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| Solenoids Used in Locking and Latching applications |
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A manufacturer of an automated vending machine designed for commercial credit card purchases needed a reliable, economical mechanism to repeatedly lock and unlock a critical compartment drawer through which merchandise would drop to customers.
Based on its power, size and affordability, a Saia-Burgess open frame solenoid was selected to provide the actuation for this application. In operation, the solenoid releases the drawer when energized with a credit card purchase. After merchandise passes through the drawer, the solenoid becomes de-energized, and latches the drawer in place.
Replacing a number of mechanical devices as a more cost effective and reliable means of providing actuation, Saia-Burgess solenoids provide fast and powerful operation at high speeds. This makes them highly suitable for locking and latching mechanisms. In addition to vending machine doors, Saia-Burgess solenoids have recently been added to the design of high security doors, commercial machinery, and computer peripherals.
Solenoids Secure Door Locks
Prison doors, an obvious candidate for maximum security, use a rotary solenoid to open the bolt that holds a prison door closed. A short stroke tubular solenoid is also applied in this same operation to move smaller bolts requiring minimal force. Both the rotary and tubular door locking applications use a "pick and hold" concept with a center tapped winding. This allows reduced power for the open condition on the latch. A variety of rotary solenoids are specified in the design of commercial and residential locks. In a high security door design, a compact tubular solenoid is installed within a door strike, preventing the strike from moving when the solenoid is de-energized. Only when the solenoid is energized will the door open. Fire doors use a reverse application. A solenoid is energized to keep a door open, thereby permitting ease of exit for building occupants.
Tubular solenoids are installed in "smart" locks on many hotel doors where a credit card key is used to provide access. When the card reading circuit finds the appropriate codes on an inserted card, the solenoid is energized, forcing the bolt out of place and allowing the door to be opened. When the card is removed, the solenoid provides for an automatic door relock. In addition to long life, the tubular solenoid operates quietly, maintaining minimal noise disturbance.
Solenoids "Lock" Commercial Products
In the commercial sector, a high torque, high endurance rotary solenoid is used on a lock for an x-ray developing machine. When energized, the solenoid moves a cylinder to an open position through which film drops to be developed. A size 3 rotary solenoid was selected for this application because of its extended life (100 million cycles), and high output/size ratio.
An economical linear open frame solenoid locks and releases the door of a front-loading commercial washer's door is powered to open, the associated circuitry is programmed to allow for a one minute delay before unlatching the door to prevent water or laundry spillage. When the solenoid is energized, the door is locked.
Solenoids Prevent Computer Failure
The long life and high reliability of the tubular solenoid provides greater functionality for computer systems where field servicing is often prohibitive. For example, a pull-type tubular solenoid serves as a locking mechanism for a multi-terminal computer system to position the cartridge, allowing for reliable automatic tape threading. The same type of solenoid also latches a door while a tape cartridge is being rewound. This prevents the tape from being removed from the cartridge until the rewind process is completed.
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