US5547252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Office chair
Assignee: Girsberger Holding AG
•
Filing: 1994-08-12
•
Granted: 1996-08-20
•
Expires: 2014-08-12
Abstract
Abstract A chair (1), in particular a swiveling office chair, has a seat support (6) fastened to a lower part (7) joined in a swiveling fashion with a seat (2) that is motionally coupled with a backrest (3) by a synchronizing sliding guide (5) or by a similar synchronizing mechanism, whereby the seat (2) is supported by a readjusting apparatus (8) that acts against swinging movement. The chair (1) is characterized by the seat support (6) being guided at the lower part (7) in an approximately vertical direction, and by having within the movement transmission path between the backrest (3) and the lower part (7) of the chair, an apparatus (14) for blocking of and/or compensating for movement transmitted to the readjusting apparatus (8) during a backward swiveling movement of the backrest (3). The readjusting force of the backrest (3) is automatically adapted depending on the weight of the person using the chair, and increases with increasing inclination of the backrest. The chair is distinguished by its simple construction and compact design.
Inventors
- 👤 Reto Pfenniger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:09
CPC Classifications
A; A47; A47C; A47C1/00; A47C1/02; A47C1/031; A47C1/032; A47C1/03294; A47C1/03255; A47C1/03261; A47C1/03277; A47C1/03279; A47C3/00; A47C3/20; A47C3/30; A47C31/00; A47C31/12; A47C31/126
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
138 words
A chair, particularly, an office chair, comprising a seat support (6) fastened to a lower chair part (7) and joined in a swiveling fashion with a seat (2) that is movably coupled with a backrest (3) by means of a synchronizing sliding guide (5), wherein the seat (2) is supported by a readjusting apparatus (8) that acts against swiveling movement, the seat support (6) being guided at the lower chair part (7) in an approximately vertical direction, the seat (2) being supported at the lower chair part (7) by the readjusting apparatus (8), whereby a movement transmission path is provided between the backrest (3) and the lower part (7) of the chair, and further comprising a blocking apparatus (14) to compensate for movement transmitted to the readjusting apparatus (8) during a backward swinging movement of the backrest (3).
Claim 2
Dependent Claim
138 words
A chair, particularly, an office chair, comprising a seat support (6) fastened to a lower chair part (7) and joined in a swiveling fashion with a seat (2) that is movably coupled with a backrest (3) by means of a synchronizing sliding guide (5), wherein the seat (2) is supported by a readjusting apparatus (8) that acts against swiveling movement, the seat support (6) being guided at the lower chair part (7) in an approximately vertical direction, the seat (2) being supported at the lower chair part (7) by the readjusting apparatus (8), whereby a movement transmission path is provided between the backrest (3) and the lower part (7) of the chair, and further comprising a blocking apparatus (14) to compensate for movement transmitted to the readjusting apparatus (8) during a backward swinging movement of the backrest (3).
Claim 3
Dependent Claim
40 words
The chair in accordance with claim 1, wherein the blocking apparatus (14) operates against transmission of movement between the seat support (6) and the lower chair part (7), and is activated during a backward swinging movement of the backrest (3).
Claim 4
Dependent Claim
20 words
The chair in accordance with claim 1, wherein the blocking apparatus (14) is coupled with the synchronizing sliding guide (5).
Claim 5
Dependent Claim
86 words
The chair in accordance with claim 1, wherein the readjusting apparatus (8) comprises a force adjusting torsion bar (9) located in a swiveling axis between the seat (2) and the seat support (6), the torsion bar (9) being held at the seat (2) in a fixed manner so it cannot rotate and joined to one end of a support lever (10), in a fixed manner so it cannot rotate, the support lever (10) being supported near its other free end, on the lower chair part (7).
Claim 6
Dependent Claim
40 words
The chair in accordance with claim 1, wherein the blocking apparatus (14) is configured as a braking device that is rigidly joined to the seat support (6) and that, in a blocking position, engages with the lower chair part (7).
Claim 7
Dependent Claim
18 words
The chair in accordance with claim 5, wherein the braking device frictionally engages the lower chair part (7).
Claim 8
Dependent Claim
17 words
The chair in accordance with claim 1 wherein the blocking apparatus (14) comprises a clamping collar (15).
Claim 9
Dependent Claim
49 words
The chair in accordance with claim 7, wherein the clamping collar (15), encompasses a section of the lower chair part (7) that protrudes in an approximately vertical direction and, in its blocking position, lies at least partially in frictional engagement against the section of the lower chair part (7).
Claim 10
Dependent Claim
64 words
The chair in accordance with claim 7, wherein the clamping collar (15) comprises two free collar arms (16, 17), at least one of the two free collar arms (16, 17) being provided with an outwardly directed ramp bevel (18), the ramp bevel (18) cooperating with a corresponding matching bevel (19) supported in an essentially immovable manner axially and movably coupled with the backrest (3).
Claim 11
Dependent Claim
16 words
The chair in accordance with claim 9, wherein the ramp bevel (18) has a helical shape.
Claim 12
Dependent Claim
79 words
The chair in accordance with claim 9, wherein each of the two free collar arms (16, 17) of the clamping collar (15) has a helical ramp bevel (18) having a helical shape, each of the two ramp bevels (18) has an associated matching bevel (19) that is supported in an essentially immovable fashion axially, and the ramp bevels (18) have beveled surfaces on opposite sides of the clamping collar whose helical shapes are oriented in opposite directions of rotation.
Claim 13
Dependent Claim
83 words
The chair in accordance with claim 11, wherein the backrest (3) is joined with a backrest support (11) that is guided in an adjustable fashion in the synchronizing sliding guide (5), the backrest support (11) being joined to at least one clamping lever (22) that is supported in a pivoting fashion on a common axis of rotation (21) with the matching bevels (19), each clamping lever (22) being associated with a matching bevel (19) that is joined to it in a non-rotating fashion.
Claim 14
Dependent Claim
25 words
The chair in accordance with claim 1, wherein the lower chair part (7) is adjustable in height and comprises for that purpose two vertical guides.
Claim 15
Dependent Claim
46 words
The chair in accordance with claim 13, wherein the vertical guides comprise two enclosing guide bushings (24, 25), of which a first guide bushing (24) is associated with a height adjustment element (26), and a second guide bushing (25) is associated with the seat support (6).
Claim 16
Dependent Claim
18 words
The chair in accordance with claim 14, wherein the height adjustment element (26) comprises a gas pressure spring.
Claim 17
Dependent Claim
41 words
The chair in accordance with claim 14, wherein the blocking apparatus (14) comprises a clamping collar (15) which in its blocking position, engages with an upper section of the height adjustment element (26) that projects above the first guide bushing (24).
References Cited (Backward Citations)
US3830491A
Cited
US4685733A
Cited
US4707028A
Cited
DE8614185U1
Cited
US4979778A
Cited
DE4235691A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-20 | 2000-02-19 | 2000-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-20 | 2004-02-19 | 2004-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-20 | 2008-02-19 | 2008-08-20 | $7700.00 | Window Closed / Lapsed |