Locks – Special application – For control and machine elements
Patent
1977-08-18
1979-01-02
Foss, J. Franklin
Locks
Special application
For control and machine elements
70165, E05B 6512
Patent
active
041320930
ABSTRACT:
The coupling pin of the trailer of a tractor-trailer rig is provided with a theft prevention device for preventing the unauthorized coupling of unattended trailers. The device includes a truncated conical housing having a cylindrical sleeve which is secured to the inner base of the cone and is adapted to receive the coupling pin. The coupling pin is held within the sleeve by means of a pair of opposed, spring-biased locking jaws which normally protrude through a pair of opposed slots in the sleeve. In order to engage the reduced diameter portion of the coupling pin. The locking jaws are mounted on a pair of U-brackets. The brackets carry a pair of camming surfaces which are engaged by the wing cams of a key-operated lock. The lock is preferably recessed within the housing so that it cannot be sheared off during use. The invention has the additional utility of serving as a safety device for preventing the movement of a trailer during unloading operations.
REFERENCES:
patent: 1764367 (1930-06-01), Szymanski
patent: 2350633 (1944-06-01), Obenauer
patent: 2554306 (1951-05-01), Mack
patent: 3112636 (1963-12-01), McIntyre
patent: 3386274 (1968-06-01), McIntyre
patent: 3386274 (1968-06-01), McIntyre
patent: 3415085 (1968-12-01), Eble
patent: 3600914 (1971-08-01), Johnson
patent: 3706211 (1972-12-01), Owen
patent: 3798938 (1974-03-01), McCullum
patent: 3832872 (1974-09-01), Gerlach
patent: 3922897 (1945-12-01), Mickelson
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