Trench shoring extraction device

Details Trench shoring extraction device Trench shoring extraction device

2007-10-05

2010-02-09

Lagman, Frederick L (Department: 3672)

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

C405S272000, C254S0930VA

Reexamination Certificate

active

07658573

ABSTRACT:
A hydraulic lifting device including a main beam, two or more connection plates fixedly connected to the main beam, at least two legs, each leg pivotably attached to two of the plates, at least two hydraulic cylinders, each cylinder disposed between the beam and one of the legs, and two or more load connectors.

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