Motor vehicles – Steering by driving – Endless flexible track
Patent
1979-03-19
1981-02-10
Love, John J.
Motor vehicles
Steering by driving
Endless flexible track
180 658, B62D 1108, B62D 5512
Patent
active
042496250
ABSTRACT:
A drive system for crawler propelled earth working machinery is described. A first clutch which is movable between a drive position for transmitting drive from a drive source to a first drive sprocket and a lock position for locking the first drive sprocket to the frame is provided. A second clutch permits a second drive sprocket to free wheel. The second clutch has a drive position for transmitting drive from the drive source to the second drive sprocket and a lock position for locking the second drive sprocket to the frame. The first drive sprocket is, as well, lockable to the frame. The foregoing locking arrangements are selectively engageable with the first and second drive sprockets. Hydraulically actuatable shifting devices shift the first clutch between drive and lock positions and the second clutch between free wheel, drive and lock positions. A shifting preventing device releasable responsive to engagement of one of the drive sprocket locking devices prevents the second clutch from shifting to the free wheel position.
REFERENCES:
patent: 2281288 (1942-04-01), Hettelsater
patent: 2757746 (1956-08-01), Biedess
patent: 2791918 (1957-05-01), Frellsen
patent: 3171504 (1965-03-01), Noll et al.
patent: 3460645 (1969-08-01), Brown et al.
patent: 3580345 (1971-05-01), Brown et al.
Dresser Industries Inc.
Love John J.
McGiehan Donn
LandOfFree
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