Rotation control device for support arm of a lamp

• US 7,717,375 B2
• Filed: 03/19/2008
• Issued: 05/18/2010
• Est. Priority Date: 03/19/2008
• Status: Expired due to Fees

• Current Assignee: Seed Lighting Design Co., Ltd.
• Original Assignee: Seed Lighting Design Co., Ltd.
• Inventors: Chen, Meiric
• Primary Examiner(s): Ramirez; Ramon O
• Application Number:
  US12/050,954
• Publication Number:
  US 20090236481A1
• Time in Patent Office: 790 Days
• Field of Search: 248/125.7, 248/121, 248/122.1, 248/176.1, 248/284.1, 248/291.1, 248/292.14, 248/282.1, 248/289.11, 362/285, 362/287, 362/414, 362427-429, 362/431
• US Class Current: 248/125.7
• CPC Class Codes: F21S 6/003 for task lighting, e.g. for reading or desk work, e.g. angle poise lamps
• CPC Class Codes: F21V 21/26 Pivoted arms

Abstract

A rotation control device for a support arm of a lamp comprises a support arm having a first end and a second end; a rotating arm having a first end and a second end; a lamp head assembled to the second end of the rotating arm; a cambered track fixed to a predetermined position of the support arm; and a cambered slot being formed in the cambered track; a stop sheet installed to a predetermined position of the cambered track; the stop sheet being movable along the cambered slot of the cambered track and is fixable at a predetermined position so that the rotating arm is retained to a predetermined angle.

Claims

1. A rotation control device for a support arm of a lamp, comprising;

a support arm having a first end;

a second end and a tube joint (24) between the first end and the second end;

the tube joint (24) having a protrusion (241) which is formed with a threaded hole (242);

a rotating arm having a first end and a second end;

a lamp head assembled to the second end of the rotating arm;

a cambered track fixed to a predetermined position of the support arm; and

a cambered slot being formed in the cambered track;

a stop sheet; and

wherein the stop sheet is a threaded rotating button which is screwed to the threaded hole (242) of the protrusion (241) of the rotating arm (20); and

the protrusion of the rotation arm passes through the cambered slot of the cambered track so that the stop sheet (60) is movable along the cambered slot; and

wherein the stop sheet (60) has a handle (61), a press plate (62) connected to the handle (61), and a stud portion (63) connected to the press plate (62), the press plate is formed with a pressing surface;

when the stud portion (63) passes through the cambered slot (51) of the cambered track (50) and is screwed to the threaded hole (242) of the protrusion (241) of the tube joint (24), they form a cambered guide structure;

when the pressing surface of the press plate (62) presses upon the cambered track (5), the rotating arm (20) is guided along the cambered track (50) to be at a predetermined angle.

2. The rotation control device for a support arm of a lamp as claimed in claim 1, wherein the second end of the support arm and the first end of the rotating arm are pivotally connected to be as a rotation fulcrum;

and a compressible spring is connected therebetween to provide a predetermined rotating pressure to the fulcrum.

3. The rotation control device for a support arm of a lamp as claimed in claim 1, wherein the cambered track and support arm are retained through two points.

4. The rotation control device for a support arm of a lamp as claimed in claim 3, wherein a threaded stud and a shaft stud are used to retain the cambered track to the support arm at the two points.

5. The rotation control device for a support arm of a lamp as claimed in claim 1, wherein a first end of the support arm has a base.

6. The rotation control device for a support arm of a lamp as claimed in claim 1, wherein a pivot head is assembled to a lamp head which is pivoted to the second end of the rotating arm to form as a rotation fulcrum.