THEFTPROOF LOCKABLE COUPLING DEVICE

摘要

A lockable coupling device for a truck trailer has a pin which can be moved axially out of baseplate for engagement with a coupling plate of a tractor. A shaft is operatively arranged to advance and retract the pin. The shaft is joined to a barrel rotatable by a crank. The barrel can be locked against rotation by a lock in the barrel. The crank carries a key for locking and unlocking the barrel. A motor may be provided to drive the shaft for extending the pin. The pin may be arranged to obstruct a hole in a coupling plate attached to a truck trailer. The pin can be provided with a spring for automatic retraction when the shaft is retracted. The rotatable barrel may have switch contacts connected in circuit with the motor. The motor may be driven electrically or hydraulically.