DE1029420B - Number switch for telephone systems with blocking of the first digit of a telephone number - Google Patents

Description

GERMAN

For the purpose of blocking individual digits, in particular the first digit of a phone number or the Whole phone number, it is known to provide the number switch with devices that, according to Art a selector with switching arms and switching segments are formed. Such number switches are preferably used in payphones.

For individual digits of a phone number that should be blocked in the first place, such as B. 9 or 0, it is assumed that the groups of telephone numbers provided for this purpose in the exchange are free and subscriber lines are not assigned. However, it often occurs due to the different number distribution among the exchange, that the blocking also for the number 8 must be used as the first digit of the phone number. With the help of the well-known lock number switch however, only those digits that follow one another can be blocked. For example, are all To block phone numbers starting with the number 8, then those phone numbers would also be compulsorily starting with 9 and 0 are blocked. In the case of exchanges, this means that their digits 8 and 0 are only blocked need to renounce the number group 9.

This disadvantage can be avoided if number switches are used, their locking device are designed in the manner of a selector with switching arms and switching segments. It is then required to switch on only those switching segments for blocking that are to be blocked and the to leave the remaining switching segments free. In case of a Blocking the digits 8 and 0, these two switching segments were switched on while the switching segment 9 is to be left blank. One known arrangement of this type sees three such voter arms and associated switching segments, so that individual call numbers can be blocked.

However, if the task is to block only the first digit of a phone number, the known Arrangement mean a considerable effort, since the individual control members, which the switch arm Couple the number disc with its axis at the respective elevator, on the side of the number disc axis must be arranged.

The invention avoids these disadvantages and a particularly simple one which is not susceptible to failure Locking device created, which is also small in its overall height and subsequently in existing number switches can be installed. According to the invention this is achieved in that the control disk influencing the switching arm support and the intermediate member rotatably on the Number disk axis is arranged and switching

Number switch for telephone system !!

with blocking of the first digit

a phone number

Applicant:

C. Lorenz Aktiengesellschaft,

Stuttgart-Zuffenhausen,

Hellmuth-Hirth-Str. 42

Anton Lauterer, Stuttgart,
has been named as the inventor

arm support and intermediate link in the way over

a5 ratchet controls that when the dial expires after selecting the blocked first digit, the coupling of the control disk with the number disk axis is released by the intermediate member and switch arm support and intermediate member in their set Layers are locked. According to a further embodiment of the invention, the intermediate member actuated lagging by the control disk, and a locking pin of the intermediate member is only after a predetermined rotation of the pawl for coupling the control disk with the number disk axis swiveled into the area of action of this pawl while the dial is being lifted and prevents the pawl from coupling with the Dial axis. According to a further embodiment of the invention, instead of the contact segments known contact spring sets are used, each of the switch arm, which in this case is designed as a simple cam, are operated.

The invention is explained in more detail below with reference to an embodiment shown in principle in the drawing.

In the drawing, the locking device of a number switch is shown in plan view. All items not required to understand the invention are omitted. Instead of the contact segments R, 8, 9, 0, it is also possible to use known contacts which are each switched by the contact arm 7.

OT9 509/143

The switch arm support 1 and the control disk 2 are loosely rotatably arranged on the number disk axis and are moved against a spring action when the dial is lifted. He follows the selection of a locking number 8, 9 or 0, the rotatable on the control disk 2 is arranged ■ The pawl 4 is pressed into the notch of the ring or screw 3 under spring pressure. The control disk is moved in the direction of the arrow. The free end of the pawl 4 slides on the Intermediate link or ratchet 13 above or below over. By in the plane of the ratchet 13 lying further pawl 12, the ratchet 13 is rotated lagging by the pawl 12 " latches into a notch in the switch gear 13. With further Lifting the dial, the pawl 12 slides out of this notch. The column wheel 13 is held in its twisted position by the locking spring 14. With that comes the pin 15 in the swivel range of the pawl 4. When the number disk is further lifted, the approach comes 5 of the control disk 2 with the driver pin 6 of the switch arm support 1 in contact, so that from now on taken on the switch arm support 1 wkd. In this example, this is only carried out with Choice 'of the number 8, 9 or 0. However, it is also conceivable that the. Take away from a lower number can be made. After the lift has taken place, the switch arm support is held in place by the locking spring 11 held in its reached position.

When the number disk expires, the control disk 2 returns to its starting position against the Direction of arrow returned. Shortly before reaching the starting position, however, the pawl 4 also strikes its free end against the locking pin 15 of the ratchet 13, so that the control disk 2 with the ring 3 is uncoupled. This position remains until it is fully triggered, for example by hanging the handset in the fork.

Further elevations of the number disk therefore remain ineffective on the control disk 2.

The blocking of the call numbers takes place in a known manner in that, for example, the contact segments 8 and 0 are switched on, while for the freely selectable numbers, starting with the Number 9, the associated contact segment 9 is not switched on.

If a subscriber has a phone number that begins with the number 7 or a lower number, will The control disk 2 is rotated during the first lift via the pawl 4, but does not come with its approach 5 to the driver pin 6 so that the switch arm support 1 remains in its rest position. All other functions, such as B. Rotating the ratchet 13 by one step and disengaging the The pawl 4 through the locking pin 15 are also carried out here.

The arrangement is reset in a known manner, not shown, in that the locking springs 11 and 14 are released. The shift arm carrier rotated against a spring action 1 and ratchet 13 are returned to their position shown by this spring action. Included the switching arm 7 strikes against the stop pin 17.

Claims (7)

Claims ^ Ϊ. Number switch for telephone systems with blocking of the first ■ digit of a telephone number by devices that are designed in the manner of a selector with switching arms and switching segments are and their switch arm carriers are rotatably arranged on the number disk axis and from this, when the dial is lifted, it is set to the selected digit via intermediate links are, preferably for payphones, characterized in that the switch arm (1) and the intermediate member (13) influencing control disc (2) rotatable on the Dial axis is arranged and switch arm support (1) and intermediate link (13) in the Way via ratchets (4, 12) controls that, when the. Dial after choosing the locked one first digit the coupling of the control disk (1) with the number disk axis the intermediate member (13) is released and the switching arm support (1) and intermediate member (13) in their set positions can be locked. 2. Number switch according to claim 1, characterized in that the intermediate member (13) of the control disc (1) is actuated lagging such that a locking pin (15) of the intermediate member only after one. predetermined rotation of the pawl (4) during the elevator Dial is swiveled into the area of action of this pawl (4) and after If the number disk runs, another clutch of this pawl (4) with the number disk axis prevented. 3. Number switch according to claim 1 and 2, characterized in that the movable Switching elements are returned to their original positions by spring action. 4. number switch according to claim 1 to 3, characterized in that the pawl (4) the control disc (1) is disengaged by the locking pin (15) on return. 5. number switch according to claim 1 to 4, characterized in that the steps of the switch arm support (1) correspond to the selected digit and the rotation of the switch arm support (1) of the first blocking number (e.g. 8) is made. 6. number switch according to claim 1 to 5, characterized in that the switching arm (1) Contact segments are assigned that cause a blocking or keeping clear. 7. number switch according to claim 1 to 5, characterized in that instead of contact segments a common blocking contact is arranged for all blocking digits, which is connected to the switch arm support (1) attached cam is controlled. Considered publications:
German AusLegeschrift No. 1 000 872. 1 sheet of drawings © «09 509/143 4.58