Static structures (e.g. – buildings) – With entrance for persons or objects in horizontal or... – With additional enclosure structure; e.g. – manhole
Patent
1996-10-30
2000-04-04
Kent, Christopher T.
Static structures (e.g., buildings)
With entrance for persons or objects in horizontal or...
With additional enclosure structure; e.g., manhole
277608, 404 25, B29C 3300, B29C 6570
Patent
active
060445904
ABSTRACT:
A gate valve box adaptor structure, the present invention provides a permanent support for the key box bonnet that is unaffected by the surrounding environment. The adaptor is supported on the gate valve to a positive location for the key box bonnet at a level which prevents infiltration of soil and moisture into the bonnet. The adaptor is provided with a resilient gasket of a unique design to provide a cushion and to create a seal for the bonnet on the gate valve. A plurality of liquid infiltration prevention structures for preventing liquid infiltration into manhole assemblies.
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