Fail-secure and fail-safe door lock mechanism

An electric door lock device comprising,

• an elongated housing for mounting in a door or frame member,
• a bolt slideably 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, nonlocking position,
• actuator plate means for actuating said bolt between said first and second positions, said plate means being movably mounted in said housing for movement between first and second positions
• a solenoid means for electrically actuating said plate means from said first position to said second position,
• spring means for normally biasing said plate means toward said first position, and
• means for operationally interconnecting said bolt to said plate means for driving said bolt between said first and second positions responsive to movement of said plate means between said first and second positions, said interconnecting means including means for moving said bolt to said first position upon movement of said plate means to said first position and for moving said bolt to said second position upon movement of said plate means to said second position to provide a fail-secure operational mode and means for moving said bolt to said second position upon movement of said plate means to said first position and for moving said bolt to said first position upon movement of said plate means to said second position to provide a fail-safe operational mode,
• said bolt being operationally interconnnected to said plate means for driving said bolt to one of said first and second positions upon movement of said plate means from said first position to said second position and for driving said bolt to the other of said first and second positions upon movement of said plate means from said second position to said first position.