US1785072A

US1785072A - Telegraphic transmitting instrument

Info

Publication number: US1785072A
Application number: US240433A
Authority: US
Inventors: William D Cooper
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-12-16
Filing date: 1927-12-16
Publication date: 1930-12-16
Anticipated expiration: 1947-12-16

Description

Dec. 16, 1930. w. D. COOPER TELEGRAPHIC TRANSMITTING INSTRUMENT 4 Sheets-Sheet 1 Filed Dec.

Dec. 16, 1939, I w, D COOPER 1,785,072

TELEGRAPHIC TRANSMITTING INSTRUMENT Filed Dec. 16, 1927 4 Sheets-Sheet 2 Dec. 16, 1936. w. DQCQOPER 1,785,072

TELEGRAPHIC TRANSMITTING INSTRUMENT Filed Dec. 16, 1927 4 Sheets-Sheet 3 Dec; 16, 1930.

W. D. COOPER" TELEGRAPHIC TRANSMITTING INSTRUMENT Filed Deon 16, 1927 4 gpeet-ihleet 4 9 5,2 9,3? 28 8/ .1 I I m 8 7 I' 7 v. 129 2 y n u Q Patented Dec. 16, 1930' UNITED STATES WILLIAM D. COOPER, OF ST. PAUL, MINNESOTA TE EeRarIIIc TRANSMITTING INSTRUMENT Application filed December 16, 1927. Serial No. 240,433.

My presentinvention relates to telegraphic transmitting instruments and'is in the nature of an lmprovement on or modlficatlon of the instrument d sclosed and cla med in my prior Patent #1,632,273, of date June 14,

1927. The machine of .myprior patent was designed for sending dots or short impulses or, at any rate, only one class of impulses, whereas the present invention is designed 19 for sending both dots and dashes, and to that end is provided with two series of keys, the one for sending dots and the other for sending dashes or relatively long, impulses.

The two series of dot and dash-sending keys 5 are arranged in a group or bank, and while each series may vary in number, itis only necessary for the commonly used codes to provide five keys in each series or sometimes even a less number of keys. The keys of the bank are arranged for sending dots and clashes in evenly spaced series, varying in number according to the key struck. For example, if the dot key No. 4 be struck or depressed, there will be produced a series of four dots or even spaced relatively short telegraph impulses. For sending single dots or single dashes, I preferably employ an ordinary telegraphic key that is available when desired for sending messages by the .30 customary manipulation thereof.

In carrying out the features above out lined, various novel devices. and combinations of devices are employed, all of which will be hereinafter described and defined in the claims. I

In the accompanying drawings, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a plan view of the device, with some parts broken away;

Fig. 2 is a fragmentaryv side elevation of the device, looking from the right toward the left in respect to Fig. 1;

Fig. 3 is a section taken on the line 33 of Fig. 1; a

Fig. 4 is a section taken on the line 44 of Fig 1, some parts being broken away;

Fig. .5 is a section taken on the line .5-5 0f 5 Fig. 6 is aside view of the device looking from left toward the right in respect to Fig. 1, some parts being shown in section and some parts being omitted;

Fig. 7 is a side elevation of the so-called booster spring and drum; r

Fig. 8 is a section taken approximately on the irregular line 88 of Fig. 1, some parts not shown and some'parts being broken away; V

Fig. 9 is a view Fig. 1, some parts being broken away and also showing a complete wiring diagram;

Fig. 10 is a section taken on the line 10-10 of'Fig. 9, some parts being shown in full I and some parts being broken away;

Fig. 11 is a detail view of one of the contact arms, some parts being, shown in elevation and some parts being broken away; and

Fig. 12 is a fragmentary perspective view of the key lock. I

The various parts of the complete appa ratus are mounted on a common base 14, so that they constitute a portable self-contained device. the device, however, are supported by a frame 15, which frame is secured tothe base 14 by means of screws or bolts 16. The bank of keys is divided into two series a and b.

Each key in the series a 'is adapted to be manipulated to send a different predetermined number of short impulses or dots, and each key in the series of keys I) is adapted to be manipulated to send a different predetermined number of long impulses or dashes.

The

keys

2, 3, 4, 5 and 6 of series a control mechanism for sending dots numbering from 2 to 6, respectively, and the

keys

2, 3, 4, 5 and 6 of series I) control mechanism for sending dashes numbering from 2 to 6, respectively. The several keys mentioned are all pivotally secured to the downwardly projecting arms of hell cranks 18, but are free for only a slight upward pivotal movement thereon. The keys in series a and b that control mechanism for sending corresponding numbers of dots and dashes are pivoted to the same bell crank 18. The several bell cranks 18 are pivotally supported upon a transverse rod 20 that is secured at its ends Most of the principal elements of taken on the'line 99 of to opposite sides of the frame 15, and collars 21 are interposed between said levers to keep said levers in the proper spaced relation upon said rod.

The horizontally disposed upper arms 18 of the bell cranks 1.8 are normally supported at their free ends by shoulders 22 formed on small levers 23, (see Fig. 5). The several small levers 23 are tiltably mounted upon a transverse rod 24 that is supported at its ends in the frame 15. Formed on said small levers 23, above their shoulders 22, are lugs The said lugs 25 normally engage the blunt free ends of the horizontally disposed upper arms 18"-, but when any one of said levers is raised by manipulation of a key cooperating therewith, the blunt free end of that arm 18 will disengage from the lug 25 and said lever 23 will tilt pivotally on said rod 24 until its lower end comes into con tact with the transverse stop rod that is supported at its ends in the frame 15, at which time the rounded head of the cooperating lug will engage the under surface of said arm 18 near its free end and support the same in an operative position, (see Fig. hen the machine has completed the sending of a predetermined number of dots or dashes caused by the single manipulation of a single key, the cooperating small lever 23 will be returned from its tilted operative position to its inoperative raised position, thereby allowing the cooperating arm 18 of the bell crank 18, to which said last manipulated key is secured, to return to its inoperative position. The small levers 23 are held in proper spaced relation on the shaft 24 by spacing collars 23.

A. long pinion 26 extends between the opposite sides of the frame 15 and is carried by a shaft 27 that is journaled at its ends in said frame. Fast on the shaft 27, adjacent to one side of the frame 15, is a ratchet 28 that is adapted to be engaged by a pawl 29, (see Fig. 4). The pawl 29 is supported by a pair of arms 30 that are pivotally mounted at one end to the transverse rod 20 and formed with a cross bar 31 near their opposite ends. The cross bar 31 normally rests upon the upper edges of the several arms 18 of the bell cranks 18. Pivotally jointed t0 the lower ends of the downwardly projecting arms of the bell cranks 18 are rack arms 32 that carry segmental racks 33 on their ends adjacent to the long pinion 26. The racks 33 and rack arms 32 are supported by a raised portion 14 of the base 14.

Each rack 33 is formed at its top with an upwardly extending lift lug 33 that is adapted to engage the under side of one of the short levers 23 and return the same from an operative to an inoperative or normal position. Said lift lugs 33 are of different lengths, the longest of said lugs being on the rack 33 that cooperates with the keys 2 of the series a and Z), and the shortest of said lugs being on the rack 33 that cooperates with the keys 6 of the series a and 6. When one of the keys 6, for example, is depressed, the rack 33 that cooperates with said keys will engage the long pinion 26, the upper arm 18 of the bell crank 18 to which said keys are secured will be raised to its operative position, the small lever 23 will fall pivotally so that its free end rests on said stop rod 15 and the rounded head of the lug 25 on said small lever 23 will engage the under surface of said arm 18 near its free end and hold all of said parts in their operative position during the complete operation, which, in this example, may be considered six dots or six dashes. The rack 33 will be raised by the rotating of the long pinion 26 and its lift lug 33 will come into contact with the small lever 23 near its free end and raise the same to an inoperative position, at which time the lug on said small lever 23 will disengage the under side of the free end of said arm 18. The end of said arm l8 will drop upon the shoulder 22 of said small lever 23, the edge of the lug 25 of said small lever will engage the blunt end of said arm 18, the keys will be returned to their normal position, and said rack 33 will be disengaged from the long pinion 26.

Fast on the shaft 27, near one end thereof, is a cam wheel 34 adapted to actuate the switch bar 35 that is pivoted on a pin 36 to a bracket 37, which bracket is secured to one side of the frame 15 by bolts or the like 38. Adjacent to the cam wheel 34 and secured to the shaft 29 for common movements there.- with is a gear 39 that meshes with a gear 40. Said gear 40 is mounted near one end of a short shaft 41 that is journaled in

bearings

42 and 43, which bearings are formed with standards 43 that are mounted on brackets 14. On the other end of said shaft 41 is a relatively large gear 44 that meshes with a small gear 45 on a short shaft 46 that aligns with the main shaft 27. The short shaft 46 is j ournaled in a bearing 47 that is formed with a standard 48 that is mounted on the base 14. Mounted on the inner end of the short shaft 46 is a cam wheel 49 that is adapted to actuate a switch bar 50 that is pivoted on the pin 36 to the bracket 37 adjacent to the switch bar 35. The cam wheel 34, gears 39, 40, 4.4 and 45 and cam wheel 49 are all secured to their respective shafts for common move ments therewith. It should here be noted that the cam wheel 34 mounted on the main shaft 27 will turn at'a speed even therewith, but the cam wheel 49 mounted on the short shaft 46 is driven from said main shaft 27 through gears 39, 40, 44 and 45 at a ratio of one to two and, hence, will turn at twice the speed of said main shaft 27. The cam wheel 34 cooperates with the switch bar 35 for making dots and the cam wheel 49 cooperates with contacts 35 and 50 The cam wheel 49 has only one-half the cams as the camwheel 34.

To rotate the shaft 27 when one of thekeys in series a or b is depressed, there is pro- .vided. anelectric motor .57 of the disc type, which motor comprises a magnetic core 58 having

poles

59 and 60, a magnetic winding .61, a frame 62 mounted on the base 14, a motor shaft 63, and a disc-like wheel 64. The disc 64 is secured to {the motor shaft 63 and said motor shaft 63 is journaled in suitable 1bearings'62 in the arms 62 of the motor framel62. The oore;59 is reduced at 59 and said reduced portion 59? is inserted ,througha hole in the frame 62. A crank 65 is applied to saidreduced portion 59 and is secured thereto by welding or the like. The pole 59 0f the core 58 is thusmagnetically connected to the frame 62, which frame is of iron or steel, and said frame 62 is provided at its opposite side with a boss 66 that acts as the pole 5.9 of-said core 58 and is directly oppositethe pole '60 but spaced therefrom to allow the disc 64 to pass .therebetween without making cont-acttherewfith; half-round flange 67 is applied to the end of .the pole 60 so that when .the complete magnet is revolvedby means of theorank 65, more or :less of the flange 67 of saidpole 60 will overlie the outside portion of the disc 64 and, hence, vary the speed of said disc.

The motor shaft .68ycarries a small pinion 67 and a small idler gear 68. Said gear 67 is pinned or keyed to the shaft .63 and said idler 68 is loose on-said shaft but held against lateral sliding movements thereon by collars 6.9. The pinion :67 will, at all times, turn at a speed even with the motor shaft 64, but the idler gear :67 on the motor shaft 63 is driven from said pinion 67 through a train of gears at a. ratio of four .to one, and, hence, will turn ,only one-fourth the speed ofsaid motor shaft or pinion 67. The train of gears includes a large reduction gear 171 secured to one end of a shaft 72 journaled in a bearing pedestal '73. At its opposite end, the shaft 72 carries a pinion 74 that meshes with an intermediatepinion 75 also journaled to the pedestal 73. The pinion 7 5 meshes with the loose pinion 68 onthe shaft'63.

On the main shaft 27 near one end thereof is a sleeve 27 -thatcarries lf/WQ relatively large axially spaced gears and 81, adoudrum 83, whichdrum issecured to said sleeve by a set screw 84. The large gear 80 meshes with andis'driven by the small pinion 67 on the motor shaft 63 and is adapted to be con nected with said main shaft 27 by a suitable mechanism under control of the several keys of series a. to drivesaid shaft at 'a comparatively high speed while sending dots, and the large gear 81 is, driven from the small idler 68 on the motor shaft 63 at a comparatively low speed or one-fourth the speed of the large gear 80, and is adapted to be connected with said mainshaft 27 by suitable mechanism under control of the several keys of series b for sending dashes.

The main shaft 27 is connected with the sleeve 27 by a booster spring 84 within the drum 83. One end of said spring 84 is secured to the drum 83 at 85 and the other end of the spring is secured to the shaft 27 at 86. Formed on the hub of the drum 83 is a small ratchet 87. The ratchet 87 is engaged by a spring-pressed pawl88 to hold said ratchet 87, drum 83 and

sleeve

2,7 against reverse rotary movements. The spring pressed pawl 88 is pivotally secured at 89 to a standard 90 that extends upward from the .base 14.

'l/Vhen the-machine is operated, the shaft 27 will be driven from the sleeve 27 through the booster spring, 84-and, hence, said booster spring will be partially wound up, and when said shaft 27 is positively stopped by the action of the large pawl 29 on the large ratchet 28, the small pawl 88 that engages the ratchet 87 will keep said spring partially .wound by holding said drum 83 and sleeve 27 against rotary movements in a reverse direction. It should now be understood that when the machine is in a normal neutral position, the shaft will be under constant tension .of the booster spring 84.

When a key has been struck, the large pawl 29 will disengage thelarge ratchet 28 and said booster spring 84 will exert its stored-up energy, therebygiving said shaft 27 a quick 1 As a means for selectively connecting the

gears

80 and 81 to the main shaft 27, one at a time, to drive the same, I employ the doubleacting clutch member 82, which clutch member is laterally slidable on the sleeve 27 between the

large gears

80 and 81, but is keyed thereto at 91 for common rotary movements therewlth. The double-actmg clutch member 82 is provided at its opposite sides or ends with outwardly projecting spring clutch fingers 92 and 93 that are adapted to frictionally engage flat clutch surfaces 92 and 93, respectively, on the inner surfaces of said gears 80 and 81.

Pivoted near its upper end at 94'. to an arm 9 1 that projects outward from the bearing pedestal 73 is a shipper lever 95 that is bifurcated near its central portion 96. Projecting inward from opposite sides of the bifurcated portion 96 are trunnions 97 that work in an annular groove 98 in the double-acting clutch member 82, so that when said shipper lever is moved to one side or the other, said doubleacting clutch member 82 will slide laterally 1 on said sleeve 27 a and its clutch fingers 92 or 93 will come into contact with their cooperating clutch surfaces 92 or 93*, depending upon the direction in which said shipper lever and double-acting clutch member are moved. At

its lower end, the shipper lever 95 has a read 99 that is adapted to be acted upon by magnets 100 and 101 to move said shipper lever 95 and double-acting clutch member 82 in the direction of either of said magnets independently energized to cause the clutch when any one of said last noted keys is manipulated, the large gear 81 will become frictionally connected with the shaft 27 to drive the same at a relatively slow speed for making depressions.

The electric motor 57 and magnets 100 and 1.01 may receive electric current from any suitable source, but, as shown, are adapted to be connected to line wires 110 of what may be considered an ordinary commercial electric light line. The motor 57 is adapted to be connected to the line 110 through lead wires 111 and 112 and a normally open jack switch 113, which switch will be closed, when any one of the several keys in series a or F) is depressed, by an adjustable lift 11 1 on the outturned end of the arm that carries the large pawl 29. The magnet 100 is adapted to be connected to the line 110 through

lead wires

115 and 116 and a normally open jack switch 117,

which switch will be closed by a rod 118 when any one of said keys in series a is depressed. The rod 118 engages the under side of said last noted keys and rests at one end on the top of a switch 117. The magnet 101 is adapted to be connected to the line 110 through leads 119, 120 and a normally open jack switch 121, which switch will be closed, when any one of the keys in series 7) is depressed, by a rod 122 that engages the under surface of said keys in series I) and rests at one end on the top of said switch 121. The rods 118 and 1.22 are formed with arms 123 that are tiltably secured to opposite sides of the frame 15. The

switches

113, 117 and 121 are all secured to but insulated from the frame 15.

It should now be understood that when a key in series a or b is depressed the motor switch 113 will be closed and will remain closed during the complete operation, but when the magnet switches 117 and 121 are closed by manipulation of one of their cooperative keys, they will remain closed only for an instant. The spring tension in said jack switches 117 or 121 will cause either of switches to open, will raise the cooperating

rod

118 or 122, and will return the operated key to its normal position.

To keep the operated magnet energized during a complete operation, I provide

jack switches

123 and 124; located on opposite sides of the shipper lever above its head 99, which switches, when closed, will connect said operated magnet with the line 110 through the motor switch 113. The

switches

123 and 124 are supported from the base 14 by a block of insulating material or the like. The switch 123 is adapted to be closed by the shipper lever 95 when said lever is moved in that direction by the action of the magnet 100, and the switch 124 is adapted to be closed by the shipper lever 95 when said lever is moved in its direction by the action of the magnet 101. The side of the magnet that runs to the line through the leads and switch 117 also runs to said line through a lead 125, switch 123 a lead 126, motor lead wire 112 and the motor switch 113. The side of the magnet 101 that runs to the line 110 through the lead and switch 121 also runs to said line through a lead 127, switch 124, leads 129 and 126, motor lead wire 112 and motor switch 113. When the switch 117, for example, is momentarily closed, the magnet 100 will become energized, the head of the shipper lever 95 will be drawn thereto, the switch 123 will be closed by said lever, and said magnet 100 will be operatively connected to said line 110 through said motor switch 113 and said magnet will remain energized until said motor switch is allowed to open at the end of the operation.

The telegraphic line 130 is normally closed when the transmitter is not in use, but is adapted' to be opened by a manually operated switch 131 on thebase 14' of the instrument. For sending one dot or one dash, the common telegraphic key 132' may be actuated in. the customary manner.

The switch arms 35'and are both actuated at the same time byv their cooperating cam wheels 34 and 49, respectively, and, hence, it is necessary that only one-of said switch bars is operatively connected at a time to said telegraphic circuit. When the machine is inoperative, neither of said switch bars 35 or 50 is connected to'said telegraphic circuit. To operatively connect the proper switch bar 35 or 50 to the telegraphic circuit, I provide jack switches 133 and134. The fixedcontacts50 and 53-that cooperate with the spring-pressed contacts 35 and 50 respectively, on the arms 35 and 50 are connected directly to the telegraphic line 130 through leads-135 a-nd136. The spring pressed c011- tact 35? on the switch bar '35 is adapted to be connectedto'the telegraphic line 130 through the lead 136 switch 133, leads 136 and 137, and and the spring-pressed contact 5O on the switch bar 5.0is adapted to be connectedto the line 130'through a lead 138, switch 134, leads 139 and 137.

Securedto two of the spacing collars 23 that are loose on the rod 24, between the small levers 23, are arms 14.1mm are formed with a transversecrossrod 142. The transverse cross rod- 142 extends across-andis seated in notches 143 in each of the several small levers 23. Extending upward from the arm 141 near the cross'rod 142 are-upright members 144 that carry a cross rod 145, one end 0f which normally engages the under surface of the upper spring member of. the motor jack switch 113. The vparts-141, 142,144 and 145 constitute an anti-locking device that. is

adapted tofunction only under unusual circumstances. If a key is held depressed at the F time the machine has-completed an operation caused thereby, the rack 33. that cooperates with said key will not be allowed to disengage from the pinion 26, and-its lug- 33 will raise the'cooperating-lever'23 beyond its normal position, which will raise the

cross rods

142 and 145, and said rod 145'will openthe motor switch 113 and, hence, the machine will stop before it becomes bound orlocked.

In an instrument ofthe type described, it is highly important that while the machine is performing an operation caused by the manipulation'of one of the several keys in series a'or b, that all the other of saidkeys be rendered inoperative. To perform the above duty,-I provide a key "1001: 146 that is adapted to be actuatedby the first moved key to lock allthe-other of said keys inoperative. The key lock-146 extends transversely across the'machine'above the arms 18 of the bell crank 18 and-is tiltably mounted'on a rod 147 that is secured at its ends to the frame 15. Formed on each of the arms 18 near their free ends are upstanding lock-actuated lugs 148. The ends of the lugs 148 are adapted to work ina groove 149 formed in the under side of the lock-146. WVhen one of the keys in series a or b is depressed, the bell crank 18 to which the depressed key is secured will be tilted and will remain tilted during the complete operation. The lock-actuated lug 148 on the tilted lever will be raised and the end of said lug will engage a shoulder 150 on one side of the groove 149 in the lock 146 and will tilt said lock to the position shown by dotted lines in Fig. 5. The lock will remain tilted during the complete operation. WVhen the lock 146 is in a tilted operative position caused by the depression of one key, its lower portion 151 will overlie and nearly engage all the other lugs 148- near their free ends and thereby look all but the first moved key in operative during the complete operation. Formed on one side of the lock 146 is a weighted portion 152 that will act to return the lock .to a normal inoperative position at the end of the operation. To keep the lock 146 correctly positioned while inoperative, said lock is provided at the side opposite the weighted portion 152 with a ledge 153 that normally engages inturned' stops 154 on the frame 115.

To keep the racks 33 from meshing too tightly with the pinion26, I provide a transverse stoprod 156 that is secured to opposite sides of the frame 15 inside of the lower arms of the bell cranks 18. When any one of the keys is depressed, the lower arm of the bell crank to which said key is secured will engage the stop rod 156 and limit the inward movement of the rack 33 secured thereto. 1

The instruments" controlled by therkeys 2 to 6, inclusive, are the same, except that the lift lugs 33 on each of the racks 33 are of different heights and, hence, it willonly be necessary to describe the operation of one key in each series. The operation ofthe machine, causedby the manipulation of the key 4 in series a'by which four dots are transmitted, is as follows:

Vhen the key 4 is depressed, the bell crank 18 to which said key is secured will be tilted, thusraisingthe cross bar 31 and releasing the pawl 29 from the ratchet 28*onthe main shaft 27. The rack 33 that is connectedto the tilted bellcrank 18 will engage the long pinion 26, the small lever 23 that coopersurface of the bell crank'l8 near itsfree end and hold said parts in an operativeposition.

As soon as the pawl 29 is released from the ratchet 28,.the shaft'27will be started intoimmediate action by thebooster spring 84. Si

. tor switch 113.

multaneously with the tilting of the bell crank 18, the motor switch 113 will be closed and the magnet switch 121 will be momentarily closed. Thus, the motor 57 will be started and the magnet 100 will be energized. When the magnet 100 is energized, the shipper lever 95 will be drawn toward said magnet 100, the

switches

123 and 133 will be closed thereby, and the clutch fingers 92 on the double-acting clutch member 82 will frictionally engage the clutch surface 92* on the side of the gear 80. When the magnet switch 123 is closed, the magnet 100 will be connected to the line through the switch 123 and mo- The switch 123 will be closed by the shipper lever 95 before the switch 121 opens. Hence, the magnet 100 will remain energized until the motor switch 113 is opened at the end of the operation. lVhen the switch 133 is closed, the springpressed contact 33 on the switch. bar 35 and the fixed contact that cooperates therewith will be operatively connected to the telegraphic circuit 130. It is now apparent that t the motor 57 will drive the main shaft 27 and long pinion 26 through the pinion 67 and large gear 80 at a relatively high speed.

The number of impulses transmitted each time a key in series a or b is depressed is dependent upon the are through which the operatively connected cam wheel 34 or 49 is allowed to rotate. When the key 4 of series a or b is operated, the cam wheels 34 and 49 will rotate through an angular distance sufficient to bring four camming surfaces into contact with the end of the switch bars 35 and 50, respectively. As each of the camming surfaces on the cam wheel 34 raises the end of the switch bar 35, the telegraphic circuit will be closed through the plungerlike contact 35 and the fixed contact 52.

The number of impulses transmitted when any one of the keys 2 to 6 is manipulated is dependent upon the height of the lift lug 33 on the particular rack 33. The rack 33 that is controlled by the keys 4 is provided with a lift lug 33 that is of suflicient height so that the cam wheels 34 and 49 are allowed to turn a distance of four notches on their periphery before the lift lug has returned the cooperating small lever 23 to its normal position to stop the rotation of the shaft 27 and said cam wheels.

lVhen the key 4 in series I) by which four dashes are transmitted is depressed, the switch 121 will be momentarily closed and the magnet 101 will become energized, the shipper lever 95 will be drawn toward said magnet and will close the

switches

124 and 134. When the

switches

124 and 134 are closed, the magnet 101 will be connected to the line through said switch 124 and the motor switch 113, to keep said magnet energized throughout the complete operation, and the plungerlike contact 5O on the switch bar 50, and the cooperating fixed contact 53, will be connected to the telegraphic circuit 130 through the switch 134. The double-acting clutch member 82 will be slid laterally on the sleeve 27 so that its clutch fingers 93 come into contact with the cooperating clutch surfaces on the gear 81, and said gear 81 will become operatively connected with said shaft 27 and said shaft will be driven at a relatively low speed or one-fourth the speed that it is driven while sending dots.

The keys of series a and b that are come spondingly numbered are pivoted to the same bell crank, hence, the only differences in the operation of the machine when keys in series a or Z) of a corresponding number are depressed, will be the speed at which the machine is operated and the particular switch arm that is operatively connected to the telegraphic line.

What I claim is:

1. In a telegraphic transmitting instrument, a shaft, means for rotating said shaft, means for opening and closing a telegraphic circuit, means for operatively connecting said shaft with said means for opening and closing said telegraphic circuit, a series of keys for producing relatively short telegraphic impulses or dots, and a series of keys for producing relatively long telegraphic impulses or dashes, means for connecting each key in each of said series of keys, with said shaft, whereby said shaft is allowed to rotate through different predetermined angular distances when the several keys are manipulated, and means under control of the several keys for positively stopping the rotation of said shaft when the instrument has transmitted a predetermined number of long or short impulses.

2. In a telegraphic transmitting instrument, means for opening and closing a telegraph circuit comprising a rotary mechanism and a non-rotary mechanism, means for intermittently driving said rotary mechanism, a bank of keys divided into two series, means for operatively connecting the keys of one series with the means for driving said rotary mechanism to cause the means for opening and closing the telegraphic circuit to trans mit a predetermined number of dots, means for operatively connecting the keys in the other series of keys to the means for driving the rotary mechanism to cause the means for opening and closing the telegraphic circuit to transmit a predetermined number of dashes, means for positively stopping the rotary member upon completion of a predetermined number of equally spaced dots or dashes, means under control of each of the keys in one series to drive said rotary mechanism at a relatively high speed for making dots, and means under control of each key in the other series to cause said rotary mecha Lil circuit including a rotary and non-rotary mechanism, said rotary mechanism being driven from the shaft, a series of keys for pro ducing dots and a series of keys for producing dashes, a ratchet wheel on said shaft, a

pawl adapted to be actuated by said keys to engage and disengage said wheel, and means severally connecting the keys with the shaft and pawl, whereby the shaft is allowed to rotate difierent angular distances when the several keys are manipulated.

4. In a telegraphic transmitting instrument, a series of keys for sending difl'erent predetermined numbers of dots and a series of keys for sending predetermined numbers of dashes, a shaft, a pinion on said shaft, racks arranged to severally connect said keys with said pinion, switch mechanism adapted to be operated by the rotation of said shaft, means under control of each key in the series of dotproducing keys to rotate said shaft at a relatively'high speed, and means under control of each of the dash-producing keys to rotate the shaft at a lower speed.

5. The structure defined in claim Lin which the keys in each series of keys that send corresponding numbers of impulses cooperate with the same rack.

6. In a telegraphic transmitting instrument, a shaft, means for rotating said shaft,

means for opening and closing a telegraphic circuit, meansfor operatively connecting said shaft with the means for opening and closing the telegraphic circuit, a series of keys, means for operatively connecting said keys with said shaft, whereby said shaft is allowed to rotate through different predetermined angular distances when the several keys are manipulated, and means for automatically stopping the mechanism at the end of an operation in case one of the several keys is accidentally held depressed at the time an operation is completed.

7. In a telegraphic transmitting instrument, a shaft, means for rotating said shaft,

means for opening and closing a telegraphic circuit, means for operatively connecting said shaft with said means for opening and closing said telegraphic circuit, a series of keys for producing relatively short telegraphic impulses or dots, and a series of keys for producing relatively long telegraphic impulses or dashes, means for connecting each key in each of said series of keys with sa d shaft, whereby said shaft is allowed to rotate through different predetermined angular distances when the several keys are manipulated.

In testimony whereof I afiix my signature.

WILLIAM n. ooorER. V