Door locking device

For use with a door closing shut adjacent a door jamb, the door jamb including a dead bolt receiving striker plate and the door supporting a door locking dead bolt means having an interiorally exposed key operated lock and an interiorally exposed key operated lock and interiorally exposed thumb knob with a locking surface thereon wherein the locking surface rotates between first and second positions indicative of dead bolt movement between locked and unlocked positions relative to the striker plate on the door jamb, an interiorally located door locking apparatus comprising:

• (a) support means mountable on the interior surface of the door;
• (b) dead bolt slide means slidable between first and second positions, said slide means supported by said support means for sliding movement;
• (c) elongated locking means cooperative with the thumb knob locking surface to lock the thumb knob at a rotated position after dead bolt insertion into the striker plate;
• (d) cooperative striker plate means aligned with said dead bolt slide means to receive said dead bolt slide means on movement to the second position thereof and wherein said elongate locking means is held to lock the thumb knob, said cooperative striker plate means being mountable on the door jamb at a location to cooperate with said dead bolt slide means in holding the thumb knob in the locked rotated position;
• and
• (e) auxiliary locking means for engaging said dead bolt slide means in a locking relationship to prevent movement between the first and second positions.