Security lock

Claim 2

In a lock for use with a moveable closure or the like having a two position bolt adapted to move into the path of movement of the closure to a locked position to prevent movement thereof or move out of the path of movement of the closure to unlocked position to permit movement thereof, the improvements, comprising: a. electric motor means including a pair of solenoids adapted to be selectively energized for moving the bolt between its two positions, b. means for preventing movement of the bolt when disposed at its two positions, c. a two position control switch for energizing the motor means for selectively causing same to move the bolt between its two positions, and d. other switch means operated by movement of the bolt for de-energizing the motor means when the bolt moves to its two positions.

Claim 3

Apparatus in accordance with claim 1, wherein said other switch means establishes a circuit for moving the bolt from one of its positions to the other when the control switch is moved to its other position.

Claim 4

Apparatus in accordance with claim 1 including means for preventing movement of the bolt when disposed at its two positions.

Claim 5

Apparatus in accordance with claim 3 including other switch means operated by movement of the bolt for deenergizing the motor means when the bolt moves to its two positions.

Claim 6

Apparatus in accordance with claim 1, wherein said closure is disposed at the rear end of a truck and constructed as an articulated curtain adapted to be guided by side rails from a vertical closed position thereat to a horizontal open position adjacent and beneath the roof of the truck.

Claim 7

Apparatus in accordance with claim 5 wherein the lock is disposed near the roof of the truck.

Claim 8

Apparatus in accordance with claim 5 wherein said bolt slideably extends through an opening in one of said rails and moves between blocked and unblocked positions relative to an abutment, such as a roller, carried by the closure.

Claim 9

Apparatus in accordance with claim 7 wherein the lock is disposed inside the truck near the roof thereof.

Claim 10

Apparatus in accordance with claim 8 wherein the electric motor means is energized by a battery carried by the truck.

Claim 11

In a lock for use with a movable closure or the like having a two position bolt adapted to move into the path of movement of the closure to a locked position to prevent movement thereof or move out of the path of movement of the closure to unlocked position to permit movement thereof, the improvements comprising: a. a first solenoid having a movable core connected to the bolt for moving it to locked position, b. a second solenoid having a movable core connected to the bolt for moving it to unlocked position, c. a third solenoid having a movable core and means operable thereby for releasing said locking bolt from locked position, d. a fourth solenoid having a movable core and means operable thereby for releasing said locking bolt from unlocked position, e. a control switch for selectively energizing either said first and fourth solenoids or said second and third solenoids to move the bolt between locked and unlocked positions, f. each of said third and fourth solenoids having a switch movable thereby to open a circuit when it moves to its locked position so that all solenoids are de-energized to obviate application of continued electrical energy after the bolt is in either of its two positions.

Claim 12

In a lock for use with a movable closure or the like having a two position bolt adapted to move into the path of movement of the closure to a locked position to prevent movement thereof or move out of the path of movement of the closure to unlocked position to permit movement thereof, the improvements comprising: a. a first solenoid having a movable core connected to the bolt for moving it to locked position, b. a second solenoid having a movable core connected to the bolt for moving it to unlocked position, c. a third solenoid having a movable core and means operable thereby for releasing said locking bolt from locked position, d. a fourth solenoid having a movable core and means operable thereby for releasing said locking bolt from unlocked position, e. a control switch for selectively energizing either said first and fourth solenoids or said second and third solenoids to move the bolt between locked and unlocked positions, f. each of said third and fourth solenoids having a switch movable thereby to open a circuit when it moves to its locked position so that all solenoids are de-energized to obviate application of continued electrical energy after the bolt is in either of its two positions.

Claim 13

Apparatus in accordance with claim 10 wherein: the cores of the first and second solenoids are axially aligned and connected to form a common core with a pair of field windings surrounding same and so wound to selectively move the bolt between its two positions.

Claim 14

Apparatus in accordance with claim 10 wherein: the bolt is disposed at one side of the core and moves parallel therewith.

Claim 15

Apparatus in accordance with claim 10 wherein: the cores of the third and fourth solenoids are moved toward locking position when de-energized.

Claim 16

Apparatus in accordance with claim 13 wherein: the cores of the third and fourth solenoids are oriented in substantially vertical positions and drop by urge of gravity to their locking positions.

Claim 17

Apparatus in accordance with claim 10 wherein: the cores of the first and second solenoids are axially aligned to form a common core with a pair of field windings surrounding same and so wound to selectively push or pull the bolt between its two positions, said common core having a pair of axially spaced depressions therein each being selectively engagable by the means operable by the third and fourth solenoids respectively.