Slip clutch linear actuator

Machine element or mechanism – Gearing – Directly cooperating gears

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Details

74 8915, 192141, F16H 5710

Patent

active

054619351

ABSTRACT:
A linear actuator of the present invention includes a hollow drive tube. A slip clutch having front and rear camming surfaces is housed in the tube for rotation about an longitudinal axis. The slip clutch is axially fixed in the tube by a shoe. The slip clutch threadably receives a threaded shaft which is connected to a gear motor to be driven thereby. The shaft has stop nuts at either end, each of which has a camming surface which mates with a respective camming surface of the slip clutch. When the shaft is rotated by the motor, it rotates in the slip clutch. The slip clutch frictionally engages the drive tube, via the shoe, so that the tube will move linearly. When the slip clutch is engaged by one of the stop nuts, the slip clutch will free wheel in the tube and the tube will cease its linear movement. The slip clutch will continue to rotate in the tube till the motor is stopped or its direction is reversed.

REFERENCES:
patent: 3583248 (1971-06-01), Langenberg
patent: 3736802 (1973-06-01), Kibler
patent: 4574654 (1986-03-01), Griffiths
patent: 4588913 (1986-05-01), Adami
patent: 4672858 (1987-06-01), Langowski
patent: 4846011 (1989-07-01), Gaffney
patent: 4858481 (1989-08-01), Abraham
patent: 5063808 (1991-11-01), Hill
patent: 5136889 (1992-08-01), Hill et al.
patent: 5187993 (1993-02-01), Nicholson et al.

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