EP0440348A1 - Cric de véhicule - Google Patents

Cric de véhicule Download PDF

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Publication number
EP0440348A1
EP0440348A1 EP91300278A EP91300278A EP0440348A1 EP 0440348 A1 EP0440348 A1 EP 0440348A1 EP 91300278 A EP91300278 A EP 91300278A EP 91300278 A EP91300278 A EP 91300278A EP 0440348 A1 EP0440348 A1 EP 0440348A1
Authority
EP
European Patent Office
Prior art keywords
track
load
arm
support element
jack
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
EP91300278A
Other languages
German (de)
English (en)
Other versions
EP0440348B1 (fr
Inventor
Keith Frederick Williams
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.)
Metallifacture Ltd
Original Assignee
Metallifacture Ltd
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
Priority claimed from GB909002250A external-priority patent/GB9002250D0/en
Application filed by Metallifacture Ltd filed Critical Metallifacture Ltd
Publication of EP0440348A1 publication Critical patent/EP0440348A1/fr
Application granted granted Critical
Publication of EP0440348B1 publication Critical patent/EP0440348B1/fr
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

Definitions

  • the present invention relates to vehicle jacks.
  • Jacks are well known of the type having first and second pivotally interconnected elongate members, with a base element at a lower end of the first member and a load-support element at an upper end of the second member, and with a rotatable adjustment screw between the members. Old examples are described in GB-A-1454847, whose load-support element is fixed to the second member, and GB-A-1011933, whose load-support element is pivoted to the second member.
  • the vehicle tilts, so that there is a tendency for the jacking point to move relative to the jack. Allowance for such movement is necessary for stability of the jack.
  • the jacking point is often a welded seam on the body.
  • the load-support element is designed to permit the seam to slide relative to the element. This has the disadvantages of frictional resistance to such movement as well as surface damage to both the seam and the load-support element, so that both may be liable to rust. In GB-A-1011933, this problem is avoided, because the load-support element can be fixed relative to a jacking point on the vehicle. As the vehicle tilts, in a jacking operation, the load-support element pivots to compensate.
  • a metal load-support element is provided.
  • a hollow, generally cylindrical element is formed having an axial mouth.
  • the mouth is bounded by opposed lips.
  • the element is received in recesses in the sides of a metal, channel-shaped arm and can swivel in the recesses.
  • Relative movement between the seam and the arm is provided partly by movement of the seam in the interior of the cylindrical element and partly by swivelling of the element in the recesses.
  • the body seats on the element so that scuffing of the body of the vehicle occurs as the seam moves relatively in the element.
  • a further disadvantage is that the seam is received within the arm, so that there is a very short radial distance between the axis of the element and the vehicle body adjacent the seam. As a consequence, as the vehicle body tilts away from the jack, the jack is drawn with it, causing instability of the jack.
  • the load-support element is a plastics moulding having trunnions pivoted in the arm, and a recess, for receiving the seam, spaced from the axis of rotation of the trunnions.
  • the vehicle body is spaced further from the axis, so that it should be possible for the tilting of the body to be partly accommodated by the recess moving with the seam relative to the arm.
  • the arrangement is such, however, that the old problem of instability of the jack would be met due to the free pivotal movement of the load-support element in the arm, and this is prevented by securing the element to the screw, as in DE-A-2430033.
  • DE-C-2936002 overcomes the inflexibility problem, so introduced, by providing a wide recess for the seam, as in DE-C-2954496. Scuffing of the body will occur, although this is mitigated by use of a plastics element. In the raised state of the jack, there is a levering action of the seam against a side of the recess, putting this side in shear. There is, therefore, risk of the element breaking with consequent collapse of the vehicle.
  • GB-A-2176458 discloses a jack in which a track element is mounted on the arm and has a convex bearing surface.
  • the load support element is formed with an arcuate rotary portion defining a concave surface which engages the convex bearing surface. This arrangement does not provide sufficiently free movement of the load support element, which tends to be frictionally held relative to the arm. For effective operation, very low frictional forces are necessary and it is not practically possible to reduce friction sufficiently by choice of materials which can be used in a jack. This arrangement is also expensive to manufacture.
  • the present invention seeks to overcome these problems and provides an improvement over GB-A-2176458, the jack of the invention being capable of cheap manufacture with the load-support element being sufficiently movable to be effective with sufficient pivotal control to avoid instability, as in DE-C-2936002, without the disadvantage of securing the element to the screw, and without the problem of scuffing of the body of the vehicle, as in DE-C-2954496.
  • the present invention provides a jack having an elongate leg with a base element at one end, an elongate arm supported by the leg and pivotally movable relative thereto under the control of adjustable means including a member pivotally connected to the arm, an arcuate track element provided on the arm at a location spaced along the arm from the pivotal connection of said member to the arm, the element defining a bearing surface, a load-support element having a rotary portion complementary to the bearing surface and angularly movable in engagement with the bearing surface, and an engagement portion having an end surface provided with a recess for receiving a seam of a vehicle, said end surface being opposite to said rotary portion, with an intervening part between the rotary portion and the engagement portion, and means to captivate the load-support element on the track element, characterised in that the bearing surface is concave, the complementary rotary portion is convex, and the recess is substantially located outside the concave surface and beyond the centre thereof, so as, in use, to locate the seam at a position
  • the jack shown comprises an elongate leg 11 secured to, or formed in one piece with a base element 12.
  • the jack shown is of the type in which the base has a setting-up surface 13 and a main support surface 14 and in which, in use, the jack rolls from a position supported by the setting-up surface to a position supported by the main support surface.
  • the leg 11 may be pivoted to a base. Both types of jack are well known.
  • An arm 16 is pivoted to the leg 11 by a pivot pin 17. Both the arm and the leg are made of channel-shaped metal pressings, with the arm received between the channel sides of the leg.
  • a screw 19 extends between the arm and the leg and is pivotally mounted on both. In the jack shown, the screw extends through a pivot device 20, pivotally mounted between the channel sides of the leg, near its end remote from the base. The screw is captivated on the pivot device with a ball-race bearing 21 provided on the screw and bearing against the device. The screw extends through and is screw-engaged with a nut 23, pivotally mounted on the arm. The positions of the pivot device 20 and the nut 23 may be reversed.
  • a handle 25 is secured to the screw.
  • a load-support element 30 is mounted on the arm at the end remote from the pivot 17, and is spaced from the pivot connection of the nut 23 to the arm.
  • the jack In operation, the jack is initially arranged, as shown in Fig.1 supported on its setting-up surface 13, with the load-support element 30 engaged with a seam of a vehicle body.
  • the handle is turned to rotate the screw, so that the leg 11 is drawn towards the arm 16 with accompanying lift of the load-support surface.
  • the jack rolls onto the main support surface 14, during such operation.
  • Jacks of this type are well known, as is shown in the documentation previously referred to, e.g. as in DE-A-2430033 and further detail of construction is, therefore, unnecessary.
  • the arm 16 is provided with part-circular rebates 31 in its channel sides, 26,27 (Fig.2).
  • a track element 32 which is a metal pressing of arcuate form, has an external convex surface complementary to the rebates and is secured (e.g. welded) therein, with the track element bridging the channel sides 26,27.
  • the track element has a concave bearing surface 33 with marginal edges 34, which overhang the channel sides 26,27.
  • the load-support element 30 is a plastics moulding, e.g. of low friction material such as a polyamide.
  • the element comprises a block having an engagement portion 35 provided with a recess, or groove 37, in an upper end surface 38, for receiving the seam of a vehicle body.
  • the groove 37 tapers slightly and is broader at the mouth than at the bottom of the groove.
  • the load-support element has a rotary portion at its lower end, opposite to the upper end surface 38, formed with a convex surface 39, complementary to and seated on the concave bearing surface 33.
  • the element overhangs the edges of the bearing surface 33 and has extensions defining inturned flanges 40.
  • the flanges have concave surfaces which engage with the convex surfaces of the marginal edges 34 of the track element 32, so as to captivate the load-support element on the track element.
  • An intermediate part 41 is provided between the groove 37 and the lower end 39, so that the groove is located outside the area bounded by the concave surface and an imaginary chord 45 (Fig.1) drawn through the ends of the concave surface, as viewed in cross-section.
  • the load-support element slides on the concave bearing surface during lift, so as to compensate for tilt of the vehicle and rotation of the lift arm 16 relative to the vehicle.
  • the sliding arrangement provides control of the angular movement so that stability of the jack is maintained and the location of the groove 37, spaced substantially from the concave bearing surface, assists in maintaining such stability.
  • the arm 16 is again formed with rebates 31 in its channel sides 26,27 and a track element 132 is secured in the rebates, so as to bridge the channel sides.
  • the track element has a concave bearing surface 133 and overhangs the channel sides.
  • the opposite edges of the track element are formed with side walls and inturned flanges 140, which overlie the marginal edges of the concave bearing surface.
  • the load-support element 130 is again a moulded plastics block with an engagement portion 135 having an upper surface 138 and a groove 137.
  • An intermediate portion 141 and a convex lower end surface 139, which engages the concave bearing surface are also provided.
  • the lower end of the element is formed with arcuate marginal edge formations 150 which engage beneath the flanges 140 of the track element, so that the load-support element is captivated on the track element.
  • the intermediate portion 141 is reduced in width to define the marginal edge formations 150.
  • the track element will also have formations (not shown) to prevent the load-support element from being detached from the track element.
  • FIG. 6 an embodiment is shown in which the track element 32 or 132 is replaced by a pair of elements 33a,33b integrally formed, as arcuate flanges, with the channel sides 26,27 of the arm 16.
  • the flanges project inwardly of the sides 26,27 and adjoin respective rebates 31. This arrangement is particularly easy to manufacture and strong, in use.
  • the load support element 230 is a moulded plastics block, similar to that of Fig.3 with an engagement portion 235 having an upper surface 238, a groove 237, an intermediate portion 241 and a convex lower end portion 239, which engages the concave bearing flanges 33a,33b.
  • the block has an inverted-T section portion 250 having a portion 253 between the flanges and a cross-piece 254 defining grooves 251,252 with the end portion 239.
  • the grooves receive the flanges 33a,33b, whereby the support element 230 is captivated on the flanges by the cross-portion 251.
  • the flanges 33a,33b may be outwardly turned to engage a load support element 30, as shown in Fig.3.
  • FIG. 8 a modification of the embodiment of Figs. 4 and 5 is shown.
  • the load support element 30 is the same as that in Figs. 4 and 5.
  • the track element 132 is, however, replaced by a pair of elements 133 a ,133 b , each integral with a respective channel side 26,27 of the arm 16.
  • Each track element is channel-shaped with the mouths of the elements facing each other.
  • Each track element is arcuate and adjoins a corresponding rebate 31.
  • the concave track surface in any of the embodiments may be part-spherical so as to permit limited movement laterally of the arm 16.

Landscapes

  • 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)
  • Body Structure For Vehicles (AREA)
EP19910300278 1990-02-01 1991-01-15 Cric de véhicule Expired EP0440348B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB909002250A GB9002250D0 (en) 1990-02-01 1990-02-01 Vehicle jack
GB9002250 1990-02-01
GB909008009A GB9008009D0 (en) 1990-02-01 1990-04-09 Vehicle jack
GB9008009 1990-04-09

Publications (2)

Publication Number Publication Date
EP0440348A1 true EP0440348A1 (fr) 1991-08-07
EP0440348B1 EP0440348B1 (fr) 1992-11-11

Family

ID=26296587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910300278 Expired EP0440348B1 (fr) 1990-02-01 1991-01-15 Cric de véhicule

Country Status (5)

Country Link
EP (1) EP0440348B1 (fr)
DE (2) DE69100009T2 (fr)
ES (1) ES2035757T3 (fr)
GB (1) GB2240536B (fr)
TR (1) TR25617A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0565801A1 (fr) * 1992-04-14 1993-10-20 E.P.I., EUROPEENNE DE PARTICIPATIONS INDUSTRIELLE, Société Anonyme Cric pour véhicules
EP0749936A2 (fr) * 1995-06-20 1996-12-27 August Bilstein GmbH Cric de véhicule
ES2129311A1 (es) * 1996-01-22 1999-06-01 Batz S Coop Ltada Gato para vehiculos.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR760546A (fr) * 1933-07-29 1934-02-24 Dispositif de guidage pour mise en place facile et précise des crics de soulèvement, s'appliquant notamment aux véhicules automobiles
US2618464A (en) * 1945-11-05 1952-11-18 Sintz Claude Jack
US4146208A (en) * 1977-04-14 1979-03-27 Union Corporation Movable base jack
DE3033956A1 (de) * 1978-01-16 1982-06-24 August Bilstein GmbH & Co KG, 5828 Ennepetal Wagenheber
GB2176458A (en) * 1985-05-10 1986-12-31 Metallifacture Ltd Vehicle jacks
DE2954496C2 (fr) * 1979-09-06 1987-10-22 E.A. Storz Gmbh & Co Kg, 7200 Tuttlingen, De
EP0327484A1 (fr) * 1988-01-18 1989-08-09 Batz, S. Coop. Ltda. Cric de véhicule
DE9002560U1 (de) * 1990-03-06 1990-05-10 Lahnwerk GmbH & Co KG Verformungstechnik Friedensdorf, 3563 Dautphetal Wagenheber

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2936002A1 (de) * 1979-09-06 1981-03-26 E.A. Storz Gmbh & Co Kg, 78532 Tuttlingen Wagenheber

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR760546A (fr) * 1933-07-29 1934-02-24 Dispositif de guidage pour mise en place facile et précise des crics de soulèvement, s'appliquant notamment aux véhicules automobiles
US2618464A (en) * 1945-11-05 1952-11-18 Sintz Claude Jack
US4146208A (en) * 1977-04-14 1979-03-27 Union Corporation Movable base jack
DE3033956A1 (de) * 1978-01-16 1982-06-24 August Bilstein GmbH & Co KG, 5828 Ennepetal Wagenheber
DE2954496C2 (fr) * 1979-09-06 1987-10-22 E.A. Storz Gmbh & Co Kg, 7200 Tuttlingen, De
GB2176458A (en) * 1985-05-10 1986-12-31 Metallifacture Ltd Vehicle jacks
EP0327484A1 (fr) * 1988-01-18 1989-08-09 Batz, S. Coop. Ltda. Cric de véhicule
DE9002560U1 (de) * 1990-03-06 1990-05-10 Lahnwerk GmbH & Co KG Verformungstechnik Friedensdorf, 3563 Dautphetal Wagenheber

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0565801A1 (fr) * 1992-04-14 1993-10-20 E.P.I., EUROPEENNE DE PARTICIPATIONS INDUSTRIELLE, Société Anonyme Cric pour véhicules
EP0749936A2 (fr) * 1995-06-20 1996-12-27 August Bilstein GmbH Cric de véhicule
EP0749936A3 (fr) * 1995-06-20 1999-04-07 Krupp Bilstein GmbH Cric de véhicule
ES2129311A1 (es) * 1996-01-22 1999-06-01 Batz S Coop Ltada Gato para vehiculos.

Also Published As

Publication number Publication date
TR25617A (tr) 1993-07-01
GB2240536A (en) 1991-08-07
DE440348T1 (de) 1992-04-30
ES2035757T3 (es) 1993-04-16
GB2240536B (en) 1994-01-19
EP0440348B1 (fr) 1992-11-11
GB9100824D0 (en) 1991-02-27
DE69100009T2 (de) 1993-04-08
DE69100009D1 (de) 1992-12-17

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