US1246895A

US1246895A - Phonograph-transmitter.

Info

Publication number: US1246895A
Application number: US87386114A
Authority: US
Inventors: Henry C Egerton
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1914-11-25
Filing date: 1914-11-25
Publication date: 1917-11-20
Anticipated expiration: 1934-11-20

Description

H. C. EGERTON.

PHONOGRAPH TRANSMITTER.

APPLICATION FILED NOV. 25, 1914.

1,246,895. Patented Nov. 20, 1917.

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PHONOGRAPH TRANSMITTER.

APPLICATION FILED NOV. 25. 1914.

Patented Nov. 20, 1917.

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UNITED STATES PAT T OFFICE.

HENRY c. EoEnroN, or rassarc, NEW JERSEY, AssIcNon, BY rmsNn ASSIGNMENTS, T0 wns'rEaN ELECTRIC COMPANY, xNconron-nrnn, A conronarro or ew 203x.-

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Patented Nov. 20, 191 '1.

Application and November 25,1914. Ser1al1Io.878,861.

To all whom it may concern: Y

Be it known that I, -HENRY O. Eonn'roN, a citizen of the United States, residing at Passaic, in the county of Passaic and State of New Jersey',-'have invented certain new and useful Improvements in Phonograph- Transmitters, of which the following is a full, clear, concise, and exact descriptlon.

-This. invention relates to transmitting apparatus, and more particularly to a transmitter for transmitting to a circuit the vibrations of a phonograph record.

The object of this invention is to provide a com act and eflicient structure of this class in 'WhlCh the various elements are mounted in. a unitary structure and are constructed and combined .to produce the best operation. According to one feature of this invention the resistance varying means, the stylus and a motion reducing lever system for transmitting the movement of the stylus to the resistance varying means are all carried by a sin le compact casing.

cans are also provided for transmitting to the resistance varying means only push and pull impulses, caused by the engagement of the stylus with the sound reproducing undulations. This feature consists in the'use of a connecting means between the stylus and the lever system, which connecting means is rigid with respect to push and pull vibrations applied thereto longitudinally, but is flexible with respect to laterally applied vibrations.

A third feature of the invention relates to the means provided for adjusting the transmitter structure to different angular positions, whereby the stylus may receive and transmit to the resistance varying means either lateral or vertical vibrationsreceived from a record in order that the device may be operated with either of the forms of commercial records...

tion- Figure 1 is a front elevation view with the casing removed of a device embodying this invention;

Fig. 2 is a cross-section of the device shown in Fig. 1; r

Fig. 3 is a bottom view-of the device; Fig. 4 is a rear elevation view of the device with the casin removed; I

Fig. 5 is a detai pers ective view showing the arrangement of t e lever system;

In the drawings illustrating this inven-- Fig. 6 is a view in side elevation of a sup-- porting arm with the device shown in oneof its angular positions; a Fig. 7 1s a plan view of a record with which the device works when in the position shown in Fig. 6;

Fig. 8 is a view in side elevation of the device in a diiferent angular position from,

that shown in Fig. 6; v

Fig. 9 is a sectional view of the record with which the device cooperates when in the position shown in Fig. 8; and I Fig. 10 is a detail view of the mounting for the device. a

- In the drawings, 5 designates a frame memberhavinga centrally located web or plate 6 in which ar'e mounted two transmitter buttons. Each transmitter button comprises a container 7, a .stationary electrode 8, a movable electrode 9 and a resistance varying medium 10 located between the statlonary and movable electrodes. Mounted upon the web 6 is a bridge piece 12', which supports a lever 13, said lever being supported upon said bridge piece 12 by means of pivoting screws 14,141. The end of the lever 13 is connected with the movable electrode 9 of one of the transmitter buttons, the movable electrode 9 of the other button being connected to said lever upon the oppo site side of its pivotal support. The other end of the lever 13 is extended, as shown at '15, and .is connected with a second lever 16 frame-member 5 by means of screws 20 and I 21 which engage the frame member 5. Inserted between the bottom face of the lever 16 and the heads of the

screws

20 and 21 are

rubber buffer members

22, 22, the purpose of these buffers being to efliciently dampen the movement of the-vibratory member or stylus 17. In order to make the operation of v these buflers more positive and their posi.-. tion more -important mechanically, the

which is sufliciently stifi" to resist flexure when push and pull vibrations are applied longitudinally thereof, but flexing readily in response to transversely applied vibrations. This connecting means extends through a slot 28 in a post or extension 29 carried by the lever 16 and is secured therein preferably by applying a drop of solder thereto. The post or extension 29 is shorter than that portion of the stylus 17 which extends below the lever 16 for engagement with the record of the phonograph, whereby the vibrations of said stylus, in response to the record, are reduced in amplitude'in their transmission to the lever 13. Byreason of the above described characteristics of the connecting member 25, the vibrations set up in the stylus by irregularities in the record other than those designed to operate on the stylus, and particularly such irregularities as tend to vibrate the stylus in a direction other than the direction in which it is to be vibrated by the reproducing undulations, will not be transmitted to the transmitter buttons, thereby eliminating undesirable and confusing sounds which might other- I wise be transmitted.

End members

35 and 36 secured to the frame plate 5 inclose the transmitter buttons and form with said frame plate 5 a complete casing. Secured to the end member 35 and extending therefrom is a bracket member 38 which is provided with an opening adapted to receive the end of a bracket arm 39, which is screw-threaded to receive a thumb nut 40. The upper face of the bracket member 38 is provided with two notches or

recesses

41 and 12 extending at approximately right angles to each other, and adapted to separately engage a projection i3 provided on a collar 44 on the end of the bracket arm 39. When the transmitter is in the position shown in Fig. 6 with the notch or recess 42 engaging the projection 4.3, the lever system will be in such a position that lateral movements applied to the stylus by a record will swing the lever 16 about its pivots and transmit vibrations to the transmitter buttons, in accordance with the lateral undulations of the record. By loosening the thumb nut 40 and swinging the transmitter through an angle of approximately ninety degrees until the notch 41 engages the projection 43 on the collar 44 and clamping the device in position, vertical vibrations applied to the stylus will cause'the lever 16 to swing about its bearings, and transmit to the transmitter buttons movements in accordance with the vertical undulations in a record with which the stylus engages.

The bracket arm 39 is pivotally mounted upon bearing member 50-to swing in a vertical direction, said bearing'member 50 being pivotally supported in a forked member 51 to swing laterally. A member 52 is provided for retaining the transmitter in an elevated position when it is removed from the record.

In order to more fully insure against undesirable vibrations in the transmitter sys tem, rubber bushings 56 are provided between the bracket member 38 and the end member 35.0f the'casing.

The movable electrodes of the transmitter buttons are connected by means of

conductors

60 and 61 with

binding screws

62 and 63, while the circuit connection for the 'stationary electrodes is through the framemember 5 to which is secured a binding screw 64.

Three conductors 65, 66-and 67 are connected with binding screws or

posts

62, 63 and 64.

What is claimed is:

1. In a phonograph transmitter, a main lever arm, a microphonic element actuated thereby, an auxiliary lever arm, pivotal supporting means therefor, a stylus carried by said auxiliary lever arm, and'a resilient rod rigidly secured to and connectingsaid lever arms and extending at right angles thereto whereby vibration of said stylus in a direction parallel with said rod will be transmitted to said main lever arm and vibrations of said stylus in a direction transverse to said rod will not be transmitted to said main lever arm.

2. In a phonograph transmitter, a main lever arm, two microphonic elements actuated thereby, pivots for the main lever arm located intermediate said-microphonic elements, an auxiliary arm, a pivotal supporting means therefor, a stylus carried by said auxiliary lever arm and a resilient rod connecting said lever arms and extending at right angles thereto whereby vibrations of said stylus in a direction parallel with said rod will be transmitted to said main lever arm and vibrations of said stylus in a direction transverse to said rod will not be transmitted to said main lever arm.

3. In a phonograph transmitter, a main lever arm, a microphonic element actuated thereby, an auxiliary lever ,arm extending in a plane parallel to said main lever arm, pivotal supporting means for said auxiliary lever arm, a stylus carried by said auxiliary lever arm and a resilient rod connecting a stylus carried by said auxiliary lever arm and a resilient rod connecting said lever arms and extending at right angles thereto whereby vibrations of said stylus in a direction parallel'to said rod will'be transmitted to said main lever arm and vibrations of said stylus in a direction transverse to said rod will not be transmitted to said main lever arm.

5. In a phonograph transmitter, a supporting framework, a main lever arm, a microphonic element actuated thereby, an

auxiliary lever arm comprising a stylus arm and a mounting plate, means to pivot said mounting plate on sa1d supporting framework, resillent means for holding said plate in engagement with said pivoting means and a resilient rod connectingsaid main and auxiliary lever arms and extending at right angles thereto, whereby vibrations of said stylus in a direction parallel with said rod Will be transmitted to said main lever arm and vibrations of said stylus in a direction transverse to said rod will not be transmitted to said lever arm.

6, In a phonograph transmitter, a vvariable resistance, means including a granular resistance material and electrodes coacting therewith, a stylus to engage a phonograph record, a lever system connecting said stylus with said variable resistance means, supporting means for said lever stem, means to change the angular positlon of said lever means and a stylus relative to said supporting means whereby the vertical or transverse movements of said stylus will be transmitted to said resistance means; said resistance means being arranged so that said electrodes extend in a substantiall upright position'whether said stylus is positioned for vertical or transverse movement.

In witness whereof I hereunto subscribe my name this 23d day of November, A. D.

HENRY C. EGERTON. Witnesses:

E. EDLER, K. L. Sum.