Portable lighting device

• US 8,162,503 B2
• Filed: 06/20/2006
• Issued: 04/24/2012
• Est. Priority Date: 06/20/2005
• Status: Active Grant

• Current Assignee: Cooper Crouse-Hinds GmbH, (Eaton Corporation PLC.)
• Original Assignee: Cooper Crouse-Hinds GmbH, (Eaton Corporation PLC.)
• Inventors: Harnischmacher, Friedhelm
• Primary Examiner(s): SHALLENBERGER, JULIE A
• Application Number:
  US11/921,938
• Publication Number:
  US 20090268440A1
• Time in Patent Office: 2,135 Days
• Field of Search: 362/171, 362/178, 362/203, 362/319, 362/449, 362/174, 362/187, 362/188
• US Class Current: 362/187
• CPC Class Codes: F21L 4/027 the light sources being a LED
• CPC Class Codes: F21V 14/065 in portable lighting devices
• CPC Class Codes: F21V 21/0885 for portable lighting devices
• CPC Class Codes: F21V 23/0414 specially adapted to be used with portable lighting devices
• CPC Class Codes: F21V 25/12 Flameproof or explosion-proof arrangements
• CPC Class Codes: F21V 31/005 Sealing arrangements therefor
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A portable lighting device has at least one LED light source (2). Associated with this light source are a voltage supply (3) which can be switched on and off and a light distribution device (4) for varying a luminous intensity distribution of the light source (2).

In order to improve the light distribution device in the case of such a portable lighting device in a simple way in design terms and without a considerable amount of space being required, it has a lens system (5) which can be varied in its distance in relation to the light source (2).

Claims

1. A portable lighting device comprising:

at least one LED light source;

a voltage supply that is assigned to the light source and that is adapted to be switched on and off;

a light distribution device for varying a luminous intensity distribution of the light source, wherein;

the light distribution device comprises a lens system which is variable in its distance from the light source,

the lens system is configured as a lens disk with an integrated lens which comprises a convex portion oriented towards the light source, and

the lens system is held in a rotatable lighting device head; and

a substantially planar protection disk in the rotatable lighting device head, the protection disk arranged on an outer surface of the lens disk on a side of the lens system opposite a side facing the light source.

2. The portable lighting device of claim 1, wherein the lens system is supported to be adjustable in an axial lighting device direction in relation to a lighting device housing.

3. The portable lighting device of claim 1, wherein the light source is adjustably supported for on and off switching in an axial lighting device direction.

4. The portable lighting device of claim 3, wherein the light source is fixed in its axial position after having been switched on.

5. The portable lighting device of claim 3, wherein, in the switched-on state of the light source, a cooling device assigned to the light source is activated.

6. The portable lighting device of claim 5, wherein the cooling device is connected in the activated state to the voltage supply.

7. The portable lighting device of claim 1, wherein a distance between the lens system and the light source is variable by rotating the lighting device head.

8. The portable lighting device of claim 1, wherein the lighting device is explosion-proof.

9. The portable lighting device of claim 1, wherein the light source has a luminous intensity distribution with spotlight or wide-beam characteristic.

10. The portable lighting device of claim 5, wherein the cooling device is assigned to the light source on a side of the light source that is oriented away from the lens system.

11. The portable lighting device of claim 1, wherein the lighting head comprises a screwed-on screwing ring.

12. The portable lighting device of claim 1, wherein the lighting device is adapted to be switched off automatically.

13. The portable lighting device of claim 1, wherein the lens disk comprises at least one ring surrounding the lens and projecting in the direction of light source.

14. The portable lighting device of claim 1, wherein the light source has assigned thereto a contact ring which upon electrical contact with the light source switches the light source on.

15. The portable lighting device of claim 1, wherein the light source is arranged on an optical axis of the lens.

16. The portable lighting device of claim 13, wherein the at least one ring comprises an end that is standing on an end of a sleeve of the lighting head.

17. The portable lighting device of claim 11, wherein surrounding sealing elements are arranged between the lighting head and a lighting housing and between the screwing ring and the lighting device head.

18. The portable lighting device of claim 11, wherein surrounding sealing elements are arranged between the lighting device head and a lighting housing or between the screwing ring and the lighting device head.

19. The portable lighting device of claim 1, wherein the substantially planar protective disk is a colored protective lens.

20. The portable lighting device of claim 1, further comprising a lighting housing.

21. The portable lighting device of claim 1, wherein the lens disk comprises a substantially planar portion around the convex portion oriented toward the light source, and the lens disk holds the lens along a circumference of the lens.