Trench box moving apparatus and method

Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention

Reexamination Certificate

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Details

C405S282000, C405S272000, C405S157000

Reexamination Certificate

active

07402003

ABSTRACT:
There is disclosed an apparatus and method for moving with an excavator arm a trench box having a pair of adjacent spreader bars at a forward end. The apparatus has a bracket end for connecting to the excavator arm and a hooking fork. The hooking fork has a first surface that engages the first spreader bar of the trench box. The apparatus also includes a second surface for engaging the adjacent second spreader bar when used to lift the trench box from the trench or move the trench box along the trench floor.

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patent: 4019329 (1977-04-01), Griswold
patent: 4058983 (1977-11-01), Griswold
patent: 4714381 (1987-12-01), Hatch
patent: 5336023 (1994-08-01), Burdine
patent: 5533838 (1996-07-01), Kundel
patent: 5669738 (1997-09-01), Kundel
patent: 5735642 (1998-04-01), Barringer
patent: 5931608 (1999-08-01), Wilkinson
patent: 6007271 (1999-12-01), Cole et al.
patent: 6443665 (2002-09-01), Kundel, Sr.
patent: 6808360 (2004-10-01), Patterson

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