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특허 상세정보

Hydraulically adjustable manhole ring

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) E02D-029/14   
미국특허분류(USC) 404/026; 404/025
출원번호 US-0259265 (2002-09-28)
발명자 / 주소
대리인 / 주소
    Michael Best & Friedrich LLP
인용정보 피인용 횟수 : 14  인용 특허 : 57
초록

A hydraulically adjustable manhole ring including upper and lower rings formed to provide a channel there between. The channel is sealed by in inner flexible membrane coupled between the inner circumferences of the upper and lower rings and an outer flexible membrane coupled between the outer circumferences of the upper and lower rings. A flowable setting agent is injected into the channel causing the upper ring to move relative to the lower ring.

대표
청구항

1. A manhole ring comprising: an upper ring having an outer circumference and an inner circumference, a lower ring having an outer circumference and an inner circumference, an outer flexible membrane having a first end coupled to the outer circumference of the upper ring and a second end coupled to the outer circumference of the lower ring, an inner flexible membrane having a first end coupled to the inner circumference of the upper ring and a second end coupled to the inner circumference of the lower ring, the outer and inner flexible membranes al...

이 특허에 인용된 특허 (57)

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