US1479688A

US1479688A - Telegraph transmitter

Info

Publication number: US1479688A
Application number: US534327A
Authority: US
Inventors: Freeman W Wright
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-02-06
Filing date: 1922-02-06
Publication date: 1924-01-01
Anticipated expiration: 1941-01-01

Description

Jan. '1, 1924 1,479,688

F. W. WRIGHT TELEGRAPH TRANSMITTER Filed Feb. 6. 1922 Patented Jan. 1, 1924.

UNITED STATES FREEMAN W. WRIGHT, OF VENEZIA, ARIZONA.

TELEGRAPH TRANSMITTER.

Application filed February 6, 1922. Serial No. 534,327.

To all whom it may concern Be it known that I, FREEMAN W. WVRIGHT, a citizen of the United States, residing at Venezia, in the county of Yavapai and State of Arizona, have invented certain new and useful Improvements in Telegraph Transmitters, of which the following is a specification.

Thisv invention relates to automatic telegraph transmitters used in apparatus for teaching telegraphy; and it consists in the novel construction and combination of the parts hereinafter fully described and claimed whereby a reception of the same message or sequence of telegraphic characters is prevented.

In the drawings, Figure 1 is a plan view of a telegraph transmitter constructed according to this invention, and with some of the character wheels omitted. Fig. 2 is a side view of the same. Fig. 3 is a side view showing a set of three character wheels, each having a different number of characters. Fig. 4: is a diagram showing the electric circuit.

When students are learning to receive messages, the most efficient practice copy to send them is a jumbled series of letters, numerals and signals, the sequence of which is being constantly changed, so that it is impossible for the student to anticipate what he is going to receive, or to memorize what he receives. A transmitter constructed according to this invention is preferably driven continuously by any approved means or motor, and it affords the student practice of the best possible kind.

The instrument has a base 7 preferably formed of insulating material. A cam wheel 8 is provided having a groove 9 at its periphery, and this cam wheel has an inclined track 6. This cam wheel may conveniently be formed of two plates spaced apart to form the groove, and having helical tongues partially punched out from its peripheral portion to form the helical or inclined track. The main portion of the groove is horizontal, and its ends are open and are arranged out of line with each other.

The cam wheel 8 is mounted to revolve on a pin 10 secured to the base, and is revolved by any approved means. A toothed driving wheel 12 is secured to the hub of the cam is operatively connected with it.

A series of

character wheels

15, 16 and 17 is provided, and these wheels are, arranged in sets of three. They arespaced apart on the base around the cam wheel, and are insulated from each other and from the cam wheel. Twenty-four character wheels may advantageously be provided. The character wheels are all similar to each other, and each one is journaled in a bracket 18 which is secured to the base 7. Each separate character wheel has teeth 19 which project radially from its periphery, and which are spaced at substantially equal distances apart. The teeth of all the wheels have raised characters 19" on their ends, and these characters correspond with the characters used in telegraphy, and which are adapted to transmit or reproduce the standard dots anddashes. The teeth 19 and the characters 19 are arrangedcrosswise on the wheels, so that the characters of each wheel are all parallel to its axis and to each other, and each character wheel is mounted'on a separate axis which is out of line with the axes of all the other character wheels. The wheel 15 has preferably 15 teeth; the wheel 16 has 16 teeth; and the wheel 17 has 17 teeth. The wheels are preferably arranged in the

order

15, 16, v17, 15, 16, 17, in sets of three. The groove in the cam wheel engages with the teeth of the character wheels, and the ends of the cam groove are arranged out of line to a predetermined extent so that each character wheel is revolved for the space of one of its teeth at each revolution of the cam wheel. The teeth engage looselywith the groove, so that all the wheels are revolved step by step irrespective of the number of their teeth.

The spring contact arm 20, of a make and break device, is secured to a pillar 21 which projects from the cam wheel 8. The cam wheel is preferably formed of metal, and the arm 20 has a projection 22 at its free end portion which engages with the raised characters 19' on the ends of the wheel teeth. A spring contact piece 24 is also secured to the free end portion of the arm 20, on the other side of it from the projection 22. A contact screw 25 is mounted in a pillar 26 which is insulated from the cam wheel 8 by insulation 27, and which is arranged in circuit with a commutator plate 28 securedconcentric with the cam wheel, and also insulated from it. An arch-shaped arm or brush 3O bearson the commutator plate 28, and is attached to a binding post 31 on the base. The pillar 21 on the cam wheel is connected in circuit with a binding post 32 on the base, a line wire 33 being connected to the post 32 and to the insulated pin 10 on which the cam wheel is journaled.

A suitable sender key 34, a sounder 35 and a battery 36 are provided, and are connected together and to the

binding posts

31 and 32 in series, by line wires 38, as shown in Fig. 4c.

Ihe characters on the teeth of the character wheels engage with the projection 22 on the spring arm of the make and break device, one after another, and vibrate the spring arm, so that the battery circuit is completed and closed, and the characters are reproduced audibly by the sounder. Characters selected from the character wheels of the series are reproduced one after another in the regular order of the series of wheels and one from each wheel.

As the adjacent character wheels of each set have a different number of teeth and characters, and as the wheels are revolved step by step selectively, by the cam wheel, no two characters are reproduced in the same sequence, except perhaps at such long intervals or time as to be negligible. The cam wheel causes a different character to be lined up with the make and break device each time the circuit is closed so as to actuate the sounder. The

character wheels

15, 16 and 17 forming each set, of three wheels, are revolved step by step, but they are not revolved synchronously. All the wheels of the series however having the same number of said "characters being arranged parallel to each other, and each character wheel being mounted on a separate axis and certain of the said wheels having a different number of characters from the others, a single make and break device which is operated by all th'e'said characters, and means tor'revolving the character wheels step by step selectively and placing the selected characters in engagement -withthe make and break device in regular order.

'2. In a telegraph transmitter, a series of character wheels provided with radial teeth having raised characters, said characters being-arranged parallel to each other, and each character wheel being mounted on a'separate axis-and certaino-f the wheels having a differ'ent number of teeth and characters from step by step selectively and placing the seincense lected characters in operative engagement with the make and break device in regular order.

3. In a telegraph transmitter, a cam wheel, a series of character wheels revolved step by step by the cam wheel and having 7 raised characters, certain of the said wheels having a different number of characters from the others, a make and break device carried by the cam wheel, and means for revolving the cam wheel to place the make and break device in engagement with one character of each wheel one after another.

4. In a telegraph transmitter, a cam wheel having a peripheral groove, a series of char acter wheels provided with teeth having raised characters, said teeth engaging with the said groove so that the wheels are revolved step by step, certain of the said wheels having a different number of teeth and characters from the others, a make and break device carried by the cam wheel, and means for revolving the cam wheel to place the make and break device in engagei'nent with the characters.

5. In a telegraph transmitter, a series of character wheels arranged circum ferentially around a common center in similar sets said wheels having raised characters, each character wheel being mounted on a separate axis and having its characters arranged parallel to its axis and to each other, and the wheels comprising each set having each a di'fie rent number of characters, a single make and break device which is operated by the said characters, and means for revolving the character wheels step by step selectively and placing the selected characters in operative engagement with the make and break device in regular order.

"6. In atelegr'aph transmittena wheel, a character wheel provided with teeth :having raised characters, said teeth engaging with the cam wheel one after another, a make and break device carried by the cam wheel, and means for revolving the cam wheel to rotate the character wheel step by step and place the make and break device in engagement with a difi'e'rent character 'at' each revolution of the cam wheel.

'7. In a telegraph transmitter, a cam wheel having a peripheral fgroove one portion of which is helical and which has 'epen ends arranged out of line with each other, a character wheel provided with teeth having raised characters, said teeth being engaged by the said groove one-after another, a make and break device carried by the cam wheel, and means for revolving the 'cam wheel to place the make and'break device in engagement with the said character's one after another.

8. In a telegraph transmitter, a cam wheel,

a toothed character'wheel engaging with the cam wheel and having raised characters, a

spring contact arm and a contact piece carried by the cam wheel and normally insulated from each other, and means for revolving the cam wheel to rotate the character Wheel step by step and to place the spring arm in engagement with the said characters one after another and also close the between the spring arm and the said contact piece.

9. In a telegraph transmitter, a cam wheel, a toothed character wheel engaging with the said cam wheel and having raised characters, a spring arm and a contact piece carried by the cam wheel and normally insulated from each other, a commutator arranged concentric with the cam wheel, and in circuit with the said contact piece, a brush arranged in contact with the commutator, and means for revolving the cam wheel to actuate the character wheel and to close the circuit, the said contact arm being pressed against the said contact piece by means of the said characters.

10. In a telegraph transmitter, a cam wheel, a toothed character wheel revolved step by step by the cam wheel and having raised characters on its periphery, a spring contact arm supported by the cam wheel and having a projection on one side for engaging with the said characters and having a spring contact member on its other side, a contact piece supported by the cam wheel adjacent to the said contact member, the said spring arm and contact piece being normally insulated from each other, and'means for revolving the cam Wheel to revolve the character wheel step by step and press a difl'erent character on the said projection, thereby actuating the spring arm and closing the circuit between the said spring contact member on the spring arm and the said contact piece.

In testimony whereof I have afiixed my signature.

FREEMAN W. WRIGHT.