US692967A - Telegraphic transmitter. - Google Patents

Description

No. 692,967. Patented Fab. 1902.

C. E'. YETMAN. y TELEGRAPHIC TRANSMITTER.

(Application led Feb. 8. 1901.) (No Model.) 6 Sheets-Sheet I.

No'. 992,967. Patented Feb. n, |902.

c. E. YETMAN. .TELEGRAPHIC TRANSIMTTER.

(Applicgtion led Fah, 1901.)

6 Sheets-Sheet 2.

(N0 Model.)

No.-692,967. Patented Feb. H, |902. C. E.. YETMAN.

TELEGRAPHIGTRANSMITTER.

(Application led Feb. 8, 1901.)

*ma Model.) s sheets-sheet s.

'ma non ms :trans sa. Haro-pmol. wAsrnNcTon. n. c.

lo. 692,967. Patentedren. |902.; c. E. YETMAN. l

'TELEGRAPHIG TRANSMITTER.

(Application 4ild Feb. B, 1901.) 4

6 Sheets- Sheet 4.'

(No Model.)

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co.. PHOTO-nwo., msm

N0. 692,967. C. E. YETMAN.

' TELEGBAPHIC TRANSMITTER.

(Applicatiop led Feb. B, 1901.)

Patented Fab. n, i902'.l

(No Model.) 6 Sheets-Sheet 5.

IN Il m. 692,967. Patented Feb. n, |902.

c. E, YETMAN;

TELEGBPHIC TRANSMITTER.`

- (Applicatiun med Feb. s, 1901.) I

(No Model.) 6.Sheets-Sheet 6.

El i :ummmml- FME.

CHARLES E. YETMAN, OF OAKPARK, ILLNOIS.

TELEG RAPHIC TRANSlVllTTER.

-SPEGEFIGATION formingpart of Letters Patent No. 692,967, dated February 1 1, 1902.

Application liled February 8, 1901.

T0 all 1071/077?, it Iii/(ty con/cern:

Beit known that l, CHARLES E. YETMAN, of Oakpark, Cook county, Illinois, have invented certain new and useful Improvements in Telegraphic Transmitters, of which the following is hereby declared to be a full, clear, and exact description.

My invention relates to improvements in electric code-transmitters of the type which are operated by finger-keys similar to those of an ordinary type-writer and such as are disclosed in my United States Letters Patent No. 534,025, dated February 12, 1895, and more particularly to such transmitters as are combined with a type-writer the operation of which is governed from the same keys, such as are disclosed in my United States Letters Patent No. 565,128, dated August 4, 1896.

The details of the preferred form of the device are set forth in the following description and illustrated in the accompanying drawings, and the invention is particularly pointed out byclaims at the end of the speciticatiou.

In the drawings, Figure 1 is a longitudinal section through the combined type-writer and transmitter from front to rea-r, one key-lever and the attached parts being shown in full lines. Figs. 1fL and 1b are detail views of a part of the operating mechanism shown in diferent positions. Fig. 2 is a partial v horizontal section on line 2 2 of Fig. 1 looking in the direction of the arrow and illustrating the details of the transmitter. Fig. 3 is a vertical detail sectionalv view through the front part of the machine, showing the connectors between the nger-keys and the switch-shifters of the transmitter. Fig. 4 is asectional view of the transmitter, looking in the direction of the arrow, on line 4 4 of Fig. 2. Fig. 5 is a sectional View, looking in the direction ofthe arrow, on line 5 5 of Fig. 2. Figs. 6 and 7 are detail views of one of the switch-Shifters of the transmitter. Figs. S and 9 are sectional views, looking in the direction of the arrow, on lines 8 8 and 9 9 of Fig.^4, respectively, with the central portion omitted. Figs. 10 and l1 are front and rear elevations, respectively, of the transmitter with certain portions omitted. Fig. 12 is a sectional view, looking in the direction of the arrow, on lines 12 12 of Fig. 2.

The drawings illustrate the invention as Serial No. 46,580. (No model.)

applied to a style of sight type-writer such as is disclosed in my applications for Letters Patent filed by me in the United States Patent Office September 26, 1900, Serial Nos. 31,198 and 31,199; but it will be understood that the improvements are not confined to this particular style and can be applied to various forms of type-Writers without essential departure from the invention.

The base-frame 10 is of the usual rectangular form and is furnished With rubber plugs or feet 11, upon which the machine rests. Upon the base are mounted the plate l2 and the upper portion 13. This upper portion sustainsthe carriage grooved tracks 14 and 15, which, by means of the grooved rails 16 and 17 and balls 18, support the paper-carriage 19. Suitably j ou rnaled on the paper-carriage is the platen y2O. The carriage and paperfeed mechanisms form no part of the present invention and are not shown or described. A semicircular stepped support 21, secured to the frontof the upper portion 13, serves as a mount for the type-bars 22, set in circular range about the same and pivoted tovths separate lugs 23 therefor. The rest-pad 24 forthe type-bars is carried by a support 25, secured to the plate 12. Links 26 are pivoted to and extend below the type-bars 22 and connect the latterto the key-action. The finger-keys 27 are of the usual lever form and are arranged in regular series or banks across the front of the machine and extend back in parallel relation to the fulcrum-ledge 28, which is suitably secured to a strip 29, extending across the frame 10. The key-levers are provided with upwardly-projectin g offsets 30, between Which and the strip 29 extend the springs 31 to hold the levers in their normal uplifted position in readiness to be struck by the operator. universal bar are also fulcrumed on the ledge 28, land the universal bar is arranged to operate a suitable escapement (not shown) for the paper-carriage. A buffer 34 is arranged across the machine above the key-levers, against which the latter strike when released.

Interposed between the key-levers and the The usual space-bar 32 and IOO serve to actuate both the bars of'the typewriter and the switch-Shifters of the transmitter. Although 'these devices are frequently used in unison, by which means a verifying copy of the message transmitted will be written, yet occasions frequently arise when it is desirable to operate either the transmitter or the type-writer separately or to throw either or both devices ont of operation-as, for example, when the operator temporarily leaves his Work-so that the machine will not respond to accidental or mischievous operation of the linger-keys. For these reasons a series of supplemental levers are interposed between the key-levers 27 and the links 26. The levers are pivoted on the fnlernm- bars 37 and 38, are pivotally connected at their upper ends to the links 26 of the typebars 27, and are provided with laterally-projecting pins 39, which are engaged in slots or seats in the upper part of offsets 30. Itis obvious that if the supplemental bars be raised so that the pins 39 will clear these slots or seats, then the depression of the key-levers will produce no movement of the supplemental levers or of the type-bars. I prefer to einploy the mechanism next to be described for eec'ting this result.

Through the frame 10 extends a shaft 40, provided on its outer end with an operatinghandle and inside the frame with cranks 42,-

which are connected by links 43 with toggles 44. One end of toggles 44 is pivoted to thel fnlcrnm-bar 37 and the other to the depend-v ing brackets secured to bar 2S. The pivotbars 37 and 38 are connected together by suitable bolts 45, that pass through guidesleeves 46, mounted in thecentral pivot-bar 28. In Figs. l and 1b the parts are shown in normal position, with the pivot-pins 39 in engagement With the seats on offsets 30. If, however, the parts are shifted by shaft into' the position shown in Fig. 1", the pivot- bars 37 and 38 and supplemental levers 35 will be` bodily moved to the pins 39 from engagement with the offsets 30 and the type-.bars will not respond to the play of the key-levers 27. By reference to Fig. lb it will be seen that the toggles 44 are shifted slightly beyond the line of centers, so that they serve to temporarily hold the pivot-bars and supplementary levers in raised position.

Toward the front of the machine each keylever 27 carries pivoted thereto, as at 47, a connector 48, having a side pin 49, designed to encounter the toe of the switch appliance or shifter F, extending into the path Ithereof. are provided with slots 5l, all of which are engaged by a throw-off 52, which consists of a transverse metal rod and sliding combbar 52, sustained at its ends by cranks 53,

mounted on trunnion-shaft 54, whereby the vthrow-off may be shifted to bring the studs 49 into or ont of range with the toes ofthe parallel series of Shifters F on the transmitter. On one end of the shaft 54, which extends The parallel set of connectors 48' through the side of the machine, is secured v the actuating-handle 55. Acam-spring 56 is secured to the side of frame 10 and is provided With an angular cam-surface 57, which engages a similar cam-surface 58 on an arm 59, secured to shaft 54. The operator will operate the handle to move the parts until the point of the angular cam-surface 58 is passed beneath that of cam-surface 57 which cam-surfaces Will then operate to force and lock the parts either into or out of the'operative position.

Secured inside lof the frame l0 by means of-screws 60 passing through bosses 61 are the side frame-pieces A A of the transmitter, which is thus free to be attached to or detached from the type-writer proper, as desired.` The side pieces A A are preferably of insulating material-e. g., vulcanized fiberand in suitable recesses therein are located the hub-boxes a of the tinted shaft B. Shaft B extends across the machine and affords a mount for the set of switch appliances such as are requisite to transmit a complete system of conventional code-signals. At one end (see Figs. 2 and 8) the shaft B carries a pinionb, usually of vulcanized ber, and which engages with the gear-train (not shown) of a suitable motor designed to drive the shaft at uniform speed. I

A series of shifters F in the form of levers and designed to control the diversion of the electric current through any of the several switches or symbol-disks appropriate to the individual signals in the code system is mounted in parallel array near the lower part of the transmitter-frame. The several shifters are pivoted to the comb-bar 62, secured at the rear to the side frame-pieces A Af, and extend through the downwardly-projecting teeth 63 ofthe bar 64, secured to the front of the trans= mitter-frame. By the teeth 63 the free ends of the switch levers or Shifters are held in position and have a limited play between the buffer-strips and 66 of the transverse bars 64 and 67, respectively. Springs 68 extend between the Shifters F and the transverse bar 69 and hold the former in normal relation snugly against the bner-strip 65 and in position for stud-pin 49 on connector 4S to strike the toe 50 of the adjacent shifter F and depress the shifter against the stress of spring 68 if the suitable key-lever be brought into play.

0n the rotating driver B is mounted the ,Series of symbol disks or'rings E, the inner rims of which are tinted to engage at will with the iiuted driver. On the outer rim of the several metal rings E are insulatory blocks e at proper intervals. The insulation varies in keeping with the conventional signal for the letter, character, or word to be transmitted by the particular ring. The drawing Fig. 4 shows a ring designed to send one dash and two dots, which by the Morse code signilies the letter D. Itis also apparent that the ring referred to has the signal dash and dots IOO IIO

repeated three times about its periphery. Space-pins e project from the ring-rim between each signal set. These are preferably set in insulating-plugs of rawhide and serve as trips to check the motion of the ring at the insulation-block on completion of the signal, as presently set forth.

Ordinarily thecircuit-rings E stand disengaged from the driver B, but rest instead upon the Shifters, which are provided between their ends with a curved portion, to either side of which are secured strips 69 of insulating material-e. g., vulcanized fiber-which are of rounded contour to conform to the ringrim. In such shape the shif ters act as a brake to quickly arrest Vthe revolution of the ring on release from the driver. The strips 69 furnish a broad seat for the ring and proper clearance for the space-pins e on the ring, which are convenientlyset on the median line of the rim. In order to separate the rings, thin insulating-strip 70 is secured in one side of each of the shifters, and its upper edge is straight, so that the entire series of Shifters, with the insulating-strips, forms a series of recesses in which the symbol-disksl rest and by which they are held apart. Under stress of the springs 68 the shifters F generally stand in uplifted position and carry with them the series of circuit-rings, which are thus free from the driver B and do not revolve.

The transverse bar 64 is provided on its inner face with notches, in which are pivoted the upper members m of the togglelatches by means of a common pivot-rod P2. The lower members m of the toggle-latches are pivoted to the members m and by a pin-andslot connection to the forward ends of the Shifters F. Coiled springs P are fastened to a common rod P', extend through openings in the bar 64, and are attached to the members m of the toggle-latches. These toggle-latches are held in their normal flexed position (shown in Fig. l) by the upward pressure of the shifters under stress of the springs 68. When any particular shifter is depressed, the toggles are straightened and drawn into a position somewhat beyond the line of centers by the springs P, (see Fig. 4,) so that the shifter is locked in its depressed position. At the same time the trip-pawl g", which is pivoted at the upper end of lever lm, drops accordingly against the face of the circuitringE and rests in the path of the space-pins e. The descent of the shifter necessarily lowers the circuit-ring E, which it controls, and brings such ring into engagement with the rotating driver B. At once the circuitring begins to revolve and so persists for a distance sufficient to transmit the desired signal.

When the transmitter is in use, the electric circuit can be traced from the battery (not shown) by wire 7l and binding-post 72, Figs. 2 and l0, wire 73, to binding-post 73a., to the transverse metallic comb-bar 74, which is secured at the rear of the transmitter to the insulating side walls A A. The bar 74 carries aseries of contact-pieces u u', brought to bear lightly upon the several circuit-rings E. When the metal part of the vring makes contact with the contact-pieces "Lt u riding thereon, the circuit is closed thereby and may be traced further from the ring E, driver B, spring 75, pressed in contact at one end thereof, binding-post 76, line-wire 77, binding-post 78, and line-wire 79 to the distant station. To further insure the completion of the cir-V cuit,.a wire 8O connects the binding-post 76 with the metallic hub-box a of the driver B. The successive dots and dashes to complete the signal are produced by the variations in lengths of the metallic parts of the ring hav.- ing the insulation-blocks between them. As the signal is finished the next space-pin e' on the ring E encounters the trip-pawl g and forces it backward, thereby rocking the upper member m of the toggle-latch until its lower end has passed the line of centers. The shifter is then` free to rise again to its normal position under stress of the spring 68, and in rising it lifts the circuit-ring E out of engagement with the shaft B, arrests its motion, and forces the toggle-latch back into its normal position, while a lug or projection m2 on lever m engages the pawl g and raises it clear of the ring. The parts are thus all re'- turned to the normal state in readiness to allow for transmission of the next character or, as may be requisite, to repeat the same character.

In order to insure that the trip-pawl g will' always drop into contact with the ring E and to prevent it from being thrown back out of its normal position, the lever m is provided with a lug or projection m3 similar to lug m2 above the trip-pawl g. Y

If multiple repetitions of the same character are desired, as in calling a distant station, this can be accomplished by holding the trippawl g'l out of action clear of the path of the space-pins on thel circuit-ring E. A transverse pivot-bar W, arranged at one side and above the rings, carries the ol'set rod @which will swing in the path of the series of pawls g. The button 'y' is threaded onto the end of bar W and, extending through one side of the machine-frame, Fig. 2, serves to turn said bar, and thus bring the offset rod fr; in position to prevent the pawls g from dropping into contact with the rings E. Hence when the selected shifter is depressed and held down by its latch the individual pawl g pertaining to the toggle-latch must stay uplifted, by which expedient the circuit-ring E continues to re- Volve on the driver B until the rod w is withdrawn at the will of the operator to allow the pawl g to descend and effect the release of the latch, shifter F, and ring E. A lockingcam 8l is located in a depression in the inner slde of the frame-piece A and is secured to the bar W. The movement of the rods WV and a; is limited by the stop-pin S2, secured to framepiece A and engaging a depression 83 in cam 8l. Cam Slis also provided with two annufinger-keys of the keyboard would be uneven.

assigned position.

lar notches 83, adapted to be engaged by an angular projection 84 on spring 85, secured to frame-piece A, by which the bar W together with its cross-rod a; are held in their The contactpieces u a are arranged in pairs, both pieces of each pair engaging a single contact-ring. Between each pair is a shoulder-pin u2, to which the contact-pieces are loosely connected, light'spring's 86, extended between these pins and pins 87, connecting the insulating-pieces on the shifters F. One of each pair of contact-pieces has secured at its end a piece as, of insulating material, which projects downwardly to a slight extent between adjacent rings E and serves to space their upper edges apart. By providing two contacting-pieces for each ring, which are to a slight degree independently movable, I insure that the contact between the pieces and the metal parts of the rings will not be broken by the presence of particles of dust, &c. i

It will be seen that ring E, if the springs 86 were fastened to a ixed part, would necessarily be raised against the pressure of these springs; but by securing them to the shifters F and arranging the parts so that little pressure will be exerted by springs 68 in the normal position tension will be placed upon these springs 86, when the particular shifter is depressed at just the time when such a ten sion is required; but as soon as the shifter'F'commences to ascend this tension is relieved and the ring E is easily lifted by the stress of spring 68 on shifter F. For this reason the springs 68 may have comparatively little tension, and therefore since the keys act in opposition to these springs the instrument will quickly respond to the operators touch.

V As clearly shown in Fig. l, the length of the iinger-keys varies from the shortest in the highest bank of keys to the longest in the lowest bank, while the connectorsare all pivoted to the linger-keys ata uniform distance from the fulcrum. If, therefore, the contact-pins 49 are all located at the same distance from the pivots 47, it is evident that the depression of the To remedy this difficulty, the distances from the pivots 47 to the contact-point between the connectors 48 and the Shifters F is varied in proportion to the length of the levers by varying the distance of the pins 49 from the pivots 47. By reference to Fig. 3 it will be seen that these pins are located at four different points 49, 49h, 49", and 49d, the connectors of the shortest key-levers having pins located at 492L and those of the longest having pins located at 49d, Wh'ile the connectors of the levers'of intermediate lengths have contactpins located at 49b and 49C. This arrangement will insure the proper actuation of the Shifters of the transmitter while allowing the same extents of downward movement to the forward ends of the key-levers regardless of their length-7). e., it insures a uniformity of touch for the keys. The same result could be accomplished by placing the pins 49 at a uniform distance from the pivots 47 and placing lugs of varying heights on the toes 50 of the shifters F.

Provision is made for the arrest of the rotating driver B and to establish a short circuit around the machine. The end ring D of the series of rings, Figs. 5 and 8, is entirelyof metal and is provided with a brake-surface 88, which is adapted to bear on the reduced portion 89 of the driver B. The locking-ring D -is provided at its top with a projecting lug 90,

to which are pivoted on either side the connecting-pieces 91, which arelikewise pivoted to the transverse circuit-bar 74, The shifter F to control the locking or short-circuit ring is mounted as usual and is provided with a heavy spring 86, which forces the brake-surface 88 of the ring D against the reduced portion 89 of the, shaft B when the shifter F is erator to throw the connectors 48 out of operative position.

lt may be desirable to complete the linecircuit through the machine without stopping the rotation of the driver B or without throwing the connector 48 out of operative position--as, for example, when the operator is interrupted for a few seconds. For this purpose the studs 94 and 95 are mounted in insulating-sockets 96 and 9 7 in the side of the v machine and connected by wires 98 and 99 with the binding-posts 78 and 72. Stud 94 is provided with the switch-lever 100, whichis adapted to engage the spring-contact surface.

lOl of stud 95.

- Obviously the details of my invention can ing thereto, of the connectors extending from said finger-keys and engaging with said shifters, the position of the points of engagement IIO between said connectors and Shifters varying in accordance with the varying lengths of the corresponding finger-keys.

3. The combination with theindividual 1inger-keys of varying lengths and with the series of transmitter switch-Shifters corresponding thereto, of the set of connectors extending between said keys and Shifters andhaving offsets for engaging said Shifters, the location of said offsets nponthe connectors varying in accordance with the varying lengths of the corresponding nger-keys.

4. The'combination with the individual finger-keys of varying lengths and with the series of pivoted transmitter switch-Shifters corresponding thereto, of the set of connectors pivotedl to said finger-keys and provided with offsets adapted to engage the free ends of said Shifters, the distances between the pivots and offsets of said connectors varying in accordance with the varying lengths of the corresponding finger-keys.

5. The combination with the series of transmitter switch-Shifters, of a series of individual finger-keys corresponding thereto and having operating connections therefor, and a set of toggle-latches for holding said Shifters out of normal position when actuated by the finger-keys.

G. The combination with the individual fny ger-keys, and with the series of transmitter switch-Shifters corresponding thereto, of the set of connectors extending between said keys and Shifters, whereby said shifters are depressed, and the set of latches for holding said shifters depressed, each of said latches consisting of toggle-levers one of which is pivoted to a fixed part and the other to the appropriate shifter.,

7. The combination with the individual finger-keys and with the series of transmitter switch-Shifters corresponding thereto, of the set of connectors extending between said finger-keys and said Shifters, whereby the latter are depressed, and the set of toggles extending between a fixed part and said Shifters for holding the Shifters in the depressed position.

S. The combination with the individual linger-keys and with the series of transmitter switch-Shifters corresponding thereto, of the set of connectors extending between said nger-keys and said Shifters for actuating said Shifters, the set of togggles extending between a xed part and said Shifters, for holding the latter out of normal position when actuated by the finger-keys, and trip-pawls for throwing said toggles to restore the selected shifters to their normal position.

9. The combination in an electric transmitter, with a series of switch-Shifters and with a rotating shaft having circuit make and break devices thereon, of a set of toggles engaging with said Shifters to hold them depressed, trip-pawls carried thereby and projected by the descent of said Shifters into the path of said make and break devices, and engaging at intervals therewith to throw the separate toggles and restore the Shifters to their normal position.

10. The combination, in an electric trans- 4mitter, with a series of switch-Shifters, of a set of latches engaging with said Shifters toA hold them depressed, trip pawls pivoted thereon and actuated bya moving partof the device to throw said latches and restore the Shifters to their normal position, and lugs on said latches engaging said pivoted trip-pawls.

l1. The combination, in an electric transmitter, with a series of switch-Shifters and of a set of latches engaging with saidshifters to hold them depressed,trip-pawls pi voted thereon and actuatedpby a moving part of the device to throw said latches and restore the Shifters to their normal position, said latches being provided with lugs engaging said pivoted trip-pawls on either side.

12. The combination, in an electric transmitter, with the series of spring pressed, switch-Shifters, of a set of spring-pressed toggles extending between a fixed part and said switch-Shifters to hold the latter depressed, and means for throwing said toggles to restore the Shifters to their normal position.

13. The combination with a rotating shaft, and with a Series of circuit make and break rings thereon, of a set of Shifters for controlling Said rings, a set of contact-pieces engaging said rings, and springs extending between said Shifters and Said contact-pieces.

14.. The combination with a series of movable contact-surfaces, of a set of Shifters controlling the movement of said surfaces, a set of brushes engaging said surfaces and springs between said brushes and said Shifters.

15. The combination with a rotating shaft, and with a series of circuit make and break ringsthereon, of a set of Shifters for controlling said rings, a pair of contact-pieces, loosely connected together engaging each of Said rings, and springs between each pair of contact pieces and the shifter corresponding thereto.

16. The combination with a rotating shaft and with a series of circuit make and break rings thereon, of a set of shifter-s having curved seats or depressions for supporting said rings, and insulating-strips Secured to Said Shifters on one side of said seats or depressions and extending between the rings.

17. The combination with a rotating shaft and with a series of circuit make and break rings thereon, of a set of contact-pieces engaging Said rings, and insulating-strips secured to said contact-pieces and extending between said rings.

1S. The combination with a rotating shaft, and with a series of circuit make and break IOO IIO

IZO

rings thereon, of a set of Shifters for controlling said rings, a set of contact-pieces engaging Said rings, and insulating-pieces securedV`v of nger-keys, switch-Shifters and type-bars corresponding thereto, pivoted supplemental levers operatively connected to said typebars, offsets on said finger-keys engaging said supplementary levers, a throw-utf common to the fulcra of the supplementary levers to disengage them from said offsets, and connectors pivoted to said linger-keys and engaging said switch-Shifters.

20. The combination in a combined typewriter andtransmitter, of the individual pivoted finger-keys, the series of type-bars and switch- Shifters, corresponding thereto, the set of pivoted supplemental levers connected by links with said type-bars, offsets on said finger-keys provided with notches engaging pins secured to said supplemental levers, connectors pivoted to said finger-keys and having offsets engaging said switch-Shifters, a throw-o common to the fnlcra of said supplemental levers for bodily moving the same to disengage said pins from said notches, and a second throw-olf common to said connectors to cast the same at Will and free the Shifters from the keys.

21. The combination in a combined type- Writer and transmitter, of the individual iinger-keys, the series of type-bars and switchshifters corresponding thereto, the set of pivoted supplemental levers operatively con- 3o

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