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US 5,366,274 AGranted
Synchronous adjusting device for office chairs or the like
AssigneeWilkhahn Wilkening + Hahne GmbH + Co.
InventorsHans Roericht, Horst Fleischmann, Franz Biggel, Burkhard Schmitz
Life of this patent
Estimating the term…
Abstract
A synchronous adjusting device for a chair is provided where the restoring movement of a back part is effected as a function of the weight of the user, a restoring moment occurring with the increase in inclination of the backrest. For this purpose, the back part is mounted rotatably relative to the seat part at a distance in height. The leaning force of the user at the back leaning point 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.
Claims11
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 block affixed to said front region of said seat part and having an end;
- and
- (e) means for compelling said end of said block to travel in a circularly arcuate path having a center of curvature being fixed relative to said carrier structure;
- said end of said block being situated at all times at a height level below the second location of articulation of said back part;
- said means for compelling said end of said block to travel in a circularly arcuate path including a fixed curved guide forming part of said front region of said carrier structure;
- said end of said block being in contact with said fixed curved guide and being movable therealong upon movement of the front region of said seat part relative to the carrier structure.
11 more elements
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 different from 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;
- whereby upon pivotal movement of said back part said seat part moves in a forward or rearward direction;
- and
- (d) a hydraulic device comprising
- (1) means for defining first and second hydraulic chambers partitioned from one another;
- (2) volume changing means for increasing the volume of the first chamber and simultaneously decreasing the volume of the second chamber in response to the movement of said seat part in said forward direction and for increasing the volume of said second chamber and simultaneously decreasing the volume of the first chamber in response to the movement of said seat part in said rearward direction;
- (3) hydraulic line means connecting said first and second chambers with one another for guiding hydraulic fluid flowing between said first and second chambers upon volume changes thereof;
- and
- (4) valve means in said hydraulic line means for throttling the flow in said hydraulic line means at least in one flow direction, whereby motion of said back part and said seat part in at least one direction is hydraulically braked.
13 more elements
Dependencies are inferred from the claim text.