Semi-trailer truck

Details Semi-trailer truck Semi-trailer truck

1987-08-11

1988-12-20

Mitchell, David M.

Land vehicles

Wheeled

Running gear

280405A, 280704, B62D 1306

Patent

active

047921480

ABSTRACT:
A semi-trailer includes a self-steering rear axle assembly and a stationary axle assembly located at least 10 feet in front of the self-steering axle assembly and at least the minimum distance from the tractor front axle. The wheels on the self-steering axle assembly are carried on king pin assemblies which are movable between forward and reverse positions so that the self-steering axle wheels track the stationary axle wheels during turning in both the forward and reverse directions. The self-steering axle assembly preferably is retractable so the wheels can be raised when not needed. In one embodiment, the tractor has only a front axle and a single drive axle and all axles have a load rating of at least one-fourth of the load rating of the semi-trailer truck unit so that a maximum gross load can be hauled even though the unit has only four axles.

REFERENCES:
patent: 2847228 (1958-08-01), Hall
patent: 3195922 (1965-07-01), Humes
patent: 3880440 (1975-04-01), Tidewall
patent: 4284156 (1981-08-01), Carstensen et al.
patent: 4373738 (1983-02-01), Lange
patent: 4614247 (1986-09-01), Sullivan

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