Electric switch having reduced actuator play

Details Electric switch having reduced actuator play Electric switch having reduced actuator play

1989-11-24

1991-01-15

Cusick, Ernest G.

Electricity: circuit makers and breakers

Electric switch details

Actuators

200342, 200344, 200345, 200459, 200408, H01H 312, H01H 348, H01H 1370

Patent

active

049856030

ABSTRACT:
An electric switch design compensates for unprodictable but significant variability, within a known range, in case and cover material shrinkage during manufacture. A contact actuator has radially spaced guide bosses and an axial barrel providing a plurality of external axially extending sharp bearing ridges. Case guide structure cooperates with the actuator guide bosses to permit actuator travel generally normal to the case floor. The actuator is dimensioned with respect to the case guide structure to accommodate the unpredictable case material shrinkage variability and thereby to permit actuator play in which the actuator axis is rotatable out of the normal to the case floor. The switch cover provides an actuator collar having an inner, surface coaxial with the normal to the case floor and dimensioned with respect to the actuator barrel such that for all shrinkage values within the known range, the actuator barrel bearing ridges interfere with the collar inner surface for reduction of actuator play with minimal friction between barrel and actuator collar.

REFERENCES:
patent: 2556981 (1951-06-01), Raney
patent: 3777090 (1977-12-01), Muller
patent: 4132877 (1979-01-01), Daige
patent: 4707578 (1987-11-01), Burkhardt
patent: 4742186 (1988-05-01), Miura

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