Compact single-ended incandescent lamp having improved filament mount assembly

Claim 1

A single-ended electric incandescent lamp comprising, in combination; an elongated tubular envelope of vitreous light-transmitting material that has a press seal at one end, a pair of spaced rigid lead-in conductors of unequal length hermetically embedded in said press seal and extending into said envelope, the inner end of the shorter conductor terminating at the presssealed end of the envelope and the longer conductor being offset toward and extending longitudinally along a side wall of the envelope and terminating in a transversely-disposed loop portion the free end whereof depends laterally toward the axis of said envelope, and a coiled-coil filament of refractory metal wire and substantially linear configuration having a singly-coiled leg at each end that extends directly from the filament barrel and encloses and is electrically fastened to the free end of one of the respective lead-in conductors so that said filament is thereby suspended by said conductors in a longitudinallyextending position within said envelope, the maximum width dimension of the traverse loop portion of said longer lead-in conductor relative to the minimum inner dimension of said tubular envelope which encloses said loop portion being such that said loop portion is in loose nesting relationship with the surrounding walls of said envelope and said longer conductor thereby serves both as a current-carrying support member for said filament and as a guide-and-bracing means for the filament mount structure.