Security lock
AssigneeTransport Security Systems, Inc.
InventorsW. Ray Counts, Wayne M. Schickedanz
Life of this patent
Estimating the term…
Abstract
Electrically operated lock for a closure, such as a truck door, characterized by a bolt movable between locked and unlocked positions and latched against movement in both positions, the bolt movement being under control of a two position switch and other switches which disconnect electrical energization when the bolt moves to either position. The apparatus is located at an inaccessibly position, preferably inside the truck, to prevent tampering therewith from outside the truck.
Claims15
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.
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.
Dependencies are inferred from the claim text.