US1982475A - Resistance unit - Google Patents

Description

N 1 v J. J. MUCHER 1,982,475

RESI STANCE UNIT Original Filed April 18, 1933 l4 INVENTOR y WIEESSES j1/m J. Mac/1e1- aw ./%0 a 1 BY 72 M J ATTOENEYS Patented Nov. 27, 1934 RESISTANCE UNIT John ll. Muc'iier, Brooklyn, N. Y.

Original application April-1s, 1933, Serial as. 666,765, now Patent No. 1,978,624, October 9,

Divided and this application September 23, 1933, Serial No. 890,730

(Cl. cor-cs) 3 Claims.

' This invention relates to electrical resistance devices, and more particularly to an electrical resistance device for radio apparatus and other electrical devices in circuits requiring one or more 5 fixed resistances capable of being readily inserted into the circuit.

An object of the invention is to provide an inrproved constuction of resistance mounted on a I single core and provided with a number of taps '10 or terminals at spaced points so that various amounts of resistance may be secured within the limits 0! the device according to which pair of terminals are being used.

Another object of the invention is to provide a desired flexibility in combining diflerent resistance ranges to constitute the resistance requirements of one or morev circuits.

This application is a division of my prior application Serial No. 868,765, filed April 18, 1933, which issued as Patent 1,376,624, October 9, 1934. In the present invention there is provided means for presenting a resistance for various purposes and dividing this resistance up into sections or units as far as the resistance is concerned while maintaining a single resistance body. In iorminga structure of this kind a resistance element as, for instance, a resistance wire is wound on a core divided into different sections the sections being, if desired, 0! the same resistance or a different resistance, and connected by terminals so that by the use'ot different terminals different resistances may be provided for different circuits without moving or adjusting any or the parts. w v I in the accompanying drawing- Flgurel is a plan view of a resistance disclosing an embodiment of the invention, certain parts being broken away to better illustrate the construction. 7

Figure 2 is a longitudinal vertical sectional view through Figure 1 on the line 2-2.

Figure 3 is an end view of the resistance unit shown in Figure 1.

Figure 4 is a plan view of the resistance ele- ,45 ment removed, the same having the terminals associated therewith; 1

Figure 5 is an end view of the resistance element shown in Figure 4 together with an insulating wrapping therefor. Figure 8 is a plan view on a reduced scale of the insulating wrapping shown in Figure 5.

Figure 7 is a plan viewon a reduced scale 01 the metal casing and clamping structure shown ,in Figures 1 and 2. Figure B is a perspective view of one of the intermediate terminals illustrated in Figures 1, 2 and 3.

Referring to the accompanying drawing by numerals 1 indicates the core which is cl some desired kind of insulating material, said core being 50 provided with windings 2, 3 and 4 of wire forming resistance elements. These windings are preferably spaced apart at the points 5 and 8, though this is not essential. However, preferably the units 2. 3 and 4 have present difierent amounts of resistance so that there is presented a certain flexibility in connecting the device toone or more circuits through the terminals '7, 8,

9 and 10. Terminals 8 and 9 are as shown in Figure 8 and each of these terminals is formed with a base 11 and depending extensions 12 and 13.

. The terminal extension 14 extends upwardly from the base 11, said extension preferably having an aperture 15. These terminals are made of a proper size so that the depending portions 12 and 13 may fit into the respective notches 16 and 17 forming resistance unit 1,\ as shown-in Figure 4.

' By this arrangement the base 11 and depending portions 12 and 13 all contact firmly with adjacent ends or the resistance wires. Thus it will be seen that a certain resistance is secured when connecting the circuit with the terminals 7 and 8, while a different resistance may be secured ;by connecting the circuit with terminals 8 and 9, or terminals 9 and 10. Still other combinations may be secured by merely shifting the wires irom one terminal to another so as to include more or less or the resistance.

After the parts have been arranged as shown in Figure 4 an insulating member 18 is applied. The various apertures 19, 20, 21 and 22 are formedto accommodate the various terminalpxtensions 14 of the respective terminals. The insulation 18 is, of course, of a proper size so that it may be forced flatwise down on top or the structure, as shown in Figure 4, and then the side flange's'23 and 24 are bent around as illustrated in Figure 5,

the end flanges 25 and 26 being preferably first bent around so as to be overlapped somewhat by the side flanges. After this has been done ,the metal covering and clamping plate 27 ismoved down flatwise over the structure, the members 14 projecting through the various apertures 28, 29,

30 and 31 without contacting therewith. The end members or the extensions 32 and 33 are then bent down as shown in Figure 3, so that in a certain sensethere is ovided a straddling action 'i'or the end termina s which holds them against moving longitudinally away from the core 1 or the resistance wires. The side members or flanges 34 and 35 are then bent down and around as illustrated in Figure 3.

As the cover 27 is of metal and comparatively stifi though more 'or less resilient, there will be a clamping or pinching action when the parts are arranged as in Figure 3, whereupon all of the bases 11 will be clamped firmly against, the wire. It will be noted that the bases 11 on the end terminals are arranged beneath theresistance elelid merits, while the other terminalsare arranged above (Fig. 2). Also preferably the bases ii. on the end terminals do not have the depending flanges 12 and 13 as shown in Fig. 3.

After the metal covering 27 has been firmly clamped in position so that it will appear as shown in Fig. 3, the device is complete and ready for use. If desired suitable end members 36 and 3'7 may be provided to hold the resistance device in the desired position. Each of these members consists of a fiat piece 38. merging into side clamping members 39 and 40 which slide over the cover 27 and hold the parts in position by friction. It will be understood? of course, that the members 3'7 and 36 may be dispensed with without departing from the spirit of the invention.

I claim:--

l. A resistance unit comprising a substantially flat narrow insulating core, a winding thereon of resistance wire, said winding being in a plurality of sections, each section comprising a different? resistancaa pair of terminal clips arranged at theends of the core and in engagement with the ends of the winding, said core intermediate the ends having a notch at each side at the place where the sections change, a terminal for each pair of notches, each of said terminals having a pair of depending flanges fitting into said notches, an upstanding portion and a fiat body acting to bridge adjacent ends of difierent sections; an

insulating covering for said resistance wire and the terminals except the upwardly extending portions,,and a metal sheathing for holding the insulating covering and the terminals in operative position said metal sheathing including an encircling portion and a depending lug at each end for overlapping the end part of said insulating covering and said end terminals.

2. A resistance unit comprising a fiat insulatingat J core having a plurality of pairs of notches on each side intermediate the ends, a resistance winding arranged on said core and extending substantially from one end thereof to the other, said winding fitting into said notches, an insulating covering for said winding, a metal sheathing for said insulating covering, a substantially U-shaped clip formed with a base positioned to straddle said sheathing at each end, a contact terminal for each pair ofsaid notches, on each side substantially U-shaped to straddle the base and wires each of said terminals having a base and a pair of depending flanges fitting into said notches, and an upstanding portion, an insulating covering for said resistance wire and the base and flanges of said terminals, and a metal sheathing for holding the insulating covering and the terminals in operative position, said sheathing acting to press the bases of the terminals againstthe resistance wire whereby the terminals are held in engagement with said wires by friction only.

3. A resistance unit comprising an insulating core substantially rectangular in shape andprovided with a plurality of pairs of notches arranged in'each side, said notches being arranged in pairs, a winding of resistance wire arranged on said core, certain sections of said wiring being arranged between the ends of said core and certain of said notches, the remaining sections being arranged between the notches, a terminal for each end of said core, each of said terminals having a fiat portion adapted to engage fiatwise the wire at the respective ends of the core, a terminal for each pair of said notches, said last mentioned terminals having flat portions for engaging the adjacent sections of wire so as to electrically con-

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