| 摘要 |
PURPOSE:To make it possible to release sheet back lock and sheet bottom lock at a time by providing a coupling member for releasing the sheet back lock while interlocking with the rotary operation of the sheet bottom. CONSTITUTION:A lock piece 9 engaging with a striker 8 is provided below the lower surface of the sheet bottom 2, and a hook 20 engaging with the lock pin 11 of the sheet back 1 on a upper bracket 3. A slider block 27 is provided on the lower surface of the sheet bottom 2, and the lower part of the hook 20 energized by a spring 26 and a slider 28 energized by a spring 29 are connected via a cable 22, allowing the actuation force of the spring 29 to be larger than that of the spring 26. Hereby, the hook piece 9 is disengaged from the stiker 8, and when the sheet bottom 2 is lifted, the hook 20 is pulled via the cable 22 by the energizing force of the spring 29, and the engagement for the lock pin 11 is re4eased, enabling the sheet back 1 to fall down forward. |
