EP0178998A1 - Jack-type lifting device for a vehicle - Google Patents

Jack-type lifting device for a vehicle Download PDF

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Publication number
EP0178998A1
EP0178998A1 EP85402007A EP85402007A EP0178998A1 EP 0178998 A1 EP0178998 A1 EP 0178998A1 EP 85402007 A EP85402007 A EP 85402007A EP 85402007 A EP85402007 A EP 85402007A EP 0178998 A1 EP0178998 A1 EP 0178998A1
Authority
EP
European Patent Office
Prior art keywords
lifting
jack
base
parallelogram
respect
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.)
Granted
Application number
EP85402007A
Other languages
German (de)
French (fr)
Other versions
EP0178998B1 (en
Inventor
Maurice Silard
Maurice Fallour
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0178998A1 publication Critical patent/EP0178998A1/en
Application granted granted Critical
Publication of EP0178998B1 publication Critical patent/EP0178998B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, 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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/12—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated comprising toggle levers

Abstract

1. A lifting device of the jack type (1) which is intended in particular for lifting a motor vehicle, comprising a parallelogram assembly essentially formed by a lifting head which is fixed with respect to two upper arms (2, 3) and two lower arms (4, 5) resting on a base (24) and actuated by an actuating device which is inclined with respect to a base plate (25) of the base, said lower arms pivoting respectively about lower spindles (12, 13) mounted in the base, the distance of one of the lower spindles (12) with respect to the base plate being smaller than that of the other spindle (13) so that the axis B of the parallelogram is inclined with respect to the vertical at the side of the lower spindle which is disposed closest to the base plate, characterised in that the lifting head (19) with its support face (20) is displaced by a value (A) with respect to the axis (B) of the parallelogram on the side opposite to that comprising the lower spindle which is disposed closest to the base plate in order to prevent a tilting moment of the jack when said jack (1) is in the operative lifting position.

Description

La présente invention est relative à un dispositif de levage du type cric destiné notamment à soulever des véhicules automobiles et concernant plus particulièrement les crics à parallélogrammes.The present invention relates to a lifting device of the jack type intended in particular for lifting motor vehicles and more particularly relating to jacks with parallelograms.

Les crics du type à parallélogramme sont constitués d'un ensemble à parallélogramme reposant sur un socle et portant une tête de levage destinée à supporter la charge. L'ensemble à parallélogramme est commandé par un dispositif de manoeuvre qui est constitué d'une vis de manoeuvre munie d'une chape d'entraînement. Une manivelle vient s'engager dans cette chape pour soulever ou descendre la charge.Parallelogram type jacks consist of a parallelogram assembly resting on a base and carrying a lifting head intended to support the load. The parallelogram assembly is controlled by an operating device which consists of an operating screw provided with a drive yoke. A crank engages in this yoke to raise or lower the load.

Afin de pouvoir faire tourner la vis de manoeuvre à l'aide de la manivelle il faut alors :

  • - soit conserver une vis de manoeuvre parallèle au plan d'appui du socle sur le sol, d'où l'obligation de tourner la manivelle par demi-tours successifs car l'espace disponible par rapport au sol est insuffisant,
  • - soit prévoir une vis de manoeuvre inclinée par rapport au plan d'appui du socle sur le sol afin de permettre un dégagement de la poignée de manivelle et de pouvoir effectuer des rotations complètes.
In order to be able to turn the operating screw using the crank, you must:
  • - either keep an operating screw parallel to the support plane of the base on the ground, hence the obligation to turn the crank by successive half-turns because the space available relative to the ground is insufficient,
  • - Either provide a maneuvering screw inclined relative to the support plane of the base on the ground in order to allow a release of the crank handle and to be able to perform complete rotations.

Dans ce dernier cas, cette inclinaison de la vis de manoeuvre entraîne un moment de basculement lors de la levée du véhicule. Ce défaut est aggravé lorsque le sol n'a pas un très grand coefficient d'adhérence. Il y a alors un risque très grand de ripage du véhicule, qui peut entraîner le cric.In the latter case, this inclination of the maneuvering screw causes a tilting moment when the vehicle is lifted. This defect is aggravated when the ground does not have a very high coefficient of adhesion. There is then a very great risk of the vehicle slipping, which can cause the jack.

De plus, ce moment de basculement entraîne des efforts supplémentaires dans le cric, notamment sur les segments dentés d'entraînement du parallélogramme.In addition, this tilting moment causes additional forces in the jack, especially on the toothed parallelogram drive segments.

Pour éviter au véhicule de riper, on pourrait envisager de prévoir un socle avec une semelle de très grandes dimensions qui absorberont alors ce moment de basculement. Dans ce dernier cas, on aurait alors un dispositif extrêmement encombrant, coûteux et difficile à placer dans le véhicule.To avoid the vehicle from ripping, one could consider providing a base with a very large sole which will then absorb this tilting moment. In the latter case, there would then be an extremely bulky device, expensive and difficult to place in the vehicle.

De plus, il y aurait toujours un effort de déformation sur les segments dentés du parallélogramme.In addition, there would always be a deformation stress on the toothed segments of the parallelogram.

Le but de la présente invention est de proposer un cric à parallélogramme qui soit commandé par un dispositif de manoeuvre incliné et qui soit parfaitement équilibré.The object of the present invention is to provide a parallelogram jack which is controlled by an inclined operating device and which is perfectly balanced.

Selon un mode de réalisation de l'invention, le dispositif de levage du type cric, destiné notamment à soulever un véhicule automobile comporte un ensemble à parallélogramme constitué essentiellement par des bras reposant sur un socle et portant une tête de levage et commandé par un dispositif de manoeuvre incliné par rapport à la semelle du socle. Dans le dispositif selon l'invention, la tête de levage a sa face d'appui qui est décalée par rapport à l'axe du parallélogramme afin d'éviter un moment de basculement du véhicule lorsque le cric est en position utile de levée du véhicule.According to one embodiment of the invention, the jack-type lifting device, intended in particular for lifting a motor vehicle comprises a parallelogram assembly consisting essentially of arms resting on a base and carrying a lifting head and controlled by a device maneuver inclined relative to the base of the base. In the device according to the invention, the lifting head has its bearing face which is offset relative to the axis of the parallelogram in order to avoid a moment of tilting of the vehicle when the jack is in the useful position for lifting the vehicle. .

Selon un mode de réalisation de l'invention, la tête de levage est constituée de deux flancs parallèles qui sont reliés par la face d'appui, ladite face d'appui étant munie d'une extrémité d'engagement.According to one embodiment of the invention, the lifting head consists of two parallel sides which are connected by the bearing face, said bearing face being provided with an engagement end.

Selon un mode de réalisation de l'invention, le dispositif de manoeuvre est constitué d'une vis de manoeuvre qui coopère avec des tourillons, ladite vis de manoeuvre étant munie d'un organe de butée.According to one embodiment of the invention, the operating device consists of an operating screw which cooperates with pins, said operating screw being provided with a stop member.

Selon un mode de réalisation de l'invention, le socle comporte des trous destinés à recevoir les axes inférieurs, ces trous sont positionnés par rapport à la semelle de façon à obtenir l'inclinaison voulue pour la vis de manoeuvre.According to one embodiment of the invention, the base comprises holes intended to receive the lower axes, these holes are positioned relative to the sole so as to obtain the desired inclination for the operating screw.

Le dispositif de levage selon l'invention permet ainsi de tourner facilement la vis de manoeuvre du fait que celle-ci est inclinée. De plus, il évite tout moment de basculement, donc il ne présente pas d'effort parasite, notamment sur les segments dentés qui ne se déforment pas. Par ailleurs, lorsque l'on est en présence d'un sol à faible coefficient d'adhérence, il n'y a pas de risque de ripage du véhicule et du cric car l'ensemble est parfaitement stable.The lifting device according to the invention thus allows the maneuvering screw to be easily turned because it is inclined. In addition, it avoids any tilting moment, therefore it does not present any parasitic force, in particular on the toothed segments which do not deform. Furthermore, when there is a soil with a low coefficient of grip, there is no risk of the vehicle and the jack slipping because the assembly is perfectly stable.

L'invention sera mieux comprise par l'étude d'un mode de réalisation particulier décrit à titre nullement limitatif et illustré par les dessins annexés, sur lesquels :

  • - la figure 1 est une vue longitudinale du cric selon l'invention, ce cric est représenté dans les deux positions extrêmes basse et haute,
  • - la figure 2 est une vue en perspective cavalière du cric représenté sur la figure 1,
  • - la figure 3 est une vue en perspective cavalière de la tête de levage du cric représenté sur la figure 2.
The invention will be better understood by studying a particular embodiment described in no way limiting and illustrated by the appended drawings, in which:
  • FIG. 1 is a longitudinal view of the jack according to the invention, this jack is shown in the two extreme low and high positions,
  • FIG. 2 is a perspective view of the jack shown in FIG. 1,
  • FIG. 3 is a perspective view of the jack lifting head shown in FIG. 2.

Le dispositif de levage ou cric 1 comprend un ensemble à parallélogramme qui repose sur un socle 24 et qui porte une tête de levage 19. Cet ensemble à parallélogramme est commandé par un dispositif de manoeuvre qui est incliné par rapport au sol, c'est-à-dire par rapport à la semelle 25 du socle 24.The lifting device or jack 1 comprises a parallelogram assembly which rests on a base 24 and which carries a lifting head 19. This parallelogram assembly is controlled by an operating device which is inclined relative to the ground, that is to say that is to say with respect to the sole 25 of the base 24.

L'ensemble à parallélogramme est constitué de quatre bras : deux bras supérieurs 2 et 3 et deux bras inférieurs 4 et 5. Les deux bras supérieurs 2 et 3 s'articulent respectivement autour des axes supérieurs 10 et 11, qui sont montés sur la tête de levage 19 à l'aide des trous respectifs 10a et lla. Les deux bras inférieurs 4 et 5 s'articulent respectivement autour des axes inférieurs 12 et 13 qui sont montés dans le socle 24 à l'aide des trous respectifs 12a et 13a.The parallelogram assembly consists of four arms: two upper arms 2 and 3 and two lower arms 4 and 5. The two upper arms 2 and 3 are articulated respectively around the upper axes 10 and 11, which are mounted on the head lifting 19 using the respective holes 10a and 11a. The two lower arms 4 and 5 are articulated respectively around the lower axes 12 and 13 which are mounted in the base 24 using the respective holes 12a and 13a.

Les bras supérieurs 2 et 3 sont reliés respectivement aux bras inférieurs 4 et 5 par des tourillons 17 et 18, le bras supérieur 2 s'articulant avec le bras inférieur 4 au moyen du tourillon 17 et le bras supérieur 3 s'articulant avec le bras inférieur 5 au moyen du tourillon 18.The upper arms 2 and 3 are respectively connected to the lower arms 4 and 5 by pins 17 and 18, the upper arm 2 hinging with the lower arm 4 by means of the pin 17 and the upper arm 3 hinging with the arm lower 5 by means of the pin 18.

Afin d'éviter tout mouvement intempestif des bras, les deux bras supérieurs 2 et 3 sont munis respectivement de segments dentés 6 et 7 qui engrènent l'un avec l'autre.In order to avoid any untimely movement of the arms, the two upper arms 2 and 3 are respectively provided with toothed segments 6 and 7 which mesh with each other.

De même, les deux bras inférieurs 4 et 5 sont munis respectivement de segments dentés 8 et 9 qui engrènent l'un avec l'autre.Similarly, the two lower arms 4 and 5 are respectively provided with toothed segments 8 and 9 which mesh with each other.

Le socle 24 est une pièce d'un seul bloc avec une semelle 25 qui porte deux flancs verticaux 26 et 27. Sur chacun de ces flancs 26 et 27 sont aménagés un trou 12a et un trou 13a.The base 24 is a single piece with a sole 25 which carries two vertical sides 26 and 27. On each of these sides 26 and 27 are provided a hole 12a and a hole 13a.

De plus, les trous 12a sont situés, par rapport à la semelle 25, à une distance qui est plus faible que celle des trous 13a.In addition, the holes 12a are located, relative to the sole 25, at a distance which is less than that of the holes 13a.

Cette différence de position entre les trous 12a et 13a est déterminée de façon à obtenir l'inclinaison voulue pour le dispositif de manoeuvre.This difference in position between the holes 12a and 13a is determined so as to obtain the desired inclination for the operating device.

La tête de levage 19 est monobloc et est constituée d'une face d'appui 20 qui relie deux flancs parallèles verticaux 21 et 22.The lifting head 19 is in one piece and consists of a bearing face 20 which connects two vertical parallel sides 21 and 22.

Sur chacun de ces flancs 21 et 22 sont aménagés un trou 10a et un trou lla. Les trous 10a doivent être situés par rapport à la face d'appui 20, à une distance qui est plus grande que celle des trous lia. Cette différence de position est déterminée de façon à obtenir l'inclinaison voulue pour le dispositif de manoeuvre.On each of these sides 21 and 22 are provided a hole 10a and a hole lla. The holes 10a must be located relative to the support face 20, at a distance which is greater than that of the holes 11a. This difference in position is determined so as to obtain the desired inclination for the operating device.

La face d'appui 20 est décalée d'une valeur A par rapport à l'axe B du parallélogramme afin d'éviter un moment de basculement du véhicule lorsque le cric 1 est en position utile de levée du véhicule. De plus, la tête de levage 19 comporte une extrémité d'engagement 23 qui est liée à la face d'appui 20.The bearing face 20 is offset by a value A relative to the axis B of the parallelogram in order to avoid a moment of tilting of the vehicle when the jack 1 is in the useful position for lifting the vehicle. In addition, the lifting head 19 has an engagement end 23 which is linked to the bearing face 20.

Le dispositif de manoeuvre comprend une vis de manoeuvre 14 qui se termine par une chape d'entraînement 15 permettant de faire tourner la vis de manoeuvre 14 au moyen d'une manivelle non représentée.The operating device comprises an operating screw 14 which ends in a drive yoke 15 making it possible to rotate the operating screw 14 by means of a crank not shown.

Cette vis de manoeuvre 14 est vissée dans le tourillon 17 et traverse librement le tourillon 18. Ce tourillon 18 s'applique contre un organe de butée 16 de la vis de manoeuvre 14.This maneuvering screw 14 is screwed into the pin 17 and freely crosses the pin 18. This pin 18 is applied against a stop member 16 of the maneuver screw 14.

Claims (5)

1. Dispositif de levage du type cric (1) destiné notamment à soulever un véhicule automobile, comportant un ensemble à parallélogramme constitué essentiellement par des bras (2), (3), (4) et (5) reposant sur un socle (24), portant une tête de levage (19) et commandé par un dispositif de manoeuvre incliné par rapport à la semelle (25) du socle (24), caractérisé en ce que la tête de levage (19) qui a sa face d'appui (20) qui est décalée d'une valeur A par rapport à l'axe B du parallélogramme, afin d'éviter un moment de basculement du cric lorsque ledit cric (1) est en position utile de levée du véhicule.1. Lifting device of the jack type (1) intended in particular for lifting a motor vehicle, comprising a parallelogram assembly essentially constituted by arms (2), (3), (4) and (5) resting on a base (24 ), carrying a lifting head (19) and controlled by an operating device inclined relative to the base (25) of the base (24), characterized in that the lifting head (19) which has its bearing face (20) which is offset by a value A relative to the axis B of the parallelogram, in order to avoid a moment of tilting of the jack when said jack (1) is in the useful position for lifting the vehicle. 2. Dispositif de levage selon la revendication 1 caractérisé en ce que la face d'appui (20) est munie d'une extrémité d'engagement (23).2. Lifting device according to claim 1 characterized in that the bearing face (20) is provided with an engagement end (23). 3. Dispositif de levage selon l'une quelconque des revendications précédentes caractérisé en ce que la tête de levage (19) est constituée de deux flancs parallèles (21) et (22) qui sont reliés par la face d'appui (20), les flancs (21) et (22) comportant des trous (10a) qui sont situés par rapport à la face d'appui (20) à une distance plus grande que les trous (lla), de façon à obtenir l'inclinaison voulue pour le dispositif de manoeuvre.3. Lifting device according to any one of the preceding claims, characterized in that the lifting head (19) consists of two parallel sides (21) and (22) which are connected by the bearing face (20), the sides (21) and (22) having holes (10a) which are located relative to the bearing face (20) at a greater distance than the holes (lla), so as to obtain the desired inclination for the operating device. 4. Dispositif de levage selon la revendication 3 caractérisé en ce que le socle (24) comporte des trous (12a) qui sont situés, par rapport à la semelle (25), à une distance plus faible que les trous (13a), de façon à obtenir l'inclinaison voulue pour le dispositif de manoeuvre.4. Lifting device according to claim 3 characterized in that the base (24) has holes (12a) which are located, relative to the sole (25), at a smaller distance than the holes (13a), so as to obtain the desired inclination for the operating device. 5. Dispositif de levage selon l'une quelconque des revendications précédentes caractérisé en ce que le dispositif de manoeuvre est constitué d'une vis de manoeuvre (14) qui coopère avec les tourillons (1γ et (18), ladite vis de manoeuvre (14) étant munie d'un organe de butée (16).5. Lifting device according to any one of the preceding claims, characterized in that the operating device consists of an operating screw (14) which cooperates with the pins (1γ and (18), said operating screw (14 ) being provided with a stop member (16).
EP19850402007 1984-10-16 1985-10-16 Jack-type lifting device for a vehicle Expired EP0178998B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8415811A FR2571708B1 (en) 1984-10-16 1984-10-16 VEHICLE LIFTING DEVICE OF THE "JACK" TYPE
FR8415811 1984-10-16

Publications (2)

Publication Number Publication Date
EP0178998A1 true EP0178998A1 (en) 1986-04-23
EP0178998B1 EP0178998B1 (en) 1988-11-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850402007 Expired EP0178998B1 (en) 1984-10-16 1985-10-16 Jack-type lifting device for a vehicle

Country Status (4)

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EP (1) EP0178998B1 (en)
DE (1) DE3566525D1 (en)
ES (1) ES296114Y (en)
FR (1) FR2571708B1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0335775A1 (en) * 1988-03-29 1989-10-04 Elf Atochem S.A. Process for the preparation of polydichlorophosphazene compounds with a controlled cyclic oligomer content, and compounds obtained by this process
EP0771757A3 (en) * 1995-10-31 1998-08-05 Proma S.r.l. A screw and pantograph lifting jack, particularly for a motor vehicle
EP0774440A3 (en) * 1995-11-07 1999-03-31 Ventra Group Inc. One-piece load rest
WO2017127038A1 (en) * 2016-01-23 2017-07-27 Arikan Kriko Ve Makina Sanayi Ve Ticaret Anonim Sirketi Lifting heads for jackscrews
CN108640007A (en) * 2018-06-27 2018-10-12 上海宝山大陆汽车配件有限公司 Scissor-like jack
FR3112137A1 (en) 2020-07-03 2022-01-07 Renault S.A.S Lifting system of a motor vehicle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE925072C (en) * 1949-06-08 1955-03-10 Gen Motors Corp Scissor-like jack
US2920871A (en) * 1957-04-26 1960-01-12 Samuel S Kolodin Automobile jack
US3317187A (en) * 1966-02-07 1967-05-02 Ryerson & Haynes Inc Scissors jack
FR2314132A1 (en) * 1975-06-11 1977-01-07 Noury Roger Vehicle jack with curved foot and lift pad - has quadrilateral upwardly inclined linkage with unequal arms and diagonal screw
GB2050551A (en) * 1979-05-10 1981-01-07 Aguirregomezcorta Sa Vehicle Jack
FR2510090A1 (en) * 1981-07-22 1983-01-28 Florimond Chabardes Outil Astr Scissors linkage car jack - has uneven length upper arms and worked by hexagon headed trapezoidal threaded screw

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE925072C (en) * 1949-06-08 1955-03-10 Gen Motors Corp Scissor-like jack
US2920871A (en) * 1957-04-26 1960-01-12 Samuel S Kolodin Automobile jack
US3317187A (en) * 1966-02-07 1967-05-02 Ryerson & Haynes Inc Scissors jack
FR2314132A1 (en) * 1975-06-11 1977-01-07 Noury Roger Vehicle jack with curved foot and lift pad - has quadrilateral upwardly inclined linkage with unequal arms and diagonal screw
GB2050551A (en) * 1979-05-10 1981-01-07 Aguirregomezcorta Sa Vehicle Jack
FR2510090A1 (en) * 1981-07-22 1983-01-28 Florimond Chabardes Outil Astr Scissors linkage car jack - has uneven length upper arms and worked by hexagon headed trapezoidal threaded screw

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0335775A1 (en) * 1988-03-29 1989-10-04 Elf Atochem S.A. Process for the preparation of polydichlorophosphazene compounds with a controlled cyclic oligomer content, and compounds obtained by this process
EP0771757A3 (en) * 1995-10-31 1998-08-05 Proma S.r.l. A screw and pantograph lifting jack, particularly for a motor vehicle
EP0774440A3 (en) * 1995-11-07 1999-03-31 Ventra Group Inc. One-piece load rest
WO2017127038A1 (en) * 2016-01-23 2017-07-27 Arikan Kriko Ve Makina Sanayi Ve Ticaret Anonim Sirketi Lifting heads for jackscrews
CN108640007A (en) * 2018-06-27 2018-10-12 上海宝山大陆汽车配件有限公司 Scissor-like jack
FR3112137A1 (en) 2020-07-03 2022-01-07 Renault S.A.S Lifting system of a motor vehicle

Also Published As

Publication number Publication date
EP0178998B1 (en) 1988-11-30
DE3566525D1 (en) 1989-01-05
ES296114Y (en) 1989-05-01
ES296114U (en) 1987-11-01
FR2571708B1 (en) 1987-12-18
FR2571708A1 (en) 1986-04-18

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