Socket hinged construction casting assembly

Details Socket hinged construction casting assembly Socket hinged construction casting assembly

2006-08-22

2006-08-22

Hartmann, Gary S. (Department: 3671)

Road structure, process, or apparatus

Pavement

Vault cover-closure

C220S810000, C137S371000, C016S224000

Reexamination Certificate

active

07094000

ABSTRACT:
A joint suitable for construction castings having a frame and a lid or cover, such as manholes, grates, trench drains, hatches and the like, and construction castings incorporating the same. No tools are necessary to separate the joint. An enlarged head located on a cover fits into a socket located on a frame or adjacent lid. To separate the head from the socket, the lid is lifted to a substantially vertical position and turned about ninety degrees. The lid can then be lifted away from the socket. When the joint is used in manhole or hatch assemblies, a latch may be used to hold the cover open and the cover may be opened and closed with a lever.

REFERENCES:
patent: 401560 (1889-04-01), Hotchkiss
patent: 4840514 (1989-06-01), Defrance et al.
patent: 5531541 (1996-07-01), Clover et al.
patent: 5745953 (1998-05-01), Golden
patent: 0 420 777 (1991-04-01), None

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