WO2024038078A1 - Système d'abaissement, dispositif de support et coffrage de plafond, ainsi que procédé d'abaissement et d'élévation d'un support de construction - Google Patents

Système d'abaissement, dispositif de support et coffrage de plafond, ainsi que procédé d'abaissement et d'élévation d'un support de construction Download PDF

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Publication number
WO2024038078A1
WO2024038078A1 PCT/EP2023/072538 EP2023072538W WO2024038078A1 WO 2024038078 A1 WO2024038078 A1 WO 2024038078A1 EP 2023072538 W EP2023072538 W EP 2023072538W WO 2024038078 A1 WO2024038078 A1 WO 2024038078A1
Authority
WO
WIPO (PCT)
Prior art keywords
articulated arm
support
support housing
lowering
reciprocating piston
Prior art date
Application number
PCT/EP2023/072538
Other languages
German (de)
English (en)
Inventor
Florian Sturm
Lukas STENKE
Original Assignee
Peri Se
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 Peri Se filed Critical Peri Se
Publication of WO2024038078A1 publication Critical patent/WO2024038078A1/fr

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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
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48—Supporting structures for shutterings or frames for floors or roofs
    • E04G11/486—Dropheads supporting the concrete after removal of the shuttering; Connecting means on beams specially adapted for dropheads
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F16M11/043—Allowing translations
    • F16M11/046—Allowing translations adapted to upward-downward translation movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M13/00—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
    • F16M13/02—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle
    • F16M13/027—Ceiling supports
    • 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
    • E04G2025/006—Heads therefor, e.g. pivotable
    • 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
    • E04G5/00—Component parts or accessories for scaffolds
    • E04G5/02—Scaffold feet, e.g. with arrangements for adjustment

Definitions

  • the present invention relates to a lowering device for the construction sector, in particular for lowering ceiling formwork when stripping a building ceiling.
  • the lowering device has a reciprocating piston and a support base, wherein the reciprocating piston is slidably mounted in the support base and can be pushed into the support base from a pushed-out position into a lowering position.
  • the invention also relates to a support device with it and a ceiling formwork with such a support device.
  • the invention further relates to a method for lowering a building support and a method for raising a building support.
  • the formlining is usually formed by formwork elements in the form of simple formwork panels or so-called frame formwork elements, which usually have a steel or aluminum frame.
  • the formlining is supported by support elements or support devices.
  • support devices can be, for example, building supports, which are often designed as telescopic supports, supporting scaffolding and/or consoles.
  • the ceiling formwork formed by the formwork elements and the support devices is under load, ie the weight of the building ceiling is supported on the building ceiling formwork, in particular the support devices.
  • this load means that the parts of the building ceiling formwork are very difficult to remove.
  • a locking device similar to a telescopic stand is formed, for example by a bolt or a wedge, which fixes the lifting piston in the working position, i.e. hinders its displaceability in the support base.
  • the reciprocating piston is supported on the support base via the bolt or the wedge.
  • the wedge or bolt is loosened, i.e. removed, so that the displacement of the reciprocating piston is restored.
  • the reciprocating piston can thus be automatically transferred from the working position to the lowering position - following gravity.
  • a lowering device in which the reciprocating piston is supported against one another by means of an articulated arm which has an eccentric lever rotatably mounted on the support base and a connecting rod element rotatably mounted on the reciprocating piston.
  • a top dead center position in which the means of a bolt-like Parts of the articulated arm connected to the axis of rotation are stretched, i.e. form an approximately 180° angle with one another, corresponds to the working position in which the reciprocating piston is pushed out relative to the support base, and a bottom dead center position in which the parts of the articulated arm are approximately at an O° angle. Forming angles with each other corresponds to the lowering position in which the reciprocating piston is inserted relative to the support base.
  • a slide which is approximately J-shaped in plan view and has a long leg, a short leg and a base connecting the legs is mounted horizontally displaceably, the long leg forming a stop for the connecting rod element and the short one Leg engages around the connecting rod element in a locking position of the slide, while in a release position it releases a pivoting path of the connecting rod element away from the long leg.
  • the long leg has a wedge-shaped slope, which presses against the connecting rod element when the slide is transferred from the locking position to the release position and thereby dissolves the dead center position.
  • the slide is spring-loaded in the direction of the locking position and must be pulled back against the spring tension to release the connecting rod element.
  • a tool engagement groove is provided on the base of the slide located outside the support base.
  • the articulated arm takes up a comparatively large space in the longitudinal direction of the lowering device and requires a large rotation path of approximately 180° of the eccentric lever. Since the eccentric lever and the connecting rod element shear together, coarse construction site dirt that gets into the area between the moving parts can disrupt the movement and thus make reliable operation more difficult. The same applies to the area between the connecting rod element and the slider. Both areas are encapsulated inside the support base and are difficult to access for cleaning. Actuating the slide to initiate lowering requires precise use of tools on the engagement groove of the slide and can be cumbersome and energy-consuming. The engagement of the wedge-shaped bevel on the connecting rod element is sliding or scraping and can quickly lead to wear and failure or unreliable function.
  • the task relating to the lowering device is solved according to the invention at least in partial aspects by a lowering device according to claim 1.
  • the support device according to the invention is specified in claim 13.
  • the ceiling formwork according to the invention has the features specified in claim 14.
  • the method according to the invention for lowering a building support has the steps specified in claim 15.
  • the method according to the invention for lowering a building support has the steps specified in claim 16.
  • Advantageous developments of the invention are specified in the dependent claims and in the description.
  • the lowering device according to the invention is particularly suitable for support devices in the construction sector and for lowering ceiling formwork when stripping a building ceiling.
  • the lowering device has a lifting piston, in particular forming a support head at one end, and a support housing.
  • the lifting piston is mounted in the support housing so as to be displaceable in the direction of a longitudinal axis of the lowering device and can be pushed into the support base from a pushed-out support or working position into a lowered position.
  • the lowering device has an articulated arm with a swivel joint arranged between its ends, which is articulated at one end to the reciprocating piston and at the other end to the support housing, the reciprocating piston and the support housing being supported against one another in the working position via the articulated arm.
  • an articulated arm holding device which is set up to hold the articulated arm in an extended position around a top dead center in the working position, in which the articulated arm has a substantially straight position. de stretching axis, and triggered by applying a pulse substantially perpendicular to the stretching axis and a joint axis of the swivel joint in a flexion direction of the articulated arm from outside the support housing to generate a force on the articulated arm in the same direction as the applied impulse, which is equal to or greater as a dead center overcoming threshold value is to release the articulated arm to move the reciprocating piston into the lowering position.
  • the longitudinal axis of the lowering device coincides with the longitudinal axis of the reciprocating piston and thus defines a direction of movement of the reciprocating piston, which also corresponds to a direction of support.
  • the direction of support is also assumed to be a vertical direction in accordance with the main purpose of the lowering device, with the direction of pushing out the reciprocating piston being assumed to be “up”.
  • the lowering device can also be used in such a way that the longitudinal axis is horizontal or extends obliquely or the lowering device is arranged upside down, i.e. extending downwards.
  • Articulation points and pivot points are understood to be points on the center lines of the respective articulation axes and the articulation axis of the swivel joint, which lie in a plane perpendicular to the articulation axes and the articulation axis of the swivel joint.
  • the extended position therefore corresponds to a swivel joint angle of approximately 180°. This is a top dead center position in which all forces in the respective axes act in one line and are supported in an unstable equilibrium. If the swivel joint angle becomes smaller than 180°, the articulated arm bends and the reciprocating piston lowers relative to the support housing.
  • the articulated arm or the swivel joint can also be slightly overstretched beyond the extended position in the working position, i.e. by up to 1 or a little more degrees can be pivoted beyond the top dead center and supported laterally against a system. This can compensate for tolerances in the mutual position of the components as well as wear effects, so that the working position can be reliably assumed to support the components.
  • a system can be provided in the return pivoting direction, which limits overstretching.
  • the support load can also press the articulated arm further against the system, so that a force is required to overcome the dead center position, which can fundamentally contribute to reliable operation.
  • the top dead center position enables optimal power transmission, but is potentially unstable.
  • the articulated arm holding device allows the balance around the top dead center to be safely maintained, which means that the unstable balance is not broken under normal operating conditions.
  • the articulated arm holding device is further set up to be triggered by applying an impulse substantially perpendicular to the extension axis and the joint axis of the swivel joint in a flexion direction of the articulated arm from outside the support housing to generate a force on the articulated arm in the same direction as the applied impulse, which is equal to or is greater than a dead center overcoming threshold value to release the articulated arm in order to move the reciprocating piston into the lowering position.
  • This enables even large loads to be lowered using a comparatively light application of force, such as a hammer blow.
  • the applied impulse also acts directly in the direction of bending the articulated arm, which can also enable more intuitive and ergonomic work.
  • the articulated arm can automatically assume the extended position and be held by the articulated arm holding device, which can improve operational safety and efficiency during handling.
  • the impulse from outside can, but does not have to, have to be initiated at the articulated arm holding device.
  • the lowering device according to the invention has a simple operating principle, which can be applied to a variety of support elements. It enables significant time savings when removing formwork from concrete ceilings and therefore has a positive cost effect.
  • the low amount of force required means that the handling advantage is that no or only a small amount of aid is required when stripping the formwork and it is possible to strip the formwork under load without prior loosening.
  • the articulated arm holding device can comprise at least one resilient pressure piece which is arranged on or in the articulated arm and cooperates with at least one recess, in particular in the form of an elongated hole, on or in the support housing in order to close the articulated arm in the extended position around the top dead center in the working position hold.
  • the resilient pressure piece can, for example, be provided with a spherical or at least curved outer surface of a pressure end piece, which is resiliently supported by a pressure piece housing, is guided by the pressure piece housing and protrudes from one end of the pressure piece housing.
  • the printing end piece can be a ball.
  • Such pressure pieces are known per se and can be purchased cheaply as standard components according to the specification, especially with regard to spring travel and pressure force. In the end position, the pressure piece can latch into the respective recess and hold the articulated arm securely in a defined position until the pressure force is overcome by an external force.
  • the at least one resilient pressure piece can have at least one pair of resilient pressure pieces, which are each arranged on ends of the swivel joint facing an inner surface of the support housing, facing away from one another, in particular integrated into the joint axis of the swivel joint. This enables symmetrical operation in which moments in a plane passing through the axis of the swivel joint of the articulated arm can be avoided or at least minimized.
  • the dead center overcoming threshold value can be determined or at least co-determined by the force that is required to compress the resilient pressure piece(s) so that the resilient pressure piece(s) are lifted out of the respective recess and rest against one/the inside of the support housing.
  • the pressure force of the pressure piece, together with the engagement geometries, determines metric on the recess, in particular the engagement depth and the edge design of the recess, the dead center overcoming threshold value.
  • the articulated arm can advantageously comprise a connecting rod element rotatably connected to the reciprocating piston, an eccentric lever rotatably connected to the support housing and the swivel joint connecting the connecting rod element and the eccentric lever.
  • a striking plate accessible from outside the support housing is attached, in particular formed, by receiving the applied impulse of the reciprocating piston can be moved into the lowering position.
  • a striking plate is understood to mean any surface that is suitable for receiving the impulse, for example in the form of a projection, stamp, anvil, circumferential ring or the like.
  • a firing pin can be guided by the support housing and is accessible from outside the support housing in such a way that a strike on the firing pin can generate an impulse that is sufficient to generate the force acting on the articulated arm, which acts substantially perpendicular to the extension axis and the articulated axis, directed in the flexion direction of the articulated arm, and is equal to or greater than the dead center overcoming threshold value. Thanks to the guided firing pin or striker plate, the direction of the force acting on the articulated arm can be reliably maintained and misses can be avoided or reduced, since the direction of the externally applied impulse also corresponds to the direction of the force on the articulated arm.
  • the firing pin can also transmit the externally applied impulse to the striking plate.
  • the firing pin can be subjected to a spring force by means of a spring element, so that when the firing pin is released, it is accelerated in the direction of and against the articulated arm. In this way, even without a hammer blow, the dead center overcoming threshold value can be overcome particularly reliably, easily and reproducibly with the same, defined and well-dosed force.
  • a spring reset can also be provided, which returns the firing pin or the sliding element to the starting position after the hammer or spring has been actuated and thus “arms” the lowering trigger mechanism again for the next lowering process.
  • a return spring element in particular in the form of a leg spring, can also be provided, which interacts with the articulated arm and/or directly with the reciprocating piston in such a way that the reciprocating piston is pressed in the direction of the working position by means of the return spring element. In this way, an automatic or at least supported return of the articulated arm to the extended position can be achieved.
  • a leg spring has an approximately cylindrical center piece and two legs projecting approximately tangentially from the center piece.
  • the return spring element in the form of a leg spring can be integrated into the mechanism in a particularly functional and space-saving manner, in that the middle piece is mounted on the support housing about the axis of rotation of the lower linkage of the articulated arm and the first leg is supported downwards against the support housing and the second leg against it in the lifting direction the joint axis of the swivel joint is supported, or the middle piece is mounted around the joint axis of the swivel joint and the first leg is supported downwards against the axis of rotation of the lower linkage of the articulated arm on the support housing and the second leg in the lifting direction against the axis of rotation of the upper linkage of the articulated arm Reciprocating piston is supported, so that the reciprocating piston can be pressed in the direction of the working position by means of the return spring element.
  • the return spring element can thus be mounted directly on the axis around which it is intended to rotate.
  • the support housing can advantageously have a recess such that at least one outward-facing section of the articulated arm, in particular of the swivel joint, projects into the recess and/or through it in the lowered position can.
  • This allows the dimension of the lowering device to be reduced in the longitudinal direction, since the length of the links of the articulated arm, in particular an eccentric lever and the connecting rod element, are no longer limited by the dimensions of the support housing and the stroke of the reciprocating piston is limited by longer articulated arm members which protrude laterally from the support housing can be represented, so that the swivel joint in the lowered position no longer has to rotate to a swivel joint angle of 0° into a bottom dead center position, but the lowered position is already assumed with the swivel joint protruding laterally from the support housing.
  • the pivoting range of the articulated arm is therefore not limited to the interior of the support housing; the length of the articulated arm can be designed independently of the cross section of the support housing and the reciprocating piston.
  • the links of the articulated arm no longer shear with each other, which also prevents them from jamming due to coarse dirt, so that reliable operation can be ensured and premature wear can be avoided.
  • the swivel joint and the links of the articulated arm can also be made simpler and more stable using simple axle bolts, since the swivel joint axis does not swing through one of the articulated arm members.
  • a housing flap can be attached to the support housing and set up to at least partially cover the recess for shielding against external influences as soon as the at least one is exposed to the outside facing section of the articulated arm no longer protrudes through the recess.
  • the housing flap can, for example, be designed to be deformable and rigidly attached or to be rigid and hinged, in particular resiliently and/or closing by gravity.
  • the housing flap can have elastic properties, such as thin spring material or plastic material. This allows operational safety to be further improved.
  • a clamping lever element that can be actuated from outside the support housing can be arranged, by actuating it, for example in the form a clamping of the clamping lever element with an opening in or an elevation on the support housing, which holds the reciprocating piston in the working or lowering position.
  • the clamping lever element can be provided as an alternative or in addition to other holding elements, such as spring pressure pieces or the like.
  • the support device according to the invention for the construction sector comprises at least one lowering device as described above, the support device being a construction support, in particular a heavy-duty support, or a support structure, in particular in the form of a support tower.
  • the support frame can also be or include other general support structures such as trusses, support gratings, or other east-receiving elements such as a console or another support device familiar to those skilled in the art in the development of support structures in the construction sector.
  • the ceiling formwork according to the invention has the support device described above and a formlining element, the formlining element being supported by means of the lowering device.
  • a fresh concrete ceiling is supported via the formlining elements mentioned.
  • Other applications for the support device or lowering device according to the invention, which do not require a formlining element relate, for example, to prefabricated element ceilings or existing concrete ceilings in dismantling, which are supported directly via support supports.
  • the method according to the invention for lowering a building support has the following steps:
  • a lowering device in particular at a lower end of the building support in its erected state when the building support is erected, with a support housing, a reciprocating piston which is slidably mounted in the support housing and can be pushed from a pushed-out working position into a lowering position, an articulated arm with a swivel joint, which is articulated at one end to the reciprocating piston and at the other end to the support housing, the reciprocating piston and the support housing is supported against one another in the working position via the articulated arm, and an articulated arm holding device which, in the working position, holds the articulated arm in an extended position around the top dead center, in which the articulated arm has a substantially straight extension axis,
  • the method uses the lowering device described above in the intended manner and can therefore achieve the same advantages and effects as this. For example, it can contribute to significant time and cost savings by facilitating a stripping operation on the construction site.
  • the reciprocating piston can be held in the working or lowering position by actuating a clamping lever element which is arranged on the free end section of the articulated arm and can be actuated from outside the support housing.
  • the actuation can take place, for example, in the form of jamming the clamping lever element with an opening in or an elevation on the support housing.
  • the method according to the invention for lifting a building support has the following steps: Providing the building support with a lowering device, in particular at a lower end of the building support in its erected state when the building support is erected, with a support housing, a reciprocating piston which is slidably mounted in the support housing and can be pushed from a pushed-out working position into a lowering position, an articulated arm with a swivel joint, which is articulated at one end to the reciprocating piston and at the other end to the support housing, the reciprocating piston and the support housing being supported against one another in the working position via the articulated arm, and an articulated arm holding device which, in the working position, surrounds the articulated arm in an extended position top dead center, in which the articulated arm has a substantially straight extension axis, with the reciprocating piston in the lowering position,
  • Raising the reciprocating piston from the lowering position into the working position for example by means of a return spring element of the support housing, in particular in the form of a leg spring, which interacts with the articulated arm in such a way that the reciprocating piston is pressed in the direction of the working position by means of the return spring element, and
  • the articulated arm holding device Holding the articulated arm in the working position by the articulated arm holding device, the articulated arm being held in the extended position around the top dead center, in which the articulated arm has a substantially straight extension axis, until triggered by an application of an impulse essentially perpendicular to the extension axis and a joint axis of the swivel joint in a flexion direction of the articulated arm from outside the support housing to generate a force on the articulated arm in the same direction as the applied impulse, which is equal to or greater than a dead center overcoming threshold value, the articulated arm is released.
  • the method uses the lowering device described above in the intended manner and can therefore achieve the same advantages and effects as this. len. For example, it can contribute to significant time and cost savings by facilitating a formwork process on the construction site.
  • FIGs. 1 A-1 E a lowering device according to an exemplary embodiment in a working position A and in a lowering position B in a partially sectioned side view, in the working position in a partially sectioned front view C and a sectioned top view D as well as a detail E;
  • FIG. 2 shows a spring pressure element in the lowering device from 1 A-1 E in two perspective views
  • Figs. 3A, 3B show a partially sectioned side view of a lowering device according to a further exemplary embodiment in a working position A and in a lowering position B;
  • Figs. 4A, 4B show a partially sectioned side view of a lowering device according to a further exemplary embodiment in a working position A and in a lowering position B;
  • Fig. 5 shows a support device with a strut and one according to the invention
  • Lowering device according to an embodiment of the invention
  • 6 shows a support device in the form of a building support according to an exemplary embodiment of the invention
  • Fig. 7 shows an upper part of a building support with a conventional lowering mechanism.
  • a lowering device 10 according to an exemplary embodiment of the invention is shown in various views in FIGS. 1A to 3B.
  • the lowering device 10 has a longitudinal axis designated E, a support housing 1, a reciprocating piston 2, and an articulated arm 3 with a swivel joint 7 arranged between its ends, the articulated arm 3 being connected to the reciprocating piston 2 at one end via an upper linkage 4 and at the other end via a lower one Linkage 5 is articulated to the support housing 1.
  • the reciprocating piston 2 is mounted in the support housing 1 so as to be displaceable in the direction of a longitudinal axis L and can be inserted from a pushed-out working position P1 into a lowered position P2.
  • FIG. 1 A, 1 C and 1 D The reciprocating piston 2 and the position of the articulated arm 3 are shown in the figures. 1 A, 1 C and 1 D in the working position and in Figs. 1 B and 3B in the lowered position.
  • the longitudinal axis L is defined as the vertical axis z and the extension direction of the reciprocating piston 2 is defined as "up", i.e. positively vertical, regardless of the position of the lowering device 10, 10 ', 10 "or the support device 50, 60 in the room.
  • the extension direction of the reciprocating piston 2 along the longitudinal axis L thus coincides with a local vertical direction z.
  • the axes of rotation of the upper linkage 4, the swivel joint 7 and the lower linkage 5 run parallel to a direction that is perpendicular to the vertical axis z and as a transverse direction y be defined.
  • a direction in which the articulated arm 3 swings out of the extended position and which is perpendicular to the axes z and y thus defines a remaining local direction or swing-out direction x.
  • the reciprocating piston 2 has a shaft section 15 and a flange plate 16 arranged at an upper end of the shaft section 15, and the support base 1 has a shaft section 12 and a flange plate 11 arranged at its lower end.
  • the fl an sch plates 11, 16 also each form a support head of the lowering device and can be connected, preferably welded, to the respective shaft section 12, 15 in a manner known per se.
  • the shaft section 12 of the support housing 1 is slightly larger in cross section than the shaft section 15 of the reciprocating piston 2, so that the shaft section 12 of the support housing 1 accommodates the shaft section 15 of the reciprocating piston 2 in a displaceable manner in the direction of the longitudinal axis L.
  • the shaft section 12 of the support housing 1 has an upper edge 12a, on which an underside of the flange plate 16 of the reciprocating piston 2 can rest in the lowering position P2.
  • the upper edge 12a can have a depression in the middle, so that the underside of the flange plate 16 of the reciprocating piston 2 only rests in the corners of the upper edge 12a, which can make leveling easier.
  • placing the reciprocating piston 2 on the upper edge 12a is not mandatory; rather, other stop elements can be provided on the shaft section 15 of the reciprocating piston 2 or on the shaft section 12 of the support housing 1, which limit an insertion path of the reciprocating piston 2.
  • the height difference along the longitudinal axis L between the working position P1 and the lowering position P2 is characterized by a stroke H.
  • the stroke H can typically be around 20 mm, but this is purely an example.
  • the articulated arm 3 has a connecting rod element 3a as a first or upper link and an eccentric lever 3b as a second or lower link.
  • the connecting rod element 3a is articulated at a bound end section via the upper linkage 4 to the reciprocating piston 2.
  • the eccentric lever 3b is articulated at a bound end section via the lower linkage 5 to the support housing 1.
  • the connecting rod element 3a and the eccentric lever 3b are rotatably connected to one another at their free ends by means of the swivel joint 7.
  • the connecting rod element 3a and the eccentric lever 3b are located in a substantially straight extension of the longitudinal axis L of the support housing 1, viewed in the insertion direction of the reciprocating piston 2, beyond, i.e. below, the upper linkage 4 and are supported downwards against the support housing 1, upwards against the reciprocating piston 2 and against each other.
  • the extended position of the articulated arm 3 defines the highest position of the reciprocating piston 2 and thus determines the working position P1.
  • the reciprocating piston 2 and the support housing 1 are supported against each other in the working position P1 via the articulated arm 3 in the extended position of the articulated arm 3.
  • the articulated arm In the lowered position P2, the articulated arm is in a flexed position in which a swivel joint angle in the swivel joint 7 between the connecting rod element 3a and the eccentric lever 3b is less than 180 ° and the swivel joint 7 is swung out laterally relative to the longitudinal axis.
  • the connecting rod element 3a can be designed as a tubular or monolithic lever arm.
  • the eccentric lever 3b can have two parallel, plate-shaped cheeks 28a, 28b, which accommodate the connecting rod element 3a between them in the area of the swivel joint 7, cf. Fig. 1 C.
  • the upper linkage 4 has a continuous shaft or bolt which is mounted in bores in walls of the shaft section 15 of the reciprocating piston 2 and the connecting rod element 3a of the articulated arm 3 and defines an upper pivot axis.
  • the lower linkage 5 has a continuous shaft or bolt, which is mounted in bores in walls of the shaft section 12 of the support housing 1 and the eccentric lever 3b of the articulated arm 3 and defines a lower pivot axis.
  • the swivel joint 7 has a continuous shaft or bolt, which is mounted in holes in the walls of the connecting rod element 3a and the eccentric lever 3b of the articulated arm 3 and defines a swivel joint axis.
  • disks can be provided which are arranged on the respective bolt.
  • differently designed pivot bearings can also be provided.
  • the bolt of the upper linkage 4 can pass through a guide opening, such as an elongated hole, in the wall of the shaft section 12 of the support housing 1 protrude or disappear inside the support housing 1.
  • the axial securing of the bolts can be done at one end via a head of the bolt and at the other end via a fastening means 17, such as a snap ring, a locking nut, a locking pin or the like, as shown for the lower linkage 5 in FIG. 1C, see also the illustration of the swivel joint 7 in Fig. 1 D.
  • bolts of the upper linkage 4 and/or the lower linkage 5 can also be inserted into respective bores in a wall of the shaft section 15 of the reciprocating piston 2 or the shaft section 11 of the support housing 1 or in cheeks 28a , 28b of the eccentric lever 3b screwed in or pressed or driven in.
  • the reciprocating piston 2 In the extended position of the articulated arm 3, the reciprocating piston 2 is in the working position P1. This corresponds to a dead center position of the articulated arm. If necessary, in the working position P1, the articulated arm 3 can also be slightly overstretched, approximately 0.5° or 1°, beyond the dead center position, i.e. beyond 180° of the swivel joint angle, so that the balance between the reciprocating piston 2, articulated arm 3 and support housing 1 is stabilized , when the articulated arm 3, in particular in the area of the swivel joint 7, comes into contact with the support housing 1, in particular an inner wall of the shaft section 12 of the same, or another stop element and through which on the reciprocating piston
  • an articulated arm triggering device in the form of a firing pin 19 can be provided.
  • the firing pin 19 is guided horizontally in a bushing 6, which is inserted into the wall of the shaft section 12 of the support housing 1 at essentially the same height on the longitudinal axis L as the swivel joint 7, and has an externally accessible striking surface 19a can be acted upon with an impulse 25, for example by striking a hammer.
  • the impulse is transmitted via a striking surface 19b provided at the other axial end of the firing pin 19 to a striking plate 18 formed on the connecting rod element 3a in the area of the swivel joint 7 in the form of an annular elevation.
  • a force that is essentially perpendicular to the axis of rotation of the swivel joint 7 and to the longitudinal axis L of the support housing 1 can be directed in a direction of flexion of the articulated arm 3 and is equal to or greater than the dead center overcoming threshold to release the articulated arm 3, applied to the articulated arm 3 to move the reciprocating piston 2 to the lowering position P2.
  • the striking plate 18 can also be designed in a different way than as an annular elevation, for example as an anvil-like one-sided elevation or as a hardened area, or can be omitted entirely.
  • the striking plate 18 for example in the form of an annular circumferential or anvil-like one-sided elevation, can be accessible from the outside for a hammer blow or the like or protrude through a housing opening in the wall of the support housing 12.
  • the firing pin 19 can be subjected to a spring force by means of a spring element, so that when the firing pin 19 is released, it is accelerated towards and against the articulated arm 3.
  • the firing pin itself does not necessarily have to be accessible from the outside, but a locking element, for example in the form of a catch, can be provided, which blocks the path of the firing pin and which can be actuated from the outside in order to release the firing pin so that it can be pushed through the Spring element can be accelerated.
  • a restoring mechanism can also be provided which returns the spring-loaded firing pin to a starting position against the spring force, the locking element being able to spring back into the locking position, if necessary due to a spring preload or its own elasticity, in order to "arm" the firing pin again.
  • the abutting surface 19b can also serve as a contact surface in the stretching or over-stretching direction of the articulated lever 3 in the swivel joint 7.
  • the eccentric lever 3b can have a protruding stop cam at the lower end, which is designed to rest on the base plate 11 of the support housing 1 in the extended position or slightly over-extended position.
  • the reciprocating piston 2 is biased in the extension direction by a return spring element 13, see FIGS. 1 A and 1 B.
  • the return spring element 13 interacts with the articulated arm 3 and/or directly with the reciprocating piston 2 and/or directly with the support housing 1 in such a way that the reciprocating piston 2 is pressed in the direction of the working position P1 by means of the return spring element.
  • the return spring element 13 is designed as a leg spring, the approximately cylindrical middle piece of which is mounted about the axis of rotation of the lower linkage 5, with a first leg and a second leg protruding approximately tangentially from the middle piece.
  • the first leg is supported downwards against a surface 1 1 a of the flange plate 1 1 of the support housing 1 and the second leg is supported in the stretching direction or lifting direction against the axis of the swivel joint 7.
  • the return spring element 13 is compressed in the flexed position of the articulated arm 3, so that the spring force initially acts in a spreading direction of the return spring element 13 around the axis of the lower linkage 5, cf. Fig. 1 B.
  • This forces the eccentric lever 3b to move Turning the lower linkage 5 around straightens itself up and thereby stretches the swivel joint 7, and the reciprocating piston 2 is pressed in the extension direction.
  • the reciprocating piston 2 can thus be pressed in the direction of the working position P1 by means of the return spring element 13.
  • the return spring element 13 can also exert a preload in the stretching direction and support the dead center position.
  • the return spring element 13 enables the reciprocating piston 2 to be automatically returned to the working position P1. The rapid lowering of the lowering device 10 is therefore activated.
  • the lowering device 10 also has an articulated arm holding device, which is set up to hold the articulated arm 3 in the extended position in the working position P1.
  • the articulated arm holding device has a pair of resilient pressure pieces 20, which are arranged on the articulated arm 3 facing away from one another and facing an inner surface of the support housing 1, and which cooperate with at least one respective recess 21 in the form of an elongated hole in the support housing 1 in order to Working position P1, the articulated arm 3 in the extended position to maintain the dead center.
  • the resilient pressure pieces 20 are integrated into a support shaft of the swivel joint 7 at opposite ends or end faces 27 of the support shaft.
  • the resilient pressure pieces 20 can each have a pressure end piece 23, which is resilient, here by means of an im Pressure piece housing 22 located pressure element 24, such as a compression spring or a gas cushion, is supported by a pressure piece housing 22, is guided by the pressure piece housing 22 and protrudes from one end of the pressure piece housing 22, cf. Fig. 1 E.
  • the pressure end piece 23 can be spherical or at least spherical or curved outer surface and can in particular be designed as a spherical pressure end piece 23, which can rotate in the pressure piece housing 22. In modifications, pressure end pieces with a wedge-shaped or conical outer surface are also possible.
  • the sum of the holding effects of all resilient pressure pieces 20 in the respective recesses 21 determines the overall holding effect of the articulated arm holding device.
  • the dead center overcoming threshold value is thus determined or at least co-determined by the force that is required to compress the resilient pressure piece(s) 20, so that the resilient pressure piece(s) 20 are lifted out of the respective recess 21 and rest against one/the inside of the support housing 1.
  • the holding effect of each resilient pressure piece 20 is determined, among other things, by the shape of the pressure end piece 23, the depth of penetration into the recess 21 and the shape of an edge of the recess 21.
  • a pair arrangement has the advantage of a symmetrical application of force and can avoid transverse forces in the articulated arm 3 and bending moments on the swivel joint 4.
  • more than two resilient pressure pieces 20 or more than one pair of resilient pressure pieces 20 can also be provided in order to increase the holding effect or the holding security.
  • a recess 12b is provided in the wall of the shaft section 12 of the support housing 1, through which an outward-facing section of the articulated arm 3, in particular of the swivel joint 7, protrudes beyond the limits of the cross section of the shaft section 12 of the support housing 1 in the lowered position P2 can.
  • articulated arm members 3a, 3b can be used without having to change the dimensions of the shaft section 12.
  • the swivel joint angle in the lowered position P2 does not have to be smaller than approximately 70° in order to achieve the required stroke H.
  • FIGS. 3A and 3B A lowering device 10 'according to a further exemplary embodiment is shown in FIGS. 3A and 3B shown.
  • the lowering device 10 'of this exemplary embodiment is a modification of the previously described exemplary embodiment and differs from it only with regard to the features described below, and the FIGS. 3A and 3B correspond in view and section to the Figs. 1 A and 1 B.
  • the structure of the lowering device 10 'with support housing 1, lifting piston 2, articulated arm 3, upper linkage 4, lower linkage 5, swivel joint 7, return spring element 13 and firing pin 19 therefore basically corresponds to that of the lowering device 10 of the previous exemplary embodiment.
  • the recess 12b in the wall of the shaft section 12 of the support housing 1 is covered by a housing flap 30, so that the articulated arm 3 is also covered in the swing-out direction.
  • the housing flap 30 can be made of a rigid material and can be pivotally mounted hanging on the support housing 12 by means of a linkage 31 using a pin, clip or bolt or the like. In the working position P1, the housing flap lies downwards under the effect of its own weight and rests on an outer surface of the shaft section 12 of the support housing 1, so that the recess 12b is covered, see FIG. 3A.
  • the housing flap 30 In the lowered position P2, the housing flap 30 is also pushed outwards by the articulated arm 3, which bends laterally outwards, and opens a little by pivoting around the linkage 31. When pushing out the reciprocating piston 2 into the Working position P1, the housing flap 30 closes automatically again.
  • the housing flap 30 can also be biased in the closing direction by a spring element, not shown in detail.
  • FIGS. 4A and 4B A lowering device 10" according to a further exemplary embodiment is shown in FIGS. 4A and 4B.
  • the lowering device 10' of this exemplary embodiment is a modification of the previously described exemplary embodiment and differs from it only with regard to the features described below, and FIGS. 4A and 4B 3A and 3B in view and section.
  • the structure of the lowering device 10" with support housing 1, lifting piston 2, articulated arm 3, upper linkage 4, lower linkage 5, swivel joint 7, return spring element 13 and firing pin 19 therefore basically corresponds to that of the lowering device 10 'of the previous exemplary embodiments.
  • another housing flap 40 is provided, which is made of a flexible, in particular elastic, material and is suspended via a plug 41 in the upper region of the shaft section 12 of the support housing 1. How does the housing flap 40 cover the recess 12b in the wall of the shaft section 12 of the support housing 1, so that the articulated arm 3 is also covered in the swing-out direction, is pushed away from the articulated arm 3 outwards in the lowered position P2.
  • the pushing away does not take place by pivoting around an articulation, but in the form of a bend in the material of the housing flap 40, and the return to the closed position takes place by gravity and / or the inherent elasticity of the housing flap 40.
  • An upper section 40a of the housing flap 40 can always rest against the wall of the shaft section 12 and only a lower section 40b of the housing flap 40 is affected by the folding away and folding back.
  • a clamping lever can also be provided to lock the articulated arm 3 in the extended position.
  • the clamping lever can, for example, be rotatably mounted on the connecting rod element 3a of the articulated arm 3 and can be pivoted between a clamping position and a release position. In a clamping position, the clamping lever can engage with one end in a clamping groove or behind an elevation which is formed in the base plate 11 of the support housing 1, when the articulated arm 3 is in the extended position. In the release position, the end of the clamping lever can be released from the clamping groove or elevation, so that the pivoting movement of the articulated arm 3 is also released.
  • Such a clamping lever can thus form a locking device for the articulated arm 3 in the extended position or the working position P1 of the reciprocating piston 2.
  • the clamping lever can also be or form an articulated arm holding device in the sense of the invention. By using such a locking device, a precise vertical alignment of the reciprocating piston 2 in the dead center position can be achieved and a simple unlocking mechanism for lowering the reciprocating piston 2 can be provided.
  • a clamping lever can also be mounted on the support housing 1 instead of on the articulated arm 3 and can engage in or behind an engagement element on the articulated arm 3 in the clamping position.
  • FIG. 5 shows a support device 50 with a strut 51 and the lowering device 10 of the first exemplary embodiment, the support device 50 also being an embodiment of the invention.
  • the support device 50 is suitable for the construction sector, so the strut 51 can be, for example, a construction support, in particular a heavy-duty support, or a stay of a support structure, such as a support tower.
  • the strut 51 has a flange plate 52 at the end, which fits together with the flange plate 16 of the reciprocating piston 2 of the lowering device 10.
  • the flange plate 52 of the strut 51 has a drilling pattern of holes that at least partially corresponds to holes on the flange plate 16 of the reciprocating piston 2, so that the flange plates 16, 52 can be screwed and/or pinned together. To make assembly easier, centering elements and counter-centering elements can also be provided.
  • Fig. 6 shows a support device 60 with a strut 61 designed as a heavy-duty support for the construction sector and the lowering device 10 of the first exemplary embodiment.
  • the heavy-duty support or strut 61 is designed in a manner known per se in the form of a telescopically copyable construction support with an outer tube 62 in which an inner ear 63 is guided in a longitudinally displaceable manner.
  • the inner tube 63 is provided with a head plate 64 at its free end.
  • a locking bolt 65 is used here, which passes through through recesses 66 of the inner tube 63 and in an elongated hole 71 the outer tube 62 is guided.
  • the locking bolt 65 is supported against the outer tube 62 in an axial direction to the longitudinal axis L of the support device 60 on an adjusting nut 67, which engages in an external thread 68 of the outer tube 62.
  • the lowering device 10 is attached to the strut 61 on the foot side, purely as an example.
  • the support head 16 of the lowering device 10 is screwed to a base plate 69 of the outer tube 62 of the strut 61 or can be attached to the base plate 69 in another way.
  • the lowering device 10 can also be attached to the head plate 64 of the building support.
  • the adjusting nut 67 can be moved by means of a handle 70 attached to the adjusting nut 67. In this way, the adjusting nut 67 is actuated as intended to raise the inner tube 63 relative to the outer tube 62.
  • the telescopic strut 61 is well known in the construction industry and is widely used.
  • the loosening process can be tedious and time-consuming because the adjusting nut 67 is difficult to move under load due to tension and friction in the thread, with this problem increasing over time due to contamination, aging and wear, corrosion and mechanical damage to the thread.
  • the elements required for release are often located in an elevated, difficult-to-access location, which requires the use of scaffolding, ladders, risers or other equipment or operation in a hanging position from above. The reasons are difficult lowering of the building supports, the need for often multiple hammer blows on a rotating element or the use of special tools, a lot of time and effort when lowering ceiling supports and increases in costs, especially in premium markets.
  • the use of the lowering device 10 according to the invention makes the lowering process considerably easier and faster, which can also lead to noticeable savings. Nevertheless, the conventional strut 61 can continue to be used together with the lowering device 10 according to the invention, with the adjusting nut 67 only being used for length presetting or length adjustment without load, but lowering only takes place via the lowering device 10. It should be noted that lifting to the working position P1 on site via the Lowering device 10 can take place. In practice, however, it can be advantageous to assemble and place the support device 60 and the lowering device 10 with the reciprocating piston 2 in the working position P1 and to make the final length adjustment for supporting a formwork or the like via the adjusting nut 67.
  • All of the support devices 50, 60 described form independent exemplary embodiments of the invention. Even if each support device 50, 60 is described in connection with the first exemplary embodiment of a lowering device 10, any of the lowering devices 10, 10 ', 10" or one of their described variants can be used in each support device 50, 60.
  • the lowering device 10, 10 ', 10" according to the invention can also be used in other applications, such as on a road slab console.
  • a road slab console can be formed from a triangular steel support structure with holes forming various screwing options. One of these holes can be the lowering device 10, 10 ', 10" according to the invention can be fastened with guide bolts.
  • the steel support structure can be adjustable in such a way that it can be adapted to different angles of inclination of side walls of a box structure for formwork of a roadway slab.
  • the support head 16 of the reciprocating piston 2 can have a roller over which, for example, a rail of a ceiling formwork in a feed concreting process, i.e. H. a cycle sliding system, as is usually used in bridge construction.
  • An additional guide pin can be guided through pin through holes in the support housing 1 and guide slots in the reciprocating piston 2.
  • a retrofittable, compact quick lowering device is created, especially for loaded building supports, which can completely relieve the load on the building supports, simplify construction site processes and improve the formwork speed of known ceiling formwork systems.
  • the lowering of large loads can be done by applying slight force, for example a simple hammer blow and/or an automatic reset of the lowering mechanism after the ceiling support has been raised.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Manipulator (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

La présente invention concerne un système d'abaissement (10) pour le secteur de la construction, en particulier pour abaisser des coffrages de plafond pendant le retrait de coffrages du plafond d'un bâtiment. Le système d'abaissement comprend : un boîtier de support (1) ; un piston alternatif (2) qui est monté dans le boîtier de support (1) pour pouvoir être déplacé dans la direction d'un axe longitudinal (L) du système d'abaissement (10) et qui peut être poussé entre une position de travail étendue (P1) et une position abaissée (P2) ; un bras articulé (3) ayant une articulation rotative (7) qui est située entre ses extrémités et est articulée au niveau d'une extrémité au piston alternatif (2) et à l'autre extrémité au boîtier de support (1), le piston alternatif (2) et le boîtier de support (1) étant supportés l'un contre l'autre dans la position de travail (P1) au moyen du bras articulé (3) ; et un dispositif de maintien de bras articulé qui est conçu pour maintenir le bras articulé (3) dans la position de travail (P1) dans une position étendue autour d'un point mort haut, dans ladite position étendue le bras articulé (3) ayant un axe d'extension sensiblement droit, et pour libérer le bras articulé (3) afin de déplacer le piston alternatif (2) dans la position abaissée (P2), ladite libération étant déclenchée par l'application d'une impulsion (25) sensiblement perpendiculaire à l'axe d'extension et à un axe d'articulation de l'articulation rotative (7) dans une direction de flexion du bras articulé (3) depuis l'extérieur du boîtier de support (1) afin de générer une force sur le bras articulé (3) dans la même direction que l'impulsion appliquée (25), ladite force étant supérieure ou égale à une valeur seuil pour dépasser le point mort haut. L'invention concerne également : un dispositif de support comprenant le système d'abaissement ; et un coffrage de plafond comprenant un tel dispositif de support. L'invention concerne également : un procédé d'abaissement d'un support de construction ; et un procédé d'élévation d'un support de construction.
PCT/EP2023/072538 2022-08-17 2023-08-16 Système d'abaissement, dispositif de support et coffrage de plafond, ainsi que procédé d'abaissement et d'élévation d'un support de construction WO2024038078A1 (fr)

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DE102022120780.3 2022-08-17
DE102022120780.3A DE102022120780A1 (de) 2022-08-17 2022-08-17 Absenkeinrichtung, Stützvorrichtung und Deckenschalung, sowie Verfahren zum Absenken und Anheben einer Baustütze

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03194063A (ja) * 1989-12-21 1991-08-23 Okabe Co Ltd 走行式型枠支保工
KR20070001483A (ko) * 2005-06-29 2007-01-04 서보가설산업 주식회사 슬라브 거푸집 서포터용 드롭장치
EP1884400B1 (fr) * 2006-08-02 2011-01-26 Wonderland Nurserygoods Co., Ltd. Dispositif support pour siège de sécurité enfant dans une voiture
US20150308612A1 (en) * 2014-04-28 2015-10-29 Victor Hung Automatic Rise Jack Stand
WO2019162486A1 (fr) * 2018-02-26 2019-08-29 Safetyrespect Ab Montant de support
WO2019170192A1 (fr) 2018-03-09 2019-09-12 Peri Gmbh Dispositif d'abaissement ainsi que dispositif de support et coffrage de plafond doté d'en tel dispositif d'abaissement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD141432A1 (de) 1979-01-16 1980-04-30 Otto Bahro Schnellabsenkvorrichtung,insbesondere fuer decken-und balkenschalung
GB2344609B (en) 1998-12-08 2002-07-24 Sgb Services Plc Improvements in or relating to a scaffolding arrangement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03194063A (ja) * 1989-12-21 1991-08-23 Okabe Co Ltd 走行式型枠支保工
KR20070001483A (ko) * 2005-06-29 2007-01-04 서보가설산업 주식회사 슬라브 거푸집 서포터용 드롭장치
EP1884400B1 (fr) * 2006-08-02 2011-01-26 Wonderland Nurserygoods Co., Ltd. Dispositif support pour siège de sécurité enfant dans une voiture
US20150308612A1 (en) * 2014-04-28 2015-10-29 Victor Hung Automatic Rise Jack Stand
WO2019162486A1 (fr) * 2018-02-26 2019-08-29 Safetyrespect Ab Montant de support
WO2019170192A1 (fr) 2018-03-09 2019-09-12 Peri Gmbh Dispositif d'abaissement ainsi que dispositif de support et coffrage de plafond doté d'en tel dispositif d'abaissement

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