Locks – Portable
Patent
1978-10-02
1980-02-05
Wolfe, Robert L.
Locks
Portable
70 34, B60R 2500, E05B 2736
Patent
active
041865758
ABSTRACT:
A lock apparatus comprising two parts which are secured together through the ring of a trailer hitch tongue to prevent the unauthorized use of the trailer. The two parts comprise mating first male and first female cylinders attached to first and second circular plates respectively, and a second male member externally threaded cylinder, mounted co-axially within the first female cylinder also attached to the second plate. The interior of the first male cylinder is threaded to provide a second female threaded surface to mate with the second threaded male cylinder. The first unthreaded female cylinder attached to the second plate has a number of slots parallel to its axis about its periphery. A pivotable bar is mounted flush within a slot in the outer surface of the first male internally threaded cylinder. The bar can be rotated by a cam attached to a conventional key operated cylinder lock, to positions within the slot or extending outwardly therefrom. The two parts are secured together through the ring by engaging and tightening the threads with the bar retracted, until the first and second plates engage the ring whereupon the key is used to operate the cam to extend the bar outwardly, in this position the bar can engage one of the slots in the first unthreaded female cylinder thereby locking the two parts in place.
REFERENCES:
patent: 1468027 (1923-09-01), Lindberg
patent: 3844143 (1974-10-01), Hudson
Jacobson Donald A.
Wolfe Robert L.
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