Magnetic locking status detection system
First Claim
1. A magnetic lock and status detection system for a door or the like comprising:
- an electromagnet having a core structure made of conductive magnetic material and having at least two separate core portions insulated from one another;
a magnetic strike plate made of conductive magnetic material;
means for mounting said electromagnetic and strike plate on a door and a door frame, respectively, for relative movement between a closed position wherein said strike plate engages both of said two separate core portions, and an open position wherein the door is open and said strike plate is spaced from said electromagnet;
an electrical control and sensing unit, said electrical control and sensing unit including door closure detection circuit means;
means for supplying power to said electromagnet from said electrical control and sensing unit; and
electrical connections from said detection circuit means of said control and sensing unit to each of said two separate core portions;
whereby the engagement of said strike plate with said two separate core sections and the resultant closure of an electrical path between said electrical connections indicates to said detection circuit means whether the door is open or closed.
1 Assignment
0 Petitions
Accused Products
Abstract
Magnetic door locks characteristically include a high strength electromagnet and a mating plate made of magnetically permeable material, or door strike, mounted on the door frame and the door, respectively. In addition, in order to determine whether the door strike is in engagement with the electromagnet, detection arrangements are provided; and in the present case, simplified detection arrangements are provided by separate portions of the electromagnetic core separated by non-conducting shims or the like, and the closing of a detection circuit extending between the two portions of the electromagnetic core by the magnetic and electrically conducting door strike bridging between the two sections of the core. In addition, the detection circuit may be electrically connected in parallel with electromagnet energization circuit, to positively indicate both that the electromagnet is energized and that the door is closed.
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Citations
10 Claims
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1. A magnetic lock and status detection system for a door or the like comprising:
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an electromagnet having a core structure made of conductive magnetic material and having at least two separate core portions insulated from one another; a magnetic strike plate made of conductive magnetic material; means for mounting said electromagnetic and strike plate on a door and a door frame, respectively, for relative movement between a closed position wherein said strike plate engages both of said two separate core portions, and an open position wherein the door is open and said strike plate is spaced from said electromagnet; an electrical control and sensing unit, said electrical control and sensing unit including door closure detection circuit means; means for supplying power to said electromagnet from said electrical control and sensing unit; and electrical connections from said detection circuit means of said control and sensing unit to each of said two separate core portions; whereby the engagement of said strike plate with said two separate core sections and the resultant closure of an electrical path between said electrical connections indicates to said detection circuit means whether the door is open or closed. - View Dependent Claims (2, 3, 4)
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5. A magnetic lock and status detection system for a door or the like comprising:
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an electromagnet assembly including an exposed faceplate; said electromagnet assembly including electrically insulated spaced electrically conductive members extending to said faceplate; a magnetic strike plate made of conductive magnetic material; means for mounting said electromagnet assembly and strike plate on two relatively movable members, for movement between a closed position wherein said strike plate engages said faceplace and an open position wherein the movable members are spaced apart from one-another and said strike plate is spaced from said electromagnet; an electrical control and sensing unit, said electrical control and sensing unit including door closure detection circuit means; means for supplying power to said electromagnet from said electrical control and sensing unit; and electrical connections from said detection circuit means of said control and sensing unit to each of said two separate electrically conductive members; whereby the engagement of said strike plate with said two separate electrically conductive members and the resultant closure of an electrical path between said electrical connections indicates to said detection circuit means whether the door is open or closed. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification