Motor starting switch

Details Motor starting switch Motor starting switch

1979-10-09

1981-10-20

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318325, 200 80R, H02P 530

Patent

active

042963664

ABSTRACT:
A motor starting switch installable, for example, on a fractional horsepower electric motor and actuable between a run and a start position by means of a centrifugal actuator axially shiftable on the rotor shaft of the motor in response to start up or shut down of the motor. The starting switch includes a rotary actuator member having a cam follower engageable by a conical cam surface on the centrifugal actuator as the latter shifts axially from its run to its start position thereby to effect rotary movement of the actuator member and to effect actuation of the switch from its run to its start position as the centrifugal actuator moves through only a portion of its stroke. The rotary actuator member is further engageable with a cylindrical cam surface of the centrifugal actuator after the switch has been converted to its start position thereby to prevent overstressing of a switch arm within the starting switch upon continued movement of the centrifugal actuator to its start position.

REFERENCES:
patent: 3209093 (1965-09-01), Simpson
patent: 3493707 (1970-02-01), Castle
patent: 3691415 (1972-09-01), Hancock et al.
patent: 3790730 (1974-02-01), Wyland

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