Wedge base light bulb

Claim 2

A wedge base light bulb formed from only two pieces of cylindrical glass tubing, comprising: an exhaust tube formed of one piece of glass tubing having a flange at one end including a plurality of axial slots therein; filament support legs axially positioned along the exhaust tube and projecting therebeyond, said support legs being retained at said slots by melting the adjacent material therearound; filament means connected between the upper ends of said support legs; an outer glass enclosure formed of said other piece of glass tubing including a closed upper end encircling said filament means, said support legs and said flange of said exhaust tube, and a lower base fusion sealed about the lower portions of the support legs and the exhaust tube; a plurality of ribs formed on the outer surface of the base adapted to be frictionally received in a wedge base bulb socket, the lower ends of the support legs being formed along the base of the ribs for making electrical contact with the socket terminals; and a pinch seal at the lower end of said exhaust tube for maintaining an evacuated environment in the interior of the bulb as evacuated through said central passage.

Claim 3

A wedge base light bulb formed from only two pieces of cylindrical glass tubing, comprising: an exhaust tube formed of one piece of said glass tubing, said exhaust tube having a central passage therein terminating at one end in a radially flared flange having a plurality of axial slots therein; filament support legs retained at said slots by melting the adjacent material therearound, the upper ends of the support legs extending above said flange and the lower portions of the support legs extending along the exterior surface of the exhaust tube, the free ends of the support legs extending below the lower end of the exhaust tube; filament means connected between the upper ends of said support legs; an outer glass enclosure formed of said other piece of glass tubing including a closed upper end encircling said filament means, said support legs and said flange of said exhaust tube, and a lower base fusion sealed about the lower portions of the support legs and the exhaust tube; a plurality of axial ribs formed on the outer surface of the base adapted to be frictionally received in a wedge base bulb socket, one of said ribs being larger than the others provide circumferential indexing of the bulb; arcuate locking tabs formed between said ribs of said base, said locking tabs adapted to be frictionally engaged by the socket for axially positioning the bulb, the free ends of the support legs being formed along the base of the ribs and upwardly along the outer radial surfaces of the ribs toward said closed upper end, said free ends making electrical contact with the socket terminals; and a pinch seal at the lower end of said exhaust tube for maintaining an evacuated environment in the interior of the bulb as evacuated through said central passage.

Claim 4

A wedge base light bulb formed from only two pieces of cylindrical glass tubing, comprising: an exhaust tube formed of one piece of said glass tubing, said exhaust tube having a central passage therein terminating at one end in a radially flared flange having a plurality of axial slots therein; filament support legs retained at said slots by melting the adjacent material therearound, the upper ends of the support legs extending above said flange and the lower portions of the support legs extending along the exterior surface of the exhaust tube, the free ends of the support legs extending below the lower end of the exhaust tube; filament means connected between the upper ends of said support legs; an outer glass enclosure formed of said other piece of glass tubing including a closed upper end encircling said filament means, said support legs and said flange of said exhaust tube, and a lower base fusion sealed about the lower portions of the support legs and the exhaust tube; a plurality of axial ribs formed on the outer surface of the base adapted to be frictionally received in a wedge base bulb socket, one of said ribs being larger than the others provide circumferential indexing of the bulb; arcuate locking tabs formed between said ribs of said base, said locking tabs adapted to be frictionally engaged by the socket for axially positioning the bulb, the free ends of the support legs being formed along the base of the ribs and upwardly along the outer radial surfaces of the ribs toward said closed upper end, said free ends making electrical contact with the socket terminals; and a pinch seal at the lower end of said exhaust tube for maintaining an evacuated environment in the interior of the bulb as evacuated through said central passage.