Chairs and seats – Movable back
Patent
1990-01-16
1991-08-06
Brown, Peter R.
Chairs and seats
Movable back
248408, 2482973, 403107, A47C 746
Patent
active
050371584
ABSTRACT:
A height adjustment mechanism for controlling the height of a chair back relative to a chair seat. A vertical member contains a centrally located camming slot that is elongated in a vertical direction and has a series of notches located along one side and a smooth surface located along the other side. The top and bottom of the camming slot contain downwardly directed camming surfaces. The back adjustment plate includes a centrally located horizontal slot. A guide pin is positioned within the slot and is supported by an S-shaped leaf spring. When the guide pin is moved in either direction away from the central axis of the slot, the spring causes the pin to be biased in the direction that the pin has been moved away from. In order to raise the chair back relative to the seat, the chair back is grasped by the user and pulled in an upward direction whereupon the pin is urged in the direction of the notches and registers in each of the notches as the chair back is moved in an upward direction. In order to lower the seat back, the seat back is raised fully which causes the pin to be urged in the direction of the smooth surface. As the pin rides along the upper surface in the direction of the smooth surface, the pin will pass the halfway point in the slot and spring will urge the pin in the direction of the surface.
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Brown Peter R.
Westinghouse Electric Corporation
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