Apparatus for raising seat of chair
First Claim
1. An apparatus for raising a seat of a chair comprising:
- a pair of spaced arms each having an L-shaped cross-section form including a vertical portion, said arms being adapted to receive a pivotally mounted seat therebetween,a stationary shaft extending between said arms,a position determining sleeve turnably mounted on said stationary shaft, said position determining sleeve being composed of a first sleeve portion disposed remote from the vertical portion of one of the arms, a second sleeve portion disposed by the vertical portion of the arm and an intermediate portion located between said first sleeve portion and said second sleeve portion,first spring means fitted onto the first sleeve portion of the position determining sleeve to normally urge the seat in such a direction that the seat is raised up to a neutral nonuse position, one end of said first spring means being engaged to the stationary shaft and the other end of the same being engaged to the position determining sleeve, andsecond spring means fitted on the second sleeve portion of the position determining sleeve to normally urge the seat toward the neutral position in the opposite direction to the first spring means, said second spring means having a lower intensity of resilient force than that of the first spring means, one end of the second spring means being engaged to a part of the first spring means and other end of the same being engaged to a part of the arms.
3 Assignments
0 Petitions
Accused Products
Abstract
An aparatus for raising a seat of a chair includes a pair of arms fixedly secured to both sides of the seat, stationary shaft extending between both legs of the chair, a position determining sleeve turnably mounted on the stationary shaft, a first coil spring fitted onto a larger diameter sleeve portion of the position determining sleeve and a second coil spring fitted onto a smaller diameter sleeve portion of the position determining sleeve. One end of the first coil spring having a higher intensity of resilient force than that of the second coil spring is engaged to the stationary shaft and other end of the same is engaged to the intermediate portion of the position determining sleeve so that the seat is normally urged to turn to the raised neutral position under the effect of resilient force of the first coil spring. One end of the second coil spring is engaged to the other end of the first coil spring and other end of the same is engaged to a part of the arm so that the seat is normally urged to turn to the neutral position in the opposite direction to the first coil spring. The position determining sleeve is formed with an opposed pair of tongues for determining a range of turning movement of the seat while a reference bolt is extended in an area as defined between both the tongues.
11 Citations
6 Claims
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1. An apparatus for raising a seat of a chair comprising:
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a pair of spaced arms each having an L-shaped cross-section form including a vertical portion, said arms being adapted to receive a pivotally mounted seat therebetween, a stationary shaft extending between said arms, a position determining sleeve turnably mounted on said stationary shaft, said position determining sleeve being composed of a first sleeve portion disposed remote from the vertical portion of one of the arms, a second sleeve portion disposed by the vertical portion of the arm and an intermediate portion located between said first sleeve portion and said second sleeve portion, first spring means fitted onto the first sleeve portion of the position determining sleeve to normally urge the seat in such a direction that the seat is raised up to a neutral nonuse position, one end of said first spring means being engaged to the stationary shaft and the other end of the same being engaged to the position determining sleeve, and second spring means fitted on the second sleeve portion of the position determining sleeve to normally urge the seat toward the neutral position in the opposite direction to the first spring means, said second spring means having a lower intensity of resilient force than that of the first spring means, one end of the second spring means being engaged to a part of the first spring means and other end of the same being engaged to a part of the arms. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification