LED work light

• US 20090147519A1
• Filed: 11/04/2008
• Published: 06/11/2009
• Est. Priority Date: 03/18/2004
• Status: Active Grant

• Current Assignee: Alltemp Products Company Limited (DiversiTech Holdings, Inc.)
• Original Assignee: Brasscorp Limited
• Inventors: Klipstein, Donald L., Brass, Jack, Whitfield, Robert Tod
• Granted Patent: US 8,562,184 B2
• Time in Patent Office: Days
• US Class Current: 362/249.20
• CPC Class Codes: F21L 14/023 having two or more, or different light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED work light has multichip LEDs and a diffusing dome. Each LED may have separate electrical terminals for each chip. The LED work light may have convex lenses forward of each LED. Convex lenses may be hemispherical. Convex lenses may have a nonhemispheric curved surface whose cross section has at least one circular arc and no non-circular arcs. The LED work light has a battery or receives power from an external power source. The LED work light may have a transparent plastic tube as a structural member. A replaceable plastic cover may be added to protect any structural tube or other major transparent part of the LED work light from abrasions. The plastic cover may be tubular. The plastic cover may comprise laminations of plastic that can be removed individually after being abraded. Any external power source may be a wall transformer type and may have current limiting means. The LEDs may be attached to the rear surface of an LED PCB that is fastened to a heatsink in a manner achieving thermal contact between the rear surfaces of the LEDs and the heatsink. A position sensing switch may be used.

Claims

1. An LED work light comprising a handle section and a head section and a structural tube extending through the head section and the handle section, and at least one LED mounted in the tube within the head section, and power receiving means for the at least one LED to receive electrical power, an LED board in the tube within the head section and the at least one LED is attached to the LED board, and a heatsink in the tube within the head section, wherein the LED board is fastened to the heatsink in a manner that achieves thermal contact between the at least one LED and the heatsink and wherein the structural tube is transparent in the head section for light from the at least one LED to emit from the work light.

2. The LED work light of claim 1, wherein the LED work light produces a beam that is at least about 40 degrees wide and about 100 degrees wide or less.

3. The LED work light of claim 1, wherein a convex lens is disposed forward of at least one of the at least one LED to achieve a beam having a width of at least above 40 and about 100 degrees or less.

4. The LED work light of claim 1, further comprising a convex lens associated with at least one of the at least one LEDs to concentrate the light from its associated LED into a beam that is between about 40 to 100 degrees wide.

5. The LED work light of claim 1, wherein at least one of the at least one LED is pressed against the heatsink by the LED board.

14. The LED work light of claim 1 further comprising a structural plate disposed forwards of the heatsink, a hole in the structural plate associated with each LED of the at least one LED, and a lens mounted onto the structural plate in front of and associated with at least one of the at least one LED.

15. The LED work light of claim 14 wherein the heatsink is a metal core printed circuit board.

16. The LED work light of claim 14 wherein the structural plate is a printed circuit board.

17. The LED work light of claim 14 wherein the heatsink, structural plate and at least one LED form a light assembly, and the LED work light further comprising board holding means to rotationally and laterally hold the light assembly to the structural tube.

18. The LED work light of claim 15 further comprising board holding means extending longitudinally along the structural tube to rotationally and laterally hold the heatsink to the structural tube.

19. The LED work light of claim 15 further comprising board holding means extending longitudinally along the structural tube to rotationally and laterally hold the structural plate to the structural tube.

6. An LED work light comprising:

at least one LED and a lens associated with the at least one LED, wherein at least one of the at least one associated lens has a curved surface that is nonhemispheric while a cross section of the nonhemispheric surface of the lens comprises at least one circular arc and all arcs are circular.

7. The LED work light of claim 6, wherein the lens associated with at least one of the at least one LED is a convex lens that concentrates the light from its associated LED into a beam that is between about 40 to 100 degrees wide.

8. The LED work light of claim 6, wherein at least one lens is a concavoconvex lens.

9. The LED work light of claim 8, wherein the convex surface of the at least one lens is hemispheric and the concave surface is non-hemispheric and wherein the concave surface a cross section including the lens axis with at least one circular arc and without non-circular arcs.

10. The LED work light of claim 9, comprising a single piece transparent lens assembly that comprises more than one concavoconvex lens with a hemispheric convex surface and a non-hemispheric concave surface that has a cross section including the lens axis with at least one circular arc and all arcs being circular.

11. An LED work light comprising:

a) a head section,

b) a handle section,

c) at least one LED within the head section, and

d) a transparent shield,

wherein the head section comprises transparent structural material that allows light from the at least one LED to emit from the head section, and wherein the transparent shield is suitable for protecting said transparent structural material from scratches and abrasions, and wherein the transparent shield is removable and replaceable.

12. The LED work light of claim 34 where the transparent shield is in the form of a tube that surrounds the head section of the LED work light.

13. The LED work light of claim 34 where the transparent shield is in the form of a circular tube.