A displacement arrangement for use in a combination dolly-pallet includes an impelling member movable between first and second positions. A linkage is pivotally connected to the impelling member. When the impelling member moves between the first and second positions, the linkage moves pivotally rela
A displacement arrangement for use in a combination dolly-pallet includes an impelling member movable between first and second positions. A linkage is pivotally connected to the impelling member. When the impelling member moves between the first and second positions, the linkage moves pivotally relative to the impelling member to an extended position.
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1. A displacement arrangement for use in a combination dolly-pallet, the displacement arrangement comprising: an impelling member movable between first and second positions;a linkage pivotally connected to the impelling member, whereby, when the impelling member moves between the first and second po
1. A displacement arrangement for use in a combination dolly-pallet, the displacement arrangement comprising: an impelling member movable between first and second positions;a linkage pivotally connected to the impelling member, whereby, when the impelling member moves between the first and second positions, the linkage moves pivotally relative to the impelling member between closed and open positions;a return assembly for returning the impelling member from the second position to the first position, thereby pivotally moving the linkage relative to the impelling member to the closed position; anda lever arrangement pivotally movable from a rest position, and a cam arrangement to transmit a force from the lever arrangement to the impelling member to drive the impelling member from the first position to the second position;wherein the cam arrangement comprises:an elongate rotatable main part; anda drive formation configured to slidably engage the lever arrangement, the drive formation being configured so that movement of the lever arrangement from the rest position can urge the drive formation and thereby rotate the cam arrangement in a drive direction to urge the impelling member to the second position. 2. A displacement arrangement according to claim 1, wherein the impelling member has a connecting part and a holding part, the connecting part being configured to allow the impelling member to be connected to another impelling member. 3. A displacement arrangement according to claim 2, wherein the holding part comprises two arms extending from the connecting part, the linkage being provided between the arms of the holding part, and the linkage being pivotally attached to the holding part. 4. A displacement arrangement according to claim 1, wherein the lever arrangement is pivotally movable between a rest position and an operative position, the lever arrangement applying said force to the cam arrangement when the lever arrangement moves from the rest position, and wherein the cam arrangement comprises an urging formation for urging the impelling member between the first position and the second position, the urging formation extending radially from the main part to be received by the impelling member. 5. A displacement arrangement according to claim 4, wherein the drive formation extends radially outwardly from the main part to engage the lever arrangement. 6. A displacement arrangement according to claim 5, wherein the lever arrangement comprises a fixed drive lever which is fixedly attached to the cam arrangement, the fixed drive lever being rotatable in the drive direction to rotate the cam arrangement in the drive direction. 7. A displacement arrangement according to claim 4, wherein the impelling member has a holding part comprising two arms, and wherein the impelling member includes a pair of cross members extending between the arms of the holding part, the urging formation being received between the cross members, whereby the urging formation engages one of the cross members of the impelling member to urge the impelling member to the second position, and the urging formation engages the other of the cross members of the impelling member to urge the impelling member towards the first position. 8. A displacement arrangement according to claim 1, wherein the return assembly comprises a return lever and a return formation, the return formation extending radially outwardly from the main part of the cam arrangement, and the return lever being movable from a rest position of the return lever to an operative position of the return lever to urge the return formation and thereby to urge the impelling member towards the first position. 9. A displacement arrangement according to claim 8, wherein the return assembly comprises a further cam arrangement for urging the impelling members from the second position to the first position, the further cam arrangement including a further main part and a further return formation extending radially outwardly from the further main part. 10. A displacement arrangement according to claim 9, wherein the return assembly includes a further return lever movable from a rest position of the further return lever to an operative position of the further return lever to urge the further return formation and thereby to urge the impelling member towards the first position. 11. A displacement arrangement according to claim 9, wherein the return assembly comprises a fixed return lever which is fixedly attached to the further cam arrangement, the fixed return lever being rotatable in a return direction to rotate the further cam arrangement also in the return direction and move the impelling member towards the first position. 12. A displacement arrangement according to claim 1, wherein the linkage comprises an upper link member and a lower link member, each link member being pivotally attached to the respective impelling member. 13. A displacement arrangement according to claim 12, including a reaction portion, wherein the upper link member extends from the impelling member to the reaction portion, the upper link member being pivotally attached to the reaction portion, and wherein the lower link member extends from the impelling member to a ground engaging arrangement, the lower link member being pivotally attached to the ground engaging arrangement. 14. A displacement arrangement according to claim 12, wherein when the impelling member is in the first position, the upper and lower link members extend along the impelling member, and when the impelling member is in the second position, the upper and lower link members extend transverse to the impelling member. 15. A displacement arrangement according to claim 13, wherein when the impelling member moves to the second position to move the ground engaging arrangement to a ground engaging position, each of the upper and lower link members moves to an over centre position beyond a position in which the upper and lower link members are aligned with the each other, thereby locking the ground engaging arrangement in said ground engaging position. 16. A support assembly comprising: a displacement arrangement as claimed in claim 1; a ground engaging arrangement associated with the displacement arrangement, the ground engaging arrangement being movable between a ground engaging position and a retracted position; and a reaction portion; wherein the linkage extends between the reaction portion and the ground engaging arrangement; whereby, when the impelling member moves between the first and second positions, the linkage moves pivotally relative to the impelling member to move the ground engaging arrangement between the retracted position and the ground engaging position. 17. A support assembly according to claim 16, wherein the displacement arrangement further includes a guide arrangement to guide the aforesaid pivoting movement of the linkage relative to the impelling member, the guide arrangement extending from the reaction portion to the ground engaging arrangement. 18. A support assembly according to claim 17, wherein the guide arrangement comprises an elongate guide member, the guide member extending through the respective ground engaging arrangement, and wherein the guide arrangement comprises a resilient member to move the ground engaging arrangement to the retracted position from the ground engaging position, whereby when said impelling member moves from the second position towards the first position, the resilient member moves the ground engaging arrangement to the retracted position. 19. A support assembly according to claim 18, wherein the guide arrangement includes a head attached to a lower end of the guide member, the resilient member extending from the head along the guide member to the ground engaging arrangement, and wherein the resilient member urges the ground engaging arrangement towards the reaction portion. 20. A support assembly according to claim 18, comprising first and second of the displacement arrangements and first and second of the ground engaging arrangements associated respectively with the first and second displacement arrangements, and the support assembly further comprises an elongate bearer portion having a substantially flat lower surface, and wherein each displacement arrangement further includes an upwardly extending mounting member attached to the bearer portion at the opposite ends of the bearer portion to mount the bearer portion on a body of the combination dolly-pallet. 21. A support assembly according to claim 17, wherein the ground engaging arrangement comprises a shield portion defining a cavity, and wherein the displacement arrangement further includes an upwardly extending mounting member, the shield portion being attached to the mounting member and extending laterally therefrom, the mounting member defining a guide cavity in which the guide arrangement is received. 22. A support assembly according to claim 16, wherein the ground engaging arrangement comprises a ground engaging member and an attachment member attached to the ground engaging member, the linkage being pivotally attached to the attachment member. 23. A support assembly according to claim 22, wherein a compression member is provided on the ground engaging member, the compression member being compressed when the ground engaging member engages the ground. 24. A support assembly according to claim 23, wherein the compression member is disposed between the ground engaging member and the attachment member. 25. A combination dolly-pallet comprising a body, a plurality of the support assemblies as claimed in claim 16 mounted on the body; and a drive assembly for driving the support assemblies.
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이 특허에 인용된 특허 (14)
Nordskog ; Robert A., Brake and tie-down mechanism.
Figel, Gregory J.; Rudolf, Kenneth Q.; Albersmeyer, David A.; Heimbrock, Richard Henry; Walke, James L.; Michael, Brian P.; Suttman, Glenn C.; Turner, Jonathan D.; Wiggins, Brian T.; Weiler, Martin D., Stretcher having hand actuated caster braking apparatus.
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