Wedge-base lamp and socket assembly

Claim 1

A wedge-base lamp and socket assembly in which a double filament socket excludes the entry of a single filament lamp, comprising: a wedge-base lamp having an envelope containing at least one filament therein, a wedge base coupled to said envelope, and a pair of projections formed on opposite sides of said wedge base near the center of said wedge base; a socket for receiving a wedge base of a wedge-base lamp therein, said socket having a pair of arms which are engageable with said pair of projections of said wedge-base lamp when said wedge base of said wedge-base lamp is mounted within said socket; and wherein said wedge-base lamp is of the single filament wedge-base type and has a fool-proof projection on said base thereof; and wherein said socket is a double filament type wedge-base socket and has an abutment portion therein which is abuttingly engageable with said fool-proof projection of said single filament type wedge-base lamp when said single filament type wedge-base lamp is inserted into said double filament type wedge-base socket, to prevent full entry of said single filament type wedge-base lamp into said double filament type wedge-base socket, thereby preventing erroneous coupling between a single filament type wedge-base lamp and a double filament type wedge-base socket; and wherein said abutment portion of said double filament type wedge-base socket is arranged such that when a double filament type wedge-base lamp is used in place of said single filament type wedge-base lamp, said double filament type wedge-base lamp being free of said fool-proof projection so that full entry of said double filament type wedge-base lamp into said double filament type wedge-base socket is permitted without said abutting engagement.