US668442A - Resistance-coil. - Google Patents

Description

Patentod Fab. l9, I901.

A. c. EASTWOOD.

RESISTANCE COIL.

Application fllad Dec. 13, 1900.;

(No Model.)

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UNITED STATES PATENT OFFICE.

ARTHUR O. EASTWOOD, OF CLEVELAND, OHIO.

RESISTANCE-COIL.

SPECIFICATION forming part of Letters Patent No. 668,442, dated February 19, 190i.

Application filed December 13, 1900. Serial No. 39,739. the model.)

T0 aZZ whom it may concern.-

Be it known that I, ARTHUR O. EASTWOOD, a citizen of the United States, and a resident of Cleveland, Ohio, haveinvented certain Improvements in Resistance-Coils, of which the following is specification.

My invention relates to certain improvements in resistance-coils for rheostats, rheostatic controllers, dimmers, and similar apparatus which contains resistance made up of a number of electrically-connected sections.

It has for its object the provision of a compact form of resistance which while occupying a minimum amount of space shall be readily accessible for repairs and economical to manufacture. This objectl attain as hereinafter set forth, reference being had to the accompanying drawings, in which- Figure 1 is a longitudinal sectional view of the preferred form of my improved resistancecoil. Fig. 2 is a plan view of a pair of coils, showing the preferred form of support used therewith; and Fig. 3 is a front elevation of a series of coils arranged ready for use with electrical apparatus.

In the drawings, A is a tubular core of fireproof insulating material, such as asbestos or porcelain, upon which are wound the coils of resistance B. Through the hollow interior of the core A a rod O of conducting material is passed, having at one extremity a cap or end piece 0, also of conducting material and in electrical contact with the rod. This end piece 0 has on it a lug c, with a set-screw for the attachment of one end of the coil B. At the other end of the core A is a second cap I) of conducting material mountedconcentrically with the rod C, but insulated therefrom by a bushing a of insulating material. This cap I) also has a lug b for the attachment of the second end of the coil B and a lug N, which forms one terminal of the same.

The rod 0 is threaded at its upper end to receive nuts 0 0 one of which serves to clamp together the coil with the caps and insulating bushing and washers as a whole, and the other serves for the connection of electrical conductors, thereby forming the second terminal of the coil.

Supporting pieces or brackets D D are held by screws 01 d to a main support E, being preferably made with a solid end drilled to fit over the insulating-bushing 0t. Insulatingwashers a a serve to prevent contact between the cap I) and the bracket D, one of them also acting as a clamping-surface for one of the nuts 0 E is asupporting back piece having circular holes in it, each of which has a bushing a for the reception of the ends of the rods 0. Should this piece E be made of insulating material, such as slate, the bushings a would be unnecessary.

YVhen in use, a current would enter the coil at the terminal b pass through the cap I), and enter one end of the resistance at b. Passing through the various coils of this it would come out at the distant end and entering the cap 0 at 0 would flow to the rod .O, passing upwardly through it to the terminal formed by the nuts 0 c It will be noted that by the use of my improved form of resistance in controllers these may be placed closely side by side, thus saving space, which in manyforms of machineryas, for example, cranes and similar movable structures-is of the greatest value. In addition to this any repairs necessary upon individual coils can be easily and quickly made Without dismantling or removing the controller orin any way interfering with parts or connections other than those on which repairs are desired to be made. To remove a coil, it is only necessary to disconnect the electrical conductors running to said coil and after unfastening the bracket D to draw out the coil.

In Fig. 3 is shown a front elevation of a series of my improved coils, and the advantages of having both terminals of the coil at one end of the same will be readily appreciated by those skilled in theart.

I claim as my invention- 1. A resistance-coil Wound on a tubular insulator, an electrical conductor connected to one end of said coil and extending through the coil and through the said tubular insulator, the two terminals of the coil being thereby at the same end of the coil, substantially as described.

2. The combination of a tube of insulating material, a resistance-coil wound thereon, a metallic rod extending through said tube, means for connecting one end of the resistance-coil to the said rod and terminals on the adjacent ends of the rod and of the resistance-coil, substantially as described.

3. The combination of a tube of insulating material, a resistance-coil wound thereon, a rod extending through the said tube, a metallic plate electrically connected to said rod near one end thereof, a lug on said plate having' connected to it one end of the said resist-- ance-coil, a second metallic plate connected to the other end of the coil, but insulated from the rod, and means on the said second plate and on the rod for the connection of electrical conductors thereto, substantially as described.

4. The combination of a tubular insulator, metallic caps at each end thereof, a coil of re sistance wound on the said insulator, and electrically connecting said caps, an insulating-bushing in the tubular insulator and a metallic rod, having on it means for clamping the said insulator, the caps and the bushing' together, said rod being electrically connected to one of the plates, and being insulated from the other by said bushing, substantially as described.

5. A series of resistance-coils, each consisting of a length of Wire, a tubular insulator on which said Wire is wound, a metallic rod extending through the said insulator and connected to one end of the wire, said rod having an insulating-bushing on each end, a support having holes in it for the reception of the bushings at one end of a number of said coils, and a second support having means on it for detachably holding the bushings at the other end of said coils, substantially as described.

6. A series of resistance-coils each coil having its terminals at the same end thereof, an insulati[lg-bushing at each end of each coil, a support having holes in it for the reception of the bushings of one set of ends of all the coils, and a second support to which is attached the other set of ends of the coils by means of arms or brackets detachable from said support, substantially as described.

I11 testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR O. EASTWOOD.

Witnesses:

O. W. COMSTOCK, HERBERT P. GLIDDEN.

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