| 摘要 |
PROBLEM TO BE SOLVED: To achieve full security by locking one door with two locks if a door chain is locked even while there is no one inside and provide a structure impeding search for keyhole shape and a laborsaving construction means to avoid a step between a sub-box attached to the door and a main box on a column. SOLUTION: The main box 2 having a slide groove 4 is secured to the face of an open side column P. When a slider S with a chain C inserted is locked and this locking is released by the press of push buttons 16, 23 (for inside and outside use), the slider automatically slides into a fall groove 5 in the adjacent sub-box 1, tilts a stop piece 7 as it drops, and stops on abutting a stop rack 8 below it, so the slider S and the chain C achieve locking to the column and the door. The door is unlocked from the inside by pulling a flanged pull bar 39 directly connected to the rack 8, and from the outside by turning a pinion with a key 70 to move the rack 8. A threaded shaft 26 of a baseplate 24 attached to the door D is aligned with the extension of the column P face and fixed and the box 1 is engaged. A peripheral side is fixed with an enclosing plate 29 to give strength. An end opening of the groove 5 and an end face of the groove 4 are accurately aligned coplanar with the box 2. A special lock where a rib is provided in a key path, with a key grooved to conceal a keyhole, may also be mounted inside. COPYRIGHT: (C)2004,JPO
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