Locking chair tilt mechanism with torsion bar
First Claim
1. In a chair comprising:
- a base;
a chair frame for supporting a seat and a backrest;
an elongated opening in said frame near the front edge of a seat portion thereof; and
a tilt mechanism mounted between said base and said chair frame for tilting movement of the seat and backrest relative to the base, said tilt mechanism including means to bias the chair frame to an upright position, at least one front support arm which is fixedly mounted at a lower end to the base and at an upper end is both slidably and pivotably mounted in said elongated opening in the frame, and a back support arm having a lower end pivotally mounted to the base and an upper end pivotally mounted to the frame; and
a locking mechanism between said front support arm and the chair frame to selectively lock said chair frame in one of several tilted positions.
1 Assignment
0 Petitions
Accused Products
Abstract
A locking chair tilt mechanism for a chair in which the backrest and rear seat portion tilt rearwardly and downwardly, and the front seat portion of the chair slides generally horizontally is disclosed. The chair is supported by a tilt mechanism mounted between the base and the chair. Front and rear support arms extend from the biasing member mounted on top of the base, to the chair frame. The front support arm is slidably and pivotably mounted to the chair frame to create the horizontal sliding movement of the front portion of the chair. The locking mechanism mounts immediately adjacent the elongated opening and comprises a pivotable locking bar, a high pitch screw fixedly attached to said bar, a rack with a first set of teeth and a gripping member threadably mounted on said screw with a second set of teeth. The first and second set of teeth are selectively cooperable upon rotation of the locking bar and screw through movement of the threadably mounted gripping member.
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Citations
24 Claims
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1. In a chair comprising:
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a base; a chair frame for supporting a seat and a backrest; an elongated opening in said frame near the front edge of a seat portion thereof; and a tilt mechanism mounted between said base and said chair frame for tilting movement of the seat and backrest relative to the base, said tilt mechanism including means to bias the chair frame to an upright position, at least one front support arm which is fixedly mounted at a lower end to the base and at an upper end is both slidably and pivotably mounted in said elongated opening in the frame, and a back support arm having a lower end pivotally mounted to the base and an upper end pivotally mounted to the frame; and a locking mechanism between said front support arm and the chair frame to selectively lock said chair frame in one of several tilted positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. In a chair comprising;
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a base; a chair frame for supporting a seat and a backrest; an elongated opening in said frame near the front edge of a seat portion thereof; and a tilt mechanism mounted between said base and said chair frame for tilting movement of the seat and backrest relative to the base, said tilt mechanism including means to bias the chair frame to an upright position and at least one front support arm which is fixedly mounted at a lower end to the base and at an upper end which is both slidably and pivotably mounted in said elongated opening in the frame; the improvement comprising; at least one back support arm which is mounted between said biasing means and said chair frame wherein a lower end of said back support arm is fixedly mounted to the biasing means and an upper end is mounted to the frame. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification