Secondary speed sensor for governed air grinders

Details Secondary speed sensor for governed air grinders Secondary speed sensor for governed air grinders

1978-01-23

1980-01-22

Vrablik, John J.

Rotary expansible chamber devices

Speed controlled

Weight rotates about axially extending axis

137 57, 73538, F01C 2112, G05D 1310

Patent

active

041848195

ABSTRACT:
A speed sensor is attached to the output shaft of the rotary vane air motor. The speed sensor includes a body member which is pivotally mounted at one end on the output shaft for movement about an axis parallel to the shaft axis. The opposite end of the body member is biased into engagement with a locking pin. So long as the shaft of the air motor does not exceed a threshold speed, the body member remains in the described position. Upon exceeding a threshold speed, the body member disengages from the locking pin due to centrifugal force acting thereon and then engages a movable shutter. In this manner, the shutter is moved by the body member to close air flow passages to the air motor.

REFERENCES:
patent: 860124 (1907-07-01), Bliss
patent: 3279485 (1966-10-01), Alexander
patent: 3519372 (1970-07-01), Peale
patent: 3767332 (1973-10-01), Wickham et al.

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