Door tracking system and method

Abstract

A locking device that can be mounted into a rotating or swinging door is disclosed. The locking device can have a deadbolt. The locking device can detect the position of the deadbolt and/or whether the door is closed. The locking device can have a camera, microphone and speaker. The locking device can send images detected by the camera and audio detected by the microphones to a remote computer.

We claim: 
     
         1 . A system for sensing the position of a lock comprising:
 a bolt, wherein the bolt has at least a first bolt position and a second bolt position;   a bolt motor, wherein the bolt motor is configured to move the bolt from the first position to the second position;   an interference element; and   a sensor comprising a first mechanical switch and a second mechanical switch;   wherein when the interference element and the sensor are in a first orientation with respect to the bolt, one of the interference element or the sensor is attached to the bolt such that the attached interference element or sensor rotates between a first rotational position when the bolt is in the first bolt position, and a second rotational position when the bolt is in the second bolt position, and   wherein the first mechanical switch is activated by the interference element when the attached interference element or sensor is in the first rotational position, and wherein the second mechanical switch is activated by the interference element when the attached interference element or sensor is in the second rotational position.   
     
     
         2 . The system of  claim 1 , wherein the second mechanical switch is inactive when the attached interference element or sensor is in the first rotational position, and wherein the first mechanical switch is inactive when the attached interference element or sensor is in the second rotational position. 
     
     
         3 . The system of  claim 1 , wherein the first rotational position is 45° to 135° away from the second rotational position. 
     
     
         4 . The system of  claim 1 , wherein the sensor further comprises a third mechanical switch, and
 wherein the interference element and sensor have a second orientation with respect to the bolt, and wherein the second orientation is opposite the first orientation, and   wherein when the interference element and the sensor are in the second orientation, one of the interference element or the sensor is attached to the bolt such that the attached interference element or sensor rotates between a second rotational position when the bolt is in the first bolt position, and a third rotational position when the bolt is in the second bolt position, and   wherein the second mechanical switch is activated by the interference element when the attached interference element or sensor is in the second rotational position, and wherein the third mechanical switch is activated by the interference element when the attached interference element or sensor is in the third rotational position.   
     
     
         5 . The system of  claim 4 , wherein the first rotational position is 45° to 135° away from the second rotational position in a first direction, and wherein the third rotational position is 45° to 135° away from the second rotational position in a second direction opposite to the first direction. 
     
     
         6 . The system of  claim 1 , further comprising a remote signal sensor configured to receive a wireless signal to activate the bolt motor. 
     
     
         7 . The system of  claim 1 , wherein the first and second mechanical switches comprise toggle switches. 
     
     
         8 . The system of  claim 1 , further comprising a processor and a sensor configured to detect a motor current, wherein the system is configured that when the sensor detects that the motor current exceeds a reference value, the processor signals that the bolt is positioned at an extent of travel for the bolt. 
     
     
         9 . The system of  claim 1 , further comprising a door position sensor. 
     
     
         10 . The system of  claim 1 , further comprising a lock cylinder, and wherein the one of the interference element or the sensor that is attached to the bolt is rotationally fixed to at least part of the lock cylinder.