Electric clamp

Details Electric clamp Electric clamp

2005-04-26

2005-04-26

Wilson, Lee D. (Department: 3723)

Work holders

Relatively movable jaws

Means to actuate jaw

C269S225000, C269S032000

Reexamination Certificate

active

06883795

ABSTRACT:
An electrically powered clamp has a housing, a motor attached to the housing, a ball screw driven by the motor via a belt, and a linkage driven at one end by the ball screw such that the linkage rotates an output shaft attached to the other end of the linkage. The motor and belt drive the ball screw between a fully extended position to rotate the shaft to a clamped position, and a fully retracted position to rotate the shaft to an unclamped position. A built-in computer monitors and controls the clamp. The clamp can also be controlled and monitored by a remote pendant. Indicator lights on the housing and remote pendant convey clamp status information. The clamp is programmable and can memorize the clamped and unclamped positions. The clamp uses velocity and position feedback to determine appropriate drive mode. Torque monitors and timers determine if the clamp becomes stuck.

REFERENCES:
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patent: 4770401 (1988-09-01), Donaldson
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patent: 4854564 (1989-08-01), McPherson et al.
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patent: 5165670 (1992-11-01), Sawdon
patent: 5912541 (1999-06-01), Bigler et al.
patent: 5996984 (1999-12-01), Takahashi
patent: 6220588 (2001-04-01), Tunkers
patent: 6354580 (2002-03-01), Nagai et al.
patent: 6644638 (2003-11-01), McCormick

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