EP0344892A1 - Wagenheber - Google Patents

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Publication number
EP0344892A1
EP0344892A1 EP89303366A EP89303366A EP0344892A1 EP 0344892 A1 EP0344892 A1 EP 0344892A1 EP 89303366 A EP89303366 A EP 89303366A EP 89303366 A EP89303366 A EP 89303366A EP 0344892 A1 EP0344892 A1 EP 0344892A1
Authority
EP
European Patent Office
Prior art keywords
arm
support
leg
teeth
vehicle
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.)
Withdrawn
Application number
EP89303366A
Other languages
English (en)
French (fr)
Inventor
Howard C. Marshall
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
Application filed by Metallifacture Ltd filed Critical Metallifacture Ltd
Publication of EP0344892A1 publication Critical patent/EP0344892A1/de
Withdrawn legal-status Critical Current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

  • This invention relates to a vehicle jack.
  • the invention is concerned with the type of jack which has a support provided with an arm angularly movable relative to the support by operating means.
  • the arm is provided with a formation for engaging with a part of a vehicle, whereby the vehicle may be lifted as the operating means is actuated.
  • a jack of this type is disclosed in GB-A-2053846.
  • the support comprises an elongate leg and the arm is pivoted to the leg at a fixed point between its ends.
  • the leg is mounted at its lower end on a foot and the foot is capable of rolling from a start position to an operative position.
  • the operating means comprises a screw extending between the upper end of the leg and the arm. Jacks of this general type are currently the most commonly used for motor cars.
  • GB-A-­2053846 One disadvantage of the jack disclosed in GB-A-­2053846 is that the potential load on the screw is very high as the arm first takes a load and this load reduces as the lift increases. This characteristic, makes it difficult to operate the jack at the start of lift if under load. Conversely, the degree of lift for each turn of the screw reduces as the lift increases, so that substantial rotation of the screw is required for little gain in lift as the jack approaches maximum height.
  • the present invention provides a jack which can overcome these problems and enables the jack to be smaller and lighter than has formerly been possible for the same lift.
  • GB-A-1091036 discloses a vehicle jack in which a hydraulic cylinder is actuable to move an arm along an upwardly extending support. The arm is pivotally moved by actuation of a separate hydraulic cylinder. This is a complex and expensive arrangement.
  • GB-A-265575 discloses a rail lifting device which utilises a ratchet lever for moving a pinion along a toothed sector so as to lift an arm pivotted to the member provided with the toothed sector.
  • GB-A-1199020 discloses a vehicle jack in which the arm of a side-lift type jack is pivotted to a nut which rides along a mains upright support of the jack.
  • the present invention provides a vehicle jack of the type known from GB-A-2053846 comprising a base, a support extending upwardly from the base, an arm mounted on the support for angular movement relative thereto, means mounted on the arm including a formation for engagement with a part of a vehicle, and elongate operating means pivotally connected between the support and the arm and actuable to draw the arm angularly towards the support to raise the arm and effect lift.
  • the invention is characterised in that the arm is movably mounted on the support so as to be moved under the influence of the operating means along the support relative to the base as the arm is moved angularly by the operating means.
  • the operating means is conveniently a screw as is usual in current jacks, one of the pivotal connections including a nut engaged with the screw.
  • the arm is provided with an arcuate row of teeth meshed with a row of teeth on the support, whereby the arm rolls along the support as the operating means is actuated.
  • the row of teeth on the support may be substantially linear or may be arcuate along a convex surface.
  • the support may comprise an elongate leg having the pivotal connection with the screw located adjacent an upper end and having a foot secured to the lower end.
  • the foot has adjacent relatively angled surfaces, one surface defining a setting up surface for the start of a jacking operation, the jack rolling onto the other surface during lift.
  • the leg is pivotally mounted on the foot. Arrangements of both types are known per se .
  • the formation, for engaging with a part of the vehicle is located substantially directly above the foot and said relative movement of the arm and the support maintains this location in all operative positions.
  • the jack of the present invention is constructed so that the fulcrum positions of the constituent members vary during operation. It is possible to formulate the rolling surfaces between the arm and the support and the pivotal positions for the screw to provide desired patterns of rate of lift and desired patterns of screw load.
  • the construction according to the invention permits the load, if desired, on the screw to be generally constant during lift and for the rate of lift also to be generally constant.
  • the jack shown comprises an elongate support, or leg 11 of channel form having a base 12 and opposite sides 13, 14.
  • the base is shaped at a lower end of the jack to define a foot 15 having a setting up surface 16 and a main support surface 17 angled to the setting up surface.
  • a substantial part of the base is provided internally of the channel with a substantially linear row of teeth 18 spaced longitudinally of the leg.
  • An arm 20 is mounted on the leg within the channel for angular movement relative to the leg.
  • the arm is also of channel shape, having a pair of spaced, parallel plates 21, 22.
  • the arm is provided, at the end remote from the leg, with a formation 23 for engaging with a part of a vehicle.
  • the formation bridges the plates and strengthens the construction.
  • the arm is provided on convex surfaces of the two plates with arcuate rows of teeth 22.
  • the arcuate teeth 22 and the linear teeth 18 are designed so that the arm 20 cam roll along the base 23 with the teeth in mesh.
  • a pivot pin 25 is mounted between the plates 21, 22 and radially receives a head 26 of a screw 27.
  • a bearing yoke 28 is located on the screw between the head and the pivot pin in conventional manner.
  • a nut 30 is pivotally mounted between the sides 13, 14 of the leg at the end remote from the foot 15.
  • the screw 27 is engaged with the nut and the end part of the screw, remote from the head 26 carries a mounting member 31 for a crank handle 32.
  • the sides 13, 14 of the leg are provided with elongate slots 35, 36, parallel to the base 12 and the linear row of teeth 18.
  • a headed pin or roller 37 projects from each plate 21 and 22 and engages in a corresponding one of the slots 35, 36.
  • the jack In use, the jack is arranged supported on the setting up surface 16 whilst the arm 20 is raised until the formation 23 engages with a vehicle.
  • the handle 32 In order to raise the arm, the handle 32 is rotated to turn the screw 27, so that the pivot pin 25 is drawn towards the nut 30.
  • This operation causes the convex teeth 22 to roll along the linear teeth 18 up the leg 11 of the jack.
  • This movement causes lifting of the formation 23, both by the angular motion of the arm and the linear component of the rolling motion.
  • the pins or rollers 37 guide the arm and, by their engagement in the slots 35, 36, retain the integrity of the jack.
  • the leg As the jack begins to lift, the leg tilts onto the main support surface 17 in known manner.
  • the potential load on the screw remains substantially constant during lift and the rate of lift is substantially constant.
  • the arm In the fully raised position, the arm is located near to the upper end of the leg and this allows the jack to be shorter than is possible for an equivalent jack of the type shown in GB-A-2053846.
  • the jack of the invention can, therefore, be smaller, lighter and easier to operate than existing jacks.
  • the leg 11 may be provided with a convex, arcuately arranged row of teeth instead of the linearly arranged teeth 18.
  • Suitable geometry can be achieved for a wide range of curved surfaces such that the desired proportion of lift and screw load can be achieved.
  • the teeth on leg 11 may lie on an arc whose curvature varies from an infinite radius to a small radius whilst the teeth on the arm 22 may lie on the arc which varies from small radius to infinite radius.
  • Matching the two radii with suitable positions of the screw bearing points provides the desired characteristics. A particularly elegant solution exists when the two surfaces are circular and the radii are equal.

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)
EP89303366A 1988-04-12 1989-04-05 Wagenheber Withdrawn EP0344892A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888808521A GB8808521D0 (en) 1988-04-12 1988-04-12 Vehicle jack
GB8808521 1988-04-12

Publications (1)

Publication Number Publication Date
EP0344892A1 true EP0344892A1 (de) 1989-12-06

Family

ID=10634986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89303366A Withdrawn EP0344892A1 (de) 1988-04-12 1989-04-05 Wagenheber

Country Status (2)

Country Link
EP (1) EP0344892A1 (de)
GB (1) GB8808521D0 (de)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE70706C (de) * G. H. BRYANT und V. BEAURE-GARD in Newton bezw. Boston, Massach., V. St. A Zahnstangenwinde mit Schlitten zum Heben und Ausrichten von Eisenbahngeleisen und dergl
US2121861A (en) * 1936-05-19 1938-06-28 Dickerson Arthur Jack
DE1073710B (de) * 1958-07-18 1960-01-21 Norddeutsche Schrauben und Mutternwerke A G Peine Wagenheber mit Schraubenspindel
US2973939A (en) * 1956-09-07 1961-03-07 Creighton W Ryerson Jack
DE1175406B (de) * 1962-05-05 1964-08-06 E A Storz O H G Wagenheber fuer Kraftfahrzeuge
GB1091036A (en) * 1965-05-17 1967-11-15 Albert Larsson An apparatus for lifting motor vehicles
DE1273160B (de) * 1966-06-10 1968-07-18 E A Storz O H G Wagenheber
DE2453260A1 (de) * 1974-11-09 1976-05-13 Teves Gmbh Alfred Nach dem kniehebelprinzip arbeitender wagenheber
EP0226695A1 (de) * 1985-12-18 1987-07-01 Ford-Werke Aktiengesellschaft Wagenheber für Kraftfahrzeuge

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE70706C (de) * G. H. BRYANT und V. BEAURE-GARD in Newton bezw. Boston, Massach., V. St. A Zahnstangenwinde mit Schlitten zum Heben und Ausrichten von Eisenbahngeleisen und dergl
US2121861A (en) * 1936-05-19 1938-06-28 Dickerson Arthur Jack
US2973939A (en) * 1956-09-07 1961-03-07 Creighton W Ryerson Jack
DE1073710B (de) * 1958-07-18 1960-01-21 Norddeutsche Schrauben und Mutternwerke A G Peine Wagenheber mit Schraubenspindel
DE1175406B (de) * 1962-05-05 1964-08-06 E A Storz O H G Wagenheber fuer Kraftfahrzeuge
GB1091036A (en) * 1965-05-17 1967-11-15 Albert Larsson An apparatus for lifting motor vehicles
DE1273160B (de) * 1966-06-10 1968-07-18 E A Storz O H G Wagenheber
DE2453260A1 (de) * 1974-11-09 1976-05-13 Teves Gmbh Alfred Nach dem kniehebelprinzip arbeitender wagenheber
EP0226695A1 (de) * 1985-12-18 1987-07-01 Ford-Werke Aktiengesellschaft Wagenheber für Kraftfahrzeuge

Also Published As

Publication number Publication date
GB8808521D0 (en) 1988-05-11

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