Excavating – Snow or ice removing or grooming by portable device – Railway clearer
Patent
1974-10-23
1977-08-02
Crowder, Clifford D.
Excavating
Snow or ice removing or grooming by portable device
Railway clearer
212 38, 212 49, 212 59R, 212 69, 212144, E02F 348, E02F 914, B66C 2362
Patent
active
040387658
ABSTRACT:
An improved boom support for a walking dragline excavator having a roller circle, a frame mounted on the roller circle for swing movement about the axis of the roller circle, a boom having a pair of boom feet connected to a front end of the frame and proximate to a segment of the roller circle, a hoist line connected to hoist machinery on the frame and passing over a point on the boom, a bucket connected to the hoist line, a dragline interconnecting the bucket and drag machinery on the frame, the front end of the frame having insufficient stiffness for adequately resisting deflection and substantially uniformly distributing the boom weight and hoist load imposed thereon over a segment of the roller circle disposed beneath the front end of the frame, the boom support including an upright structure having an upper end and a pair of legs connected to the frame, the upper end of the upright structure being connected to the pendants and to the frame rearwardly of the leg connections, the leg connections of the upright structure being disposed intermediate the boom feet connections, proximate to a segment of the roller circle, and spaced arcuately from the boom feet connections, the leg connections of the upright structure being separate from and independent of the boom feet connections.
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Barden Kenneth L.
Ruch Paul
Sankey Edwin W.
Bratlie Steven A.
Crowder Clifford D.
Marion Power Shovel Company, Inc.
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