US Patent 7420136 Compression ring button assembly

A button assembly for selectively actuating a switch. The button assembly (10) includes a button member (16) for being mounted in an opening of a housing. The button member (16) is fabricated of a resilient material and defines an outer surface (38) that can be depressed to bring the button assembly (10) into contact with the switch for purposes of actuating the switch. The button assembly (10) also includes a compression ring (26) for being received in a bore (28) provided in the button member (16) whereby the compression ring (26) compresses the button member against the edges of the housing that define the opening in the housing creating a substantially liquid impervious seal and holding the button assembly (10) in place in the opening.