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US 5,161,274 AGranted
Hospital bed with proportional height knee break
AssigneeJ. Nesbit-Evans & Co. Ltd.
InventorsStephen Hayes, Robert H. Jones
Life of this patent
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Abstract
An adjustable bed comprises a frame having a backrest arranged to be lifted by an actuator via a crank, and a thighrest similarly arranged to be lifted by an actuator. A legrest is freely pivoted to the thighrest. The angles of the parts are sensed and maintained in proportion by control means, so that as, for example, the backrest angle is steepened, the thighrest is also raised proportionately, but to less extent, taking the legrest with it.
Claims3
An adjustable bed assembly comprising:
- a mattress frame having a backrest portion and a legrest portion independently hinged to said frame for angular movement relative to said frame;
- first reversible motor means interconnecting said backrest portion and said frame for causing said angular movement thereof;
- second reversible motor means interconnecting said legrest portion and said frame for causing said angular movement thereof;
- and
- proportional control means for simultaneously controlling operation of said first and second motor means to cause said backrest portion to pivot with a proportionately greater rate of angular displacement than said legrest portion.
2 more elements
Dependencies are inferred from the claim text.