Chair seat back height adjustment mechanism
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 11, 1995
Grant Date -
N/A
app pub date -
Aug 9, 1993
filing date -
Aug 9, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved seat back height adjustment mechanism for a chair is disclosed. The improved height adjustment mechanism includes a U-shaped mounting bracket having a back wall and two side walls. A longitudinal shaft having a handwheel is rotatably mounted in the bracket between the side walls and spaced from the back wall. A seat back support arm is insertable through the bracket between the shaft and the bracket back wall. A back plate provided with a rack and an adjacent planar surface both extending along the length of the back plate is mounted onto the seat back support arm. In one aspect, the shaft is provided with a pinion for engaging the rack and a multi-sided, symmetrical cam adjacent the pinion for locking the shaft against free rotation. When assembled, the rack and the planar surface of the back plate are aligned with the pinion and cam respectively. When the shaft is rotated via the handwheel, the pinion rotates and engages the rack thereby causing the seat back support arm to be vertically displaced with respect to the mounting bracket. When a planar face of the cam is contiguous with the planar surface of the back plate shaft rotation is resisted thereby locking the height adjustment mechanism.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully