EP0937677A2 - Scherenhebevorrichtungen - Google Patents

Scherenhebevorrichtungen Download PDF

Info

Publication number
EP0937677A2
EP0937677A2 EP99301122A EP99301122A EP0937677A2 EP 0937677 A2 EP0937677 A2 EP 0937677A2 EP 99301122 A EP99301122 A EP 99301122A EP 99301122 A EP99301122 A EP 99301122A EP 0937677 A2 EP0937677 A2 EP 0937677A2
Authority
EP
European Patent Office
Prior art keywords
leg
pivot
ram
link
base frame
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Withdrawn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
EP99301122A
Other languages
English (en)
French (fr)
Other versions
EP0937677A3 (de
Inventor
Trevor Piggott
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.)
UK Lift Co Ltd
Original Assignee
UK Lift Co 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 UK Lift Co Ltd filed Critical UK Lift Co Ltd
Publication of EP0937677A2 publication Critical patent/EP0937677A2/de
Publication of EP0937677A3 publication Critical patent/EP0937677A3/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Withdrawn legal-status Critical Current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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/065—Scissor linkages, i.e. X-configuration
    • 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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated

Definitions

  • This invention relates to scissor lifts.
  • a currently available scissor lift is shown in Figure 1 and comprises a load carrying platform 1 with bracing members and a base frame 2. Between the platform 1 and the base frame 2 is arranged a first leg unit 3 comprising two parallel spaced apart outer leg members each connected at one end to the load carrying platform 1 by means of a fixed pivot 5 and provided at the other end with a freely rotatable roller 6, and a second leg unit 4 comprising two parallel spaced apart inner leg members each connected at one end to the base frame 2 by a fixed pivot 7 and provided at the other end with a freely rotatable roller 8.
  • the two legs 3 and 4 are interconnected by a common central pivot 9 and by at least one ram pivotally connected at one end to the first leg 3 and at the other end to the second leg 4 such that when the ram 10 is actuated the legs 3 and 4 rotate in the opposite directions about the central pivot 9 whereby the platform is raised and lowered.
  • W is the total load to be lifted, including the weight of the load carrying platform 1 and the legs 3 and 4.
  • L is the horizontal distance between the centre of the roller 6 and the central pivot 9 and a is the lever arm, i.e. the perpendicular distance between the axis of the ram 10 and a line which is parallel to the axis ofthe ram and intersects the axis of the central pivot 9 (i.e. the axis of rotation of the legs 3 and 4).
  • the present invention arose in an attempt to provide an improved scissor lift in which the force F is reduced.
  • a scissor lift comprising a load carrying platform, a base frame, a first and second leg unit situated between the platform and the base frame, the leg units crossing each other at an axis and being pivotally interconnected at said axis, the first leg being connected at one end to the load carrying platform by first fixed pivot means and provided at the other end with first freely rotatable roller means; the second leg unit being connected at one end to the base frame by second fixed pivot means and provided at the other end with second freely rotatable roller means, a link means pivotally mounted to one of the leg units, and contacting either the other leg unit or the load carrying platform, by means of freely rotatable roller means, and ram means provided with first pivot means to act directly on said other leg unit, and second pivot means at said link means.
  • Figure 2 shows a scissor lift comprising a load carrying platform 1 with bracing members and a base frame 2.
  • a first leg unit 4 comprising two spaced apart parallel inner legs connected at one end to the base frame 2 by means of a fixed pivot 7 and at the other end by a freely rotatable roller 8 rotating on a central pivot and contacting the platform 1, and a second leg unit 3 comprising two parallel spaced apart outer leg members connected at one end to the platform 1 by means of a fixed pivot 5 and at the other end by a freely rotatable roller 6 rotating on a central pivot and contacting the base frame 2.
  • the inner and outer legs 3,4 are connected to each other by a common pivot 9.
  • At least one ram 10, preferably hydraulically actuated, is freely pivoted at one end to a transverse member 13 rigidly connecting the two inner leg members 4 and at its other end to a pivot 15 at the end of an arm member 11.
  • the other end of arm member 11 comprises one or more freely rotatable roller 12 rotating on a central pivot and contacting the inner scissor legs 4.
  • Arm member 11 rotates about a pivot 14 on a connecting member between the outer legs.
  • the arrangement ofthe arm 11 and the pivots 14 and 15 causes the arm member 11 to rotate about the pivot 14 and assist the opening of the leg members 3,4 about the central pivot 9, reducing the force F required about the central pivot 9 to raise the platform.
  • the ram pivot point 15 may be positioned anywhere between the pivot point 14 and the free end 16 of arm 11.
  • F is the ram force needed to spread the legs 3,4 apart
  • y is the lever arm, i.e. the perpendicular distance between the axis of the ram 10 and a line parallel to the axis of the ram 10 which intersects the axis of the pivot 14
  • m is the horizontal distance between the centre of the roller 12 and the fulcrum pivot 14 of the arm member
  • Z is the resulting force applied to the scissor leg member 4.
  • the arm 11 may be disposed in other arrangements which also reduce the ram force required. It may, for instance, contact the load platform 1 or base 2 directly (via roller means 12 for example), or may pivot on leg 4 and contact leg 3.
  • Figure 3 shows an alternative embodiment in which like components to that of Figure 2 have been accorded like numbers.
  • the mechanism is virtually identical to that shown in Figure 2 apart from being inverted.
  • the forces involved are therefore similar to those of the first embodiment but acting in the opposite direction (e.g. Force F has a downward component).
  • the result is the same; the legs are caused to spread and the platform lifts.
  • leg and leg unit used herein encompass units having two or more parallel leg members and spacing or connecting means between them. Parts which pivot at or contact the legs may of course pivot at or contact any part of the leg unit or leg assembly.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Ladders (AREA)
EP99301122A 1998-02-21 1999-02-16 Scherenhebevorrichtungen Withdrawn EP0937677A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9803600 1998-02-21
GBGB9803600.7A GB9803600D0 (en) 1998-02-21 1998-02-21 Scissor lifts

Publications (2)

Publication Number Publication Date
EP0937677A2 true EP0937677A2 (de) 1999-08-25
EP0937677A3 EP0937677A3 (de) 2002-12-11

Family

ID=10827319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99301122A Withdrawn EP0937677A3 (de) 1998-02-21 1999-02-16 Scherenhebevorrichtungen

Country Status (2)

Country Link
EP (1) EP0937677A3 (de)
GB (1) GB9803600D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001027499A1 (en) * 1999-10-12 2001-04-19 Snap-On Technologies, Inc. Low-level lift
WO2015177233A1 (en) * 2014-05-22 2015-11-26 Fiorese Marta Vehicle lift

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105967098A (zh) * 2016-07-05 2016-09-28 宿州市航宇塑胶贸易有限公司 一种气动升降装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899172A (en) * 1959-08-11 cresci
DE9205900U1 (de) * 1992-05-07 1992-10-01 Otto Nußbaum GmbH & Co KG, 7640 Kehl Hebebühne mit Spreizhebel
EP0613852A1 (de) * 1993-03-02 1994-09-07 Hydraulik Techniek Scherenhubtisch
EP0697367A1 (de) * 1994-08-16 1996-02-21 MAHA Maschinenbau Haldenwang GmbH & Co. KG Scheren-Hebebühne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899172A (en) * 1959-08-11 cresci
DE9205900U1 (de) * 1992-05-07 1992-10-01 Otto Nußbaum GmbH & Co KG, 7640 Kehl Hebebühne mit Spreizhebel
EP0613852A1 (de) * 1993-03-02 1994-09-07 Hydraulik Techniek Scherenhubtisch
EP0697367A1 (de) * 1994-08-16 1996-02-21 MAHA Maschinenbau Haldenwang GmbH & Co. KG Scheren-Hebebühne

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001027499A1 (en) * 1999-10-12 2001-04-19 Snap-On Technologies, Inc. Low-level lift
JP2003513868A (ja) * 1999-10-12 2003-04-15 スナップ−オン・テクノロジイズ・インク 低レベルジャッキ
US6601826B1 (en) 1999-10-12 2003-08-05 Snap-On Technologies, Inc. Low-level lift
WO2015177233A1 (en) * 2014-05-22 2015-11-26 Fiorese Marta Vehicle lift
CN106715319A (zh) * 2014-05-22 2017-05-24 马尔塔·菲奥雷塞 车辆抬升器
US10189690B2 (en) 2014-05-22 2019-01-29 Marta Fiorese Vehicle lift
CN106715319B (zh) * 2014-05-22 2019-11-12 马尔塔·菲奥雷塞 车辆抬升器

Also Published As

Publication number Publication date
EP0937677A3 (de) 2002-12-11
GB9803600D0 (en) 1998-04-15

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