Source: http://www.google.com/patents/US5251958?ie=ISO-8859-1&dq=6246862
Timestamp: 2014-10-20 22:20:41
Document Index: 565477642

Matched Legal Cases: ['art. 2', 'art 5', 'art 7', 'art 5', 'art 7', 'art 5', 'art 7', 'art 5']

Patent US5251958 - Synchronous adjusting device for office chairs or the like - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA synchronous adjusting device is proposed as a chair mechanism for office chairs, seat furniture or the like, which is constructed extremely simply and with few mechanical components and which, if appropriate, can do without additional force accumulators. At the same time, the restoring movement of...http://www.google.com/patents/US5251958?utm_source=gb-gplus-sharePatent US5251958 - Synchronous adjusting device for office chairs or the likeAdvanced Patent SearchPublication numberUS5251958 APublication typeGrantApplication numberUS 07/752,503Publication dateOct 12, 1993Filing dateDec 21, 1990Priority dateDec 29, 1989Fee statusLapsedAlso published asCA2047746A1, CA2047746C, DE4041157A1, DE59006985D1, EP0461228A1, EP0461228B1, EP0578276A1, US5366274, WO1991009554A1Publication number07752503, 752503, US 5251958 A, US 5251958A, US-A-5251958, US5251958 A, US5251958AInventorsHans Roericht, Horst Fleischmann, Franz Biggel, Burkhard SchmitzOriginal AssigneeWilkhahn Wilkening & Hahne Gmbh & Co.Export CitationBiBTeX, EndNote, RefManPatent Citations (12), Referenced by (30), Classifications (10), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetSynchronous adjusting device for office chairs or the likeUS 5251958 AAbstract A synchronous adjusting device is proposed as a chair mechanism for office chairs, seat furniture or the like, which is constructed extremely simply and with few mechanical components and which, if appropriate, can do without additional force accumulators. At the same time, the restoring movement of the back part will take place as a function of the weight of the user, a restoring moment occurring with the increase in inclination of the backrest. For this, the back part (7) is mounted rotatably relative to the seat part (5) at a distance in height. The leaning force (9) of the user at the back leaning point (10) is counteracted by a restoring force in the lower region of the back part as a result of the articulated connection between the seat part and the back part (7).
We claim: 1. A chair comprising(a) a carrier structure of fixed location; said carrier structure having front and rear regions; (b) a back part having first and second locations of articulation; said first location of articulation being at a height level above said second location of articulation; said first and second locations of articulation defining a length portion of said back part; said first location of articulation of said back part being pivotally jointed to said rear region of said carrier structure, whereby upon pivotal movement of said back part, said second location of articulation moves along a circular path about said first location of articulation; (c) a seat part having front and rear regions; said rear region of said seat part being pivotally jointed to said second location of articulation of said back part; (d) a single coupling component connecting said front region of said seat part with said front region of said carrier structure such that the front regions of the seat part and the carrier structure are movable relative to one another; said single coupling component having an end; and (e) means for compelling said end of said single coupling component to travel in a circularly arcuate path having a center of curvature being fixed relative to said carrier structure; said end of said single coupling component being situated at all times at a height level below the second location of articulation of said back part. 2. The chair as defined in claim 1, wherein a distance between said center of curvature and said end of said single coupling component constitutes a radius of curvature of said path; said radius of curvature being situated at all times below said length portion of said back part.
STATE OF THE ART The invention starts from a synchronous adjusting device for office chairs, seat furniture or the like.
ADVANTAGES OF THE INVENTION The object on which the invention is based is to avoid the disadvantages described in relation to the state of the art and to propose a chair mechanism as a synchronous mechanism which is of extremely simple and effective construction, that is to say has few mechanical means and, if appropriate, can do without additional force accumulators and pressure units.
DRAWING Further details of the invention are illustrated in the drawing and explained in more detail in the following description. In the drawing:
DESCRIPTION OF AN EXEMPLARY EMBODIMENT The office chair 1 illustrated in FIG. 1 consists of a carrier structure 2 of fixed location, with a chair column 3 and with a seat part 5 connected to it in the front chair region 4 and a back part 7 articulated in the rear chair region 6. The seat part 5 is connected in an articulated manner to the carrier structure 2 via a pendulum lever 8. The back part 7 is connected rotatably to the carrier structure 2 at the articulation point A of fixed location. The articulated connection between the seat part 5 and the back part 7 is made at the articulation point B. The pendulum lever 8 is articulated at a fixed location on the carrier structure 2 at the point C. The articulated connection between the pendulum lever 8 and the seat part 5 is made at the point D (lever arm "c"). The a points A, B, C and D form the basis for the 4-point synchronous adjusting device of the office chair.
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