Pressure balanced torsion system for a backrest and the like
OwnerYun H. Zhanginventor
Life of this patent
Estimating the term…
Abstract
The pressure balanced torsion system is for use in a backrest and the like. The system has a plurality of torsion action assemblies. Each assembly consists of a pair of pressure bearing plates mounted at the free ends of a torsion spring. The torsion spring is pivotally mounted to a rigid support plate which forms the back plate of the backrest. When a body rests against the backrest, the counter reactive force generated by the assembly causes both pressure bearing plates to push back against the body until the torsion is balanced, thus providing a uniform support to the body.
Claims9
A pressure balanced torsion system for use in a backrest and the like, comprising
- a first pressure bearing plate means and a second pressure bearing plate means, each of said first pressure bearing plate means and second pressure bearing plate means having a front surface and a rear surface opposite to said front surface,
- an elongated torsion spring means including a first arm portion having a free end mounted to said rear surface of said first pressure bearing plate means, and a second end mounted to one side of a rocker member, said torsion spring means including a second arm portion having a free end mounted to said rear surface of said second pressure bearing plate means, and a second end mounted to a second side of said rocker member, said second side of said rocker member being directly located opposite to said one side,
- said rocker member being pivotally mounted on a support plate.
A pressure balanced torsion system for use in a backrest and the like, comprising
- a plurality of torsion balanced means located between a flexible retaining sheet means and a rigid support plate,
- each of said torsion balanced means including a first pressure bearing plate means and a second pressure bearing plate means, each of said first pressure bearing plate means and second pressure bearing plate means having a front surface and a rear surface located behind said front surface, an elongated torsion spring means including a first arm portion having a free end mounted to said rear surface of said first pressure bearing plate means, and a second end mounted to one side of a rocker member, said torsion spring means including a second end mounted to a second side of said rocker member, said second side of said rocker member being directly located opposite to said one side, and said rocker member being pivotally mounted on said rigid support plate.
Dependencies are inferred from the claim text.