| 摘要 |
PCT No. PCT/US86/01431 Sec. 371 Date Mar. 27, 1987 Sec. 102(e) Date Mar. 27, 1987 PCT Filed Jul. 9, 1986 PCT Pub. No. WO88/00149 PCT Pub. Date Jan. 14, 1988.A tow vehicle (3) and trailer vehicle (5) are connected by a four-bar hitch which has one arm (1) aligned longitudinally with the central longitudinal axes (12,13) of the vehicles, and a steering arm (6) which is laterally spaced from the main arm. Pivots, (7,8) at the front and rear ends of the steering arm are forwardly offset with respect to the corresponding pivots (2,4') of the main arm. The length of the main arm is no greater then about 1.5 times the length of the steering arm. The rear pivot (8) of the steering arm is offset laterally and forwardly from the rear pivot (4') of the main arm, so that the lateral offset is greater than the forward offset. An embodiment is disclosed wherein the forward pivot on the steering arm is laterally shiftable toward the forward pivot on the main arm to reduce the offtracking of the trailer for certain maneuvering and driving situations. In one embodiment, an upper arm (30) is disposed above and in forwardly convergent relation with respect to the main arm (1) in order to provide a vertical four-bar linkage which allows the tow vehicle to pitch naturally.
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