Door strike having a dead latch release
An actuator-controlled strike comprising a housing disposable within a doorframe and including a cavity for a spring latch and a dead latch of a mortise-type lockset. A keeper is pivotably mounted within the chamber to engage the spring latch. A pivotably mounted kicker cooperates with the keeper. A pivotably mounted dead latch release is supported by the keeper when the spring latch is within the strike. The keeper is released by the actuator and rotates into a position to ramp the spring latch out of the strike, also allowing the dead latch release to release the dead latch into the cavity, allowing the spring latch to be ramped out of the strike. Pivoting the keeper causes the kicker to urge the spring latch onto an exit ramp on a face of the keeper. The dead latch release can be installed in a plurality of different locations in the housing.
1 . An electric strike assembly, comprising:
a) a housing formed with a cavity therein;
b) a keeper pivotably mounted in said cavity of said housing, wherein said keeper includes a first tooth and a second tooth;
c) a dead latch release platform pivotably mounted in said cavity of said housing and configured to rotate independently of a rotation of said keeper; and
d) an actuator including an inhibitor, wherein said inhibitor includes a first tooth, a second tooth, and a third tooth, wherein a first recess is defined between said first tooth and said second tooth, wherein a second recess is defined between said second tooth and said third tooth, and wherein said inhibitor is selectively positionable in a fail-secure mode and a fail-safe mode,
e) wherein when said inhibitor is in said fail-secure mode:
said actuator is configured to move said inhibitor between a first position and a second position,
wherein only said first and second teeth of said inhibitor are configured to directly engage said first and second teeth of said keeper, respectively, when said inhibitor is in said first position and said actuator is de-energized, and
wherein said first and second recesses are aligned with said first and second teeth of said keeper, respectively, when said actuator is energized and said inhibitor is moved to said second position, and
f) wherein when said inhibitor is in said fail-safe mode:
said actuator is configured to move said inhibitor between said second position and a third position,
wherein said first and second recesses are aligned with said first and second teeth of said keeper, respectively, when said inhibitor is in said second position and said actuator is de-energized, and
wherein only said second and third teeth of said inhibitor are configured to directly engage said first and second teeth of said keeper, respectively, when said actuator is energized and said inhibitor is moved to said third position.
2 . An electric strike assembly in accordance with claim 1 further comprising a compression spring disposed between said actuator and said inhibitor.
3 . An electric strike assembly in accordance with claim 1 wherein said actuator is a solenoid.
4 . An electric strike assembly in accordance with claim 3 wherein said solenoid is a linearly-acting solenoid.
5 . A method of releasing a spring latch from an electric strike assembly, the method comprising:
a) mounting said electric strike assembly in an associated door jamb, said electric strike assembly comprising:
a housing formed with a cavity therein;
a keeper pivotably mounted in said cavity of said housing, wherein said keeper includes a first tooth and a second tooth;
a dead latch release platform pivotably mounted in said cavity of said housing and configured to rotate independently of a rotation of said keeper; and
an actuator including an inhibitor, wherein said inhibitor includes a first tooth, a second tooth, and a third tooth, wherein a first recess is defined between said first tooth and said second tooth, wherein a second recess is defined between said second tooth and said third tooth, and wherein said inhibitor is selectively positionable in a fail-secure mode and a fail-safe mode; and
b) wherein when said inhibitor is in said fail-secure mode said inhibitor is in a first position and a second position, wherein said inhibitor is in said first position so that only said first and second teeth of said inhibitor are in interfering relationship with said first and second teeth of said keeper when said actuator is de-energized, and wherein when said actuator is energized said inhibitor is moved to said second position so that said first and second teeth of said keeper are aligned with said first and second recesses; and
c) wherein when said inhibitor is in said fail-safe mode said inhibitor is in said second position and a third position, wherein said inhibitor is in said second position so that said first and second teeth of said keeper are aligned with said first and second recesses when said actuator is de-energized, wherein when said actuator is energized said inhibitor is moved to said third position so that only said second and third teeth of said inhibitor are in interfering relationship with said first and second teeth of said keeper.
6 . A method in accordance with claim 5 wherein said electric strike assembly further comprises a compression spring disposed between said actuator and said inhibitor.
7 . A method in accordance with claim 5 wherein said actuator is a solenoid.
8 . A method in accordance with claim 7 wherein said solenoid is a linearly-acting solenoid.