|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||404/26 ; 52/21 ; 249/11 ; 249/160|
|발명자 / 주소|
|인용정보||피인용 횟수 : 17 인용 특허 : 3|
An adjustable cast iron or ductile iron manhole frame and method of construction utilizing a formed concrete base or a base of brick and cement mortar that supports both the frame and the pavement. The height and angle of the frame are determined by the method of construction which sets the height and angle of the formed concrete base. The frame is further adapted to receive and hold the manhole cover, and the frame includes an arched section to hold it securely to the concrete base or to filler material when in a raised position.
A frame disposable in surmounting relation to a manhole cone to define a manhole opening at pavement level, the opening being closable by a manhole cover, the frame further being capable of adjustment relative to the cone and to the pavement level, comprising: a body member having a centrally disposed opening defined at least in part by an inner skirt portion which extends substantially about the periphery of the opening, the body member having a planar upper surface normally disposed horizontally when installed relative to the cone, that portion of the ...