SU1515393A1 - Device for limiting paid period of pay phone - Google Patents

Abstract

The invention relates to communication technology. The purpose of the invention is to increase reliability by eliminating free operation. The goal is achieved by introducing the element OR 5, the shift register 6, the trigger 7, the electronic key 10 and the thyristor 13. When the called subscriber answers, the coin previously installed in the coin acceptor fails and falls into the piggy bank. At the same time, the shunt is removed from the conversational devices of the payphone; After the tariff interval expires, relay 15 is activated and the telephone line receives a tone signal from the station g. After a certain time, relay 15 releases its contacts and removes the buzzer. If, after the expiration of the tariff interval, the coin is pre-installed in the coin acceptor, the conversation will continue without additional dialing. 1 il.

Description

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And: the invention relates to communication technology and can be used d.p. limiting the time of conversation on a payphone and can work with any type of PBX.

The purpose of the invention is to increase reliability by eliminating free operation.

The drawing shows the functional electrical circuit of the device.

The device for limiting the tariff interval of the payphone contains a block 1 connection, a talker unit 2, a shaper 3 of the account resolution, a generator of 4 pulses, an element OR 5, a shift register 6, the first 7 and the second 8 triggers, the first electronic switch 9, the additional electronic switch 10, the first relay 11, diode 12, thyristor 13, reed switch 14, second 15 and third 16 relays.

The device limiting the tariff interval of the payphone works as follows.

When servicing a real telephone line before starting to establish a connection on the second wire, the potential is +60 V, on the first wire is 60 V, on the first and second outputs of the driver, 3 levels of the log. Oh register

6, the shift is set to the zero state, the generator 4 outputs a sequence of rectangular pulses.

with frequency f, at the outputs of the first

7 and the second 8 trigger levels log. O, the electronic 9 and the additional 10 electronic keys are closed, the windings of the second 15 and third 16 relays are de-energized, the winding of the first relay P is shunted by an open diode, ohm 12, the thyristor 13 is closed, the reed switch 14 is open, the contacts of all relays are in normal condition.

In order to make a connection, the subscriber picks up the handset of the payphone and upon receiving the buzzer Answer station, dials the number. The countdown of the time when the handset is picked up does not start, since the potential at the input of the driver 3 is 60 V, which prohibits the counting. When the called subscriber answers, the telephone line is reversed, the diode 12 closes, the first relay 11 triggers, by contact it shunts the talkphone devices and opens the coin channel

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At the same time, at the reversal of the polarizer at the output of the imaging unit 3, a short-term pulse is generated, which is written to the zero bit of the shift register 6 through the OR element 5. The coin is pre-installed in the coin acceptor, fails and, passing through the coin channel, briefly1Q temporarily closes the reed switch 14 and enters the piggy bank. With the closure of the reed switch 14, the thyristor 13 opens and shunts the first relay 11, which releases and removes the shunt from spoken

15 devices of a payphone, subscribers get the opportunity to have a two-way conversation. During the tariff interval level log. 1 is moved at the outputs of the shift register 6 with the clock f tota. After a certain period of time, the level of the log. 1 enters the input of the first trigger 7 and sets it to state 1, opens the electronic key 9 and triggers the second relay 15, which closes its contacts, and the tone signal from the station generator comes to the telephone line. After a certain time (about 3 s)

30 level log. 1 appears at the output of the shift register 6 connected to another input of the first trigger 7, and sets it to state 1, the electronic key 9 closes, the relay 15 releases its contacts and removes the buzzer. Upon expiration of the tariff interval, the second trigger 8 taxically works, the additional electronic key 10 and the third relay 16, which, with its contact for a short time (0.5-1 s), terminates the loop of the telephone line, while releasing the thyristor 13, the first relay operates 11 and bypasses conversational devices such as 45 sofone. If there is a pre-installation of a coin in the coin acceptor, then the conversation will continue without additional dialing, as the next ccf, the volume of the generator is 4 log. 1 will be written through the element OR 5 into the zero bit of register 6 and will begin to advance through it. The subscriber can hang up the lever at any time, the reverse of the telephone line reversal will occur, shaper 3 will form a pulse, which will reset the shift register 6, the thyristor 13 will close and diode 12 will open 35

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The structure will go to the described initial state.

Claims (1)

Invention Formula The device for limiting the tariff interval to a payphone containing a connection unit, the first output of which is connected to the first output of the talker unit, in parallel with which the locking contact of the first relay is connected, the winding of which is connected between the second output of the talker unit and the second output of the connection unit and is diode-stitched the second output of the connection block is connected to the first output of the reed switch, the first input of the connection block is connected to the first wire of the telephone line and the input of the counting resolver, and Also connected in series is the electronic key and winding of the Btoporo relay and pulse generator, characterized in that, in order to increase reliability by eliminating unpaid work, 3 ° are inserted into it consequently, the connected OR element, the shift register, the first trigger, the additional electronic key and the winding of the third relay, as well as the thyristor connected in parallel to the diode, the control output of which is connected to the second output of the reed switch and the second trigger, whose inputs are connected to the second outputs of the shift register and the output is connected to the input of the electronic key, while the pulse generator is connected to the clock input of the shift register, the third output which is connected to the first input of the OR element, the output of which is connected to the first input of the shift register, and the second input - to the first output of the counting generator, the second output of which is connected to the second input of the shift register, the third input of which is connected via the closing contact of the second relay to the first wire telephone line as well the third relay break contact is connected in series to the second wire of the telephone line and is connected to the second input of the connection block.