EP2045204A1 - Scissor lift - Google Patents

Scissor lift Download PDF

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Publication number
EP2045204A1
EP2045204A1 EP08165753A EP08165753A EP2045204A1 EP 2045204 A1 EP2045204 A1 EP 2045204A1 EP 08165753 A EP08165753 A EP 08165753A EP 08165753 A EP08165753 A EP 08165753A EP 2045204 A1 EP2045204 A1 EP 2045204A1
Authority
EP
European Patent Office
Prior art keywords
pivot
leg
centre
rotatable roller
load carrying
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
EP08165753A
Other languages
German (de)
French (fr)
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EP2045204B1 (en
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.)
Kone Corp
Original Assignee
UK Lift Co Ltd
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Filing date
Publication date
Application filed by UK Lift Co Ltd filed Critical UK Lift Co Ltd
Publication of EP2045204A1 publication Critical patent/EP2045204A1/en
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Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
    • 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

Definitions

  • This invention relates to a scissor lift.
  • the prior art scissor lift in Figure 1 is shown in the open, raised position with the platform and scissor legs superimposed, in dashed lines, in the lowered position. It comprises an inner scissor leg 1 comprising a pair of leg members spaced apart by rigid connecting member 5 and attached at one end to a lower frame 7 by fixed pivot 12 and at the opposite end is provided with a freely rotatable roller 15 which contacts an upper load carrying platform 8 and an outer scissor leg 2, comprising a pair of leg members spaced apart by rigid connecting member 4 and attached at one end to the upper load carrying platform 8 by a fixed pivot 13 and at the opposite end is provided with a freely rotatable wheel 14 which contacts the lower frame 7.
  • the inner and outer legs 1 and 2 are interconnected by a common pivot 3.
  • At least one extendable force member or ram 6 connected at one end by a pivot means 17 to the inner scissor leg connecting member 5 and connected at the other end by a pivot means 16 to the outer scissor leg connecting member 4 such that when the force member 6 is extended or retracted the legs 1 and 2 rotate in opposite directions about the central pivot 3 causing the load carrying platform 8 to raise and lower.
  • a scissor lift comprising a load carrying platform, a base frame, a first and second leg unit situated between the platform and the 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 contacting the base frame; 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 contacting the underside of the load carrying platform, wherein the distance between the first fixed pivot means and the interconnecting pivot and the distance between the first freely rotatable roller means and the interconnecting pivot are different and the centre of the first fixed pivot being above the line of an axis passing through the centre of the first freely rotatable roller means and the centre of the said interconnecting pivot, and wherein the distance between the second fixed pivot means and the interconnecting pivot and the second rot
  • the invention provides a scissor lift comprising one or more of the novel features and/or combinations of features herein disclosed.
  • a scissor lift embodying the invention is shown in Figures 2a , 2b and 3 .
  • Components having similar functions to those of the lift of Figure 1 have been given like reference numerals.
  • the scissor lift in Figures 2a and 2b comprises a load carrying platform with bracing members 8 and with an upright member 9 housing a force member 10 and a base frame 7.
  • a first leg 1 comprising two spaced apart parallel outer leg members with a connecting member 4, each outer leg member being connected at one end to the load carrying platform 8 by means of a fixed pivot 13 and at the other end provided with freely rotating roller 14 rotating on a central pivot and contacting the base frame 7
  • a second leg 2 comprising two spaced apart parallel inner leg members with a connecting member 5 each inner leg being connected at one end to the base frame by a fixed pivot 12 and at the other end provided with a freely rotatable roller 15 rotating on a central pivot and contacting the load carrying platform 8.
  • the outer leg 1 and the inner leg 2 are connected to and rotate about a common pivot 3 and at least one extending force member, ram 16 is pivotally connected between connecting members 4 and 5 by pivots 16 and 17 respectively.
  • ram 16 is pivotally connected between connecting members 4 and 5 by pivots 16 and 17 respectively.
  • Figure 3 shows the arrangement of the pivots 13, 14 of the inner leg 1 and pivots15, 16 of the outer leg 2 and connected to each other by a common pivot 3. It can be seen that the pivot 13 is off set from the projected line of an axis passing through pivots 14 and 3 respectively and that pivot 15 is off set from the projected line of an axis passing through pivots 12 and 3 respectively. Furthermore, the distance between the pivots 14 and 3 of outer leg 1 are greater than the distance between the pivots 13 and 3 and the distance between the pivots 12 and 3 of the inner leg 2 are greater than the distance between the pivots 15 and 3.
  • the offsetting in this embodiment is done by mounting the pivots 13 and 15 on projecting or protruding parts 21, 22 respectively at the ends of the legs remote from pivots 14 and 12 respectively. These may extend generally outwardly as shown from the elongate direction of each leg, preferably at 90° although they may be at other non-zero angles to the longitudinal leg axis. They may be protruding bosses or protrusions as shown.
  • inner and outer legs could of course be varied or transposed so that references to an 'inner' leg could be an outer leg and vice versa, ie the arrangement could be reversed or otherwise altered.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

A scissor lift comprising a load carrying platform, a base frame (7), a first and second leg unit situated between the platform and the frame, the leg units crossing each other at an axis (3) and being pivotally interconnected at said axis (3), the first leg (1) being connected at one end to the load carrying platform by first fixed pivot means (13) and provided at the other end with first freely rotatable roller means (14) contacting the base frame (7); the second leg unit (2) being connected at one end to the base frame by second fixed pivot means (12) and provided at the other end with second freely rotatable roller means (15) contacting the underside of the load carrying platform, wherein the distance between the first fixed pivot means (13) and the inter connecting pivot (3) and the distance between the first freely rotatable roller means (14) and the interconnecting pivot axis (3) are different and the centre of the first fixed pivot (13) being above the line of an axis passing through the centre of the first freely rotatable roller means (14) and the centre of the said interconnecting pivot (3), and wherein the distance between the second fixed pivot means (12) and the interconnecting pivot (3) and the second rotatable roller means (15) and connecting pivot are different and the centre of the second fixed pivot means (12) being above a line projected from a straight axis passing through the centre of the second freely rotatable roller and the centre of the interconnecting pivot.

Description

  • This invention relates to a scissor lift.
  • An example of a scissor lift is shown in GB 2 178 726 A . The present invention arose in an attempt to provide an improvement over the lift disclosed in this patent application.
  • The prior art scissor lift in Figure 1 is shown in the open, raised position with the platform and scissor legs superimposed, in dashed lines, in the lowered position. It comprises an inner scissor leg 1 comprising a pair of leg members spaced apart by rigid connecting member 5 and attached at one end to a lower frame 7 by fixed pivot 12 and at the opposite end is provided with a freely rotatable roller 15 which contacts an upper load carrying platform 8 and an outer scissor leg 2, comprising a pair of leg members spaced apart by rigid connecting member 4 and attached at one end to the upper load carrying platform 8 by a fixed pivot 13 and at the opposite end is provided with a freely rotatable wheel 14 which contacts the lower frame 7. The inner and outer legs 1 and 2 are interconnected by a common pivot 3. There is also at least one extendable force member or ram 6 connected at one end by a pivot means 17 to the inner scissor leg connecting member 5 and connected at the other end by a pivot means 16 to the outer scissor leg connecting member 4 such that when the force member 6 is extended or retracted the legs 1 and 2 rotate in opposite directions about the central pivot 3 causing the load carrying platform 8 to raise and lower.
    It is shown in the scissor lift disclosed in GB 2 178 276 A that it is in some cases desirable to reduce the height of the load carrying platform 8 above the ground when in the fully lowered position and that when in the lowest possible position the axes of the inner and outer scissor leg members are parallel or nearly parallel to each other such that the opening force of the member 6 acting about the central pivot 3 is required to be very large. This disadvantage is successfully overcome by providing one or more additional force members 10 acting at one upper end on a member 9 attached to the load carrying platform 8 and acting at the other lower end on the lower frame 7 and preferably through an extension 11 to the lower frame so that the force required by the member 10 to cause the scissor lift to rise is only that which is required to overcome the weight of the load and the load carrying platform and the scissor legs with no mechanical disadvantage. As the scissor leg members 1 and 2 rotate about the common connecting pivot 3 the position of the pivots 16 and 17 changes in relation to the common connecting pivot 3 such that the distance between line of action of the force member 6 about the common connecting pivot 3 increases thus improving the mechanical advantage of the force member 6.
  • It is a feature of the prior art scissor lift described that the position of the common connecting pivot 3 of the scissor leg members 1 and 2 is not centrally positioned between the fixed pivots 12 and 13 and the rollers 15 and 16 respectively to allow the inner and outer scissor legs 1 and 2 to nest with each other when the scissor lift is fully lowered. A disadvantage of this arrangement is that during the raising and lowering of the load carrying platform the path along which the pivot connection 13 between scissor leg 2 and the load carrying platform 8 travels is not vertical but is displaced horizontally causing the load carrying platform also to move horizontally during raising and lowering of the scissor lift as shown in Figure 1.
  • The present invention arose in an attempt to avoid the disadvantages of the described prior art scissor lift. This is achieved by a scissor lift according to the invention having the features claimed in the appended claims.
  • According to the present invention, in one aspect, there is provided a scissor lift comprising a load carrying platform, a base frame, a first and second leg unit situated between the platform and the 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 contacting the base frame; 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 contacting the underside of the load carrying platform, wherein the distance between the first fixed pivot means and the interconnecting pivot and the distance between the first freely rotatable roller means and the interconnecting pivot are different and the centre of the first fixed pivot being above the line of an axis passing through the centre of the first freely rotatable roller means and the centre of the said interconnecting pivot, and wherein the distance between the second fixed pivot means and the interconnecting pivot and the second rotatable roller means and connecting pivot are different and the centre of the second fixed pivot means being above a line projected from a straight axis passing through the centre of the second freely rotatable roller and the centre of the interconnecting pivot.
  • Other aspects of the invention are claimed and/or disclosed in the specification and drawings.
  • In a further aspect the invention provides a scissor lift comprising one or more of the novel features and/or combinations of features herein disclosed.
  • Embodiments of the invention will now be described by way of example, with reference to the accompanying drawings, in which:
    • Figure 1 is a side elevation of a previously proposed scissor lift;
    • Figure 2a is a side elevation of a scissor lift according to the invention in a raised position;
    • Figure 2b is a side elevation of the scissor lift of Figure 2a in a lowered position; and
    • Figure 3 is a diagrammatic representation the scissor leg arrangement in the partly raised position.
  • A scissor lift embodying the invention is shown in Figures 2a, 2b and 3. Components having similar functions to those of the lift of Figure 1 have been given like reference numerals.
  • The scissor lift in Figures 2a and 2b comprises a load carrying platform with bracing members 8 and with an upright member 9 housing a force member 10 and a base frame 7. Between the platform 8 and the base frame 7 is arranged a first leg 1 comprising two spaced apart parallel outer leg members with a connecting member 4, each outer leg member being connected at one end to the load carrying platform 8 by means of a fixed pivot 13 and at the other end provided with freely rotating roller 14 rotating on a central pivot and contacting the base frame 7 and a second leg 2 comprising two spaced apart parallel inner leg members with a connecting member 5 each inner leg being connected at one end to the base frame by a fixed pivot 12 and at the other end provided with a freely rotatable roller 15 rotating on a central pivot and contacting the load carrying platform 8. The outer leg 1 and the inner leg 2 are connected to and rotate about a common pivot 3 and at least one extending force member, ram 16 is pivotally connected between connecting members 4 and 5 by pivots 16 and 17 respectively. As the said extending force member 6 is extended and retracted the inner and outer legs 1 and 2 rotate about the common pivot 3 causing the load carrying platform 8 to raise and lower.
  • Figure 3 shows the arrangement of the pivots 13, 14 of the inner leg 1 and pivots15, 16 of the outer leg 2 and connected to each other by a common pivot 3. It can be seen that the pivot 13 is off set from the projected line of an axis passing through pivots 14 and 3 respectively and that pivot 15 is off set from the projected line of an axis passing through pivots 12 and 3 respectively. Furthermore, the distance between the pivots 14 and 3 of outer leg 1 are greater than the distance between the pivots 13 and 3 and the distance between the pivots 12 and 3 of the inner leg 2 are greater than the distance between the pivots 15 and 3.
  • The offsetting in this embodiment is done by mounting the pivots 13 and 15 on projecting or protruding parts 21, 22 respectively at the ends of the legs remote from pivots 14 and 12 respectively. These may extend generally outwardly as shown from the elongate direction of each leg, preferably at 90° although they may be at other non-zero angles to the longitudinal leg axis. They may be protruding bosses or protrusions as shown.
  • The arrangement of inner and outer legs, could of course be varied or transposed so that references to an 'inner' leg could be an outer leg and vice versa, ie the arrangement could be reversed or otherwise altered.
  • It can be ascertained in Figure 1 that due to the dissimilar distances between the connecting pivot 3 and the fixed pivots 13 and 12 and the dissimilar distances between the connecting pivot 3 and the freely rotatable roller pivots 14 and 15 the load carrying platform 8 will not travel in a truly vertical path when the said pivots 13, 3 and 14 lay on a common axis and the pivots 15, 3 and 12 lay on a common axis. However it can be shown that the offsetting of the pivot 13 from an axis projecting through pivots 14 and 3 on the outer leg 1 (shown most clearly in Figure 3) and the offsetting of the pivot 15 from an axis projecting through pivots 12 and 3 of the inner leg 2 as shown in Figure 3 will reduce the horizontal movement and a person skilled in the art of scissor lift design can easily arrange the said pivots 13, 3 and 14 of the outer leg 1 and the said pivots 15, 3 and 16 of the inner leg 2 to reduce or virtually eliminate the horizontal movement of the load carrying platform 8 and hence reduce the undesirable forces induced on the lifting member 10.

Claims (5)

  1. A scissor lift comprising a load carrying platform, a base frame, a first and second leg unit situated between the platform and the 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 contacting the base frame; 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 contacting the underside of the load carrying platform, wherein the distance between the first fixed pivot means and the interconnecting pivot and the distance between the first freely rotatable roller means and the interconnecting pivot are different and the centre of the first fixed pivot being above the line of an axis passing through the centre of the first freely rotatable roller means and the centre of the said interconnecting pivot, and wherein the distance between the second fixed pivot means and the interconnecting pivot and the second rotatable roller means and connecting pivot are different and the centre of the second fixed pivot means being above a line projected from a straight axis passing through the centre of the second freely rotatable roller and the centre of the interconnecting pivot.
  2. A scissor lift as claimed in Claim 1, where at least one extending force member is permanently attached to, or acts on, at one of its ends to the base frame or an extension to it and is permanently attached or acts on at the other end to the load carrying platform or an extension to it.
  3. A scissor lift as claimed in Claim 1 or 2, where at least one extending force member is pivotally connected to, or acts on, at one end the said first leg member and at the other end is pivotally connected, or acts on, the said second leg member.
  4. A scissor lift as claimed in Claim 3, where at least one said extending force member is pivotally connected at one end to the load carrying platform or an extension to it and the other end acts on the base frame or an extension to it for a part or all of the movement of the platform.
  5. A scissor lift as claimed in Claim 3, where at least one said extending force member is pivotally connected at one end to the base frame or an extension to it and the other end acts on the load carrying platform or an extension to it for a part of the movement of the platform.
EP20080165753 2007-10-02 2008-10-02 Scissor lift Not-in-force EP2045204B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0719106A GB0719106D0 (en) 2007-10-02 2007-10-02 Scissor lift

Publications (2)

Publication Number Publication Date
EP2045204A1 true EP2045204A1 (en) 2009-04-08
EP2045204B1 EP2045204B1 (en) 2012-06-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080165753 Not-in-force EP2045204B1 (en) 2007-10-02 2008-10-02 Scissor lift

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EP (1) EP2045204B1 (en)
GB (1) GB0719106D0 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103762520A (en) * 2014-02-21 2014-04-30 国网湖南省电力公司带电作业中心 Electric mobile platform for bypass work of 10 KV distribution line
CN105217514A (en) * 2015-10-20 2016-01-06 四川长虹电器股份有限公司 Self-raising platform
CN105337211A (en) * 2015-11-20 2016-02-17 国家电网公司 Hot-line work operating platform with remote command function
CN107324241A (en) * 2017-08-01 2017-11-07 苏州大激自动化科技有限公司 Yardage roll lifting transporting trolley
CN108115576A (en) * 2018-01-03 2018-06-05 广东东箭汽车科技股份有限公司 A kind of carrying platform elevator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0167434A1 (en) * 1984-06-06 1986-01-08 Société Industrielle d'Equipement Technique d'Appareils de Manutention Lifting table, especially for heavy loads
GB2178276A (en) 1983-04-14 1987-02-04 Control Data Corp Method and apparatus for detecting the channel to which a television receiver system is tuned
GB2178726A (en) 1985-08-03 1987-02-18 Uk Lift Company Limited The Scissor lift
DE9205900U1 (en) * 1992-05-07 1992-10-01 Otto Nußbaum GmbH & Co KG, 7640 Kehl Lifting platform with spreading lever
DE9413187U1 (en) * 1994-08-16 1994-10-13 Maschinenbau Haldenwang GmbH & Co KG, 87490 Haldenwang Scissor lift

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2178276A (en) 1983-04-14 1987-02-04 Control Data Corp Method and apparatus for detecting the channel to which a television receiver system is tuned
EP0167434A1 (en) * 1984-06-06 1986-01-08 Société Industrielle d'Equipement Technique d'Appareils de Manutention Lifting table, especially for heavy loads
GB2178726A (en) 1985-08-03 1987-02-18 Uk Lift Company Limited The Scissor lift
DE9205900U1 (en) * 1992-05-07 1992-10-01 Otto Nußbaum GmbH & Co KG, 7640 Kehl Lifting platform with spreading lever
DE9413187U1 (en) * 1994-08-16 1994-10-13 Maschinenbau Haldenwang GmbH & Co KG, 87490 Haldenwang Scissor lift

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103762520A (en) * 2014-02-21 2014-04-30 国网湖南省电力公司带电作业中心 Electric mobile platform for bypass work of 10 KV distribution line
CN105217514A (en) * 2015-10-20 2016-01-06 四川长虹电器股份有限公司 Self-raising platform
CN105337211A (en) * 2015-11-20 2016-02-17 国家电网公司 Hot-line work operating platform with remote command function
CN105337211B (en) * 2015-11-20 2017-08-25 国家电网公司 A kind of livewire work operating desk for possessing remote command function
CN107324241A (en) * 2017-08-01 2017-11-07 苏州大激自动化科技有限公司 Yardage roll lifting transporting trolley
CN107324241B (en) * 2017-08-01 2022-11-01 常熟市中捷台板厂 Yardage roll lifting carrying trolley
CN108115576A (en) * 2018-01-03 2018-06-05 广东东箭汽车科技股份有限公司 A kind of carrying platform elevator

Also Published As

Publication number Publication date
EP2045204B1 (en) 2012-06-20
GB0719106D0 (en) 2007-11-14

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