US1643105A

US1643105A - Mer mfg

Info

Publication number: US1643105A
Authority: US
Publication date: 1927-09-20
Anticipated expiration: 1944-09-20

Description

sept. 2o, 1927. 1,643,105A

H. J. WIEGAND RESISTANCE CONTROL APPARATUS Filed June 4, 1923 u'yi.

ATTORNEY Patented Sept. 20, 1927.

UNITED :STATES PATENT OFFHCE.

HENRY J; WIEG-AND, 'OF'MILNAUKEIl WISCONSIN, ASSIGNOR TO THE CUTLERHAM- MER MFG'. CO.: OF MILWAUKEE. WSCONSIN, A CORPORATION OF WISCONSIN.

RESISTANCE CONTROL APPARATUS.

VApplication filed June 4,

This invention relatesto resistance control appara-tus, and while not limited thereto is particularly applicable to apparatus for voltage control ofaudion valves and the As is well known-the design andv construction of such valves has been and at present is in a stateof rapid development and improvement, snchzchanges frequently n' involving correspondingchanges in thecharacter and values of theenergy supplied to theyalvesand in the rangefofvariation of such values required .in service. As a -result of the..foregqng certain hivhlymeritol rioustypesand constructions o control devicslor-i such. valves end f-alsc large quanti- 'ties of existingapparatns. are in danger of obsolescence 1nnlesssv orrespndingly devel- Opedf-mdfend impreved- I" ,Anobjeet offthe .present invention is that of` adapti` x1g;such potentiallyjobsolete designs and-: apparatus to .ipresentIA and prospective needs),-

Anoth 11 ob'ectisltliatipfm .prolonging i5 and extend-ing tlie'utility iof such designs and such apparatus witliout substantialfintninsic modification thereof and ,with a minimum of addition thereto..

Another obfjec 3" 'and-amplifying Such existiagiypesof-apparatus, to' z idaptl the; saine .t o presentand pros- -Peciv#slee-51S@mdI also reducing? the-Dumber 0f elsfilntssendspae .requirements-whom centrating andggsimplifying :the: control Other objects andadyantageswill herein.- aftsrappear.. im 1 1 In the 'accompanying drawing. wherein are illustrated certain. prefer red embodiments of the ,invention` i.

'Figure 1 isa side elevational view of such f -ElgffZfisarear.e1evational view of one of the portions thereof While.,A "1

.fgFig. BfisEa-perspective vievv of-fa,

modfiedronstructen..

Referring to thedrawino'y and particularly toFigs. 1 anfd-.2t-thereofft esame illustrate associatedl individually operable .resistance control deviceshavingsupporting elements in common andfcom}iris ing a pluralityof U-shapedframef members. 5 land 6,-preferably composed'of metal, to be' secured to a common connecting memberl 7, preferably conductive and of channeled formation as 1923. Serial N0. 643,328.

.shown7 by bolts or screws 8 and- 9 and to be permanently secured upon an insulating base or panel 10. Frame members 5 and 6 are adapted to support the

variable resistance devices

11 and 12 each having suitable terminals and operating means therefor, the latter preferably including

concentric shafts

13 and 14 penetrating thecontrolpanel 10 and provided on the oppositeside thereof with individual operating .means such as

knobs

16 and 15. Indicators such as 17 may be fixed to oneor both of. said shafts for indicating the setting of the individual elements operable thereby.

Obviously the longitudinal llangesbf the connector 7 are-adapted to coact^ d;ir'ectly with the adjacent edge portions of; .frame members 5 and 6 for maintaining a-coplanar relation of the operatingzshaftsl and 14 whereas said connector iS .,'OthelNYise' vso shaped, as shoivn,. to provide .not only for actual parallelism of said shaftsvbutfurther to provide and maintain a concentric or telescopic lrelation thereof,.thus again providing for longitudinal adjustment of Asaid shafts and preventing operative interference thereof.4

The resistance devices 11 and: 12 comprise generally, resistor coilsllt and 19 mounted respectively upon rotatable members'Q and 21, the rotatable members 2 05inc1uding a Circumferentially grooved annular' insulating member; to receive and-,'hold the resistor coil 18 in spaced relation .with respectto the metallic end capsof the member 20; whercasthe rotatable member 2li-.comprises a-pair of insulatingdisks havingnpon their adjacent faces and adjacenttthe .'respective peripheries thereof inwardly Afacing..annular grooves to receive the l(resistor-.element 19 the latter comprisinga. relatively large number of. turns Ofiline resistancejvire .wound .upon a flexible strip-of fibre or other suitable insulating' material. Each of said coilshas llO Details of said resistance devicesare disclosed and claimed in my copending-applications, S. N. 561,136, tiled May 15, 1922 3nd S. N. 622,078 tiled March l, 1923, and

'. hence further description herein of these elemanner Whereas the element 1l is also Se cured to the concentric shaft 22 and such securement of said element may be conveniently cll'ected b v means of the usual set screw 23 acting through and upon hub portion 24 and also penetrating a suitable opening in tubular shaft and producing a clamping action on said shaft 13.

An auxiliary resistance element 25 of suitable or desired ohmic value is secured to the resistance device to be in circuit therewith. In practice said resistance element 25 may preferably comprise' a coil 26 of a relatively` large number of turns of resistance Wire 2. said wire being preferably Wound upon a liexible strip 28 of fibre or other suitable insulating material and terminally anchored thereto,- one end of said resistance wire being so anchored preferably by means of annet-al grommet 29 said grommet serving as a mounting means for one end of the resistance element while theopposite end is rovided with an aperture 30. In 'mounting said resistance element 25, as shown in Fig. 1, the end having the grommet therein is secured to and upon the terminal device 31 and said strip- 28 having the resistance element 25 coiled vthereon is thereafter bent or bowed to bring the aperture 30 into register 'with b'olt S and`is thereafter secured by'nut 32;

In Fig. 2 is shown a modified form of mounting means for one end of the a-uxil# iar'y resistance element 25, the-same comprisingaplate member 33 provided with a screw threaded opening 34 for the reception ot` Screw 35 and having a. projection 36 loosely 'connecting plate member 33 to flexible strip 28l thereby providing,lr limited movement of said plate member 33, the same actin: as a nutfor mount-ingr the endof the resistor element- 25 to frame member 5 as before described."This method facilitates mounting o'f the auxiliary resistance element,v it being readily seen' that such operation-may he accomplished Wholly from Without the frame` without involving disassembly of any part of the device.

The value of the resistance of the element 25 to be included in circuit may be varied by means of a slider 37 having one lead of the controlled circuit connected thereto. Said slider in practice may preferably comprise a metal strip -formed as best shown in Fig. 3. havingr portions 38 bent as shown not only to support the same but also to make contact with the resistance 27. A clamping screw 39 is provided lin the outstruck portion 40, said screw 39 being provided with a nut 4l for locking the slider in the desired position and also with a terminal device 42. The resistance element is to be in circuit with element 11 and such joint circuit may be traced from the terminal device of slider 37, through that portion of the resistance 26 determined by the positioning of said slider to terminal device 31 by Contact finger 43 to and through resistance 18 or through the portion thereof determined by the rheostat setting and't-henc'e to frame 5 and its associated terminal.

Referring now to Fig. 3,- th'e same illustrates a pair of main resistance varying elements similar to the eleme'nt 11, arranged, connected and supported for independent operation in the manner' afrede's'cribed.

One or both of said main resistance ele'- ments is in this instance provided with an auxiliary resistance element 25a `which is functionally siniil'ar'-to tlie' corres; ending' `element 25 aforedescribed but willich' is modified in matters of structure, dimensions, ctc., better to adapt the same' to certain special requirements` and conditions.

In this arrangement the rheostat terminal device 44 alone is adapted to prvide both for mechanical support and electrical connection of the"ele`1'nent 25; iyh'erby, the angular position of said element with rference to the rlieo'stat frame may 'bevaried at will to suit the conditions of any particular installation.

It is of course to be' understood that the

auxiliary resistance elements

25 and 25* may be substituted n for lthe 'otlierjand that either mayv berep'lac'eda mechanically similar unit having e diffrent olimic or other electricalvalue "vvlienyernecs's'igy or desirable in' o'rd'er to dapt the device, either electrically ordnecli-iiicallytoa particular installation. Also it is Vto be observdthat in accordance v'vitli the pi-snttacliiniipractically any desired number of independently operable; resistance orpotential controlling devices4 :or both may be arrg'd'fftioint electrical connection and mechanica] supi Port. i Again` optionally'- as shoivn inFig". '3, Sima 13' may be censfmcfdfofiasuiaung material as indicated at 13 and franie'nl'ay be insulated' from con'r'iector-'7a 'as tin insulating bushing 45, whereby the individual resistance varying deic'es may be"a"dapted to control electricallyindependnt circuits. Thus if desired all tlie resistance and poten- .ial control instrumentalities of a co'tnplet'e installation may be arranged Within vap-l proximately the same mounting area ordinarily occupied by a single instrumentality.

What. l claim as new and desire to secure by Letters Patent is liu ` for zsuiistninniy l., In resistance. control apparatus, the combination with aself sup ort-ingrheostat to'be secured to a base, o an attachment augmenting the total ohmic :value ofsaid rvheostlt, comprising an auxiliary flexible resistor devieeand ter- 'gmlnal means. providing' i ffonarcuate positioningiof the latter aboutsaid rheostat and 1 11 circuit with -the.- resistor :element thereofA 2.3In.resistance.@ntrol.apparatus, the

cemhnation; Withnef rheostat v having associated supporting means, of an attachment .for substant-ially augmenting A the. total ohm iq-valueof-sa'id rheostat comprising an. aux

iliaryzaierble:fresistpriidevce having tef- 2" .auxilianynresistereabout said rheostatand latedisgpporting means, of an -attachn'ient Asubstant1g,l ly;y -;augmenting the total fphx'nicj value pf .saidwrlieostan `comp rising an auxiliary flexible resisfordevice' having ter- .-minalmeans including ayrigidlysecured ter- .minal devichavlngparts'ito cooperate directly.with isad; nheostat, 1 supporting means ,-to uprovide; fox: 'a arcuate; positioning Aof said .aiuxl-liany-re'sistorabout said 'rheostat and for ,terminal-f connection .thereof in ci rcui t with 'saidIrheostag saidjauxiliary resistor Ehavingnneans .fompreselectng the effective 1olunic;value-thereof., i; g5 -4 v .resistance 'control: apparatus, the combination? with;.-.a'rheostat having. asso- -icia-tedfs'upportingvmeans, of an attachment for substantially augmenting the total ohmic value of'said-rheosta-t, comprising an auxiliary Hexible" resistor device having terninal means including an adjust-ably fixed slidenand a terminal device rigidly secured thereto for mechanical support and arcuatepositioningr Tof'said gauxiliary resistor about and in circuit 'with said rheostat.

5. In resistance control apparatus.l the combination with a rheostat having associated supportingr means, of an attachment for substantially augmenting the total ohmic value of said rheostat, comprising an auxiliary fiexible resistor device having terminal means including an adjustably fixed clamping slider and a rigidly secured terminal device for mechanical support and securement of said auxiliary resistor to and in circuit with said rheostat, in a relation providing for angular adjustment of the position of said auxiliary resistor with respect to the associated supporting means of said rheostat.

6. ln resistance control apparatus, the combination with a plurality of resistance varying devices having individual operating means and individual conductivesupporting frames to lie included in the controlled circuit` said frames having similarlyudisposed openings.` of an elongatedconnector to be terminally` secured to said framesadjacent to and in association with saidopenings for rigidly uniting and electrically .con-

Vnecting said devices, certain of thezflatter having means for ,securing .the samexupon -a4 base to .thereby provide 4 for eommongsupportl of all thedevices .so united theretosfg 7; In resistance control apparatus,' .the combina tion with .a plurality off-.resistance varying devices having individual operating means and individual conduetivesupporting framesto he included in thegcontrlledircuit, said frames having -similarlygdisposed openings, of van elongated xconductive :bon-

nectorA a1id.mea.ns to co-operateqwithifsaid :51

openings for rigidly unitingtandfeleetnicalnector, certain of4 said devices :ha-Ying' means .for securing the'same uponga basegtothereby provide ioi common-support.of.iallfthe devices so united. said operating. means-.be-

inf- T arranged and correlatedio'prowidea for close juxtaposition of the individualoperating members while maintainmglndependence of action thereof. 1; u igui 8. In yresistance coutrolappajratus,Ahe

combination with a plurality .of-resistance varying devices. having independentasapporting frames and individual (operating means: of a rigid har and meansfor-sec'uring said frames thereto .for mechanically uniting said devicesin a relation providing for close. juxtaposition ot certaino stlxeii' respective operati ng elements, said-bar having its longitudinal edges shaped to co-operate with adjacent portions of Vthe'respective frames for maintaining parallelism of said juxtaposed operating elements to thereb v minimize operative interference therebetween.

9. ln resistance control apparatus, the combination with a plurality of resistance varying devices having independent s'up-i porting frames and individual operating means, of a rigid metallic har and means for securing said frames thereto for electrically connecting and mechanically uniting said devices in a relation providing for close juxtaposition of certain of their respective operating elements said bar being shaped to co-operate with adjacent portions of said individual frames for maintaining a relation of said juxtaposed operating elements wherein operative interference therebetween is minimized` 10. In resistance control apparatus, the combination with a plurality of resistance ,loo

varying devices having independentconduc-v electrically connecting the latter` each of said supports having a portion extending in parallel relation to a given axis of its assoeiated resistance con-trol device, said means oomprisin" parts to coot with said parallel extending portions of said 'supports for maintaining -a coplanaarrangement of said axes, certain of said supports having means to provide -for mounting upon a common base of all the devices so united.

12. In resistance control apparatus, the combination with a plurality ofv resistance Varying devices having independent sup ports, of means to coact with the supports of said devices for mechanically uniting and electrically connecting' the latter. each of said supports having edge portions extending in parallel relation to a given axis of its associated resistance control device, said means comprising parallel edge portions to coact fwth the aforementioned edge portions of said supports for maintaining coplanar relation of said axes and said means being so formed as to maintain said axes Within a common plane angularly related to said former plane, certain of said supports having' means to provide for mounting upon a common base of all the devices so united.

13.|In resistance control apparatus', the combination with a plurality of resistance varying devices having independent supports, and correspondingly disposed operating shafts, of means to coact with the supports of said devices for mechanically uniting and electrically connecting the latter,

each of said supports having edge portions extending in parallel relation to the respective operating shaft of its associated resistance control device, said means comprising parallel edge portions to coact with the aforementioned edge portions of said sup'- ports for maintaining coplanar relation of said operating shafts and said means being further 'so formed as to provide foi` maintaining telescopic relation of said shafts to thereby provide for relativev airial adjustment thereof.

14. In resistance control apparatus, the combination with a plurality of resistance varying devices having independent substantially U-shaped metallic supports, of moans; to coaot with the supports of said devices for ymechanioally uniting the latter, each of said supports having edge portions eil-tending in parallel relation te the eperat- 'ing 'shaft of its associated resistance control device, said means comprising parallel edge .portions to ooaot with the aforementioned edge portions of said supports -for niaintaining parallel relation of said axes, certain of said supports having means to'prvide for mounting upon a common base of all the devices so united.

' l5. 'In resista-nce control apparatus, the combination with 'a i'rhe'ostatt having associated supporting means. of an attachment for substantially augmenting the total ohmic value of sziid rhe'ostat comprising an uXilliary resistor device having terminal means including a rigidly secured terminal device having parts to cooperate directly with said rheostat supporting means to provide both mechanica-l support and terminal connection of said auxiliary resistor device in circuit with said rheos'tat, said resistor device being of flexible construction to provide for arcu ate positioning thereof with respect to said supporting means and in radially spaced relation to said rheostat.

In Witness whereof, I have hereunto subscribed my name.

HENRY J. VVIEGAND.