DE2938590A1 - Coin operated telephone with keyboard selection - has memory and switch for automatic re-selection of stored number, which was previously e.g. engaged - Google Patents

Abstract

The keyboard (T) is connected to the number impulse transmitter (W), and to a memory (SP). If the call fails to connect, a push button (ZI) on the keyboard can be operated to disconnect the line without causing the automatic return of coins already placed in the instrument. Release of the button (ZT) reconnects the line and, after a short time delay (VS), initiates read out of the stored number to the impulse transmitter. Alternatively the number reconnection may be initiated by the caller pressing the button (ZT) a second time. The memory is cleared by replacing the hand set in the cradle.

Description

Circuit arrangement for a subscriber pay phone

apparatus The invention relates to a circuit arrangement for a Subscriber coin-operated telephone set with a dialing pulse generator that can be controlled by a dialing keypad.

It is known that in technically complex telephone sets, E.g. at the new world coins of the Deutsche Bundespost, one that can be operated by the speaking guest Key is present, which as a so-called re-selection key makes it easier to use in such a way that, for example, if the participant is found to be busy, the loop separation by pressing this key is carried out in such a way that, in contrast to the means of Hook switch, loop separation, emptying of the coin storage does not occur takes place and thus the following election attempt without the otherwise necessary removal of the Money from the return cup and throwing it in again is possible. This so-called A redial button is also on the payphone for other events usable, E.g. for the utilization of unused remaining amounts of higher value coins for follow-up discussions, for canceling a dialing made with a phone number recognized as being wrong, for the Ending a conversation that was only made with higher-value coins in order to subsequently receive the Refill the coin store with low-value coins so that when it is subsequently hung up of the handset the previously opened higher-value coin is returned.

The object of the present invention is to provide a circuit arrangement of the type mentioned for subscriber payphones to indicate that for the user of such a telephone set also considerable ease of use and which is characterized by a simple structure.

This object is achieved according to the invention in that a redial memory and an additional key are provided that after an unsuccessful connection attempt by pressing the additional key, the existing connection is released and at the same time Emptying of the coin store is prevented, and that when the additional button is released a new assignment takes place and then the previously entered phone number is sent again.

The advantage achieved by the invention is that in subscriber mini-telephone sets a connection that has to be repeated, e.g. when a subscriber is busy, in the type is simplified that the connection is released by pressing only one button but the money in the coin store is kept there and that the Sending the previously dialed number after recovery the Participant loop takes place automatically. In contrast to the technically complex ones The circuit arrangement according to the invention is distinguished by coin-operated telephones of a general type for subscriber pay telephones by a simple structure, because of the concept utilizing the remaining amounts of higher value coins and replenishing the memory to return higher value coins is not possible, as only one Coin type is provided.

An expedient further development of the circuit arrangement according to the invention is characterized by the fact that a new assignment is made when the additional key is released takes place, but the previously entered phone number is only sent out when the additional key is pressed the second time. This gives the speaking guest the opportunity to wait for the dial tone to sound and only then press a second time the additional button to start the transmission of the dialing impulses.

Further useful refinements of the circuit arrangement according to the invention result from the subclaims and from the description of an exemplary embodiment of the invention based on a figure.

In the embodiment of the invention shown in the figure are only the components of a subscriber pay phone set necessary to understand the invention shown, namely a keyboard T, an additional key ZT, a dial pulse generator W, a memory SP, a delay circuit VS, an occupancy device BL and a cashier KV.

On the special coin-specific details of the circuit arrangement shown shouldn't be closer here are accepted as they are known to the person skilled in the art should be. The number entered using the keypad T is both the dial pulse generator W as well as the memory SP supplied. The respective election impulses, which are transmitted appear at output A of the dial pulse generator W. If the Subscriber now to an occupied subscriber, he can press the additional key ZT. As a result of this actuation, the connection is established by the occupancy device BL triggered and there is also a new one via the occupancy device BL Incentive to occupy an electoral admission rate. At the same time is in the cashier prevents emptying of the coin store. The delay circuit VS provides for a time delay of e.g. a few seconds between a new line seizure and the transmission of the dialing pulses in order to ensure that the dialing is safely recorded in the exchange to reach.

Depending on whether for redialing with a simple keystroke or with a double key press is the input of the memory SP wired for the signal of the additional key ZT. The solution with a double Press a button for redialing and a single button press for sole loop separation lets through the option of canceling dialing and redialing another number respectively.

after pressing the button once.

The occupancy device BL also recognizes when the call ended by hanging up the handset. In this case, the occupancy facility BL gives a signal to the memory SP, which causes the memory contents to be deleted.

Used as a keypad for the subscriber's pay phone apparatus If a conventional keypad with 12 keys is used, it can be used as an additional key one of the two unused buttons can be used.

5 claims 1 figure L e r s e i t e

Claims (5)

Claims i. Circuit arrangement for a subscriber pay phone with a dial pulse generator controllable by a dial pad, d a d u r c h g e -n e n e n n e i t that a redial memory (SP) and an additional key (ZT) are provided that after an unsuccessful connection attempt by pressing the additional key (ZT) triggers the existing connection and empties at the same time of the coin storage is prevented and that when the additional button (ZT) is released, a reassignment takes place and then the previously entered phone number again is sent out. 2. Circuit arrangement according to claim 1, d a d u r c h g e k e n n shows that a new assignment takes place when the additional key is released, the previously entered phone number is only sent out when the additional key (ZT) is pressed for the second time. 3. Circuit arrangement according to claim 1 or 2, d a -d u r c h g e no indication that between the renewed line seizure and the transmission a time delay is provided for the dialing pulses. 4. Circuit arrangement according to one of the preceding claims, d a d u r c h e k e n n n z e i c h n e t that the data stored in the redial memory (SP) stored number is deleted when the handset is hung up. 5. Circuit arrangement according to one of the preceding claims, d a d u r c h g e k e n n n z e i c h n e t, that as an additional key (ZT) one of the two unused keys (* or #) on the keypad is used.