Lighting system with easily replaceable bulbs and retrofitting cover

• US 5,045,981 A
• Filed: 02/09/1990
• Issued: 09/03/1991
• Est. Priority Date: 02/09/1990
• Status: Expired due to Term

• Current Assignee: Tivoli LLC (Tsinghua Tongfang Co., Ltd.)
• Original Assignee: Tivoli Industries, Inc. (3F Filippi SpA)
• Inventors: Nagano, Thomas T.
• Primary Examiner(s): Price, Carl D.
• Assistant Examiner(s): Hagarman, Sue
• Application Number:
  US07/477,615
• Time in Patent Office: 571 Days
• Field of Search: 362/217, 362/219, 362/226, 362/249, 362/221, 362/223, 362/225, 362/238, 362/240, 362/145, 362/146, 362/152, 362/153, 362/147, 439/117, 439/237, 439/436, 439/437, 439/438, 439/439
• US Class Current: 362/219
• CPC Class Codes: F21S 4/20 with light sources held by or within elongate supports
• CPC Class Codes: F21V 19/0005 of sources having contact pins, wires or blades, e.g. pinch sealed lamp F21V19/001 takes precedence
• CPC Class Codes: F21V 21/002 making direct electrical contact, e.g. by piercing F21V21/35 takes precedence
• CPC Class Codes: H01R 4/2406 having needles or pins
• CPC Class Codes: H01R 4/2412 actuated by insulated cams or wedges

Abstract

A low-voltage light fixture to facilitate the insertion and removal of light bulbs, where the light bulb is inserted in a socket which is releasable secured to a carriage. The electrical contact to a pair of leads on the light bulb is made by a pair of acruate terminals fastened within the carriage. The terminals have one free end so that they may bend freely upon insertion of the socket within the carriage. The socket includes a depression configured to conform to the shape of the arcuate terminals, so that the terminals snap into the depression when the socket is inserted into the carriage. The leads extend acros the depression to improve the electrical contact. The socket is further secured to the carriage by a pair of grooves which mate to the carriage'"'"'s guiding rails. The invention further comprises a retrofitting cover and spring-clip mechanism for holding such cover to the housing of the string-lighting system. The spring clip has a pair of protruding brackets and a plurality of barbs which frictionally anchor the spring clip and the retrofitting cover within the channel of the housing.

Claims

1. A low-voltage light fixture configured to facilitate the replacement of expired light bulbs and to improve the conductive contact with the light bulb in the light fixture despite the repeated replacement of expired bulbs, said fixture comprising:

the light bulb, which has a pair of conductive leads, each lead having an end;

a socket having an underside, a pair of sides, and a top side, said socket holding said light bulb so that a portion of said conductive leads is exposed on the underside of said socket, said socket further including a pair of bilateral channels on the sides of said socket, a receptacle which retains the ends of said leads, at least one lead retainer plug which is inserted into said receptacle to secure the ends of said leads within said receptacle, and a depression formed on the underside, of said socket so that said conductive leads extend across said depression;

a carriage, including two walls separated by a perpendicular cross-piece, said cross-piece forming an upper and lower slot in said carriage and having an aperture therethrough, said walls having a pair of bilateral guiding rails in said upper slot, said guiding rails formed to engage with said channels on said socket;

a pair of conductive wires having an insulated coating thereabout;

a base within said lower slot, said base having an upper crossbeam, a lower crossbeam and a center wall so that a pair of lateral slots is formed on each side of said center wall for the insertion of said conducting wires, and said upper crossbeam having two grooves therein;

a pair of conducting terminals separated by said center wall, each of said conducting terminals including a penetrating portion which penetrates the coating of said conductive wire so that said conductive terminal is in electrical contact with said conductive wire, an arcuate portion protruding through said aperture in said perpendicular cross-piece and engaged in said depression so that it is in electrical contact with one of said conductive leads, and exerts a force against said depression to maintain said socket on said carriage, and an end portion which rests freely in one of said pair of grooves so that said conducting terminal is allowed to bend freely when said socket slides onto said carriage; and

a plug to hold said terminals in said base.

2. A low-voltage light fixture configured to facilitate insertion and removal of light bulbs and to provide a secure connection of the light bulb within said fixture, said fixture comprising:

the light bulb, which has a pair of conductive leads;

a socket to hold said light bulb in position so that a portion of said conductive leads is exposed, said socket including a plurality of channels on its exterior;

a carriage including two walls separated by a perpendicular crosspiece, said crosspiece forming an upper slot and a lower slot in said carriage and having an aperture for said exposed leads, said walls having a plurality of guiding rails in said upper slot, to engage with said channels;

conducting wires;

a base within said lower slot, said base having lateral slots for the insertion of said conducting wires; and

conducting terminals, each of said conducting terminals including a contacting portion which is in electrical contact with said conducting wires, and an arcuate portion which is in electrical contact with each of said exposed leads.

3. The apparatus of claim 2 wherein said conducting terminals further include an end which rests freely to allow said terminals to flex freely.

4. The apparatus of claim 2 wherein a depression is formed on said socket so that said leads extend over said depression and said arcuate portion of said conducting terminals is proximate to said depression on said socket.

5. The apparatus of claim 4 wherein said arcuate portion of said terminals exerts a force against said leads so that tension is produced in said leads.

6. The apparatus of claim 2 wherein said socket includes a plurality of receptacles which retain said leads, said socket further including a plurality of lead retainer plugs which rest into said receptacle to secure said leads within said receptacle.

7. The apparatus of claim 2 wherein each of said contacting portions of said conducting terminals is pointed so that they penetrate into said conducting wires.

8. The apparatus claim 2 wherein said base includes a gap, and a plug which fits into said gap to hold said conducting terminals in said base.

9. A low-voltage light fixture for use with a decorative lighting system, said fixture configured to facilitate the insertion and removal of light bulbs, and to reduce the likelihood of accidental electrical short circuit, said light fixture comprising:

the light bulb, which has a pair of conductive leads, each lead having an end;

conducting wires;

a socket having an underside, sides, and a topside, said socket holding said light bulb so that a portion of said conductive leads is exposed near said underside, said socket including a plurality of receptacle chambers which retain the ends of said leads, said socket further including lead retainer plugs which are inserted into said receptacle so that the ends of said leads are fastened within said receptacles;

a carriage to hold said socket;

a base within said carriage to separate said conducting wires; and

a plurality of conducting terminals separated by said base, each of said conducting terminals including a contacting portion which is in electrical contact with said conducting wires, and an arcuate portion which is in electrical contact with one of said conductive leads.

10. The apparatus of claim 9 wherein said socket includes a pair of bilateral channels on the sides of said socket, and said carriage includes a pair of bilateral guiding rails to engage with said channels on said socket.

11. The apparatus of claim 9 wherein said conducting terminals include ends which rest freely within a groove formed in said base.

12. The apparatus of claim 9 wherein a depression is formed on the underside of said socket so that said leads extend over said depression and said arcuate portion of said conducting terminals is proximate to said depression to hold said socket in said carriage.

13. The apparatus of claim 9 wherein each of said contacting portions of said conducting terminals is pointed so that they penetrate into said conducting wires.

14. The apparatus of claim 9 wherein said base includes a gap, and a plug which fits into said gap to hold said conducting terminals in said base.

23. The apparatus of claim 10 wherein each of said contacting portions of said conducting terminals is pointed so that they penetrate into said conducting wires.

15. A low-voltage light fixture for use with a decorative lighting system, said fixture configured to facilitate the insertion and removal of light bulbs, said fixture further configured to improve the conductive contact with said bulb in said fixture despite repeated replacement of said bulbs, said fixture comprising:

the light bulb, which has a pair of conductive leads;

a socket having an underside, a pair of sides, and a topside, said socket holding said light bulb so that a portion of said conductive leads is exposed on the underside of said socket, said socket including a depression formed on the underside of said socket so that said conducting leads extend over said depression;

a carriage including two walls separated by a cross-piece, said cross-piece forming an upper slot and a lower slot in said carriage and having an aperture therethrough;

a pair of conducting wires;

a base within said lower slot, said base having a pair of lateral slots for the insertion of said conducting wires; and

a pair of conducting terminals, each of said conducting terminals including a contacting portion which is in electrical contact with said conducting wires, an arcuate portion which protrudes through said aperture in said cross-piece and is in electrical contact with one of said conductive leads, said arcuate portion being proximate to said depression on the underside of said socket, said arcuate portion exerting a force against said depression to hold said socket on said carriage and contact said leads in said depression.

16. The apparatus of claim 15 wherein said depression on the surface of said carriage is triangular in shape.

17. The apparatus of claim 15 wherein each of said conducting terminals has an end which rests freely within a groove formed in said base.

18. The apparatus of claim 15 wherein each of said contacting portions of said conducting terminals is pointed so that they penetrate into said conducting wires.

19. The apparatus of claim 15 wherein said base includes a gap, and a plug which fits into said gap to hold said conducting terminals in said base.

20. A low-voltage light fixture for use with a decorative lighting system, said fixture configured so as to facilitate the insertion and removal of light bulbs, said fixture further configured to reduce deformation of conductive terminals within said fixture, said fixture comprising:

the light bulb, which has a pair of conductive leads;

a socket having an underside, a pair of sides, and a topside, said socket holding said light bulb so that a portion of said conductive leads is exposed;

conducting wires;

a base having a pair of lateral slots for the insertion of said conducting wires, and a pair of grooves; and

a pair of conducting terminals, each of said conducting terminals including a contacting portion which is in electrical contact with said conducting wires, an arcuate portion which is in electrical contact with one of said conductive leads, and an end portion which rests freely in one of said pair of grooves so that said each of said conducting terminals is allowed to bend freely.

21. The apparatus of claim 20 wherein said pair of grooves in said upper crossbeam are sawtoothed shaped.

22. The apparatus of claim 20 wherein a depression is formed on the underside of said socket so that said leads extend over said depression and said arcuate portion of said conducting terminals is proximate to said depression on the underside of said socket, said depression exerting a force against said arcuate portion so that said arcuate portion exerts a reactive force against said conductive leads.

24. The apparatus of claim 20 wherein said base includes a gap, and a plug which fits into said gap to hold said conducting terminals in said base.