| 摘要 |
PURPOSE: To replace a gas pressure spring body easily by drawing almost the gas pressure spring body out and performing locking in an arm position that the spring effect is in the distorted position. CONSTITUTION: When a gas pressure spring body 14 is almost drawn out and an arm member 3 moves relative to a pillar member 2 to an angular position to make the spring effect be in a distorted relaxation position, two holes 19, 20 are superposed with each other. In order to replace the gas pressure spring body 14, the arm member 3 is rocked to the superposed position of the two holes 19, 20. Next, a support arm locking member 21 on a bolt is mounted to the superposed holes 19, 20, whereby the arm member 3 and the pillar member 2 are restrained in the angular position, i.e., are locked with each other in the state of secure engagement. |
