Electric lamp having a pressure molded base
First Claim
1. An electric lamp comprising a light transmissive envelope having an end portion terminating at an envelope end a light source disposed within said envelope energizable for emitting light, and a lamp base secured to said envelope end portion, the improvement comprising:
- a mold-sealing member circumferentially disposed on said envelope end portion and having a peripheral surface effective for sealing with the corresponding edge of a pressure mold; and
a portion of said lamp base consisting of synthetic material and pressure molded onto said lamp envelope end portion and said mold-sealing member.
1 Assignment
0 Petitions
Accused Products
Abstract
An electric lamp having a light transmissive envelope enclosing a light source, a circumferential mold-sealing member disposed on an end portion of said envelope, and a lamp base of synthetic material pressure molded onto the mold-sealing member and the envelope end portion. The mold-sealing member provides an effective seal with the corresponding edge of a base mold, allowing the base to be molded directly onto the lamp envelope. For envelopes sealed by a pinch or wedge press, the mold-sealing member is a circumferential ring and for stem-sealed lamps the mold-sealing member is a sealing cap which closes the stem cavity.
36 Citations
22 Claims
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1. An electric lamp comprising a light transmissive envelope having an end portion terminating at an envelope end a light source disposed within said envelope energizable for emitting light, and a lamp base secured to said envelope end portion, the improvement comprising:
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a mold-sealing member circumferentially disposed on said envelope end portion and having a peripheral surface effective for sealing with the corresponding edge of a pressure mold; and a portion of said lamp base consisting of synthetic material and pressure molded onto said lamp envelope end portion and said mold-sealing member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electric lamp comprising a light transmissive envelope having a reentrant stem sealing an end of said envelope in a gas-tight manner, said stem defining a cavity between said stem and said envelope end, a light source disposed within said envelope energizable for emitting light, a lamp base secured on said envelope end opposite said reentrant stem and having a conductive contact, and a conductive lead extending from said light source through said stem to said contact, the improvement comprising:
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a mold-sealing cap disposed on said envelope end closing said cavity and having a circumferential mold-sealing portion extending on the envelope adjacent said end and effective for sealing with the corresponding edge of a pressure mold, said sealing cap having an aperture through which said conductive lead extends in a sealed manner; and a lamp base portion of synthetic material pressure molded onto said sealing cap, said mold sealing cap closing said cavity and said conductive lead being sealed in said aperture for preventing flow of synthetic material into said reentrant stem during pressure molding, said base portion biasing said sealing cap against said envelope and fixing said sealing cap and said base portion to said envelope. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An electric lamp, comprising:
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a) a light transmissive envelope having a sealed end portion terminating at an envelope end; b) a light source disposed within said envelope and energizable for emitting light; c) a circumferential body of synthetic material circumferentially disposed on said envelope end portion and having an outer peripheral surface; and d) a lamp base fixed on said envelope end portion and comprises of one of a thermo-plastic and thermo-setting plastic base material, said base material circumferentially engaging said outer peripheral surface of said circumferential body and extending axially towards said envelope end, said base material having residual stresses biasing said base against said circumferential body and said circumferential body against said envelope end portion for clamping said base and circumferential body to said end portion. - View Dependent Claims (21, 22)
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Specification