| 摘要 |
A locking device serves to prevent the insertion of a key into a keyhole on a doorknob and for this purpose includes a hasp which straddles the narrowed neck of the doorknob and an outer guard supported by the hasp overlies the keyhole to prevent insertion of a key. A lock member, preferably of the tumbler type, closes the open end of the hasp to keep the guard over the keyhole and prevent its removal from the doorknob and is movable along the hasp to a selected position.
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