|국가/구분||United States(US) Patent 등록|
|우선권정보||DE-10 2011 051 611 (2011-07-06)|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 1 인용 특허 : 10|
A manhole cover is made of a fiberglass reinforced saucer-like shell that is filled with concrete. The interior surface of the shell is rough and the shell has a maximum thickness of 5 mm. An adhesive agent may be provided between the base and the filling, to obtain a reliable bond between base and filling. The concrete for the filling may be pure mineral concrete. One or more lifting handles are embedded in the filling. To this end, a recess for each handle is formed in the filling. The ends of the handle are embedded in the concrete and the lifting por...
1. A manhole cover consisting of: a base constructed of a fiberglass-reinforced, duroplastic material, the base having a roughened interior surface and having a maximum material thickness of 5 mm;a concrete filling that is filled into the base, the concrete filling being a pure mineral concrete and having a lower surface and an upper surface;an adhesive agent between the interior surface of the base and the lower surface of the filling; anda lifting means that includes a recess formed in the concrete filling and a lifting handle having two ends that are ...