| 摘要 |
A coupling arrangement includes an inverted u-shaped frame having opposite legs joined by a transverse bight portion. The lower draft links of a tractor three-point hitch are connected to lower ends of the legs of the frame for pivoting about a horizontal transverse axis. Located centrally between the frame legs along the bight portion of the frame is an angle member having a horizontal limb defining a first link and being joined to a vertical limb defined in part by an upwardly projecting bearing axle. An implement draft tongue includes a forward extension to which upwardly and downwardly projecting bearing axles are fixed along a vertical axis. The coupling arrangement includes a second link spaced vertically above the first link and having ball joints in its opposite ends respectively mounted to the bearing axle of the angle member and the upwardly projecting bearing axle of the draft tongue. A ball joint is mounted in the first link and is received on the downwardly projecting bearing axle of the draft tongue. Accordingly, the first and second links and the ball joints they carry act to transfer tensile and compressive loads between, and permit universal movement between, the implement and the tractor.
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