| 摘要 |
A combination bolt type and chain lock having an L-shaped frame with an edge part forming a strike plate and extending flatwise along and secured to a door jamb edge surface with a frame side part extending flatwise longitudinally along a door jamb side surface. A bolt opening is formed longitudinally through the juncture between the frame edge and side parts and the frame side part has longitudinally spaced overlying portions, with spaced protuberances acting as guide means for a sheetlike lock bolt, and is separated by intermediate underlying portions longitudinally slidably mounting the lock bolt movable through the frame bolt opening. The lock bolt is provided with spaced protuberances to act as abutment stops for the full open and locked positions thereof. Additional locking means is provided by the combination of a hasp secured to the overlying portions of said frame with a length of chain links sufficient in length to be looped around a doorknob of the door when in the closed position. With the swinging door in the closed position, the lock bolt may be extended overlapping the door side surface acting as a bolt lock, the strike plate of the lock frame edge part may be engaged by a main lock bolt extending from the door edge and the loop of secured chain positioned around the doorknob as an additional locking feature. Disengagement of the bolt lock allows partial opening of the door to the extent of the chain loop.
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