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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0831565 (1992-02-05) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 16 인용 특허 : 0 |
An access cover plate is secured to a door by tamper-proof fasteners. A hole in the cover plate is concentric with a cylinder lock keyhole and provides access for the key and actuation of the primary lock. The cover plate access hole is closed off by a removable threaded plug which engages female th
A cylinder guard for a door lock, comprising: a frame; a key-actuated lock mounted in the frame, said lock having a face and a keyhole therein; a coverplate affixed to said frame which completely covers the lock, except for a threaded key access aperture which is approximately coaxial with the keyho
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