| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in a chair having a conventional tilt mechanism that a large force is required to largely tilt a backrest backward, namely the backrest can be largely tilted backward only by not only applying the body weight but also using the muscles, or a petite person or light women cannot take a satisfactorily backward tilted stance. SOLUTION: In this chair having a structure for compressing a coil spring in the backward titling of a backrest arm, the direction of compressing the coil spring is gradually changed relatively to the tangential direction of the rotation of the part receiving the action of the spring force on the backrest arm according to the backward tilting of the backrest arm. According to such a structure, since the coil spring is compressed to increase the total reaction of the coil spring according to the backward tilting of the backrest arm, while the direction of the total reaction of the coil spring is gradually shifted to the rotating direction of the backrest arm, the degree of compression of the coil spring and the shifting manner in the backward tilting of the backrest arm are set, whereby the magnitude of the effective component of the reaction of returning the backrest arm to a raised attitude of the coil spring can be properly controlled. COPYRIGHT: (C)2003,JPO
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