Motor vehicles – Special driving device – Spiral type element
Patent
1977-05-26
1978-07-25
Barefoot, Galen L.
Motor vehicles
Special driving device
Spiral type element
152352R, 244 50, 244103R, 301 41R, 305 34, B62D 5700
Patent
active
041024230
ABSTRACT:
A ground traction device is disclosed which comprises ground engaging members including first and second parts, the parts being mounted for rotation on a fixed axis and being rotationally offset with respect to each other about the axis. The peripheral surface of each part includes three individual areas arranged in the form of an equilateral triangle with ends of adjacent areas being joined by lobe portions. The ground engaging portions are constructed of molded rubber and provide improved traction in soft ground. The properties of the rubber are selected in relation to the weight of a vehicle to be moved so that the ground engaging member rotates about a true rolling radius over hard ground.
REFERENCES:
patent: 2256570 (1941-09-01), Kopczynski
patent: 2460387 (1949-02-01), Hunter
patent: 2500577 (1950-03-01), Sands, Jr.
patent: 2692096 (1954-10-01), Pierce
patent: 2711221 (1955-06-01), Kopczynski
patent: 2790503 (1957-04-01), Kopczynski
patent: 2819767 (1958-01-01), Kopczynski
patent: 3279722 (1966-10-01), Glover, Jr. et al.
patent: 3372766 (1968-03-01), Liffertl
Barefoot Galen L.
Westland Aircraft Limited
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