| 摘要 |
PURPOSE:To smoothly rotate an upper hook by disposing two upper and lower hooks, connecting them by means of a connecting plate and setting the mounting position of a spring for actuating the upper hook downwardly at a substantially intermediate point between the rotary shaft and the connecting portion of the connecting plate. CONSTITUTION:Into a hook mounting member 11 fixedly mounted on the rear surface side of a door plate 2 is inserted a hool 15 until a rotary shaft 16 reaches along a guide groove 12 up to the lower end portion thereof. Then, projections 19 for connecting the upper and lower hooks 15 and 15 to each other are engaged with connecting holes 21 of connecting plates 20 to connect the upper and lower hooks 15 and 15. Simultaneously, springs 18 and 18 are suspended between spring engaging holes 17 and spring engaging portions 14. In this case, the spring engaging hole 17 of the upper hook is formed at a position corresponding to a substantially middle point between the rotary shaft 16 and the connecting projection 19. As a result, since the operational lines of forces of an upward force F1 and a spring actuating force F2 are different from each other, a rotational moment is produced, and the upper hook can be rotated smoothly. |
