Patent ID: 6950033

Claim:
A system for determining the position of a bolt in a door comprising: a) a locking mechanism for moving the bolt between a first locked position wherein the door is secured in position within a door frame and a second unlocked position wherein the door is moveable within the door frame; b) means for determining the position of said bolt and generating a signal indicative of the position of the bolt; c) a transmitter connected to said determining means; and d) means for indicating the position of the bolt, said indicating means includes a processor and receiver and wherein said transmitter transmits said signals generated by said determining means and said receiver receives said signal and provides said signal to said processor for determining the position of the bolt and generating a signal indicative of said determination, wherein said locking mechanism includes a cylinder, the bolt being at least partially received within said cylinder and said determining means is a magnetic switch mechanism comprising: i) a first magnetic plate connected to an end of said bolt; ii) a first set of electrical contacts positioned within said locking mechanism on a side of the said cylinder opposite said bolt; iii) a second set of electrical contacts connected to said cylinder; iv) a second magnetic plate having a third set of electrical contacts on a first side thereof and a fourth set of electrical contacts on a second side thereof; and v) a bias spring connecting said second side of said second magnetic plate to said second set of electrical contacts, wherein when said bolt is in said first locked position, said bias spring applies a force to said third set of electrical contacts causing said third set of electrical contacts to contact said first set of electrical contacts thereby generating a signal indicating that said bolt is in said first locked position and, when said bolt is in said second unlocked position, said first magnetic plate magnetically attracts said second magnetic plate thereto overcoming a bias force of said spring and bring said fourth set of electrical contacts into contact with said second set of electrical contacts thereby generating a signal indicating said bolt is in said second unlocked position.