Excavating – Snow or ice removing or grooming by portable device – Railway clearer
Patent
1974-08-05
1976-04-27
Pellegrino, Stephen C.
Excavating
Snow or ice removing or grooming by portable device
Railway clearer
91411R, E02F 500
Patent
active
039524329
ABSTRACT:
A motor scraper has a dozer-type ejector blade which is forwardly movable to eject earth from the scraper bowl by an operating mechanism which includes a movable carriage having three hydraulic rams mounted thereon. The ram cylinders are rigidly connected in parallel physical arrangement on the carriage. The piston rods of two rams are pinned to the ejector blade and the rod of the remaining ram is pinned to the scraper frame. The blade and carriage are initially disposed in their rearward positions. To move the blade forward to eject earth from the bowl, pressurized hydraulic fluid is supplied simultaneously to all ram cylinders to initially cause the said two rams to extend fully and move the blade part way forward (while the said one ram causes the carriage to remain stationary) and to then subsequently cause the said one ram to extend fully and move the carriage forward and thereby cause the blade to move all the way forward. The initial forward blade movement (which occurs while the bowl is full) is carried out with high force at low speed, whereas the subsequent forward blade movement (which occurs after the bowl is partially emptied) is carried out with lower force but at higher speed.
REFERENCES:
patent: 2353120 (1944-07-01), Austin
patent: 2554930 (1951-05-01), Ulinski
patent: 2886197 (1959-05-01), Harris
Brown Robert A.
Fiat-Allis Construction Machinery, Inc.
Kirby Thomas F.
Pellegrino Stephen C.
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