Paystation monitor circuit to prevent fraudulent use
First Claim
Patent Images
1. An off-hook reset circuit for use in a telephone paystation, said paystation including, a calling device, connections to a telephone central office, a rate relay, a totalizer circuit, a hookswich circuit and a central office battery circuit;
- said reset circuit comprising;
a latch circuit;
a first gate circuit connected between said hookswitch circuit and said latch circuit operated to reset said latch circuit in response to a signal from said hookswitch circuit;
an oscillator circuit connected to said latch, enabled to generate a train of reset pulses in response to said latch being reset;
second gating means connected between said oscillator and said rate relay operated to gate a reset pulse to said rate relay;
whereby said totalizer circuit is reset and said calling device is disabled.
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Abstract
A paystation circuit that monitors coin battery signals, hookswitch detect signals and initial rate conditions to provide proper reset signals to the totalizer circuit enabling and/or disabling the dial keypad in order to prevent fraudulent paystation usage.
32 Citations
7 Claims
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1. An off-hook reset circuit for use in a telephone paystation, said paystation including, a calling device, connections to a telephone central office, a rate relay, a totalizer circuit, a hookswich circuit and a central office battery circuit;
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said reset circuit comprising; a latch circuit; a first gate circuit connected between said hookswitch circuit and said latch circuit operated to reset said latch circuit in response to a signal from said hookswitch circuit; an oscillator circuit connected to said latch, enabled to generate a train of reset pulses in response to said latch being reset; second gating means connected between said oscillator and said rate relay operated to gate a reset pulse to said rate relay; whereby said totalizer circuit is reset and said calling device is disabled. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification