US1615311A - Impulse-sending device - Google Patents

Description

Jan. 2 19 -5 27 H.`F. OBERGFELL IMPULSE SENDING DEVICE Filed Dec. 10, 1923 Patented Jan. 25, 1927.

UNITED STATES urATENT OFFICE.

HERBERT E. OBERGEELL, E RIVER EoREsT, ILLINOIS, AssIGNoR, EY MEsNE ASSIGN- MENTS, To AUTOMATIC ELECTRIC INC., or CHICAGO, ILLINOIS, A CoRroRATIon' 0l' DELAWARE.

IMPULSE-SENDING DEVICE.

Application tiled December 10, 1923. Serial No. 679,517.

My invention relates in general to impulse Agovernor are driven from the dial by means.v

of appropriate gear transmission. In these devices, and particularly when, as in the present instance, they are constructed in the form of a calling device for4 automatic telephone systems, many efforts have been made and various means devised to' prevent sticking and reduce binding and abrasion between gears.

The principal object of the invention is to provide an improved mechanism for accomplishing the above results. I have discovered that by the use of a laminated worm gear consisting of a blank or layer of black bre, or other suitable oil holding material, held between two phosphor bronze. vflanges or disks, I am able to practically entirely eliminate sticking and to reduce binding and abrasion to nilfor all practical purposes.

Other new and improved4 features in the governor mechanism include a new and improved type spring in which the material -used in fastening it 'to the worm shaft is new and improved, thus eliminating the previously used aluminum hub and practicallyeliminating breakage; a new and improved type of governor fly-ball in which a piece of a grayber rod, or other suitable bearing material, is rounded off and inserted in the iy-balls to 'serve a's a friction shoe and thus reduce abrasion between the fly-balls and governor cup; and a new and improved Atypebearing in which the material is hardened steel and the design yused to hold the parts in place is new and improved. This type bearing overcomes the objection to the-'previously used' jeweled bearings, 1. e.,

are generated by the actionl of an interused is phosphor bronze, and the design.

of not having a convenient method of deter-f play or pulling out distance -of the dial, and

holding the new shunt spring controlling lever, so as to give a strongerand more reliable mechanism and one more easily adjusted, assembled and put into operating position.

Still another feature is the newy and improved means of attaching a telephone number and letter designation, or instruction card, to the dial, so as to economically make changes when necessary.

Certain of the foregoing features disclosed in this case are being claimed in the copendin'g divisional application-Serial No. 53,039, filed August 28, 1925. f The above important features of the invention and other details will nowl be more4 fully described in the'specitcation which is lto follow, reference being had to the accompanying drawing, in which Fig. 1 is a front view ofthe device; Fig. 2. is a side view of the same, looking in the direction of the arrow in Fig. 1, with one of the mounting The impulse sending device illustrated comprises the usual finger hold dial 2 (as shown in Figs. 1 and 2) pivoted'at a centraf point in the base plate 3 (Figs. 1, 2 and 3) by means of a rod and having a coil main spring 4, one end of which is fastened to' the rod or pin 5` to which lthe finger hold dial is fastened and which acts as a pivot for ysaid dial, .and the other end of which is y fastened to a lug6 on the under side of the base plate'.. The spring 4 acts'ptoreturn the linger hold dial 2 to its normal position after the spring has been wound up by the rotation of the dial in a clockwise direc-W tion. A gear wheel is mountedloosely upon thepivot rod 5 between the dial and the plate 3, as shown, for example, in U. S. Letters Patent No. 1,461,944 to Setter, dated July 17, 1923,4 which wheel has gear teeth around its circumference and also has ratchet teeth cut in its face lying adjacent to the dial 2. These ratchet teeth are spaced apart the same angular distance as the holes in the linger dial. Through an o ening in the dial 2 1s placed a small metal og which cooperates withthe ratchet teeth on the gear v wheel to rotate the latter with the finger hold dial in its return or counter-clockwise motion only until the dial reaches normal.

g Figs. 2 and 3, having two wings adapted,

when the shaft is rotated, to open and close contact of a pair of springs 11 and 12, which are usually used to send impulses over the well known two wires of a telephone system to control automatic switches. The worm wheel 9, as best shown in Fig. 7, consists of a blank or sheet of black fibre held between two sheet phosphor bronze flanges, all of which are punched out and driven on a shoulder of the pinion. shaft. The shoulder has a flat surface cut on it to keep the wheel from turning and is tapered so that the wheel becomes held more secure as it is driven on. The projecting shoulder is then staked to hold the wheel in position. Teeth are then cut on the bias to mesh with the governor worm 13, as best shown in Fig. 3, which drives'the governor in the usual well known manner.

The governor consists of the hardened steel worm shaft 13, as best shown in Fig. 5,' which shaft is knurle'd to cause a tight iit of the round brass hub'20. The shaft is also attened at its ends and polished to bear against the hardened and polished chrome steel ball bearings 21 and 22. The ball bearing 21 receives very little wear and hence is merely driven tightly in place, while ball bearin 22 receives a thrust when the worm shaft ls'rotated and is therefore arranged as follows: In the screw end of the governor cup 23 is a hardened steel polished concave race 24, which is held stationary. The ball bearing 22 is smaller than thebore of the screw end of the governor cup and, is held loosely in place by the round brassr bushing 25 which is held stationary and has its bearing end slightly bent into a diameter less than that of the steel ball.'v The hub 20 has a collar` at one end. over which the phosphor bronze spilling 26 is tightly fitted by forming a cup.

e spring is'further held by prong staking or rivetino' the collar vof the hub which extends sliglitlybeyond it,"while the hub is further tightened to the shaft by ring staking the end opposite the collar. To the ends of the governor spring 26 are riveted round brass governor fly-balls 27 and 28. These fly-balls are drilled out and in them are inserted conicalishaped fibre friction shoes 29 and 30 which have their tops out oil and rounded, and are held securely in place by vring shoulder staking.

Three springs, 14, l5 and 16, as shown in Figs. 2 and 3.', are provided and are what is known as the shunt springs; that is, these springs are allowed to close by bushing 17 as soon as the calling device leaves its normal position and are used to shunt the talking equipment at a subscribersl station in the usual well known manner. The bushing 17 is held on the end of the hard sheet brass shunt spring lever 108, as shown in Figs. 2, 3 and 6, by nicking the latter. The lever 18 (Fig. 6), iits over the collar on the top end of the hub 19, after the end of the main spring 4 has been placed in the groove which extends slightly below said collar, its inner projectionsitting in said groove thus holding the main spring in place and keeping the hub from turning with respect to it. The top of the collar is then curled over or riveted to hold the lever securely in place.

The hub 19 is of sufficient length to almost touch against the stationary hub (not shown) of the base plate 3, which holds the rod or pin 5, and thus limit the distance the dial 2 can be pulled out with the spring in place. The bottom end of the hub is tapered Iso as to accommodate the decreasing dia' meter at the middle of the coil spring 4 as it is wound up or tensioned.

A dial instruction card 38, as best shown in Fig. 1, is mounted on the face of the dial 2 as follows: The dial escutcheon plate or badapter 31, as shown in Fig. 4, is made from soft sheet brass, or other suitable material, and has its edge turned over so as to rest securely on the face of the dial. It has a lowered bearing surface 32 and a lowered screw hole 33, vthe surface leading down to the latter being shaped to accommodate the head 'of the screw 37, which screw fastens the plate to the dial. The plate further has a projection 34 which fits into the hole 50 of the dial and holds it from turning, and cut out portions 35 and 36 to function with the dial escutcheon or cover ring 41 as will be explained later. The dial instruction card 38, made of white index bristol, or other suitable material, 4lies on top of the escutcheon' plate 31 and has a projection 39 to function with the cover ring 41 as will also be explained later. The transparent Celluloid cover 40 lies on topl of the instruction card 38 and both are covered and held in place by the ring 41. The ring-4,1 is made from BOP llti

. normal wheel or other suitable material, and has its edge turned over to lit the escutcheon plate 31, the slight projections 42 and 43 being bent in to snap into 'place and mesh with the cut out portions 35 and 36, respectively, of the late 31. ,The cut out portion 44 accommoc ates the projection 39 of the card 38 and keeps the card from turning as wellA as positions it with respect to the dial.4

The operation of the device is as follows: In the well known manner the user of the device places his finger in the hole, through which can be seen the desired digit, of the finger hold dial 2, and pulls the dial around in a clock-wise direction until the finger has encountered the stop 51, shown 1n Figs. 1, 2 and 3,'at which time the finger is withdrawn. As previously pointed out, the associated gears do not move during this tension is storedv in the main and the shunt springs4 are closed by the movement of lever-18. lVhen the linger is withdrawn the spring 4 exerts a force upon the dial 2 and rotates same back toward its position, causing the associated gea-r (not shown) and pinion 7 to rotate with it. The shaft of pinion 7 thereby rosoft sheet brass,

tates the cam 10 to cause thesprings l1 and 12 to be separated momentarily a ndniber of times corresponding to the number of the linger hole intowhlch the users finger was inserted, and rotates the laminated Worm wheel 9 to cause the governor to regulate the speed of rotation of the parts in returning to normal.. wheel 9 is rotated it gives a rotating thrust to the' worm shaft 13 due to its biased teeth. This rotating thrust causes the-chrome steel ball V22 to be pressed against the steel concave race 24 and become automatically centered, thus providing an eliicient bearing that wears uniformly due to being successively centered on different axes.

Having described my invention, what I consider to be new and desire to have protectedfby Letters Patent will be pointed out in the appended claims.

What I claim is:

1. In an impulse sending device, a main coil spring, a hub having a collar with a slot extending through and below said co1- lar for holding one end vof said spring when placed inside, a lever vhaving a flat ring at one end with projections on the inside of said ring vfor engaging the slot in said hub and fastened on the collar of, said hub :for holding ,said spring. in place.

2. In an impulsesending device, a dial having a perpendicular rod at itscenter, a base plate havimy a perpendicular hub at its center through which said rod extends and in which the same rotates, a coil spring,

operation, but coil spring 4.

.secured to said hub to hold one lWhen the laminated wormV a coil spring hub fastened to said s'prin at the end of said rod, said coil spring ub functioning with said base plate hub to limit the play between said dial and said base plate, and said` hub being tapered to accommodate thel decrease in diameter of said spring upon being tensioned.

' 3. In an impulse sendingl device, a Acoil spring, a coil spring hub, a lever having an insulating bushing fastened on one end, said hub and lever fastened together to hold one end of said spring-,a dial having a perpendicular rod at its center with a notch cut in thev end to receive and hold the end of said spring, a set of shunt springs, said bushing actin to hold open said shunt springs when said ial is in normal position and allowing said shunt springs to close when said dial is off normal. 1

4. In an impulse sending device, a bracket, a power spring, means for securing one end of said' spring to said bracket in fixed relation to the device, circuit controlling springs, an arm for operating said Springs when the evice is moved oli' normal, a' shaft with which said arm rotates, means for permanently' fixing. the free end of said power spring to sald arm, said means cooperating with a slot in said shaftfor removably lfixing said spring and arm in fixed relation to said shaft.

5. In an impulse transmitting device, a power spring, a hubfor said spring, an arm end of said power spring attached thereto, circuit controlling sprinGs and means on. said arm for operating said springs'under control of said power spring.l v

' In an impulse transmitting\device, a spring, a lever having an insulating bushing fixed on one end thereof, a hub in fixed relation to said lever and spring, a 1in er hold dial having a shaft atits center, said shaft vhaving a` free end notched to receive the end of the spring secured to the hub; contact springs, said bushing forv operating said sprin as the dial is operated-from or restore .to normal. l

` 7. In an impulse sending device, a stationary member containing a bearin a movable member containing a shaft whlchfits into said bearing, a power spring assembly com prising a hub to which ahelical spring 1s attached and retained by means of a lever, said -assembly fitting over said shaft and bearing, and means formed in said shaft cooperating with said spring and hub to retainsaidspring in its position over said shaft and to retain said shaft in said bearing.

In witnesswhereof, I hereunto subscribe my name this 5th day of December, A. D., 1923.y f

HERBERT noBEBGFELnf

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