1 Answers
An electric strike is an access control device used for door frames. It replaces the fixed strike faceplate often used with a latch. Like a fixed strike plate, it normally presents a ramped or beveled surface to the locking latch allowing the door to close and latch just like a fixed strike would. However, an electric strike's ramped surface can, upon command, pivot out of the way when the lock on the door is in the locked position and the door is opened, allowing a user to pull/push the door to open it without operating the mechanical lock or using a mechanical key. After the door is opened past the keeper, the keeper returns to its standard position and re-locks when power is removed or applied, depending upon the strike's configuration.
Electric strikes are generally available in three configurations:
A new trend is a strike that is quickly reversible from fail safe to fail secure. Some manufacturers require the opening of the solenoids, but others allow the reversing of the function within seconds with only the movement of two external screws or a mechanical unlocking accessory which is directly accessible when the door is open. This is exactly the same principle as a child safety door lock which is installed on car doors.
Electric strikes are sometimes equipped with buzzers that allow someone outside the door to hear when the door is open. The buzzing noise is typically made by applying alternating current to the strike instead of direct current. When using a DC powered strike, a buzzer accessory can be added to create the buzzing noise, if desired.