Locking device for utility locks with a key signal transmitter and a key signal receiver
First Claim
1. In a locking device for utility locks having a lock bolt;
- wherein a key signal transmitter is disposed in a portable housing and a stationary key signal receiver is disposed in the vicinity of the lock bolt and controls the operation of the lock bolt, said transmitter having a coder for generating a predetermined code specific to the locking device, said receiver having a decoder for decoding the code generated by said coder, the improvement comprising;
said coder comprising,an impulse generator for producing pulses at a constant pulse repetition rate, andpulse width modulation means coupled to said impulse generator for producing a key pulse upon each generation of a pulse by said impulse generator, each key pulse having a pulse width selected between predetermined limits within the period determined by the pulse repetition rate of said impulse generator, said pulse width generator producing a predetermined sequence of key pulses characterized by at least three different pulse widths; and
said decoder comprising means for decoding the predetermined sequence of said key pulses characterized by said at least three different pulse widths.
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Abstract
A locking device for utility locks having a lock bolt, wherein a key signal transmitter is disposed in a portable housing and a stationary key signal receiver is disposed in the vicinity of the lock bolt and controls the operation of the lock bolt. The transmitter has a coder for generating a predetermined code specific to the locking device, and the receiver has a decoder for decoding the code generated by the coder. The transmitter coder employs a coding format in which a predetermined sequence of at least three pulses, characterized by at least three different pulse widths is transmitted to the receiver and decoded thereat to unlock the utility lock upon decoding of the predetermined sequence.
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Citations
16 Claims
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1. In a locking device for utility locks having a lock bolt;
- wherein a key signal transmitter is disposed in a portable housing and a stationary key signal receiver is disposed in the vicinity of the lock bolt and controls the operation of the lock bolt, said transmitter having a coder for generating a predetermined code specific to the locking device, said receiver having a decoder for decoding the code generated by said coder, the improvement comprising;
said coder comprising, an impulse generator for producing pulses at a constant pulse repetition rate, and pulse width modulation means coupled to said impulse generator for producing a key pulse upon each generation of a pulse by said impulse generator, each key pulse having a pulse width selected between predetermined limits within the period determined by the pulse repetition rate of said impulse generator, said pulse width generator producing a predetermined sequence of key pulses characterized by at least three different pulse widths; and said decoder comprising means for decoding the predetermined sequence of said key pulses characterized by said at least three different pulse widths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- wherein a key signal transmitter is disposed in a portable housing and a stationary key signal receiver is disposed in the vicinity of the lock bolt and controls the operation of the lock bolt, said transmitter having a coder for generating a predetermined code specific to the locking device, said receiver having a decoder for decoding the code generated by said coder, the improvement comprising;
Specification