Chair

• US 5,080,435 A
• Filed: 06/19/1991
• Issued: 01/14/1992
• Est. Priority Date: 06/22/1990
• Status: Expired due to Term

• Current Assignee: Haworth Incorporated
• Original Assignee: Haworth Incorporated
• Inventors: Desanta, Simon
• Primary Examiner(s): Cranmer, Laurie K.
• Application Number:
  US07/717,377
• Time in Patent Office: 209 Days
• Field of Search: 297/316, 297/317, 297/319, 297/320, 297/321, 297/322, 297/354, 297/355, 297/356, 297/300, 297/301
• US Class Current: 297/316
• CPC Class Codes: A47C 1/03255 with a central column, e.g. rocking office chairs

Abstract

A chair, in particular an office chair, including a seat and a back rest which are pivotal in relationship to a supporting column supporting these. The back rest is mounted on a carrier for pivotal movement about a fixed first horizontal axis. A downwardly directed first control means is mounted on the carrier for pivotal movement about a second axis which is located in front of the first axis. The lower area of the first control means is mounted for pivotal movement about a third axis at the lower end of a second control means. The second control means extends upwardly to the front area of the seat and there is connected for pivotal movement about a fourth axis. The carrier is connected at a fifth horizontal axis located below the second axis on the carrier to a substantially horizontal third control means, the other end of which third control means is pivotally coupled connected for pivotal movement about a sixth axis, lying above the third axis, with the second control means. The carrier, through which the back rest is pivotally mounted to the column, and the second control means, which supports the front area of the seat, are therefore coupled through the intersecting control means so that the back rest and the seat carry out reflected inverted image movements so to speak and remain balanced during any type or force by the user of the chair.

Claims

1. In a chair, in particular an office chair, comprising a seat and a back rest which are pivotal in relationship to a supporting column, the improvement which comprises:

the back rest is mounted on a carrier which is pivotable about a first horizontal axis which is fixed with reference to the column, a downwardly directed first control means is mounted for pivotal movement about a second axis which is provided on the carrier in front of the first axis, a second control means is directed upwardly toward a front section of the seat, a lower end of said first control means being mounted for pivotal movement about a third axis at a lower end of said second control means, an upper end of said second control means being connected for pivotal movement about a fourth axis with respect to the front section of said seat, said carrier is connected for pivotal movement about a fifth horizontal axis mounted below the second axis on the carrier with respect to a substantially horizontal third control means, the other end of said third control means being mounted for pivotal movement about a sixth axis lying above the third axis on the second control means.

2. A chair according to claim 1, in which a rearward area of the seat is supported by the carrier for front to rear reciprocating movement.

3. A chair according to claim 1, characterized in that the first, axis, of the carrier is fastened on a rearwardly directed arm of the column.

4. A chair according to claim 1, characterized in that the fourth axis between the front section of the seat and the second control means is formed by elastic blocks.

5. A chair comprising an upright column, a backrest carrier extending rearwardly from said column and mounted thereon for pivotal movement with respect thereto about a first horizontal pivot axis which extends transversely to said carrier, a backrest mounted on said carrier for pivotal movement therewith about said first pivot axis, a seat having a rear end and a front end, said seat being movable forwardly and rearwardly relative to said backrest;

a downwardly extending first control link located below said seat and having an upper end pivotally connected to said carrier for pivotal movement with respect thereto about a second horizontal pivot axis which is located in front of said first pivot axis and is parallel thereto, an upwardly extending second control link having a lower end pivotally connected to the lower end of said first control link for pivotal movement about a third horizontal pivot axis which is located below said first pivot axis and is parallel thereto, said second control link being inclined forwardly and being connected to the underside of said seat toward the front thereof for pivotal movement about a fourth horizontal pivot axis which is located in front of said second and third pivot axes and is parallel thereto, a substantially horizontal third control link having a front end and, a rear end, the rear end cf said third link being pivotally connected to said carrier for pivotal movement about a fifth horizontal pivot axis which is parallel with said first and second pivot axes and is located therebelow and close to the front of said carrier, and the front end of said third link is pivotally connected to said second control link for pivotal movement about a sixth pivot axis which is parallel with and is located between said third and fourth pivot axes, said third control link extending substantially at a right angle to and crossing the second control link.