Power shovel with variable pitch braces

Details Power shovel with variable pitch braces Power shovel with variable pitch braces

1994-10-17

1996-03-19

Nicholson, Eric K.

Excavating

Cable-operated

Scoop or bucket

37445, 414726, E02F 381

Patent

active

054994632

ABSTRACT:
A power shovel comprising a frame, a dipper handle mounted on the frame for pivotal movement relative thereto about a generally horizontal dipper handle axis such that the dipper handle has a variable pivotal position relative to the frame, a dipper connected to the handle for pivotal movement relative thereto about a generally horizontal dipper axis such that the dipper has a variable pivotal position relative to the handle, and a variable pitch brace connected between the handle and the dipper at a point spaced from the dipper axis, the variable pitch brace including a spring biasing the dipper in one rotational direction relative to the handle and about the dipper axis, such that the pivotal position of the dipper automatically varies depending on the pivotal position of the handle and on external forces on the dipper.

REFERENCES:
patent: 3278057 (1966-10-01), Drollinger et al.
patent: 3867750 (1975-02-01), Den Bleyker
patent: 3881612 (1975-05-01), Wells
patent: 3933260 (1976-01-01), Kronlokken et al.
patent: 4178030 (1979-12-01), Dolinsek
patent: 5251389 (1993-10-01), Bessey

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