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|국가/구분||United States(US) Patent 등록|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 3 인용 특허 : 0|
A quick opening manhole cover assembly is provided which is suitable for use with virtually any shape manhole cover of a pressure vessel. The assembly broadly includes a manhole cover having outer dimensions which are less than the inner dimensions of the manhole so that the cover can pass freely therethrough. The assembly also includes a structure for raising and lowering the cover into and out of the manhole. A sliding lock mechanism is located above the cover and is engageable to prevent axial movement of the cover. A safety mechanism is provided to p...
A quick opening manhole cover assembly comprising: (a) a manhole; (b) a manhole cover having outer dimensions which are less than the inner dimensions of said manhole in order that said manhole cover may pass freely therethrough; (c) a bridge structure pivotally mounted to said pressure vessel and spanning said manhole; (d) a housing within said bridge structure, which housing is positionable above said manhole, said housing containing a threaded screw secured at one end to the approximate center of said manhole cover, said housing also containing a hand...