US1021256A

US1021256A - Resistance.

Info

Publication number: US1021256A
Application number: US53679010A
Authority: US
Inventors: Robert Miller Jr
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1910-01-07
Filing date: 1910-01-07
Publication date: 1912-03-26
Anticipated expiration: 1929-03-26

Description

fit zzi-ak- Maw R. MILLER, JR.

RESISTANCE.

APPLICATION FILED JAN. 7, 1910 LO21,256 I latented Mar. 26, 1912.

ance

Low res 4- High sisfance m &1 HUBEHI MILLER JR.

Hi5 ATIJEVEX UNITED STATES PATENT OFFICE.

ROBERT MILLER, JR, OF.SCHENECTA DY, NEW YORK, ASSIGNOR TO GENERAL ELECTBIQ COMPANY, A CORPORATION OF NEW YORK.

nnsrsranclii.

Specification of Letters I'atent.

Patented Mar. 26, 1912.

' To all whom it may concern:

Be it known that 1, ROBERT MILLER, J r., a citizen of the United States, residin at- Schenectady, county of Schenectady, tate of New York, have invented certain new and useful Improvements in Resistances, of

which the following is a specification.

,My invention relates to resistances for electric circuits, particularly resistances used as shunts in connection w1th various electrical devices, such as measuring instruments, and'the object of my invention is to provide a simple and rugged resistance device or shunt of high efficiency, which has a lower operating temperature than shunts heretofore used and which may be easily and quickly calibrated and adjusted to vary the ohmic resistance of the device.

In accordance with my inventiomnthe-"re sistance or shunt is formed of -meta1 wires or strips of any desired shape interlaced or otherwise suitably arranged to form a network or gauze having numerous meshes through which air or other cooling fluid may circulate freely and thereby maintain the temperature of the resistance within the desired limits. The wires or strips which constitute the network may be arranged in any desired manner so long as they are in contact or in good thermal relation and form an open mesh structure suit-ably positioned so that air or other cooling fluid may flow freely over and through it. The ohmic resistance of the resistance device or shunt may be varied and'the shunt calibrated by varying the conducting capacity of any of the wires, or by shiftingthe cross wires with reference to the longitudinal wires. In the preferred construction high resistance wires are strung parallel to each other. in the same plane while transverse wires are strung on a movable support so as to be in good thermal and electr1cal en agement with the high resistanc wires, so t at adjusting the movable upport moves all the transversewires simultaneously to vary the angle between them and the high resistance wires, thereby varying the ohmic resistance of the device. My invention will best be understood in connection with the accompanying drawing which shows merely for purposes of illustration one of the forms in which my invention may b embodied and in which- Figure 1 is a plan yiew of an adjustable resistance or shunt and Fig. 2 an end view of the adjustable resistance shown in Fig. 1, with a rtion broken away to show the relation 0 the transverse wires to the longitudinal high resistance wires.

I have shown one form of adjustable do;

vice embodying my invention comprising a.

suitable base 1 carrying metallic terminals 2 between which a series of bridges 3 of insulating material are mounted, and between which, longitudinal wires 4 of any suitable in h resistance metal are strung over the bridges 3. The transverse wires 5, which are of copper or any other suitable heat conducting material, are so related to the longitudinal wires 4 as to form an open mesh network, and may be mounted in any suitable way which will bring'them into good thermal relation to the high resistance. wires, 'so that the transverse wires" form "electrical oonnecs tions bet-ween the longitudinal wires and also rapidly conduct the heat away from them. The transverse wiresmay be loosely interlaced with the longitudinal wires, if dies sired, but in the preferred construction the longitudinal wires are all mounted in the same plane. while the transverse wires 5 are strung in firm engagement with the longitudinal wires and over insulating bridges 6 mounted on a movable metallic support 7,

which is provided with a handle 8 and is pivotally secured to' the base 1 by means of a'stud or pivot 9. All of the wires 5 may be simultaneously moved with reference to the longitudinal wires by shifting the adjustable support 7. When the adjustable support is in the osition shown in Fig. 1,- the .resistanceo the device is the maximum; as the adjustable support is turned about the pivot '9 the angle between the transverse wires 5 and the resistancewires 4 becomes more and more acute, and at the same time the ohmic resistance between terminals 2 decreases, until finally when the wires 5 are substantially parallel to. the resistance wires 4 the ohmic resistance of the device is a minimum, By means of this construction the ohmic resistance may be increased or decreased in a uniform manner instead of by steps, as, in many forms of adjustable resistance heretofore used. I I

My invention may be embodied in many other forms than that shown and described, and I do not limit it to the precise arrangement disclosed, but intend to cover by the appended claims all forms and modifications within the spirit and scope of my invention.

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

1. In an adjustable resistance, the combination with longitudinal high resistance wires of transverse heat conducting wires adjustably mounted in good thermal relation to said longitudinal wires to form a network and to be adjustable to vary the angle between said longitudinal. wires and said transverse wires.

2. An adjustable resistance comprising wires arranged tofforma network-in which the wires may at will be adjusted with referenee to one another.

3. An adjustable resistance comprising longitudinal wires, supports for said longitudinal wires, and transverse wires loosely arranged with reference to said longitudinal wires toform a network in which the angle between each transverse wire and the longitudinal wires may be varied at will.

.4. An adjustable resistance comprising wires of different metals arranged to slide over each other and to form a network in whichthe wires are relatively adjustable.

5. In an adjustable resistance, the combination with longitudinal wires, of transverse wires mounted in sliding engagement 'with said longitudinal wires to form a network and to be adjustable with reference to said longitudinal wires whereby the angle between said transverse and said longitudinal wires may be varied at will.

6. An adjustable resistance comprislng N wires of manganin and transverse wlres of copper mounted to engage said manganin strips to form a network and to slide over 4 said strips to vary the angle between said manganin stri s and said copper wires.

7. In an ad ustableresista-nce, the combi. nation with resistance wires, of transverse wires'movably mounted in engagement with said resistance wires, and means for simultaneously moving all said transverse wires relatively to saidresistance wires.

8. An adjustable resistance comprising longitudinal wires of high resistance metal,

a support for holding sald wires in position to permit free access of air, a second support ad ustably mounted with relation to said resistance wires, and cooperating wires mounted on said second support to engage said