Ankle tilt mechanism

A - Human Necessities – 47 – C

Patent

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Details

155/22.3

A47C 3/02 (2006.01) A47C 3/026 (2006.01)

Patent

CA 1225321

Chair Tilt Mechanism Abstract A chair tilt mechanism (100) includes a support casting (110) mounted to a chair spindle (104) and a seat casting (130) having a chair seat (102) mounted thereon. A pair of elongated forward links (150) and a pair of triangular shaped rear links (160) are pivotably connected to both the seat casting (130) and support casting (110). A slidably mounted spring yoke (210) includes a front vertical portion (212) interconnected between rearwardly extending arms (214) which are pivot- ably connected to the rear links (160). As the seat casting (130) is tilted, the links (160) pivot away from an initially biased position and the spring yoke (210) compresses a coiled outer spring (200). A concentric coiled inner spring (202) is provided to increase the spring rate in the event that the outer spring (200) is compressed a certain degree. In a second embodiment, the springs are compressed by the movement of the front links rather than the rear links.

465554

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