CHAIR ARM ASSEMBLY

Abstract

A chair assembly includes a four-rod coupling assembly comprising a first coupling member, a second coupling member, a third coupling member, and a fourth coupling member, each of which is rotatably coupled to one another, such that the four-rod coupling assembly includes an upper end that is adjustable between the raised and lowered positions, and an armrest assembly adapted to support the arm of a seated user and supported at the upper end of the four-rod coupling assembly, wherein a lower end of the four-rod coupling assembly is rotatably supported from an arm support structure for rotary motion, such that the upper end of the suitable four-rod coupling assembly moves between a first position and a second position located laterally outward from the first position.

Claims

1. A chair assembly, characterized in that it comprises: an arm support structure; an armrest assembly adapted to support the arm of a seated user; an arm support assembly having a lower end supported by the arm support structure, and an upper end supporting the armrest assembly thereon, wherein the arm support assembly is adjustable between a vertically raised position and a vertically lowered position; and a locking assembly, comprising: a first locking link having at least one first surface and a plurality of teeth;a second locking link having the other of the first surface and the plurality of teeth, and is movable between a locked position, in which the first surface engages with at least one of the plurality of teeth to prevent adjustment of the arm support assembly between the raised and lowered positions, and an unlocked position, in which the first surface is separated from the plurality of teeth, thereby permitting the arm support assembly to be adjusted between the raised and lowered positions; an actuating link operatively coupled with the first locking link and adapted to move between a first position, in which the first locking link is displaced by the actuating link into the locked position, and a second position, in which the first locking link is displaced by the actuating link into the unlocked position;and an actuating member operatively coupled with the actuating link, wherein at least a portion of the actuating member can be actuated by a seated user, thereby allowing the user to move the actuating link between the first and second positions.

2. The chair assembly according to claim 1, further characterized in that the second locking link is deflected into the locked position.

3. The chair assembly according to claim 1, further characterized in that the second locking link is deflected into the locked position by means of a leaf spring.

4. The chair assembly according to claim 1, further characterized in that the actuating link includes a leaf spring.

5. The chair assembly according to claim 1, further characterized in that the actuating link includes an arc-shaped splice surface, and wherein the actuating member is splice to the splice surface of the actuating link.

6. The chair assembly according to claim 1, further characterized in that the actuating link is rotatably coupled to the arm support assembly.

7. The chair assembly according to claim 1, further characterized in that the first locking link is rotatably coupled to the arm support assembly.

8. The chair assembly according to claim 1, further characterized in that the arm support assembly includes a four-rod coupling assembly comprising: a first coupling member having a first end and a second end; a second coupling member having a first end and a second end; a third coupling member having a first end rotatably coupled to the first end of the first coupling member to rotate about a first pivot point, and a second end rotatably coupled to the first end of the second coupling member to rotate about a second pivot point;and a fourth coupling member having a first end rotatably coupled to the second end of the first coupling member to rotate about a third pivot point, and a second end rotatably coupled to the second end of the second coupling member to rotate about a fourth pivot point.

9. The chair assembly according to claim 8, further characterized in that the third coupling member includes the plurality of teeth.

10. The chair assembly according to claim 1, further characterized in that the plurality of teeth forms an arched path.

11. The chair assembly according to claim 10, further characterized in that the arm support assembly is rotatably coupled to the arm support structure, and wherein the plurality of teeth forms the arced path around the pivot point between the arm support assembly and the arm support structure.

12. The chair assembly according to claim 1, further characterized in that a downward force exerted on the armrest assembly forces the first surface into engagement with at least one of the plurality of teeth.

13. The chair assembly according to claim 1, further characterized in that the actuating member is located close to the armrest assembly, so that a seated user can easily access the actuating member.

14. The chair assembly according to claim 1, further characterized in that the armrest support is rotatably adjustable with respect to the arm support structure.

15. The chair assembly according to claim 1, further characterized in that the armrest support is linearly adjustable with respect to the arm support structure.

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