Tilting control assembly for chair
AssigneeItoki Crebio Corporation
InventorsShunichi Takamatsu, Hirozi Kubo, Katsunori Hama, Hiroshi Iwabuchi
Life of this patent
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Abstract
The present invention provides a tilting control assembly for a chair. The chair comprises a support device, a seat supported above the support device, and a seat back arranged behind the seat to tilt rearwardly. The tilting control assembly comprises a tilting control spring device for elastically supporting the seat back against rearward tilting thereof via a load applying member, a displacing mechanism responsive to a downward load applied to the seat for causing the load applying member to move relative to the spring device, and a lock device for preventing the load applying member from moving reversely relative to the spring device when the seat back is rearwardly tilted.
Claims10
A tilting control assembly for a chair, the chair comprising:
- support means;
- a seat supported above the support means;
- and a seat back arranged behind the seat to tilt rearwardly with a tiltable member which is pivotally connected to the support means;
- the tilting control assembly comprising:
- tilting control spring means for elastically supporting the seat back against rearward tilting thereof via load applying means;
- and displacing means responsive to a downward load applied to the seat for causing relative displacement between the tilting control spring means and the load applying means in a manner such that the tilting control spring means provides a progressively larger supportive force as the downward load increases;
- and
- lock means for preventing reverse relative movement between the tilting control spring means and the load applying means at least while the seat back is rearwardly tilted;
- wherein the lock means comprises ratchet gear means mounted on the tiltable member for rotation in response to the relative movement between the tilting control spring means and the load applying means, and ratchet pawl means releasably engageable with the ratchet gear means.
A tilting control assembly for a chair, the chair comprising:
- support means;
- a seat supported above the support means;
- and seat back arranged behind the seat to tilt rearwardly with a tiltable member which is connected to the support means to pivot about a pivotal axis;
- the tilting control assembly comprising:
- tilting control spring means for elastically supporting the seat back against rearward tilting thereof via load applying means;
- and displacing means responsive to a downward load applied to the seat for causing relative displacement between the tilting control spring means and the load applying means in a manner such that the tilting control spring means provides a progressively larger supportive force as the downward load increases;
- and
- lock means for preventing reverse relative movement between the tilting control spring means and the load applying means at least while the seat back is rearwardly tilted;
- wherein the displacing means comprises a slider slidably mounted on the tiltable member for carrying the load applying means, the slider being pivotally moveable with the tiltable member about the pivotal axis;
- wherein the lock means comprises friction means which applies a frictional locking force to the slider only when the seat back is tilted rearwardly with the tiltable member.
Dependencies are inferred from the claim text.