Invention Grant
- Patent Title: Production-optimized manhole cover
- Patent Title (中): 生产优化的人孔盖
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Application No.: US13542772Application Date: 2012-07-06
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Publication No.: US08454263B2Publication Date: 2013-06-04
- Inventor: Thomas Lorenz
- Applicant: Thomas Lorenz
- Applicant Address: DE Wallenhorst
- Assignee: Thomas Lorenz Industrie Technik GmbH/Co. KG
- Current Assignee: Thomas Lorenz Industrie Technik GmbH/Co. KG
- Current Assignee Address: DE Wallenhorst
- Agent Patricia M. Mathers
- Priority: DE102011051611 20110706
- Main IPC: E02D29/14
- IPC: E02D29/14

Abstract:
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 portion of the handle is curved upward and is held in the recess such that there is a space between the curved portion and the bottom of the recess, so that the handle may be easily grasped.
Public/Granted literature
- US20130011194A1 MANHOLE COVER OPTIMIZED FOR MANUFACTURING Public/Granted day:2013-01-10
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