EP0734996B1 - Easy assembly vehicle jack - Google Patents

Easy assembly vehicle jack Download PDF

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Publication number
EP0734996B1
EP0734996B1 EP19960400669 EP96400669A EP0734996B1 EP 0734996 B1 EP0734996 B1 EP 0734996B1 EP 19960400669 EP19960400669 EP 19960400669 EP 96400669 A EP96400669 A EP 96400669A EP 0734996 B1 EP0734996 B1 EP 0734996B1
Authority
EP
European Patent Office
Prior art keywords
jack
nut
axis
head
forming part
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.)
Expired - Lifetime
Application number
EP19960400669
Other languages
German (de)
French (fr)
Other versions
EP0734996A1 (en
Inventor
Gilles Ruffie
David Framboisier
Jean-Jacques Tate
Bernard Figueras
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.)
BOWDEN FRANCE SA
Original Assignee
BOWDEN FRANCE SA
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Filing date
Publication date
Application filed by BOWDEN FRANCE SA filed Critical BOWDEN FRANCE SA
Publication of EP0734996A1 publication Critical patent/EP0734996A1/en
Application granted granted Critical
Publication of EP0734996B1 publication Critical patent/EP0734996B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/12Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated comprising toggle levers

Definitions

  • the present invention relates to a vehicle jack comprising a supporting leg and a lifting arm pivotally mounted on the leg support, to be moved by means of a control screw to lift the vehicle.
  • Jacks of this type commonly known as "Y jacks", are described for example in patent applications EP-0 320 613, EP-0 565 801, GB-2 176 458 and FR-2 663 015.
  • the control screw turns in a part forming a nut pivotally received in support leg recesses.
  • An object of the present invention is to provide a jack of the type above, of simplified assembly and executable by a robot.
  • the nut-forming part is retained on the support leg by engagement of a retaining element, integral with the piece forming a nut, in at least one curvilinear lumen formed on the support leg and centered on the hinge axis of the nut-forming part.
  • each recess of the supporting leg receiving the piece forming a nut constitutes a groove the bottom of which is delimited by a semicircular edge with an opening width greater than or equal the diameter of said semicircular edge.
  • the support leg has the general shape of a U-shaped cross section, and said retaining element is a rivet passing through the nut-forming part and axially bearing on the faces external of the two wings of the profile.
  • the wall of the wings of said profile bordering said recesses is curved to increase the bearing surface in contact with the part forming a nut.
  • the jack comprises a jack head arranged in the alignment of the control screw so that it is in contact axially on the head of the jack at least during operation of the jack when the latter works empty and the control screw is actuated in the direction of folding the jack.
  • control screw has a stepped head resting axially against a thrust ball bearing at least during jack operation when the jack is loaded.
  • this thrust ball bearing is housed in a yoke articulated on the lifting arm around the same axis of rotation as the lifting head jack.
  • the jack head is articulated on the lifting arm about an axis of rotation perpendicularly cutting the longitudinal axis of the control screw.
  • the jack 1 shown in the figures has a support leg 2 intended to rest, by a lower end forming a foot 3, on the ground.
  • a lifting arm 4 is articulated at one end on this support leg 2, and supports at the other end a head 5 intended to come into contact with the vehicle to lift.
  • the lifting arm 4 is articulated on the supporting leg 2 around a axis of rotation X perpendicular to the plane of Figure 1.
  • the head 5 of the jack 1 is articulated on the lifting arm 4 around an axis of rotation Y parallel to the X axis.
  • the control screw 6 extends along a longitudinal axis W parallel to the plane of Figure 1, perpendicularly cutting the X axis. It crosses a piece forming a nut 8 hinged on the support leg 2 about an axis of rotation Z intersecting the W axis and parallel to the X axis.
  • the jack 1 is symmetrical by relation to a plane of symmetry containing the W axis and perpendicular to the X axis.
  • the head 5 of the jack 1 is shown in isolation in FIGS. 3 to 5. It is preferably made of plastic, and has a body 50 crossed by a cylindrical bore 51 of revolution around the Y axis, for the passage of a hinge pin 98 of the head 5 on the lifting arm 4.
  • Two fingers 52, 53 extend the body 50 above (when the jack is in the deployed position for lifting a vehicle as shown in the figure 1) and define between them a groove 54, opening upwards, for the engagement of the head 5 on a weld bead or a rebate of the vehicle body, protruding downward, or any other part of the vehicle provided for this purpose.
  • the respective surfaces 540, 541 of the fingers 52, 53, facing each other, are flat and parallel.
  • Head 5 has surfaces stop 520, the role of which will be explained below, located at the base of finger 52 and extending, flat, at an angle of 44 ° 30 'with the plane of the surfaces 540 and 541. The lower ends of these surfaces have been referenced 521 stop 520.
  • the body 50 also has a cylindrical surface 55 of revolution around the Y axis, extending over an angular sector of 60 °.
  • the control screw 6 has a helical thread 60 extending along the axis W, engaged in the part forming the nut 8, and comprises at a axial end a shouldered head 61. It is provided at the axial end opposite of a tip 66 on which the handle 7 is articulated, about an axis of rotation perpendicularly cutting the W axis.
  • the shouldered head 61 rests by its axial end edge 63 against the surface 55 of the head at and by its shoulder, referenced 64, on a ball bearing 62 bearing on a yoke 9.
  • This ball bearing 62 comprises, in a manner known per se, two rings 62a, 62b of axis W, defining paths of bearing for balls 62c interposed between the rings 62a, 62b.
  • the yoke 9 is shown in isolation in Figures 6 to 8. It has two flanges 90, planes and parallel to each other, joined by a base 91. The latter extends perpendicular to the plane of the flanges 90. Des holes 92 of Y axis are provided on the flanges 90 for the passage of the articulation pin 98 above, and the rotational mounting of the yoke 9 on the lifting arm 4 around the axis Y.
  • the base 91 is crossed by a bore 93 for the passage of the control screw 6.
  • the ring 62b of the ball bearing 62 rests against the face 910 of the base 91 facing the interior space at flanges 90. These are perforated at 94 as shown in FIG. 8 to save material.
  • edges 95 are present, observed in the direction of the Y axis, a generally triangular contour, delimited laterally by two straight edges 95 converging towards the Y axis, these edges 95 being joined at their end opposite the base 91 by an edge 96 in arc of a circle, centered on the Y axis, and connecting to base 91 by edges rectilinear 97, parallel to the W axis.
  • FIGS. 9 to 14 show the lifting arm 4 in isolation.
  • the latter is preferably produced by stamping, cutting and folding of a sheet to form an elongated metal profile in the direction of a longitudinal axis V perpendicular to the X and Y axes.
  • This profile has a cross section having the general shape of a U, as shown more particularly in Figures 11 to 13. It has two wings 40 joined by a back 41 extending generally perpendicular to the wings 40.
  • oblong recesses 42 from stamping extend parallel to the V axis on the wings 40 to stiffen the profile. These recesses 42 protrude into the interior space of the profile located between the wings 40.
  • An oblong recess 43, projecting inwards, is produced on back 41 for the same purpose.
  • the wings 40 are pierced at one end longitudinal, at 44, for the passage of the aforementioned pin 98 and the assembly in rotation of the head 5, of the yoke 9 and of the lifting arm 4. These holes 44 are made at a longitudinal end of the recesses 42.
  • the wings 40 are drilled at the opposite longitudinal end, at 46, for the passage a pin 28 of axis X used for the articulation of the lifting arm 4 on the support leg 2.
  • These holes 46 are made on circular stampings 47 projecting outwards from the profile, as shown more particularly in FIG. 12. These circular stampings 47 are located in the extension of the recesses 42, leaving an interval 470 with these as shown in Figure 9.
  • the back 41 is extended, the end of the lifting arm 4 articulated on the support leg 2, by a wall 48 extending obliquely between the wings 40 and forming a spacer.
  • the wall 48 results from cutting and bending the sheet metal used to make the profile, as shown in Figure 14.
  • the longitudinal ends of the wings 40 have at the end articulated on the support leg 2 a profile generally triangular, observed in the direction of the X axis. This profile is delimited by two rectilinear orthogonal edges 401, 402 joined by an edge in an arc 403 centered on the axis X.
  • the wall 48 extends in the plane of the edges 401 and forms with the back 41 a dihedral of angle at the top 238 °.
  • FIGS. 15 to 19 show separately the part forming nut 8.
  • the latter is preferably made of plastic.
  • She comprises a body 80 crossed along the axis W by a thread 81 adapted to receive the threaded body 60 of the control screw 6.
  • Lateral parts 82 protrude on either side of the body 80 for the articulation of the part forming nut 8 on the supporting leg 2.
  • These lateral parts 82 are delimited radially, on the outside, by cylindrical surfaces of revolution around from the Z axis, and axially by planar end sections 83 and perpendicular to the Z axis.
  • the nut forming part 8 also comprises two tabs 84 crossed by holes 85 of axis T parallel to the axis Z, for mounting of means for retaining the piece forming a nut 8 on the leg support 2, as will be explained below.
  • the legs 84 are connected to the body 80 with the grooves 82 of the grooves annulars 86 centered on the Z axis.
  • the apex dihedral Z axis, delimited by the plane perpendicular to the W axis and by the plane containing the T axis, is at an angle summit 60 °.
  • FIGS. 24 to 29 show the support leg 2 in isolation.
  • the latter is preferably carried out by stamping, cutting and folding of a sheet to form an elongated profile along a longitudinal axis G perpendicular to the Z axis.
  • This profile has a cross section having the general shape of a U, comprising two wings 20 joined by a back 21.
  • Each wing 20 has an oblong recess 22 coming from stamping, projecting into the interior space of the profile located between the wings 20, and intended to stiffen the profile.
  • the foot 3 is formed by cutting and folding as illustrated in the Figure 29. More specifically, the foot 3 has a first planar wall 30 connecting to the back 21 by a fold line 31 and forming, in position jack assembly, an angle of 43 ° with the back 21 as shown in the Figure 24.
  • This wall 30 is extended downwards by a flat wall 32 intended to serve as a bearing surface on the ground.
  • We have referenced 33 the line of folding extending to the junction of the walls 30 and 32.
  • the dihedral having for vertex the fold line 33 and delimited by the planes of the walls 30 and 32 has a angle at the summit of 142 °.
  • the wall 30 widens away from the back 21 until reaching a width approximately double that of the back 21 at the level of the fold line 33.
  • the width of the wall 32 is constant. This last rests, by its face opposite to that coming to bear on the ground, against the wing edge 20.
  • the free edges 23 of the wings 20 are curved outwards as shown more particularly on the cross sections of Figures 27 and 28, for the purpose of stiffening the profile.
  • Cross section of the supporting leg 2 is generally constant from the foot 3 to the about half the height of the supporting leg 2, where the width of the wings 20 increases and becomes maximum up to a hole 24 used for passage of the pivot 28 of the articulation of the lifting arm 4.
  • the width of the wings 20 then decreases to the height of the upper longitudinal ends 26 recesses 22, where the wings 20 form notches 211.
  • the back 21 stops at the height of these notches 211.
  • the width of the wings 20 increases above the notches 211 towards the upper end of the leg support 2, located opposite foot 3, to recesses 25 formed on the wings 20, serving as articulation bearings around the axis Z to the part forming a nut 8.
  • the back 21 forms, at the height of the holes 24, a dihedral projecting outwards, from angle to summit 152 °.
  • edges 23 extend straight, parallel to the recesses 22, from their lower end resting against the wall 32 up to the plane containing the Z axis and perpendicular to the G axis.
  • the edges 23 extend beyond this plane, in arcs of circle 230 and end in rectilinear portions 231 perpendicular to the G axis.
  • the recesses 25 have, as shown in FIG. 24, edges in the shape of a semicircle 250, centered on the Z axis and of radius adapted to that of the cylindrical surfaces 82. These semicircular edges 250 are extended below by straight edges 251 perpendicular to the longitudinal axis G, and above, by rectilinear edges 252 extending parallel to the edges 251 but over a corresponding distance about a quarter of the length of the straight edges 25l. Edges 250, 251 and 252 are bent towards the interior space located between the wings 20 to form bearing surfaces 253 coming into contact with the surfaces cylindrical 82 of the nut-forming part 8. These bearing surfaces 253 are of generator parallel to the Z axis.
  • the recesses 25 define grooves whose the bottom is constituted by the semicircular edges 250 and whose width opening, that is to say the distance separating the straight edges 251 and 252, is at least equal to the diameter of the semicircular edges 250.
  • Each curvilinear lumen 27 extends along a midline K in an arc located at the same distance from the Z axis as the distance between the latter and the axis T of the holes 85, and has at its ends longitudinal of the semicircular edges 270 and 271.
  • the dihedral having for vertex the Z axis, delimited by the planes containing the axes of the semicircular edges 270 and 271, is at an angle at the top 115 °.
  • the plane containing the Z axis and the axis of the semi-circular holes 270 extends parallel to the edges straight 251.
  • the mounting of the nut-forming part 8 on the support leg 2 is easily carried out by engaging the nut forming part 8 provided with the screw control 6 in the recesses 25, up to the stop of the cylindrical surfaces 82 against the semicircular edges 250.
  • the introduction of the part forming nut 8 can be made by a simple translational movement in a direction perpendicular to the Z axis and suitable for execution mechanized.
  • the holes 85 of the tabs 84 of the piece forming the nut 8 are then positioned opposite the curved lights 27.
  • a rivet 89 is introduced into the curved lights 27 and the holes 85 to retain the nut forming part 8 on the supporting leg 2. After the riveting operation, the rivet 89 comes to bear axially at its axial ends on the surface external 200 of the wings 20 bordering the curvilinear lights 27.
  • jack 1 The operation of jack 1 is as follows.
  • the user turns the handle 7 and drives in rotation the control screw 6 around the axis W.
  • the displacement longitudinal of the control screw 6 which results from its rotation in the internal thread 81 causes the lifting arm 4 to pivot in the direction time in Figure 1 and the upward movement of the head 5.
  • the rotation of the lifting arm 4 is accompanied by a displacement of the rivet 89 in the curvilinear lights 27 until the latter stops against the semi-circular edges 270.
  • Jack 1 is then in its maximum lifting position and the control screw is subjected to tensile forces when the jack is in charge.
  • the surfaces 540 and 541 are normally oriented vertically in the vehicle lifting position, as shown in Figure 1, and the front surface 63 of the ball stop 62 is then located at the end of the cylindrical surface 55 furthest from the fingers 52 and 53. Any rotation additional head to counterclockwise is prevented by stopper lower ends 521 of stop surfaces 520 against edges end 201 of the wings 20, as illustrated in FIG. 22 more particularly.
  • control screw 6 To fold the jack 1, the user turns the control screw 6. As long as jack 1 lifts the vehicle, i.e. works under load, the screw control 6 works in tension and the thrust ball 62 is stressed axially in compression. When the jack has been folded enough and does not no longer lifts the vehicle, i.e. works when empty, control screw 6 axially abuts by the end edge 63 against the surface 55 of the head 5. This ensures the training of the lifting arm 4 without using stop sleeve engaged on the control screw as is the case on known jacks.
  • a jack according to the invention has a space requirement in the folded position sufficiently weak for its accommodation in a rim of spare wheel, in particular thanks to the special arrangement of the bolt control 6 on the jack 1.
  • the jack is assembled easily and can be executed by a robot.
  • the positioning of the axes of rotation X, Y and Z, in particular the intersection of the W and Y axes is advantageous from the point of kinematic view.
  • Rivet 89 increases the safety of using the jack preventing the wings of the supporting leg 2 from spreading.
  • a stop sleeve is not necessary and the free rotation of the head to on the lifting arm 4 reduces the risk of damage to the vehicle body in the event of improper positioning of the jack.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)

Description

La présente invention concerne un cric de véhicule comprenant une jambe d'appui et un bras de levage monté à pivotement sur la jambe d'appui, à déplacer au moyen d'une vis de commande pour soulever le véhicule.The present invention relates to a vehicle jack comprising a supporting leg and a lifting arm pivotally mounted on the leg support, to be moved by means of a control screw to lift the vehicle.

Des crics de ce type, communément appelés "crics Y", sont décrits par exemple dans les demandes de brevet EP-0 320 613, EP-0 565 801, GB-2 176 458 et FR-2 663 015. Dans ces crics connus, la vis de commande tourne dans une pièce formant écrou reçue de manière pivotante dans des évidements de la jambe d'appui.Jacks of this type, commonly known as "Y jacks", are described for example in patent applications EP-0 320 613, EP-0 565 801, GB-2 176 458 and FR-2 663 015. In these known jacks, the control screw turns in a part forming a nut pivotally received in support leg recesses.

Un objet de la présente invention est de proposer un cric du type précité, de montage simplifié et exécutable par un robot.An object of the present invention is to provide a jack of the type above, of simplified assembly and executable by a robot.

Elle y parvient par le fait que la pièce formant écrou est retenue sur la jambe d'appui par engagement d'un élément de retenue, solidaire de la pièce formant écrou, dans au moins une lumière curviligne ménagée sur la jambe d'appui et centrée sur l'axe d'articulation de la pièce formant écrou.It achieves this by the fact that the nut-forming part is retained on the support leg by engagement of a retaining element, integral with the piece forming a nut, in at least one curvilinear lumen formed on the support leg and centered on the hinge axis of the nut-forming part.

Avantageusement, chaque évidement de la jambe d'appui recevant la pièce formant écrou constitue une gorge dont le fond est délimité par un bord demi-circulaire et dont la largeur d'ouverture est supérieure ou égale au diamètre dudit bord demi-circulaire.Advantageously, each recess of the supporting leg receiving the piece forming a nut constitutes a groove the bottom of which is delimited by a semicircular edge with an opening width greater than or equal the diameter of said semicircular edge.

Avantageusement, la jambe d'appui a la forme générale d'un profilé de section transversale en U, et ledit élément de retenue est un rivet traversant la pièce formant écrou et prenant axialement appui sur les faces externes des deux ailes du profilé.Advantageously, the support leg has the general shape of a U-shaped cross section, and said retaining element is a rivet passing through the nut-forming part and axially bearing on the faces external of the two wings of the profile.

Avantageusement, la paroi des ailes dudit profilé bordant lesdits évidements est recourbée pour augmenter la surface de portée au contact de la pièce formant écrou.Advantageously, the wall of the wings of said profile bordering said recesses is curved to increase the bearing surface in contact with the part forming a nut.

Avantageusement, le cric comporte une tête de cric disposée dans l'alignement de la vis de commande de sorte que cette dernière est en appui axialement sur la tête du cric au moins lors du fonctionnement du cric lorsque ce dernier travaille à vide et que la vis de commande est actionnée dans le sens tendant à replier le cric.Advantageously, the jack comprises a jack head arranged in the alignment of the control screw so that it is in contact axially on the head of the jack at least during operation of the jack when the latter works empty and the control screw is actuated in the direction of folding the jack.

Avantageusement, la vis de commande présente une tête épaulée reposant axialement contre une butée à billes au moins lors du fonctionnement du cric lorsque ce dernier est en charge.Advantageously, the control screw has a stepped head resting axially against a thrust ball bearing at least during jack operation when the jack is loaded.

Avantageusement, cette butée à billes est logée dans une chape articulée sur le bras de levage autour du même axe de rotation que la tête de cric. Advantageously, this thrust ball bearing is housed in a yoke articulated on the lifting arm around the same axis of rotation as the lifting head jack.

Avantageusement, la tête de cric est articulée sur le bras de levage autour d'un axe de rotation coupant perpendiculairement l'axe longitudinal de la vis de commande.Advantageously, the jack head is articulated on the lifting arm about an axis of rotation perpendicularly cutting the longitudinal axis of the control screw.

D'autres caractéristiques et avantages de la présente invention apparaítront à la lecture de la description détaillée qui va suivre, d'un exemple de réalisation non limitatif de l'invention, et à l'examen du dessin annexé sur lequel :

  • la figure 1 est une vue de côté d'un cric conforme à l'invention, en position déployée de levage d'un véhicule,
  • la figure 2 est une coupe schématique dans un plan contenant l'axe de rotation de la vis de commande, montrant certains éléments constitutifs du cric représenté sur la figure 1,
  • la figure 3 est une vue de côté de la tête du cric représenté sur la figure 1,
  • la figure 4 est une vue frontale de la tête représentée sur la figure 3,
  • la figure 5 est une vue de dessus de la tête représentée sur la figure 3,
  • la figure 6 est une vue frontale de la chape du cric représenté sur la figure 1,
  • la figure 7 est une vue de dessus de la chape représentée sur la figure 6,
  • la figure 8 est une vue de côté de la chape représentée sur la figure 6,
  • la figure 9 est une vue de côté du bras de levage du cric représenté sur la figure 1,
  • la figure 10 est une vue de dessus du bras de levage représenté sur la figure 9,
  • la figure 11 est une section selon le trait de coupe XI de la figure 9,
  • la figure 12 est une section selon le trait de coupe XII de la figure 9,
  • la figure 13 est une section selon le trait de coupe XIII de la figure 9,
  • la figure 14 montre, à plat, une extrémité de la tôle servant à réaliser le bras de levage,
  • la figure 15 est une vue de côté de la pièce formant écrou du cric représenté sur la figure 1,
  • la figure 16 est une vue de dessus de la pièce formant écrou représentée sur la figure 15,
  • la figure 17 est une section selon le trait de coupe XVII de la figure 16,
  • la figure 18 est une section selon le trait de coupe XVIII de la figure 16,
  • la figure 19 est une vue frontale de la pièce formant écrou représentée sur la figure 15,
  • la figure 20 montre, en vue de côté, le cric représenté sur la figure 1 en position repliée,
  • la figure 21 est une vue de dessus du cric représenté sur la figure 20,
  • la figure 22 montre, à échelle agrandie, la tête du cric lorsque ce dernier est en position déployée,
  • la figure 23 montre, à échelle agrandie, la tête du cric lorsque ce dernier est en position repliée,
  • la figure 24 est une vue de côté de la jambe d'appui du cric représenté sur la figure 1,
  • la figure 25 est une vue frontale de la jambe d'appui représentée sur la figure 24,
  • la figure 26 est une vue de dessus de la jambe d'appui représentée sur la figure 24,
  • la figure 27 est une section selon le trait de coupe XXVII de la figure 24,
  • la figure 28 est une section selon le trait de coupe XXVIII de la figure 24,
  • la figure 29 montre, à plat, une extrémité de la tôle servant à réaliser la jambe d'appui.
Other characteristics and advantages of the present invention will appear on reading the detailed description which follows, of a non-limiting exemplary embodiment of the invention, and on examining the appended drawing in which:
  • FIG. 1 is a side view of a jack according to the invention, in the deployed position for lifting a vehicle,
  • FIG. 2 is a diagrammatic section in a plane containing the axis of rotation of the control screw, showing certain elements constituting the jack shown in FIG. 1,
  • FIG. 3 is a side view of the head of the jack shown in FIG. 1,
  • FIG. 4 is a front view of the head shown in FIG. 3,
  • FIG. 5 is a top view of the head shown in FIG. 3,
  • FIG. 6 is a front view of the clevis of the jack shown in FIG. 1,
  • FIG. 7 is a top view of the yoke shown in FIG. 6,
  • FIG. 8 is a side view of the yoke shown in FIG. 6,
  • FIG. 9 is a side view of the jack lifting arm shown in FIG. 1,
  • FIG. 10 is a top view of the lifting arm shown in FIG. 9,
  • FIG. 11 is a section along the section line XI of FIG. 9,
  • FIG. 12 is a section along the section line XII in FIG. 9,
  • FIG. 13 is a section along the section line XIII in FIG. 9,
  • FIG. 14 shows, flat, one end of the sheet used to make the lifting arm,
  • FIG. 15 is a side view of the part forming the jack nut shown in FIG. 1,
  • FIG. 16 is a top view of the part forming a nut shown in FIG. 15,
  • FIG. 17 is a section along the section line XVII of FIG. 16,
  • FIG. 18 is a section along the section line XVIII in FIG. 16,
  • FIG. 19 is a front view of the nut-forming part shown in FIG. 15,
  • FIG. 20 shows, in side view, the jack shown in FIG. 1 in the folded position,
  • FIG. 21 is a top view of the jack shown in FIG. 20,
  • FIG. 22 shows, on an enlarged scale, the head of the jack when the latter is in the deployed position,
  • FIG. 23 shows, on an enlarged scale, the head of the jack when the latter is in the folded position,
  • FIG. 24 is a side view of the support leg of the jack shown in FIG. 1,
  • FIG. 25 is a front view of the support leg shown in FIG. 24,
  • FIG. 26 is a top view of the support leg shown in FIG. 24,
  • FIG. 27 is a section along the section line XXVII of FIG. 24,
  • FIG. 28 is a section along the section line XXVIII of FIG. 24,
  • Figure 29 shows, flat, one end of the sheet used to make the support leg.

Le cric 1 représenté sur les figures comporte une jambe d'appui 2 destinée à reposer, par une extrémité inférieure formant pied 3, sur le sol. Un bras de levage 4 s'articule à une extrémité sur cette jambe d'appui 2, et supporte à l'autre extrémité une tête 5 destinée à venir au contact du véhicule à soulever. Une vis de commande 6, sur laquelle s'articule à une extrémité une poignée d'entraínement 7, permet de déplacer le bras de levage 4 pour lever ou descendre la tête 5.The jack 1 shown in the figures has a support leg 2 intended to rest, by a lower end forming a foot 3, on the ground. A lifting arm 4 is articulated at one end on this support leg 2, and supports at the other end a head 5 intended to come into contact with the vehicle to lift. A control screw 6, on which is articulated to a end a drive handle 7, allows to move the arm lifting 4 to raise or lower the head 5.

Le bras de levage 4 s'articule sur la jambe d'appui 2 autour d'un axe de rotation X perpendiculaire au plan de la figure 1. La tête 5 du cric 1 s'articule sur le bras de levage 4 autour d'un axe de rotation Y parallèle à l'axe X. La vis de commande 6 s'étend selon un axe longitudinal W parallèle au plan de la figure 1, coupant perpendiculairement l'axe X. Elle traverse une pièce formant écrou 8 s'articulant sur la jambe d'appui 2 autour d'un axe de rotation Z coupant l'axe W et parallèle à l'axe X. Le cric 1 est symétrique par rapport à un plan de symétrie contenant l'axe W et perpendiculaire à l'axe X.The lifting arm 4 is articulated on the supporting leg 2 around a axis of rotation X perpendicular to the plane of Figure 1. The head 5 of the jack 1 is articulated on the lifting arm 4 around an axis of rotation Y parallel to the X axis. The control screw 6 extends along a longitudinal axis W parallel to the plane of Figure 1, perpendicularly cutting the X axis. It crosses a piece forming a nut 8 hinged on the support leg 2 about an axis of rotation Z intersecting the W axis and parallel to the X axis. The jack 1 is symmetrical by relation to a plane of symmetry containing the W axis and perpendicular to the X axis.

La tête 5 du cric 1 est représentée isolément sur les figures 3 à 5. Elle est de préférence réalisée en matière plastique, et comporte un corps 50 traversé par un perçage 51 cylindrique de révolution autour de l'axe Y, pour le passage d'un tourillon d'articulation 98 de la tête 5 sur le bras de levage 4. Deux doigts 52, 53 prolongent supérieurement le corps 50 (lorsque le cric est en position déployée de levage d'un véhicule comme représenté sur la figure 1) et définissent entre eux une gorge 54, s'ouvrant vers le haut, pour l'engagement de la tête 5 sur un cordon de soudure ou une feuillure de la caisse du véhicule, formant saillie vers le bas, ou sur toute autre partie du véhicule prévue à cet effet. Les surfaces 540, 541 respectives des doigts 52, 53, se faisant face, sont planes et parallèles. La tête 5 comporte des surfaces d'arrêt 520, dont le rôle sera précisé dans la suite, situées à la base du doigt 52 et s'étendant, planes, en formant un angle de 44°30' avec le plan des surfaces 540 et 541. On a référencé 521 les extrémités inférieures de ces surfaces d'arrêt 520. Le corps 50 présente également une surface 55, cylindrique de révolution autour de l'axe Y, s'étendant sur un secteur angulaire de 60°.The head 5 of the jack 1 is shown in isolation in FIGS. 3 to 5. It is preferably made of plastic, and has a body 50 crossed by a cylindrical bore 51 of revolution around the Y axis, for the passage of a hinge pin 98 of the head 5 on the lifting arm 4. Two fingers 52, 53 extend the body 50 above (when the jack is in the deployed position for lifting a vehicle as shown in the figure 1) and define between them a groove 54, opening upwards, for the engagement of the head 5 on a weld bead or a rebate of the vehicle body, protruding downward, or any other part of the vehicle provided for this purpose. The respective surfaces 540, 541 of the fingers 52, 53, facing each other, are flat and parallel. Head 5 has surfaces stop 520, the role of which will be explained below, located at the base of finger 52 and extending, flat, at an angle of 44 ° 30 'with the plane of the surfaces 540 and 541. The lower ends of these surfaces have been referenced 521 stop 520. The body 50 also has a cylindrical surface 55 of revolution around the Y axis, extending over an angular sector of 60 °.

La vis de commande 6 présente un filetage hélicoïdal 60 s'étendant selon l'axe W, engagé dans la pièce formant écrou 8, et comporte à une extrémité axiale une tête épaulée 61. Elle est munie à l'extrémité axiale opposée d'un embout 66 sur lequel s'articule la poignée 7, autour d'un axe de rotation coupant perpendiculairement l'axe W.The control screw 6 has a helical thread 60 extending along the axis W, engaged in the part forming the nut 8, and comprises at a axial end a shouldered head 61. It is provided at the axial end opposite of a tip 66 on which the handle 7 is articulated, about an axis of rotation perpendicularly cutting the W axis.

La tête épaulée 61 repose par sa tranche d'extrémité axiale 63 contre la surface 55 de la tête à et par son épaulement, référencé 64, sur une butée à billes 62 en appui sur une chape 9. Cette butée à billes 62 comporte, de façon connue en soi, deux bagues 62a, 62b d'axe W, définissant des chemins de roulement pour des billes 62c interposées entre les bagues 62a, 62b.The shouldered head 61 rests by its axial end edge 63 against the surface 55 of the head at and by its shoulder, referenced 64, on a ball bearing 62 bearing on a yoke 9. This ball bearing 62 comprises, in a manner known per se, two rings 62a, 62b of axis W, defining paths of bearing for balls 62c interposed between the rings 62a, 62b.

La chape 9 est représentée isolément sur les figures 6 à 8. Elle comporte deux flasques 90, plans et parallèles entre eux, réunis par une base 91. Cette dernière s'étend perpendiculairement au plan des flasques 90. Des perçages 92 d'axe Y sont ménagés sur les flasques 90 pour le passage du tourillon d'articulation 98 précité, et le montage à rotation de la chape 9 sur le bras de levage 4 autour de l'axe Y. La base 91 est traversée par un perçage 93 pour le passage de la vis de commande 6. La bague 62b de la butée à billes 62 repose contre la face 910 de la base 91 tournée vers l'espace intérieur aux flasques 90. Ces derniers sont ajourés en 94 comme représenté sur la figure 8 pour réaliser un gain de matière. Ils présentent, observés dans la direction de l'axe Y, un contour généralement triangulaire, délimité latéralement par deux bords rectilignes 95 convergeant en rapprochement de l'axe Y, ces bords 95 étant réunis à leur extrémité opposée à la base 91 par un bord 96 en arc de cercle, centré sur l'axe Y, et se raccordant à la base 91 par des bords rectilignes 97, parallèles à l'axe W.The yoke 9 is shown in isolation in Figures 6 to 8. It has two flanges 90, planes and parallel to each other, joined by a base 91. The latter extends perpendicular to the plane of the flanges 90. Des holes 92 of Y axis are provided on the flanges 90 for the passage of the articulation pin 98 above, and the rotational mounting of the yoke 9 on the lifting arm 4 around the axis Y. The base 91 is crossed by a bore 93 for the passage of the control screw 6. The ring 62b of the ball bearing 62 rests against the face 910 of the base 91 facing the interior space at flanges 90. These are perforated at 94 as shown in FIG. 8 to save material. They present, observed in the direction of the Y axis, a generally triangular contour, delimited laterally by two straight edges 95 converging towards the Y axis, these edges 95 being joined at their end opposite the base 91 by an edge 96 in arc of a circle, centered on the Y axis, and connecting to base 91 by edges rectilinear 97, parallel to the W axis.

On a représenté isolément sur les figures 9 à 14 le bras de levage 4. Ce dernier est réalisé de préférence par emboutissage, découpage et pliage d'une tôle pour former un profilé métallique allongé dans la direction d'un axe longitudinal V perpendiculaire aux axes X et Y. Ce profilé présente une section transversale ayant la forme générale d'un U, comme représenté plus particulièrement sur les figures 11 à 13. Il comporte deux ailes 40 réunies par un dos 41 s'étendant généralement perpendiculairement aux ailes 40. Des renfoncements oblongs 42 venus d'emboutissage s'étendent parallèlement à l'axe V sur les ailes 40 pour rigidifier le profilé. Ces renfoncements 42 forment saillie dans l'espace intérieur du profilé situé entre les ailes 40. Un renfoncement oblong 43, formant saillie vers l'intérieur, est réalisé sur le dos 41 dans le même but. Les ailes 40 sont percées à une extrémité longitudinale, en 44, pour le passage du tourillon 98 précité et l'assemblage en rotation de la tête 5, de la chape 9 et du bras de levage 4. Ces perçages 44 sont réalisés à une extrémité longitudinale des renfoncements 42. Les ailes 40 sont percées à l'extrémité longitudinale opposée, en 46, pour le passage d'un tourillon 28 d'axe X servant à l'articulation du bras de levage 4 sur la jambe d'appui 2. Ces perçages 46 sont réalisés sur des emboutis circulaires 47 formant saillie vers l'extérieur du profilé, comme montré plus particulièrement sur la figure 12. Ces emboutis circulaires 47 se situent dans le prolongement des renfoncements 42, ménageant un intervalle 470 avec ces derniers comme montré sur la figure 9. Le dos 41 est prolongé, à l'extrémité du bras de levage 4 articulée sur la jambe d'appui 2, par une paroi 48 s'étendant obliquement entre les ailes 40 et formant entretoise. La paroi 48 résulte d'un découpage et d'un pliage de la tôle utilisée pour réaliser le profilé, comme illustré sur la figure 14. Les extrémités longitudinales des ailes 40 présentent à l'extrémité s'articulant sur la jambe d'appui 2 un profil généralement triangulaire, observé dans la direction de l'axe X. Ce profil est délimité par deux bords rectilignes orthogonaux 401, 402 réunis par un bord en arc de cercle 403 centré sur l'axe X. Après pliage, la paroi 48 s'étend dans le plan des bords 401 et forme avec le dos 41 un dièdre d'angle au sommet 238°. FIGS. 9 to 14 show the lifting arm 4 in isolation. The latter is preferably produced by stamping, cutting and folding of a sheet to form an elongated metal profile in the direction of a longitudinal axis V perpendicular to the X and Y axes. This profile has a cross section having the general shape of a U, as shown more particularly in Figures 11 to 13. It has two wings 40 joined by a back 41 extending generally perpendicular to the wings 40. oblong recesses 42 from stamping extend parallel to the V axis on the wings 40 to stiffen the profile. These recesses 42 protrude into the interior space of the profile located between the wings 40. An oblong recess 43, projecting inwards, is produced on back 41 for the same purpose. The wings 40 are pierced at one end longitudinal, at 44, for the passage of the aforementioned pin 98 and the assembly in rotation of the head 5, of the yoke 9 and of the lifting arm 4. These holes 44 are made at a longitudinal end of the recesses 42. The wings 40 are drilled at the opposite longitudinal end, at 46, for the passage a pin 28 of axis X used for the articulation of the lifting arm 4 on the support leg 2. These holes 46 are made on circular stampings 47 projecting outwards from the profile, as shown more particularly in FIG. 12. These circular stampings 47 are located in the extension of the recesses 42, leaving an interval 470 with these as shown in Figure 9. The back 41 is extended, the end of the lifting arm 4 articulated on the support leg 2, by a wall 48 extending obliquely between the wings 40 and forming a spacer. The wall 48 results from cutting and bending the sheet metal used to make the profile, as shown in Figure 14. The longitudinal ends of the wings 40 have at the end articulated on the support leg 2 a profile generally triangular, observed in the direction of the X axis. This profile is delimited by two rectilinear orthogonal edges 401, 402 joined by an edge in an arc 403 centered on the axis X. After folding, the wall 48 extends in the plane of the edges 401 and forms with the back 41 a dihedral of angle at the top 238 °.

On a représenté isolément sur les figures 15 à 19 la pièce formant écrou 8. Cette dernière est réalisée, de préférence, en matière plastique. Elle comporte un corps 80 traversé selon l'axe W par un taraudage 81 adapté à recevoir le corps fileté 60 de la vis de commande 6. Des parties latérales 82 forment saillie de part et d'autre du corps 80 pour l'articulation de la pièce formant écrou 8 sur la jambe d'appui 2. Ces parties latérales 82 sont délimitées radialement, à l'extérieur, par des surfaces cylindriques de révolution autour de l'axe Z, et axialement par des tranches d'extrémité 83 planes et perpendiculaires à l'axe Z. La pièce formant écrou 8 comporte également deux pattes 84 traversées par des perçages 85 d'axe T parallèle à l'axe Z, pour le montage de moyens de retenue de la pièce formant écrou 8 sur la jambe d'appui 2, comme cela sera précisé plus loin. Les pattes 84 se raccordent sur le corps 80 en ménageant avec les surfaces cylindriques 82 des gorges annulaires 86 centrées sur l'axe Z. Le dièdre de sommet l'axe Z, délimité par le plan perpendiculaire à l'axe W et par le plan contenant l'axe T, est d'angle au sommet 60°.FIGS. 15 to 19 show separately the part forming nut 8. The latter is preferably made of plastic. She comprises a body 80 crossed along the axis W by a thread 81 adapted to receive the threaded body 60 of the control screw 6. Lateral parts 82 protrude on either side of the body 80 for the articulation of the part forming nut 8 on the supporting leg 2. These lateral parts 82 are delimited radially, on the outside, by cylindrical surfaces of revolution around from the Z axis, and axially by planar end sections 83 and perpendicular to the Z axis. The nut forming part 8 also comprises two tabs 84 crossed by holes 85 of axis T parallel to the axis Z, for mounting of means for retaining the piece forming a nut 8 on the leg support 2, as will be explained below. The legs 84 are connected to the body 80 with the grooves 82 of the grooves annulars 86 centered on the Z axis. The apex dihedral Z axis, delimited by the plane perpendicular to the W axis and by the plane containing the T axis, is at an angle summit 60 °.

On a représenté isolément sur les figures 24 à 29 la jambe d'appui 2. Cette dernière est réalisée de préférence par emboutissage, découpage et pliage d'une tôle pour former un profilé allongé selon un axe longitudinal G perpendiculaire à l'axe Z. Ce profilé présente une section transversale ayant la forme générale d'un U, comportant deux ailes 20 réunies par un dos 21. Chaque aile 20 présente un renfoncement oblong 22 venu d'emboutissage, formant saillie dans l'espace intérieur du profilé situé entre les ailes 20, et destiné à rigidifier le profilé.FIGS. 24 to 29 show the support leg 2 in isolation. The latter is preferably carried out by stamping, cutting and folding of a sheet to form an elongated profile along a longitudinal axis G perpendicular to the Z axis. This profile has a cross section having the general shape of a U, comprising two wings 20 joined by a back 21. Each wing 20 has an oblong recess 22 coming from stamping, projecting into the interior space of the profile located between the wings 20, and intended to stiffen the profile.

Le pied 3 est formé par découpage et pliage comme illustré sur la figure 29. Plus précisément, le pied 3 comporte une première paroi plane 30 se raccordant au dos 21 par une ligne de pliage 31 et formant, en position assemblée du cric, un angle de 43° avec le dos 21 comme représenté sur la figure 24. Cette paroi 30 est prolongée vers le bas par une paroi plane 32 destinée à servir de surface d'appui sur le sol. On a référencé 33 la ligne de pliage s'étendant à la jonction des parois 30 et 32. Le dièdre ayant pour sommet la ligne de pliage 33 et délimité par les plans des parois 30 et 32 a un angle au sommet de 142°. La paroi 30 s'élargit en éloignement du dos 21 jusqu'à atteindre une largeur environ double de celle du dos 21 au niveau de la ligne de pliage 33. La largeur de la paroi 32 est constante. Cette dernière repose, par sa face opposée à celle venant en appui sur le sol, contre la tranche des ailes 20. The foot 3 is formed by cutting and folding as illustrated in the Figure 29. More specifically, the foot 3 has a first planar wall 30 connecting to the back 21 by a fold line 31 and forming, in position jack assembly, an angle of 43 ° with the back 21 as shown in the Figure 24. This wall 30 is extended downwards by a flat wall 32 intended to serve as a bearing surface on the ground. We have referenced 33 the line of folding extending to the junction of the walls 30 and 32. The dihedral having for vertex the fold line 33 and delimited by the planes of the walls 30 and 32 has a angle at the summit of 142 °. The wall 30 widens away from the back 21 until reaching a width approximately double that of the back 21 at the level of the fold line 33. The width of the wall 32 is constant. This last rests, by its face opposite to that coming to bear on the ground, against the wing edge 20.

Les bords libres 23 des ailes 20 sont recourbés vers l'extérieur comme représenté plus particulièrement sur les sections transversales des figures 27 et 28, à des fins de rigidification du profilé. La section transversale de la jambe d'appui 2 est généralement constante depuis le pied 3 jusqu'à la moitié environ de la hauteur de la jambe d'appui 2, où la largeur des ailes 20 augmente et devient maximum à hauteur d'un perçage 24 servant au passage du tourillon 28 d'articulation du bras de levage 4. La largeur des ailes 20 décroít ensuite jusqu'à hauteur des extrémités longitudinales supérieures 26 des renfoncements 22, où les ailes 20 forment des encoches 211. Le dos 21 s'interrompt à hauteur de ces encoches 211. La largeur des ailes 20 augmente au-dessus des encoches 211 en direction de l'extrémité supérieure de la jambe d'appui 2, située à l'opposé du pied 3, jusqu'à des évidements 25 ménagés sur les ailes 20, servant de paliers d'articulation autour de l'axe Z à la pièce formant écrou 8. Sur la portion des ailes 20 s'étendant entre les extrémités supérieures 26 des renfoncements oblongs 22 et le plan contenant l'axe Z et perpendiculaire à l'axe longitudinal G, sont ménagées des lumières curvilignes 27. Ces dernières participent à la retenue de la pièce formant écrou dans les évidements 25. Le dos 21 forme, à hauteur des perçages 24, un dièdre saillant vers l'extérieur, d'angle au sommet 152°. Les bords 23 s'étendent rectilignement, parallèlement aux renfoncements 22, depuis leur extrémité inférieure en appui contre la paroi 32 jusqu'au plan contenant l'axe Z et perpendiculaire à l'axe G. Les bords 23 se prolongent, au-delà de ce plan, selon des arcs de cercle 230 et se terminent par des portions rectilignes 231 perpendiculaires à l'axe G.The free edges 23 of the wings 20 are curved outwards as shown more particularly on the cross sections of Figures 27 and 28, for the purpose of stiffening the profile. Cross section of the supporting leg 2 is generally constant from the foot 3 to the about half the height of the supporting leg 2, where the width of the wings 20 increases and becomes maximum up to a hole 24 used for passage of the pivot 28 of the articulation of the lifting arm 4. The width of the wings 20 then decreases to the height of the upper longitudinal ends 26 recesses 22, where the wings 20 form notches 211. The back 21 stops at the height of these notches 211. The width of the wings 20 increases above the notches 211 towards the upper end of the leg support 2, located opposite foot 3, to recesses 25 formed on the wings 20, serving as articulation bearings around the axis Z to the part forming a nut 8. On the portion of the wings 20 extending between the ends upper 26 of the oblong recesses 22 and the plane containing the Z axis and perpendicular to the longitudinal axis G, are provided lights 27. These latter participate in the retention of the part forming nut in the recesses 25. The back 21 forms, at the height of the holes 24, a dihedral projecting outwards, from angle to summit 152 °. The edges 23 extend straight, parallel to the recesses 22, from their lower end resting against the wall 32 up to the plane containing the Z axis and perpendicular to the G axis. The edges 23 extend beyond this plane, in arcs of circle 230 and end in rectilinear portions 231 perpendicular to the G axis.

Les évidements 25 présentent, comme représenté sur la figure 24, des bords en forme de demi-cercle 250, centrés sur l'axe Z et de rayon adapté à celui des surfaces cylindriques 82. Ces bords demi-circulaires 250 sont prolongés inférieurement par des bords rectilignes 251 perpendiculaires à l'axe longitudinal G, et supérieurement, par des bords rectilignes 252 s'étendant parallèlement aux bords 251 mais sur une distance correspondant à un quart environ de la longueur des bords rectilignes 25l. Les bords 250, 251 et 252 sont recourbés vers l'espace intérieur situé entre les ailes 20 pour former des surfaces de portée 253 venant au contact des surfaces cylindriques 82 de la pièce formant écrou 8. Ces surfaces de portée 253 sont de génératrice parallèle à l'axe Z. Les évidements 25 définissent des gorges dont le fond est constitué par les bords demi-circulaires 250 et dont la largeur d'ouverture, c'est-à-dire la distance séparant les bords rectilignes 251 et 252, est au moins égale au diamètre des bords demi-circulaires 250.The recesses 25 have, as shown in FIG. 24, edges in the shape of a semicircle 250, centered on the Z axis and of radius adapted to that of the cylindrical surfaces 82. These semicircular edges 250 are extended below by straight edges 251 perpendicular to the longitudinal axis G, and above, by rectilinear edges 252 extending parallel to the edges 251 but over a corresponding distance about a quarter of the length of the straight edges 25l. Edges 250, 251 and 252 are bent towards the interior space located between the wings 20 to form bearing surfaces 253 coming into contact with the surfaces cylindrical 82 of the nut-forming part 8. These bearing surfaces 253 are of generator parallel to the Z axis. The recesses 25 define grooves whose the bottom is constituted by the semicircular edges 250 and whose width opening, that is to say the distance separating the straight edges 251 and 252, is at least equal to the diameter of the semicircular edges 250.

Chaque lumière curviligne 27 s'étend selon une ligne médiane K en arc de cercle située à la même distance de l'axe Z que la distance séparant ce dernier et l'axe T des perçages 85, et présente à ses extrémités longitudinales des bords demi-circulaires 270 et 271. Le dièdre ayant pour sommet l'axe Z, délimité par les plans contenant les axes des bords demi-circulaires 270 et 271, est d'angle au sommet 115°. Le plan contenant l'axe Z et l'axe des perçages demi-circulaires 270 s'étend parallèlement aux bords rectilignes 251.Each curvilinear lumen 27 extends along a midline K in an arc located at the same distance from the Z axis as the distance between the latter and the axis T of the holes 85, and has at its ends longitudinal of the semicircular edges 270 and 271. The dihedral having for vertex the Z axis, delimited by the planes containing the axes of the semicircular edges 270 and 271, is at an angle at the top 115 °. The plane containing the Z axis and the axis of the semi-circular holes 270 extends parallel to the edges straight 251.

Le montage de la pièce formant écrou 8 sur la jambe d'appui 2 s'effectue aisément, en engageant la pièce formant écrou 8 munie de la vis de commande 6 dans les évidements 25, jusqu'à butée des surfaces cylindriques 82 contre les bords demi-circulaires 250. L'introduction de la pièce formant écrou 8 peut s'effectuer par un simple mouvement de translation dans une direction perpendiculaire à l'axe Z et convient à une exécution mécanisée. Les perçages 85 des pattes 84 de la pièce formant écrou 8 sont alors positionnés en regard des lumières curvilignes 27. Un rivet 89 est introduit dans les lumières curvilignes 27 et les perçages 85 pour retenir la pièce formant écrou 8 sur la jambe d'appui 2. Après l'opération de rivetage, le rivet 89 vient axialement en appui à ses extrémités axiales sur la surface externe 200 des ailes 20 bordant les lumières curvilignes 27.The mounting of the nut-forming part 8 on the support leg 2 is easily carried out by engaging the nut forming part 8 provided with the screw control 6 in the recesses 25, up to the stop of the cylindrical surfaces 82 against the semicircular edges 250. The introduction of the part forming nut 8 can be made by a simple translational movement in a direction perpendicular to the Z axis and suitable for execution mechanized. The holes 85 of the tabs 84 of the piece forming the nut 8 are then positioned opposite the curved lights 27. A rivet 89 is introduced into the curved lights 27 and the holes 85 to retain the nut forming part 8 on the supporting leg 2. After the riveting operation, the rivet 89 comes to bear axially at its axial ends on the surface external 200 of the wings 20 bordering the curvilinear lights 27.

Le fonctionnement du cric 1 est le suivant.The operation of jack 1 is as follows.

A l'état replié, comme montré sur les figures 20, 21 et 23, le bras de levage 4 se rabat entre les ailes 20 de la jambe d'appui 2, la tête à venant en butée par les surfaces d'arrêt 520 sur les bords recourbés 23. Dans la position repliée du cric 1, la tranche d'extrémité 63 de la vis de commande 6 repose sur l'extrémité de la surface cylindrique 55 adjacente au doigt 53, comme représenté plus particulièrement sur la figure 23. La poignée 7 peut avantageusement se rabattre contre la surface externe d'une aile 20 comme montré sur la figure 21. Le rivet 89 bute contre les bords demi-circulaires 271.In the folded state, as shown in Figures 20, 21 and 23, the arm of lifting 4 folds down between the wings 20 of the supporting leg 2, the head coming in stop by the stop surfaces 520 on the curved edges 23. In the position folded back from the jack 1, the end edge 63 of the control screw 6 rests on the end of the cylindrical surface 55 adjacent to the finger 53, as shown more particularly in Figure 23. The handle 7 can advantageously fall back against the external surface of a wing 20 as shown in Figure 21. Rivet 89 abuts the semi-circular edges 271.

Pour déplier le cric 1, l'utilisateur tourne la poignée 7 et entraíne en rotation la vis de commande 6 autour de l'axe W. Le déplacement longitudinal de la vis de commande 6 qui résulte de sa rotation dans le taraudage 81 provoque un pivotement du bras de levage 4 dans le sens horaire sur la figure 1 et le déplacement vers le haut de la tête 5. La rotation du bras de levage 4 s'accompagne d'un déplacement du rivet 89 dans les lumières curvilignes 27 jusqu'à butée de ce dernier contre les bords demi-circulaires 270. Le cric 1 est alors dans sa position de levage maximum et la vis de commande est soumise à des efforts de traction lorsque le cric est en charge. Les surfaces 540 et 541 sont normalement orientées verticalement en position de levage du véhicule, comme représenté sur la figure 1, et la surface frontale 63 de la butée à billes 62 est alors située à l'extrémité de la surface cylindrique 55 la plus éloignée des doigts 52 et 53. Toute rotation supplémentaire de la tête à dans le sens anti-horaire est empêchée par butée des extrémités inférieures 521 des surfaces d'arrêt 520 contre les tranches d'extrémité 201 des ailes 20, comme illustré sur la figure 22 plus particulièrement.To unfold the jack 1, the user turns the handle 7 and drives in rotation the control screw 6 around the axis W. The displacement longitudinal of the control screw 6 which results from its rotation in the internal thread 81 causes the lifting arm 4 to pivot in the direction time in Figure 1 and the upward movement of the head 5. The rotation of the lifting arm 4 is accompanied by a displacement of the rivet 89 in the curvilinear lights 27 until the latter stops against the semi-circular edges 270. Jack 1 is then in its maximum lifting position and the control screw is subjected to tensile forces when the jack is in charge. The surfaces 540 and 541 are normally oriented vertically in the vehicle lifting position, as shown in Figure 1, and the front surface 63 of the ball stop 62 is then located at the end of the cylindrical surface 55 furthest from the fingers 52 and 53. Any rotation additional head to counterclockwise is prevented by stopper lower ends 521 of stop surfaces 520 against edges end 201 of the wings 20, as illustrated in FIG. 22 more particularly.

Pour replier le cric 1, l'utilisateur tourne la vis de commande 6. Tant que le cric 1 soulève le véhicule, c'est-à-dire travaille en charge, la vis de commande 6 travaille en traction et la butée à billes 62 est sollicitée axialement en compression. Lorsque le cric a été suffisamment replié et ne soulève plus le véhicule, c'est-à-dire travaille à vide, la vis de commande 6 vient axialement en butée par la tranche d'extrémité 63 contre la surface 55 de la tête 5. On assure ainsi l'entraínement du bras de levage 4 sans utiliser de fourreau d'arrêt engagé sur la vis de commande comme c'est le cas sur les crics connus.To fold the jack 1, the user turns the control screw 6. As long as jack 1 lifts the vehicle, i.e. works under load, the screw control 6 works in tension and the thrust ball 62 is stressed axially in compression. When the jack has been folded enough and does not no longer lifts the vehicle, i.e. works when empty, control screw 6 axially abuts by the end edge 63 against the surface 55 of the head 5. This ensures the training of the lifting arm 4 without using stop sleeve engaged on the control screw as is the case on known jacks.

Finalement, un cric selon l'invention présente un encombrement en position repliée suffisamment faible pour son logement dans une jante de roue de secours, notamment grâce à l'agencement particulier de la vis de commande 6 sur le cric 1. L'assemblage du cric s'effectue aisément et peut être exécuté par un robot. Le positionnement des axes de rotation X, Y et Z, notamment l'intersection des axes W et Y est avantageux du point de vue cinématique. Le rivet 89 accroít la sécurité d'utilisation du cric en empêchant les ailes de la jambe d'appui 2 de s'écarter. Un fourreau d'arrêt n'est pas nécessaire et la libre rotation de la tête à sur le bras de levage 4 diminue le risque d'endommagement de la caisse du véhicule en cas de mauvais positionnement du cric.Finally, a jack according to the invention has a space requirement in the folded position sufficiently weak for its accommodation in a rim of spare wheel, in particular thanks to the special arrangement of the bolt control 6 on the jack 1. The jack is assembled easily and can be executed by a robot. The positioning of the axes of rotation X, Y and Z, in particular the intersection of the W and Y axes is advantageous from the point of kinematic view. Rivet 89 increases the safety of using the jack preventing the wings of the supporting leg 2 from spreading. A stop sleeve is not necessary and the free rotation of the head to on the lifting arm 4 reduces the risk of damage to the vehicle body in the event of improper positioning of the jack.

Claims (9)

  1. A vehicle jack (1) comprising a prop leg (2) and a lifting arm (4) pivotally mounted to the leg, for displacement by means of a control screw (6) rotating in a nut-forming part (8) received in hinged manner in recesses (25) of the prop leg (2), the nut-forming part (8) being retained on the prop leg by a retaining element (89) secured to the nut-forming part (8), the jack being characterized in that the retaining element is engaged on the prop leg in at least one curvilinear slot (27) formed in the prop leg (2) and centered on the pivot axis (Z) between the nut-forming part (8) and the prop leg (2).
  2. A jack according to claim 1, characterized in that each recess (25) of the prop leg (2) receiving the nut-forming part (8) constitutes a groove whose bottom wall is defined by a semicircular edge (250) and whose opening is of a width that is greater than or equal to the diameter of said semicircular edge.
  3. A jack according to claim 1 or 2, the prop leg (2) being generally in the form of a channel section bar, the jack being characterized in that said retaining element is a rivet (89) bearing axially on the outside faces of the two flanges (20) of the bar.
  4. A jack according to any one of claims 1 to 3, the prop leg (2) having the general form of a channel section bar, the jack being characterized in that the walls of the flanges of said bar adjacent to said recesses (25) are curved so as to increase the contact bearing surface area of the nut-forming part (8).
  5. A jack according to any one of claims 1 to 4, the jack including a jack head designed to come into contact with the vehicle, the jack being characterized in that the jack head is disposed in line with the control screw such that the screw bears axially against the jack head at least during operation of the jack when it is unloaded and when the control screw is actuated in the direction that tends to fold the jack.
  6. A jack according to claim 5, characterized in that it includes a jack head (5) hinged to the lifting arm (4) about a hinge axis (Y) perpendicularly intersecting the longitudinal axis (W) of the control screw (6).
  7. A jack according to any one of claims 1 to 6, characterized in that the control screw (6) has a shouldered head (61) resting against a ball abutment (62) at least when the jack is being operated and is under load.
  8. A jack according to claim 7, characterized in that the ball abutment (62) is received in a fork (9) hinged to the lifting arm (4).
  9. A jack according to claim 8, characterized in that the fork (9) is mounted to rotate about the same axis of rotation (Y) as the jack head (5).
EP19960400669 1995-03-31 1996-03-28 Easy assembly vehicle jack Expired - Lifetime EP0734996B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9503832A FR2732325B1 (en) 1995-03-31 1995-03-31 VEHICLE JACK WITH SIMPLIFIED ASSEMBLY
FR9503832 1995-03-31

Publications (2)

Publication Number Publication Date
EP0734996A1 EP0734996A1 (en) 1996-10-02
EP0734996B1 true EP0734996B1 (en) 2000-05-31

Family

ID=9477634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960400669 Expired - Lifetime EP0734996B1 (en) 1995-03-31 1996-03-28 Easy assembly vehicle jack

Country Status (3)

Country Link
EP (1) EP0734996B1 (en)
DE (1) DE69608603D1 (en)
FR (1) FR2732325B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2129311B1 (en) * 1996-01-22 2000-05-01 Batz S Coop Ltada VEHICLE JACK.
DE10053860B4 (en) * 2000-10-31 2010-10-28 Brano Wagenheber Gmbh Movement nut for a lifting device and lifting device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176458B (en) * 1985-05-10 1989-07-05 Metallifacture Ltd Vehicle jack
DE69222755T3 (en) * 1992-04-14 2001-03-15 Aries Ind Mecanismes Et Decoup Jack

Also Published As

Publication number Publication date
FR2732325B1 (en) 1997-06-20
EP0734996A1 (en) 1996-10-02
FR2732325A1 (en) 1996-10-04
DE69608603D1 (en) 2000-07-06

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