Chair

Abstract

An office chair comprises a seat, a seatback, and a chair base with a central support on which a rocking mechanism comprising a supporting base is installed. A seatback frame comprises a transverse curved plate to which a preferably elastic vertical plate is attached by means of a pivotal connection in such a way that an axis of the pivotal connection is at about the middle of the seatback height. On its other end, the vertical plate is connected to a seatback base which in turn is connected to the supporting base. The seat is fixed to the rocking mechanism. Placed between the transverse plate and the upper part of the seatback is a gas-lift unit. Positioned on the vertical plate is an element for adjusting the initial position of the seatback. The chair can turn its seatback providing comfort for the user while taking various sitting positions.

Claims

1-3. (canceled)

4. A chair comprising a seatback, a seat, a rocking mechanism, and a chair base, the seatback comprising a frame and a seatback base, the chair base comprising a central support, the rocking mechanism comprising a supporting base and being arranged on the central support, the seat being affixed to the rocking mechanism, the seatback being connected to the rocking mechanism through the seatback frame comprising an intermediate transverse plate to which a vertical plate is fastened with one end thereof, the vertical plate being fastened to the seatback base with an opposite end thereof, the seatback base being connected to the supporting base of the rocking mechanism.

5. The chair as claimed in claim 4, wherein the seatback base comprises mutually perpendicular plates and shaped tubes welded to each other.

6. The chair as claimed in claim 4, wherein the seatback frame further comprises an upper transverse plate, and a gas strut is installed between the upper transverse plate and the intermediate transverse plate.

7. The chair as claimed in claim 4, wherein an element of stop and adjustment of an initial position of the seatback is attached to the vertical plate.

Description

[0022] The chair 100 comprises a seatback (1), a seat (2), and a five-prong base (3) with rollers (4). The base has a central support (5) on which a rocking mechanism (6) with a supporting base (7) is arranged. The seat (2) is fixed to the rocking mechanism (6). A supporting box (8) is mounted on the supporting base (7) by means of, for example, a bolted joint (not shown).

[0023] A backrest base (9), that consists of a plate (10), a pipe (11), plates (12, 13 and 14) fixed between each other by welding, is installed on the box (8) and fixed with screws to the supporting base (7).

[0024] A vertical plate (15) is connected to the plate (14) by means of the screwed connection. Due to the flexible properties of the vertical plate (15) the resilience resistance to the pivot motion of the backrest (1) is provided, and the manufacture of the plate (15) of metal increases the reliability and durability of the construction.

[0025] The plate (15) is connected to curved plates (16) by means of a screwed connection. Plates (17) are welded to the plates (16) in order to ensure the rigidity of the latter.

[0026] A backrest frame (18) is connected to the plates (16) by means of a pivotal connection (19). This arrangement of the pivotal connection ensures the redistribution of load on various muscle groups of the back when the user rests on the backrest.

[0027] A gas strut (21) is installed between the intermediate transverse plate (16) and an upper transverse plate (20) of the seatback frame (18); the gas strut 21 provides a smooth rotation of the seatback around the axis of the pivotal connection (19). On the vertical plate (15) there is an element (22) of stop and adjustment of the initial position of the seatback, consisting of a second box (23) and a screw (24).

[0028] In view of this the claimed utility model suggests a reliable, comfortable chair design that provides a comfortable position of the user's back and good flexibility when taking various sitting positions.