KEY-OPERATED SWITCH
First Claim
1. A key-operated switch, comprising a first excitation device which generates a first alternating magnetic field to scan a first coding of a key as the key is inserted in an insertion direction and which has a first inductance, wherein the first inductance of the first excitation device changes in response to a scanning of the first coding to thereby allow reading of the first coding.
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Accused Products
Abstract
A key-operated switch includes a first excitation device which generates a first alternating magnetic field and has a first inductance. The key-operated switch is constructed in such a manner that the first alternating magnetic field can be used to scan a first coding of a key, with the first coding changing the first inductance of the first excitation device. The first coding is read by the key-operated switch in this manner. The key associated with the key-operated switch has a carrier element which is not electrically conductive and is not magnetizable. Arranged on the carrier element is the first coding which is made of an electrically conductive and/or magnetizable material. As a result, the key can be scanned without wear.
20 Citations
19 Claims
- 1. A key-operated switch, comprising a first excitation device which generates a first alternating magnetic field to scan a first coding of a key as the key is inserted in an insertion direction and which has a first inductance, wherein the first inductance of the first excitation device changes in response to a scanning of the first coding to thereby allow reading of the first coding.
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13. A key, comprising:
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a carrier element which is not electrically conductive and not magnetizable; and a first coding made of an electrically conductive and/or magnetizable material and arranged on the carrier element. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An operating device for operating a machine and/or a system from automation technology, said operating device comprising a key-operated switch including a first excitation device which generates a first alternating magnetic field to scan a first coding of a key as the key is inserted in an insertion direction and which has a first inductance, wherein the first inductance of the first excitation device changes in response to a scanning of the first coding to thereby allow reading of the first coding.
Specification