US1000499A - Telephone-transmitter. - Google Patents

Description

W. W. DEAN.

' TELEPHONE TRANSMITTER.

APPLICATION rum) APR. 2-1. 1901;.

Patented Au 15, 1911.

j M: i: :g,

Invaar 135* WIHJEIB Ban .A urns a amen-a Um'rnn sTATEs Parana. O FICE;

WILLIAM W; DEAN, seame 0310, ,ssslenon TO, THE DEAN ELECTRIC COMPANY,

- or mama, OHIO, A CORPORATION or 011m.

wefle'm; i Be it known that'lfwini, \"M V. DEAN, a citizen of the United States, residing at. Elvria, in, the' countyr ot'Lorain and State of Ohio l ave invented a'rei't'ain. new 'and Improved ,Tel'eplioneillran sinitter, of which ,thel following is"ra jfi ll, clear, concise, and

exact description, r'et'erei'ice being bad to the accompanying drawings, torming a part efthis specifiestron. V

, My inveiitionj relates to transmitters for use in telephone work, and it belongs 'to that type of instruments in which granular or comminuated material, as'carbon, is used for the purpose of varying the resistance of the circuit including the transmitter and thus .turnishing fa m'eans for, transmitting theroicewaues. I

nMy invent"nbohsists essentially in providing a transmitthfjwith a diap'hragmhav: ing a reinforced ditterdge or periphery, and I make use of t-lii" reinforcing portion or flange to support the diaphragmat its.

,outer edge and thus constitute an edge bearing all around the circumference of the diaphragm :The diaphragm is adapted to engage and vibrate a resistance cup or chamber which be of ordinary construction containing two or more electrodes of suitconstruction,

" tat-k" tlttfltransmitter,

able material and having granular material of cmuparatively high resistance between the electrodes h'trinventiou also consists in so forming the diaphragm that the expansion of the same due to the heat produced by'the how of current throughthe resistance material contained in the cup or chamber will tend to separate the electrodes in the chamber and thus true the granular material rather than to.brin j the el cti'odes closer together and thus cou'iprcs granular material or N Br iuy iurer'ititf rl erure a larger effective area;of (Iraphragln, since the usual cushioning ring. arolrifl the periphery of the same 13 omitted and the action ot the diap'lnagnu is clearer amt. better, since the removal of this mishiouing ring, also re moves a teutle'ncv to i'uutlle'ithe vibrations of .tbe;IlihyihraQan. Another disadvantage of the eu'shig L feliminated by y ts in eliminating mental diaphragm due'to the aging and h'ecu'shioning ring,

all strain upon;

gradual com-p 1 JJ 'rELErnonE- rmnsm'rmn.

v Specification of Letters Patent. Patented Aug 15, 1911. application filed April 24, 1905. Serial-No. 428,938."

v'vhich gradual compression; followed up by the tensioning springs of the transmitter,

has in the past produced serious distortion of the supplemental diaphragm, resulting in many cases in 'a very inefficient relation of the parts of the resistance cup or chamber. In tny construction I avoid all results of this character by seating the bearing edge around the circumference of the main diaphragmupon a ring of hard, practically nonrompressible insulating material, such as mica, oiled linen, fiber or similar material.

As a result of the construction indicated, by my invent-ion the parts of the transmitter retain their proper Working position practically indefinitely, and the transmitter is not subjeetto deterioration for the reasons usually combining to require repair of transmitters after being used for some time. My invention also makes it possible, to form .the main diaphragms more accurately than heretofore, and as constructed in accordance with my invention these dia phra-gms retain their proper shape much better than the ordinary form of diaphragms heretofore used.

The several drawings illustrating my invention are as followsr Figure 1 is a sectional view through the transmitter assembled; Fig. 2 is a back view of thetransmitter shown in Fig. 1, with the transmitter shell removed: Fig. 3 is a view ot,,a, ,portion of the Bridge and shows the t'ensioninp springs of .the transmitter; Fig. 4 is an enlarged sectional viewof the workin'g parts ofthe transmitter assembled; Fig. 5 is a view of the parts shown in Fig. 4, such parts being separated to more clearly indicatetheir nature and construction; Fig; I) is an edge view of a portion of the bridge of the transmitter and shows the partssupported thereby. a

Similar numerals refer tosimilar parts throughout theseveral views.

Referring to the drawings, the frontplate .t has formedtherein an annular recess extending nearly to the circumference of the front plate, and in this recess is supported tirsta disk of waterproof/material 6, which more durable than rubber, etc, not being.

subject to what: is commonly known as stacking. slacking is due to a process of oxidation. When slacked, the rubber gasket becomes hard and brittle, failing absolutely to erform the functions for which it is used.

,5 The main diaphragm 4 is supported against the ring 5 by its engagement with the resistance cup 7 which on is su ported'by the stud 9 from the bri ge 2 y'ineans of'a block 10 secured to but insulated from such 10 bridge. The bridge 2 is supported from the front plate 1 by suitable screws, as indicated. V

The cup 7 consists of a body portion adapted to receive the electrode 17 which is secured in place by a suitable nut as indicated, and opposite this electrode 17 a second electrode 18 is $11 ported by means of the supplemental diaphragm 19, secured against one side of the cup .7 by the screw ring 20. The electrode 18 is adapted to engage the stud 9, which operates to clamp the supplemental diaphragm 19 securely between such stud and the electrode 18. 4 The diaphragm 1 is centrally perforated and a flange 4" is formed around this opening which extends toward the back of the transmitter, such flangebeing adapted to fit the outer surface of the resistance cup 7 and rest against the edge of the clamping ring 20. Tension springsll, 11, supported by -but-- insulated from the bridge 2 are provided, which rest againstthe clamping ring 20 on its rear face, and at diametrically opposite points for the purpose of placing the desired tension upon the diaphragm 4 and thus holding the diaphragm firmly against the insulating ring 5.

When the parts are assembled, the stud 9 is free to. move in the block 10until the parts have been given their final position,

in which condition the screw 16 is tightened,

thus holding the stud 9 securely in the block 10 which .is supported by butinsulated from the bridge 2. The tension springs 11, 11 are also supported by but insulated from the bridge 2.

The diaphragm 4 has formed around its outer periphery a flange 4 extending toward the front of the transmitter, which flange performs the function of reinforcing the diaphragm and also presenting an edge bearing to the insulated material 5, which permits avery free movement of the diaphragm 4 when vibrated. The outer edge of this flange4 is carefully turned off and thus trued up after the diaphragm is formed by means of suitable. dies. The diaphragm 4 is dished slightly, as indicated in Figsfit and 5 the center of the same extending slj htly in front of the outer portion, as a resultof which when the diaphragm is heated by the heating of the resistance cup,

due to the flow of current therethrough, the- 5 expansion of the oentralportionof the diain electrical connection with a block 12- phragm will deflect such portion forward or toward the front of the transmitter and thus tend to unpack the transmitter. By this conformation of.

of this heating action is absolutely prevented, and it s impossible for the heating of the diaphragm to pack the transmitter.

The blocks 10 and 12, supported by but insulated'from the bridge 2, constitute the terminals of the transmitter and connect-ion may be' made to these blocks by suitable screws-15 and 13.

The shell 3, indicated in Fig. 1, is provided for rotectin the parts of the transmitter, an this shel is supported from the front plate by screws adaptedto engage the posts 14 extending from the front plate to the rear.

While I have shown my inyention in the particular embodiment herein disclosed, I

do not limit'myself to this construction, but desire to claim broadly all equivalent means for producing the same result.

What I claim. is: I

1. In a telephone transmitter, a casing. carbon resistance varying means supported from said casing and adapted to form part of an electric circuit and means to increase the resistance of said resistance varying means when the flow of current there through is increased.

' 2. In a telephone transmitter, a casing, a diaphragm sup orted by the casing and adapted to be v1 rated by sound waves, and resistance-varying means operated by such e diaphragm, motion 'ofthe central portion to the rearas a result diaphragm and adapted to form part of an electric circuit, .such diaphragm being dished outwardly to increase the resistance of such means when heated.

3. In a telephone transmitter, a casing, a diaphragm supported by the casing and adaptedto be vibrated by sound waves, and

resistance-varying means operated by such diaphragm and adapted to form part of an electric circuit, such diaphragm being dished outwardly to increase the resistance of such therethrough.

4. In a telephone transmitter, a casing, a

diaphragm sup orted by the casing and adapted to be vi rated by sound waves, such vmeans when heated by the flow of, current v diaphragm flanged at its outer edge, and resistance-varying means operated by such diaphragm and adapted to form part'of'an electric circuit, such dia hragm being dished outwardly to increase t e resistance of such means by the flow of current therethrough.

' 5. In a telephone transmitter, a casing, a. diaphragm supported by the casing and adapted to be vi rated by sound waves, such diaphragm having a peri heral flange extending at practically rig tangles'to the plane of the diaphragm, and resistancevarying means operated by such diaphragm and adapted to form part of an electric circuit,such diaphragmbelng dished outwardly 4m increase the resistance of such means when heated.

(5.111 a telephone transnntter, a caslng, a

diaphragm supported by the casing and adapted to be vibrated by sound waves,such

diaphragm provided with an edge bearing around its peri iihery, and resistance-varying means operated by such diaphragm and adapted to form part of an electric circuit,

such diaphragm being dished outwardly to increase the resistance of such means when heated by the flow of current therethrougln 7. In a telephone transmitter, a frontplate, a diaphragm bearing against but insulated from the front plate, abridgesupported from the front plate back of the diaphragm, a granule chamber located between springs bearingupon such chamber serving to hold the diaphragm in position against.

the front plate.

8. In a telephone transmitter, a front plate, a diaphragm bearing against but insulated from the front plate, a bridge supported from the front plate back of the diaphragm, a granule chamber located between such bridge and the diaphragm, electrodes in such chamber for directing electric current -in position against the front plate.

through the material in the chamber, such diaphragm so dished as to separate such electrodes and thereby agitate the granules by the flovi of current therethrough. and springs bearing upon such chamber serving to hold the diaphragm in position against the front plate.

9. In a telephone transmitter, a front plate, a diaphragm bearing against but insulated from the front plate, a bridge supported from the front plate back of the diaphragm, a granule chamber located between .such bridge and the chamber, electrodes in such chamber for directing electric current through the material in the chamber, the

central portion of such diaphragm dished outward whereby the resistance between the electrodes is increased by the flow of current between them, and springs bearing upon such chamber serving to hold the diaphragm 10. In a telephone transmitter, a front plate, a diaphragm bearing against but in sulated from the front plate, a bridge supported from the front plate back of the diaphragm, a granule chamber located between such bridge and the diaphragm, and electrodes in such chamber for directing electrie current through the material in the chamber, the central portionof such diaphragm dished outward, whereby the electrodes in such; chamber are separated, the granules contained therein are agitated and the resistancesbetween the electrodes is increased by the fiowof current betweenthcm.

11-. In a telephone transmitter, a front plate, a diaphragm bearing against but in-I sulated from the front plate, such diaphragm reinforced around its periphery, a bridge supported from the frontplate back of the diaphragm, a granule chamber located between such bridge-and the diaphragm, electrodes in such chamber for directing electric current through the material.

in thechamber, such diaphragm being dished outwardly to increase the resistance between the electrodes by the flow of current therethrough, and springs bearing upon, such chamber serving to hold the" diaphragm. in position against the front plate. I

V 12. In a telephone transmitter, a front plate, a diaphragm having a peripheral flange formed thereon tocbear against nonyielding insulation supported. by the front plate, a: bridgesupported from the -front plate back ofthe 'dilapl'ira'g'm', a granule chamber located between such bridge: and

, the diaphragm, electrodesin, such chamber for directing electric current; through the material in the-"chamber, such diaphragm being dished outwardly to support such electrodes and thereby agitate ,thegranules, by the flow of current therethrough; r and springs bearing upon such chamber serving to hold the diaphragm in position against the front plate.

13. In a telephone transmitter, a front plate, a diaphragm having a flange around its peripherv at practically right angles to the plane of the diaphragm, the outer edge of such flange constituting a rocking edge bearing against non-yielding insulation supported by the front plate, a bridge supported from the front plate back of the diaphragm, a granule chamber located between such bridge and the diaphragm. electrodes in such chamber for directing electric current through the material in the chamber, the central portion of such diaphragm dished outward whereby the resistance be tween the electrodes is increased when can rent flows between them, and springs hearing upon such chamber serving to holdthe diaphragm in position against the front plate.

14. In a telephone transmitter,- a front plate,'a diaphragm bearing against but insulated from the front plate, a bridge supported from the front plate back of the dia phragm, a granule chamber located between such bridge and the diaphragm. electrodes in such chamber for directing electric current through the material in the chamber,

,such diaphragm being'dished outwardly to increase the resistance between the electrodes by the flow of current therethrough, and

'means for holding the diaphragm 1n positoseparate such electrodes and thereby agi-,

fate the granules by the flow of current therethrough, and-means for holding the diaphragm in position against the frontplate.

16. In a telephone transmitter, a front plate, a diaphragm bearing against but in-- sulated from the front plate, a bridge supported from the front plate back of the diaphragm, a granule chamber located between such bridge and the chamber, electrodes in such chamber for directing electric current through the material in the chamber, the central portion of such diaphragm dished outward whereby the resistance between the electrodes is increasedby the flow of current between them, and means for holding the diaphragm in position against the front plate.

17. In a telephone transmitter, the combination of a plate, a' diaphragm resting thereagainst, a granule chamber, an electrode therein partaking of the movements of the diaphragm, granules in said chamber,

a second electrode fixed with respectto said.

diaphragm, said diaphragm dished outwardly to agitate the granules when a current passing between said granules is changed as to strength.

18. In a. telephone transmittervthe combination of a plate, adiaphragm resting 'thc'reagainst, a granule chamber, an electrode therein partaking of the movements of the diaphragm, granules in said chamber, a

second electrode fixed with respect to said diaphragm, said diaphragm being dished outwardly to agitate the granules when the strength of current flowing through the transmitter is changed. 4 In witness whereof, I hereunto subscribe my name this 20 day of April A. D. 1908.

WILLIAM DEAN;

Witnesses:

A. D. T. Liner, S. A. BEYLAND.

Copies of this patent may be obtained tor'flve cents each, by addressing the Commissioner 0! Patents Washington, D. O.

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