US2039974A - Resistance unit - Google Patents

Description

May 5,1936. J, J, MUCHER 2,039,974

RESISTANCE UNIT Filed April 17, 1955 z INVENTOR otontod RElKSTANfiCE WT llohn J. Mueller, Eroolrlyn, N. ll. Application it, rose, Serial No. races a ((Cl. coren.

This invention relates to resistance units, and has for an object to provide an improved construction wherein the parts are so iormed and arranged that the breakable parts are so held. as to prevent any accidental loose connections, the invention being an improvement over my copending application serial No. 7139,316 filed August 10, 1934;.

.iinother object of the invention is to provide an improved construction wherein a continuous resistance element or a plurality of abutting resistance elements may be presented and formed of wire or other material with terminals taken therefrom at spaced points, the structure being such that the terminals are permanently connected with the :cslstance element.

An additional object of the invention is to provide an improved construction of resistance element wherein two or more elements may he arranged abutting relation and terminals used at the ends of the combined structure and also to span the aloutting ends in such a manner as to looth electrically and mecl'ianically connect said ahutting ends.

in the accompanying drawingl igiue l. a top plan view of a resistance unit disclosing an einloodinient oi the invention;

2 is a longitudinal vertical sectionfl view through Fig. 1 approximately on the line 2--2;

3 is a transverse sectional view through approximately an the line 3-3;

i is an inverted perspective view of the shown in 1 before the sides have heen collapsed;

5 a hlanlr showing the A "otecting insula tic illustrated Fig. 2;

g. 6 a top planview of a resistance ole-=- illello disclosing an embodiment of invention with the terminals arranged to fit into the hlanir shorm in 5 and then he assembled into the cashig shown in Fig. 4

I. 7 is per eeth/"e view of one of the ter ii is a view similar to 6 but showing three independent sections instead of two.

Referrin .to the accompanying drawing by numerals, i indicates a casing which is torn led or position will be as shown in Fig. 2. The blank i7 is adapted to beplaced in the casing when the casing is arranged as shown in Fig. i so that the aperture i l will be opposite the central aperture in the casing and the respective apertures 9 and it will be opposite the end apertures so that after the insulating blani: i has been placed in the casing i, a resistance unit M, as

shown in Fig. 6, may be placed in position with '--'the terminal extensions it, it and i l extending through the apertures in the lolanlr l and also the apertures in the casing i so that the parts will appear as shown in Fig. l. The sides 3 and i are then bent over and pressed down tightly to pinch the various parts whereby all the parts u are held substantially against movement and also all the parts of the resistance memioenas shown in Fig. 6, are protected against breakage or injury. The parts just described, except the resistance element and terminal shown in 6, are dis-' closed and claimed'in the ahove-=noentioned co-= pending application, and, therefore, iorrn no part or the present invention except in combination.

The structure shown in 6 to it, inclusive, is new over the copending application above rnen= tioned in that the various ternunal 112 to (1G,

, inclusive, merge into has'es i5, i6 and ill,

these bases each have turned over ends it and i as shown in Fig. 7. The ends til and i9 clinched in place so as to pinch the wire or other form of resistance used. in addition it will he noted from d, that the resistance section 2c is independent of the resistance section 28, These elements while independent in construction. ahut. its shown, the elements are made of wire but they could he made of other without departing from the spirit of the invention. In elements of this kind it is quite often desirahle that one section shall Toe-oi "high resistance the other of acoinparativelr' low resistance and, consequently, they are wound with wire having different resistances. As illustrated particu ar=- ly in 6, the'section 20 has a very high ance, as, for instance, 500d chins, while the resistance of section 2d may he to ohms or ililil ohms, or some other number of chaos. llt w ll he evident that the respective sections could pre= sent the some resistance, though ordinarily this would not he the case. lliihere the sections pr sent the some resistance and are of the same length one continuous winding oi wire is prei= erahle even though an intermediate terminal is used, hut in most instances the diilerent sections have widely different resistances and wattage dis eipction and when originally till wound at different times. The arrangement of the terminals presents comparatively wide bases so as to have good contact with the wire or other winding and in case oi. an intermediate terminal base l8 there is an electrical connection between the two resistance sections and also a mechanical connection.

During the expansion and contraction of the entire unit, as shown in Fig. 2, there will never be any loose motion or loose connection between the base l6 and the wires with which it is in engagement by reason oi! the fact that the base is firmly clinched in place and presents a very strong mechanical connection as well as elec-- trical connection.

Under some circumstances it is desired to make more than just two sections as shown in Fig. 6.

In Fig. 8 this is illustrated by presenting three sections, though a greater number might be used without departing from the spirit of the invention. In the showing of Fig. 8, the intermediate terminals 22 and 23 are formed as shown in Fig. 7, and being firmly clinched in place present good mechanical and electrical connections for the various sections 24, 25 and 26. When using the structure shown in Fig. 6 with four terminals the casing I must be formed accordingly and also the insulation 1. When the structure shown in Fig. 6 is used the resistance unit may be utilized in three different circuits, while when using the structure shown in Fig. 8 the same may be in-' serted into six diilerent circuits and each circuit will have inserted therein a different resistance.

The resistance unit while being capable of use in many places is particularly adapted for use in radio apparatus and usually the unit becomes heated while in use but is cooled when the appara-- tus is turned off. This heating and cooling naturally causes the metal in casing i to expand and contract and also causes a certain action on the insulation 1. Where the various terminals 7 are merely pressed against the insulating element,

there will be a certain varying small amount of movement or shifting of these terminals as the device expands and contracts, and this produces a very small amount oi. loose connection which results in noises and other objections as ifar as radio apparatus is concerned. By providing the clinched ends l8 and H! as shown in Figp'l, all loose connections or all'looseness caused in the dcvice by expansion and contraction is eliminated. The expansion and contraction of the casing or any of the other parts will not in any way loosen or affect the electrical connection caused by the pinching action oi! the bases oi! the respective ter minals so that regardless oi the heating and cooling of the device there will always be a good also trical connection at every terminal and this condition will remain as long as the unit is usable. In eflect the clamping or clinching of the bases of the terminals causes the same to be permanently connected with the resistance unit, and in effect substantially integral with the wires thereof so that a loose connection cannot take place at any time during the use of the, device.

In the particular resistance illustrated in the drawing there is provided a base of insulating material and on this a resistance wire is wound. In the manufacture of this resistance element it is usually made in some considerable length and then out off to the desired length when completing a finished product as shown in Figs. 1 and 2.

I claim:

1. In a resistance unit of the character de scribed, a plurality of resistance elements ar-- ranged in a group end to end, each element having a base and a winding of resistance wire errtending from substantially one end to the other said resistance elements abutting in actual align ment, a terminal positioned at the respective ends of said group of resistance elements, and an inter mediate terminal positioned to straddle the abut ting ends of the respective elements, each of said intermediate terminals having a base partly errcircling and gripping the respective ends of two elements acting to mechanically and electrically connect said elements.

2. A resistance unit including a resistance element made up of a plurality of sections, said sec tions abutting, a terminal arranged at each end of said element, and an intermediate terminal arranged to straddle the abutting ends oi each of each two sections, said intermediate terminals having a base overlapping the respective ends oi! two adjacent sections formed with clinching members for clinching the base oi. said two ad jacent sections to permanently provide a me chemical and electrical connection for said ticns.

3. A resistance unit including a resistance cle ment formed of a plurality oi. sections, said sections abutting, each of said sections having an insulating base and a winding oi resistance wire extending from one end to the other, terminal arranged at each end of said resistance element and at all said abutting ends, the terminals oi the abutting ends having bases clinched around the sides and under surfaces of the respective abutting sections to electrically and mechanica ly connect said sections together, said clinched te1--- minals pinching the wires at the respective ends or said sections.

JOHN J. MUUHER.

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