3' of the slide 3.
  • tubular housing 44 which is radial imposes on the spindle 5 its orthogonal position with respect to the tube 30 of the slide, and therefore imposes a perfect position in vis-à-vis a through hole 3 'of the slide, while participating in the translation guidance of the spindle 5.
  • the user only has to push on the ring 50 in a horizontal direction to translate the pin 5 in the direction of the locking finger 41 until said locking finger 41 is pushed which then pivots outside the first radial orifice 40' of the support piece 40, allowing the pin 5 to pass entirely through the slide 3 ( figure 5 ) thus locking slide 3.
  • the automatic system 4 for temporarily locking the slide 3 on the way down, described above, comprising the support part 40 in the form of a sleeve provided with two opposite radial orifices, and the locking pin 41, has been given as an example. 'example.
  • support piece 40 of spindle 5 could comprise a top plate with an abutment surface downwards, while the ring of the spindle would be arranged under the top plate with its free end abutting against the abutment surface, thus preventing the slide from descending. This temporary blocking would then allow the translation of the pin to ensure locking.
  • this variant although providing temporary blocking of the slide, does not provide indexing for locking. Indeed, in the absence of the locking finger which cooperates with a through hole 3 'of the slide, this variant does not allow the slide to be blocked automatically so that the locking pin 5 can be directly opposite a hole crossing 3' of the slide.
  • the slide 3 comprises an anti-rotation system with respect to the support part 40, so that the locking pin 41 is always opposite the longitudinal axis of the through holes 3'.
  • a preferred embodiment of the anti-rotation system is illustrated in the figures 8 and 9 : by translating the support part 40 towards the upper plate 31 to visualize the interior and the underside of the support part 40, it is seen that the tube 30 of the slide 3 has a longitudinal groove 33 cooperating with a complementary shape 45 integral from the inside of the support part 40.
  • the inside of the tube 20 of the barrel 2 advantageously comprises a complementary shape 26 cooperating with the groove 33 of the slide 3 so as to prevent the rotation of the slide 3 in position row.
  • the operating system 7 of the nut 6 could be a pair of handles forming a pair of ears as in the prior art.
  • the operating system 7 of the nut 6 consists of a ratchet tightening and loosening system.
  • the ratchet operating system 7 is secured to the lower end 61 of the nut 6. It comprises in a body 70, preferably metallic, a ratchet wheel 71 fixed (preferably by welding) around the lower end 61 of the nut, a double ratchet part 72 comprising two spaced teeth 72A and 72B capable of cooperating selectively with the ratchet wheel 71, and outside the casing, an operating arm 73 for rotating the body 70.
  • the ratchet wheel 71 is located in a plane transverse to the nut 6.
  • the double pawl part 72 forms a pivoting part capable of being moved between two positions to cause one or the other of the teeth 72A to cooperate and 72B with the ratchet wheel 71 in order to control the direction of rotation of the ratchet wheel 71, and consequently tighten or loosen the nut 6.
  • the double part pawl 72 is pivotable about an axis 72' parallel to the longitudinal body of the nut 6.
  • the double pawl part 72 has two surfaces 72-1 and 72-2 accessible externally to the body 70 (via two windows 74-1 and 74-2 of body 70); the pivoting is done by pressing alternately on one or the other of the surfaces 72-1 and 72-2.
  • the operating arm 73 is foldable by being pivoted downwards and upwards, which reduces its size when not in use by being able to be folded vertically parallel to the forestay, and which facilitates its operation, in particular when the free space on the side of the forestay does not allow the arm 73 to be arranged completely horizontally.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

Etai (1) comportant un fût (2), une coulisse (3) apte à coulisser dans le fût (2) et comprenant des trous traversants répartis selon la longueur de la coulisse, une broche (5) de verrouillage, de préférence imperdable, destinée à être introduite dans un trou traversant pour verrouiller la coulisse (3) en position déployée, et un écrou (6) à fonction de fin de réglage de la hauteur de l'étai, caractérisé en ce qu'il comporte un système automatique (4) de blocage en descente de la coulisse (3), qui est apte à être mis en oeuvre automatiquement après déploiement de la coulisse et avant mise en place de la broche de verrouillage (5)Prop (1) comprising a shank (2), a slide (3) able to slide in the shank (2) and comprising through holes distributed along the length of the slide, a locking pin (5), preferably captive, intended to be introduced into a through hole to lock the slide (3) in the deployed position, and a nut (6) with the function of end of adjustment of the height of the forestay, characterized in that it comprises an automatic system ( 4) blocking the slide (3) in descent, which is able to be implemented automatically after deployment of the slide and before positioning of the locking pin (5)

Description

L'invention est relative à un étai, plus particulièrement un étai de maçon.The invention relates to a prop, more particularly a mason's prop.

Le terme étai dans la suite de la description s'entend par un étai de maçon, c'est-à-dire un étai qui présente toutes les performances de robustesse pour supporter un ouvrage, maintenir un élément en béton, une ossature, etc, contrairement à un étai ou une règle, qualifié de léger ou extensible qui vise à supporter de faibles charges du type au maximum 30 kg.The term prop in the rest of the description means a mason's prop, that is to say a prop which has all the robustness performances to support a work, maintain a concrete element, a frame, etc., unlike a stay or a rule, qualified as light or extensible which aims to support low loads of the type at most 30 kg.

De manière usuelle, un étai comporte un fût ou tube extérieur formant la partie inférieure de l'étai, une coulisse ou tube intérieur qui forme la partie supérieure de l'étai, qui est apte à coulisser dans le fût et qui comprend une pluralité de trous traversants espacés régulièrement, une broche ou goupille qui est le plus souvent imperdable et est destinée à traverser un trou traversant pour bloquer en translation la coulisse, et un écrou disposé sur la partie supérieure du fût pour assurer un réglage fin de la hauteur totale de l'étai et garantir une pression de serrage efficace. Généralement, l'écrou est doté d'une paire de poignées ou d'oreilles qui permettent de visser ou de dévisser l'écrou.Usually, a forestay comprises a barrel or outer tube forming the lower part of the forestay, a slider or inner tube which forms the upper part of the forestay, which is able to slide in the barrel and which comprises a plurality of regularly spaced through holes, a pin or pin which is most often captive and is intended to pass through a through hole to block the slide in translation, and a nut arranged on the upper part of the barrel to ensure fine adjustment of the total height of forestay and ensure effective clamping pressure. Typically, the nut has a pair of handles or lugs that allow the nut to be screwed in or out.

Cependant, un tel étai nécessite systématiquement l'utilisation de ses deux mains, d'une part, pour effectuer le verrouillage de la coulisse après son approche rapide contre la surface à étayer, l'une des mains maintenant en hauteur la coulisse tandis que l'autre main introduit la broche dans un trou traversant, et d'autre part, pour réaliser la finesse du serrage en tournant à deux mains les deux oreilles de l'écrou.However, such a prop systematically requires the use of both hands, on the one hand, to lock the slide after its rapid approach against the surface to be shored, one of the hands holding the slide aloft while the the other hand introduces the pin into a through hole, and on the other hand, to achieve the fineness of the tightening by turning the two ears of the nut with both hands.

L'invention a donc pour but de proposer un étai plus simple de fonctionnement, en particulier permettant sa mise en œuvre d'une seule main, et même de gagner en temps d'installation, tout en conservant sa robustesse.The object of the invention is therefore to propose a prop that is simpler to operate, in particular allowing it to be implemented with one hand, and even to save installation time, while retaining its robustness.

Selon l'invention, l'étai comporte un fût, une coulisse apte à coulisser dans le fût et comprenant des trous traversants répartis (régulièrement) selon la longueur de la coulisse, une broche de verrouillage, de préférence imperdable, destinée à être introduite dans un trou traversant pour verrouiller la coulisse en position déployée, et un écrou à fonction de réglage fin de la hauteur de l'étai, l'étai étant caractérisé en ce qu'il comporte un système automatique de blocage en descente de la coulisse, qui est apte à être mis en œuvre automatiquement après déploiement de la coulisse et avant mise en place de la broche de verrouillage.According to the invention, the forestay comprises a shaft, a slide able to slide in the shaft and comprising through holes distributed (regularly) along the length of the slide, a locking pin, preferably captive, intended to be introduced into a through hole for locking the slide in the deployed position, and a nut with adjustment function end of the height of the forestay, the forestay being characterized in that it comprises an automatic system for blocking the slide in descent, which is capable of being implemented automatically after deployment of the slide and before installation of the locking pin.

Ainsi, cette conception de l'étai permet une mise en œuvre d'une seule main, l'utilisateur n'ayant qu'à déployer la coulisse d'une seule main, et en relâchant la coulisse, celle-ci est automatiquement bloquée. L'utilisateur peut alors avec la même main, tandis que l'autre peut toujours être occupée, introduire la broche de verrouillage garantissant le blocage et le verrouillage en position de la coulisse, cette broche étant obligatoire pour la résistance à la charge de l'étai de maçon. Contrairement à l'art antérieur, l'utilisateur n'a plus besoin de ses deux mains pour mettre en place l'étai, ce qui peut grandement l'aider sur un chantier et lui permettre d'utiliser son autre main concomitamment pour une autre opération.Thus, this design of the stay allows implementation with one hand, the user having only to deploy the slide with one hand, and by releasing the slide, it is automatically blocked. The user can then with the same hand, while the other can still be occupied, introduce the locking pin guaranteeing the blocking and the locking in position of the slide, this pin being obligatory for the resistance to the load of the mason's prop. Unlike the prior art, the user no longer needs both hands to set up the prop, which can greatly help him on a construction site and allow him to use his other hand concomitantly for another operation.

Selon une caractéristique, le système automatique de blocage en descente comprend un doigt de blocage apte à être mobile, de préférence en pivotement (par rapport à un axe perpendiculaire à l'axe de coulisse), et apte à s'introduire automatiquement dans un trou traversant de la coulisse lors du relâchement de la coulisse sans traverser la section (le diamètre) de ladite coulisse, tandis que la coulisse comporte un moyen anti-rotation. Par conséquent, le doigt de blocage bloque provisoirement la coulisse en position, et comme il ne traverse pas la section de la coulisse, il est très facile à l'utilisateur de poursuivre si besoin le déploiement de la coulisse du fait de la mobilité du doigt et d'assurer un blocage automatique dans un autre trou puisque la coulisse ne peut pas tourner.According to one characteristic, the automatic lowering blocking system comprises a blocking finger capable of being movable, preferably pivoting (relative to an axis perpendicular to the slide axis), and capable of being introduced automatically into a hole crossing the slide when releasing the slide without crossing the section (the diameter) of said slide, while the slide includes an anti-rotation means. Consequently, the blocking finger temporarily blocks the slide in position, and since it does not cross the section of the slide, it is very easy for the user to continue the deployment of the slide if necessary due to the mobility of the finger. and to ensure automatic blocking in another hole since the slide cannot rotate.

Dans un exemple préféré de réalisation, le système automatique de blocage en descente comporte une pièce de support qui porte la broche et un doigt de blocage apte à pivoter, la pièce étant en forme de douille en entourant la coulisse et en reposant sur le fût ou l'écrou, et étant dotée d'un premier orifice radial dans lequel est engagé le doigt de blocage et d'un second orifice radial opposé dans lequel est apte à être introduit la broche. De préférence, le second orifice radial est en communication avec un logement tubulaire radial qui porte la broche ; le logement tubulaire procure notamment une fonction de guidage pour la translation de la broche dans un plan parfaitement orthogonal à la direction de la coulisse.In a preferred exemplary embodiment, the automatic lowering blocking system comprises a support part which carries the pin and a blocking finger capable of pivoting, the part being in the form of a sleeve surrounding the slide and resting on the shaft or the nut, and being provided with a first radial orifice in which the locking finger is engaged and with a second opposite radial orifice in which the pin is adapted to be introduced. Preferably, the second radial orifice is in communication with a radial tubular housing which carries the pin; the tubular housing provides in particular a guiding function for the translation of the pin in a plane perfectly orthogonal to the direction of the slide.

Selon une autre caractéristique, le doigt de blocage est en position libre par gravité. Le système est ainsi simple de fabrication, en étant en particulier exempt de moyen élastique du type ressort. En position libre, le doigt de blocage est apte à buter contre la coulisse lors de son déploiement ; c'est lorsque le doigt de blocage rencontre un trou de la coulisse, qu'il s'introduit automatiquement dedans.According to another characteristic, the locking finger is in the free position by gravity. The system is thus simple to manufacture, in particular being free of elastic means of the spring type. In the free position, the locking finger is able to abut against the slide during its deployment; it is when the locking finger encounters a hole in the slide that it is automatically inserted into it.

Avantageusement, le doigt de blocage constitue en outre un système automatique d'indexation pour l'introduction de la broche. De préférence, la broche est agencée de manière fixe en position hors verrouillage (par un moyen de support adapté) de façon à être en vis-à-vis radialement du doigt de blocage. De cette manière, la broche est systématiquement déjà en position d'engagement devant un trou traversant car la position de verrouillage est déjà indexée du fait de l'indexation effectuée par le doigt de blocage en position dans un trou de la coulisse. L'utilisateur n'a pas à réfléchir, la coulisse étant bloquée en position au niveau d'un trou traversant, la broche pourra être introduite directement en face du trou traversant accueillant à l'opposé le doigt de blocage. L'utilisateur n'a qu'à translater la broche dans le trou traversant (en particulier par une simple poussée), et le verrouillage est réalisé de manière extrêmement rapide. Comme le doigt de blocage est mobile, la broche en étant translatée poussera sans effort le doigt de blocage, le chassant hors du trou pour traverser totalement la section de la coulisse.Advantageously, the blocking finger also constitutes an automatic indexing system for the introduction of the pin. Preferably, the pin is arranged in a fixed manner in the non-locking position (by suitable support means) so as to be radially opposite the locking finger. In this way, the spindle is systematically already in the engagement position in front of a through hole because the locking position is already indexed due to the indexing performed by the locking finger in position in a hole of the slide. The user does not have to think, the slide being locked in position at the level of a through hole, the pin can be introduced directly opposite the through hole receiving the opposite blocking finger. The user only has to translate the pin in the through hole (in particular by a simple push), and locking is achieved extremely quickly. As the locking pin is movable, the spindle being translated will effortlessly push the locking pin, pushing it out of the hole to completely cross the section of the slide.

De plus, le fait que la broche soit agencée de manière fixe en position hors verrouillage de façon à être en vis-à-vis radialement du doigt de blocage, permet de répartir les efforts s'exerçant sur l'étai en position de soutènement, et ainsi de ne pas risquer de déformer le doigt de blocage.In addition, the fact that the pin is arranged in a fixed manner in the non-locking position so as to be radially opposite the locking finger, makes it possible to distribute the forces exerted on the forestay in the support position, and thus not to risk deforming the locking finger.

Selon une autre caractéristique, le doigt de blocage est mobile en pivotement (par rapport à un axe perpendiculaire à la direction longitudinale de l'étai) et comporte une extension de préhension qui est disposée à l'opposé de la coulisse (en regard de l'environnement extérieur), permettant de soulever (manuellement) en pivotement le doigt de blocage. Il est ainsi très simple de dégager le doigt de blocage si l'utilisateur souhaite faire redescendre la coulisse lorsque la broche de verrouillage n'a pas été mise en place. En outre, en déverrouillant la coulisse, c'est-à-dire en sortant la broche du trou traversant, le doigt de blocage étant en dehors de la coulisse, par le poids de la coulisse, celle-ci redescend immédiatement en position rangée dans le fût de l'étai.According to another characteristic, the locking finger is movable in pivoting (relative to an axis perpendicular to the longitudinal direction of the forestay) and comprises a gripping extension which is arranged opposite the slide (facing the external environment), allowing the locking pin to be lifted (manually) by pivoting. It is thus very simple to disengage the locking pin if the user wishes to lower the slide when the locking pin has not been put in place. In addition, by unlocking the slide, that is to say by removing the pin from the through hole, the locking pin being outside the slide, by the weight of the slide, the latter immediately descends into the stowed position in the forestay shaft.

Selon encore une autre caractéristique, la coulisse comporte un moyen anti-rotation par rapport au système automatique de blocage en descente de la coulisse, en particulier la coulisse comporte une rainure longitudinale qui est ménagée dans la paroi de la coulisse en étant décalée par rapport aux axes longitudinaux des trous traversants, tandis que le système automatique de blocage en descente de la coulisse, en particulier la pièce support du doigt de blocage (l'intérieur de la douille de support), comporte une forme complémentaire de coopération avec la rainure. Avantageusement, le fût comporte également en son intérieur une forme complémentaire de coopération avec la rainure de la coulisse pour éviter la rotation de la coulisse en position rangée dans le fût, et en particulier pour permettre au doigt de blocage de se trouver toujours dans l'axe d'un trou traversant de la coulisse.According to yet another characteristic, the slide includes an anti-rotation means with respect to the automatic system for blocking the slide in descent, in particular the slide has a longitudinal groove which is formed in the wall of the slide, being offset with respect to the longitudinal axes of the through holes, while the automatic system for locking the slide in descent, in particular the support part of the locking pin (l 'inside the support sleeve), has a complementary form of cooperation with the groove. Advantageously, the barrel also includes in its interior a complementary form of cooperation with the groove of the slide to prevent the rotation of the slide in the stored position in the barrel, and in particular to allow the locking finger to always be in the axis of a through hole of the slide.

Selon encore une autre caractéristique, l'étai comporte un système de manipulation ou manœuvre à cliquet pour visser et dévisser l'écrou. Le système de manœuvre à cliquet est solidaire de l'extrémité inférieure de l'écrou, à l'opposé de la coulisse, et comprend un système de vissage et de dévissage à cliquet et un élément de manœuvre tel qu'un bras ou une poignée. Ce système de manœuvre à cliquet procure plus de couple et permet de visser de manière très efficace et de dévisser sans effort. Ce choix de conception permet aussi de visser ou dévisser l'écrou dans une zone angulaire réduite, sans effectuer de tours complets avec l'élément de manœuvre, mais en réalisant des allers-retours avec celui-ci. C'est un avantage dans des espaces encombrés, près d'un mur par exemple.According to yet another characteristic, the forestay comprises a ratchet handling or maneuvering system for screwing and unscrewing the nut. The ratchet operating system is integral with the lower end of the nut, opposite the slide, and comprises a ratchet screwing and unscrewing system and a maneuvering element such as an arm or a handle . This ratchet operating system provides more torque and allows very efficient screwing and effortless unscrewing. This choice of design also makes it possible to screw or unscrew the nut in a reduced angular zone, without making complete turns with the operating element, but by making round trips with the latter. This is an advantage in congested spaces, near a wall for example.

Avantageusement, le système de manœuvre de l'écrou est un système à double cliquet qui comporte une roue à rochet dont la circonférence intérieure est en prise avec l'extrémité inférieure de l'écrou, une pièce à double cliquet portant deux dents et apte à être mobile pour positionner l'une ou l'autre dent en coopération avec la roue à rochet, et un bras de manœuvre pour actionner la rotation de la roue à rochet.Advantageously, the nut operating system is a double pawl system which comprises a ratchet wheel whose inner circumference engages with the lower end of the nut, a double pawl part carrying two teeth and capable of being movable to position either tooth in cooperation with the ratchet wheel, and an operating arm to actuate the rotation of the ratchet wheel.

Avantageusement, le bras de manœuvre est agencé à l'opposé de la pièce à double cliquet par rapport à la roue à rochet (diamétralement opposé), et de préférence, le bras de manœuvre est apte à pivoter (vers le bas ou vers le haut) autour d'un axe perpendiculaire à l'axe longitudinal de l'étai de sorte à être rabattable et positionné selon l'angle souhaité. De cette façon, le bras de manœuvre est au plus près du fût, et le système de manœuvre à cliquet gagne ainsi en compacité. De plus, avec la fonction pivotante du bras, ce dernier est positionné angulairement en s'adaptant à l'espace de travail.Advantageously, the operating arm is arranged opposite the double pawl part with respect to the ratchet wheel (diametrically opposed), and preferably, the operating arm is capable of pivoting (downwards or upwards ) around an axis perpendicular to the longitudinal axis of the forestay so as to be foldable and positioned at the desired angle. In this way, the operating arm is as close as possible to the barrel, and the ratchet operating system thus becomes more compact. In addition, with the pivoting function of the arm, the latter is positioned angularly, adapting to the workspace.

De préférence, la roue à rochet est en prise avec l'extrémité inférieure de l'écrou en y étant fixée par soudage.Preferably, the ratchet wheel engages the lower end of the nut by being fixed thereto by welding.

De préférence, la roue à rochet et la pièce à double cliquet sont disposées à l'intérieur d'un corps fermé qui comporte deux fenêtres depuis lesquelles sont accessibles deux surfaces d'actionnement permettant de faire pivoter la pièce à double cliquet.Preferably, the ratchet wheel and the double pawl part are arranged inside a closed body which comprises two windows from which are accessible two actuating surfaces allowing the double pawl part to be pivoted.

Selon encore une autre caractéristique, l'étai comporte au moins une butée de fin de course de la coulisse à l'intérieur du fût, en particulier une butée qui est solidaire du fût (solidaire de l'intérieur de l'extrémité supérieure du fût) et contre laquelle est apte à coopérer un élément solidaire de la coulisse pour assurer une fin de course de déploiement de la coulisse.According to yet another characteristic, the forestay comprises at least one limit stop of the slide inside the shaft, in particular a stop which is fixed to the shaft (fixed to the inside of the upper end of the shaft ) and against which is adapted to cooperate an integral element of the slide to provide a limit switch deployment of the slide.

Selon encore une autre caractéristique, l'étai comporte deux platines inférieure et supérieure, respectivement solidaires du fût et de la coulisse, qui comportent des semelles en matière plastique, notamment en caoutchouc, de préférence les semelles étant amovibles.According to yet another characteristic, the forestay comprises two lower and upper plates, respectively secured to the barrel and to the slide, which comprise soles made of plastic material, in particular rubber, preferably the soles being removable.

L'invention porte également sur un procédé de mise en œuvre d'un étai précité de l'invention, le procédé comportant une étape de déploiement de la coulisse jusqu'à une hauteur voulue, une étape de verrouillage de la coulisse via l'introduction de la broche dans un trou traversant, et éventuellement serrage de l'écrou, caractérisé en ce qu'il comporte après l'étape de déploiement de la coulisse et avant l'étape de verrouillage, une étape de relâchement de la coulisse engendrant le blocage automatique de la coulisse via le système automatique de blocage en descente de la coulisse, en particulier l'étape de déploiement de la coulisse se faisant d'une seule main, et l'étape de verrouillage pouvant se faire avec la même main.The invention also relates to a method for implementing an aforementioned prop of the invention, the method comprising a step of deploying the slide to a desired height, a step of locking the slide via the introduction of the pin in a through hole, and optionally tightening the nut, characterized in that it comprises, after the step of deploying the slider and before the step of locking, a step of releasing the slider causing the locking of the slide via the automatic lowering blocking system of the slide, in particular the step of unfolding the slide being done with one hand, and the locking step can be done with the same hand.

Dans le mode de réalisation préféré du système automatique de blocage, le blocage automatique est réalisé par le doigt de blocage s'introduisant automatiquement dans un trou traversant de la coulisse (le trou le plus proche se situant immédiatement au-dessus du doigt de blocage au moment du relâchement de la coulisse), et le verrouillage s'effectuant en translatant la broche dans le trou traversant à l'opposé du doigt de blocage jusqu'à le chasser en dehors de la coulisse (et de manière à absorber la charge verticale).In the preferred embodiment of the automatic blocking system, the automatic blocking is achieved by the blocking finger automatically inserting itself into a through hole of the slide (the nearest hole being located immediately above the blocking finger at the when the slide is released), and the locking takes place by translating the pin in the through hole opposite the locking pin until it is forced out of the slide (and so as to absorb the vertical load) .

Le repliement de la coulisse se fait automatiquement en sortant la broche en dehors de la coulisse.The folding of the slide is done automatically by pulling the pin out of the slide.

Dans la suite de la description le terme de « hauteur », les qualificatifs « supérieur », « inférieur », « haut » et « bas » d'un élément de l'étai sont utilisés dans le cadre d'une installation normale de l'étai, c'est-à-dire relatif à une notion verticale par rapport à un sol sur lequel serait posé l'étai.In the remainder of the description, the term "height", the qualifiers "upper", "lower", "high" and "low" of an element of the forestay are used in the context of a normal installation of the forestay, i.e. relating to a vertical notion in relation to the ground on which the forestay would be placed.

Des caractéristiques et autres avantages de l'invention apparaîtront à la lecture de la description qui va suivre, donné uniquement à titre d'exemple non limitatif, et faite en référence aux dessins annexés et sur lesquels :

  • [Fig. 1] ou figure 1 représente une vue en perspective d'un mode de réalisation préféré d'un étai selon l'invention en position totalement rangée de la coulisse.
  • [Fig. 2] ou figure 2 représente une vue de côté de l'étai de la figure 1, en position déployée et bloquée de la coulisse, et avant verrouillage.
  • [Fig. 3] ou figure 3 est une vue en coupe verticale partielle de l'étai de la figure 1, montrant la position bloquée de la coulisse grâce au système automatique de blocage en descente de la coulisse, la coopération du système automatique de blocage avec la coulisse lorsque cette dernière est en position déployée étant la même.
  • [Fig. 4] ou figure 4 représente une vue de côté de l'étai de la figure 1 en position déployée et verrouillée de la coulisse.
  • [Fig. 5] ou figure 5 correspond à une vue en coupe verticale partielle de l'étai de la figure 4 selon un plan médian vertical passant par les trous traversants.
  • [Fig. 6] ou figure 6 correspond à la vue en coupe verticale et partielle de l'étai au cours du déploiement de la coulisse et avant blocage de la coulisse.
  • [Fig. 7] ou figure 7 est une vue en coupe selon le plan médian horizontal du système de manœuvre à cliquet de l'écrou.
  • [Fig. 8] ou figure 8 est une vue en perspective en position déployée de la coulisse et avec le système automatique de blocage en descente de la coulisse qui a été translatée volontairement pour visualiser l'écrou en vue plongeante.
  • [Fig. 9] ou figure 9 correspond à une vue penchée de la figure 8 pour visualiser en perspective plongeante le dessous du système automatique de blocage en descente de la coulisse.
  • [Fig. 10] ou figure 10 est une vue en coupe du pied de l'étai en position repliée de la coulisse, et montrant la butée basse de fin de course pour la coulisse.
  • [Fig. 11] ou figure 11 est une vue en coupe de l'extrémité supérieure du fût de l'étai en position totalement déployée de la coulisse, et montrant la butée haute de fin de course pour la coulisse.
Characteristics and other advantages of the invention will become apparent on reading the following description, given solely by way of non-limiting example, and made with reference to the appended drawings and in which:
  • [ Fig. 1] or figure 1 shows a perspective view of a preferred embodiment of a strut according to the invention in the fully stowed position of the slide.
  • [ Fig. 2] or figure 2 shows a side view of the forestay of the figure 1 , in the deployed and locked position of the slide, and before locking.
  • [ Fig. 3] or figure 3 is a partial vertical sectional view of the forestay of the figure 1 , showing the blocked position of the slide thanks to the automatic system for blocking the slide in descent, the cooperation of the automatic blocking system with the slide when the latter is in the deployed position being the same.
  • [ Fig. 4] or figure 4 shows a side view of the forestay of the figure 1 in the extended and locked position of the slide.
  • [ Fig. 5] or figure 5 corresponds to a partial vertical sectional view of the forestay of the figure 4 along a vertical median plane passing through the through holes.
  • [ Fig. 6] or figure 6 corresponds to the view in vertical and partial section of the forestay during the extension of the slide and before locking the slide.
  • [ Fig. 7] or figure 7 is a sectional view along the horizontal median plane of the nut's ratchet operating system.
  • [ Fig. 8] or figure 8 is a perspective view in the deployed position of the slide and with the automatic lowering blocking system of the slide which has been voluntarily translated to visualize the nut in a bird's eye view.
  • [ Fig. 9] or figure 9 corresponds to a leaning view of the figure 8 to visualize in a bird's-eye perspective the underside of the automatic lowering blocking system of the slide.
  • [ Fig. 10] or figure 10 is a cross-sectional view of the foot of the forestay in the folded position of the slide, and showing the lower limit stop for the slide.
  • [ Fig. 11] or figure 11 is a sectional view of the upper end of the stay barrel in the fully extended position of the slide, and showing the upper limit stop for the slide.

L'étai 1 de l'invention illustré sur les figures 1 et 2 comporte un fût 2 formant la partie inférieure de l'étai, une coulisse 3 apte à coulisser dans le fût 2, formant la partie supérieure et télescopique de l'étai et comprenant des trous traversants 3' régulièrement répartis selon la longueur de la coulisse, un système automatique 4 de blocage provisoire en descente de la coulisse 3 une fois cette dernière en position déployée, une broche 5 de verrouillage de la coulisse 3 pour empêcher sa descente en position d'utilisation de l'étai, la broche 5 étant apte à coopérer avec un trou traversant 3', un écrou 6 à fonction de réglage fin de la hauteur de l'étai, et un système de manoeuvre 7 de l'écrou 6, apte à assurer le vissage et le dévissage de l'écrou. De préférence, le système automatique 4 de blocage en descente forme en outre un système automatique d'indexation de la broche 5 en face systématiquement d'un trou 3' de la coulisse 3.The forestay 1 of the invention illustrated in the figure 1 And 2 comprises a shaft 2 forming the lower part of the stay, a slider 3 capable of sliding in the shaft 2, forming the upper and telescopic part of the stay and comprising through holes 3' regularly distributed along the length of the slider, an automatic system 4 for temporarily blocking the slide 3 in descent once the latter is in the deployed position, a pin 5 for locking the slide 3 to prevent its descent into the position of use of the forestay, the pin 5 being able to cooperating with a through hole 3', a nut 6 with a function of fine adjustment of the height of the forestay, and an operating system 7 of the nut 6, capable of ensuring the screwing and unscrewing of the nut. Preferably, the automatic descent locking system 4 also forms an automatic system for indexing the spindle 5 systematically opposite a hole 3' of the slide 3.

L'étai 1 est un étai de maçon avec toute la robustesse attendue pour ce type d'étai.Prop 1 is a mason's prop with all the robustness expected for this type of prop.

Le système automatique 4 de blocage provisoire en descente de la coulisse 3 sera décrit plus loin ; il permet de manœuvrer la coulisse 3 d'une seule main, sans avoir besoin de l'autre main pour la verrouiller en position. En effet, en déployant la coulisse 3 vers le haut, lorsque l'utilisateur s'arrête, la coulisse 3 est automatiquement bloquée en position sans possibilité de redescendre ; ce blocage provisoire permet à l'utilisateur de se servir de la même main pour se saisir de la broche 5 afin de verrouiller en position la coulisse 3. De plus, lorsque le système automatique 4 de blocage provisoire intègre la fonction d'indexation, la broche 5 est automatiquement en vis-à-vis d'un trou 3', l'utilisateur n'a qu'à translater horizontalement (poussée horizontale) la broche 5 pour verrouiller la coulisse 3. On entend par « provisoire », le fait que le blocage en coulissement de la coulisse n'est pas verrouillé via la broche 5.The automatic system 4 for temporarily blocking the slide 3 on the way down will be described later; it allows the slide 3 to be maneuvered with one hand, without needing the other hand to lock it in position. Indeed, by deploying the slide 3 upwards, when the user stops, the slide 3 is automatically locked in position without the possibility of descending; this temporary locking allows the user to use the same hand to grasp the pin 5 in order to lock the slide 3 in position. In addition, when the automatic system 4 for temporary locking incorporates the indexing function, the pin 5 is automatically opposite a hole 3', the user only has to translate the pin 5 horizontally (horizontal thrust) to lock the slide 3. By "temporary" is meant the fact that the sliding lock of the slide is not locked via pin 5.

Par ailleurs, le système de manoeuvre 7 de l'écrou 6 illustré dans l'exemple de réalisation et détaillé plus loin en regard de la figure 7, est un système de manoeuvre à cliquet qui procure une facilité de vissage et de dévissage en fournissant davantage de couple.Furthermore, the operating system 7 of the nut 6 illustrated in the example embodiment and detailed below with regard to the figure 7 , is a ratchet operating system that provides ease of screwing and unscrewing by providing more torque.

Le fût 2 comporte un tube 20 creux, une platine inférieure 21 au pied de l'étai et servant d'embase à l'étai, et de préférence, un renfort de pied 22 de type connu en soi en formant un double tube entourant l'extrémité inférieure du tube 20.The barrel 2 comprises a hollow tube 20, a lower plate 21 at the foot of the forestay and serving as a base for the forestay, and preferably, a foot reinforcement 22 of a type known per se by forming a double tube surrounding the forestay. lower end of tube 20.

La platine inférieure 21 comporte avantageusement une semelle 23 en matière plastique tel qu'en caoutchouc.The lower plate 21 advantageously comprises a sole 23 made of plastic material such as rubber.

Comme montré sur la figure 3, l'extrémité distale supérieure du tube 20 du fût 2, à l'opposé du pied du fût, est filetée pour recevoir l'écrou 6. L'écrou 6 forme un simple tube 60 dont l'intérieur est taraudé pour coopérer avec l'extrémité distale filetée du fût 2. Le vissage de l'écrou 6 est comme usuellement, destiné à surélever légèrement la coulisse 3 alors que celle-ci est verrouillée en hauteur par la broche 5 pour affiner la hauteur de l'étai et le mettre complètement en compression contre la surface à soutenir. Le système de manoeuvre 7 de l'écrou 6 et son couplage avec la coulisse 3 sont décrits plus loin.As shown on the picture 3 , the upper distal end of the tube 20 of the barrel 2, opposite the foot of the barrel, is threaded to receive the nut 6. The nut 6 forms a simple tube 60 whose interior is threaded to cooperate with the threaded distal end of the barrel 2. The screwing of the nut 6 is as usual, intended to slightly raise the slide 3 while the latter is locked in height by the pin 5 to refine the height of the forestay and put it completely in compression against the surface to be supported. The operating system 7 of the nut 6 and its coupling with the slide 3 are described below.

La coulisse 3 comporte un tube 30 creux qui est apte à coulisser dans le tube creux 20 du fût 2. Le tube 20 du fût 2 comporte en son intérieur et au niveau de son pied une butée de fin de course 24 (visible sur la figure 10) pour l'extrémité inférieure de la coulisse 3. La butée de fin de course 24 est par exemple un axe transversal au fût 2 et fixé par boulonnage au niveau du renfort de pied 22. En outre, l'étai comporte (figures 10 et 11) un élément 25 de fin de course de déploiement de la coulisse et une butée 26, pour éviter à la coulisse 3 de sortir du fût 2. L'élément 25 de fin de course de déploiement est une pièce radiale et en saillie du tube 20, son dépassement du corps de la coulisse est limité pour permettre le coulissement de la coulisse 3 à l'intérieur du tube 20. La butée 26 est disposée à l'extrémité supérieure et intérieure du tube 20 et est apte à bloquer la coulisse en translation lorsque la partie en saillie de l'élément 25 arrive en contact contre ladite butée 26.The slide 3 comprises a hollow tube 30 which is able to slide in the hollow tube 20 of the barrel 2. The tube 20 of the barrel 2 comprises inside it and at the level of its foot a limit stop 24 (visible on the figure 10 ) for the lower end of the slide 3. The end stop 24 is for example a transverse axis to the barrel 2 and fixed by bolting at the level of the foot reinforcement 22. In addition, the forestay comprises ( figures 10 and 11 ) an element 25 of the end of travel of the slide and a stop 26, to prevent the slide 3 from coming out of the barrel 2. The element 25 of the end of the deployment run is a radial and projecting part of the tube 20 , its protrusion from the body of the slide is limited to allow the sliding of the slide 3 inside the tube 20. The stop 26 is arranged at the upper and inner end of the tube 20 and is capable of blocking the slide in translation when the projecting part of the element 25 comes into contact against said stop 26.

La coulisse 3 comporte en l'extrémité distale supérieure du tube 30 une platine 31 dite supérieure qui est destinée au soutènement. De préférence, la platine supérieure 31 comprend une semelle 32 en matière plastique tel qu'en caoutchouc.The slide 3 comprises at the upper distal end of the tube 30 a so-called upper plate 31 which is intended for support. Preferably, the upper plate 31 comprises a sole 32 made of plastic material such as rubber.

De plus, la coulisse 3 comprend (notamment visibles sur les figures 3 à 6) une pluralité de trous traversants 3' espacés régulièrement. Les trous traversants 3' forment des alésages diamétralement opposés et alignés selon deux axes longitudinaux diamétralement opposés, et s'étendant selon la hauteur du tube 30. La broche 5 est destinée à coopérer avec un trou traversant 3' selon une direction radiale au tube 30 pour bloquer en position la coulisse 3. La broche 5, en traversant tout le diamètre ou la section de la coulisse 3, verrouille totalement la coulisse 3 qui ne risque pas de redescendre de manière intempestive.In addition, the slide 3 comprises (notably visible on the figures 3 to 6 ) a plurality of regularly spaced through holes 3'. The through holes 3' form diametrically opposed bores aligned along two diametrically opposed longitudinal axes, and extending along the height of the tube 30. The pin 5 is intended to cooperate with a through hole 3' in a direction radial to the tube 30 to lock slide 3 in position. pin 5, crossing the entire diameter or the section of the slide 3, completely locks the slide 3 which does not risk coming down inadvertently.

La broche 5 est imperdable. La broche 5 est solidaire d'un anneau 50 qui entoure la coulisse 3. De plus, la broche 5 est portée par une pièce de support 40 qui fait partie du système automatique 4 de blocage provisoire.Pin 5 is captive. The pin 5 is integral with a ring 50 which surrounds the slide 3. In addition, the pin 5 is carried by a support piece 40 which is part of the automatic system 4 of temporary blocking.

Le système automatique 4 de blocage provisoire en descente de la coulisse 3 permet de bloquer provisoirement la coulisse 3 tant que la broche 5 n'a pas été installée en position de verrouillage. Le système automatique 4 de blocage provisoire comporte la pièce de support 40 qui entoure le tube 30 de la coulisse 3 (et est libre en translation), et un organe de blocage 41 qui est apte à bloquer le coulissement du tube 30 de la coulisse par rapport à la pièce de support 40 (tant que la broche 5 n'est pas agencée en position de verrouillage). La pièce de support 40 est donc trouée de manière circulaire en vue de dessus, et est apte à laisser coulisser à travers elle le tube 30 de la coulisse 3. La pièce de support 40 présente en outre en extrémité inférieure, un épaulement 42 de façon que la pièce de support 40 puisse reposer sur le fût 2 ou l'écrou 6 lorsque ce dernier fait saillie par rapport au fût 2 en position vissée.The automatic system 4 for temporarily blocking the slide 3 on the way down makes it possible to block the slide 3 temporarily as long as the pin 5 has not been installed in the locking position. The automatic temporary blocking system 4 comprises the support piece 40 which surrounds the tube 30 of the slide 3 (and is free in translation), and a blocking member 41 which is capable of blocking the sliding of the tube 30 of the slide by relative to the support piece 40 (as long as the pin 5 is not arranged in the locking position). The support piece 40 is therefore perforated in a circular manner in top view, and is capable of allowing the tube 30 of the slide 3 to slide through it. The support piece 40 also has, at the lower end, a shoulder 42 so that the support piece 40 can rest on the barrel 2 or the nut 6 when the latter protrudes relative to the barrel 2 in the screwed position.

Dans l'exemple préféré illustré, la pièce de support 40 forme une douille et comprend dans sa paroi un premier orifice 40' agencé radialement dans la paroi, tandis que l'organe de blocage 41 forme un doigt de blocage qui est apte à être mobile pour coopérer avec l'orifice 40' de la pièce de support 40 et un trou 3' du tube 30 de la coulisse 3 (figure 3). Le doigt de blocage 41 est mobile en pivotement autour d'un axe orthogonal à l'axe de la coulisse 3. Le doigt de blocage 41 est apte à adopter deux positions, une position dite de blocage qui correspond à son engagement jusque dans un trou 3' de la coulisse 3 (figure 3), et une position dite position sortie qui correspond à son désengagement d'un trou 3' de la coulisse (figure 5). Lorsque la broche 5 n'est pas dans sa position de verrouillage, c'est-à-dire totalement traversante par rapport à la coulisse 3 à travers un trou traversant 3', et que le doigt de blocage 41 adopte une position libre par sa simple gravité, ledit doigt de blocage 41 est systématiquement agencé à travers l'orifice 40' de la pièce de support 40 (figures 3 et 6). Au cours du déploiement de la coulisse 3, le doigt de blocage 41 passe alternativement devant un trou 3' de la coulisse et devant la paroi du tube 30 en butant contre celle-ci (figure 6). Ainsi, lorsque la coulisse 3 est relâchée, le doigt de blocage 41 s'introduit automatiquement dans le trou traversant 3' immédiatement le plus proche bloquant provisoirement en translation la coulisse.In the preferred example illustrated, the support part 40 forms a sleeve and comprises in its wall a first orifice 40′ arranged radially in the wall, while the locking member 41 forms a locking finger which is adapted to be movable. to cooperate with the orifice 40' of the support part 40 and a hole 3' of the tube 30 of the slide 3 ( picture 3 ). The blocking finger 41 is able to pivot around an axis orthogonal to the axis of the slide 3. The blocking finger 41 is capable of adopting two positions, a so-called blocking position which corresponds to its engagement into a hole 3' from slide 3 ( picture 3 ), and a position called the extended position which corresponds to its disengagement from a hole 3' of the slide ( figure 5 ). When the pin 5 is not in its locking position, that is to say completely through with respect to the slide 3 through a through hole 3 ', and the locking finger 41 adopts a free position by its simple gravity, said locking finger 41 is systematically arranged through the orifice 40' of the support part 40 ( figure 3 And 6 ). During the deployment of the slide 3, the locking pin 41 passes alternately in front of a hole 3 'of the slide and in front of the wall of the tube 30 by abutting against the latter ( figure 6 ). Thus, when the slide 3 is released, the locking finger 41 is automatically introduced into the through hole 3 'immediately closest temporarily blocking the slide in translation.

Le doigt de blocage 41 présente une extrémité libre 41A de coopération avec la coulisse 3 et une extrémité libre opposée 41B, dite de préhension, en regard de l'environnement extérieur et apte à être saisie manuellement. Le doigt de blocage 41 est apte à pivoter par poussée sur son extrémité de coopération 41A lors de la translation vers le haut de la coulisse 3, ou par traction sur son extrémité de préhension 41B, et est apte à revenir en position libre par gravité. Le doigt de blocage 41 n'est couplé à aucun ressort ou élément élastique.The locking pin 41 has a free end 41A for cooperating with the slide 3 and an opposite free end 41B, called gripping, facing the outside environment and capable of being gripped manually. The locking finger 41 is able to pivot by pushing on its cooperation end 41A during the upward translation of the slide 3, or by pulling on its gripping end 41B, and is able to return to the free position by gravity. The locking pin 41 is not coupled to any spring or elastic element.

Pour assurer le pivotement du doigt de blocage 41, le système automatique 4 de blocage comporte de préférence un étrier 43 (figure 1) comprenant une âme 43A, et deux ailes opposées en regard 43B et 43C, le doigt de blocage 41 étant solidaire de l'âme de l'étrier tandis que les extrémités distales des ailes 43B et 43C de l'étrier sont fixées en pivotement à la pièce de support 40. L'étrier 43 est donc apte à pivoter autour d'un axe parallèle à l'âme 43A de l'étrier. Le doigt de blocage 41 est solidaire de l'âme 43A de l'étrier 43, et présente son extrémité de coopération 41A qui fait saillie orthogonalement à l'âme 43A et vers l'intérieur de l'étrier entre les deux ailes 43B et 43C, et son extrémité de préhension 41B qui fait saillie de manière opposée vers l'extérieur de l'étrier. Ainsi, le pivotement du doigt de blocage 41 est assuré par le pivotement de l'étrier 43.To ensure the pivoting of the locking finger 41, the automatic locking system 4 preferably comprises a stirrup 43 ( figure 1 ) comprising a core 43A, and two facing opposite wings 43B and 43C, the locking finger 41 being secured to the core of the stirrup while the distal ends of the wings 43B and 43C of the stirrup are pivotally fixed to the support part 40. The stirrup 43 is therefore capable of pivoting about an axis parallel to the core 43A of the stirrup. The locking finger 41 is integral with the core 43A of the stirrup 43, and has its cooperation end 41A which projects orthogonally to the core 43A and towards the inside of the stirrup between the two wings 43B and 43C , and its gripping end 41B which protrudes oppositely towards the outside of the stirrup. Thus, the pivoting of the locking finger 41 is ensured by the pivoting of the stirrup 43.

En position repliée de l'étai 1, lorsque la coulisse 3 est totalement rangée dans le fût 2 (figure 1), la butée de fin de course 24 pour la coulisse 3 a été placée afin que la pièce de support 40 du système automatique 4 de blocage présente son orifice radial 40' juste en face d'un trou 3' de la coulisse. Ainsi, en position repliée de l'étai 1, la pièce de support 40 repose par son épaulement 42 sur le fût 2, ou éventuellement sur l'écrou 6 si celui-ci est vissé en dépassant légèrement du fût, et le doigt de blocage 41 est en position engagée en passant à travers l'orifice 40' de la pièce de support 40 et à travers un trou 3' de la coulisse (figure 3).In the folded position of the forestay 1, when the slide 3 is completely stored in the barrel 2 ( figure 1 ), the end stop 24 for the slide 3 has been placed so that the support part 40 of the automatic locking system 4 has its radial orifice 40' just opposite a hole 3' of the slide. Thus, in the folded position of the forestay 1, the support piece 40 rests by its shoulder 42 on the barrel 2, or possibly on the nut 6 if the latter is screwed slightly protruding from the barrel, and the locking finger 41 is in the engaged position by passing through the orifice 40' of the support piece 40 and through a hole 3' of the slide ( picture 3 ).

Dès que l'utilisateur veut déployer la coulisse 3 et la positionner à une certaine hauteur, il n'a qu'à soulever la platine supérieure 31, puis en stoppant son geste tout en relâchant la coulisse 3, le doigt de blocage 41 qui est déjà disposé à travers l'orifice 40' de la pièce de support 40 s'introduit automatiquement dans le trou 3' de la coulisse le plus proche et se retrouve comme dans la configuration de la figure 3. L'extrémité de coopération 41A du doigt de blocage 41 est avantageusement biseautée selon une inclinaison du haut vers le bas, ce qui facilite le dégagement immédiat du doigt de blocage lors de son pivotement, le bas du doigt de blocage ne risquant ainsi pas de buter contre la partie inférieure de l'orifice 40' de la pièce de support lors du pivotement (figure 6). L'autre avantage de la forme biseautée est de faciliter le désengagement du doigt automatiquement des trous 3' lors du coulissement vers le haut de la coulisse, et son introduction directe dans un trou lorsque l'on stoppe le coulissement.As soon as the user wants to deploy the slide 3 and position it at a certain height, he only has to lift the upper plate 31, then by stopping his gesture while releasing the slide 3, the locking finger 41 which is already disposed through the orifice 40' of the support part 40 is automatically introduced into the hole 3' of the nearest slide and is found as in the configuration of the picture 3 . The cooperating end 41A of the locking finger 41 is advantageously beveled according to an inclination from top to bottom, which facilitates the immediate release of the locking finger during its pivoting, the bottom of the locking finger thus not risking abutting against the lower part of the 40' hole in the support part during pivoting ( figure 6 ). The other advantage of the beveled shape is to facilitate the automatic disengagement of the finger from the holes 3' during the upward sliding of the slide, and its direct introduction into a hole when the sliding is stopped.

Enfin, le doigt de blocage 41 par sa coopération systématique avec un trou traversant 3' de la coulisse 3 constitue un moyen d'indexage pour la broche 5 à introduire dans ce même trou traversant 3'. L'utilisateur n'a pas à réfléchir, dès que la coulisse 3 est dans une position provisoirement bloquée, il sait que cette position est celle requise pour insérer directement la broche 5 et verrouiller ainsi la coulisse 3.Finally, the locking finger 41 by its systematic cooperation with a through hole 3 'of the slide 3 constitutes an indexing means for the pin 5 to be introduced into this same through hole 3'. The user does not have to think, as soon as the slide 3 is in a temporarily locked position, he knows that this position is the one required to directly insert the pin 5 and thus lock the slide 3.

Avantageusement, la pièce de support 40 porte la broche 5 par sa terminaison libre 5' qui est engagée dans un logement tubulaire 44 radial en saillie de l'extérieur de la pièce de support. Le logement tubulaire 44 communique directement avec un second orifice radial 44' de la pièce de support 40, qui est en vis-à-vis du premier orifice radial 40' accueillant le doigt de blocage 41. De la sorte, la broche 5 est systématiquement en face d'un trou traversant 3' de la coulisse 3. Ainsi, le système automatique 4 de blocage, par son doigt de blocage 41 et par sa pièce de support 40 qui supporte et prépositionne la broche 5, constitue un moyen d'indexation de la broche 5 par rapport aux trous traversants 3' de la coulisse 3. De plus, le logement tubulaire 44 qui est radial impose à la broche 5 sa position orthogonale par rapport au tube 30 de la coulisse, et impose donc une position parfaite en vis-à-vis d'un trou traversant 3' de la coulisse, tout en participant au guidage en translation de la broche 5. L'utilisateur n'a qu'à pousser sur l'anneau 50 dans une direction horizontale pour translater la broche 5 en direction du doigt de blocage 41 jusqu'à pousser ledit doigt de blocage 41 qui pivote alors en dehors du premier orifice radial 40' de la pièce de support 40, permettant à la broche 5 de traverser entièrement la coulisse 3 (figure 5) verrouillant donc la coulisse 3.Advantageously, the support part 40 carries the pin 5 by its free end 5' which is engaged in a radial tubular housing 44 projecting from the outside of the support part. The tubular housing 44 communicates directly with a second radial orifice 44' of the support part 40, which is opposite the first radial orifice 40' accommodating the locking pin 41. In this way, the pin 5 is systematically opposite a through hole 3 'of the slide 3. Thus, the automatic locking system 4, by its locking finger 41 and by its support piece 40 which supports and prepositions the pin 5, constitutes an indexing means of the spindle 5 with respect to the through holes 3' of the slide 3. In addition, the tubular housing 44 which is radial imposes on the spindle 5 its orthogonal position with respect to the tube 30 of the slide, and therefore imposes a perfect position in vis-à-vis a through hole 3 'of the slide, while participating in the translation guidance of the spindle 5. The user only has to push on the ring 50 in a horizontal direction to translate the pin 5 in the direction of the locking finger 41 until said locking finger 41 is pushed which then pivots outside the first radial orifice 40' of the support piece 40, allowing the pin 5 to pass entirely through the slide 3 ( figure 5 ) thus locking slide 3.

Le système automatique 4 de blocage provisoire en descente de la coulisse 3, décrit ci-dessus, en comprenant la pièce de support 40 en forme en douille pourvue de deux orifices radiaux opposés, et le doigt de blocage 41, a été donné à titre d'exemple. D'autres variantes sont envisageables. Par exemple, la pièce de support 40 de la broche 5 pourrait comprendre une plaque supérieure avec une surface arc-boutée vers le bas, tandis que l'anneau de la broche serait agencé sous la plaque supérieure avec sa terminaison libre en butée contre la surface arc-boutée, empêchant ainsi la coulisse de redescendre. Ce blocage provisoire permettrait ensuite la translation de la broche pour assurer le verrouillage. Toutefois, cette variante, bien qu'assurant un blocage provisoire de la coulisse, ne procure pas d'indexation pour le verrouillage. En effet, en l'absence du doigt de blocage qui coopère avec un trou traversant 3' de la coulisse, cette variante ne permet pas de bloquer la coulisse automatiquement de façon que la broche 5 de verrouillage puisse être directement en face d'un trou traversant 3' de la coulisse.The automatic system 4 for temporarily locking the slide 3 on the way down, described above, comprising the support part 40 in the form of a sleeve provided with two opposite radial orifices, and the locking pin 41, has been given as an example. 'example. Other variants are possible. For example, support piece 40 of spindle 5 could comprise a top plate with an abutment surface downwards, while the ring of the spindle would be arranged under the top plate with its free end abutting against the abutment surface, thus preventing the slide from descending. This temporary blocking would then allow the translation of the pin to ensure locking. However, this variant, although providing temporary blocking of the slide, does not provide indexing for locking. Indeed, in the absence of the locking finger which cooperates with a through hole 3 'of the slide, this variant does not allow the slide to be blocked automatically so that the locking pin 5 can be directly opposite a hole crossing 3' of the slide.

De préférence, la coulisse 3 comporte un système anti-rotation par rapport à la pièce de support 40, de façon que le doigt de blocage 41 soit toujours en vis-à-vis de l'axe longitudinal des trous traversants 3'. Un exemple préféré de réalisation du système anti-rotation est illustré sur les figures 8 et 9 : en translatant la pièce de support 40 vers la platine supérieure 31 pour visualiser l'intérieur et le dessous de la pièce de support 40, on voit que le tube 30 de la coulisse 3 présente une rainure 33 longitudinale coopérant avec une forme complémentaire 45 solidaire de l'intérieur de la pièce de support 40. De même, l'intérieur du tube 20 du fût 2 comporte avantageusement une forme complémentaire 26 coopérant avec la rainure 33 de la coulisse 3 de façon à éviter la rotation de la coulisse 3 en position rangée.Preferably, the slide 3 comprises an anti-rotation system with respect to the support part 40, so that the locking pin 41 is always opposite the longitudinal axis of the through holes 3'. A preferred embodiment of the anti-rotation system is illustrated in the figures 8 and 9 : by translating the support part 40 towards the upper plate 31 to visualize the interior and the underside of the support part 40, it is seen that the tube 30 of the slide 3 has a longitudinal groove 33 cooperating with a complementary shape 45 integral from the inside of the support part 40. Similarly, the inside of the tube 20 of the barrel 2 advantageously comprises a complementary shape 26 cooperating with the groove 33 of the slide 3 so as to prevent the rotation of the slide 3 in position row.

Enfin, le système de manœuvre 7 de l'écrou 6 pourrait être une paire de poignées formant une paire d'oreilles comme dans l'art antérieur. Toutefois, dans l'exemple préféré de réalisation illustré, le système de manœuvre 7 de l'écrou 6 consiste en un système de serrage et desserrage à cliquet. Comme montré sur la figure 7, le système de manœuvre 7 à cliquet est solidaire de l'extrémité inférieure 61 de l'écrou 6. Il comporte dans un corps 70 de préférence métallique, une roue à rochet 71 fixée (de préférence par soudage) autour de l'extrémité inférieure 61 de l'écrou, une pièce à double cliquet 72 comprenant deux dents espacées 72A et 72B aptes à coopérer sélectivement avec la roue à rochet 71, et à l'extérieur de l'enveloppe, un bras de manœuvre 73 pour entraîner en rotation le corps 70. La roue à rochet 71 se trouve dans un plan transversal à l'écrou 6. La pièce à double cliquet 72 forme une pièce pivotante apte à être déplacée entre deux positions pour faire coopérer l'une ou l'autre des dents 72A et 72B avec la roue à rochet 71 afin de commander le sens de rotation de la roue à rochet 71, et par conséquent serrer ou desserrer l'écrou 6. La pièce à double cliquet 72 est pivotante autour d'un axe 72' parallèle au corps longitudinal de l'écrou 6. La pièce à double cliquet 72 présente deux surfaces 72-1 et 72-2 accessibles extérieurement au corps 70 (via deux fenêtres 74-1 et 74-2 du corps 70) ; le pivotement se fait en appuyant alternativement sur l'une ou l'autre des surfaces 72-1 et 72-2. De préférence, le bras de manœuvre 73 est pliable en étant pivotant vers le bas et vers le haut, ce qui diminue son encombrement hors utilisation en pouvant être plié à la verticale parallèlement à l'étai, et ce qui facilite sa manœuvre, en particulier lorsque l'espace libre latéral à l'étai ne permet pas d'agencer le bras 73 totalement à l'horizontal.Finally, the operating system 7 of the nut 6 could be a pair of handles forming a pair of ears as in the prior art. However, in the preferred embodiment illustrated, the operating system 7 of the nut 6 consists of a ratchet tightening and loosening system. As shown on the figure 7 , the ratchet operating system 7 is secured to the lower end 61 of the nut 6. It comprises in a body 70, preferably metallic, a ratchet wheel 71 fixed (preferably by welding) around the lower end 61 of the nut, a double ratchet part 72 comprising two spaced teeth 72A and 72B capable of cooperating selectively with the ratchet wheel 71, and outside the casing, an operating arm 73 for rotating the body 70. The ratchet wheel 71 is located in a plane transverse to the nut 6. The double pawl part 72 forms a pivoting part capable of being moved between two positions to cause one or the other of the teeth 72A to cooperate and 72B with the ratchet wheel 71 in order to control the direction of rotation of the ratchet wheel 71, and consequently tighten or loosen the nut 6. The double part pawl 72 is pivotable about an axis 72' parallel to the longitudinal body of the nut 6. The double pawl part 72 has two surfaces 72-1 and 72-2 accessible externally to the body 70 (via two windows 74-1 and 74-2 of body 70); the pivoting is done by pressing alternately on one or the other of the surfaces 72-1 and 72-2. Preferably, the operating arm 73 is foldable by being pivoted downwards and upwards, which reduces its size when not in use by being able to be folded vertically parallel to the forestay, and which facilitates its operation, in particular when the free space on the side of the forestay does not allow the arm 73 to be arranged completely horizontally.

Claims (15)

Etai (1) comportant un fût (2), une coulisse (3) apte à coulisser dans le fût (2) et comprenant des trous traversants (3') répartis selon la longueur de la coulisse, une broche (5) de verrouillage, de préférence imperdable, destinée à être introduite dans un trou traversant (3') pour verrouiller la coulisse (3) en position déployée, et un écrou (6) à fonction de fin de réglage de la hauteur de l'étai, caractérisé en ce qu'il comporte un système automatique (4) de blocage en descente de la coulisse (3), qui est apte à être mis en œuvre automatiquement après déploiement de la coulisse et avant mise en place de la broche de verrouillage (5).Prop (1) comprising a shaft (2), a slide (3) capable of sliding in the shaft (2) and comprising through holes (3') distributed along the length of the slide, a locking pin (5), preferably captive, intended to be introduced into a through hole (3') to lock the slide (3) in the deployed position, and a nut (6) with the function of end of adjustment of the height of the forestay, characterized in that that it comprises an automatic system (4) for blocking the slide (3) on the way down, which is capable of being implemented automatically after the slide has been deployed and before the locking pin (5) has been fitted. Etai selon la revendication 1, caractérisé en ce que le système automatique (4) de blocage en descente comprend un doigt de blocage (41) apte à être mobile, de préférence en pivotement, et apte à s'introduire automatiquement dans un trou traversant (3') de la coulisse lors du relâchement de la coulisse sans traverser la section de ladite coulisse.Prop according to Claim 1, characterized in that the automatic downhill blocking system (4) comprises a blocking finger (41) capable of being movable, preferably in pivoting, and capable of being introduced automatically into a through hole ( 3') of the slide when releasing the slide without crossing the section of said slide. Etai selon la revendication précédente, caractérisé en ce que la broche (5) est agencée de manière fixe en position hors verrouillage de façon à être en vis-à-vis radialement du doigt de blocage (41), tandis que la coulisse (3) comporte un moyen anti-rotation.Prop according to the preceding claim, characterized in that the pin (5) is arranged in a fixed manner in the non-locking position so as to be radially opposite the locking finger (41), while the slide (3) includes an anti-rotation means. Etai selon l'une quelconque des revendications précédentes, caractérisé en ce que le système automatique (4) de blocage en descente comporte une pièce de support (40) qui porte la broche (5) et un doigt de blocage (41) apte à pivoter, la pièce étant en forme de douille en entourant la coulisse (3) et en reposant sur le fût (2) ou l'écrou (6), et étant dotée d'un premier orifice radial dans lequel est engagé le doigt de blocage (41) et d'un second orifice radial (44') opposé dans lequel est apte à être introduit la broche (5), de préférence le second orifice radial étant en communication avec un logement tubulaire radial (44) qui porte la broche (5).Prop according to any one of the preceding claims, characterized in that the automatic downhill blocking system (4) comprises a support piece (40) which carries the pin (5) and a blocking finger (41) capable of pivoting , the part being in the form of a sleeve surrounding the slide (3) and resting on the barrel (2) or the nut (6), and being provided with a first radial orifice in which the locking finger ( 41) and a second opposite radial orifice (44') into which the pin (5) can be inserted, preferably the second radial orifice being in communication with a radial tubular housing (44) which carries the pin (5 ). Etai selon l'une quelconque des revendications 2 à 4, caractérisé en ce que le doigt de blocage (41) constitue en outre un système automatique d'indexation pour l'introduction de la broche (5).Prop according to any one of Claims 2 to 4, characterized in that the locking finger (41) also constitutes an automatic indexing system for the introduction of the pin (5). Etai selon l'une quelconque des revendications 2 à 5, caractérisé en ce que le doigt de blocage (41) est en position libre par gravité.Prop according to any one of Claims 2 to 5, characterized in that the locking pin (41) is in the free position by gravity. Etai selon l'une quelconque des revendications 2 à 6, caractérisé en ce que le doigt de blocage (41) est mobile en pivotement et comporte une extension de préhension (41B) qui est disposée à l'opposé de la coulisse.Prop according to any one of Claims 2 to 6, characterized in that the locking finger (41) is movable in pivoting and comprises a gripping extension (41B) which is arranged opposite the slide. Etai selon l'une quelconque des revendications précédentes, caractérisé en ce que la coulisse (3) comporte un moyen anti-rotation par rapport au système automatique (4) de blocage en descente de la coulisse, en particulier la coulisse (3) comporte une rainure (33) longitudinale qui est ménagée dans la paroi de la coulisse en étant décalée par rapport aux axes longitudinaux des trous traversants, tandis que le système automatique (4) de blocage en descente de la coulisse comporte une forme complémentaire de coopération avec la rainure, de préférence le fût (2) comporte également en son intérieur une forme complémentaire (25) de coopération avec la rainure (33) de la coulisse.Prop according to any one of the preceding claims, characterized in that the slide (3) comprises an anti-rotation means with respect to the automatic system (4) for blocking the slide in descent, in particular the slide (3) comprises a longitudinal groove (33) which is formed in the wall of the slide by being offset with respect to the longitudinal axes of the through holes, while the automatic system (4) for blocking the descent of the slide comprises a complementary form of cooperation with the groove , preferably the shaft (2) also comprises in its interior a complementary form (25) of cooperation with the groove (33) of the slide. Etai selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte un système de manœuvre à cliquet (7) pour visser et dévisser l'écrou (6).Prop according to any one of the preceding claims, characterized in that it comprises a ratchet operating system (7) for screwing and unscrewing the nut (6). Etai selon la revendication précédente, caractérisé en ce que le système de manœuvre à cliquet(7) est un système à double cliquet qui comporte une roue à rochet (71) dont la circonférence intérieure est en prise avec l'extrémité inférieure de l'écrou, une pièce à double cliquet (72) portant deux dents (72A, 72B) et apte à être mobile pour positionner l'une ou l'autre dent en coopération avec la roue à rochet (71), et un bras de manœuvre (73) pour actionner la rotation de la roue à rochet (71), , de préférence la roue à rochet (71) et la pièce à double cliquet (72) sont disposées à l'intérieur d'un corps (70) fermé qui comporte deux fenêtres (74-1, 74-2) depuis lesquelles sont accessibles deux surfaces d'actionnement (72-1, 72-2) permettant de faire pivoter ladite pièce à double cliquet.Prop according to the preceding claim, characterized in that the ratchet operating system (7) is a double ratchet system which comprises a ratchet wheel (71) whose inner circumference engages with the lower end of the nut , a double ratchet piece (72) carrying two teeth (72A, 72B) and adapted to be movable to position one or the other tooth in cooperation with the ratchet wheel (71), and an operating arm (73 ) to actuate the rotation of the ratchet wheel (71), preferably the ratchet wheel (71) and the double pawl part (72) are arranged inside a closed body (70) which comprises two windows (74-1, 74-2) from which are accessible two actuating surfaces (72-1, 72-2) allowing said double pawl part to be pivoted. Etai selon la revendication précédente, caractérisé en ce que le bras de manoeuvre (73) est agencé à l'opposé de la pièce à double cliquet (72) par rapport à la roue à rochet (71), de préférence le bras de manoeuvre (73) étant en outre apte à pivoter autour d'un axe perpendiculaire à l'axe longitudinal de l'étai.Prop according to the preceding claim, characterized in that the operating arm (73) is arranged opposite the double pawl part (72) with respect to the ratchet wheel (71), preferably the operating arm ( 73) being further able to pivot about an axis perpendicular to the longitudinal axis of the forestay. Etai selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte au moins une butée (24, 26) de fin de course de la coulisse (3) à l'intérieur du fût (2), en particulier une butée (26) qui est solidaire du fût (2) et contre laquelle est apte à coopérer un élément (25) solidaire de la coulisse (3) pour assurer une fin de course de déploiement de la coulisse.Prop according to any one of the preceding claims, characterized in that it comprises at least one stopper (24, 26) for the end of travel of the slide (3) inside the shaft (2), in particular a stopper (26) which is integral with the barrel (2) and against which is adapted to cooperate an element (25) integral with the slide (3) to ensure an end of the slide deployment stroke. Etai selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte deux platines inférieure et supérieure (21, 31), respectivement solidaires du fût et de la coulisse, qui comportent des semelles (22, 32) en matière plastique, notamment en caoutchouc, de préférence les semelles étant amovibles.Prop according to any one of the preceding claims, characterized in that it comprises two lower and upper plates (21, 31), respectively secured to the barrel and to the slide, which comprise soles (22, 32) of plastic material, in particular rubber, preferably the soles being removable. Procédé de mise en œuvre d'un étai selon l'une quelconque des revendications précédentes, comportant une étape de déploiement de la coulisse (3) jusqu'à une hauteur voulue, une étape de verrouillage de la coulisse via l'introduction de la broche (5) dans un trou traversant (3'), et éventuellement serrage de l'écrou (6), caractérisé en ce qu'il comporte après l'étape de déploiement de la coulisse (3) et avant l'étape de verrouillage, une étape de relâchement de la coulisse engendrant le blocage automatique de la coulisse via le système automatique (4) de blocage en descente de la coulisse, en particulier l'étape de déploiement de la coulisse se faisant d'une seule main, et l'étape de verrouillage pouvant se faire avec la même main.Method of implementing a prop according to any one of the preceding claims, comprising a step of extending the slide (3) to a desired height, a step of locking the slide by inserting the pin (5) in a through-hole (3'), and optionally tightening the nut (6), characterized in that it comprises, after the step of unfolding the slide (3) and before the locking step, a step of releasing the slide causing the automatic blocking of the slide via the automatic system (4) for blocking the slide in descent, in particular the step of unfolding the slide being done with one hand, and the locking step that can be done with the same hand. Procédé de mise en œuvre selon la revendication précédente et selon l'une quelconque des revendications 2 à 13 caractérisé en ce que le blocage automatique est réalisé par le doigt de blocage (41) s'introduisant automatiquement dans un trou traversant (3') de la coulisse, et le verrouillage s'effectuant en translatant la broche (5) dans le trou traversant à l'opposé du doigt de blocage jusqu'à le chasser en dehors de la coulisse (3).Method of implementation according to the preceding claim and according to any one of Claims 2 to 13 , characterized in that the automatic blocking is achieved by the blocking finger (41) being introduced automatically into a through hole (3') of the slide, and the locking being effected by translating the pin (5) in the through hole opposite the locking pin until it is driven out of the slide (3).
EP22290005.2A 2022-02-10 2022-02-10 Strut that can be locked by an automatic locking system Pending EP4227478A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22290005.2A EP4227478A1 (en) 2022-02-10 2022-02-10 Strut that can be locked by an automatic locking system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22290005.2A EP4227478A1 (en) 2022-02-10 2022-02-10 Strut that can be locked by an automatic locking system

Publications (1)

Publication Number Publication Date
EP4227478A1 true EP4227478A1 (en) 2023-08-16

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1170992A (en) * 1915-06-30 1916-02-08 John H Spence Lifting-jack.
GB521501A (en) * 1938-11-16 1940-05-23 Scaffolding Great Britain Ltd Improvements in tubular struts
FR1210466A (en) * 1958-11-20 1960-03-09 Simplified metal prop with quick adjustment and additional clamping device, for masonry work or other jobs
US3870278A (en) * 1974-03-18 1975-03-11 Booker Arnold Bryce Telescoping stand jack
FR2628466A1 (en) * 1988-03-09 1989-09-15 Rennepont Sa Adjustable length stay for scaffolding etc. - comprises inner tube moving telescopically on outer shaft, with threaded sleeve for fine adjustment
US6746183B1 (en) * 2002-09-23 2004-06-08 James G. Sullivan Shoring device with outer ratcheting collar
NL1025522C1 (en) * 2004-02-19 2005-08-22 Cornelis Blaak Stanchion is for support of ceilings, beams or similar and comprises outermost pipe with support foot at one outer end and at other end innermost pipe telescopically displaceable
EP1602791A2 (en) * 2004-06-03 2005-12-07 Ingenieria de Encofrados y Servicios, S.L. Prop for construction work
EP2378034A2 (en) * 2010-04-16 2011-10-19 Harsco Infrastructure Services GmbH Telescopic vertical tube with dead stop
DE102016100487A1 (en) * 2016-01-13 2017-07-13 Bessey Tool Gmbh & Co. Kg support

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1170992A (en) * 1915-06-30 1916-02-08 John H Spence Lifting-jack.
GB521501A (en) * 1938-11-16 1940-05-23 Scaffolding Great Britain Ltd Improvements in tubular struts
FR1210466A (en) * 1958-11-20 1960-03-09 Simplified metal prop with quick adjustment and additional clamping device, for masonry work or other jobs
US3870278A (en) * 1974-03-18 1975-03-11 Booker Arnold Bryce Telescoping stand jack
FR2628466A1 (en) * 1988-03-09 1989-09-15 Rennepont Sa Adjustable length stay for scaffolding etc. - comprises inner tube moving telescopically on outer shaft, with threaded sleeve for fine adjustment
US6746183B1 (en) * 2002-09-23 2004-06-08 James G. Sullivan Shoring device with outer ratcheting collar
NL1025522C1 (en) * 2004-02-19 2005-08-22 Cornelis Blaak Stanchion is for support of ceilings, beams or similar and comprises outermost pipe with support foot at one outer end and at other end innermost pipe telescopically displaceable
EP1602791A2 (en) * 2004-06-03 2005-12-07 Ingenieria de Encofrados y Servicios, S.L. Prop for construction work
EP2378034A2 (en) * 2010-04-16 2011-10-19 Harsco Infrastructure Services GmbH Telescopic vertical tube with dead stop
DE102016100487A1 (en) * 2016-01-13 2017-07-13 Bessey Tool Gmbh & Co. Kg support

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