Chair seat adjustment assembly

Details Chair seat adjustment assembly Chair seat adjustment assembly

A - Human Necessities

47

C

155/34

A47C 3/00 (2006.01) A47C 1/032 (2006.01) A47C 3/026 (2006.01) A47C 7/44 (2006.01)

Patent

CA 1162833

ABSTRACT OF THE DISCLOSURE The specification discloses a seat pitch adjustment assembly which a user can adjust upwardly or downwardly with basically the same applied force. A seat support is pivotally mounted with respect to a supporting assembly at one point and is joined thereto at another point through a pivot bracket. The pivot bracket is pivotally mounted to the support assembly on one pivot axis and to the seat support on a second pivot axis. The pivot bracketing includes a cylindrical wall defining at least a portion of the wall of a right circular cylinder whose axis of revolution lies on the aforesaid second pivot axis. The cylindrical wall includes at least one helically oriented slot receiving a projection from a slide slidably mounted on the seat support member whereby movement of the slide one way or the other rotates the pivot bracket about said second pivot axis and thereby changes the relative elevation of the first pivot axis with respect thereto. This in turn changes the pitch of the seat support with respect to the underlying support assembly and thereby changes the pitch of a seat mounted thereon.

375862

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