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US4761033A Expired / Lapsed US ⏱️ 0.0 years remaining

Chair

Assignee: DRABERT SHONE & Co A GERMANY Co GmbH
•
Filing: 1987-05-20
•
Granted: 1988-08-02
•
Expires: 2007-05-20
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Abstract

Abstract A chair with a seat support (7) has a seat plate (11) which is supported to the seat support (7) by means of a rear and a front guide rod. The chair has a back rest support (14a) that is pivot-hinged to the seat support (7). The seat support (7) is connected to a rigid, back rest angle support (1) by means of a front and a back parallelogram guide rod (3). The angle support is fixed to the bottom part of the chair (2). The parallelogram guide joints (3) are also connected to each other by means of a parallel guide rod (4). A first force storage member (5) is situated between the seat support (7) and the back rest angle support (1) and a second force storage member (15) is located between the back rest support (14a) and the seat support (7). The force necessary for the slope of the back rest is independent of the weight of the user. A user with higher weight must expend a higher amount of force for the slope of the back rest to move backward than a user with a lower weight.

Inventors

  • 👤 Max Lanuzzi
  • 👤 Fredi Dubach

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 16:55
CPC Classifications
A; A47; A47C; A47C31/00; A47C31/12; A47C31/126; A47C1/00; A47C1/02; A47C1/031; A47C1/032; A47C1/03255; A47C1/03261; A47C1/03272; A47C1/03283

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 130 words
A chair comprising: a seat support (7); a back rest support (14a) which is pivot-hinged to said seat support (7); a seat plate (11) connected to said seat support (7) by means of a rear and a front guide rod (10,12); a stationary back rest angle support (1) connected to said seat support (7) by means of a front and a rear parallelogram guide rod (3), said parallelogram guide rods (3) being connected with joints to each other by means of a parallel guide rod (4) extending therebetween; a first force storage member (5) arranged to act between said seat support (7) and said back rest angle support (1); and, a second force storage member (15) arranged to act between said back rest support (14a) and said seat support (7).
Claim 2
Dependent Claim 130 words
A chair comprising: a seat support (7); a back rest support (14a) which is pivot-hinged to said seat support (7); a seat plate (11) connected to said seat support (7) by means of a rear and a front guide rod (10,12); a stationary back rest angle support (1) connected to said seat support (7) by means of a front and a rear parallelogram guide rod (3), said parallelogram guide rods (3) being connected with joints to each other by means of a parallel guide rod (4) extending therebetween; a first force storage member (5) arranged to act between said seat support (7) and said back rest angle support (1); and, a second force storage member (15) arranged to act between said back rest support (14a) and said seat support (7).
Claim 3
Dependent Claim 39 words
A chair in accordance with claim 1 wherein said first force storage member (5) is hinged both at said seat support (7) and at a joint point (6) of said parallel guide rod and the parallelogram guide rod (3).
Claim 4
Dependent Claim 47 words
A chair in accordance with claim 2 wherein said second force storage member (15) is hinged at a pressure point (12a) of the guide rod (12) at the seat and at a joint point (3a) of said parallel guide rod (4) and the parallelogram guide rod (3).
Claim 5
Dependent Claim 29 words
A chair in accordance with claim 3 wherein said second force storage member (15) is hinged both at the seat support (7) and at the back rest support (14a).
Claim 6
Dependent Claim 55 words
A chair in accordance with claim 4 wherein said back rest support (14a) includes a section extending across its pressure point (14b) at the seat support (7) having free end connected to a guide rod (13), said rod being hinged to the rear guide rod (12) connecting said seat support (7) to said seat (11).
Claim 7
Dependent Claim 23 words
A chair in accordance with claim 5 wherein said parallelogram guide rods (3) are triangular-shaped with one joint point located in each corner.
Claim 8
Dependent Claim 15 words
A chair according to claim 6 wherein said force storage members (5, 15) are springs.
Claim 9
Dependent Claim 19 words
A chair in accordance with claim 6 wherein at least one force storage member (15) is a gas-filled spring.

References Cited (Backward Citations)

US2859799A Cited
DE2843058A1 Cited
US4640548A Cited
EP0164266A2 Cited
US4709962A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1991-08-02 1992-02-01 1992-08-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1995-08-02 1996-02-01 1996-08-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1999-08-02 2000-02-01 2000-08-02 $7700.00 Window Closed / Lapsed

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