Abstract: A keyless system for quickly and conveniently securing the storage area of a delivery type truck against unauthorized entry and theft while the driver is away from the truck making a delivery or pickup. In reaching a delivery point or approaching the truck after a pickup, the driver actuates a portable transmitter to generate a wireless signal which is received and processed by a receiver within the truck and which unlocks and opens the access door to the storage area. Upon exit from the storage area after selecting or depositing a package, the driver simply taps a switch located in the cab of the truck to generate a signal which causes the access door to close and lock automatically. Securement of the rear cargo loading door also is controlled by use of the portable transmitter to generate a further signal for operating the loading door lock.

Abstract: A system for securing the loading doors of trucks, semi-trailers, and other like enclosures against forced or unauthorized entry should the usual manually operable closure device on such doors be breached. The system comprises a locking arrangement which is disposed entirely within but which is selectively operable from the exterior of the enclosure as by a special key or by activation of an electronic or electric circuit through entry of a predetermined code or signal. The locking arrangement includes a plunger which is automatically engageable with a strike member to secure a door upon its closure and which is moveable to an inoperative position by the action of a pneumatic or hydraulic cylinder or electric solenoid or other like activator.