US1006655A - Electric resistance. - Google Patents

Description

R. C. HARRIS,

ELECTRIC RESISTANCE.

APPLIGATXON TILED r1112. 18, 1913.

1,006,655 I Patented Oct. 24 1911. Q 2 SHEETS-SHEET 1.

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ELECTRIC RESISTANCE,

APPLIQMIOH FILED FEB.18,1911.

Patented Oct. 24, 2 SHEETS-$11331 WITNESIJES wwaw A) INVENTOR ROBERT-614A R LES'HARRIfi.

' UNITED'STATES PATENT OFFICE.

ROBERT CHARLES HARRIS, F GATESI-IEAD, ENGLAND, ASSIGNOR '10 CLARKE CHAIR- MAN AND COMPANY LIMITED, OF GATESHEAD, ENGLAND.

ELECTRIC nnsrs'rmfcn.

Specification of Letters Patent.

Application filed February 18, 191}. Serial No. 609,460.

sup 'lorted by but one binding rod and re-' qulring no slotted holds or special bends a nsi on.

ie invention the strip is :ies of holes, pitched apart and then bent to a form that the into alinement and lance 'llllt having stable looped alternately at opporod that extends terribly the holes in aced and the distance l the holes thereby ops nt equal length. ar the holes might be uneqn. s to enable loops at one side to be made longer than loops on the other side thereof, or to enable both. long and short loops to be arranged at each side of the red, the long loops alternating with the short loops. In other cases the holes could be arranged to gradually increase in pitch until the center is reached, and then to decrease. The resultantunit would in this case have a circular form. The binding rod may be made of insulating material or of metal covered with a suitable insulator. The loops of the strip of the unit may be separated in various ways. Thus a single insulating washer may be placed between each adjacent pair of faces it's-of the strip. Or a number of washers may be placed between such pairs of faces, in which case one washer need alone be of insulating material. In the accompanying drawings Figure 1 is a side elevation of the two end portions of one form of resistance unit according to the invention. Fig. 2 is an end elevation of the left hand portion of Fig. 1 and Fig. 3 is a central horizontal section corresponding to Fig. 1. Fig. 4 is'a. central hori- \t in .still further modifications.

zontal section of a portion of a modified form of-resistance unit and Fig. 5 is a similar view illustrating a further modification. Figs. 6 and 7 are views similar to Fig. 3 of Fig. 8 shows a portion of strip material for use in units shown in the preceding figures.

In the example according to Figs. 1 to 3,

Patented Oct. 24., 1911.

A is the strip, corrugated longitudinally at b and r: to within a short distance of the to previous to oorrugationbeing punched with holes B as shown in Fig, 8. C is the binding rod of metal covered with suitable insulating material D. E are insulating washers and F metal washers placed between the folds of the strip. H are the terminals serving to support the. unit. L are nuts and m spring washers serving to clamp the strip, washers and terminals together.

- Fig. illustrates a modification wherein electrical connection is made with the unit intermediate of its length, G being a conductor or terminallocated in contact with one of the metal 'asncrs F. As another mode of effecting connection with the strip of the unit intermediate of its length, suitable Wnen the binding rod is of metal propcrly insulated. a collar may be formed on or fixed to the binding rod at the required position so as to make contact. with the strip, there being then a terminal at each end of the strip and a terminal connected to the binding rod, the'current passing through part of the latter.

A compound washer for carrying out the foregoing modification is illustrated in Fig. 5 where J is a collar split, preferably at one point, and having an exterior taper. K is a complete collar having a corresponding interior taper, the said collars when clamped together with the remaining elements causing good electrical contact. to be made with the binding rod 0. P represents a. conductor or terminal in electrical connection with the clamping rod G.

In some cases in lieu of having a. terminal arranged at opposite ends of the strip, one end of the latter can, as shown in Fig. 6 be clamped as by nuts Q to the rod C, one terminal H being employed in direct electrical connection with the opposite end of the strip and another terminal H located .adjacent to the terminal H in electrical conaid fggc flowing the whole length of the binding r Fig. 7 shows a further modification in which in lieu of the nuts Q, one such nut Q, and collars J and K as described with reference to Fig" are employed for connecting the end of the strip to the rod 0.

The form of the washers for separating the portions of the strip will depend upon the nature of the corrugations in the strip.

What I claim is v 1.. A resistance unit comprising a'metal strip having perforations spaced throughout its length, and folded intermediate of the perforations so as to bring the latter into v aline-ment, and a support extending through said perforations.

'2. A resistance unit comprising a metal strip having perforations spaced throughout its length and folded intermediate of the perforations so as to bring the latter into alinement, an insulating rod extending through said perforations and insulating devices disposed between the several. loops formed by the folds in thestrip.

3. A resistance unit comprising a. metal strip having perforations spaced throughout its length and folded intermediate of the perforations so as to bring the latter into alinement, an insulating rod extending through said perforations, a pair of metal washers threaded on the rod between each loop formed by the folds in the strip, an insulating washer between each pair of metal washers and means upon the rod for clamping the metal strip and washers together.

4. A resistance unit comprising a metal strip having perforations spaced throughout its length and folded intermediate of the perforations so as to bring the latter into alinement, an insulating rod extending through said perforations, insulators disposed between the sevaral loops formed by the folds in the strip, means clamping the strip and washers together upon the rod and a terminal in electrical contact with the strip intermediate of its length. l

5. A resistance unit comprising a metal strip having perforations spaced throughout its length and folded intermediate of the perforations so as to bring the latter into alinement, an insulating rod extending fiirough said erforations, a pair of metal ,ashers threa ed on the rod between each .Toop formed by the folds in the strip, an insulating washer between each pairtof metal washers a terminal in electrica contact with one of said metal Washers and means 11 n the rod for clamping the metal strip'and washer embracing the rod and in electrical connection therewith; a clamping ring en circling the said washer and in electrical contact with both the ring and one portion of the strip intermediate of its length, insulating devices separating the several loops formed by the folds in the strip, devices on the rod for clamping the metal strip and washers together and a terminal in electrical connection with the rod.

. 7. A resistance unit comprising a strip of metal punched with holes at predetermined intervals, corrugated longitudinally to within a short distance of points midway between 'the holes and folded at such points to bring the holes into alinement and form stable loop-like portions extending alternately in opposite directions from the axis common to the alined holes.

8. In a resistance unit, the combination with a metal clamping rod, a strip of metal, folded into loops, threaded on said rod, and an insulating sleeve separating the strip from the rod, of a compound Washer adapted to place the rod in electrical connection with the strip.

9. In a resistance unit, the combination with a metal clamping rod, a strip of metal, folded into loops,-threaded on said rod, and an insulating sleeve separating the strip from the rod, of a compound washer adapted to place the rod in electrical conncction with the strip, a terminal in electrical connection with. the rod at one end of,the unit and a terminal adjacent to the other terminal insulated from the rod and in electrical connection with the strip.

Signed at Gateshead this second day of February 1911.

ROBERT CHARLES HARRIS.

'VVitnesses:

' TnoMAs W. THOMPSON,

CHARLES P. YOUNG.

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