Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1985-11-27
1988-09-27
Rolla, Joseph J.
Material or article handling
Vertically swinging load support
Shovel or fork type
414719, 212198, E02F 502
Patent
active
047738146
ABSTRACT:
The earth moving machine has a body having a ground engaging propulsion device and a base frame mounted on the ground engaging propulsion device. The base frame is movable relative to the ground engaging propulsion device about a first generally vertical axis. A boom extends outwardly of the body and is mounted on the base frame for movement about a second axis transverse relative to the first axis. The boom has a dipper arm mounted at an outer end thereof for movement about a third axis also transverse to the vertical axis. An excavating implement is mounted at an outer end of the dipper arm for movement about a fourth axis also transverse relative to the first vertical axis. A hydraulic ram is mounted between the dipper arm and the boom to effect movement of the dipper arm relative to the boom and hence to effect movement of the implement towards and away from the body. A counterweight is mounted on the base frame, and elements are provided for moving the counterweight towards or away from the first vertical axis in response to movement of the dipper arm relative to the boom towards or away from the body.
REFERENCES:
patent: 1718434 (1929-06-01), Ronk
patent: 2526613 (1950-10-01), Tanguy
patent: 2763385 (1956-09-01), Harrison
patent: 3734326 (1973-05-01), Esser
patent: 4403771 (1983-09-01), Kasahara et al.
patent: 4493602 (1985-01-01), Koerber
patent: 4494906 (1985-01-01), Brocklebank et al.
patent: 4600085 (1986-07-01), Gagnon et al.
patent: 4679336 (1987-07-01), Brocklebank et al.
Brocklebank Norman
Cooper Alan
Baker Robert C.
J. C. Bamford Excavators Limited
Pedersen Nils E.
Rolla Joseph J.
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