| 摘要 |
<p>A sofa provided with an armrest portion (49), connected to a sofa fixation portion (45) with an angle-adjustable hinge (3) and freely angle-adjusted, and switched between a locked state in which the armrest portion (49) is oscillatable to a standing direction (A) and oscillation in an inclining direction (B) of the armrest portion (49) is restricted, and a free state in which the oscillation in the inclining direction (B) is made possible by nullifying the restriction with a standing lock-releasing posture (To) of the armrest portion (49). The posture of the armrest portion (49) in a random middle inclination posture (T 1 ) in the free state, on way of oscillation in the inclining direction (B) from the lock-releasing posture (To) to a lowest laid posture (T 2 ) for recovering the lock, is kept by recovering the locked state with a return action (M 2 ) of a predetermined small angle (¸) in the standing direction (A).</p> |
