System for monitoring the closing of a door
First Claim
1. A system for monitoring the closing state of a movable barrier which is mounted on a frame defining an opening and is movable between an open and a closed position, said system comprising:
- first electric circuit means mounted on said barrier for being moved therewith and including first inductive means; and
second electric circuit means mounted outside said barrier and including second inductive means and an oscillator means for producing, if switched on, an electric current in said second circuit means;
said first and second inductive means being arranged with respect to each other in such a way that, if said oscillator means is switched on, said second inductive means is enabled to contactlessly induce electric energy in said first inductive means for activating said first electric circuit means, and said first inductive means is enabled to contactlessly induce an electric signal characteristic of a closure state of said barrier in second inductive means in at least one selected position of said barrier.
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Accused Products
Abstract
The invention relates to a system for monitoring the closing of a door or other such barrier, such as a sliding door of a vehicle. This system has a circuit outside of the door which serves to emit a signal indicating the open or closed state of the door. In the production of this signal, the need for any electromechanical limit switches or indicating devices mounted on the door and coupled galvanically with the circuit is avoided by providing, in accordance with the invention, a circuit that is mounted on the door. Both circuits have at least one inductive element. The inductive elements are coupled only inductively with one another, but are not in physical contact with one another, so that the production of the signal indicating the open or closed state of the door can be performed contactlessly.
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Citations
19 Claims
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1. A system for monitoring the closing state of a movable barrier which is mounted on a frame defining an opening and is movable between an open and a closed position, said system comprising:
- first electric circuit means mounted on said barrier for being moved therewith and including first inductive means; and
second electric circuit means mounted outside said barrier and including second inductive means and an oscillator means for producing, if switched on, an electric current in said second circuit means;
said first and second inductive means being arranged with respect to each other in such a way that, if said oscillator means is switched on, said second inductive means is enabled to contactlessly induce electric energy in said first inductive means for activating said first electric circuit means, and said first inductive means is enabled to contactlessly induce an electric signal characteristic of a closure state of said barrier in second inductive means in at least one selected position of said barrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- first electric circuit means mounted on said barrier for being moved therewith and including first inductive means; and
Specification