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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0201573 (1988-06-01) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 11 인용 특허 : 16 |
This cover support provides a seat and lateral keeper for a manhole cover. A principal feature is a plurality of straight lateral segments that are joined near their ends and have corner spreaders acting in an essentially horizontal direction that is biased with respect to the longitudinal axes of t
An adjustable manhole cover support for emplacing into and raising the grade of an existing manhole cover receiving structure, said cover support comprising a plurality of straight lateral segments joined near their ends for forming a polygonal perimeter, each lateral segment having a base with an e
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