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US 4,067,610 AGranted
Chair control mechanism
AssigneeHoover Ball and Bearing Company
InventorsWendel P. Doerr, William C. Rodgers
Life of this patent
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AssigneeHoover Ball and Bearing Company
InventorsWendel P. Doerr, William C. Rodgers
Estimating the term…
A control mechanism for a chair having two components which are pivotally movable relative to each other wherein one of the components is the chair seat. The other chair component, in one form of chair such as an office chair, is the seat back. In another form of chair, such as a swivel rocker, the other component is the chair base. The control mechanism includes a torsion bar which has a main body portion that extends front to rear of the seat member, and end portions, one of which is attached to the seat member and the other one of which is attached to the other chair component. During relative pivotal movement of the two pivotally connected chair components, the torsion bar acts as a spring to yieldably resist the pivotal movement and return the chair components to their original positions when the load is removed.
A control mechanism for a chair having two components which are pivotally movable relative to each other and wherein one of said components is a seat member having a rear end and a front end, said control mechanism comprising a first frame member mounted on one of said components, a second frame member pivotally connected to the first frame member and mounted on the other component, said frame members being connected for relative privotal movement about an axis, a torsion bar having a main body portion and end portions which are bent transversly of said body portion, said torsion bar being mounted on said frame members so that said body portion extends in a direction substantially perpendicular to said axis and front to rear relative to said seat member, said torsion bar end portions being engaged with said frame members such that on relative pivotal movement of said frame members in one direction of said end portions is moved in a direction tending to rotate said torsion bar body portion in one direction, the other one of said torsion bar end portions being engaged with one of said frame members so as to prevent said rotation and thus cause said torsion bar to twist between said end portions and thereby yieldably resist said relative pivotal movement of said frame members in said one direction and exert forces on said frame members urging said frame members in opposite relative directions.
In a chair having two components one of which is a seat provided with a rear end and a front end, said components being pivotally movable relative to each other about an axis extending transversly of said seat, a torsion bar having a main body portion and end portions which are bent at substantially right angles relative to said body portion, means mounting said torsion bar on said components so that said body portion extends in a direction front to rear relative to said seat, said end portions being operatively associated with said components such that on pivotal movement of one component in one direction relative to the other component, one of said end portions will be moved in a direction tending to rotate said torsion bar body portion in one direction, said other end portion being engageable with the other one of said components to prevent said rotation and thus cause said torsion bar to twist between said end portions and thereby yieldably resist said pivotal movement of said one component in said direction and exert a force on said one component urging said one component in an opposite direction.
A control mechanism for a chair comprising first and second frame members pivotally connected together for relative pivotal movement about an axis, a torsion bar having a main body portion and end portions which are bent transversly of said body portion, said torsion bar being mounted on said frame members so that said body portion extends in a direction substantially perpendicular to said axis, said torsion bar end portions being engaged with said frame members such that on pivotal movement of said first frame member in one direction relative to said second frame member one of said torsion bar end portions is moved in a direction tending to rotate said torsion bar body portion in one direction, the other one of said torsion bar end portions being engaged with said second frame member so as to prevent said rotation and thus cause said torsion bar to twist between said end portions and thereby yieldably resist said pivotal movement of said first frame member in said one direction.
Dependencies are inferred from the claim text.