| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a chair in which it is not necessary to release the lock in a raised state of a back frame by a manual operation.SOLUTION: A chair includes a body part 5 having a pedestal 2, a back frame 8 that can be raised and lowered with respect to the body part 5, a seat frame 10 connected to the back frame 8 in a vertically rotatable manner. In a state that the back frame 8 is raised, and a load of a seating occupant is not applied to the seat frame 10, the raised state of the back frame 8 is locked, and when a predetermined load or more of the seating occupant is applied to the seat frame 10, the lock is released.</p> |
