Light including a heat sink and LEDs coupled to the heat sink

• US 9,851,088 B2
• Filed: 02/04/2016
• Issued: 12/26/2017
• Est. Priority Date: 02/04/2015
• Status: Active Grant

• Current Assignee: Milwaukee Electric Tool Corporation (Techtronic Industries Company Limited)
• Original Assignee: Milwaukee Electric Tool Corporation (Techtronic Industries Company Limited)
• Inventors: Harvey, Kyle, McIntyre, Ross, Proeber, David, Isaacs, Jason, Schermerhorn, Joshua, Cornell, Brian
• Primary Examiner(s): Ly, Toan
• Application Number:
  US15/015,794
• Publication Number:
  US 20160223185A1
• Time in Patent Office: 691 Days
• Field of Search: 362190
• CPC Class Codes: F21L 14/00 Electric lighting devices without a self-contained power source, e.g. for mains connection
• 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 9/02 the power supply being a battery or accumulator
• CPC Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• CPC Class Codes: F21V 23/0435 activated by remote control means
• CPC Class Codes: F21V 23/06 the elements being coupling devices , e.g. connectors
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/78 with helically or spirally arranged fins or blades
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21Y 2101/00 Point-like light sources
• CPC Class Codes: F21Y 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A light includes a housing defining a bottom end and a top end, a heat sink disposed within the housing and including a central body that defines a central aperture, and a plurality of arms coupled to the central body and extending outward from the central body, each of the arms including a light receiving surface. A plurality of LEDs is coupled to each of the light receiving surfaces and a hollow tube extends from the bottom of the housing and is coupled to the heat sink to define a cooling air passage that passes through the hollow tube and the central aperture to direct cooling air from the bottom of the housing to the top of the housing.

Claims

1. A light comprising:

a housing defining a bottom end and a top end;

a heat sink disposed within the housing and including a central body that defines a central aperture;

a plurality of arms coupled to the central body and extending outward from the central body, each of the arms including a light receiving surface;

a plurality of LEDs coupled to each of the light receiving surfaces; and

a first hollow tube section extending from the bottom end of the housing and coupled to the heat sink to define a cooling air passage that passes through the first hollow tube section and the central aperture to direct cooling air from the bottom end of the housing to the top end of the housing; and

a second hollow tube section extending from the top end of the housing and coupled to the heat sink to direct the cooling air out of the housing; and

a cover member coupled to the second hollow tube section to inhibit access to the cooling air passage.

2. The light of claim 1, wherein the housing defines a pair of power tool battery pack receiving slots each arranged to receive a power tool battery pack.

3. The light of claim 2, wherein the housing defines an external power source connection arranged to receive an AC power supply from an external power source.

4. The light of claim 3, further comprising a power control circuit operable to detect the level of charge in each of the power tool battery packs and to deliver power to the LEDs sequentially from the battery packs beginning with the battery pack having the lowest state of charge.

5. The light of claim 1, wherein each of the plurality of arms includes a plurality of fins that each extend from the light receiving surface toward the central aperture.

6. The light of claim 1, wherein the heat sink defines a plurality of external apertures extending parallel to the central axis.

7. The light of claim 1, further comprising a control panel coupled to the housing and operable to display at least two of an intensity of the emitted light, a current power source used to deliver power to the LEDs, a battery charge indication, and a light operating mode indication.

8. The light of claim 1, further comprising a receiver operable to receive signals from a source separate from the light, the signals operable to control the operation of the LEDs.

9. The light of claim 1, wherein the first hollow tube section and the second hollow tube section are integrally formed as a single tube.

10. The light of claim 1, wherein the first hollow tube section and the second hollow tube section are separate tubes.

11. The light of claim 10, wherein the first hollow tube section threadably engages the heat sink, and wherein the second hollow tube section threadably engages the heat sink.

12. The light of claim 1, wherein the cover member is configured to allow the cooling air to flow out of the second hollow tube.

13. A light comprising:

a housing;

a heat sink disposed within the housing;

a plurality of LEDs coupled to the heat sink and operable in response to a supply of power;

a first power supply including two power tool battery packs selectively coupled to the housing;

a second power supply arranged to receive AC power from an external source; and

a power control circuit operable to detect the level of charge in each of the power tool battery packs and to deliver power to the LEDs sequentially from the battery packs beginning with the battery pack having the lowest state of charge, the power control circuit also operable to detect when one battery pack is drained and automatically reduce an intensity of the LEDs in response to the one battery pack being drained.

14. The light of claim 13, wherein the housing defines a pair of power tool battery pack receiving slots each arranged to receive one of the power tool battery packs.

15. The light of claim 13, wherein the heat sink defines a central aperture and includes a plurality of arms that extend outward from the central aperture and define a light receiving surface.

16. The light of claim 15, wherein each of the plurality of arms includes a plurality of fins that each extend from the light receiving surface toward the central aperture.

17. The light of claim 15, wherein the heat sink defines a plurality of external apertures extending parallel to the central axis.

18. The light of claim 13, further comprising a control panel coupled to the housing and operable to display at least two of an intensity of the emitted light, a current power source used to deliver power to the LEDs, a battery charge indication, and a light operating mode indication.

19. The light of claim 13, further comprising a receiver operable to receive signals from a source separate from the light, the signals operable to control the operation of the LEDs.

20. A light comprising:

a housing defining a bottom end and a top end;

a heat sink disposed within the housing and including a central body that defines both a central aperture and a plurality of external apertures, the central aperture extending along a central axis of the light and each of the external apertures extending along external axes that are parallel to and offset from the central axis;

a plurality of arms coupled to the central body and extending outward from the central body, each of the arms including a light receiving surface and a plurality of fins that extend from the light receiving surface toward the central axis;

a plurality of LEDs coupled to each of the light receiving surfaces; and

a cooling air flow path extending from the bottom end of the housing through the heat sink aperture to direct cooling air from the bottom end of the housing to the top end of the housing.

21. The light of claim 20, wherein the housing defines a pair of power tool battery pack receiving slots each arranged to receive a power tool battery pack.

22. The light of claim 21, wherein the housing defines an external power source connection arranged to receive an AC power supply from an external power source.

23. The light of claim 22, further comprising a power control circuit operable to detect the level of charge in each of the power tool battery packs and to deliver power to the LEDs sequentially from the battery packs beginning with the battery pack having the lowest state of charge.

24. The light of claim 20, further comprising a control panel coupled to the housing and operable to display at least two of an intensity of the emitted light, a current power source used to deliver power to the LEDs, a battery charge indication, and a light operating mode indication.

25. The light of claim 20, further comprising a receiver operable to receive signals from a source separate from the light, the signals operable to control the operation of the LEDs.

26. The light of claim 20, further comprising a tube having a first end connected to the heat sink and a second end positioned at the bottom of the housing, the tube arranged to direct cooling air from the second end to the first end to provide cooling air to the central aperture.

27. A light comprising:

a housing having a bottom, a top, and a central axis extending through the bottom and the top, the housing including an upper portion and a lower portion, the lower portion defining a battery port;

a plurality of legs coupled to the lower portion of the housing;

a heat sink extending upward from the lower portion of housing and defining a central aperture extending along the central axis, the heat sink including a plurality of light support surfaces arranged around a perimeter of the heat sink;

a first plurality of LEDs coupled to the plurality of light support surfaces, the first plurality of LEDs arranged to emit light in a 360 degree pattern;

a second plurality of LEDs supported on top of the heat sink, the second plurality of LEDs arranged to emit light upward in a direction substantially parallel to the central axis;

a power input supported on the lower portion of the housing, the power input configured to connect to an external AC power source to power the first and second pluralities of LEDs;

a power outlet supported on the lower portion of the housing, the power outlet configured to connect to another device to power the another device;

a battery pack received in the battery port to power the first and second pluralities of LEDs;

a charging circuit positioned within the housing and electrically coupled to the power input, the charging circuit operable to charge the battery pack; and

a control panel supported on the lower portion of the housing, the control panel including a power button and a light intensity control, the light intensity control operable to increase or decrease intensities of the first and second pluralities of LEDs.

28. The light of claim 27, wherein the first and second pluralities of LEDs are operable to be controlled remotely by a wireless communication scheme.