Motion sensor

Details Motion sensor Motion sensor

1989-10-16

1991-07-23

Scott, J. R.

Electricity: circuit makers and breakers

Special application

Change of inclination or of rate of motion responsive

200 6152, H01H 3514

Patent

active

050345796

ABSTRACT:
A motion sensor has a ball of electrically conductive material in an annular ball race around which the ball can travel in response to motion of the sensor and electrical contacts spaced apart from one another around the ball race for electrical contact with the ball during such travel. A circuit responsive to electrical contact of the ball with the contacts detects the travel of the ball and, thus, motion of the sensor and a device is provided for selectively retaining the ball in an inoperative position spaced from the contacts, whereby wear of the contacts by the ball is avoided while the sensor is in a correspondingly inoperative condition.

REFERENCES:
patent: 3163856 (1964-12-01), Kirby
patent: 3655928 (1972-04-01), Engel
patent: 3742478 (1973-06-01), Johnson
patent: 4196429 (1980-04-01), Davis

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