Motor vehicles – Special driving device – Portable track
Patent
1979-02-23
1981-03-03
Pekar, John A.
Motor vehicles
Special driving device
Portable track
280492, 298 20R, 298 22J, B60D 700, B60P 104, B60P 116, B62D 5506
Patent
active
042535360
ABSTRACT:
An articulated, cross-country motor vehicle, especially for forestry work and the transportation of timber, comprising front and back pairs of bogies with belts, pivotally attached to the frame of the vehicle by means of transverse axles or shaft journals. The bogies are independently and/or mutually pivotable and adjustable relative to one another in the vertical plane by means of hydraulic pivoting members controlled from the driver's seat of the vehicle. The vehicle consists of a forward, endless tread vehicle and a trailer provided with a hitch. The two components are releasably coupled together and arranged so as to be mutually universally pivotable relative to one another. The hitch has a lockable joint near the endless tread and a lockable joint at a distance removed from the first mentioned joint, both having horizontal axis of rotation, and adapted in the locked state to keep the hitch rigid and straight and in the unlocked state, to permit the hitch to be bent upwards with the help of suitable tipping means, in order thereby to tip the frame of the trailer backwards about a common axis of pivot for the frame and the rear pair of bogies.
REFERENCES:
patent: 2665144 (1954-01-01), Birdwell
patent: 3658104 (1972-04-01), Hamilton
patent: 4036321 (1977-07-01), Habiger
patent: 4072203 (1978-02-01), Pierson
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