Security system for loading doors
First Claim
1. A security system for a closed body having a door mounted thereon for movement between open and closed positions, and manually operable closure means provided externally of said body for closing said door, said security system comprisingmotor means mounted within said closed body on the interior of said door,a plunger axially aligned with and projecting outwardly of said motor means, said motor means supporting said plunger for relative lineal movement between extended and retracted positions upon activation of said motor means,strike means positioned within said body proximate to said door for operative engagement with said plunger upon movement of said door to its closed position and said plunger to its extended position, said engagement securing said door in its said closed position to prevent unauthorized or forced entry into said body should said closure means be breached or fail,means normally biasing said plunger toward its said extended position into operative engagement with said strike means,operating means for actuating said motor means to move said plunger from its extended to its retracted position disengaged from said strike means whereby said door is movable from its closed to its open position after release of said closure means said operating means comprisinga power source,power transfer means connected between said power source and said motor means,a security device operatively interposed in said transfer means between said power source and said motor means to control the transmission of power therebetween, said security device having a body portion disposed within said closed body and provided withan input connected through said transfer means to said power source,an output connected through said transfer means to said motor means,actuating means for operatively connecting said inlet and outlet to permit the transmission of power from said power source through said transfer means and said body portion to said motor means, such transmission actuating said motor means to move said plunger from its extended to its retracted position,lock means operable from the exterior of said body for selectively generating a specific input to actuate said actuating means, andmeans for holding said plunger in its retracted position during such time as said door is displaced from its closed position.
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Accused Products
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.
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Citations
15 Claims
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1. A security system for a closed body having a door mounted thereon for movement between open and closed positions, and manually operable closure means provided externally of said body for closing said door, said security system comprising
motor means mounted within said closed body on the interior of said door, a plunger axially aligned with and projecting outwardly of said motor means, said motor means supporting said plunger for relative lineal movement between extended and retracted positions upon activation of said motor means, strike means positioned within said body proximate to said door for operative engagement with said plunger upon movement of said door to its closed position and said plunger to its extended position, said engagement securing said door in its said closed position to prevent unauthorized or forced entry into said body should said closure means be breached or fail, means normally biasing said plunger toward its said extended position into operative engagement with said strike means, operating means for actuating said motor means to move said plunger from its extended to its retracted position disengaged from said strike means whereby said door is movable from its closed to its open position after release of said closure means said operating means comprising a power source, power transfer means connected between said power source and said motor means, a security device operatively interposed in said transfer means between said power source and said motor means to control the transmission of power therebetween, said security device having a body portion disposed within said closed body and provided with an input connected through said transfer means to said power source, an output connected through said transfer means to said motor means, actuating means for operatively connecting said inlet and outlet to permit the transmission of power from said power source through said transfer means and said body portion to said motor means, such transmission actuating said motor means to move said plunger from its extended to its retracted position, lock means operable from the exterior of said body for selectively generating a specific input to actuate said actuating means, and means for holding said plunger in its retracted position during such time as said door is displaced from its closed position.
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9. A security system for a truck or semi-trailer having a loading door movable thereon between open and closed positions and manually operable closure means provided externally of said body for closing said door, said system comprising
a pneumatic cylinder mounted on the interior of said door and provided with a plunger extending coaxially from one end thereof for movement between extended and retracted positions, strike means mounted on the interior of said body proximate to said door, said strike means operatively engaging the outer end of said plunger upon movement of said plunger to its extended position, said engagement securing said door in its closed position to prevent unauthorized or forced entry into said body should said closure means be breached or fail, a resilient spring member within said cylinder normally biasing said plunger toward its extended position into operative engagement with said strike means, a tank carried by said body and adapted to contain a quantity of compressed air, a security device mounted on the interior of said body and comprising a valve having an inlet port interconnected to said air tank an outlet port interconnected to said pneumatic cylinder, a pressure relief port communicating with the atmosphere, and a spool reciprocal within said valve between a first position isolating said inlet port from said outlet port while permitting communication between said cylinder and the atmosphere through said outlet port, and a second position closing said pressure relief port and interconnecting said inlet and outlet ports to permit the injection of compressed air into said cylinder to move said plunger from its extended position to its retracted position in contravention to the biasing action of said spring, means normally biasing said spool into its first position, means operable from the exterior of said body for selectively moving said spool from its first to its second position in contravention to said biasing means to interconnect said inlet and outlet ports and inject compressed air into said cylinder to move said plunger form its extended to its retracted position disengaged from said strike aperture whereby said door is movable to its open position after release from said closure means, said operating means comprising a key having an elongate shank insertable through as aperture in said door for engagement with said spool, said key being rotatable while in engagement with said spool to effect said movement of said spool from its first to its second position.
Specification