Chair adjustment mechanism

摘要

The chair adjustment mechanism, attached beneath a chair arm, has a housing and four walls forming an interior closed space. A closing bottom wall has a longitudinal guide slot. A longitudinal continuous serpentine adjustment cam surface. A cam follower on an adjustment plate moves on the cam surface in the interior space. The adjustment plate movably extends through the guide slot in a close fit and substantially closes the guide slot thereat. In one embodiment, each sidewall defines an opposing cam surface and a pair of cam followers extend laterally from an upper region of the adjustment plate. The lower plate extends outward from the slot and is preferably attached to two chair legs. The adjustment plate moves vertically, first out from the depending cam ridges, then the plate and cam follower moves longitudinally, and then moves vertically into a different intersection between adjacent depending cam ridges.

主权项

1. An adjustment mechanism for a chair which adjustment mechanism is attached beneath a chair arm rest, comprising:
a housing attached beneath the chair arm rest, the housing having a forward wall, a rearward wall and a pair of opposing side walls extending between the forward and rear walls and a bottom wall which collectively define, in conjunction with the chair arm rest, an interior closed space; the bottom wall having a single guide slot therein extending longitudinally in the housing and having a predetermined lateral slot width; said housing, defining in said interior closed space, a longitudinal continuous serpentine adjustment surface having at least first and second longitudinally spaced adjustment surface segments, the serpentine adjustment surface defines a cam surface for a cam follower on an adjustment plate which adjustment plate movably extends through said guide slot; said adjustment plate having an upper plate region extending into said interior closed space and a lower plate region extending below the bottom wall of said housing, the upper and lower adjustment plate regions being planar with a thickness complementary to said guide slot lateral width such that the adjustment plate substantially closes the guide slot thereat; said cam follower formed in the upper plate region which moves over the serpentine cam surface as the adjustment plate moves longitudinally within the interior closed space; said lower plate region extends outward from said guide slot and is configured to be attachable to a component of the chair; wherein the adjustment plate is movable between a first vertical position and a second vertical position relative to the housing, in the first vertical position the adjustment plate is able to move in the longitudinal direction from one side of the serpentine cam surface to the other side of the serpentine cam surface, in the second vertical position the cam follower on the adjustment plate is able to engage either one of the first and second adjustment surface segments to selectively adjust a longitudinal position of the adjustment plate relative to the housing.