Electronic key for an electrical apparatus and electrical apparatus with receiver for an enabling signal
First Claim
1. An electronic key for locking and for releasing operation of an electrical apparatus, in order to protect the electrical apparatus from theft or unauthorized use, said electronic key comprising an antenna and a transmitter for wireless transmission of a release signal to the electrical apparatus;
- and a current supply circuit for passive current supply, said current supply circuit being connected with said antenna, in order to acquire or collect electrical energy from an electromagnetic interrogation signal received by said antenna.
1 Assignment
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Accused Products
Abstract
The electronic key for disabling or enabling operation of an electrical apparatus, especially for preventing theft of a hand-held power tool, includes a transmitter and antenna for wireless transmission of a release signal to enable operation of the electrical apparatus. For passive current supply the electronic key is provided with a current supply circuit connected electrically with its antenna, in order to obtain electrical energy from an electromagnetic interrogation signal received by its antenna from the electrical apparatus. The electronic key can include a memory for one or more enabling signals for enabling operation of one or more different electrical units. The electrical apparatus includes a receiver with an antenna for receipt of the release or enable signals and a transmitter for the interrogation signal.
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Citations
21 Claims
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1. An electronic key for locking and for releasing operation of an electrical apparatus, in order to protect the electrical apparatus from theft or unauthorized use, said electronic key comprising
an antenna and a transmitter for wireless transmission of a release signal to the electrical apparatus; - and
a current supply circuit for passive current supply, said current supply circuit being connected with said antenna, in order to acquire or collect electrical energy from an electromagnetic interrogation signal received by said antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrical apparatus comprising
an antenna and a receiver for receipt of a release signal from an electronic key; -
a control unit for release or blocking operation in accordance with said release signal, said control unit being connected with said receiver; and
a transmitter for wireless transmission of an electromagnetic interrogation signal to the electronic key in order to supply the electronic key with energy from the interrogation signal and to prompt the release signal from the electronic key. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A security system comprising at least one electronic key and at least one electrical apparatus supervised by said at least one electronic key;
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wherein said at least one electronic key comprises a key antenna and a key transmitter for wireless transmission of a release signal for enabling operation of said at least one electrical apparatus and a current supply circuit for passive current supply, said current supply circuit being connected with said key antenna in order to acquire or collect electrical energy from an electromagnetic interrogation signal received by said key antenna; and
wherein said at least one electrical apparatus comprises an electrical apparatus antenna and an electrical apparatus receiver for receipt of said release signal from said at least one electronic key;
a controller for releasing or blocking operation of said at least one electrical apparatus in accordance with said release signal, said controller being connected with said electrical apparatus receiver; and
an electrical apparatus transmitter for wireless transmission of the electromagnetic interrogation signal to said at least one electronic key, in order to supply said at least one the electronic key with electrical energy from the interrogation signal and to prompt transmission of the release signal from said at least one electronic key. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification