US825211A

US825211A - Resistance unit.

Info

Publication number: US825211A
Application number: US26950705A
Authority: US
Inventors: Harry E Heath
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1905-07-13
Filing date: 1905-07-13
Publication date: 1906-07-03
Anticipated expiration: 1923-07-03

Description

PATENTED JULY 3, 1906.

H. HEATH. RESISTANCE UNIT. APPLICATION FILED JULY 13. 1905.

Inventor.

Harrg E Heath.

HARRY E. HEAT ELEOTRI inrnnr enric ii, OF LYNN, IVIASSACHUSETTS, ASSIGNOR TO GENERAL C COMPANY, A CORPORATION NElV YORK.

RESZSTANCE- nun".

i l'o. 825,21 1.

Specification of Letters Patent.

Patented July 3, 1906.

To (:15 whom it may concern:

Be it known that I, HARRY E. HEATH, a citizen of the United States, residing at Lynn, county of Essex, State of ltiiassachusetts,

have invented certain new and useful Im' provements in Resis t ance Units, of which the following is a specification.

This invention relates to resistance units for electric circuits, and has for its object the provision of a device of this character which is light, cheap to construct, and at the same time is thoroughly eiilcient and durable.

Many forms of resistance units are known to the electric art, one of the principal forms being what is known as the resistance grid. This form of unit is objectionable by reason of its excessive weight and for many other reasons well known to those skilled in the art. The object of, my invention is to construct a unit which will take the place of the grid by overcoming the objections thereto, although its uses are not limited to those of the grid, since it is well adapted to any of the ordinary uses to which a resistance unit may be subjected. In carrying out my invention I provide an insulating material, such as inicanite or asbestos, oi the size and shape desired. Upon this material as a core I wind a strip of resistance material, such as sheet-iron, the winding being of course in an open spiral, so as not to short-circuit the turns. In order to lock the conductor in place on the insulating material, corrugate the sheet preferably in the direction of the length of the strips. This not only secures the strips to the core, but gives rigidity in the direction oi-the corrugations to the unit as a whole.

My invention further consists in'the details of construction and in the arrangement and combination of elements hereinafter set forth,

and particularly pointed out in the claims annexed to and forming a part of this applicatron.

in the drawings, in which is illustrated one form. of my invention, Fl ure 1 is a plan view of my resistance unit. 1 ig. 2 is a side elevation thereof, and Fig. 3 is a section taken on the line 3 of 1 i .1.

Referring to t e drawings, 1 is a sheet of insulating material, such as micanite or asbestos, the latter being prefaable, due to its cheapness and flexibility.

2 is a resistance-conductor, such as sheet iron in the form of a strip spirally wound upon the insulating material, as shown in the drawings. I now corrugate the sheet, so as to secprely lock the turns in place. These corrugations also increase the stiffness or rigidity of the unit and they ma run in any direction or in more than one irection, if desired. The terminals 3 are'secured to the ends of the conductor by rivet or any other well-known manner.

It will thus beseen that I have provided a resistance unit which is exceedin ly cheap and light and can be subjected to t e roughest usage without injury. The conductingstrips are secured to the insulating material without the aid of any rivets or any kindred devices, and the method of production is of the simplest. The strip is simply wound upon the insulating-sheet and passed through rollers to form corrugations. The unit, moreover, will stand high temperatures and will not crack when subjected to sudden changes in temperature.

What I claim as new, and desire to secure by Letters Patent ol' the United States, is

l. A flexible corrugated resistance unit comprising an insulating material having a resistance-conductor wound thereon.

2. A corrugated resistance unit comprising a flexible insulating material having a resistance-conductor wound-thereon.

3. A resistance-unit comprising an insulating material having a resistance-conductor wound thereon and secured thereto by inden tations.

4. A resistance unit comprising a sheet of flexible insulating material having a resistance-conductor spirally wound thereon and locked thereto by corrugations.

5. A resistance unit comprising a web of flexible insulating material traversed by a resistance-conductor and stiffened by corrugations.

6. A resitance unit comprising a sheet of asbestos, a resistance-conductor wound thereon and secured thereto by corrugations.

7. A resistance unit comprising a sheet of asbestos having an iron strip wound thereon and provided with terminals, said sheet being corrugated throughout.

8. A resistance unit comprising a sheet of insulating material having a resistancc-strn) wound thereon, said unit being provided with grooves running in a substantially lonrob gitudinal direction of said strip-and engaging In witness whereof I have hereunto set my each turn thereof. i band this 11th day of July, 1905.

9. A resistance unit comprising a sheet of asbestos, an iron strip spirally Wound there- HARRY HEATH 5 on, said unit being provided with grooves run- Witnesses:

ning in a substantially longitudinal direction JOHN A. MGMANUS, J12,

of said strip and engaging each turn thereof. 7 J OHN G. OALLAN