Speed responsive switching device

Details Speed responsive switching device Speed responsive switching device

1976-05-17

1977-10-18

Scott, James R.

Electricity: circuit makers and breakers

Special application

Change of inclination or of rate of motion responsive

200 6139, 310 68R, H01H 3500

Patent

active

040547647

ABSTRACT:
An overspeed switching mechanism for a motor has an electrically conductive rotor driven by the motor, a movable drag mechanism having a permanent magnet structure linked magnetically with the rotor for movement of the mechanism through electromagnetic interaction between the magnet structure and the rotor, a latching mechanism linked with the drag mechanism by means of another permanent magnet structure for restraining movement of the drag mechanism until the rotor attains a preset speed at which the latching mechanism releases the drag mechanism and allows limited movement thereof, a switch, and an actuator operatively linked with the drag mechanism and the switch for translating movement of the drag mechanism into switching of the switch.

REFERENCES:
patent: 2718567 (1955-09-01), Elliot et al.
patent: 2816187 (1957-12-01), Smith
patent: 3012157 (1961-12-01), Baring et al.
patent: 3021402 (1962-02-01), La Warre et al.
patent: 3025369 (1962-03-01), Wargo
patent: 3527905 (1970-09-01), Doi

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