Excavating – Snow or ice removing or grooming by portable device – Railway clearer
Patent
1980-08-18
1982-05-18
Eickholt, E. H.
Excavating
Snow or ice removing or grooming by portable device
Railway clearer
212175, 212253, 308227, 414570, 414643, 414648, E02F 348, E02F 332
Patent
active
043297951
ABSTRACT:
A walking dragline excavator massive hollow internally reinforced base frame has built-in annular rail girder means over which annular track means are carried for running thereon of roller means adapted for supporting the revolving frame on the annular track means. Load stress distribution between the base frame and the revolving frame is attained by having an annular area contiguous to the perimeter of the base frame of greater resilient flexibility than the remainder of the base frame. Means comprising either bolts or clips are provided for releasably connecting the track means to the base frame and for permitting load stress relief circumferentially directed relative movement of the track means and the base frame under load transmitted through roller means by the revolving frame during load lifting and operational revolving of the revolving frame.
REFERENCES:
patent: 1635689 (1927-07-01), Rauch
patent: 2049653 (1936-08-01), Ljungkull
patent: 2068555 (1937-01-01), Ljungkull
patent: 2408378 (1946-10-01), Davenport et al.
patent: 3888357 (1975-06-01), Bauer et al.
patent: 4037894 (1977-07-01), Sankey
patent: 4038765 (1977-08-01), Sankey et al.
patent: 4231699 (1980-11-01), Thompson
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