US1133796A - Telephone-exchange-system impulse-transmitter. - Google Patents

Description

J. ERICKSOM TELEPHONE EXCHANGE SYSTEM IMPULSE TRANSMITTER.

APPLLUATION FILED JUNE 14, 1909 RENEWED MAY 13, 1912.

Patented Mar. 80, 1915.

2 SHEETS-SHEET 1.

Wafrz 855 635 4 JM'M/ JOHN ERICKSON, '3 CHICAGO, ILLINOIS, ASSIGNQFZ. TO AUTOMATIC- ELECTRIC SCLZEAIPL 9F CHICAGO, ILLINOIS, A COR-EORATICN SF ILLINOIS.

TELEPHGNE-EXCHANGE-SYSTEM IMPULSE-TRANSMITTER.

Specification of Letters ratent.

Patented Mar, 3% 1M Application filed June 14, 1909, Serial No. 501,973. Renewed May 13, 1912. Serial. No. 897,079.

To all 'ur/aim. it 'i/MU/ 0071a. 22

Be it known that I, Join iliiicnsow, a 4

citizen of the United States of America, and resident or" Chicago, Cool: county, Illinois, have invented a certain new and useful improvement in Telephone-Exchauge-System Impulse-Transmitters, of which the following is a specification.

My invention contemplates an electriral impulsetransniitter, such as those used in automatic telephone exchange systems, comprisiug' a hack and forth rotary dial for operating the make-and-hreal; mechanism, and means for holding the dial locked in any position to which it advanced, together with means for releasing the malte-and-break mechanism by a slight backward movement of the dial, whereby the impulse wheel of the make-and-breal; mechanism rotates back to normal position while the dial remains locked in its advanced position, after which the dial. returns to normal position. By thus holding the dial lockedwl1ile the impulses are being transmitted the operation cannot be interfered with, as by undue acceleration. of the dial, and thus the proper transmission of the impulses is insured, together with the desired operation of the switches at the central station.

in impulse mechanism characterized by my invention is applicable to a three-wire system, and is also applicable to a two-wire system, being especially advantageous in the latter, because of-the importance in a twowire system of precluding interference with the transmission of the impulses by the call ing subscriber.

In the accompanying drawings Figure. l is a rear elevation of an impulse-transmit ting mecaanism embodying the principles of my invention. Fig. 2 is a vertical section on line L-- in Fig. 1. Fig. 3 is a VlGW similar to Fig/i, but showing certain portions of the structure broken away to bring other oleine-nts into view. Fig at is a front elevation of the said mechanism, with the dial removed and with certain other portions broken away, showing the mechanism in normal position-that is to say, normal except for the removal of the receiver from the switch hook, which serves to unlock the dial. Fig. is a View similar to Fig. -l, showing the positions of certain elements when the dial is rotated or advanced from its normal position. Fig. 6 is a detail frog- 1. At ts forward end said shaft is pro mentary perspective view of the malts-andbreak device. Figs. 7 and 8 are in the nature of diagrams illustrating the operation of the said makeaml-hrealt device.

As thus illustrated my invention com- 6 prises a frame A. of the usual or any suitable shape, which is rigidly connected with the frontplate a. The shaft B extends centrally through the said frame andfront plate, and is controlled at its rear end by a spring Z), which latter has its outer end secured to the frame at Z1, and .its inner end suitably secured to the said shaft at 7%, in the manner shown more clearly in F videith a hub b that turns or rotates in the plate a, and which serves to rigidly con-" nect the said shaft with the plate or wheel C. The dial D, which is of the usual pattern or design, is pivoted uponfa frame (Z secured to the front of the plate a, so that it rotates about an axis coincident with the axis of the said shaft. 3; spring d is ap plied "to the central portion of the said dial to return the same, to normal position. The said dial is provided on its under surface with a pivoted dog E, which latter has one portion (2 adapted to engage a notch or tooth c on the wheel C, and another portion a adapted to engage between two portions 6* carried on an arm e This arm 0 is rigid with and projects from one side of the ratchet wheel which latter is mounted to turn loosely/upon the hub o The said ratchet wheel also has a lug f adapted to he engaged by {ly'SliOUltlBl f on the hack of the arm? of the dog. when the dial is permitted to ,ret'urnto normal position, as will here inaftcr more fully appear. The wheel C is provided with a cam portion c for restor- 9 ing the portion c to engagement with the notch or tooth 0 upon the restoration of the mechanism to normal position. The said wheel C is also provided with a projecting portion 1 adapted to he engaged by the dog G operated by the switch hook H. This dog G engages the portion 4*, when the receiver is on the hook, to lock the dial D against rotation. it dog I pivoted on the frame (5 provided with a tooth i to engage the teeth of the ratchet, wheel F, and with a projecting end portion 2" adapted to engage the cam portion 0 of the wheel tion, whereby the said c adapted tog is disengaged from the ratchet wheel to allow the latter and the impulse wheel J to return in unison to normal position. This impulse wheel is provided with teeth y, and is rigidly connected with the hub 79 and with the wheel (I,

whereby they all move in unison. These teeth are adapted to engage the spring K when the dial is rotated forward, in the manner shown in Fig. 7, the said teeth riding over the said spring, whereby the two normally closed springs y" and j ofthe line circuit are not opened. When the said wheel is allowed to rotate back'to its normal position, then these teeth slide over the spring K and thus open the two springs j and 7' in the manner shown in Fig. 8, It is the opening and closing OI these springs j and 7' that causes the transmission of the impulses in the line of the calling subscriber,

whereby the automatic switches are operated at the central station. It will be understood that this make-and-break device is suitable for a two-wire system-that is to say, a system in which there are no operating grounds at the subscribers stations.

"When the receiver is removed from the switch hook H the dog G disengages the portion 0 thereby unlocking the dial and placing the same in readiness to be rotated When the dial is rotated in the direction indicated by the arrow in Fig. 1, the wheel O is rotated by the hook-shaped portion e, and the ratchet wheel F is rotated by the portion e, inasmuch as the latter engages the outer end of the arm 6 in the .manner explained. The dial is rotated forward in accordance with the particular digit of the called number, and the dog 2' then, locks the ratchet wheel F such position, holdipg the dial in the same position. The pivotal motion of the dog E, however, permits the dial to rotate backward slightly, and this is sufiicient to throw the portion 0 out of engagement with the tooth or'notch 0, by reason of the relative movement between the dial and the ratchet wheel F. In other words, this slight backward movement of the dial causes the portion 6 to lift the portion e out of engagement with the wheel (J, the spring 0 supplying the requisite propelling power for this purpose. As soon as the wheel C is released, then the shaft B and the impulse wheel J rotate back to normal position, operating the impulse springs and transmitting the impulses during the backward rotation. When the cam c engages the portion 2" of the dog I, then the ratchet wheel F is disengaged, and in this way the said ratchet wheel and dial D are automatically released and allowed to return to normal position. Obviously, though, the dial is locked against motion during the backward rotation of the impulse wheel J and during the transmission of the impulses. When the portion 6 engages the is removed, as shown in Figs. at and 5. This i disengages the dog G from the portion 0 and thereby unlocks the dial in the manner explained. When the receiver is replaced upon the hook, then the lug h is disengaged from the dog G, and the latter is returned to no: nal position by the spring 9, whereby the dial is normally locked againstrotation.

Thus it will be seen that I provide an im proved impulse-transmitting mechanism of such character that the dial, although of that type in which backward rotation thereof is incidental to the use of the same for calling, cannot be forced or operated in such manner'as'to interfere with the proper transmission of the impulses. The dial is absolutely locked against motion while the impulses are.being transmitted, which is important in systems of this character, and especially advantageous in a two-wire systemthat is to say, a system in which the switches at the central station are controlled over the two sides of the line circuit in series.

I have found that in a system of this kind it is particularly important that the impulses be transmitted properly and without any improper acceleration of the impulse wheel during its return to normal position. Furthcrmore, as explained, the dial is locked against motion while the receiver is on the hook.

lVhat I claimas my-inyention is 1. A telephone exchangdsystem impulse transmitter comprising a dial, an impulse wheel, means for returning the wheel to normal position, means for holding the dial locked in its advanced position, means @for releasing the dial when the wheel reaches its normal position, and means for returning the dial tomormal.

2. A telc'phone eschange system impulse transmitter comprising a dial,'an impulse wheel, spring means for returning said dial and wheel to normal position, and means whereby the wheel returns first and the dial afterward.

3. A'telephone exchange system impulse transmitter comprising a dial, an impulse device, spring means for operating said device and returning said dial to normal position, means for releasing the device by slight backward movement of the dia1, means for holdin the dial against movement While the device is sending the impulses, and means for releasing the dial when the device is through sending the impulses.

e. In a telephone system, a suloscribefs calling dial, an impulse wheel, means for returning the wheel to normal position, means for holding the dial locked in'its advanced position, for releasing the dial when the wheel reaches its normal position, means for returning the dial to normal, and means for normally locking the dial against rotation.

5. In a telephone system, a su-bscrihers calling dial, an impulse wheel, spring means for returning said dial and wheel to normal position, means whereby the wheel returns 7 first and the dial afterward, and means for normally locking the dial a ainst rotation.

6. In a telephone system, a subscribers calling dial, an impulse device, spring means for operating the impulse de ice and returm ing the ial to normal position, means for holding the dial against movement while the device is sending the impulses, and means for normally locking the dial against rotation.

7. In a telephone system, a suhscrihers calling dial, an impulse device, spring means for operating said device and returning said dial to normal position, means for releasing the device by slight backward movement of the dial, means for holding the dial against movement while the device is sending the impulses, means for releasing the dial when the device is through sending the impulses, and means for normally locking the dial against rotation.

8. In a telephone system, a subscribers calling dial, spring means for returning the dial to normal position, a ratchet device for holding the dial against inovement while the impulses are being transmitted, and

means for norn'ially locking thedial against rotation.

J. in a tvvo\vire telephone exchange systerm, a ailing dial therefor, an impulse wheel, means for returning the wheel to normal position, means ior holding the dial locked in Its advanced posltion, means tor -'r leasing the dial when the wheel reaches its normal position, means for returning the dial to normal, and normally closed line sprlngs adapted to be opened and closed to transmit the impulses.

11. In a two-Wire telephone exchange systcm, a calling dial therefor, an impulse vice, spring means for operating the impi Ase device and returning the dial to normal position, means for holding the dial against movement. while the device is sending the impulses, and normally closed line springs adapted to he opened and closed to transmit the impulses. I v

12. in a two-wire telephone exchange system, a calling dial therefor, an impulse device, spring means for operating said device and returning said dial to normal position,

4: i-.,,,: means lor releasing the device of, sllgnt backward movement of the dial, means for holding the dial against movement while the device is sending the impulse, scans for releasing the dial when the device is through sending the impulses, and normally closed line springs adapted to he opened and closed to transmit the impulses,

13. In a two-wire telephone exchange systern, a calling dial therefor, spring means for returning the dial to normal position, ratchet device for holding the dial against movement while the impulses are being transmitted, and normally closed line springs adapted to be opened and closed to transmit the impulses.

It. In telephone system, a calling device having a reciprocating operating dial, a reciprocating impulse wheel, and means whereby said dial and wheel operate indepen dently and sin'iultaneously:

15. In a telephone system, a calling device comprising are'ciprocating dial, a reciprocating impulse wheel, means for operating said dial and wheel independently and simultaneously, and means for holding said dial against movement while said impulse .wheel is sending the impulses,

Signed by me at Chicago, Cook county, llliuois, this 10 day of June, 1909.

l JOHN ERICKSON.

Witnesses EDWARD D. FALES, i-UITHUR J. RAY.

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