Land vehicles – Wheeled – Articulated vehicle
Patent
1990-08-27
1992-02-04
Hill, Mitchell J.
Land vehicles
Wheeled
Articulated vehicle
2804161, B62D 106
Patent
active
050854526
ABSTRACT:
A tractor ball assembly to be mounted on the tongue at the rear end of the tractor having a plurality of balls to match the variously-sized sockets commonly used. The ball is mounted on a base which rests on the tractor tongue. Frusto-conical sections of identifical size and shape diamatrically opposed are cut in each ball and the upper side of the base has a surface complementary to the surface of one of the frusto-conical sections. A bolt, the under side of the head of which is a surface complementary to the ball frusto-conical surfaces fits into aligned holes in the ball, base and tongue and upon being tightened keeps the ball from slipping with respect to the base and/or the bolt.
REFERENCES:
patent: 3434741 (1969-03-01), Grant
patent: 4230336 (1980-10-01), Avrea et al.
patent: 4433854 (1984-02-01), Smith
patent: 4662647 (1987-05-01), Calvert
patent: 4938496 (1990-07-01), Thomas et al.
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