Beds – Invalid bed or surgical support – Vertically movable support for whole body of user
Patent
1992-10-21
1994-09-06
Trettel, Michael F.
Beds
Invalid bed or surgical support
Vertically movable support for whole body of user
5616, 5424, 254103, 254DIG2, A61G 700
Patent
active
053435818
ABSTRACT:
A drive mechanism for a hospital bed effects relative vertical movement of a base and a patient litter. The drive mechanism includes spaced, telescoping threaded screw assemblies, which are driven by a single electric motor through a train of gears having helical teeth oriented to offset inherent frictional forces of the screw assemblies. A support for the motor and a component of the drive train are made of electrically nonconductive materials to electrically isolate the motor, and are arranged to damp vibrations produced by the motor. Two coiled electrical cords extend between the base and patient litter, and are each received in a recess in the patient litter when the patient litter is adjacent the base. A sensor arrangement provides an electrical signal indicative of the relative vertical positions of the patient litter and base, and a manual drive arrangement is provided to permit the gear train to be manually driven.
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Bartley Gary L.
Hopper Christopher J.
Stryker Corporation
Trettel Michael F.
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