Static structures (e.g. – buildings) – With entrance for persons or objects in horizontal or... – With additional enclosure structure; e.g. – manhole
Patent
1977-01-17
1978-05-23
Purser, Ernest R.
Static structures (e.g., buildings)
With entrance for persons or objects in horizontal or...
With additional enclosure structure; e.g., manhole
523091, 404 25, E02D 2914
Patent
active
RE0296368
ABSTRACT:
A preformed manhole suitable for use underground is made of reinforced plastic. The manhole comprises a dome section integrally joined at one end of a tubular body by an endless band of reinforced plastic. The dome is arcuately shaped to provide resistance to buckling, and in one specific embodiment is generally hemispherical. The dome includes a manway and a load bearing shoulder for supporting the manhole cover and frame. An upwardly extending rib or collar is provided around the manway to provide additional stiffness and stability.
The method for making the preformed manhole is also disclosed. The tubular body is made by applying resin, glass fiber reinforcement, and particulate filler on an endlessly advancing mandrel. The dome is made by applying resin and glass fibers on the surface of a rotating mold. The dome and body are joined by laying-up resin and glass over their mated ends.
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patent: 3097166 (1963-07-01), Monson
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patent: 3235289 (1966-02-01), Jones
patent: 3360147 (1967-12-01), Schaefer
patent: 3672103 (1972-06-01), Kost
patent: 3715958 (1973-02-01), Crawford
patent: 3850801 (1974-11-01), Pearson
Hudgens Ronald C.
Owens-Corning Fiberglas Corporation
Pacella Patrick P.
Purser Ernest R.
Raduazo Henry
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