Motor vehicles – Special driving device – Portable track
Patent
1978-12-12
1980-10-28
Pekar, John A.
Motor vehicles
Special driving device
Portable track
172669, 180 95, B62D 5506
Patent
active
042301998
ABSTRACT:
A work vehicle (10) such as, for example, a tractor (74) or loader (27) has a center of gravity (12), a body (14) and first and second continuous track assemblies ( 18,20). In the use of the tractor (74), for example, forwardly locating the center of gravity (12) can increase penetration of a bulldozer (76) on the tractor (74) during bulldozing operations. During ripping operations, penetration of a ripper (78) on the tractor (74) can be increased by rearwardly locating the center of gravity (12). Apparatus (22) is provided for controllably moving the body (14) relative to both of the track assemblies ( 18,20). Said apparatus (22) thus controllably shifts the center of gravity (12) of the tractor (74) relative to both of said track assemblies ( 18,20) for selectively increasing penetration of the ripper (78) or bulldozer (76) depending upon the operation being performed by said tractor (74).
REFERENCES:
patent: 2113997 (1938-04-01), Starr
patent: 2821795 (1958-02-01), Williams
patent: 3185316 (1965-05-01), Bennett
patent: 3204714 (1965-09-01), Gray
patent: 3567049 (1971-03-01), Guinot
patent: 4018295 (1977-04-01), Hasselbacher
patent: 4071277 (1978-01-01), Stedman
Caterpillar Tractor Co.
Heming William B.
Pekar John A.
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