# US 5,703,428 A · Electric mains voltage lamp > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,703,428 A - Document ID: US5703428A - Status: Granted - Kind: A - Application number: 08/574,828 - Filed: 1995-12-19 - Granted: 1997-12-30 - Earliest claimed: 1994-12-20 - Assignees: U.S. Philips Corporation - Inventors: Livio Borgis - Web page: https://patentgrep.com/patent/US5703428A ## CPC - F21V 19/00: Fastening of light sources or lamp holders (fastening electric light source solely by the coupling device H01R33/00 {; special means for attaching candle to candle holder F21V35/003}) - F21V 19/0005: {of sources having contact pins, wires or blades, e.g. pinch sealed lamp (F21V19/001 takes precedence)} - F21V 19/006: {of point-like light sources, e.g. incandescent or halogen lamps, with screw-threaded or bayonet base (of sources having contact pins, wires or blades F21V19/0005; of LEDs or sources mounted on printed-circuit board F21V19/001)} - F21V 27/02: Cable inlets - F21V 31/00: Gas-tight or water-tight arrangements - H01J 5/54: supported by a separate part, e.g. base - H01J 61/30: Vessels; Containers - H01J 61/34: Double-wall vessels or containers - H01J 61/35: provided with coatings on the walls thereof; Selection of materials for the coatings (using coloured coatings H01J61/40; using luminescent coatings H01J61/42) - H01J 61/40: by light filters; by coloured coatings in or on the envelope - H01R 33/965: Dustproof, splashproof, drip-proof, waterproof, or flameproof holders - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H) - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS ## Abstract The electric mains voltage lamp has a lamp cap with a cylindrical portion abutting a glass envelope. A resilient cover member circumferentially clamps around and covers the cylindrical portion of the lamp cap and has a circumferential, outwardly extending, flexible collar. The cover member may also cover a cylindrical portion of the envelope which is adjacent the lamp cap. If the envelope is tubular in shape, the cover member may be a sleeve closed at an end thereof which is remote from the lamp cap, so as to cover the whole of the envelope. If the lamp has a bulbous envelope, the lamp may have a resilient domeshaped member covering a portion of the envelope opposite the lamp cap and having an overlap with the cover member. The lamp is able to provide a gastight connection to a lampholder. ## Claims ### Claim 1 An electric mains voltage lamp comprising: a sealed glass envelope having an axis; a lamp cap fixed to the envelope and surrounding the axis thereof, said lamp cap having contacts and a substantially cylindrical portion abutting the envelope; an electric element inside the envelope, from which current conductors extend to the contacts of the lamp cap; a resilient cover member circumferentially clamping around and covering at least a portion of the lamp, characterized in that: the cover member clamps around and covers the cylindrical portion of the lamp cap, leaving bare the contacts thereof, and has a first circumferential, outwardly extending flexible collar. ### Claim 2 (depends on 1) An electric lamp as claimed in claim 1, characterized in that the cover member circumferentially clamps around and covers a substantially cylindrical portion of the envelope which is adjacent the lamp cap. ### Claim 3 (depends on 2) An electric lamp as claimed in claim 2, characterized in that the envelope is substantially tubular in shape and the cover member is a sleeve closed at an end thereof which is remote from the lamp cap, so as to cover the whole of the envelope. ### Claim 4 (depends on 2) An electric lamp as claimed in claim 2, characterized in that the envelope has a bulbous shape and a largest diameter D transverse to the axis in an area remote from the lamp cap, a resilient dome shaped member covering a portion of the envelope opposite the lamp cap including the area of the largest diameter and having an overlap with the cover member. ### Claim 5 (depends on 4) An electric lamp as claimed in claim 4, characterized in that the dome shaped member and the cover member have a circumferential interlocking structure in the overlap. ### Claim 6 (depends on 5) An electric lamp as claimed in claim 5, characterized in that the interlocking structure comprises a ridge cooperating with a groove. ### Claim 7 (depends on 4) An electric lamp as claimed in claim 4, characterized in that the envelope has a light-reflecting coating in an area between the largest diameter D and the lamp cap. ### Claim 8 (depends on 7) An electric lamp as claimed in claim 7, characterized in that the dome shaped member is light-diffusing. ### Claim 9 (depends on 8) An electric lamp as claimed in claim 8, characterized in that the dome shaped member contains a colouring agent. ### Claim 10 (depends on 4) An electric lamp as claimed in claim 4, characterized in that the contacts of the lamp cap are members axially extending away from the lamp cap. ### Claim 11 (depends on 4) An electric lamp as claimed in claim 4, characterized in that the cover member has a second circumferential flexible collar axially spaced apart from the first collar. ### Claim 12 (depends on 3) An electric lamp as claimed in claim 3, characterized in that the cover member has an internally narrowed end portion which rests against a surface portion of the lamp cap facing away from the envelope. ### Claim 13 (depends on 7) An electric lamp as claimed in claim 7, characterized in that the dome shaped member contains a coloring agent. ### Claim 14 (depends on 2) An electric lamp as claimed in claim 2, characterized in that the cover member has an internally narrowed end portion which rests against a surface portion of the lamp cap facing away from the envelope. ### Claim 15 (depends on 1) An electric lamp as claimed in claim 1, characterized in that the contacts of the lamp cap are members axially extending away from the lamp cap. ### Claim 16 (depends on 1) An electric lamp as claimed in claim 1, characterized in that the cover member has a second circumferential flexible collar axially spaced apart from the first collar. ### Claim 17 (depends on 1) An electric lamp as claimed in claim 1, characterized in that the cover member has an internally narrowed end portion which rests against a surface portion of the lamp cap facing away from the envelope.