Патент USA US2128385код для вставки
Aug. 30, 1938. F.‘ G. TROISI 2,128,385 TELEPHONE APPARATUS Filed Aug. 29, 1955 2_Sheets-Sheet l . Patented Aug. 30, 1938 UNITED. STATES PATsNrorl-‘lcs ' ' 2,128.”: I F..._..T..‘$Z." ‘ a. Application Aunut 29, 1935, Serial No. 38.408 _ (01.‘ 179-119) ‘ The present invention relates to a telephone in Fig. 1 is a partially exploded view of the tele strument intendedto function in a system as transmitter or receiver, independently of external current sources, and constitutes a continuation phone unit; Fig. tion; , Fig. 4 is a portion of the section along line H oi'Flg. 1 with the parts assembled; In most cases the dia Fig. 5 is a plan view of the diaphragm; ' Fla. 6 is a plan view of the partially assembled unit; and ' maximum amplitudes of vibration and a minia J . Fig. 'i'_ is an. elevation showing one manner in which a pair oithe units may be combined as a mum weight of the moving system. In attempts to balance the mechanical system, balance of the set. magnetic circuit has been overlooked with a re ’ - . A diaphragm it is sandwiched between a spac ing ring i Land an annular boss I2 which is inte gral with and protrudes irom a pertorated cover plate It,‘ whereby an. air chamber is de?ned be tween the diaphragm and cover plate. The spac ing ring it has a bearing upon a plate it which sulting imperfection oi’ sound transmission. Units conforming to the present construction ?nd application for any installations wherein local telephone systems are used, such as for ships. apartment houses, hotels, oi?ces, mines, factories, etc., as well-as for submarine salvage as disclosed in the parent application already referred to. ~ In use as a transmitter, ‘the unit of the present 18 serves as a support for the various elements. The base plate and cover plate are provided with reg istering openings 55 and it respectively, for the invention derives its actuating current from the sound vibrations impressed upon the diaphragm, reception oi assembly screws. Another set 01' openings provided in the cover plate are intended to receive‘ screws for attachment to a‘housing, obviating the need for batteries or other external current sources. As a receiver, the unit converts not shown, for enclosing the working parts in the incoming electrical currents to sound waves 30 which are reproduced by the diaphragm. While especially intended for use without external cur-» rent sources, the interposition of a battery or \ is a sectional elevation taken along line - ‘3-3 of ‘Fig. 1 with the parts in assembled rela phragms oi such instruments have been strained beyond desirable limits in an attempt to obtain 25 ' system, partially broken away. 5 in part of my application Serial Number 713,023 ?led on February 26, 1934. Due to inherent defects and general ine?lciency, instruments of the soqcalled batteryless type heretofore constructed, have failed to meet with 10 commercial success. . Fig. 2 is a detail of portionsvoi the magnetic watertight condition. I a \ - Secured to the base plate it by-bolts I1, is the assembly for effecting the induced current: in 30 response to the voice or other sound frequencies impressed upon the diaphragm. This assembly comprises a permanent horseshoe magnet i8, pole Faithful reproduction is obtained throughout pieces IS, an armature 20, an armature housing the audio frequency range with units of the pres-=_ 2 I, a winding it properly insulated fromthe me 85 other current source in the circuit is also con templated. - ent construction, by virtue of the proportions oi’ tallic structure, and means for holding the various the various masses and arrangements resorted to. elements in -' assembled relation and properly Undue damping is avoided, and injury to the spaced. A pinzt couples the diaphragm assem- parts is prevented. bly to the armature. to which elements its re- w , . The armature oi? the electromagnetic circuit is supported in a truly balanced condition, and measures are taken to preserve a balance of the magnetic circuit as a whole. - " - v Sound vibrations impressed upon the diaphragm spective ends are positively connected, though ad .justably, by solder or the like. The bolts i'i have their heads countersunk in the base plate, their‘ shanks extending through thesarne- with a forced ?t in order to maintain them'in rigid, spaced relation. The spacing of 45 these bolts is such, that the ends of the horse shoe magnet, it are nicely received therebetweeh 1 of transmitter or receiver alike, represent more nearly the mean values, (whereby distortion is overcome and the diaphragm is subjected to smaller strains than in known structures. . and irictionally ‘held thereby. . Counterbored 50 It is with the object of overcoming the faults of openings formed near the opposite ends oi’ the prior constructions and of attaining the ends, magnet, receive, the screws 24 which threadediy already outlined, that the present invention is engage the pole-pieces it to fasten the same to proposed, the details of which will be understood ‘ the‘poles of the magnet. Each of the pole-pieces from the following description in conjunction is preferably ‘termed from a ?at sheet of mag-_-' with the accompanying drawings, ‘ netic material, which is out to ‘a substantially T- u 1 2 3,128,385 ’ shape, the horizontal bar of the T tending to converge at its extremities by virtue of a slight taper on its lower edge. In assembled relation, these pole-pieces each have a vertical portion con tiguous to and coextensive with the poles of the horseshoe magnet. One end of each of these vertical portions (in Fig. 2'» the upper end oi‘ the left hand pole-piece and the lower end of the right hand pole~piecel joins a horizontally ex 10 tending portion which is substantially ‘coplanar surface of the magnet. Also, the bar II prefer~ ably bowed downwardly at its central pi rtlon so as to resiliently bear against the horizontal por tion of the upper pole-piece 3B. The lower pole piece is also given a de?nite bearing surface against the base plate by designing the latter in the manner shown in Fig. 6. The central aper ture of the base plate is formed of two concentric semi~circles of different radii. Thus the smaller semi-circle 37! leaves su?icient material to sup with one of the planes of the horseshoe magnet. The tips of the pole-pieces are formed by folding inwardly towards the axial plane of the perma~ nent magnet, a pair of wings which constituted the horizontal bar of the original T. These wings or tips of the respective pole-pieces extcnu to pm" "t the pole~piece without unduly damping the wards one another, but are maintained in a pre— terminated in the planes of the pole-piece sur determined spaced relation by .a series of lugs t5 extending from the armature housing. A light weight armature 20 of magnetic mate 20 rial, and substantially rectangular in plan, has a short perforated integral lug 25 extending cen-u di While the larger semi-circle it pro vides a suf?ciently large passage ‘ r air within the instrument so as not to interfere with its sensitivity and operation. As shown in Fig. 4, the armature faces so as to be cut by substant flue: emanating therefrom. preferably ‘ To p age ‘through fatigue, the armature lug as short as possible, and to allow for ie solder or the like applied thereto for holding the pin trally from one side thereof. Parallel to the side .25], the rear surfaces of the pole-pieces are pro bearing the lug 26, on a line passing through the vided with grooves 40. A further and more im~ portant function of these grooves, is the balance 25 center of gravity of the armature, a pair of opens ings are formed, symmetrical with respect to said of the magnetic‘ system which is achieved center of gravity, through which the ends of a thereby. The projecting lug 25 tends to decrease supporting pin 21 are passed. The pin is prefer~ the reluctance of the gap at the rear of the pole~ ably a length of resilient wire having its ends pieces, which factor is compensated by reducing the area of the pole faces at this point. Conse Ill) 30 bent at 90° to their base, forming a pair of par allel arms. The base of the pin is permanently quently, the torque applied at the opposite sides attached to the armature, as by soldering or the .of the fulcrum provided by the pin 21 will be likepindlcated at 2B. equalized and likelihood of distortion dimh'lished.v The ends of the pin 21 are‘ received in openings After the diaphragm i0 is clamped into posi formed in the upper surface of a one-piece arma- . tion, the pin 23 is inserted'through the opening ~ ture housing 2| which is of rigid, light nonmag» . in the lug 26, and with the armature assigned netic materialfpreterably metal. The armature is centered in its housing, whereupon the pin ends are riveted and a?ixed ‘to the housing by 40 soldering or the like. The housing comprises a top surface, a pair of side Walls perpendicular thereto, opposed base portions spaced ‘from one another and parallel to the top surface, and care fully calibrated lugs 25 projecting from both ends of both side walls, making four in all. The upper and lower edges of all of these lugs 25 lie in two parallel planes, for the purpose of spacing the pole pieces IS. The base of the housing, being discontinuous, prevents to a large extent, 50 the effects of eddy currents. , Bridging the gap between the base portions of the armature housing, there is provided an insulating block 29, which in conjunction with its insulating wrapping 30, spaces the spool 55 ?anges 3| of insulating material, which are pro vided with elongated slots for the reception of the armature housing. Thus, except for its lugs 25, the armature housing serves as a core for the magnet winding 22 which is formed upon the 60 wrapping 30 and between the ?anges 3|. These elements are held in assembled relation by bend ing the four lugs 25 outwardly along their line of junction with they housing proper. After the predetermined number of turns of suitable guage 65 wire have been applied on the spool, an insulat ing covering 32 is wrapped about the coil so formed. A clamping bar 33 of non-magnetic material is provided with openings for the reception of the 70 threaded ends of the bolts H, for clamping the assembly to the base plate upon application of the nuts 34. The bar is provided with a pair of locating pins 35, preferably pressed from the material '01’ the bar itself, which pins are received in a pair of cooperating openings in the upper to its ?nal neutral position with respect to the opposed pole tips, the pin is ?xed to the lug. Should the diaphragm subsequently become bent, or should there be need of adjustment for an other reason, the pin may be readjusted with respect to the armature lug and a new joint formed. The ends of the winding 22 are brought out to a suitable terminal block 41, from which they are 45 connected to their respective conductors for completing a circuit with one or more similar units. ‘ The diaphragm I0 is preferably a thin disk of resilient flexible material, such as duralumin, 50 highly responsive to voice frequencies, which in the form shown, has been impressed with a series of concentric corrugations, the spacing and depth of which in general, increase as their diameters decrease. 55 Whereas it is usual practice in devices of this type to solder or otherwise connect the center of the diaphragm directly to the pin which trans mits the movements to or from the armature, more reliable and generally better reproduction 60 has been obtained in this construction by trans mitting movements between diaphragm proper and the pin through an intermediate, substan tially rigid member which is supported at a plu rallty of points on the diaphragm. To prevent undue damping of the diaphragm, this member is attached at the peak of a corrugation, being otherwise out of contact with the diaphragm. This connecting member 42 which is prefer ably of light yet rigid construction, has a body portion of substantial cone shape, terminating at its base in a rigldifying bead 43, extending from which, there are a plurality of short stiff lugs 44 which are perforated for the reception of rivets 45 for attachment to the diaphragm 76 3 2,128,885 at the peak of a corrugation 48. After the parts have been riveted together, solder is preferably applied to therivet heads to assure an air-tight and substantial joint, after which a coating of a waterproof and plastic material such as a wax‘ is applied over the solder. . As shown, three lugs connect the member 42 with the diaphragm, this number having been chosen as a-balance between light weight .and 10 rigidity, both of which factors are important. magnet, depending upon the direction of the current. Thus the armature will become unbal aneed and be caused to vibrate about its fulcrum, which vibration will be transmitted to the re ceiver diaphragm and be emitted as sound waves. U! Fig. 7 depicts a pair of such telephone units assembled as a hand set, having a single casing for the units, the cable being led into the casing through a watertight stuffing box. Although the construction .of the telephone Whether the movements are transmitted from _ units especially adaptsthem to use in connec the diaphragm to the armature while the unit tion with submarine salvage apparatus, they have been highly successful in other uses and ' serves as a transmitter, or from the armature to the diaphragm when in use as a receiver, a 15 more nearly perfect reproduction is effected than with a. pinconnected at a single point to the their application is not to be restricted beyond the scope of the appended claims. 15 center of the diaphragm. The number of such lugs may be varied without departing from the spirit of the invention.’ The air chamber between the diaphragm and 20 the diaphragm cover is designed with respect to the moving system, that is, the diaphragm, its pin and the armature, so that when a. plurality 1. A telephone unit comprising a permanent magnet carrying a pair of detachable pole pieces, an electromagnet embraced by said pole pieces, said electromagnet comprising a spool having 20 separate ?anges and a discontinuous one-piece sheet metal armature housing having elements holding said spool in assembled relation and pro jecting between said pole-pieces and in contact therewith for limiting the positions of the latter. 25 2. A telephone unit comprising a permanent > of the units are connected in a circuit, the cir cult will be substantially uniformly responsive to frequencies throughout the audible range. I claim: The resonance of a unit used as a receiver will , ‘magnet carrying a pair of pole-pieces, an elec be di?erent than when it is used as a trans mitter, due to a change of its effective air chamher, and the number of different resonant fre quencies of the system will be increased, tending to render uniform the output of the system over the entire audible range. tromagnet embraced by said pole-pieces, said electromagnet comprising an armature and a. one-piece sheet metal housing therefor, a spool 30 composed of a plurality of elements formed about said housing, said housingI carrying lugs engag ing and holding the spool in assembled relation As appears inFig. 3, the length of the pole - and contacting said pole-pieces for spacing the 35 tips is necessarily slightly greater than the length of the armature housing for the lugs 25 to per form their function of spacing these pole tips uniformly. > ‘ latter. 3. A telephone unit comprising a base plate carrying a pair of spaced bolts, a horseshoe mag net carried by said base plate having its legs in ' or. receiver interchangeably. and due to their frictional engagement with said bolts, pole-pieces carried by said magnet having surfaces coplanar construction, operate emciently under the high with those of the magnet and a clamping bar pressure conditions to which they are frequently subjected as in under water salvage operations receiving said bolts ensasins coplanar surfaces of said magnet and-said pole-pieces for. clamp These telephone units operate as transmitter . when used as a transmitter, the vibrations of 45 the diaphragm set up by the voice, are imparted to the balanced armature through the pin a. The movements of the armature in the ?eld of ing the same to said base plate. “ v 4. A, telephone unit comprising a horseshoe magnet having a pair of oppositely directed pole pieces rigidly attached thereto, said pole-pieces the permanent magnet, vary the reluctance of . having surfaces coplanar with those of the mag net, a clamping bar engaging the upper surfaces ' the magnetic circuits with a frequency propor tional to that of the sound waves producing these movements. Accordingly, proportional currents will be induced in the winding, which currents will be carried to similar units serving for the instant as receivers. When current flows in the to of a pole-piece and the magnet and having posi tioning pins received by apertures in the magnet, a base plate engasing the lower surfaces of a - pole-piece and the magnet, and means for asso— ciating said clamping bar with said base plate receiver winding, magnetic ?ux will be produced to oppou or reinforce that of the permanent HORENTmO G. 'I'ROISI.