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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0491470 (1974-07-23) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 24 인용 특허 : 0 |
A tamper-proof locking system for a standard fire hydrant, one embodiment of which includes a cap assembly that fits over the valve stem of the hydrant and is fastened thereto. The cap assembly cannot be turned to open the valve except by means of a special wrench which is adjustable to securely gri
A tamper-proof lock system for protecting the stem of a fire hydrant or similar apparatus against unauthorized turning thereof, said system comprising: A. a cap assembly mountable on said stem and including a cap housing whose head has a circular array of sloped faces formed thereon, the housing hav
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