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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0482830 (2009-06-11) |
등록번호 | US7891904 (2011-02-08) |
발명자 / 주소 |
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대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 17 인용 특허 : 6 |
A stop mechanism advantageously combined with a manhole cover includes a holder body having a passage which slidably receives a stop member able to be cammed in and out upon advance or retraction of a threaded drive member having an enlarged tip engaged with a down sloping channel formed in the stop
The invention claimed is: 1. A mechanism for preventing a cover received in an opening in a surrounding structure from being completely removed from said surrounding structure, comprising:a holder body attached to an underside of said cover;said holder body formed with a passage extending into said
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