Electric fail-secure/fail-open lock mechanism

An automatically deadlatching door lock comprising,

• an elongated housing for mounting in a door or frame member,
• a bolt supported in said housing for movement between a projected locking position and a retracted non-locking position, said bolt having an exterior end and an interior end, said bolt being tubular with a longitudinal slot forming a lateral edge disposed towards said exterior end,
• a means for normally urging said bolt toward said projected position,
• a crank lever having first and second ends, said first end being pivotally mounted to said housing and said second end extending into said slot, said lever being pivotally mounted to pivot between first and second positions, said second end being engageable with said interior end of said bolt to push said bolt to said retracted position upon pivotal movement of said crank lever to said second position,
• said second end of said crank lever having a first retaining surface adjacent said lateral edge and a second retaining surface adjacent the exterior of said bolt when said crank lever is in said first position,
• means for yieldably maintaining said first retaining surface adjacent said lateral edge upon external driving of said bolt toward said retracted position, and
• actuable means for pivoting said crank element between said first and second positions,
• whereby said first retaining surface engages said lateral edge and said second retaining surface engages said exterior of said bolt upon external driving of said bolt towards said retracted position to automatically deadlatch said bolt.

An electric door lock, comprising:

• an elongated housing for mounting in a door or frame member;
• a bolt slidably mounted in said housing for movement between a first position and a second position, said first position being a projected, locking position and said second position being a retracted, non-locking position;
• means normally urging said bolt towards one of said first and second positions;
• a solenoid means for electrically actuating said bolt to the other of said first and second positions, said solenoid means having a plunger element movable from a first position to a second position;
• means for operatively connecting said plunger element to said bolt to move said bolt to said other of said first and second positions by movement of said plunger element to said second position;
• said plunger element of said solenoid means having an upper end operationally connected to said connecting means and a lower end;
• and
• manually operative rotative means for mechanically moving said plunger element to said second position comprising a cam element rotatably mounted within said housing and means for manually rotating said cam element disposed exterior of said housing, said cam element operationally engaging said lower end of said plunger element upon angular rotation to move said plunger element to said second position.

An electric door lock, comprising:

• an elongated housing for mounting in a door or frame member;
• a bolt slidably mounted in said housing for movement between a first position and a second position, said first position being a projected, locking position and said second position being a retracted, non-locking position;
• a spring biasing said bolt towards said first position;
• a solenoid means for electrically actuating said bolt to said second position, said solenoid means having a plunger element movable from a first position to a second position;
• means for operatively connecting said plunger element to said bolt to move said bolt to said second position by movement of said plunger element to said second position;
• and
• manually operative rotative means for mechanically moving said plunger element to said second position,
• said connecting means comprising a bellcrank having one end portion pivotally mounted to said housing and the other end portion engaging said bolt so that movement of said plunger element to said second position pivots said bellcrank to retract said bolt to said non-locking position;
• whereby manual rotation of said moving means moves said bolt to the non-locking position and, alternately, actuation of said solenoid means moves said bolt to the non-locking position.

An electric door lock, comprising:

• an elongated housing for mounting in a door or frame member;
• a bolt slidably mounted in said housing for movement between a first position and a second position, said first position being a projected, locking position and said second position being a retracted, non-locking position;
• a spring biasing said bolt towards said second position;
• a solenoid means for electrically actuating said bolt to the said first position, said solenoid means having a plunger element movable from a first position to a second position;
• means for operatively connecting said plunger element to said bolt to move said bolt to said first position by movement of said plunger element to said second position;
• and
• manually operative rotative means for mechanically moving said plunger element to said second position;
• said connecting means comprising a bellcrank having one end portion pivotally mounted to said housing and the other end portion engaging said bolt so that movement of said plunger element to said second position pivots said bellcrank to project said bolt to the locking position;
• and
• whereby manual rotation of said moving means moves said bolt to the locking position and, alternatively, actuation of said solenoid means moves said bolt to the locking position.

An electric door lock, comprising:

• an elongated housing for mounting in a door or frame member;
• a bolt slidably mounted in said housing for movement between a first position and a second position, said first position being a projected, locking position and said second position being a retracted, non-locking position;
• means normally urging said bolt towards one of said first and second positions;
• a first solenoid means for electrically actuating said bolt to the other of said first and second positions, said solenoid means having a plunger element movable from a first position to a second position;
• means for operatively connecting said plunger element to said bolt to move said bolt to said other of said first and second positions by movement of said plunger element to said second position;
• manually operative rotative means for mechanically moving said plunger element to said second position;
• and
• a second solenoid means for deadlatching said bolt in said protracted position to resist external driving of said bolt toward said retracted position independently of whether the first solenoid means remains electrically actuated.