Systems and methods for sealing a lighting fixture

• US 8,585,245 B2
• Filed: 04/23/2010
• Issued: 11/19/2013
• Est. Priority Date: 04/23/2009
• Status: Active Grant

• Current Assignee: Integrated Illumination Systems, Inc.
• Original Assignee: Integrated Illumination Systems, Inc.
• Inventors: Black, John, Tracy, Keith
• Primary Examiner(s): Neils, Peggy A.
• Application Number:
  US12/766,807
• Publication Number:
  US 20100271825A1
• Time in Patent Office: 1,306 Days
• Field of Search: 362/267, 362/223, 362/217.01, 362/362, 362/225, 362/217.1
• US Class Current: 362/267
• CPC Class Codes: F21V 31/00 Gas-tight or water-tight arrangements
• CPC Class Codes: F21V 31/005 Sealing arrangements therefor

Abstract

Systems, methods and apparatuses for providing a reliable enclosure and seal for a system or a device, such as a lighting fixture, are disclosed. The solution presented utilizes a silicone gasket combined with an o-ring chord, an acrylic optic and an extrusion to provide a water-tight, air-tight and water-proof enclosure for the lighting fixture. The seal created by the enclosure is maintained regardless of any temperature or environmental changes, as well as any changes in sizes of the components of the enclosure due to the temperature changes. The silicone gasket, in combination with one or more o-rings, end caps and the extrusion adjust for any expansion or contraction of any components of the enclosure due to temperature changes of the lighting fixture or any other enclosed apparatus, system or device.

Claims

1. An apparatus providing a water-proof enclosure of an optic of a lighting fixture, the apparatus comprising:

an enclosure having a plurality of connected rectangular sides;

an optic of a lighting fixture inserted into an extrusion forming the enclosure, the extrusion having a fixed cross-sectional profile and interfacing with one or more o-rings between the optic and walls within the extrusion, the optic expanding when heated and contracting when cooled at a different rate than the extrusion;

a deformable gasket at an end of the extrusion comprising at least one hole for receiving an end of the optic and the one or more o-rings;

an end cap of the enclosure comprising a cavity to receive the deformable gasket;

wherein inserting an end of the optic into the hole of the deformable gasket received by the end cap and securing the end cap to the extrusion provides a water-proof seal around the end of the optic, the deformable gasket and the extrusion; and

wherein the deformable gasket maintains the water-proof seal during expansion and contraction of the optic.

2. The apparatus of claim 1, wherein the deformable gasket comprises a silicone material having a predetermined hardness and flexibility.

3. The apparatus of claim 1, wherein a second deformable gasket at a second end of the extrusion received by a second end cap comprises at least a second hole for receiving a second end of the optic and the one or more o-rings, and

wherein the second deformable gasket at the second of the extrusion secured by the second end cap provides a water-proof seal around the second end of the optic and the one or more o-rings when the second end of the optic is inserted into the second hole.

4. The apparatus of claim 3, wherein the one or more o-rings along with the deformable gasket and the second deformable gasket maintain the waterproof seal between all sides of the optic and the walls the extrusion and the end cap and the second end cap during expansion and contraction of the optic.

5. The apparatus of claim 4, wherein the deformable gasket and the second deformable gasket maintain the water-tight seal between the ends of the optic while the o-rings maintain the water-tight seal between a first side of the optic and a first wall of the extrusion and between a second side of the optic and a second wall of the extrusion during expansion or contraction of the optic, the first wall of the extrusion and the second wall of the extrusion adjacent to the end cap and the second end cap.

6. The apparatus of claim 1, wherein the optic is shaped to bend along a cross-section of the optic and apply pressure against walls of the extrusion via the one or more o-rings during contraction of the optic and during expansion of the optic.

7. The apparatus of claim 1, wherein the optic length from the end of the optic to a second end of the optic is at least four feet long.

8. The apparatus of claim 1, wherein the extrusion along the length of the optic is at least four feet long.

19. The apparatus of claim 1, wherein the deformable gasket comprises a flexible and deformable material having tensile strength of about 6.5 MPa when press cured for 5 minutes at 166 C.

9. An enclosure providing a water-tight seal of a lighting fixture, the enclosure comprising:

an extrusion forming an enclosure for a lighting fixture, the extrusion having a fixed cross-sectional profile and comprising an optic;

one or more o-rings having a predetermined size, flexibility and hardness to provide a water tight interface between the optic and the extrusion, the optic exerting pressure between the one or more o-rings and walls within the extrusion;

a deformable gasket having a predetermined thickness to exert pressure against an end of the optic upon connecting an end cap to an end of the extrusion, the end cap comprising a hole for fitting the deformable gasket,

wherein upon heating of the optic by the lighting fixture, the optic expands at a different rate than the extrusion and the end of the optic presses against the deformable gasket to maintain a water-tight seal, the deformable gasket deformable to contract to compensate for the expansion of the optic;

wherein upon cooling of the optic, the optic contracts at a different rate than the extrusion and the deformable gasket maintains the water-tight seal with the end of the optic as the end of the optic contracts, the deformable gasket deformable to expand to compensate for the contraction of the optic.

10. The enclosure of claim 9, wherein the one or more o-rings maintain the water-tight seal between the optic and the walls of the extrusion as the optic expands upon heating and as the optic contracts upon cooling.

11. The enclosure of claim 10, wherein the enclosure further comprises:

a second deformable gasket having a second predetermined thickness to press against a second end of the optic upon and fitting within a hole of a second end cap at a second end of the extrusion,

wherein upon heating of the optic, the second end of the optic presses against the second deformable gasket to maintain a water-tight seal, the second deformable gasket deformable to contract to compensate for the expansion of the optic; and

wherein upon cooling of the optic, the second deformable gasket maintains the water-tight seal with the second end of the optic as the second end of the optic expands to compensate for the contraction of the optic.

12. The enclosure of claim 11, wherein the length of the optic between the first end and the second end is at least four feet long.

13. The apparatus of claim 11, wherein the optic is shaped to bend along a cross-section of the optic and apply pressure between the optic and the walls of the extrusion via the one or more o-rings during the contraction of the optic and during the expansion of the optic.

14. The enclosure of claim 10, wherein the first end cap and the second end cap are applying pressure against the deformable gasket and the second deformable gasket and providing a water-tight seal.

15. An enclosure providing a water-tight seal of a lighting fixture, the enclosure comprising:

an extrusion forming an enclosure for a lighting fixture, the extrusion having a fixed cross-sectional profile and comprising an optic;

one or more o-rings having a predetermined hardness and sized to fit between the optic and the extrusion, the optic constructed to exert pressure between the one or more o-rings and walls within the extrusion;

a deformable gasket to exert pressure against the optic upon fitting within an end cap of the extrusion, the end cap connected to the extrusion,

wherein upon heating of the optic by the lighting fixture, the optic expands at a different rate than the extrusion and presses against the deformable gasket to provide a water-right seal, the deformable gasket contracting to compensate for the expanding optic;

wherein upon cooling of the optic, the optic contracts at a different rate than the extrusion and the deformable gasket maintains the water-tight seal by expanding to compensate for the contracting optic.

16. The enclosure of claim 15, wherein the deformable gasket comprises one of a rubber, silicone, latex or elastic polymer material.

17. The enclosure of claim 16, wherein the deformable gasket comprises the material with an elongation percentage of about 720 when press cured at 5 minutes at 166 Celsius.

18. The enclosure of claim 17, wherein the deformable gasket comprises the material having tear strength of about 15 kN/m when press cured for about 5 minutes at 166 Celisus.

20. A lighting fixture providing a water-tight seal to optical components, the lighting fixture comprising:

an acrylic optic positioned along a length of an opening of an extrusion forming an enclosure, the extrusion having a fixed cross-sectional profile;

an o-ring positioned between the acrylic optic and walls within the extrusion, the o-ring providing a pressure and a seal between the acrylic optic and the walls within the extrusion;

an end cap enclosing a deformable gasket interfacing with an end of the acrylic optic extruding from the extrusion;

wherein deformation by the deformable gasket and the o-ring fills in gaps created by movement of the acrylic optic responsive to heating or cooling from the lighting fixture, the deformable gasket and the o-ring contracting and expanding to maintain a water-tight seal with the acrylic optic,

wherein the acrylic optic expands or contracts at a different rate than the extrusion.