| 摘要 |
PROBLEM TO BE SOLVED: To increase the position adjusting amount of a dead bolt when the dead bolt is charged. SOLUTION: A holder 5 guided movably in the longitudinal direction perpendicular to a strike plate 2 and energized in a direction to approach the strike plate is installed in a mortar guard 3 of the strike fitted to a door frame. A pair of inner rolling elements 8, 8 having vertical rotating shafts are disposed in the holder 5, and the interval of these inner rolling elements 8, 8 is determined so that the dead bolt 11 can be horizontally loosely moved between these inner rolling elements. Whereas, chamfered parts 13 are formed at both end corner parts of the dead bolt charged into a strike hole in horizontal projection, a pair of outer rolling elements 14, 14 having vertical rotating shafts are disposed at both end edge parts of the strike hole, and the interval of these pair of outer rolling elements is set larger than the interval of the inner rolling elements. COPYRIGHT: (C)2007,JPO&INPIT
|
