| 摘要 |
PROBLEM TO BE SOLVED: To provide an opening promotion lock capable of eliminating differential pressure (difference in atmospheric pressure) between the inside and the outside of a room without providing a window hole and an opening and closing plate and opening a door being difficult to open due to difference in atmospheric pressure easily without reducing beauty of appearance, airtightness, crime prevention property, and safety. SOLUTION: This opening promotion lock is provided with a latch bolt advancing and retracting from a door opening and closing end 19 on the opposite side to a hoisting origin, an operation shaft making the latch bolt advance and retract, and a strike plate 33 which is provided in a door frame 11 and in which the latch bolt advances to assist opening movement of the door 13 from a condition in which the door 13 is in a closed condition and the latch bolt escapes from the strike plate 33. This lock is provided with a reaction force member 39 provided in the door frame 11, a forcibly opening latch 83 provided to advance and retract from the door opening and closing end 19 and is abutted on the reaction force member 39 by advance movement to pry the door 13 in the direction of opening, and a prizing cam fixed to the operation shaft and makes the forcibly opening latch 83 advance and move by rotation operation of the operation shaft after retracting the latch bolt. COPYRIGHT: (C)2005,JPO&NCIPI
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