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Aug. 6, '1946. w. a. NEILD 2,405,514 CARBON FILE VOLTAGE REGULATOR Filed March 8, 1944 _ '10 21 I9 16 11 /P Y , 18 . ‘ INVENTOR. , WillidlnG.A€ild_ BY W ATTGRNEY _, ‘2,405,514 Patented Aug. 6, 1946 UNITED STATES PATENT orrics 2,405,51FL CARBON PILE'VOLTAGE' RE GULATOR» William .G..Neild,,Warren P.0int, N. J ., assignorto Bendix . Aviation. Corporation, Teterborn, N.v .I.,.. acorporation of Delaware Appli‘cati'onMarch 8, 1944; Serial N 0; 525,585 4 Claims. (Cl. 201?—51.) 1 2 Thisinvention relates to‘ carbon pile electric regulators‘ and is concerned primarily with the means provided for varying the‘ pressure on the this.- idea out, in a: practical embodiment, the in» vention» contemplates the‘ use, of a. plurality’ of such springs which maybe equi-angularly- shaped about the circular-armature and which springs serve to maintain the armature in proper posi tion. sociated with a generator for the purpose of con An’ important phase; of the invention resides in trolling the voltage. across‘ the generator; Such the construction of these springs which are de a carbon pile regulator includes a carbon pile signed so‘ thatthe resistancewhich they offer in made up of a plurality‘of carbon discs and" which is connected in series'with- the ?eld of the gener 10 creases with movement of the armature towards. the magnetic pot, and. the‘ degree of increase is ator. As the pressure‘on the carbon pilevaries, carbon pile. A carbon pilevoltage regu1ator is ordinarily as the strength‘ of the ?eld'is correspondingly varied and the generator regulated. substantially thesameas theincrease in magnetic force on the armature-'as-the- latter approaches the pot. It is now common practice to employ mag Yet another object of theinvention is the'pro-e netically actuated means for’ varying the pressure 15 vision, in a carbon pile voltage regulator of the on the- carbon pile. Such magnetic-means. com character aforesaid, of novel spring means of' the prises a'magnetic'pot, including'a core, and Which type noted, which also includes instru-mentalities pot houses the-usual solenoid coil. An armature for properlypositioning the springs and armature which is disposed inoperative relation toone end of the carbon pile is'arranged to be affected by 20 carriedrthereby with respect to the pot. This end is achieved'by, stamping each spring from a metal changes in the magnetic’ force generated by the lank, so as to leave portions of the blank which solenoid. Inasmuch as this solenoid- is- connected donot=function assprings, but:si-mply as position across the generator the strength of the magnetic ing means. ?eld which it produces will vary in accordance Various» other more detailed objects. and. ad 25 with Variations in the voltage of the generator. vantages-of the invention such as arise in. carry It is now‘a well recognized’ and accepted fact ing, out the above noted. thoughts in'a practical that the magnetic force on the armature must 'be embodiment will in part become apparent and in opposed in some manner, and this is usually ac part .be hereinafter stated as the description of complished by spring means. Thus, when the spring means and the. magnetic force actually 30 the invention proceeds. The invention. therefore, comprises a carbon balance, the armature is held immovable andthe pile voltageregulator, including an armature-that resistance of the carbon pile remains constant. is held in operative: position by. a plurality of U However; when the magnetic force changes, due shaped springs. One end of each spring is- an to changes in the voltage, the armature is affected to be moved and thus vary the pressureon the ~ chored to. the armature, while the. other end carbon pile. bears against the magnetic pot. Instrumentalties Inasmuch as the magnetic force which is effec tive on the armaturevaries inversely‘ as the square of the distance across the gap between the arma ture and the core, it becomes necessary to provide spring means, the resistance of which will vary to a corresponding degree; to maintain the desired are also. associated. with the springs for main taining them and the armature in proper position balance between the spring force and thev mag netic force and leaveythe; regulating rangeundis turbed'. An important object of this invention is the provision, in a carbon pile. electric regulatorof the character aforesaid, of novel spring means: for with. respect to the-pot. , For a full and more complete understanding. of the invention, reference may be- had to the fol lowing. description and drawing, wherein: I. is aside View, partly-- in section and partly in elevation, of. those portions of a. carbon pile voltage regulator- with which this invention is concerned; Fig. 215 aplan viewof- the construction shown irrEig. 1.; and. Fig. 3.is- a. fragmentary showing similar. to Fig; this purpose. More in detail, the invention has as an. object 5-. l. of a modi?cation. the provision, in a carbon pile voltage- regulator, Referring now. to the drawing. wherein like reference characters. denote. corresponding parts, ofv an armature, a magnetic pot, and a. substan tially U-shaped. spring, one end of which is an and, ?rst more‘; particularly to Figs. I‘ and 2-, the carbon pileofr a carbon. piler voltage regulator is chored. to the armature.- and the; other end, of which engages thatop. of the pot. In‘ carrying 55 shown. at. H); While; the; invention is described aeoasie 4 It tor. as applied to a voltage regulator, it will be un derstood that it might just as well be applied to any electric regulator which embodies, as an es sential element, a variable resistance. Also, while the resistance which is varied is illustrated and described as a carbon pile, it could obviously take the form of a pile of discs of any material such as a metal having the properties which would suit it to this particular use. the magnetic pot P is counter-balanced by the springs 20, and the armature is held immovable to maintain constant the resistance of the pile ii]. As the voltage across the generator varies, there is a corresponding change in the coils of the solenoid S to effect a change in the magnetic force. The armature ll is moved by this change in the magnetic force, and thus the pressure on ' The pile Iii is made up of a plurality of car Normally, the magnetic force offered by l0 the carbon pile I0 is varied, which in turn varies bon discs in accordance with customary practice. The function of the regulator is to vary the pres sure on the pile iii. For this purpose an arma ture ll carries an abutting member 52 which en gages with, or is connected to, one end of the 15 the ?eld strength of the generator. Referring now more particularly to Fig. 3, where there is illustrated a modi?ed form of the pile H]. < which may be of the well known bimetal struc ture, is positioned on the top I4 of the magnetic - In the form of the invention illustrated in the drawing, the pile iii, armature H and mag invention in which provision is made for tem perature compensation, at thermostatic ring 22, pot about the opening ll. A washer 23 may engage the ring 22, and this netic pot about to be described, are illustrated as circular, although this is intended to be no limi 20 washer 23 carries U-shaped springs which are anchored to the armature i I in the manner above tation on the invention. Obviously, the circular described. It is evident that the conical forma formation could be deformed without departing tion of the bimetallic ring 22 provides for a from the spirit of the invention. A magnetic pot is referred to in its entirety by the reference character P and is shown as com change in the relative position of the armature 25 assembly coincident with variations in temper ature. While two embodiments of the invention are hereinbefore set forth, it is to be clearly under that the cylindrical wall i3 projects above the stood that the invention is not to be limited to top wall [4 a slight distance to provide a periph eral ?ange it. 30 the exact constructions illustrated and described, because various modi?cations of these details The top wall M is formed with the usual cen may be provided in putting the invention into tral Opening ll, and a cylindrical core 88 up practice within the purview of the appended stands from the bottom wall 15 and has its top claims. end located in the opening H’. A solenoid indi What is claimed is: cated at S is positioned in the pot P about the 35 1. In a carbon pile electric regulator including core I8. a carbon pile and a magnetic pot having a top The armature l i is held in position by a plural surrounded by a peripheral ?ange, an armature ity of spring assemblies, each of which is of sub assembly for regulating said carbon pile, com stantially the same construction as the other. Thus, only one of these spring assemblies is here 40 prising an armature, a base plate of circular shape positioned Within said peripheral flange in described for the purposes of this speci?cation. and adjacent said top and flange, a series of Each spring assembly comprises a base l9, from tongue portions formed integral with said plate which is struck a tongue or leaf Zil that is bent and projecting therefrom in a U-shaped forma up and over into U-shaped formation. The free extremity of each tongue 26! is anchored to the 45 tion, said U-shaped tongue ‘portions extending radially inward of said base plate and having the upper face of the armature H in any preferred free ends thereof fastened to said armature so manner, as by the screw fastening elements shown as to ?exibly support said armature‘ relative to at 2 i. said carbon pile and magnetic pot. It will be noted that the bases 20 conform in 2. In a carbon pile electric regulator including shape to the cylindrical formation of the pot 50 a carbon pile and a magnetic pot having a top P, and their outer peripheral edges engage the surrounded by a peripheral ?ange, an armature ?ange it. Thus, each spring assembly is posi assembly for regulating said carbon pile, com tioned and serves to maintain the armature H prising an armature, a base plate of circular in proper position. It is particularly important to note that the 55 shape positioned within said peripheral ?ange and adjacent said ?ange, a series of tongue por spring device thus described provides a conven tions formed integral with said plate and pro ient and novel means for mounting the armature jecting therefrom in a U-shaped formation, said which device is of such simplicity in construc U-shaped tongue portions extending radially in tion as to be readily adapted for manufacture and installation at low cost. 60 ward of said base plate and having the free ends prising a cylindrical wall I3, which carries a top wall it and a bottom wall i5. It will be noted In the operation of the device, the tongue spring thereof fastened to said armature so as to ?ex ibly support said armature relative to: said car bon pile and magnetic pot, and temperature re it approaches the top of the core E8, the mag sponsive means for adjustably positioning said netic force of the latter varies inversely as the square of the distance between the armature and 65 base plate with relation to the top of said mag netic pot. the top of the core. The resistance offered by 3. In a carbon pile electric regulator including the springs 20 must Vary commensurate with a carbon pile and a magnetic po-t having a top these changes in the magnetic force. The springs surrounded by a peripheral ?ange, an armature being of the cantilever type may be so designed as to have this property. 70 assembly for regulating said carbon pile, com prising an armature, a base plate of circular While the operation of the above-described shape positioned within said peripheral ?ange mechanism is believed to be obvious, it may be and adjacent said ?ange, a series of tongue por brie?y outlined by noting that the solenoid is tions formed integral with said plate and pro connected across the generator, while the carbon pile I0 is in series with the ?eld of the genera 75 jecting therefrom in a U-shaped formation, said members are so arranged that as the armature 2,405,514 5 U-shaped tongue portions projecting inwardly of said base plate, screw members for adjustably fastening the free ends of each of said tongue portions to said armature so as to ?exibly sup port said armature relative to said carbon pile and magnetic pot. tongue members formed integral with said base plate and projecting therefrom in a substantially U-shaped formation, each of said tongue mem bers having end portions positioned in spaced relation to said base plate and extending inward a carbon pile, a magnetic element, and an arma of said base plate, and means fastening each of the end portions of said tongue members to said armature so as to ?exibly support said arm ture assembly for regulating said carbon pile, ature in relation to said carbon pile and magnetic 4. In a carbon pile electric regulator including comprising an armature, a base plate carried at 1° element. one end of said magnetic element, a plurality of WILLIAM G. NEILD.