Collapsible fluorescent light for photography

• US 4,782,428 A
• Filed: 08/21/1987
• Issued: 11/01/1988
• Est. Priority Date: 08/21/1987
• Status: Expired due to Fees

• Current Assignee: Lowel-Light Manufacturing Incorporated
• Original Assignee: Lowel-Light Manufacturing Incorporated
• Inventors: Marks, Dale, Seligman, Marvin, Lowell, Ross, Pronputhsri, Apiruk, Calamai, Edward, Doll, Stephen
• Primary Examiner(s): Scott, Samuel
• Assistant Examiner(s): Flanigan, Allen J.
• Application Number:
  US07/088,049
• Time in Patent Office: 438 Days
• Field of Search: 362/3, 362/11, 362/18, 362/225, 362/319, 362/346, 362/401, 362/429, 248/292.1, 248/364
• US Class Current: 362/11
• CPC Class Codes: F21S 8/00 Lighting devices intended for fixed installation F21S9/00, F21S10/00 take precedence; using a string or strip of light sources F21S4/00
• CPC Class Codes: F21V 17/007 with provision for shipment or storage
• CPC Class Codes: F21V 19/008 of straight tubular light sources, e.g. straight fluorescent tubes, soffit lamps
• CPC Class Codes: F21V 23/026 Fastening of transformers or ballasts
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes

Abstract

A collapsible fluorescent tube fixture comprises a frame having a pair of spaced apart tube end supports each carrying a row of sockets, each socket being for receiving electrodes of one end of a fluorescent tube, and a scissors assembly connected between the supports for permitting the supports to move together into a storage position and to accommodate various length tubes and apart into a use position. Fluorescent tubes can be engaged between the sockets of the two supports with the supports in their use position. A boom has one end connected to the scissors assembly and an opposite end which carries an electrical ballast. The ballast is electrically connected to the sockets and may serve not only to electrically ballast the fluorescent tube but also to mechanically balance the weight of the frame. A pivot clamp connected intermediate the ends of the boom can be used to mount the boom on a tripod or other support structure.

Claims

1. A collapsible fluorescent tube fixture comprising:

a frame having a pair of spaced apart tube ends supports each carrying a row of sockets, each socket being for receiving electrodes of one end of a fluorescent tube, and collapsing means operatively connected between said supports permitting said supports to be moved together into a storage position and apart into a used position, fluorescent tubes being connectable between sockets of said supports when said supports in their use position;

a boom having one end connected to said collapsing means for supporting said frame, and an opposite end;

an electrical ballast mechanically connected to said opposite end of said boom and electrically connected to said sockets for electrically ballasting fluorescent tubes connected to said socket; and

a pivot clamp connected to said boom intermediate its ends for engagement on a support structure to carry the fixture, said collapsing means comprises a collapsible scissors assembly having a central rod and a pair of pivotally connected together scissors members operatively connected between said central rod and each support.

2. A fixture according to claim 1, wherein said electrical ballast physically counter-balances the weight of said frame.

3. A fixture according to claim 1, including a second pivot clamp connected between said one end of said boom and said central rod, and a third pivot clamp connected between said opposite end of said boom and said ballast for pivotally supporting said frame and said ballast on said boom.

4. A fixture according to claim 3, wherein each of said first mentioned, second and third pivot clamps comprise a clamp member having an opening for receiving a post, and a bracket pivotally mounted to said clamp member and connected to one of said boom, central rod and ballast.

5. A fixture according to claim 1, including a flexible reflector operatively connected between said supports.

6. A fixture according to claim 5, including a barn door pivotally connected to each support, said reflector having pair of edge flaps extending between said supports and positioned on opposite edges of said reflector, a bail pivotally mounted to both ends of each support, each bail being operatively connected to an end of one flap for supporting each flap.

7. A fixture according to claim 6, wherein each support includes a row of fluorescent end clips, each clip being aligned with one of said sockets for engaging an end of a fluorescent tube whose electrodes are engaged in said socket, said sockets being spaced apart in said storage position for said supports by a distance equal to a diameter of said reflector when said reflector is rolled up and positioned between said row of clips on said pair of supports.

8. A fixture according to claim 7, wherein said barn doors are positioned and have a width so that with said supports in their storage position, said barn doors can be folded over said rolled up reflector.

9. A fixture according to claim 1, including a flexible reflector operatively connected between said supports for reflecting light from fluorescent tubes connected between sockets of said supports, said supports being movable into a plurality of spaced apart use positions for accommodating fluorescent tubes of different lengths.

10. A collapsible fluorescent tube fixture comprising:

a frame having a pair of spaced apart tube ends supports each carrying a row of sockets, each socket being for receiving electrodes of one end of a fluorescent tube, and collapsing means operatively connected between said supports permitting said supports to be moved together into a storage position and apart into a used position, fluorescent tubes being connectable between sockets of said supports when said supports in their use position;

a boom having one end connected to said collapsing means for supporting said frame, and an opposite end;

an electrical ballast mechanically connected to said opposite end of said boom and electrically connected to said sockets for electrically ballasting fluorescent tubes connected to said socket; and

a pivot clamp connected to said boom intermediate its ends for engagement on a support structure to carry the fixture, said collapsing means comprises a central rod in a plurality of scissor members operatively connected between said central rod and said supports, a second pivot clamp connected between said one end of said boom and said central rod at the center of said central rod, said first mentioned pivot clamp being connected to said boom at a location spaced from said second pivot clamp by slightly more than the distance between said second pivot clamp and an end of said central rod, said boom having a length substantially equal to the length of said ballast, and a third pivot clamp connected between said ballast and said opposite end of said boom.

11. A fixture according to claim 10, wherein said central rod is mounted for rotation to said second pivot clamp, about an axis normal to a plane passing through both of said supports.

12. A collapsible fluorescent tube fixture comprising:

a frame having a pair of spaced apart tube ends supports each carrying a row of sockets, each socket being for receiving electrodes of one end of a fluorescent tube, and collapsing means operatively connected between said supports permitting said supports to be moved together into a storage position and apart into a used position, fluorescent tubes being connectable between sockets of said supports when said supports in their use position;

a boom having one end connected to said collapsing means for supporting said frame, and an opposite end;

an electrical ballast mechanically connected to said opposite end of said boom and electrically connected to said sockets for electrically ballasting fluorescent tubes connected to said socket; and

a pivot clamp connected to said boom intermediate its ends for engagement on a support structure to carry the fixture, each support comprises a bent sheet metal channel having a U-shaped portion with a long leg on which said sockets are mounted and a short leg, and a V-shaped portion connected to said short leg, a barn door pivotally connected to said long leg of said channel, a row of tube clips connected to said V-shaped portion and each aligned with one of said sockets for engaging an end of a tube whose electrodes are engaged in said socket, a connecting plug connected to said channel and electrical wires connected between said sockets and said electrical plug each disposed in said U-shaped portion.

13. A fixture according to claim 12 including a cover plate connected to said V-shaped portion and extending over said U-shaped portion.

14. A fixture according to claim 13 including a fastening tape extending along said V-shaped portion, said fixture including a reflector having a fastening tape at each end, each fastening tape of said reflector being engaged with a fastening tape of one of said V-shaped portions for stretching said reflector between said supports.

15. A fixture according to claim 14, wherein said reflector has edge flaps each extending between said supports with said supports in said use position, a bail pivotally connected to each end of each channel, each flap having ends engaged with bails of said channel.

16. A collapsible fluorescent tube fixture comprising a pair of spaced apart tube end supports each carrying a row of sockets, each socket being for receiving electrodes of one end of a fluorescent tube, a collapsible scissor assembly operatively connected between said supports for permitting movement together and movement apart of said supports with said supports being held parallel in a closed together storage position and in a separated use position, a flexible reflector connected between said supports and an electrical ballast mechanically connected to said scissor assembly and electrically connected to said sockets.

17. A fixture according to claim 16, wherein said scissor assembly comprises a central rod and a pair of scissor members pivotally mounted to each other and pivotally mounted between said central rod and each of said supports.

18. A fixture according to claim 17, including a boom having one end pivotally connected to said central rod and an opposite end pivotally connected to said ballast.

19. A fixture according to claim 16, including additional reflectors each with a different length for holding said supports from moving apart beyond a selected distance, said selected distance being substantially equal to a length of different fluorescent tubes to be engaged between sockets of said pair of supports.

20. A fixture according to claim 16, including a second pair of spaced apart tube end supports and a second collapsible scissor assembly connected between said second pair of supports for permitting movement together and apart of said second pair of supports between a storage position and a use position, and a boom having opposite ends connected respectively to said first mentioned and additional collapsible scissor assemblies.