Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1995-12-14
1997-10-07
Bonck, Rodney H.
Machine element or mechanism
Gearing
Directly cooperating gears
74 8915, 192141, F16H 2520
Patent
active
056735936
ABSTRACT:
A simple, inexpensive and reliable screw type linear actuator includes a drive screw, a nut disposed thereon, and a reciprocating drive tube radially disposed over at least a portion of the drive screw. A first clutch member has a first clutch surface bearing upon a complimentary clutch surface which is operatively connected to the drive tube, whereby outboard movement of the nut upon rotation of the drive screw causes the first clutch surface on the first clutch member to bear upon the complimentary clutch surface and urge the drive tube in a direction toward the outboard end of the drive screw. A compression member urges the first clutch member axially away from the nut, and a retainer allows only limited axial movement of the nut with respect to the drive screw, whereby the nut and the first clutch member are always maintained in splined engagement. The resulting arrangement provides an overunning nut which relies on a clutch mechanism, and a compression member which exerts a separating force between the clutch mechanism and the nut to ensure that the amount of torque needed to cause the nut to overrun always exceeds the frictional torque between the drive screw and the nut, irrespective of the axial load or force which is applied to the linear actuator.
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Bonck Rodney H.
Joerns Healthcare Inc.
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