Excavating – Peat excavators
Patent
1977-04-05
1978-09-05
Eickholt, E. H.
Excavating
Peat excavators
172188, 172784, 172387, 172199, 280 19, 37 41, E01H 400
Patent
active
041109198
ABSTRACT:
An apparatus and more specifically a drag adapted to form and condition a ski trail, and in particular two generally parallel ski traces as commonly used for cross-country skiing, such that the ski traces are of uniform parallelism and depth and are free of lumps of ice and snow. This drag includes a rear sled unit and a front unit, a pair of runners forming ski traces secured under the sled unit, a pivotal connection joining the two units and allowing only up-and-down sliding and yaw pivoting of the rear unit relative to the front unit. The rear unit includes a sled platform and a pair of runners of particular construction to cooperatively produce ski traces of uniform parallelism and depth. The front unit includes a frame carried by a runner and adjustable height relative to the latter, scrapers pivoted to the frame of the front unit between a downward operative position and an elevated inoperative position.
REFERENCES:
patent: 2948543 (1960-08-01), Collier
patent: 3576214 (1971-04-01), Ratcliffe
patent: 3684031 (1972-08-01), Reynolds
patent: 3739859 (1973-06-01), White
patent: 3795069 (1974-03-01), Cheney
patent: 3815688 (1974-06-01), Brown
patent: 3872931 (1975-03-01), Camp
patent: 3878900 (1975-04-01), Boisse et al.
patent: 3915239 (1975-10-01), Hendrichon
patent: 4014116 (1977-03-01), Baechler
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