Miniature electrical push button contactor

Claim 1

An electrical push button contactor comprising: (a) a base having an inner axial recess; (b) a button telescopically mounted on said base and formed with an axially inwardly projecting guide post which is stepped down in diameter to provide two longitudinally spaced inwardly facing annular shoulders separated by a short intermediate post length portion which terminates in an axial post extension having a sliding fit in said inner recess of said base; (c) spring means surrounding said extension and positioned between said inner recess of said base and the lower shoulder of said post for normally biasing said button away from said base; (d) at least two spaced stationary contact members positioned within said base and having portions extending outwardly therefrom; (e) a movable contact member comprising a flexible, resilient, ring-shaped disc positioned on said intermediate post length for bridging said stationary contact members; the inner diameter of said disc being greater than the diameter of said intermediate post length portion but smaller than the diameter of the upper annular shoulder and also smaller than the outer diameter of said spring means; whereupon further movement of said movable contact member in the same direction as causes said movable member to contact said stationary members tends to flex said movable contact member thereby providing a wiping action between said movable contact member and said stationary contact members; and (f) abutment means for stopping said further movement of said movable contact member when the flexion thereof has attained a predetermined degree at which the movable contact member exerts on each of said stationary contact members a contact pressure at least equal to the requisite minimum contact pressure even where the effective contact areas of said stationary contact members lie at different heights relative to said base.