Railways: surface track – Electrical connections – Combined rail joint or support
Patent
1979-08-31
1981-04-14
Reese, Randolph A.
Railways: surface track
Electrical connections
Combined rail joint or support
E01B 2300
Patent
active
042615100
ABSTRACT:
A device is disclosed for improving the traction of vehicle wheels, particularly for use with an automotive vehicle rendered immobile in snow or sand. A plate is provided with transverse T-shaped gripping members affixed to the plate on each surface for the entire width of the plate. Accordingly, positive traction is provided to both the vehicle wheel and the soft or slippery material, such as snow, sand, mud, or ice in which the wheel has become embedded. The invention is easily handled and used, particularly in emergency situations, and is durable under repeated conditions of hard use. Each T-shaped transverse bar constituting the gripping means is mounted preferably at an angle of about 25.degree. for presenting a positive gripping surface to enable the wheel to travel along the length of the traction device. Furthermore, the transverse bars provide rigidity to the device and are constructed to avoid damage to the tire. The device can be made of any suitable material, such as a lightweight aluminum alloy, high strength molded plastic, and like materials or combinations of materials.
REFERENCES:
patent: 1193139 (1916-08-01), Harden
patent: 1324291 (1919-12-01), Austen
patent: 3025002 (1962-03-01), Kunz
patent: 3096939 (1963-07-01), Kalfen
patent: 3289939 (1966-12-01), Martinov
patent: 3701474 (1972-10-01), Welz
patent: 3998981 (1976-12-01), Burkhardt et al.
patent: 4159731 (1979-07-01), Dyrdahl
Jacobson Harvey B.
Reese Randolph A.
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