US1992389A - Selector arrangement for the selective call of telephone subscriber stations for the private and official exchange - Google Patents

Description

Feb. 26, 1935. Q MOSER 1,992,389

SELECTOR ARRANGEMENT FOR THE SELECTIVE CALL OF TELEPHONE SUBSCRIBER STATIONS FOR THE PRIVATE AND OFFICIAL EXCHANGE Filed March 29, 1954 2 Sheets-Sheet 1 Fig.1.

T 1 In 12345628910 N Wi Off? /70 5e? Feb, 26, 1935.

0 MOSER SELECTOR ARRANGEMENT FOR THE SELECTIVE CALL OF TELEPHONE SUBSCRIBER STATIONS FOR THE PRIVATE AND OFFICIAL EXCHANGE Filed March 29, 1954 2 Sheets-Sheet 2 Patented Feb. 26, 1935 a 1,992,389

UNITED STATES PATENT OFFICE SEIJECTGR ARRANGEMENT FOR THE SE- IBECTWE CALL. OF TELEPHONE 'SUB- JSQRIBER STATIONS .FOR THE PRIVATE AND OFFICIAL EXCHANGE Otto Moser, Bern,.'S witzerland Application- March v29, 1934, Serial No. 718,056 I lnswitzerland March29, 1.933

'1 Claim. (01. 179-16) The present invention relates to a selector artion is equipped with a small rotary selector W 'rangement for a direct call telephone system. similar to those used in connection with auto- .In direct call telephone systems push button matic telephone systems. line finder devices have been employed for many The selector is operated by the finger disc N.

= years. These :are subscribers-instruments which, When the number 1 is dialled on the finger disc, ,5 as expressed by their .name, are equipped with i the contact arms .of the selector will move to the push button switches which render it possible position 1; if the number 2 is dialled the contact to call and to speak to any subscribers station arms of the selector will execute two steps and of the system by pressing on the respective press so on. In this manner the connection with the 1.0 (button. desired'station will be .establishedover the various Eyery'single subscribers instrument must be lines connecting the individual subscribers inprovided with so many push button switches as struments. But since the finger disc N is also there are stations which wish to be able to call needed for establishing connection with the pubone. another directly. If the system has five lic system, if this is of the automatic exchange 35 such stations there must'be providedfor each subtype, the coupling K between the finger disc and vscribers instrument fiveswitchesandten switches the selector is arranged to be cut out, when an if there are ten stations and so on. i If the system exchange key Ais operated. The contact brushes "is connected to a public telephone .system as "is of the selector at'the subscribers station will not common to-day, the instrumentsare ,providedin then be advanced but will remain in the position addition according to the number of service conof rest. It may now become necessary to speak 20 nections with one, two, threeormorepush button :with the internal stationsof the direct call sysswitches for making connection with the external tem whilst external calls are being sent or reexchange. If theexternal exchange is automatic ceived. For thispurpose the coupling K between there must be added also the rotary selectors. the finger disc and the selector is re-inserted as Therefore, on such line finder instruments, three soon as the exchange key is brought into a hold- 25 different kinds of switches are present; the push ing position, i. e., a position in which internal button switches for the direct call system, the calls may be made without disconnecting the inpush button switches for making connection with strument from the exchange. In order to permit the external exchange and the rotary selectors. the operator to make any number of internal calls The operation of the instruments is, therefore, in this position of the exchange key the contact 30 tedious and the manufacture thereof is expensive. brushes of the selector are arranged to return To simplify matters special push button switches, to their position of rest each time the finger disc mechanically-coupled together have been prois operated for an internal call. vided and to reduce the manufacturing costs es- The manner in which these various operating pecially in recent years it has been endeavoured conditions are attained willbe seen from Figures 35 to construct switches as compactly and cheaply 2 and 3. The finger disc N is coupled with the line as possible. The number of push buttons has, finder system by means of the two pins b1 and b2 however, remained the same and, in spite of all of the coupling wheel. Ba. When the telephone improvements, in order to locate these buttons is put down at rest a button HU presses through it is still necessary to construct apparatus varythe intermediary of a lever A upon a pawl C ing in size and arrangement according to the secured to the coupling wheel Ba, so that this number of connections of the line finder system. pawl, when the finger disc turns the wheel Ba The present invention provides a system in coupled therewith, will pass a pin D provided on which the push button switches for permitting an inner coupling wheel B1.

direct calls are rendered unnecessary. The only The rotary selector will, therefore, remain in switches necessary are those for the external its position of rest if the finger disc is operated exchange. The whole line finder mechanismmay with the telephone on its hook. If the telephone be located in the casing of a normal subscribers is removed the lever A is withdrawn from the telephone instrument. Theinternal construction pawl C by the spring L and this pawl is moved of the instruments has been simplified and the inwardsby spring E. As soon as the finger disc 50 operation of the switches improved. is operated the pawl C pushes against the pin The invention is illustrated by way of example D so that the inner wheel B1 is also rotated and in the accompanying drawings in which Fig. 1 in turn rotates the wheel W of the rotary selecillustrates diagrammaticallya direct call system tor. The selector brushes W1, W2, W3 will, ac-

5 embodying the invention. Each subscribers stacording to the number dialled on the finger disc,

be adjusted to the contacts 1, 2, 3 etc. on the selector contact bank M and thereby to the line of the selected subscribers station. The desired connection is thus established. Upon the return of the finger disc the wheel Ba will return into its position of rest. If, at the end of the conversation, the telephone is replaced a pawl S will be withdrawn from the teeth of the wheel W by means of an auxiliary arm F of the lever and the wheel W and the brushes will be moved back into rest position by a spring 0.

It is also possible to make a number of internal calls successively without replacing the telephone each time. When the finger disc is again operated at the beginning of the rotary movement, the resilient mask Q causes the coupling K to be pressed against the arm F which will withdraw the pawl S from the teeth of the wheel W and the selector will turn as described into the position of rest. When the dialling is continued the selector brushes will again be adjusted according to the number dialled and soon.

For establishing or answering an external call an exchange key has to be operated. This moves levers X and G so that the latter presses against a pin J causing lever A to be pressed against the pawl C and the selector remains in the position of rest.

If in connection with the external call an internal station has'to be called the holding key has to be operated. The exchange key will be are three exchange'keys each of which is connected to the external exchange.

To call the exchange an unoccupied key P is pressed down to position Z and if it is desired to make an internal call without disconnecting from the exchange the key V is then pressed. down. This will cause'the key P to be raised to the position Y. This movement of the key P is transmitted by lever X to lever G so that the lever F is released as above described and a number of internal calls may be made. Whilst the key P is in the position Y it will maintain the connection to the exchange but without transmitting the internal conversation to the exchange.

To continue the conversation with the exchange, key P is again pressed down into position Z. When the telephone is replaced the key P will return to its original position.

I claim:

In a selector arrangement for a direct call telephone system, where a' dialling mechanism may be selectively connected for internal and external exchanges and in combination, a telephone rest arranged as a push button, a dialling mechanism comprising a driving shaft and a coupling disk having coupling pins and fast to this shaft, a finger disk coupled to said shaft by said pins, a gear provided witha carrier pin loose on said shaft and a spring controlled pawl fast to said coupling disk and adapted to be engaged with said carrier pin, a line finder mechanism comprising a spring controlledauxiliary shaft, a toothed selector wheel meshing with the gear on the driving shaft and selector brushes both fast to this shaft and contact banks in reach of said brushes, external exchange keys and a holding and counter question key and a lever arrangement adapted to establish the operating positions of the line finder mechanism .for the diiierent positions of the exchange keys.

- OTTO MOSER.

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