| 摘要 |
A trailer hitch for attaching the forward end of a trailer to the rear end of a vehicle comprising a hitch pin support attachable to the forward end of the trailer and being provided with a downwardly projecting cylindrical hitch pin having a circular metallic disk attached to the lower end thereof, the circular metallic disk having an outer diameter larger than the outer diameter of the hitch pin; a base plate attachable to the rear end of the towing vehicle; a yoke portion having its lower end pivotally connected to the base plate for pivotal movement along a horizontal axis; a yoke plate mounted on the upper end of the yoke portion, the yoke plate having a forward flat portion and a pair of rearwardly and downwardly extending fingers, an elongated horizontal opening being provided between the two fingers and extending part way into the flat portion of the yoke plate where the opening terminates in a semicircle of slightly larger diameter than that of the hitch pin, the rear end of the horizontal opening between the fingers being tapered divergently outwardly; a yoke block slideably mounted in the yoke portion, the yoke block being provided with a U-shaped opening which is slightly larger than the diameter of the hitch pin, a first spring mounted in the yoke portion for urging the yoke block longitudinally rearward; a plunger slideably mounted within the yoke portion, a second spring mounted within the yoke portion for urging the plunger transversely towards the yoke block; the yoke block having a rear portion which is disposed in the path of movement of the plunger by the action of the first spring when the plunger is fully retracted against the action of the second spring; the plunger being adapted to move transversely under the action of the second spring beyond and behind the U-shaped opening in the yoke block when the yoke block is moved forwardly against the action of the first spring to move the rear portion thereof out of the path of movement of the plunger.
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