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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||49/465 ; 49/395 ; 49/400 ; 404/25|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 15 인용 특허 : 1|
The hatch cover is secured and locked in place by a spider which is rotatable into locking position against the underside of a deck ring which receives the cover plate. The spider is clamped by a center bolt passing through the cover and the spider. Means are provided on opposite ends of the center bolt for rotating it from either the outside or inside of the cover. The cover is adapted to stow a removable wrench for this purpose recessed in the outside of the cover. A peripheral seal on the cover plate maintains a water tight and air tight joint when th...
A flush deck hatch or manhole construction having a cover with locking and clamping means, said construction comprising a supporting ring of T-shaped cross section having a continuous inwardly directed horizontal flange portion and a vertical portion extending above and below said flange, a cover plate having a peripheral gasket groove in its under side, overlying said flange portion of said supporting ring, said groove being formed by a pair of vertical walls on said cover plate having confronting horizontal flanges on their lower edges to retain a gask...