Snap-in modular keypad apparatus

Abstract

A modular snap-in keypad apparatus includes a planar frame member having a plurality of button accommodating apertures and a plurality of mounting posts extending therefrom. An elastomeric key button assembly has a planar surface containing a plurality of apertures which are positioned to receive each post. The button assembly comprises a plurality of raised elastomeric button structures which extend through an associated button accommodating aperture when said posts of said frame assembly accommodates the apertures in the button assembly. A planar switch assembly has a plurality of apertures which are congruently positioned with respect to the posts to enable the contact assembly to be positioned with respect to each button so that a conductive area of the button contacts the contact assembly when the button is depressed. The contact assembly is fabricated on a Mylar sheet and has a contact area which consists of an outer partial circular contact having inwardly disposed triangular projections and an inner T-shaped contact. When a button is depressed the inner T-shaped contact contacts the outer circular contact by means of the conductive area of the button. A planar back plate is secured to the frame assembly by means of apertures therein. The back plate supports and further enables a user to tactically respond to switch depression.