| 摘要 |
PROBLEM TO BE SOLVED: To provide a pull-in device capable of changing pull-in force in the middle of the movement of a sash, in the pull-in device for pulling the sash in the vertical frame side by accumulated energy, when opening-closing the sash such as a sliding door and a sliding sash.SOLUTION: The energy is accumulated when opening a sash 6, and the sash is pulled in by consuming this energy when closing. An energy accumulation device comprises a spiral rod 44 having a screw part 43 and a torsion spring 45. The spiral rod is pulled out of a case 41 when opening the sash, and is pulled in the case when closing the sash. A lead of a screw part of the spiral rod changes from the middle so that the lead of a pull-out starting section band from the case becomes small and a pull-out finish section band becomes large. |
