Chair footrest frame

• US 9,635,946 B2
• Filed: 09/11/2013
• Issued: 05/02/2017
• Est. Priority Date: 02/07/2013
• Status: Active Grant

• Current Assignee: Zhejiang Henglin Chair Industry Company Limited
• Original Assignee: Zhejiang Henglin Chair Industry Company Limited
• Inventors: Wang, Jianglin, Wang, Zhengxing
• Primary Examiner(s): White, Rodney B
• Application Number:
  US14/763,819
• Publication Number:
  US 20150359343A1
• Time in Patent Office: 1,329 Days
• Field of Search: 2974232
• CPC Class Codes: A47C 7/506 of adjustable type
• CPC Class Codes: A47C 7/5062 rectilinearly
• CPC Class Codes: A47C 7/5066 by rotation

Abstract

Disclosed is a chair footrest frame, comprising a base sliding block (1) fixed to both sides of a bottom face of a chair base, sliding rods (2) arranged in a sliding manner respectively on the base sliding blocks (1), a footrest cushion (7) provided between the two sliding rods (2), and a roller ball (12) suitable for the sliding of the sliding rods (2) being provided on the base sliding block (1). The frictional force between the sliding rods and the base sliding block is relatively small, abrasive wear is relatively low, and operation is simple and convenient, which benefit improvement of the functionality and service life of the footrest frame.

Claims

1. A chair footrest frame, comprising a base sliding block (1) fixed to both sides of a bottom face of a chair base, two sliding rods (2) arranged in a sliding manner respectively on the base sliding blocks (1), and a footrest cushion (7) provided between the two sliding rods (2), wherein a roller ball (12) suitable for the sliding of the sliding rods (2) is provided on the base sliding block (1);

wherein a rotating central shaft (3) in rotational connection with the two sliding rods (2) is arranged between the two sliding rods (2), and the rotating central shaft (3) is provided with angle iron fixtures (4) for fixing the footrest cushion (7); and

each sliding rod (2) is provided with a plastic sliding block (5);

the plastic sliding block (5) is formed with openings (51) and sliding chutes (52) coaxial with the openings (51);

two ends of the rotating central shaft (3) are respectively sleeved in corresponding openings (51); and

the sliding chutes (52) are in sliding connection with locating pins (6) capable of resisting to two ends of the sliding chutes (52) and linking with the rotating central shaft (3).

2. The chair footrest frame according to claim 1, wherein each base sliding block (1) is provided with a sliding hole (11) sleeved with a corresponding sliding rod (2), and the roller ball (12) is disposed between an inner wall of the sliding hole (11) and an outer wall of the corresponding sliding rod (2).

3. The chair footrest frame according to claim 2, wherein the sliding hole (11) is internally provided with a roller frame (13), and the roller frame (13) is formed with a slot for embedding the roller ball (12).

4. The chair footrest frame according to claim 3, wherein the width of the slot is smaller than the diameter of the roller ball (12).

5. The chair footrest frame according to claim 4, wherein the slot is shaped as a strip or shaped as a round hole corresponding to the roller ball (12).

6. The chair footrest frame according to claim 3, wherein the slot is shaped as a strip or shaped as a round hole corresponding to the roller ball (12).

7. The chair footrest frame according to claim 1, wherein the radian formed by the sliding chutes (52) is 2π

/3-π

.

8. The chair footrest frame according to claim 1, wherein the footrest cushion (7) is provided with a magnet (71) such that when the footrest cushion (7) is folded below the chair base, the magnet (71) and a tray below the chair base generate a magnetic absorption force therebetween.

9. The chair footrest frame according to claim 1, wherein the plastic sliding block (5) is formed with a clamping groove (53);

each base sliding block (1) is fixedly connected with a spring plate (14) with a projection (141) matched with the clamping groove (53).