US833279A - Telephone-receiver. - Google Patents

Description

x ease of a telephone-receiver of hard rubber, the magnet mside the case being fastened to.

UNITED STATES PATENT oEEreE.

HENRY F. ALBRIGHT, OF NEW YORK, N. Y., ASSIGNOR TO WESTERN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF v TELEPHONE-RECEIVER.

Application filed Febrlry 5, 1904. Serial No. 192.180.

and useful Improvement in Telephone-Re-- eeivers, of which the following is a full, clear, Y

concise, and exact description.

My invention relates to a tele hone-receiver; and its object is to provi` e an imroved receiver which will be cheap to manuacture and extremelyT efiicient.

It has been usual heretofore to make the the rear thereof, the' ear ieee screwing over the outside of the front o the case to hold the diaphragm in position opposite the polar end of the magnet. This construction has been rather expensive because of the amount of rubber required, and there is the further and more serious objection that changes of temperature will produce different degrees of expansion in the steel magnet and inthe hardrubber case to which the magnet is fastened at the rear and which supports the diaphragm in front, so that the dia hragm is not mainv tained in a constant an unvarying relation to the magnet-pole.

My invention contem lates improvements in structure by which t e above-mentioned objections are overcome and a further feature of my invention contemplates an arrangement v by which it is made possible and practicable to use a tubular magnet, which 1s the ideal form of magnet for telephone-receivers, since it will act symmetrically upon the diaphragm.

I Will particularly described the preferred form of my invention by reference to the accompanying drawings, in Which- Figure 1 1s a side view of my improved receiver. Fig. 2 is a longitudinal sectional viewv thereof. Fig. 3 is a view showing the several disassembled parts of the receiver to illustrate how they are put together. Fig. 4 is a view, in partia cross-section, on line 4 4 of Fig. 2. Fig. 5 is a cross-sectional view on line 5 5 of F10. 2. Fig. 6 is a detail View of the disk to whici the rear c'ap ofthe receiver is attached,l and Fig. 7 is a detail view of the core and magnetizing-helix of the magnet.

The same letters of reference are used to designate the same parts wherever they are shown.

- The tubular magnet comprises an outer shell or cylinder a and an inner core ci', magneticallyl united with the shell a at the rear by means of a disk a?. The winding b is provided at the front end of the magnet surrounding the core a inthe space between said core and the shell or cylinder a. Near the front of themagnet a non-ma ietic metallic cup cis permanently fastene upon the shell a, so that the polar ends of the magnet formed by the free ends of said core and shell are eoncentrically disposed within said cup. The cup c is provided with a flange c, upon which the diaphragm d rests in operative relation to the concentric poles of the tubular magnet. The core a and shell c are preferably permanent magnets, forming, in effect, a permanent horseshoe-magnet which will be strong and less liable to deinagnetization, whose action upon the diaphragm will be very symmetrical, and whose condition will be permanent andconstant. It will be seen that these poles will act upon the circular diaphragm symmetrically and will therefore lmake the telephone-receiver more efficient than where two magnet-polesA are simply placed side by side behind thediaphragm. The cup c being of metal and fastened to the metallic cylinder a of the magnet, it will be seen that any variations in temperature will notlatfect th'e distance between the magnetpole and the plane of the diaphragm, which should of course be kept constant ui order to lsecure the best results.

The rubber earpiece e fits against the end of the diaphragm and is provided with threads upon its periphery. The earpiece is clamped 1n position to hold the diaphragm against the flange c of the cup by means of a metal clamping-ring f, which has an inner lip or rim at the rear adapted to engage the flange c of the cup and threads upon the forward portion of the interior adapted to screw upon the threaded earpiece e. The several parts are thus securely fastened in position b screwing the clam i and earpiece together. t may be mentionedhere that this construction is vextreemly effective to prevent tampering with the receiver, since when the parts are tightly screwed together it is practically irnpossible for an ordinary person to take them apart. Y

At the rear of the tubular magnet a threaded disk g is provided, upon which a metal cap Patented Get. 16, 1906.

h is adapted to screw. A11 insulating-block 7c, supporting terminal pieces k k2 for the conducting-wires which lead from the winding b,

is supported upon said disk g, the block and `disk being fastened to the rear of the magnet by a screw Z. A bracket i, may be carried by. the insulating-block, to which a tie-cord may be attached in a Well-known mannerto relieve the conducting-Wires from strain. The terminal pieces 7c k2 may be connected with studs k3 lc, passing through the block, to which the Wires leading from the magnethelix may be attached.` The screws which carry the terminal pieces may be inserted in holes drilled through the block,vthe screwhole c for terminal c, however, alone being shown in the drawings. lThe cap h is provided with a hole through which the flexible conducting-wires may be led to the terminal pieces upon the block k.

A hard-'rubber shell lm may be slipped over the cylindrical portion a of the tubular magnet before the parts at the rear are assembled. A disk n may be interposed between the disks a2 'and g to form a seat-or abutment for the rubber shell 'm and the cap h, and pins o o` maybe carried by the disk a2, adapted to pass through the holes 'n' n in disk ln and holes g g in disk g into the block lr to prevent rotation of said parts: Holes g2 g2 are provided in disk g for the passage of the conductingwires leading from 'the helix to the terminals k k2. An insulating-disk p may -be' interposed between the insulating-block lc and disk g to prevent short-circuiting of the terminals on said disk, said disk being provided with holes p p for the passage of said pins 0 o. The screw Z passes through block 7c, perforation p2 of disk p, hole g3 in disk g, hole n2 4in disk n, into the rear of the tubular magnet.

I claim- 1. In a telephone-receiver, the combination with a tubular magnet having a magnetizing-helix surroundin .the core thereof, of a diaphragm supported efore the poles of said magnet, an insulating-block carrying termi- I nals for said helix lsecured at the rear of said magnet, and a cap secured at the rear of said magnet and inclosing said block and terminals, said cap having a hole therein to admit conductors to said terminals.

2. In a telephone-receiver, the combination with a tubular magnet having a magnetizing-helix surrounding a portion of the core thereof, of a non-magnetic cup flaring outwardly from the outer shell of said magnet, the free ends of said core and shell being concentrically disposed within the cup, a diaphragm supported over said cup in operative relation tosai'd poles, means for clamping an earpiece uponsaidcup over said diaphragm, an insulatine-bleek secured to the re arof said magnet and aving terminals thereon for'said helix, and a cap secured between the rear of said magnet and Said block and inclosingsaid block and terminals, said cap having an opening therein to admit conductors to saidterminals.

3. In a telephone-receiver, the combination with a tubular magnet and a magnetizing-helix therefor, of a cup carried by said magnet at the forward end and supporting a diaphragm in operative relation to the magnet-pole, an earpiece and means for clamping the same upon the cu to hold the diaphragm in position, a har -rubber sleeve fitting over the body of the magnet, a threaded disk of substantially the diameter of the magnet-cylinder fitting upon the rear end of said magnet, an insulating-block having terminal pieces mounted thereon, a screw fastening the insulating-block and threaded disk to the rear end of the magnet-cylinder, and a cap fitting over said insulating-block and screwing upon the threaded disk, said cap having a hole in its end through which iiexible conducting-wiresmay be passed to connect with the terminals upon said block.A

4. In a telephone-receiver, the combination with a tubular magnet having a magnetizing-helix surrounding the core thereof, of a diaphragm supported before the poles of said magnet, au insulated block secured at the rear of said magnet, terminals for said helix carried by said block, and a cap inclosing said block andl terminals and secured in place between the vmagnet and insulated block, said cap havinga hole therein to admit conductors to said terminals.

5. In a telephone-receiver, the combination with a tubular magnet and a magnetizing-helix surroundin the core thereof, of a diaphragm supporte before the poles of said magnet, an insulating-block secured to the rearl of said magnet, having terminals thereon for said helix, a disk interposed between said block and magnet, and a cap fitting over said block and adapted to be secured to said disk, said cap having a hole therein to admit conductors to said terminals.

6. In a telephone-receiver, the combinartion with a tubular magnet, of a cupfsecured to the shell of said ma et and flaring outwardly therefrom, the s ell being concentrically disposed Within'the cup, a diaphragm su orted by said cup opposite the poles of sai magnet, an earpiece, means for clamping said earpiece upon said cup over said diaphragm, an insulating-block secured to the rear of said tubular magnet and carrying terminals for said helix, a disk secured between said block'and magnet, and a cap fitting over said block and adapted to be secured to said disk, said cap having a hole therein to admit conductors to said terminals. l

7. In a telephone-receiver, the combination with a tubular rn'agnet havin a magnetizing-helix surrounding the'core t ereof, of a diaphragm supported before the poles of said IOO IIO'

.magnet, an insulating-block at the rear of 13o said magnet and passing( said magnet having terminals thereon for said helix, pins connecting the rear of said magnet with said block, a fastening member passing through said block into the rear of said magnet, and a ca secured at the rear of said magnet and inc osing said block, said cap having an opening therein to admit conductors tosaid terminals.

` 8. In a telephone-receiver, the combination with a tubular magnet havin y a magnetizin -helix surrounding the core thereof, of a diaphragm supported before the poles of said ma net, an insulating-block at the rear of sai magnet and having terminals thereon for said helix, a disk interposed between said block and magnet, pins secured to the rear of into the insulating-bloc a screw passing through said block and disk into the rear of said ma net, and a metal cap fitting Vover said bloc and secured to said disk, said cap having a hole therein to admit conductors to said terminals.

9. In a telephone-receiver, the combination with a central magnetqcore, of a magnetizing-helix surrounding a portion thereof, a.

tubular shell of magnetic material inclosing -upon the edge of thecup in o erative relation to the endsof said core an return polepiece, an earpiece iitting over the diaphragm aving threads u on its periphery, an internally-threaded c amping-ring. engagin the` edge of the cup, said clamping-ring eing adapted` to receive the earpiece, which screws into 'the same, thereby clamping the diaphragm between the earpiece andthe hrough said disk edge of the cup, an insulating-block secured to the rear of said tubular magnet and carrying terminals for said helix, and a `cap secured between said ma et and block and inclosing said block an terminals, said cap having a hole therein to admit conductors to said terminals.

10. In a telephone-receiver, the combination with a tubular magnet having a magnetizing-helixsurrounding a portion of the core thereof, of a diaphragm supported before the l'poles of said magnet, an insulating-shell itting over said magnet, an insulating-block carrying terminals for said helix mounted at the rear of said magnet, and a metal cap h securedv at the rear of saidmagnet and inclosing said block, said cap being secured in place between said block and magnet.

11. In a telephone-receiver, the combination with a tubular magnet having a magnetizing-helix surrounding a portionof the core thereof, of a non-magnetic metal cup united with the outer shell of said magnet, the free ends of said core and shell being concentrically dis osed within the cup, a diaphragm clampe upon the edge of said cup, an insu- .lating-sleeve'iitting upon the shell .of said ma et and abutting against the rear of sai Ucup, an insulated block carrying terminals for said helix su ported at the rear'of said magnet, a meta cap secured between said magnet and block and inclosing said 'block and terminals, and conductors leading thilough an opening in said cap to said termina s.

Y In witness 4whereof I hereunto subscribe my name this 25th day of November, A. D.

HENRY F. ALBRIGHT. Witnesses:

-J BAUCKER, W. L. CoURsEN.

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