Limit switch for D-C positioning motor

Details Limit switch for D-C positioning motor Limit switch for D-C positioning motor

1978-12-27

1980-09-16

Smith, Jr., David

Electricity: motive power systems

Motor-reversing

Periodic- or intermittent-reversing

307146, 318293, 318468, H02P 310

Patent

active

042232562

ABSTRACT:
The limit switch includes a diode which is connected through a spring-operated switch in circuit with a d-c motor such that, when the motor is commanded to operate in one direction and its limit is reached, the diode is placed in blocking direction in the circuit but, upon reversal of polarity of supply to the motor to reverse its direction, the diode becomes conductive so that a closed circuit is immediately established therefor, the conductive direction of the diode being maintained until a reverse limit is reached, at which time the then conductive diode will be connected in blocked direction. During operation in the normal operating zone of the motor, the diode is short-circuited. The switches themselves can readily be constructed to be cam-operated, for example from a rotating shaft which, selectively, connects the diode in a double-pole, double-throw, center-ON circuit arrangement.

REFERENCES:
patent: 2397557 (1946-04-01), McCoy
patent: 2606312 (1952-08-01), Rogers
patent: 2755423 (1956-07-01), Hager
patent: 2912632 (1959-11-01), Turtil
patent: 3173031 (1965-03-01), Slater
patent: 3290575 (1966-12-01), Modiano
patent: 3378699 (1968-04-01), Bruinsma

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