US1194765A

US1194765A - Distbict of colttmbia

Info

Publication number: US1194765A
Authority: US
Publication date: 1916-08-15
Anticipated expiration: 1933-08-15

Description

0. P. MOORE.

TELEPHONE RECEIVER.

APPLICATION FILED JULY 30; :913.

1,1 94,765. Patented Aug. 15, 1916.

4 SHEETS-SHEET 1.

99 mm 7- 6 771m D. P. MOORE TELEPHONE REQWER; APmcme'w was JULY 30. 1913.

Patented Aug. 15, 1916.

4 SHEETS-SHEET 2.

Q Q m w 97.8% W1 E M D. P. MOORE.

TELEPHONE RECEIVER.

APPLICATION FILED JULY 30, I9I3.

1 1 94,765. latol'afed Aug. 15, 1916.

4 SHEETS-SIIEET 3.

pawn

PELTON MOOItE,'OF WASHINGTON, DISTRICT OF COLUMBIA.

TELEPHONE-RECEIVER.

Specification of Letters Patent.

Patented Aug. 15, 1916.

- -mation filed July 30, 1913. Serial No. 781,990.

To all whom it may concem:

Be it known that 1, DAVID PEL'mN Moons, a citizen of the United States, residlng at Washington, in the District of Columbia, have invented certain new and useful Improvements in Telephone Receivers, of which the following is a specification.

This invention relates to improvements in telephone receivers, and more particularly to that type by means of which the sound is greatly amplified, without affecting the articulation, one object of the present invention being the provision of a receiver, 1n which the diaphragm is not unduly stressed and in which the armature is connected thereto by a lever. or system of levers, that multiply the vibratory movements of the diaphragm when the armature is affected.

A further object of the present invention is the provision of means for adjusting the coi1, whereby the air-gap is varied without varying the stress upon the diaphragm.

A still further object of the present invention is the provision of means for adjusting the coil to vary the adjustment of the pole thereof relatively to the fulcrum point of the armature, thus to increase or decrease the distance of the magnetic eflect thereof upon the armature. I

In designs of receivers heretofore used in connection with loud telephones, both for announcing purposes and in connection with sound reproducing machines, the diaphragm has been placed under varying stresses, either by adjusting the lever connected to the diaphragm, or the armature to and from the pole of the coil to vary'the air-gap. In these, the main objection lies, and this has been borne out by experiments, in the connection with the diaphragm that has either too great or too little flexing action upon the diaphragm, such effect eitherplacing too great or too-little stress u on the diaphragm. It has been discovered t at the best 'results are attained both as to loudness and articulation, when there is-practicallv no stress upon the diaphragm, and also when the periphery of the diaphragm is clamped firmly and not mounted with one or more cushions. In order therefore, to mpunt the diaphragm as above set forth with practically no stress thereupon, and to properly vibrate the same to produce the highest efliciency in sound reproduction: the armature is fulcrumed' to one pole of a permanent magnet while the free end, which is connected to the lever or levers for operating the diaphragm, dis posed to be above the pole of the ccil or electro-magnet which is attached to be influenced by the remaining pole of the permanent magnet. This electro-magnet, however, is the adjustable member and is so mounted as to be moved to and from the armature to vary the air-gap and to and from the 111- crum point of the armature to vary the point of attack of the pole relatively to the armature.

To more clearly explain the manner of carrying out the above, attention is invited to the accompanying drawings, in which Figure 1 is a side elev.tion of the preferred form of receiver, partly in section, made according to and embodying the present invention. Fig. 2 is a view looking from above that as shown in Fig. 2. Fig. 3 is a section taken on line 3--3 of Fig. 1. Fig. 3 is a detail view of the electromagnet and the means for varying the air-gap. Fig. l is a view partly in section of a system of levers for'vibrating the diaphragm. Fig. 5 is a longitudinal section thr'ough a modified form of receiver employing two diaphragms and a central collecting chamber. Fig. 6 is an end view thereof. Fig. 7 is a section taken on line 7-7 of Fig. 5. Figs. 8 and 9 are detail views of the mounting for the electromagnet shown in Fig. 5. Fig. 10 is a view in elevation of the diaphragm chamber as shown in Fig. 1 with means for conveying and amplifying the sound vibrations at both sides of the diaphragm. Fig. 11 is a view illustrating the same principle as applied'to the receiver shown in Fig. 5. Fig. 12 is a view similar to Fig. 4, in which the flat spring is dispensed with... Fig. 13 is a side elevation partly in section of still. another modified form of receiver. Fig. 14 is a section taken on line Pie-1416f Fig. 13. Fig. 15 is a section taken ,on line 1515 of Fig. 13. Fig. 16 is a detail view showing the method of mounting the adjusting screw for the receiver shown in Fig. 13.

Reierring to the drawings, and more particularly to Figs. 1, 2, 3, and 3, the numeral 1 designates a bi-polar permanent magnetot usual form, the terminal or pole 2 thereof being shorter than the pole 3, which is slightly reduced. The frame, com used of the arms 4 and 4, is supported rom the ma et 1, and carries the inner member 5, which with the outer member 6 forms the support for the diaphragm I. This diahragm ma he of mica. or phosphor bronze, both of vihii h have been found excellent for this work. rod or stem is-connected in the usual manner to the diaphragm. and is connected to the lever 9, which is pivoted at to the arm 4, a flat spring 11, being seated in the free end of the lever 9 and mounted in the log 12 carried by the arm l. This spring may be dispensed with as shown in Figs. 4 and 1:. but it has been found that it tends to maintain the lever 9 parallel with the diaphragm and to relieve the stress thrown upon the diaphragm. A. plate 13 onnects the lever J to the pin 14 carried by and in the free end of the armature 15, whose point of fulcrum is upon the outer face of the reduced end of the pole 3, the lug '16 preventing the same slipping outwardly. The coil 11' has the outer end of its pole l8 disposed adjacent the armature 15. the end if), as shown in l igs. 1 and 3. being projected within the space between the poles 3 and 2, and having an aperture 20. in which is mounted the eccentric or cam 21. keyed at 2). upon the stem 23. This stem is mounted for rotation within the exteriorly threading adjusting sleeve 24. mounted in the threaded bores '5 and 21 of the arm 4 and the pole 2. respectively. Thus by rotating the stem :23, the pole l is moved to and from the armature l5 and thus the air-gap varied without :i ecting the relative position of the lever 9 and iiittpltl'flgl'lll. To move the coil laterally and thus m-iae the end of the pole 1h near to or farther away from the pole i). and therebv vary the fulcrum of the armature. the inner end of the sleeve Ill bears against the end ll) of the pole and is opposed by the cone spiral spring '38. which rests against the opposite side of the end it) of the pole and the nonmagnetic. plate :29 in which the inner end of the stem :23 is seated. The recessed head no of the sleeu- Z4 is milled so that the sleeve may be readiiv adjusted. The milled head 27 of the stem 2-3 is disposed for ready access.

in the form illustrated in Figs. U, T, 8 and a. the sound collecting chamber 150 has the horn attaci ing member 31 at one side. the two diaphragnis 7' and 7". being mounted at; opposite sides and plfll'kl'lfv clamped by the rings 5'. This receiver is a double one, and has two permanent magnets 32. of the watchcase type atmpposite ends. ()ne of the respecti'v'e pole pieces ii and CH. is provided with the fuieruming block 3. mrresponding to the pole 3 heretofore described. supporting armature i5. whose pin 1 is connecttal by the plate 13' to the lever 9. This lever is supported at it), and is connected to the diaphragm by the stem 5. A flat spring 11 is mounted in the free end of the lever 9, and corresponds to the spring 11. heretofore described. A block 35 is mounted for sliding movement by means of the screw 36, While the screw 37 adjnstabl'y connects the inner end 19' of the pole piece 18', of the coil 17' to the block. The inner end of the pole 18', as shown in Figs. 5 and 8. is mounted in the pole piece 34 of the magnet 32 for sliding movement. so that when the screw 37 is mar posed between the diaphragm T" and the.

armature l5" the free end of the lever 9, being connected by the plate or rod 39 to the lever 38 nearer the fulcrum point of the lever 38, a stem 8* connecting the free end of the lever .55 to the diaphragm clamped in the members 5 and a. Thus the coil 17* a tl'ects the armature which through the rod 13. actuates the levers i and 38, to multiplv the distance of vibration in the diaphragm and consetpiently increase the loudness of tone given off thereby. The number of levers 3b ma v be varied.

As shown in Fig. 10, the chamber 6' carries the amplifier tube (3 for the main amplifier 4T. while to collect the vibrations at the rear of the diaphragm a chalnber (3 is provided and leads into the sleeve (3 and the auxiliary amplifier 4S.

in Fig. 11, the form of receiver shown in Fig. I is employed, the chamber having its tube ill attached to the main amplifier i l. the two auxiliary chambers 40 and 41 being connected to collect the sound vibrations from the outer sides of the two diaphragms (not shown) and through the tubes l2 and 43, come) them to the two auxiliary amplifiers l5 and -16. respectively.

By the arrangements as shown in Figs, 10 and 11, the greatest efficiency in sound collcction is secured. these devices being particularly designed for use in connection with announcements at railroad stations and the like. and for talking and singing motion pictures.

In the form of receiver shown in Figs. 13, 14, J5 and 10, there is no provision made for varying the lateral position of the coil. 17*, relative to the fulcrum point of the armature 15, the member 49 of the permanent magnet having the armature fulcrum end 50 and being connected by the member 51, to slidably support the member 53 of the permanent magnet, the spacing lug 52 of the member 51 and the a jacent portion of the magnet member 53 being provided with the sliding connection 54. The free end of the magnet, member 53, is slidably connected in a similar manner at 56 and 57 to the spacing block and the arm 4. In order to move the magnet member 53 consequently vary the air-gap, a bore 58 is formed in the end of the member 53, the "threaded nut 59 being slid in the slot 60 from the sideto receive the adjusting screw 61. This screw is provided with the annular shoulder 62 at a fixed point, and this is rotatable withinlthe bore 63 of the member 51, the thimble the operating end 65, looking the parts as shown in Fig. 16, so that thescrew 61 may be manipulated by the milled head 66 to longitudinally slide the magnet mem ber 53 and the coil 17*. a

What I claim, as new, is

1. A telephone receiver, including a permanent magnet,-an armature, a diaphragm operatively attached to the armature, a coil having its pole in attractive relation to the armature and under the influence of the permanent magnet, means adjustable at will for 'moving the coil to vary the air-gap between its pole and the armature, and means also adjustable 'at will for moving the coil to vary the position of the pole relative to the fulcrum of the armature.

-2.'A telephone receiver, including a permanent magnet, a diaphragm, a support for the diaphragm, a pivoted lever having its free end operably connected to the diaphragm, the pivot of the lever being fixed,

an armature operably connected to the lever, a longitudinally and laterally slidable coil connected to the permanent magnet and ha ing its pole in attractive relation to the ar mature, and manually adjustable means for sliding the coil to vary its relation to the armature.

3. A telephone receiver, including a permanent magnet, a diaphragm, a support for the diaphragm, a lever having one end operably connected to the diaphragm, a fixed pivot for the other end of the lever, an armature operably connected to the lever, a longitudinally and laterally slidalile-coil under the influence of the permanent magnet, and manually operable mear to: moving the coil to vary the air-gap beta-ecu the pole of the coil and the armature. A

4. A telephone receiver, including a permanent magnet, a diaphragm, a support for the diaphragm, a lever having ong end opprably connected to the diaphragm, a fixed pivot for the other end of the lever, an armature operably connected to the lever, a coil under the influence of the permanent magnet, manually operable means for moving the coil to vary the air-gap between the pole of the coil and the armature, and a second manually operable means also for moving the coil to vary the position of the pole of the coil relatively to the fulcrum of the armature.

5. A telephone receiver, including a bipolar permanent magnet, one pole of which is longer than the other, a longitudinally and laterally slidable coil connected to the other pole of the magnet, an armature tulcrumed upon the longer pole of the permanent magnet, a diaphragm operably connected to the armature, and manually operable means for sliding the coil to vary the airgap between the pole thereof and the armature.

6. A telephone receiver, including a bipolar permanent magnet,one pole of which is longer than the other, a longitudinally and laterally sli'dable coil under the influence of the shorter pole, an armature ulcrumed upon the longer pole of the permanent magnet, a diaphragm operably connected to the armature, and manually operable means for moving the coil to vary the air-gap between its pole and the armature.

7. A telephone receiver, includin a bipolar permanent magnet, one pole 0 which is longer than the other, a coil under the influence of the shorter pole, an armature fulcrumed upon the longer pole of the permm nent magnet, a, diaphragm operably connected totheiarma'ture, means for moving the coil to vary the air-gap between the pole thereof and the armature, and means for moving the coil to vary the position of the pole thereof relatively to the fulcrum point i of the armature.

8. A telephone receiver, including a permanent magnet, a diaphragm, a longitudinally and laterally slidable coil having its pole under the influence of the permanent magnet, an armature under the influence of the pole of the coil, leverage multiplying meansconnecting the diaphragm and armature, and manually operable means for mov ing the coil to vary itsrelation to the armature, without changing the relative positions of the armature and the diaphragm.

9. A receiverhavinga bipolar permanent magnet, anarmature fulcrumed to one pole and extending above the other pole thereof, an electromagnet, T a longitudinally and laterally movable carlrier for the electromagnct disposed in magnetic relation to the perm? nent magnet, and manuallyz cperable means A for moving the carrier and its electromagnet to vary the relation of the pole of the electromagnet to the armature.

10. A receiver, including a bipolar per manent magnet, one pole of which is longer than the other, an armature fulcrumed to the longer pole and extending toward the polar permanent magnet, a coil under the for holding it against transv'erse movement influence of one pole thereof, an armature and for moving the coil to place its polerelatively to the fulcrum point of the armafulerumed upon the other pole of the permanent magnet, a diaphragm operably conture. nected to the armature, means for moving 16. A telephone receiver, including a diathe coil to vary the air gap between the phragm, an armature operably connected poles thereof and the armature, and means thereto, a bi-polar permanent magnet, one for moving the coil to vary the position of pole of which extends beyond the other to the pole thereof relatively to the fulcrum form a fulcrum for the armature, a coil havpoint of the armature. ing its pole, piece elongated and projected 12. A telephone receiver, including a between the poles of the permanent magnet permanent magnet, an armature actuated and in magnetic attraction to the short pole, diaphragm, a coil slidably connected to the a spring interposed between the extension permanent magnet for longitudinal and and one pole of the permanent magnet, an lateral movements relative to the armature, adjustable screw disposed to engage the opand means for moving the coil. posite side of the extension to cooperate 13. A telephone receiver, including a with the spring to regulate the position of permanent magnet, an armature actuated the coil relatively to the fulcrum point of diaphragm, a coil slidably-connected to the the armature, and oscillatory means engagpermanentmagnet for longitudinal and 'ing the extension to impart longitudinal lateral movements relative to the armature, manually operable means for imparting longitudinal movement to the coil, and a second manually operable means for immrtingvlateral movement to the coil.

movement to the coil tore ulate the air gap between the armature an the poleof the ,coil. v

17. A telephone receiver, including a diaphragmyan armature operably connected 1-l.,1\ telephonen-eceiver, including a dia--/.thereto, a bipolar permanent magnet, one

phragm, an armature operably connected thereto, a bi-polar permanent magnet, one pole. of which extends beyond the other to form a fulcrum for the armature, a coil dis- 7 posed for longitlulinal and transverse sliding movements between the poles and having its pole under the influence of the short pole of lhe permanent magnet, and means for moving the coil to regulate the position of its pole to the armature.

15. A telephone receiver, including a diaphragm, an armature operahly onnected thereto, a bi-polar permanent magnet, one pole of which extends beyond the other to form a fulcrum for the armature, a coil having its pole piccc elongated and projected between the poles of the permanent 1uagnet. and in magnetic attraction to the short pole, means engaging the pole extension to hold it between the poles of the permanent magnet and for imparting longitudinal movement to the coil, and cooperahle means engaging the extension upon opposite sides pole of: ,which is longer than the other and forms a fulcrum for the armature, acoil having its pole piece extended and projected between the poles-of the permanent magnet and in magnetic attraction to the short pole, a spring interposed between the extension and one pole of the permanent magnet, an

auljuslable screw disposed to engage the.

opposite. side of the extension to cooperate with the spring to-regulate the position of the coil relatively to the fulcrum point of the armature, said extension being provided with an opening therein, and a stem actuated cam mounted in said opening, whereby the oscillation of the stem and cam imparts longitudinal movement to the coil.

in testimony whereof I afiix my signature in presence of two witnesses.

DAVID PELTON MOORE.

\Vitnesses a E. II. PARKINS, M. L. \VnrrmoK.