LED work light

• US 9,297,509 B2
• Filed: 10/11/2011
• Issued: 03/29/2016
• 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., Whitfield, Robert Tod
• Primary Examiner(s): PAYNE, SHARON E
• Application Number:
  US13/270,808
• Publication Number:
  US 20120113636A1
• Time in Patent Office: 1,631 Days
• Field of Search: 362/202, 362/184, 362/208, 362/237, 362/311.01, 362/311.02, 362/311.09, 362/311.1, 362/336, 362/340, 362/451, 359/708, 359/718, 359/719
• US Class Current: 1/1
• CPC Class Codes: F21L 14/023 having two or more, or different light sources
• CPC Class Codes: F21L 4/00 Electric lighting devices with self-contained electric batteries or cells
• CPC Class Codes: F21L 4/08 characterised by means for in situ recharging of the batteries or cells
• CPC Class Codes: F21S 4/20 with light sources held by or within elongate supports
• CPC Class Codes: F21S 45/47 Passive cooling, e.g. using fins, thermal conductive elements or openings
• CPC Class Codes: F21V 15/04 Resilient mountings, e.g. shock absorbers shock absorbing devices of vehicle headlamp housings B60Q1/0491; in general F16F15/04
• CPC Class Codes: F21V 17/12 by screwing
• CPC Class Codes: F21V 21/06 Bases for movable standing lamps; Fixing standards to the bases F21V21/08 takes precedence
• CPC Class Codes: F21V 21/08 Devices for easy attachment to any desired place, e.g. clip, clamp, magnet
• CPC Class Codes: F21V 21/32 Flexible tubes
• CPC Class Codes: F21V 21/406 for portable lighting devices
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 23/0435 activated by remote control means
• CPC Class Codes: F21V 27/005 for portable lighting devices
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2103/10 : comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 : Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 : Controlling the intensity of the light
• CPC Class Codes: H05B 45/375 : using buck topology
• CPC Class Codes: H05B 45/38 : using boost topology
• CPC Class Codes: H05B 45/56 : involving measures to prevent abnormal temperature of the LEDs
• CPC Class Codes: Y02B 20/30 : Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A work light has a head section with a single piece metal channel having a rear portion and opposing side flanges. The rear portion and side flanges extending longitudinally along the channel. Light has a handle section. LEDs are mounted on channel such that the channel is heatsink for the LEDs. A transparent single piece lens assembly covers the LEDs, the lens assembly has a corresponding plurality of convex lenses, each convex lens forward of each LED, the lens assembly attached to the rear portion of the channel. Forward edges of the side flanges of the channel extend farther forward from the rear surface than the lens assembly for protection.

Claims

1. A light emitting diode (LED) work light comprising:

an outer casing including a head section and a handle section,

the head section comprising a single piece metal elongate channel having a rear portion and opposing side flanges perpendicular to the rear portion, the rear portion and side flanges extending longitudinally along the channel, the channel defining an open transverse side between the opposing side flanges,

a plurality of LEDs directly mounted on a surface of the rear portion inside the channel such that the channel is a heatsink for the LEDs, the LEDs generally disposed in a linear fashion along the channel, the LEDs being directional LEDs aimed to emit from the substantially open transverse side, and

a transparent unitary multiple element convex lens covering the LEDs, the single piece multiple lens comprising a plurality of convex lenses including a corresponding convex lens forward of each LED, the single piece multiple lens directly affixed to the rear portion of the channel by at least one fastener that passes through the transparent unitary multiple element convex lens to the rear portion of the channel,

wherein each convex lens further comprises a concavoconvex lens wherein a central part of a rear surface of the concavoconvex lens is flat,

wherein forward edges of the side flanges of the channel extend farther forward from the rear surface than the unitary multiple element convex lens.

2. The work light of claim 1 wherein the at least one fastener further comprises at least one screw through at least one hole in the transparent unitary multiple element convex lens.

3. The work light of claim 1 wherein each convex lens concentrates the light from the corresponding LED into a beam that is 40 to 90degrees wide.

4. The work light of claim 1 wherein the channel extends the full length of the LED work light including the head section and the handle section.

5. The work light of claim 1 wherein the transparent unitary multiple element convex lens further comprises a transition member between the convex lenses which is of unitary construction with the convex lenses.

6. The work light of claim 1 wherein the handle section is of unitary construction with the head section.

7. The work light of claim 1 wherein at least one LED has a nominal power rating of at least 1 watt.

8. The work light of claim 1 wherein at least one LED has a nominal power rating of at least 5 watts.

9. The work light of claim 1 wherein all of the plurality LEDs comprise white LEDs.