Work holders – With fluid means – Cylinder-piston means in series with additional positioning...
Patent
1994-08-17
1996-11-19
Watson, Robert C.
Work holders
With fluid means
Cylinder-piston means in series with additional positioning...
B23Q 308
Patent
active
055754627
ABSTRACT:
A rotary clamp for a linear actuator having means for converting linear actuator motion between a first position and a second position into rotary clamp motion between an unclamped position and a clamped position wherein a reciprocating member provides means, separate from the linear actuator, for resetting the converting linkage toward the first position without having to disassemble the rotary clamp of the linear actuator. The reciprocating member also provides a secondary stop to prevent the converting linkage from reaching an over-center position. The reciprocating member is slidably disposed and captured within a wall of a housing of the rotary clamp. If power is lost to the rotary clamp, the clamp may become "locked" in the clamped position, and the reciprocal member may be struck from the outside of the housing in order to drive the linear actuator toward the unclamped position thus manually resetting the converting means of the clamp. The reciprocal member abuts the inside wall of the housing in its fully retracted position to provide a secondary stop to the linear actuator and prevent the linkage mechanism from reaching an over-center position. A cam means is provided for guiding and supporting the linear actuator against linkage forces directed perpendicular to the linear line of motion, thus eliminating the need for side walls in the housing.
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Reexamination Certificate BI 4,905,973 issued Jul. 5, 1994.
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