US2153152A - Resistance - Google Patents

Description

April 4, 1939- G. J. MUCHER 2,153,152

- 'v RESISTANCE x Filed May 29. 195'/ ZZ i v Z4 l. I 13 24 f i i .llll

Illlll'llll`l Bew/je J. Mur/1er hun., Kama, w-"DrmoSC ATTORN EY Patented Apr. 4, 1939 PATENT oFFlcE RESISTANCE vGeorge J. Mucher, Brooklyn, N. Y., assigner tor Clarostat Manufacturing Co. Inc., Brooklyn, N. Y., a corporation of New York Application May 29, 1937, Serial No. 145,410

4 Claims.

i This invention relates to a structurally and functionally improved resistance capable of use y in numerous different associations, but primarily intended to be employed in radio 'receiving and 5 transmitting apparatus.

It is an object of the invention to furnish a resistance which will be of extremely compact and rugged character, such resistance being so supported that it is capable of being connected .u into or disconnected from a circuit.

A further object of the invention is that of providing a resistance which `rwill not become overheated and in which, under no circumstances, will the terminals be detrimentally laffected by 5 heat.

Another object is that of providing a unitary resistance including any number of desired values.

An additional object is that 'of providing units of this character which may readily be manul factured largely by ordinary machines and methods yand also by unskilled labor so that 'an extremely satisfactory device having a long period of effective use may be produced at nominal cost. With these and other objects in mind, reference i is had to the attached sheet of drawing illustrating one practical embodiment of the invention, and in which:

Fig. 1 is a sectional side view-of the resistance showing the same in partly assembled condition;

l0 Fig. 2 is a transverse sectional view taken through Fig. 1, but' showing the parts in completely assembled condition;

Fig. 3 is a bottom plan view of the base of the unit;

l5 Fig. 4 is a side Velevation of the unit, showing certain of the parts broken away to disclose underlying construction;

Fig. 5 is an enlarged view'of a fragment of the resistance mounting element, and

lo Fig. 6 is a transverse sectional view taken along the line I-S and in the direction of: the arrows of Fig. 5. y

In these views the numeral I0 indicates a base which is preferably in the form of a standard lamp base from which extends a centering plug II and an annular series of hollow terminal' The plug II may have extending members I2. from its face a positioning rib or iin I3 which,

in accordance with well known practice cooperates with the slot or notch in the socket receiving the base in order to properly position the parts.

A shell I4- of metal or other heat dissipating material is securedto the base preferably by having the latter notched and undercut at a plurality of points indicated at I6 and slitting (C1. zul-67) J.

the lower edge of case I4 to provide a plurality.

of locking tongues I6 extendable into these notches as best shown in Figs. 2 and 3. Extending above the central portion of base I0 is a support I1 preferably comprising a thin 5 body of mica or similar material. 'I'he mounting of this body'is conveniently effected by having vthe same perforated adjacent its lower and outer is formed with notches 20. It is to be observed that in its upper edge the sheet Il presents adjacent its side edges extended portions 2l which preferably project beyond the plane normally 2 occupied by the inner end surface of the tube or shell I5 when the latter is completely mounted` upon the base. Moreover, sheet Il may be formed with openings 22 and a resistance wire 23 extends from end to end of the sheet and is 25 maintained against displacement by resting within the notches.

The ends of this Wire are coupled to the pins I9 which provide the mounting for sheet Il and at this time it is to be noted that the resistance a0' may be tapped at any number of desired points. One of these has been indicated in Figs. 1 and 2, it being noted that a pin 24 is coupled to the wire at this point, preferably by employing an eyelet such as I8 which extends through one of 85 the openings'22, through which opening also wire 23 is passed. This wire additionally may be extended through the adjacent notch 20 so thatthe possibility of dislodgment is reduced to an utter minimum. Pin 24, as best shown in Fig. 2, is extended outwardly and downwardly into one of the terminal elements I2 in the manner previously described in connection with pin I 9.

Thus, in this resistance three resistance values are present, to wit: (a) from the terminal in which one pin I9 is disposed to the terminal in which the second pin Isis arranged, (b) from the left hand terminal I9 to the terminal with which pin 24 is associated, and (c) from the 50 terminal with which the right hand pin I! (as viewed in Fig. 1) is associated to the terminal within which pin 24 is disposed. It is, of course, to be appreciated that the resistance might be tapped at any number or additional points, but

this has not been shown with a view to avoiding undue complication of the illustration.

It is apparent that air may circulate within the tube or shell Il, around the ends of sheet I1. It may, moreover, circulate through openings 22, and in view of the heat dissipating character of tube Il, the temperatures will be always malntained weil below any point at which damage mightoccur. As afore brought out, sheet I1 is firmly mounted by the pins which are attached thereto and incident to the fact that the width' of this sheet is preferably equivalent to the diameter of the tube, no relative sidewise movement of the parts may occur. Moreover, as atore mentioned the portions 2| divide into such a plane that the tube, when fully mounted, will engage the upper edges of the same. This has a tendency to spread these upper edges as better indicated in Figs. 2 and 4, thus locking the sheet against further movement. The pins I9, 24, will of course be immovably secured with respect to the terminals within which they are disposed by utilizing solder, compressing these terminals, or otherwise.

Thus, an extremely unitary structure is presented and one in which lthe terminals are well below the source of heat. Consequently an accidental detachment of these terminals due to this cause is precluded. Moreover, being normally mounted in a vertical plane, there is little if any likelihood of the resistance coils breaking, even if the parts are subjected to a violent jarring action. However, to still further preclude the possibility of breaking, it will be observed, as in Figs. 5 and 6, that the surface of sheet i1 is preierably coated with a layer of cement, varnish, or other suitable material as indicated at 25, and coils 23 are applied while this material is still in a plastic or tacky condition. Consequent" ly, each individual convolution of the coils will be somewhat embedded in the layer, thus an."- choring the same against movement. Addition-n ally, this layer will key through the openings 2i around the edges of notches 20, etc., and will serve as an envelope for sheet l'l, preventing any deterioration thereof even under extreme conf ditions. This is especially desirable if the sheet is formed of mica in that substantially no disintegration or bulging of the parts will occur.

Thus, among others, the several objects oi the invention as afore noted are achieved. It will be appreciated that numerous changes in construction and rearrangements of the parts might be resorted to without departing from the spirit of the invention as defined by the claims.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A resistance including a sheet oi insulated material, a resistance wire encircling said sheet, a base, means connected to said Wire and to said base for mounting said sheet, and a shell also mounted by said base and having an internal diameter substantially equivalent to the width or said sheet the side edges of said sheet having slidable contact with the inner face of said shell at diametrically oposite points within the same. 2. A resistance including a sheet of insulated material, a resistance wire encircling said sheet, a base, means connected to said wire and to said base for mounting said sheet, and a shell also mounted by said base, and projecting portions formed adjacent one of the ends of said sheet and extending into a plane beyond that normally occupied by said shell whereby said shell in being applied to said base will deformably engage said projecting portions to provide parts extending to both sides of said sheet and in bracing contact against the inner face of said shell. 3. A resistance including an insulating mem ber, resistance wire disposed thereon, a base, means connected to said resistance wire and said base ior mounting said insulating member, a shell for cooperation therewith, said shell being formed with a domed top portion, the height of said shell at its side edges being slightly less than that oi said insulating member whereby the inner surface oi said shell dome engages at its peripheral edges with the upper edge ci said insulating member when said shell is positioned on said base and engages such insulating mem ber in bracing Contact.

fi. A resistor including a fiat insulating inemm bei', resistance wire carried thereby, a base, means connected to said wire and to said base ror mounting said fiat insulating member, a shell also mounted on said base, the inner surface oit' said shell deformably engaging portions oi. said flat insulating member and maintaining said :dat insulating member in a fixed position within said shell.

GEORGE J. M'UCHER.

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