VARIABLE HEIGHT SUPPORT

摘要

A variable height support with a platform and a base supporting the platform and reconfigurable to selectively change a height of a support surface on the platform relative to a subjacent surface. A control assembly is operable to selectively: a) maintain the support surface at a selected height; and b) release the platform to allow the base to be reconfigured to change the height of the support surface. The control assembly has a ratchet subassembly that, with the control assembly in a first state, allows the base to be reconfigured by exerting a continuous upward force upon the platform that causes the platform to elevate and be blocked within a range at a plurality of different vertical locations against downward movement. The control assembly further has an actuator that is repositionable to change the control assembly into a second state wherein the platform can be lowered over the range.

主权项

1. A variable height support comprising:
a platform defining an upwardly facing support surface; a base for supporting the platform in an operative position upon a subjacent surface and reconfigurable to selectively change a height of the support surface relative to the subjacent surface; and a control assembly that is operable to selectively: a) maintain the support surface at a selected height; and b) release the platform to allow the base to be reconfigured to change the height of the support surface relative to the subjacent surface, wherein the control assembly comprises a ratchet subassembly that, with the control assembly in a first state, interacts between the platform and base to allow the base to be reconfigured by exerting a continuous upward force upon the platform that causes the platform to elevate relative to the subjacent surface over a range and be blocked within the range at a plurality of different vertical locations against downward movement relative to the subjacent surface, wherein the control assembly further comprises an actuator that is repositionable between a normal position and an actuated position thereby to change the control assembly from the first state into a second state wherein the platform can be lowered over the range.