Pushbutton switch with adjustable pretravel

Details Pushbutton switch with adjustable pretravel Pushbutton switch with adjustable pretravel

1993-04-28

1994-10-25

Luebke, Renee S.

Electricity: circuit makers and breakers

Electric switch details

Contact

200534, H01H 134

Patent

active

053591631

ABSTRACT:
A contact carrying portion of a plunger assembly is adjusted linearly in the direction of switch operating movement by a rotatable cam in the plunger assembly to change an initial gap dimension between stationary and movable contacts. The cam is rotatable about an axis parallel to the direction of switch operating movement and comprises a plurality of angularly spaced diametrically oriented grooves, each of a different depth, in an end surface cooperating with a diametrically disposed rib on the contact carrying portion to vary the axial length of the plunger assembly and provide a detent for the cam adjustment. A housing is provided with a window through a lateral wall for accessing slots in the cam to rotate the cam. The pushbutton switch is resiliently disposed in a supplementary housing to accommodate significant overtravel of a switch operating element.

REFERENCES:
patent: 1853964 (1932-04-01), Dorgeloh et al.
patent: 2946871 (1960-07-01), De Smidt et al.
patent: 3581025 (1971-05-01), Yeo
patent: 3912894 (1975-10-01), Mullen et al.
patent: 5063276 (1991-11-01), Woodard

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