EP1756000A1 - Collapsible scissor construction - Google Patents
Collapsible scissor constructionInfo
- Publication number
- EP1756000A1 EP1756000A1 EP05749176A EP05749176A EP1756000A1 EP 1756000 A1 EP1756000 A1 EP 1756000A1 EP 05749176 A EP05749176 A EP 05749176A EP 05749176 A EP05749176 A EP 05749176A EP 1756000 A1 EP1756000 A1 EP 1756000A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- scissor construction
- arm
- adjusting means
- fulcrum
- scissor
- 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- Withdrawn
Links
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
- the present invention relates to a scissor construction comprising pivotable arms and arm adjusting means that are pivotally connected to the scissor construction on one side and to a fulcrum on the other side.
- the invention furthermore relates to a lifting mechanism and to a finished product or a device provided with a lifting mechanism.
- Such a scissor construction in an embodiment in which it is used as a lifting mechanism, is known from European patent application No. EP-A-0 613 852.
- the known scissor construction comprises arms provided with arm adjusting means, which pivot about a cross joint.
- the pivotable arms can be unfolded from a collapsed position of the scissor construction and be folded again by the arm adjusting means.
- the arm adjusting means comprise one or more hydraulic cylinder units, which cylinder unit (s) is (are) pivotally connected to one end of an arm on one side and to a plate member on the other side.
- both the plate member and a respective elongated cylinder unit extend at an albeit small but not negligible angle. Said angle is important because the cylinder unit can derive a reaction force from the fact that the magnitude of said angle is not negligible, which reaction force is needed for adjusting and unfolding the arms of the scissor construction from the collapsed condition by means of a moment that has been generated therewith.
- a drawback of the known scissor construction is the fact that the arm adjusting means, which extend at a certain angle, add to a minimal but nevertheless considerable height of the scissor construction in the collapsed condition thereof, as a result of which said scissor construction is not suitable for all kinds of possible applications.
- the object of the present invention is to provide a constructionally improved scissor construction having a minimal height .
- the scissor construction according to the invention is characterized in that the fulcrum is positioned such that it lies in the plane between the ends of the pivotable arms in any adjusted position of said pivotable arms.
- the advantage of the scissor construction according to the invention is that the arm adjusting means push off on a fulcrum that is located between the ends of the arms over the entire adjusting range. As a result, the arm adjusting means will take up a flat position between said ends in the collapsed condition of the scissor construction, so that a device provided with the scissor construction according to the invention will exhibit a minimal overall height or depth.
- the force to be applied by the arm adjusting means can be significantly reduced, especially in the case of a small scissoring angle. As a result, the finished product can be made lighter, and generally it can be produced at a lower cost price in practice, therefore, whilst retaining the level of reliability.
- One embodiment of the scissor construction according to the invention is characterized in that the scissor construction comprises one or more horizontal members arranged between the arm ends, on which the fulcrum is slidably supported.
- the advantage of this embodiment is that the fulcrum that is slidably supported between the ends of the arms leads to an angle between the arm adjusting means and the horizontal that slidably adjusts itself by sliding in an advantageous manner upon unfolding of the scissor construction. This leads to a more uniform exertion of forces during adjustment, as a result of which a light construction can be used whilst improving the stability, also during said adjustment.
- One embodiment of the scissor construction according to the invention is characterized in that the arm adjusting means are coupled to a pivot point of the pivotable arms on one side, whilst another embodiment of the scissor construction is characterized in that the arm adjusting means are coupled to a point on one of the pivotable arms on one side, in which case longer arm adjusting means may be used, if desired, which may even comprise one or more gas springs, possibly provided on either side thereof. Further variants and advantageous embodiments are defined in the dependent claims.
- FIG. 1 and 2 show a possible embodiment of the scissor construction according to the invention in two positions thereof;
- Figures 3 and 4 show the scissor construction according to the invention as shown in the preceding figures in partially collapsed and fully collapsed condition, respectively.
- Figures 1 and 2 show a scissor construction 1, in this case comprising a pair of pivotable arms 2-1, 2-2 (hereinafter jointly indicated by numeral 2) .
- the scissor construction 1 is provided with arm adjusting means 3.
- the arm adjusting means 3 may comprise one or more pneumatically, hydraulically or electrically operated, possibly remotely controlled adjusting means, if required. For specific applications, such as a footstool, lightweight gas springs are preferred.
- a lifting mechanism that comprises a scissor construction 1, such as a lifting table, a hydraulic arm, a car lift, a motorcycle lift, a jack or, for example, vertically adjustable furniture such as a (treatment) table or chair or a bed (usually on wheels) .
- the arm adjusting means 3 are pivotally coupled to a fulcrum A (yet to be explained) .
- the arm adjusting means 3 are furthermore pivotally connected to an end 4-1 of the pivotable arm 2-1.
- the arm adjusting means 3 might be coupled between the fulcrum A and, for example, the scissor point S or another point generally located on one of the arms 2-1, 2-2.
- the fulcrum A is positioned such that it lies in the plane between the lower arm ends (in this embodiment) 4-3 and 4-4 in any adjusted position of the pivotable arms 2.
- the fulcrum A is supported in a rail on the base, for example, in which one or more horizontal members 5 are present in this embodiment.
- the arm adjusting means 3 lie completely in the plane between the ends 4-1 and 4-2 that is defined by the folded arms 2.
- the overall depth of the scissor construction 1 is minimal, therefore.
- the fulcrum A is slidably mounted in the horizontal member (s) 5, whilst the arm adjusting means 3 form part of a triangular construction of which the fulcrum A forms a corner point.
- a pivotable connecting member 7 extends towards a connecting point 8 on the arm 2-1 as a side of the triangle.
- Said connecting point 8 is located slightly above the aforesaid plane (see figures 3 and 4) or the central axis H of the horizontal member 5, so that the arm adjusting means 3, in spite of their horizontal position in the collapsed condition of the scissor construction 1 (in this embodiment) , are nevertheless capable of generating a sufficiently large moment for folding and unfolding the scissor construction 1.
- the fulcrum A will start to move already, as a result of which the force that needs to be generated by the arm adjusting means 3 for opening the scissor construction further will quickly decrease.
- the connecting point 8 can engage the arm 2-1 at several positions, making it possible to influence the interplay of forces, especially in the aforesaid triangle, in dependence on the intended use of the scissor construction, if required.
Abstract
Disclosed is a scissor construction comprising pivotable arms (2) and arm adjusting means (3) that are pivotally connected to the scissor construction on one side and to a fulcrum (A) on the other side. The fulcrum is positioned such that it will lie in the plane between the ends (4-3,4-4) of the pivotable arms in any adjusted position of said arms. The arm adjusting means take up a flat position between said ends in the collapsed condition of the scissor construction, so that the height of the construction will be minimal in that condition. Moreover, the force to be applied by the arm adjusting means is significantly smaller, especially in the case of a small scissoring angle. An additional pivotable connecting member (7) is connected between the fulcrum and an arm in order to generate a lifting force when the scissor construction is collapsed.
Description
COLLAPSIBLE SCISSOR CONSTRUCTION
The present invention relates to a scissor construction comprising pivotable arms and arm adjusting means that are pivotally connected to the scissor construction on one side and to a fulcrum on the other side.
The invention furthermore relates to a lifting mechanism and to a finished product or a device provided with a lifting mechanism.
Such a scissor construction, in an embodiment in which it is used as a lifting mechanism, is known from European patent application No. EP-A-0 613 852. The known scissor construction comprises arms provided with arm adjusting means, which pivot about a cross joint. The pivotable arms can be unfolded from a collapsed position of the scissor construction and be folded again by the arm adjusting means. The arm adjusting means comprise one or more hydraulic cylinder units, which cylinder unit (s) is (are) pivotally connected to one end of an arm on one side and to a plate member on the other side. The plate member is mounted on the cross joint, whilst a fulcrum is present on the plate member itself, to which fulcrum the cylinder unit, which is capable of generating large forces, is attached. In the collapsed condition of the scissor construction, both the plate member and a respective elongated cylinder unit extend at an albeit small but not negligible angle. Said angle is important because the cylinder unit can derive a reaction force from the fact that the magnitude of said angle is not negligible, which reaction force is needed for adjusting and unfolding the arms of the scissor construction from the collapsed condition by means of a moment that has been
generated therewith.
A drawback of the known scissor construction is the fact that the arm adjusting means, which extend at a certain angle, add to a minimal but nevertheless considerable height of the scissor construction in the collapsed condition thereof, as a result of which said scissor construction is not suitable for all kinds of possible applications.
Another drawback is the fact that, in particular in the case of small scissoring angles, substantial forces occur in the construction, so that higher demands are made of the construction, leading to a heavy and costly scissor construction.
The object of the present invention is to provide a constructionally improved scissor construction having a minimal height .
In order to accomplish that object, the scissor construction according to the invention is characterized in that the fulcrum is positioned such that it lies in the plane between the ends of the pivotable arms in any adjusted position of said pivotable arms.
The advantage of the scissor construction according to the invention is that the arm adjusting means push off on a fulcrum that is located between the ends of the arms over the entire adjusting range. As a result, the arm adjusting means will take up a flat position between said ends in the collapsed condition of the scissor construction, so that a device provided with the scissor construction according to the invention will exhibit a minimal overall height or depth.
In addition to that it has become apparent that when the scissor construction according to the invention is used, the force to be applied by the arm adjusting means can be significantly reduced, especially in the case of a small scissoring angle. As a result, the finished product can be made lighter, and generally it can be produced at a lower cost price in practice, therefore, whilst retaining the level of reliability.
One embodiment of the scissor construction according to the invention is characterized in that the scissor construction comprises one or more horizontal members arranged between the arm ends, on which the fulcrum is slidably supported. The advantage of this embodiment is that the fulcrum that is slidably supported between the ends of the arms leads to an angle between the arm adjusting means and the horizontal that slidably adjusts itself by sliding in an advantageous manner upon unfolding of the scissor construction. This leads to a more uniform exertion of forces during adjustment, as a result of which a light construction can be used whilst improving the stability, also during said adjustment.
One embodiment of the scissor construction according to the invention is characterized in that the arm adjusting means are coupled to a pivot point of the pivotable arms on one side, whilst another embodiment of the scissor construction is characterized in that the arm adjusting means are coupled to a point on one of the pivotable arms on one side, in which case longer arm adjusting means may be used, if desired, which may even comprise one or more gas springs, possibly provided on either side thereof.
Further variants and advantageous embodiments are defined in the dependent claims.
The scissor construction according to the present invention will now be explained in more detail with reference to the figures below, in which like parts are indicated by the same numerals. In the drawing: Figures 1 and 2 show a possible embodiment of the scissor construction according to the invention in two positions thereof; Figures 3 and 4 show the scissor construction according to the invention as shown in the preceding figures in partially collapsed and fully collapsed condition, respectively.
Figures 1 and 2 show a scissor construction 1, in this case comprising a pair of pivotable arms 2-1, 2-2 (hereinafter jointly indicated by numeral 2) . In principle, several pairs of arms 2 can be stacked together so as to realise a larger range of the scissor construction 1. The scissor construction 1 is provided with arm adjusting means 3. The arm adjusting means 3 may comprise one or more pneumatically, hydraulically or electrically operated, possibly remotely controlled adjusting means, if required. For specific applications, such as a footstool, lightweight gas springs are preferred. Further possible applications can be found in various other products that include a lifting mechanism that comprises a scissor construction 1, such as a lifting table, a hydraulic arm, a car lift, a motorcycle lift, a jack or, for example, vertically adjustable furniture such as a (treatment) table or chair or a bed (usually on wheels) . The arm adjusting means 3 are pivotally coupled to a fulcrum A (yet to be explained) . In the embodiment of figures 1 and 2, the arm adjusting means 3 are furthermore
pivotally connected to an end 4-1 of the pivotable arm 2-1. In one embodiment (not shown) , the arm adjusting means 3 might be coupled between the fulcrum A and, for example, the scissor point S or another point generally located on one of the arms 2-1, 2-2. In all these cases the fulcrum A is positioned such that it lies in the plane between the lower arm ends (in this embodiment) 4-3 and 4-4 in any adjusted position of the pivotable arms 2. The fulcrum A is supported in a rail on the base, for example, in which one or more horizontal members 5 are present in this embodiment. When the opening angle of the scissor construction 1 changes, the angle between the arm adjusting means 3 and the horizontal will change as well, as a result of which the force that is generated by the adjusting means 3 upon unfolding of the scissor construction 1 is increasingly utilised to assist in the lifting of the load on the platform 6. Moreover, calculations have shown that in that case the differences between the forces that occur with different opening angles will be limited to factors rather than orders of magnitude as has been the case so far. This makes it possible to make the scissor construction 1 lighter in weight and thus produce it at a lower cost price. Moreover, the range of possible applications is thus increased. Figure 3 shows the embodiment of the scissor construction 1 in nearly collapsed condition, whilst figure and 4 shows the scissor construction in fully collapsed condition. As figure 4 shows, the arm adjusting means 3 lie completely in the plane between the ends 4-1 and 4-2 that is defined by the folded arms 2. The overall depth of the scissor construction 1 is minimal, therefore. In the illustrated embodiments of the scissor construction 1, the fulcrum A is slidably mounted in the horizontal member (s) 5, whilst the arm adjusting means 3 form part of a triangular construction of which the fulcrum
A forms a corner point. From said fulcrum A, a pivotable connecting member 7 extends towards a connecting point 8 on the arm 2-1 as a side of the triangle. Said connecting point 8 is located slightly above the aforesaid plane (see figures 3 and 4) or the central axis H of the horizontal member 5, so that the arm adjusting means 3, in spite of their horizontal position in the collapsed condition of the scissor construction 1 (in this embodiment) , are nevertheless capable of generating a sufficiently large moment for folding and unfolding the scissor construction 1. In the case of a small, increasing scissoring angle of the scissor construction 1, the fulcrum A will start to move already, as a result of which the force that needs to be generated by the arm adjusting means 3 for opening the scissor construction further will quickly decrease. The connecting point 8 can engage the arm 2-1 at several positions, making it possible to influence the interplay of forces, especially in the aforesaid triangle, in dependence on the intended use of the scissor construction, if required.
Claims
1. A scissor construction comprising pivotable arms with arm adjusting means that are pivotally coupled to the scissor construction on one side and to a fulcrum on the other side, characterized in that the fulcrum is positioned such that it lies in the plane between arm ends of the pivotable arms in any adjusted position of said pivotable arms .
2. A scissor construction according to claim 1, characterized in that the scissor construction comprises one or more horizontal members arranged between the arm ends, on which the fulcrum is slidably supported.
3. A scissor construction according to claim 1 or 2 , characterized in that the arm adjusting means are coupled to a pivot point of the pivotable arms on one side.
4. A scissor construction according to any one of the preceding claims, characterized in that the arm adjusting means are coupled to a point on one of the pivotable arms on one side.
5. A scissor construction according to any one of the claims 1-4, characterized in that the arm adjusting means form part of a triangular construction of which the fulcrum forms a corner point, and in that the arm adjusting means lie in that side of the triangle which, in the collapsed condition of the scissor construction, extends parallel to the plane defined by the collapsed arms.
6. A scissor construction according to claim 5, characterized in that the scissor construction comprises a pivotable connecting part that is arranged between the fulcrum and the arm in question.
7. A scissor construction according to claim 6, characterized in that the position at which the connecting member is connected to the arm is question is adjustable.
8. A scissor construction according to any one of the preceding claims, characterized in that the arm adjusting means comprise one or more gas springs.
9. A lifting mechanism provided with a scissor construction according to any one of the preceding claims.
10. A device such as a footstool, a lifting table, a hydraulic arm, a car lift, a motorcycle lift, a jack or vertically adjustable furniture, for example a treatment table or chair or bed, provided with a lifting mechanism according to claim 9.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1026457A NL1026457C2 (en) | 2004-06-18 | 2004-06-18 | Collapsible scissor construction. |
PCT/NL2005/000392 WO2005123568A1 (en) | 2004-06-18 | 2005-05-27 | Collapsible scissor construction |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1756000A1 true EP1756000A1 (en) | 2007-02-28 |
Family
ID=34969095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05749176A Withdrawn EP1756000A1 (en) | 2004-06-18 | 2005-05-27 | Collapsible scissor construction |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1756000A1 (en) |
NL (1) | NL1026457C2 (en) |
WO (1) | WO2005123568A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108275603A (en) * | 2018-03-26 | 2018-07-13 | 芜湖凯源汽车服务有限公司 | Automobile repairing bench |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110329949B (en) * | 2019-07-08 | 2021-03-30 | 永康中科爱司米医疗科技有限公司 | Cross connecting rod elevation structure, bedstead and nursing bed |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1349666A (en) * | 1963-02-27 | 1964-01-17 | elevator | |
FR2461629A1 (en) * | 1979-07-20 | 1981-02-06 | Balency Briard | Steerable supply type trolley - has hydraulically lifted platform tilting to remain horizontal on stairways and slopes |
US4712653A (en) * | 1985-08-14 | 1987-12-15 | Lift-R Technologies, Inc. | Energy-recycling scissors lift |
DE9302967U1 (en) * | 1993-03-02 | 1993-04-22 | Hydraulik Techniek, Emmen, Nl | |
US6672430B2 (en) * | 2001-07-09 | 2004-01-06 | Heidelberger Druckmaschinen Ag | Device and method for adjusting a force applied to a movable element |
-
2004
- 2004-06-18 NL NL1026457A patent/NL1026457C2/en not_active IP Right Cessation
-
2005
- 2005-05-27 EP EP05749176A patent/EP1756000A1/en not_active Withdrawn
- 2005-05-27 WO PCT/NL2005/000392 patent/WO2005123568A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2005123568A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108275603A (en) * | 2018-03-26 | 2018-07-13 | 芜湖凯源汽车服务有限公司 | Automobile repairing bench |
Also Published As
Publication number | Publication date |
---|---|
NL1026457C2 (en) | 2005-12-20 |
WO2005123568A1 (en) | 2005-12-29 |
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Legal Events
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