Trench shield

Details Trench shield Trench shield

1996-10-07

1999-02-09

Graysay, Tamara L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405272, E02D 1700

Patent

active

058685260

ABSTRACT:
A trench shield or manhole shield which has tapered side shields. The walls of each side shield are tapered. The outer walls are tapered inwardly from front to rear (in the case of the trench shield) or from top to bottom (in the case of a manhole shield). This taper allows the shield to be pulled out of an excavated hole by reducing friction because the trailing portion of the shield is tapered inwardly and does not contact the sides of the hole. The inner wall of each side shield of the trench shield is tapered outwardly from front to rear, further reducing friction. In different embodiments either the outer or the inner walls or both are tapered.

REFERENCES:
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patent: 3089310 (1963-05-01), Torti
patent: 3715889 (1973-02-01), Bixler et al.
patent: 3782126 (1974-01-01), Pavese
patent: 4019330 (1977-04-01), Griswold
patent: 4033138 (1977-07-01), Griswold
patent: 4752157 (1988-06-01), Ischebeck et al.
patent: 4993880 (1991-02-01), Collins
patent: 5232312 (1993-08-01), Jennings et al.
patent: 5277522 (1994-01-01), Pertz
patent: 5290129 (1994-03-01), Rody et al.
patent: 5310290 (1994-05-01), Spencer
patent: 5503504 (1996-04-01), Hess et al.
patent: 5527137 (1996-06-01), Spencer
Efficiency Production, Inc. Trench Shields, Bedding Containers, Portable Water Systems catalog, 1991.

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