EP0295128A1 - Crics - Google Patents

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Publication number
EP0295128A1
EP0295128A1 EP88305328A EP88305328A EP0295128A1 EP 0295128 A1 EP0295128 A1 EP 0295128A1 EP 88305328 A EP88305328 A EP 88305328A EP 88305328 A EP88305328 A EP 88305328A EP 0295128 A1 EP0295128 A1 EP 0295128A1
Authority
EP
European Patent Office
Prior art keywords
gear
lead screw
jack
rotation
load
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Withdrawn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
EP88305328A
Other languages
German (de)
English (en)
Inventor
Graham Henry Colton
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 EP0295128A1 publication Critical patent/EP0295128A1/fr
Withdrawn legal-status Critical Current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 is concerned with load-lifting jacks having a pair of upper arms supporting a load-engaging head and a pair of lower arms supported on a base member, the upper and lower arms being pivotally interconnected to form the sides of a parallelogram, and a lead screw extending between the pivot points of the opposite pairs of the upper and lower arms so that rotation of the lead screw raises or lowers the load-engaging head relative to the base.
  • a jack of the type defined Such a jack of the type defined.
  • Jacks of the type defined are known, see for example Patent Specification No. 1369186.
  • the jack is shown in Figure 1 in a partly extended condition.
  • both the load-engaging head and the base member are closely adjacent the lead screw and close to one another.
  • the applicants have found that such jacks can be difficult for a relatively weak person to operate from a fully closed position (with the load-engaging head and base in close proximity) especially when jacking a heavy vehicle.
  • One of the various objects of the present invention is to provide an improved jack of the type defined.
  • the invention provides a load-lifting jack having a pair of upper arms supporting a load-­engaging head and a pair of lower arms supported on a base member, the upper and lower arms being pivotally interconnected to form the sides of a parallelogram, a lead screw extending between the pivot points of the opposite pairs of the upper and lower arms so that rotation of the lead screw raises or lowers the load-­engaging head relative to the base, and means for rotating the lead screw characterised in that the jack comprises a first gear secured to the lead screw in axial alignment therewith and a second gear mounted in mesh with the first gear and adapted for connection to a handle so that rotation of the second gear by a handle turns the lead screw by means of the first gear, the gear ratio providing a mechanical advantage for rotating the first gear.
  • the axis of the second gear is angled relative to the axis of the lead screw in an upward direction away from the jack, in the operative position of the jack.
  • a handle which may be connected to the drive means to rotate the second gear is inclined upwardly at a convenient angle for operation by a motorist without stooping unduly.
  • a jack in accordance with the invention comprises a housing through which the lead screw passes having bearing means which support the lead screw, and the second gear is mounted for rotation on the housing.
  • the first gear is a crown gear, suitably pressed from metal sheet and secured to a suitably shaped end portion of the lead screw keying in a correspondingly shaped hole in the gear.
  • the gear is retained on the lead screw by heading an end portion of the lead screw.
  • the gear ratio between the first and second gears is such that the second gear is rotated by the drive means through between 1.5 and 2.0 revolutions, preferably about 1.75 revolutions, for each revolution of the crown wheel (and thus the lead screw).
  • the second gear is suitably a pinion gear made by any convenient means, for example sintering metal, cutting the gear from a suitable single piece of metal and any of the other known gear forming techniques.
  • the accompanying drawing is a side view of a jack embodying the invention in a partially opened condition.
  • the jack shown in the drawing comprises a base member 2 on which are pivotted by pins 4 two lower arms 6.
  • the lower arms 6 are pivotally connected by pivots 8, 9 to upper arms 10, which are themselves connected by pivots 12 to a load-engaging member 14.
  • the upper and lower arms 6, 10, thus form a parallelogram and provide a type of parallel linkage.
  • a lead screw 16 extends between the two pivots 8, 9.
  • the lead screw 16 is mounted for rotation by bearing means. 20 and is threaded into a screw threaded bore in the pivot 9 in a manner similar to that known in jacks of the type defined, for example as described in Patent Specification No. 1369186.
  • the base member 2, arms 6, 10 and load-engaging member 14 are conveniently pressed from metal sheets in known manner.
  • the housing 18 is, in plan, generally of U-shaped configuration and comprises an upwardly projecting bracket 26.
  • An axle on which a second gear, namely a pinion 28, is mounted for rotation is secured to the bracket 26.
  • Drive means comprising a U-shaped bracket 30 is secured to the pinion 28 by any suitable means for example welding.
  • the U-shaped bracket 30 comprises two arms projecting outwardly from the pinion having aligned holes 32 in which a driving member or handle 34 may be engaged.
  • a suitable handle 34 is shown in dash line in the drawing and comprises a hooked end portion 36 adapted to be engaged in the aligned holes 32 and a shaft portion 38 extending upwardly at an angle.
  • the U-shaped bracket 30 may be rotated thereby rotating the pinion 28 and the crown gear 22 with which the pinion 28 is in meshing engagement.
  • Rotation of the crown gear 22 is effective to rotate the lead screw 16 and thus to raise or lower the load-engaging member 14.
  • the base member 2 is placed on a suitable surface for example a surface of the road 40 and the lead screw 16 is disposed generally parallel with the surface of the road 40. Because the axis of the pinion 28 is inclined at an angle relative to the axis of rotation of the lead screw 16, the drive shaft 38 is inclined upwardly thus providing a convenient means for the motorist to operate the jack without stooping.
  • the gear ratio between the second gear i.e. pinion 28, and the first, crown gear 22 is chosen to give a suitable mechanical advantage so that the initial opening movement of the jack from its fully closed position when the load-engaging member 14 and the base member 2 are both in close proximity to one another and to the lead screw does not require undue effort from the motorist. Once the jack has been opened to a reasonable extent, the necessary operating force is in any event, reduced because of the operating characteristics of this type of parallel linkage.
  • the gear ratio between the pinion 28 and the crown gear 22 is chosen to be such that for each complete revolution of the crown gear 22, the pinion rotates between 1.5 and 2 times, suitably 1.75 times.
  • connection means may be provided to enable the motorist to make a suitable connection to rotate the pinion 28.
  • the first gear is a crown gear 22 and the second gear is a pinion mounted for rotation about an axis inclined relative to the axis of the lead screw
  • a mechanical advantage may be provided by two meshing gears rotating about parallel axes; however, this latter arrangement is not preferred because in that event, the operator of the jack would have to stoop whilst operating the jack.

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)
EP88305328A 1987-06-12 1988-06-10 Crics Withdrawn EP0295128A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878713735A GB8713735D0 (en) 1987-06-12 1987-06-12 Jacks
GB8713735 1987-06-12

Publications (1)

Publication Number Publication Date
EP0295128A1 true EP0295128A1 (fr) 1988-12-14

Family

ID=10618789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88305328A Withdrawn EP0295128A1 (fr) 1987-06-12 1988-06-10 Crics

Country Status (2)

Country Link
EP (1) EP0295128A1 (fr)
GB (1) GB8713735D0 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237779A (en) * 1989-11-04 1991-05-15 John Beaumont Pontin A bi-pedal commercial wheel-brace stand
EP0620181A1 (fr) * 1993-04-14 1994-10-19 Clemente Pavanello Cric compact
EP0771757A3 (fr) * 1995-10-31 1998-08-05 Proma S.r.l. Un cric à vis et à parallélogramme, en particulier pour un véhicule à moteur
CN102672668A (zh) * 2012-05-07 2012-09-19 浚丰太阳能(江苏)有限公司 一种旋杆式边框顶开装置
CN104045020A (zh) * 2014-06-20 2014-09-17 杨振波 一种可手动调节的升降平台

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1609333A (en) * 1925-04-27 1926-12-07 Stanley J Vesely Garage jack
US1664579A (en) * 1925-06-08 1928-04-03 Twyman B Wickliffe Lifting jack
US2071470A (en) * 1933-04-18 1937-02-23 Jackomatic Corp Automobile jack
FR997547A (fr) * 1949-09-21 1952-01-07 Consortium D Inv S Nouvelles R Perfectionnement aux crics
GB2117348A (en) * 1982-03-31 1983-10-12 Chuan Wu An Screw-driven jack

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1609333A (en) * 1925-04-27 1926-12-07 Stanley J Vesely Garage jack
US1664579A (en) * 1925-06-08 1928-04-03 Twyman B Wickliffe Lifting jack
US2071470A (en) * 1933-04-18 1937-02-23 Jackomatic Corp Automobile jack
FR997547A (fr) * 1949-09-21 1952-01-07 Consortium D Inv S Nouvelles R Perfectionnement aux crics
GB2117348A (en) * 1982-03-31 1983-10-12 Chuan Wu An Screw-driven jack

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237779A (en) * 1989-11-04 1991-05-15 John Beaumont Pontin A bi-pedal commercial wheel-brace stand
GB2237779B (en) * 1989-11-04 1992-11-25 John Beaumont Pontin A wheel brace stand.
EP0620181A1 (fr) * 1993-04-14 1994-10-19 Clemente Pavanello Cric compact
EP0771757A3 (fr) * 1995-10-31 1998-08-05 Proma S.r.l. Un cric à vis et à parallélogramme, en particulier pour un véhicule à moteur
CN102672668A (zh) * 2012-05-07 2012-09-19 浚丰太阳能(江苏)有限公司 一种旋杆式边框顶开装置
CN104045020A (zh) * 2014-06-20 2014-09-17 杨振波 一种可手动调节的升降平台
CN104045020B (zh) * 2014-06-20 2016-09-07 盐城市锐金磨料磨具厂 一种可手动调节的升降平台

Also Published As

Publication number Publication date
GB8713735D0 (en) 1987-07-15

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): DE ES FR GB

17P Request for examination filed

Effective date: 19890609

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17Q First examination report despatched

Effective date: 19910311

18W Application withdrawn

Withdrawal date: 19910320

R18W Application withdrawn (corrected)

Effective date: 19910320