Excavating – Snow or ice removing or grooming by portable device – Railway clearer
Patent
1988-12-16
1990-03-20
Reese, Randolph A.
Excavating
Snow or ice removing or grooming by portable device
Railway clearer
37 94, 37 96, 37191R, E02F 314
Patent
active
049089676
ABSTRACT:
A heavy duty, chassis-mounted rock trencher for use with a conventional tractor for digging a trench, which obviates the use of outboard counterweights typically used to prevent overcentering problems. The trencher comprises an elongated digger boom selectively pivotally deployable between an inclined digging position and a roughly horizontal transport position. Additionally, the boom may be selectively contracted or extended to transfer weight overcenter and enhance stability. The boom comprises a rigid steel arm entrained by a continuous ground-engaging track of conventional digger elements journalled for rotation about cooperating sprockets upon a headshaft driven by a conventional hydraulic motor. The boom is operationally secured within a rigid, hollow, generally rectangular boom control assembly comprising a movable headshaft mounting housing and a cooperating boom mounting carriage. When the boom is contracted, the headshaft housing slides within the carriage. Hydraulic cylinders control extension, contraction, and tilt of the boom relative to the chassis. An elongated follower slot defined within the boom arm slidably receives a rigid boomshaft adapted to control torsional displacement of the boom during extension and contraction. The boom arm terminates in a pair of guide wings adapted to be slidably fitted within channels defined in the headshaft housing to substantially constrain movement of the boom during digging. Interior guide tabs and centering guides further control undesired displacement of the boom.
REFERENCES:
patent: 1806511 (1931-05-01), Vaughn
patent: 2783556 (1957-03-01), Burns et al.
patent: 2981012 (1961-04-01), Meyer
patent: 3965628 (1976-06-01), Loftis
patent: 4043135 (1977-08-01), Hoes et al.
Carver Stephen D.
DeLiguori Franco S.
Reese Randolph A.
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