Compact electric strike with preload release capability

In a door strike for captivating and releasing a door bolt, the combination comprising

• a) a longitudinally elongated carrier,
• b) a longitudinally elongated solenoid supported by the carrier, the solenoid having a longitudinally movable plunger,
• c) a trip lever pivotally supported in or on the carrier,
• d) a laterally extending actuating arm pivotally supported in or on the carrier to be pivoted as the plunger moves longitudinally in response to solenoid energization, thereby to pivot the trip lever, there are two of said retainers which have L-shaped door bolt captivating terminals that spread apart as the two retainers pivot,
• e) a generally longitudinally extending blocking arm or arms pivotally supported in or on the carrier to be released for pivoting when the trip lever is pivoted,
• f) a door bolt retainer or retainers pivotally supported in or on the carrier to be released for pivoting when the blocking arm or arms are released for pivoting, thereby to release the door bolt from captivation, for movement with the door, and
• there being two of said retainers which have L-shaped door bolt captivating terminals that spread apart as the two retainers pivot.

In a door strike for captivating and releasing a door belt, the combination comprising

• a) mechanism including a solenoid,
• b) said mechanism having an adjusted fail secure first configuration characterized in that when electrical power to the solenoid is OFF, the mechanism is locked, preventing release of the door bolt for door opening,
• c) said mechanism having an adjusted fail safe second configuration characterized in that when electrical power to the solenoid is ON, the mechanism is locked, and when electrical power to the solenoid is OFF, the mechanism is unlocked, releasing the door bolt for door opening,
• d) said mechanism including a trip lever operatively connected to the solenoid and having a first pivoted position in which door bolt retainers are locked against pivoting when power to the solenoid is OFF in said fail secure configuration, and when power to the solenoid is ON in said fail safe configuration, and
• e) said mechanism including a slide link and a tab on said link movable by the link between a first position registered with the trip lever and effecting blocking thereof, and a second position wherein the tab is not registered with the trip lever.