Impact resistant security door auxiliary latch mechanism

An auxiliary latching mechanism and complementary receiver adapted to be mounted on a door and complementary jamb having a primary latching mechanism said auxiliary latching mechanism and complementary receiver arranged to be mounted on said door and complementary jamb, and comprising:

• (a) an elongated plunger shaft having a cylindrical body and a substantially conical distal end arranged to extend from said door into said complementary receiver in said door jamb when said plunger shaft is in an extended position, said complementary receiver having a cylindrical concavity terminating in a substantially conical concavity, said plunger shaft and said cylindrical and substantially conical concavities being respectively configured so that said substantially conical distal end of said plunger shaft fits tightly into said substantially conical concavity while said cylindrical body of said plunger shaft fits loosely in said cylindrical concavity so that a diameter of said cylindrical body of said plunger shaft and a diameter of said cylindrical concavity have a predetermined size difference;
• (b) a power supply arranged to provide electrical power to said latching mechanism;
• and,
• (c) actuating means for forcibly maintaining said plunger shaft in an extended position, and for retracting said plunger shaft away from said receiver only when said actuating means is provided with electrical power.
• (d) guide means for sliding said plunger shaft into said complementary receiver.