US1701386A - Resistance - Google Patents

Description

Feb. 5, 1929. 1,701,386;

G. J.- MUCHER RESISTANCE Filed Nov. 30, 1927 ATTORNEY Y 10' to va l5 ments are required.

' Patented Fel.l s 192e.

UNITED 'sT GEORGE J. MUCHER, OF TQY, NEW YOR RESISTANCE.

applicati@ mea november so, 1927. serial no. zas/,soi

This invention relates to resistances, and

has for an'object to provide an improved construction over my prior application, Serlal No. 134,042, wherein one' or a large number 5v of compression members may be arranged 1n `a single housing.

Another object of the invention is to pro- "vide a resistance which is very sensitive and accurate,'and which may be readilyadjusted l the action of the resistance element, where y the device may be used with current rectifying devices, telephone stabilizing devices, and also for other electrical uses where maximum eiliciency and balancing adjust- Y A still further object of the inventionis to provide. an improved resistance, wherein a multiple of resistance units are provided Y with independent adjustment for 'each umt. A still further object, more speciflcally,'1s `to provide a resistance unit wherein the .I eans for adjusting the compressing unit associated with a spring structure which maintains a constant' Contact, notwithstand- 25 ing -the varying pressures provided, or notwithstanding the reversing of movement of annof the members. the accompanying drawmg- Y Figure 1 is a longitudinal vertical sectional view through a resistance struct-urev 'disclos-A ing an embodiment of the invention. Figure 2 is a sectional view through Figure 1, approimately on. line 2-2. Y Figure 3 is a view similar toFigure 2 buty showing a large number of individual units in a single casing. j

Figure 4 is a plan view of a spring plate usedjn connection with the structure shown inriguresneanda 4e Referring to the. accompanying drawing by numerals, 1 indicates a casing, whichin the present instance, is` foimed of metal, but if desired, -terial or. other material, without departing 45" -froin the spirit'of, the invention. Where the casing'l is made from insulating material, he'compression screws 2 and 3 become terminalsinstead of the terminals 4 and 5. Thel terminals 4 and 5 are what may be termed, common returnterminals, so that one or more ure"1, these terminals fare in frictional enf gagem'ent with the oiset portions 6g and 7 L of casing 1.. Where the casin' 1 is lmetal, a

good. contact is not secured. n forming the-v v o'isets 6 and 7, corresponding depressions are could'be formed of insulating ma- I.

maybe used as desired. As indicated in Fig- I l I and 1 9. Also, if desired, the denslt'y of the formed interiorly of the .easing 1, and in these depressions insulating plates 8 and 9 are "provided, said' plates preferably filling the depressions.

Rivets or other metallic connectlng means 10 and 11 are provided,

. said rivets having comparatively large heads 12 and 13 so as to present an ample surface to the resistance bodies14 and 15. Arranged exteriorly ofthe lcontacts 4 and 5, are insu'-v latmg plates 16 and 17, and arranged exteriorly 4of these arethe individual'contacts 18 and 19.\ The rivets 10and 11 a'ct to clamptherespeetive contacts in place as shown in.

Figure 1, and also clamp the plates 8. and 9 in po'sition, whereby vthe heads 12 and 13 are automatically held in. the desired position,

while the bodies of the rivets are out of con-l tact with the depressed portions 6 and 7, as

'there'is a` large opening in these depressed.

portions. As the lates 8 and 9 Contact tightly with-the bo ies of the rivets'lO and 11, these rivets are held centrally of the respective'apertures in the depressed portions 6 and 7, thus theplates 8 and 9 act. in the double capacity ofv insulating means for in ysulating the heads 12 and 13 from the depressed portions 6 and 7, and as means for centering the rpins in the openings in the depressed portions. The depressed portions and plates .8 and 9 may be made of sired size, lbut preferably approximately the proportion shown in Figure 1 is the desirany -deable sizev so that current passing into thecasi ing lfwillhave to pass through an appreciable part of the resistance material 14 and 15 before it can vreach the enlargements 12 and 13.

The resistance material 14and 15 may be any Adesired kind of resistance material, as for instance, metal finely divided, carbon 'or other conducting material mixed with mica line-ly divided, or other material which will give. a resilient action to the body.

The structure in Figure. 1 is substantially-AA elliptical 'as illustrated in Figure 2, and is divided' by a wall 20 which may be metal or insulating lmaterial as clesired. Thislwall divides the'casing 1 into compartments or sections 21-and 2 2, the respective sections being identical. In"us'e preferably either of the terminals current is taken o both the terminals' 18 ladjusted to the demand of the individual in 4oi' 5- are used, but not both, while strument to which it is electrically connected. Arranged in each of the sections 21 and 22, 1s

a compressor 23. As the respective compressors and lassociated parts are identlcal, the description'of one will, a ply to both. `The compressor 23pis prefera ly formed with a 'central body 24 of felt or some other resilient y material, on the lower face of the body 24 is ap' tej25 of metal, while on the upper -face afsiliiillar plate 26 is placed. Plate 26,

however',fispreferably provided with pressed out tongues 27 which extend through the body 24 and plate'25 so as to be bent over or 'u set and act as rivets -for holding the two' p ates in position and in firm contact with the body 24. If desired, separate rivets could be used instead of tongues 27 or even bolts or other forms of clamping means. Plate 26 is provided with a raised portion 28 vwhich is 'formed with a narrow slot or opening 29 merglng into a large opening 30. The large e vopening- 30 is adapted to accommodate the 'head 31 connected with the neck 32 extending from the .clamping screw 2. The neck 32 is substantially the same length as the thickness of plate 26, though if desired, it may be made slightl longer. .In securing the parts together, t e screw member 2 is positioned so that the head 31 may be forced through the o ening 30 and then moved over until neck 321s fitting in theslot 29. If. the

parts areabsolutely accurate, head 31 or some I 1s inserted beneath the dating the three rivets 27 However, if four part of theI screw 2 will always remain in contact with the plate 26.'` However, quite often when manufacturing the devices,l the absolute accuracy desired is not secured, and to 4compensate for this, a spring'plate 33 (Figure 4j)- late 26 and pressed or embedded in the b y 24. The plate 33 isshown substantially trlangle, and provided with a notch 34 ineach corner for accommorivets are used, two notches 34 would be suiicient, whereasrif i the rivets 27 ,were

differently arranged the notches 34 would be larranged accor ingly. By using the notches 34, plate 33'is prevented from becoming displa''ged and, consequently, the

'bent up tongue 35",is always resilient] pressing against 'the fheti 31 .even ythong this ypart of the device may be loosely connected -with plate 26'. By reason of the tongue 35, a good' electrical contact iszalways maintained, as the s'cre'w 2'is forced inwardly` or outwardly. From Figure 1 it will be note-d that the screw 2. isthreaded through an internally and externally-threaded sleeve 36 I l whichis screwedinto a cover plate 3 7 formed with its edges litting tightly into the turned over bead 38 forming the upper edge of the casin 1.

In igure 3, a large number of independent sections 21 are provided, and all these sec tions maybe connected to a common return or sup ly, whileeach section has an individual out et. Imthis way, an one of the compression screws may be tig itened and the outlet from that section will be varied accordingly.

If there should be-six compartments or sections 21', the various compression screws vcould be adjusted sothat six different resistin units would be presented.

hat I claim is 1.4 In a resistance unit, a resistance body, a casing containing said body, a contact carried by said casing at one point, a com ressor carried by said body, said compressori) a large portion mergin into a restricted portion, threaded means or shifting said comressor backand forth, said threaded means eing provided with a head fitted between said plate and with a neck fitted-in said restrictedportion of said opening, said head being of a size to pass through said opening at 'said large portion and a spring plate arranged beneath said first mentioned plate with a resilient tongue continually pressing said head.

In a resistance unit, a compressor formed with la fibrous body and a metallic xaving a top plate formed with an opening havingl plate on each facel thereof, means for conplates together, said plates being of less.

diameter than said fibrous body, one of said plates having an opening for receiving an actuating member, and a Contact plate arranged beneaththe plate having the opening, said contact plate beiner continually in.4 contact with the plate llaviugthc opening and formed with u-ieans extending across said opening so as to contlnuallyenguge the actutuatmg member when the device is in use.

fand State of New York this 21 day of Nov.

GEORGE a., MUGHER.

Signed atf'lrov infvthe county of Rensselaer `4 msonAiMER 1,'701,386.--61'eo1'gc J. Macher, Troy, N. Y. REsIsTANoE. `Patent dated February 5, 1929. Disclaimer filed July 31, 193,0, by the patentee.

Hereby enters this disclaimer of claims 2 and 3 in said specification which is in the following Words, to Wit: v

2. ln a resistance unit, a compressor formed with afibrous body and a metallic` plate on each face thereof, means for connecting said plates together and an actuating-A member having one end rotatably connected with one of said plates, and a spring plate arranged beneath one of said plates and against said fibrous body, said spring plate having a portion. continually pressing against said actuating member. v

3. In`a resistance unit, a compressor comprising a fibrous body, a metal plate on each face of said body, means for connecting said plates together, said plates being of less diameter than said fibrous body, one of said plates having an opening for receiving an actuating member, and a contact plate arranged beneath the plate having the opening, said contact plate being continually in contact with the plate having the opening and formed with means extending across said opening so as to continually engage the actuating member when the device is in use.

[Qcz'cl Gazette August 26, 1930.]

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