EP0178998B1 - Jack-type lifting device for a vehicle - Google Patents

Jack-type lifting device for a vehicle Download PDF

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Publication number
EP0178998B1
EP0178998B1 EP19850402007 EP85402007A EP0178998B1 EP 0178998 B1 EP0178998 B1 EP 0178998B1 EP 19850402007 EP19850402007 EP 19850402007 EP 85402007 A EP85402007 A EP 85402007A EP 0178998 B1 EP0178998 B1 EP 0178998B1
Authority
EP
European Patent Office
Prior art keywords
lifting
jack
base
respect
parallelogram
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
Application number
EP19850402007
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German (de)
French (fr)
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EP0178998A1 (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.)
Regie Nationale des Usines Renault
Original Assignee
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.)
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Publication date
Application filed by Regie Nationale des Usines Renault filed Critical Regie Nationale des Usines Renault
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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    • 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

Definitions

  • 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.
  • 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.
  • this tilting moment causes additional forces in the jack, especially on the toothed parallelogram drive segments.
  • 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.
  • the jack-type lifting device (1) intended in particular for lifting a motor vehicle, comprising a parallelogram assembly consisting essentially of a lifting head secured to two upper arms (2,3) and two lower arms (4,5) resting on a base (24) and controlled by an operating device inclined with respect to a base (25) of the base, said lower arms being articulated respectively around lower axes (12 , 13) mounted in the base, the distance of one of the lower axes (12) from the base being less than that of the other axis (13) so that the axis B of the parallelogram is inclined with respect to the vertical on the side of the lower axis located closest to the sole.
  • the lifting head (19) at its bearing face (20) which is offset by a value (A) relative to the axis (B) of the parallelogram on the side opposite to that having the lower axis located the most near the sole, in order to avoid a moment of tilting of the jack when said jack (1) is in the useful lifting position.
  • 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.
  • 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.
  • 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.
  • the upper arms 2 and 3 are connected respectively 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 lower arm 5 by means of the pin 18.
  • the two upper arms 2 and 3 are respectively provided with toothed segments 6 and 7 which mesh with each other.
  • the two lower arms 4 and 5 are respectively provided with toothed segments 8 and 9 which mesh with each other.
  • 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.
  • the holes 12a are located, relative to the sole 25, at a distance which is less than that of the holes 13a.
  • This difference in position between the holes 12a and 13a is determined so as to obtain the desired inclination for the operating device.
  • the lifting head 19 is in one piece and consists of a bearing face 20 which connects two vertical parallel sides 21 and 22.
  • each of these sides 21 and 22 are arranged a hole 10a and a hole 11a.
  • the holes 10a must be located relative to the bearing 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.
  • 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.
  • the lifting head 19 has an engagement end 23 which is linked to the bearing face 20.
  • 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.
  • 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.

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 comme cela est décrit dans le brevet américain US-A-2920871 (KOLODIN).
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 as described in American patent US-A-2920871 (KOLODIN).

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 (1) destiné notamment à soulever un véhicule automobile, comportant un ensemble à parallélogramme constitué essentiellement par une tête de levage solidaire de deux bras supérieurs (2,3) et de deux bras inférieurs (4,5) reposant sur un socle (24) et commandé par un dispositif de manoeuvre incliné par rapport à une semelle (25) du socle, lesdits bras inférieurs s'articulant respectivement autour d'axes inférieurs (12, 13) montés dans le socle, la distance de l'un des axes inférieurs (12) par rapport à la semelle étant plus faible que celle de l'autre axe (13) de telle sorte que l'axe B du parallélogramme soit incliné par rapport à la verticale du côté de l'axe inférieur situé le plus près de la semelle. La tête de levage (19) à sa face d'appui (20) qui est décalée d'une valeur (A) par rapport à l'axe (B) du parallélogramme du côté opposé à celui comportant l'axe inférieur situé le plus près de la semelle, afin d'éviter un moment de basculement du cric lorsque ledit cric (1) est en position utile de levée.According to one embodiment of the invention, the jack-type lifting device (1) intended in particular for lifting a motor vehicle, comprising a parallelogram assembly consisting essentially of a lifting head secured to two upper arms (2,3) and two lower arms (4,5) resting on a base (24) and controlled by an operating device inclined with respect to a base (25) of the base, said lower arms being articulated respectively around lower axes (12 , 13) mounted in the base, the distance of one of the lower axes (12) from the base being less than that of the other axis (13) so that the axis B of the parallelogram is inclined with respect to the vertical on the side of the lower axis located closest to the sole. The lifting head (19) at its bearing face (20) which is offset by a value (A) relative to the axis (B) of the parallelogram on the side opposite to that having the lower axis located the most near the sole, in order to avoid a moment of tilting of the jack when said jack (1) is in the useful lifting position.

Les différents modes de réalisation de l'invention sont définis dans les revendications 2 à 4.The different embodiments of the invention are defined in claims 2 to 4.

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 et illustré par les dessins annexéx, 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 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 paralélogramme 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 11a. 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.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.

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 connected respectively 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 lower arm 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 11a. 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 11a. Cette différence de position est déterminée de façon à obtenir l'inclinaison voulue pour le dispositif de manoœuvre.On each of these sides 21 and 22 are arranged a hole 10a and a hole 11a. The holes 10a must be located relative to the bearing 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 (4)

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.
2. A lifting device according to claim 1 characterised in that the support face (20) is provided with an engagement end (23).
3. A lifting device according to either one of the preceding claims characterised in that the lifting head (19) is formed by two parallel side portions (21 and 22) which are connected by the support face (20), the side portions (21 and 22) comprising holes (10a) which are disposed relative to the support face (20) at a distance which is greater than the holes (11a) so as to produce the desired inclination for the actuating device.
4. A lifting device according to any one of the preceding claims characterised in that the actuating device is formed by an actuating screw (14) co-operating with the trunnion members (17 and 18), the actuating 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 EP0178998A1 (en) 1986-04-23
EP0178998B1 true EP0178998B1 (en) 1988-11-30

Family

ID=9308682

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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108495806A (en) * 2016-01-23 2018-09-04 阿里坎千斤顶机器工业和贸易股份公司 The lift head of screw jack

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2629442B1 (en) * 1988-03-29 1990-11-23 Atochem PROCESS FOR THE PREPARATION OF POLYDICHLOROPHOSPHAZENES COMPOSITIONS WITH A CONTROLLED RATE OF CYCLIC OLIGOMERS AND THE COMPOSITIONS RESULTING FROM THE IMPLEMENTATION OF THIS PROCESS
EP0771757B1 (en) * 1995-10-31 2001-11-21 Proma S.r.l. A screw and pantograph lifting jack, particularly for a motor vehicle
US5697598A (en) * 1995-11-07 1997-12-16 Ventra Group Inc. One piece load rest
CN108640007B (en) * 2018-06-27 2020-08-28 上海宝山大陆汽车配件股份有限公司 Scissor jack
FR3112137B1 (en) 2020-07-03 2022-08-19 Renault Sas Motor vehicle lifting system

Family Cites Families (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
ES243211Y (en) * 1979-05-10 1980-02-16 PERFECTED JACK FOR VEHICLES.
FR2510090B1 (en) * 1981-07-22 1985-10-25 Florimond Chabardes Outil Astr IMPROVEMENTS ON "LOSANGE" JACKS INTENDED FOR LIFTING PARTICULARLY MOTOR VEHICLES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108495806A (en) * 2016-01-23 2018-09-04 阿里坎千斤顶机器工业和贸易股份公司 The lift head of screw jack

Also Published As

Publication number Publication date
DE3566525D1 (en) 1989-01-05
ES296114Y (en) 1989-05-01
ES296114U (en) 1987-11-01
EP0178998A1 (en) 1986-04-23
FR2571708B1 (en) 1987-12-18
FR2571708A1 (en) 1986-04-18

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