Importance

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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.

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First Claim