RETRACTABLE LIGHT TOWER

• US 20110182066A1
• Filed: 01/28/2010
• Published: 07/28/2011
• Est. Priority Date: 01/28/2010
• Status: Active Grant

• Current Assignee: Clark Equipment Company (Doosan Heavy Industries and Construction Company Limited)
• Original Assignee: Clark Equipment Company (Doosan Heavy Industries and Construction Company Limited)
• Inventors: Webb, Raymond C.
• Granted Patent: US 8,303,143 B2
• Time in Patent Office: Days
• US Class Current: 362/235
• CPC Class Codes: F21V 21/22 telescopic
• CPC Class Codes: F21W 2131/1005 of working places, building sites or the like

Abstract

A portable light tower comprises a base and a mast. The mast is movable between a first configuration in which the mast is stored substantially within the base and a second configuration in which the mast extends in an upright position from the base. A light source is disposed on the base and a reflector is positioned on an end of the mast opposite the base. The reflector is configured to reflect light from the light source toward the surroundings of the light tower.

Claims

1. A portable light tower comprising:

a base;

a mast movable between a first configuration in which the mast is stored substantially within the base and a second configuration in which the mast extends in an upright position from the base;

a light source disposed on the base; and

a reflector positioned on an end of the mast opposite the base, the reflector configured to reflect light from the light source toward the surroundings of the light tower.

2. The portable light tower of claim 1, wherein the mast is formed by a plurality of mast segments interconnected in series.

3. The portable light tower of claim 2, wherein each mast segment comprises:

a backpiece having a front side, a back side, and first, second, third and fourth edges, wherein the first edge is opposite and parallel to the second edge, the third edge is perpendicular and adjacent the first edge, and the fourth edge is opposite and parallel to the third edge;

a first sidepiece, pivotally coupled along a first edge of the first sidepiece to the first edge of the backpiece; and

a second sidepiece, pivotally coupled along a first edge of the second sidepiece to the second edge of the backpiece.

4. The portable light tower of claim 3, wherein each mast segment is pivotally coupled along the third and fourth edges of the backpiece to the fourth and third edges, respectively, of the backpieces of the adjacent mast segments such that when the mast is in the first configuration, the mast can be rolled upon itself for compact stowage and when the mast is in the second configuration, the first and second sidepieces of each mast segment pivots about the first and second edge of each backpiece to form a rigid mast with a triangular cross section.

5. The portable light tower of claim 4, further comprising first and second cable members, wherein the first and second sidepieces of each mast are pivotally coupled to their respective backpiece by the first and second cable members being permanently fed through a plurality of hinge members along the first and second edges of the backpieces such that the mast may be tensioned by applying a strain to the first and second flexible wire members.

6. The portable light tower of claim 5, wherein the first and second cable members are plastic sheathed steel cables.

7. The portable light tower of claim 5, further comprising a third cable, wherein the third cable is inserted into a bore of a circular channel along a common axis of the first sidepiece and second sidepiece when the mast is transitioned from the first configuration to the second configuration and removed from the bore of the circular channel when the mast is transitioned from the second configuration to the first configuration such that the third cable maintains the first and second sidepieces of each mast segment in interlocked alignment when the mast is in the second configuration.

8. The portable light tower of claim 7, wherein each of the first and second sidepieces of each mast segment further comprises a tongue member along a third edge perpendicular to the first and second edges of the sidepiece, and a groove member along a fourth edge opposite and parallel third edge, such that the first and second sidepieces of each mast segment may interlock with the first and second sidepieces, respectively, of the adjacent mast segments.

9. The portable light tower of claim 7, wherein the plane between each interlocking member of each sidepiece has a compliant surface.

10. A portable light tower comprising:

a base including a housing that defines a base interior and an exterior;

a plurality of mast segments each movable between a stored position within the base interior and a use position in the exterior, each mast segment pivotally coupled to an adjacent mast segment when in the stored position and fixedly connected to the adjacent mast segment when in the use position;

a plurality of light sources positioned within the base interior and operable to project a plurality of light beams into the exterior; and

a curved reflector coupled to one of the mast segments and movable to an operating position at which the light beams are reflected toward the surroundings of the light tower.

11. The portable light tower of claim 10, further comprising a stiffening member coupled to the base and operable to rigidize the plurality of mast segments in the use position.

12. The portable light tower of claim 11, wherein the stiffening member includes a cable connected to a first of the plurality of mast segments and the base, the tension within the cable being controllable to produce a desired stiffness of the mast segment.

13. The portable light tower of claim 10, wherein each of the plurality of mast segments includes three planar members pivotally connected to one another.

14. The portable light tower of claim 13, wherein the three planar members pivot about first and second cables.

15. The portable light tower of claim 13, wherein each mast segment is movable from to a stored position in which the planar members are positioned in a flat arrangement to a use position in which the planar members are positioned in a triangular arrangement.

16. The portable light tower of claim 14, wherein the plurality of mast segments is arranged as a single series of adjacent mast segments.

17. The portable light tower of claim 15, wherein the plurality of mast segments is operable to form a roll of mast segments is in the storage position.

18. A portable light tower comprising:

a base including a housing that defines a base interior and an exterior;

a plurality of mast segments connected to one another, each mast segment arrangeable into a storage configuration or a use configuration, in the storage configuration, each of the plurality of mast segments being pivotally connected to an adjacent mast segment such that the mast segments can be one of rolled and folded for efficient storage within the base interior, in the use configuration, each of the plurality of mast segments being fixedly connected to an adjacent mast segment such that the mast segments can be extended to define a substantially rigid mast that extends above the base in the exterior;

a plurality of light sources positioned within the base interior and operable to project a plurality of light beams into the exterior; and

a semi-spherical reflector coupled to one of the mast segments and movable to an operating position at which the light beams are reflected toward the surroundings of the light tower.

19. The portable light tower of claim 18, wherein the base enclosure is operable to align and guide the mast segments when transitioning between storage and use configurations.

20. The portable light tower of claim 18, wherein each mast segment comprises:

a back piece;

a first side piece; and

a second side piece;

wherein the first side piece is pivotally connected to a first edge of the back piece and the second side piece is pivotally connected to a second edge of the backpiece, the second edge parallel to the first edge.

21. The portable light tower of claim 20, wherein each mast segment forms a rigid triangle in the use configuration, the back piece, first side piece and second side piece each forming a side of the triangle.