Beds – Invalid bed or surgical support – Vertically movable support for whole body of user
Patent
1996-10-29
1998-09-08
Trettel, Michael F.
Beds
Invalid bed or surgical support
Vertically movable support for whole body of user
5616, 74 8915, A61G 7012, F16H 2702
Patent
active
058026398
ABSTRACT:
A variable force clutch for use with a linear actuator power screw assembly including a threaded drive screw with a stop member secured at each end, the screw assembly used in an application apparatus having at least one cable provided with a barreled end for engaging the assembly. The clutch includes a nut configured for engagement in the bore and having a threaded interior surface for engaging the threads of the drive screw, a grooved exterior surface, upper and lower ends each having a stop lug, the nut being vertically movable resulting from axial rotation of the screw. At least one variable force clutch dog has a grooved formation for slidingly engaging the grooves on the nut, and a cable end retainer configured for securely retaining a barreled cable end. Upon a load placed upon the cable, the dog exerts a frictional force upon the nut to be moveable with the nut until the stop lug engages the stop member to stop the linear movement of the nut, the dog is configured to exert a variable clamping force on the nut, the force corresponding to the load on the cable.
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Frolov Andrey E.
Raasch Jason J.
Midwest Air Technologies Inc.
Trettel Michael F.
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