US1556974A - Impulse transmitter of the dial type - Google Patents

Description

' E. TANK:

IIPULSE TRANSMITTER 0: THE DIAL rut Filed Nov. 29. 1921 Oct. 13 1925. 1,556,974

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Patented Oct. 13, 1925.

s PATENTOF 1,556,974; FICE.

'EMIL 'TANKE, or FALkENnaGr-in B/ SEEGE FELD' KREIS OSTHAVELLAND, GERMANY, ASSIGNOR TO AUTOMATIC ELECTRIC ooMrAnY, or CHICAGO, ILLINOIS, A conrom'rron or ILLINOIS.

IMrunsE TRANSMITTER-0F 'rnn bIAL TYPE.

Application mednbvember 29, 1921. Serial No. 518,723.

To all whomz't may concern: Be itknown that LEMIL TANKE, a German citizen, and resident of Falkenhagen b/Seegefeld Kreis Osthavelland, Germany, have invented certain new and useful Improvements in Impulse Transmittersofthe Dial Type, of which the following'is a specification.

Thisinvention relates in general to impulse transmitters for automatic or semiautomatic telephone systems more particularly to impulse transmitters of'the type in which suflicienttime is gained for the operation of the automatic switches between the transmission of each series ofimpulses by the provision of meansfor bridging the im' ulse springs and thereby rendering a definite number of current impulsesinefiective. The means servingfor the'bridging of the impulse springshas, so far as appli cant is aware, heretofore been influenced by a special axially displaceable spur wheel. I A material simplification of the known arrangement is provided" accordingto this invention, by causing the contact serving for bridging the impulse springs to be controlled by the same member whichis used to influence the contacts serving for controlling the line switching action.

A constructional example of the improved dial switch with the omission, however, of the parts not required for theunderstanding of the invention, is illustrated in the annexed drawing, in which Figure 1 shows a rear view of the dial switch and Figure 2 a detail thereof in lateral view. R'otatably journalled in the base platel is a shaft 2 secured to which is the number disc provided with the usrialfinger holes. Arranged,

moreover, on the shaft 2, is a disc 3 provid ed on which are cams 4: and 5. Rotatable also on the shaft 2 is a lever 6 the free end of which carries a pin and normally is in engagement with a pin 8 secured in the plate 1. The spring 10 has the tendency to draw the lever 6 towards the cam 4. The shaft 2 carries rotatably also a worm gear 11 which is provided with facial teeth 12. Engaging with these locking teeth 12 is a pawl 13 arranged on the plate 1 and adapted to counteract a rotation of the worm wheel 11 in the direction of the setting action indicated by the lower arrow. In the return movement indicated by the upper arrow the worm wheel 11 is rotated from the shaft2 by means i of intermediate mechanism not shownflf- The'worm teeth on the wheel 11 engage with a worm 16 secured on the braking shaft 14; of the centrifugal governor 15. The centrifugal governor 15 serves in a known manner for the regulation of the return movement of the finger hole dial under the in; fluence of a cocked spring. Intheposition of res t ofthe dial switch the centrifugal governor 15 is held fast by a'cam 5. v

Secured between the insulating plates 17 mounted on the base Plate 1 is a set of con tact springs. .Thisset comprises the contact springs 18, 19 for the impulse contact 20', the contact jsprings121, 22{f0r the contact 23 serving for bridging theimpulse contact 20 and the contact springs 2 1,'25, 26, control ling in a 'known manner the contacts 27 governing the line connections. Asshown in Figure .2, the contact springs 21, 22, are of angular shape so that the contact 23 is situated laterally with regard to the contacts 27. Secured to the governor shaft 141 is the wheel 28 serving forthe opening of the impulse contact 20. The transverse pin 7 on the lever 6 in the normal position of the dial switch acts on the spring 26 to hold the contact 27 open. In the normal positi'onof the dial switch the contact 23 is closed. l i l The operation of thedial switch above do scribed is as follows By the removal. of the receiver by the subscriber, thefinger hold dial is released. The subscriber commences in known manner to rotate the*finger dial down to a stop. 1 The cam4 on the disc 3 which partakes of the rotation of the finger dial, releases the lever 6:30 that the latter, under the action of the spring'lO follows the cam 4.- until the, pin 7 of the lever 6 encounters the abutmentt). At the commencement of the movement of the lever 6, the pin 7 releases the contact spring 26 whereby the contacts 27 for the line are closed. At the end of the movement of the lever 6 the pin 7 acts against the contact spring 21, thereby opening the contact 23, bridging the impulse contact 20. In addi tion, the cam 5 on the disc 3 releases the brake 15.

7 Now when the subscriber releases the finger dial, the latter, under the action of turn motion of the finger dial.

moment in which the finger dial hasimovedf interrupted once so that the impulses are produced from the commencement of the re- At: the

back so far that the cam 4 on the disc 3 con nected thereto engages and moves along the lever 6, resting. against the abutment 9, the contact spring 21 is released from the pin 7, and consequently the contact 23 is closed. As the contact 23 is connected in parallel; with the impulse contact 20, the interruptions of the impulse contact elfected; during.

the remainder ot the return of the disc 3,

in which the lever 6 is moved; to its initial position, are ineffective. At the end ot the return movement of the lever 6 to the initial;

position, the contacts 27 are opened by the v pin 7 striking against spring 26: and the position of rest is reestablished.

By combining thecontact springs 18, 19, 21, 22 and:2 l 26 to a set, separate connections between the individual contact springs are, rendered superfluous.

What I claim and desire to, Letters Patent is i l 1. In an impulse sending device, a finger hold dial, impulse springs, springs for short circuiting said impulse springs, other springs for short circuiti'ng substation apparatus, and a common member controlled by said protect bydial for directly operating both sets of said short circuiting. springs,

2. In an impulse sending device, interrupter springs, a pair of springs for short circuiting said interrupter springs, other springs, and a single means for: operating. said: other springs during both the setting and impulse transmittin-g'operation of said device and for operating said short ci,r-

cuiting'springs only during the initial part, of the setting operation and: the final part of the impulse transmitting operation.

3. In an impulse sending device, interrupter springs, a pair of springs for short circuiting said mterrupter springs, other springs, and a single means for operating said other springs during both the. setting and impulse transmitting operation of said device and for opening. said short circuiting springs. upon the initial part; of the setting operation and only closing said springs during he ina part 013 th mpulse tran mitng opera ion 4'. In an impnlse sender having forward and backward movement, means for sending impulses on. the backward movement, contacts closed during the forward and backward movement of the sender and other contacts closed only during a portion of the backward movement to render the. impulse sending means ineffective, and. a single member for operating both sets oli contacts.

5. In an impulse transmitting device, interrupter-springs,a pair of springs for short oircuitingsaidinterrupter springs, and. means for rendering the said last springs effective during the final of a plurality of operations 0t said; impulse springs.

6. In, an impulse transmitting device, impulse springs, means. for operating said springs a. plurality of times each time the. device is operated to transmit one or more impulses, andmeans rendered effective just. prior to the final operation of said springs to render such= operation ineffective so. far as the transmission of an impulse is, con-' cerned. In an impulse transmitting device, im'- pulse springs, means for operating said springs a plurality of times each time the. device is operated; to transmit one or more impulses, and. means rendered efi ective just priorto the final operation of said; springs to. render such operationinefi'ective I Ov ar as the transmission of an impulse. is con,-, cerned,the's,aid means comprising a pair of springs connected in multiple with said interrupter springs. v

8. In an. impulse transmitting device, impulse springs, a cam for separating said springs a plurality of times each time the, device. is operated, and means for maintain-H ingsaid; springs electrically con'nectedduring their final separation.

9. an impulse transmitter, a finger-hold dial, subscriber controlled mechanism for producing series of interruptions in the line circuit, an automatiodevice for rendering the last interruption of every, series ineffective, said device comprising a pair olshunt springs and a belloranklever for operating them, and means controlled by the said dial for operating said lever.

EMIL TANKE... 1

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