Coin telephone system having restricted coin-free dialing capability
AssigneeAkzona Incorporated
InventorWilliam Robert Hunsicker
Life of this patent
Estimating the term…
Abstract
A conventional telephone pay station is adapted for coin-free restricted dialing of a preselected number of digits by employing a two-coil latching relay operating a switch for shunting outgoing calls, one coil being operated after a predetermined time delay responsive to detection of an offhook condition to open the switch, and the second coil being operated responsive to the detection of dialing by the calling party of a number of digits greater than the preselected number to close the switch. Anti-fraud circuits are provided to interrupt tone generator operation after a predesignated time delay following each digit, and to interrupt service after each hook switch operation.
Claims29
In a telephone system including a pay station having a receiver and a transmitter coupled to a central office by a pair of line conductors through a hook switch and dialing means associated therewith, said paystation operable for initiating calls only upon the insertion therein of a coin or the like, said system including coin-free operating means for rendering said pay station operable for initiating calls without the insertion of said coin, said coin-free operating means comprising:
- first means for detecting an offhook condition of said hook switch;
- second means having at least two operating conditions, including a first condition for suppressing calls from said pay station and a reset condition for allowing calls to be transmitted from said pay station to said central office along said line conductors;
- third means for receiving inputs responsive to operation of said dialing means for preventing further dialing from said pay station to said central office after a preselected number of digits have been dialed;
- and
- fourth means coupled to said second means and responsive to detection of said offhook condition by said first means for resetting said second means to thereafter allow dialing of said preselected number of digits only after a predetermined time delay.
A telephone system including a telephone station having a receiver and a transmitter coupled to a central office by a pair of line conductors through a hook switch and dialing means, said system comprising:
- first means for detecting an off hook condition of said hook switch;
- second means for receiving inputs responsive to operation of said dialing means and for providing an output after a preselected number of digits have been dialed;
- third means for suppressing calls from said station responsive to said output from said second means;
- fourth means for generating a busy audible signal responsive to said output from said second means and for transmitting said busy audible signal to said receiver;
- and
- fifth means for suppressing operation of said fourth means until the detection of said offhook condition by said first means and initiation of said output from said second means.
In a telephone system including a pay station having a receiver and a transmitter coupled to a central office by a pair of line conductors through a hook switch and a dialing means associated therewith, said pay station operable for initiating calls only upon the insertion therein of a coin or the like, said central office requiring a signal representative of the presence of said coin in said pay station before a call from said pay station can be dialed, said system including coin-free operating means for rendering said pay station operable for initiating calls without the insertion of said coin, said coin-free operating means comprising:
- first means for detecting an offhook condition of said hook switch;
- second means having at least two operating conditions, including a first condition for suppressing calls from said pay station and a reset condition for allowing calls to be transmitted from said pay station to said central office along said line conductors;
- third means coupled to said second means and responsive to detection of said offhook condition by said first means for resetting said second means only after a predetermined time delay;
- and
- fourth means bypassing said third means for generating a coin presence signal to said central office.
In a telephone system including a pay station having a receiver and a transmitter coupled to a central office by a pair of line conductors through a hook switch and dialing means associated therewith, said pay station operable for initiating calls only upon the insertion therein of a coin or the like, said system including coin-free operating means for rendering said pay station operable for initiating calls without the insertion of said coin, said coin-free operating means comprising:
- first means for detecting an offhook condition of said hook switch;
- second means having at least two operating conditions, including a first condition for suppressing calls from said pay station and a reset condition for allowing calls to be transmitted from said pay station to said central office along said line conductors;
- third means for receiving inputs responsive to operation of said dialing means for preventing further dialing from said pay station to said central office after a preselected number of digits have been dialed;
- and wherein
- said first and third means are together coupled to said line conductors by a single wire pair through one pair of leaves of said hook switch.
Dependencies are inferred from the claim text.