US2594977A - Regulator - Google Patents

Description

April 1952 w. G. NEILD 2,594,977

REGULATOR Original Filed April 1, 1948 2 SHEETS-SHEET 1 Til/l IN VEN TOR.

zu/LLmm 5. NE/LD HWKNEV W. G. NEILD April 29, 1952 REGULATOR 2 SHEETS-SHEET 2 G-riginal Filed April 1, 1948 fir DR E V Patented Apr. 29, 1952 PATENT overc 12 IREGULATOR willia mnGeeNcilfli..Fairlawn, N.. J., ass ignor to giBendixlAviationCorpol-ation,Teterboro,?'N.-'J., a corporation 'of Delaware filfiginalmnplication Ap i 119. 8 vSe ia .-:-No.

. This application ,is division. of application Patent 2,533,038 and relates to improvementsin a carbon pile regulatoraofithe.,type disclosed' in the copending i U., S....apDlicatiI1. Serial 'No. 684,3 filed Ju .1.Q46;.by Wi11iami;G.:;Nei1d. now U. S. Patent 2,506,234.

An, object of the, invention.,.is .1 .to, provide an improved housing for a regulator; including, a

novel arrangement forshieldinga voltage calibrating device, while .permitting the ready adjustment thereof.

Another object; .of the invention is to, provide a novel and compact arran ement i0 1. a carbon pile regulator in which. all adjustable partshare enclosed to prevent... tampering by, i unauthorized personnel.

.8433. ;.,:Di,videdand this;application. ,0ctober i113 :.Q49s Serial .No- 121,115

Figure 2 is a fragmentaryview of the armature spring and mounting arrangement.

Figure 3,.is. a fragmentary viewlof a, modified form of thespring arrangement.

Figure 4 is anendview of...the regulator housing showingthe novel volta e .adiustme t and voltmeter test ,jacks provided therein.

Referring. to. ;the, drawing;v of Figure acarbon pile is illustratedratrlfl and comprises a-number of hollow discs oi carbon .whlchare stacked within atube ll. The. tube,||.- is preferably formed of a suitable. ceramicelectricalinsulating material to carry away. the heat-developed-by. the carbon pile l0. .Theucarbonpile l0,is of, a,suit able size and length to developgthe desired,reg-

,. ulating characteristics. Thetube l Lis 7 received within a metal shell; I 2.;and; in;Q1tder.toiacililla the dissipation of the heat,'the shellgjs prefer- .ably provided with fins .I3 ,.over., its length so as to more readily,jdissipatelthev heat-awayjirom the pileand increase thecapa'city,01:v the pile. Contact elements l4 and; 15. are adiustably mounted within. the tube l .l; at the, .opposite ends of the carbon pile 1B. 'Ifhe contact element I4 :2 Affixedat one end" to 'the contact element-|5 is a' tubular ,member -Q 0* formed of"; a material such as copper havinga relatively' high temperature coefficient of expansion. "The tubular member projects interiorlywithin-the hollow carbon discs I ll and has; secured-to its othenend The plate is fastened to the-shell 1 I 2 by bolts '32 which are suitably -insula-ted'-by-memj beri34 from the;plate 30. The plate 30 -is'also insulated from Y the shell l2 by 2. suitable insulatingstrip 36.

Through the latter arrangement. *iirwill-be-seen that upon 'an- :increase? in temperature tending to cause the pile 10 to lengthen, I the -tube-'-: 20 20" having a hightemperature coefli'cient-of'egcpansionwill also tend-*tofilengthen relative to' the rod24 causing the-contact element 15to-move toward the right soaasto -compensate=-iorthe lengtheningof; the pile duetosuchrise in temperature.

A decrease in temperature -wi-ll=-have -the=oppositeefiect onthe tube "211 so that-the*tube-.will tend to move the contact element 15 toward the left to compensate for the temperature efi'ect on jecting interiorlyWithin-the hollow carbon-discs l0,'the same will be directlyresponsiveto the temperature of the carbon pile 10' so as to-more accurately compensate *for variations inthe length of the pile due to change-in temperature.

At the opposite endof the carbon pile 10, the contact element [4- isregulated by. action 'ofiithe armaturel8 solas to vary the compressive force applied on the'carbon pile l0 and accordingly the resistance thereof. 'Thearmatureelflrali i spring assembly therefore; may; be .ofha type; disclosed and claimed in the.;,copen ding application;- serial No. 684,379,; filed :July 1 7,; 1946 qby zwilliam G.

' Neild, now U. S. Patent 2,506,234.

'AS show ieu1'e'. :the armature lilincludes 1 a flexible metalhinge 38 which has. one end riveted v to the armature I8,-. and. the, .othenend fastened by bolt 40 and-bar to. oneend of a U-shaped supporting.. member .Mhavin legs which extendat opposite sides, of ane lectromagnet 46. The electromagnetjfiiis,iaStened -by bolts. 48- to ,a supporting plate .49. Theubolts 48 also serveto securethe U- -sh aped member to the ..p1ate 14 9. v Screw .ithreajdedlmenea edgjnzithe plate 49 is an adjustable electromagnetic core 50, which projects through the electromagnet 46 into operating spaced relation to the armature I8. The plate 49 is fastened to the shell I2 by rods 52, as shown in Figure 1.

While one end of the armature I8 is flexibly connected by the hinge member 38, the opposite end of the armature I8 is operatively connected to a spring mechanism indicated generally by the numeral 54 and shown in Figures 1 and 2.

The aforenoted mechanism includes a ball bearing 56 which rides at one side in a seat 58 carried by the armature I8, while the opposite side of the ball bearing rides in a seat 60 formed in an adjustable member 62. The member 62 has projecting therefrom a stem portion 64 having screw threads which engage in corresponding internal threads formed in a member 68. A look. nut serves to fasten the screw 62 in adjusted position relative to the member 68. The member 68, as best shown in Figure 2, extends at a ninety degree angle to the plate 49. One side of the member 68 is fastened by bolts I2 to one end of a curved metal spring blade I5. The other end of the spring blade I5 is fastened to the supporting plate 49 by bolts I8. At the opposite side of the member 68, there is fastened by nut I3 of bolt I2 one end of a similar curved metal spring blade "I5. The opposite end of the latter curved metal spring blade is similarly fastened to the supporting member 49 by like bolts indicated by the numeral it. In operation it will be seen that upon a force being applied at the armature I8 by the electromagnet 46, the spring blades 15 will. tend to wrap or roll on the surface of the vertical member 08 and the horizontal member 49 as the armature I8 moves under the force of electromagnet 46. Such action will decrease the radiusof the spring 75 and greatly increase its resistance to force, so as to provide a force deflection curve which very closely resembles an inverse square curve and effect a rolling non-slipping action with a minimum friction.

The latter force deflection curve will closely approximate that of the electromagnet 48 which; will apply a force to the armature I8 which continuously increases in excess of a linear relation. as the armature I8 approaches the electromagnet 46 and which force will vary approximately" inversely as the square of the distance between;

the armature and magnet. Thus, the opposing armature spring T5 is arranged to compensate for the varying force applied by the electromagnet to the armature I8. Basic correspondence between the force of the spring "I5 and the electro-- magnet 46 may be conveniently affected by ad-- justing the member 62 of the spring mechanism. 54 and the core of the magnet 46 so that the.- force of the one matches that of the other.

A modified form of the spring arrangement is shown in Figure 3 in which corresponding numerals indicate like parts to those described in Figure 2.

In the arrangement of Figure 3, the member 08 is split at TI to provide leg portions I8 and I9 which have an inherent spring tension tending to bias the legs l8 and I9 inward. A wedge-like screw is screw threadedly engaged in the split portion I! of the member 68 for adjusting the leg' 9 portions 18 and I8 relative to the spring blades 15. The screw 80 has a cleft portion 82 readily accessible through an opening 84 in the plate. 49 so that the screw 80 may be readily manually terminal board, not shown,

4 adjusted by means of a screw driver or other suitable tool.

The adjustment of the leg portions I8 and I9 relative to the spring blades I5 permits the force characteristic of the spring blades l5 to be varied so that the force deflection curve of the springs I5 may be matched more closely with the force of the electromagnet 46.

A further feature of the invention resides in the provision of a leaf spring 85 fastened at opposite ends to the shell I2, as shown in Figure 2. Connected to the leaf spring 85 intermediate its opposite ends is the button IS. The leaf spring 85 biases the floating contact element I4 which is loosely positioned in tube II towards the armature I8. The armature I8 is spring hinged at 38 and biased by the spring mechanism 54 in a clockwise direction. The leaf spring 85 serves to keep the pile I8 together in the event the whole armature end should be removed and also centers the button I6 in relation to the member I! of the armature is without hand-fitting or complicated linkage.

A cover cap 80, shown in Figure 1, fits lightly about one end of the shell I2 and surrounds the armature spring assembly so as to protect the same from dust and possible injury. The cover cap 80 is fastened in position by a suitable screw 81.

At the opposite end of the shell I2 there is provided a bracket 96, as shown in Figure l, fastened to the shell I2 by a nut 92 screw threadedly engaged on rod 52. Mounted in the bracket are jacks or electrical connectors 93 and an adjustable resistor 94 having a rotatable arm not shown which may be adjustably positioned on a resistor 98 by adjustment of a rotatable slotted head member I00. The variable resistor 94 has the variable resistance element 98 connected in series with the electromagnetic coil 46 so as to set the value of the electrical condition or voltage for which the coil 46 is to regulate. The jacks 93 are suitably connected across the regulated condition or voltage so that a voltmeter or other measuring instrument may be connected into the circuit through the jacks for testing purposes. A cover cap I92 is fastened to the bracket 90 by bolt I04. The cover cap I02 fits tightly about the latter end of the shell I2 and protects the calibrating resistor 94 from dust and possible damage. Suitable openings are formed in the end of the cover cap I02 so as to permit the ends of the jacks 93 and the slotted head I00 of the adjustable resistor 94 to project therethrough.

This arrangement, which permits only head I00 to be exposed, is safe both electrically and mechanically. In former units where the resistor 94 was externally located there was provided fire hazards from hot wiring.

The entire regulator assembly may be conveniently mounted on a base plate I05 which in turn is supported by suitable shock mounts indicated generally by the numeral I I0, as shown in Figure 4.

Suitable electrical conductors, not shown, lead from one end of the carbon pile I0, while another suitable electrical conductor leads from the other end of the carbon pile I0. These electrical conductors lead in turn to an insulated which may be mounted in the base plate I05 so that the carbon pile may be conveniently connected into the regulating circuit as is well known in the art. Electrical conductors also lead from the terminal board to the electromagnet 46 through the calibrating resistor 94 so that the same may be responsive to the regulated condition or voltage.

In the operation of the spring mechanism 54, in the arrangement shown in Figures 1 and 2, it will be seen that as the armature i8 is drawn towards the electromagnetic core 50, the spring plates 75 will roll or wrap along the member 68 and in toward the center on the horizontal member 49 and thereby decrease the radius of the curve and increase the resistance of the spring 15 to the magnet force so as to efiect basic correspondence with the nonlinear force characteristic of the electromagnet 46.

Through the arrangement of the ball bearing 56 the element 62 may be conveniently rotated so as to vary the tension of the springs 15 and thereby match the deflection curve of the spring '15 with that of the electromagnet 46. Through the adjustment screw 82 of Figure 3 the characteristic of the spring [5 may be varied so as to more accurately balance or match the electromagnet 46.

It will be further seen that upon changes in temperature tending to vary the length of the pile H], the adjustment of the contact element l5 through the coaction of the tube and rod 24 will readily compensate for such changes in temperature.

Although only one embodiment of the invention has been illustrated and described, various changes in the form and relative arrangements of the parts may be made to suit requirements.

What is claimed is:

1. In an electrical regulator of the type including a variable resistance means, a housing for said means, an electromagnet, an armature movably mounted in relation to said electromagnet, means operatively connecting the armature to the variable electrical resistance means; the improvement comprising a bracket carried by said housing, a calibrating resistor for varying the setting of said electromagnet, said calibrating resistor supported by said bracket, an adjustable member for varying said calibrating resistor, a cover cap fastened to said bracket and enclosing said calibrating resistor and bracket so as to shield said adjustable member from accidental displacement, said cover cap fitting tightly about one end of the housing and having an opening formed therein, and said adjustable member having a cleft portion accessible for manual adjustment through said opening in the cover cap.

2. The combination defined by claim 1 including a pair of connector jacks carried by said bracket and shielded by said cover cap, said cover cap having other openings formed therein for access to said jacks, and said jacks connected to the input to said electromagnet so that adjustment of the setting of said electromagnet by said calibrating resistor may be readily tested through said jacks without the removal of said cover cap;

3. In an electrical regulator of the type including a variable resistance means, a housing for said means, an electromagnet, an armature movably mounted in relation to said electromagnet, means operatively connecting the armature to the variable electrical resistance means, the improvement comprising a bracket, means for securing said bracket to said housing, a variable resistor for selectively adjusting said electromagnet, means including said bracket for mounting said resistor, an adjustable member for varying said resistor, a substantially cup-shaped cover adapted to coact with said housing to enclose said bracket and said resistor, said cover having an opening formed therein, said adjustable member having a slotted portion positioned for accessibility for manual adjustment through said opening in said cover.

4. The combination defined by claim 3 including a plurality of test jacks supported by said bracket and enclosed by said cover, said cover having other openings formed therein, said last openings and said jacks being so positioned re1- ative to each other to provide access to said jacks, said jacks being connected to said electromagnet so that electrical condition of said electromagnet may be readily tested through said jacks without the removal of said cover.

WILLIAM G. NEILD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,938,396 Megow Dec. 5, 1933 2,036,488 Moore Apr. 7, 1936 2,076,912 Moore Apr. 13, 1937 2,307,612 Westendorp Jan. 5, 1943 2,408,478 Petty Oct. 1, 1946 2,418,687 Arnesen -1 Apr. 8, 1947

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