| 摘要 |
A locking device (10) for a trailer and hitch of the ball and socket type, comprising an upper jaw (12) and a lower jaw (11) interconnected together by a shaft (14) for reciprocal movement relative to each other. A locking means (30) keeps the two jaws (11, 12) apart at fixed distances over a ribbed portion (31) of the shaft (14). In use, the two jaws (11, 12) are locked about the socket portion of the hitch to prevent unauthorised removal of the trailer. When the trailer is attached to a tow vehicle, the tow ball nut is received in an opening (36) in the lower jaw (11). When the trailer is unattached, a dummy ball (46) extends into the socket of the hitch. In both positions, the socket portion of the hitch is received in an aperture (34) in the upper jaw (12).
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