Swivel arrangement for a chair seat

Chairs and seats – Back movement resiliently opposed in operating position

Reexamination Certificate

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Details

C297S300400, C297S300500, C297S300700, C297S301400, C297S301600, C297S302400, C297S302600

Reexamination Certificate

active

06276755

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a swivel arrangement for a chair seat that provides improved sitting comfort and safety and easier operation and assembly.
2. Description of the Related Art
A typical chair is shown in
FIGS. 10 and 11
and includes a backrest
1
′, a chair seat
2
′, a chassis
3
′, a pneumatic rod
4
′, and a base
5
′. A lower end of the backrest
1
′ is connected to the chair seat
2
′. The chassis
3
′ includes a swivel seat
31
′, a connecting seat
32
′, a spring seat
33
′, an adjusting rod
34
′, and a connecting rod
35
′. The swivel seat
31
′ includes a number of holes
311
′ in corner areas thereof for connection with the chair seat
2
′, a hole
312
′ in a mediate portion thereof for connection with the spring seat
33
′, and lateral holes
313
′ and
314
′ through which the adjusting rod
34
′ and the connecting rod
35
extend, respectively. The connecting seat
32
′ includes a hole
321
′ through which the pneumatic rod
4
′ extends. The connecting seat
32
′ further includes lateral holes
322
′ and
323
′ through which the adjusting rod
34
′ and the connecting rod
35
extend, respectively. The connecting seat
32
′ further includes a hole
324
′ for mounting the spring seat
33
′. The spring seat
33
′ includes a sleeve
332
′, a spring
331
′ partially mounted in the sleeve
332
′, and a threaded rod
333
′ that extends through the hole
312
′ in the swivel seat
31
′ and securely engages with a lower end of the sleeve
332
′. The adjusting rod
34
′ includes an end
341
′ extended through the lateral hole
313
′ to restrain swivel movement of the swivel seat
31
′. The adjusting rod
34
′ further includes a pressing section
342
′ to press against an upper end of the pneumatic rod
4
′ to adjust the level of the chair seat
2
′.
Although the seat
2
′ and the backrest
1
′ can be swiveled due to provision of the spring
331
′, the inclination angle of the backrest
1
′ relative to the seat
2
′ cannot be fixed. In addition, as shown in
FIG. 12
, the user might fall from the chair when the rearward motion of the backrest
1
′ goes too far, since the seat
2
′ swivels together with the backrest
1
′.
FIG. 13
of the drawings illustrates another conventional chair that includes a backrest
6
′ that is connected to a movable seat
62
′ via a connection rod
61
′. The movable seat
62
′ is connected to a chassis
7
′ that includes an elastic means
71
′ to allow back-and-forth swivel motion of the backrest
6
′. The chair seat
8
′ and the backrest
6
′ are secured together to provide improved sitting stability and safety. Two control rods (not labeled) are attached to the chassis
7
′ to respectively control the level of the backrest
6
′ and swivel motion of the backrest
6
′. Nevertheless, the chair seat
8
′ is thoroughly fixed and thus provides less sitting comfort. In addition, two control rods are required to control the level and inclination angle of the backrest
6
′ and thus result in inconvenient operation to the user and inconvenient assembly.
SUMMARY OF THE INVENTION
In accordance with the present invention, a swivel arrangement is provided for a chair having a backrest, a chair seat, a chassis, and a base. The chassis includes a swivel seat mounted to an underside of the chair seat, a first connecting seat, a second connecting seat, a spring seat, a control device, and an adjusting rod. The swivel seat includes a hole and a stop adjacent to the hole. The control device includes a pressing plate engaged with an inner end of the adjusting rod and an operative block with a pressing portion. The first connecting seat, the swivel seat, and the second connecting seat are connected by axle rods. The adjusting rod is movable along a longitudinal axis thereof between a first position and a second position, wherein when the adjusting rod is in the first position, the pressing portion of the operative block is aligned with the hole of the swivel seat to allow back-and-forth swivel movements of the swivel seat and the second connecting seat, and wherein when the adjusting rod is in the second position, the pressing portion of the operative block is aligned with and thus stopped by the stop of the swivel seat to thereby prevent back-and-forth swivel movements of the swivel seat and the second connecting seat. When the second connecting seat swivels rearward, the swivel seat swivels rearward by an angular displacement smaller than that of the second connecting seat.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 3356414 (1967-12-01), Doerner
patent: 4123103 (1978-10-01), Doerner
patent: 4664445 (1987-05-01), Groseth
patent: 5066069 (1991-11-01), DeGelder
patent: 5222783 (1993-06-01), Lai
patent: 5447357 (1995-09-01), Dauphin
patent: 6039398 (2000-03-01), Gorgi et al.
patent: 6120096 (2000-09-01), Miotto
patent: 6131998 (2000-10-01), Su

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