US3134087A - Wire wound resistor - Google Patents

Wire wound resistor Download PDF

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Publication number
US3134087A
US3134087A US96260A US9626061A US3134087A US 3134087 A US3134087 A US 3134087A US 96260 A US96260 A US 96260A US 9626061 A US9626061 A US 9626061A US 3134087 A US3134087 A US 3134087A
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sleeve
wire
resistance
resistor
caps
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US96260A
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Haynman Alexandre
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International Resistance Co
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International Resistance Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
    • H01C1/148—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors the terminals embracing or surrounding the resistive element

Definitions

  • the present invention relates to a wire wound resistor, and more particularly to a wire wound resistor sealed in a casing.
  • an electrical resistor in a jacket or casing of an insulating material.
  • a jacket or casing serves to electrically insulate the resistor, and to protect the resistor from moisture and dirt which can adversely affect the electrical characteristics of the resistor.
  • One manner of so protecting an electrical resistor is to place the resistance element in a tubular sleeve of an electrical insulating material, and to seal the ends of the sleeve.
  • a problem with such enclosed resistors is the manner of making electrical connection to the resistance element within the sleeve.
  • One method of making electrical connection to the electrical resistance element in the sleeve is to attach terminal wires to the resistance element, which terminal wires project through the sealed ends of the sleeve.
  • the attachment of the terminal wires to the resistance element, and the providing of good seals around the terminal wires where they project from the sleeve are time consuming operations which increase the cost of the resistor.
  • Another method of making electrical connections to the resistance element is to seal the ends of the sleeve with metal caps, and electrically connect the resistance element to the inner surfaces of the caps.
  • the connection of the resistance element to the metal caps is a difficult task, particularly when the resistance element is a fine wire.
  • the drawing is a sectional view of the wire wound resistor of the present invention partially in elevation, and with a portion of the winding broken away.
  • the resistor of the present invention is generally designated as 10.
  • Resistor comprises a resistance element 12 disposed within a tubular sleeve 14 of an electrical insulating material, such as a ceramic or plastic.
  • Resistance element 12 comprises a core 16 of an electrical insulating material, such as a ceramic, plastic, or a heavy fibrous cord.
  • a resistance wire 18 is helically wound around the core 16 along the entire length of the core.
  • the resistance wire 18 may be as fine as 0.001 inch in diameter.
  • the diameter, composition, and length of the resistance wire 18 determines the resistance value of the resistor 10.
  • the end portions 18a and 18b of the resistance wire 18 are left free to extend beyond the ends of the core 16.
  • the free ends 18a and 18b of the resistance wire 18 are pulled from the ends of the sleeve.
  • Each of the free ends 18a and 18b of the resistance wire 18 is disposed Patented May 19, .1964
  • a separate cap 20 of an electrically conductive metal is placed on each end of the sleeve 14.
  • Each of the caps 20 has a bottom 22 which extends transversely across the entire end of the sleeve 14, and a tubular rim 24 which fits tightly around the outer surface of the sleeve 14.
  • the caps 20 sealingly close the ends of the sleeve 14.
  • the rims 24 of the caps 20 slide over and engage the free ends 18a and 18b of the resistance wire 18.
  • the caps 20 provide the electrical connections to the ends of the resistance wire 18.
  • the resistance wire 18 is a very fine wire, the free ends 18a and 18b which extend between the rims 24 of the caps 20 and the outer surface of the sleeve 14, do not interfere with the tight fit between the caps 20 and the sleeve 14. It has been found that when the caps 20 are placed on the ends of the sleeve 14, the sliding engagement between the rims 24 of the caps 20 and the ends 18a and 18b of the resistance Wire 18 does not break the resistance wire even though the resistance wire is a very fine wire.
  • the wire wound resistor 10 of the present invention it is only necessary to insert the resistance element 12 into the sleeve 14.
  • the free end 18a of the resistance wire 18 is then pulled across the outer surface of the sleeve 14, and the cap 20 is then forced onto and around the end of the sleeve 14 and over the free end 18a of the resistance wire.
  • the other free end 18b of the resistance wire 18 is then placed across the outer surface of the sleeve 14, and the other cap 20 forced on the end of the sleeve 14 and over the free end 181) of the resistance wire.
  • a wire wound resistor comprising a hollow sleeve of an electrical insulating material, a resistance element within said sleeve, said resistance element including a helically wound resistance wire, each of the free ends of said wire extending from a separate end of said sleeve and over the outer surface of the sleeve, and a separate cap of an electrically conductive metal fitting over each end of said sleeve, each of said caps extending over and directly electrically contacting a free end of said resistance wire.
  • a wire wound resistor comprising a hollow sleeve of an electrical insulating material, a resistance element within said sleeve, said resistance element including a helically wound resistance wire, each of the free ends of said wire extending from a separate end of said sleeve and over the outer surface of the sleeve, and a separate cap of an electrically conductive metal fitting over each end of said sleeve, each of said caps having a bottom extending transversely across an end of said sleeve and a tubular rim extending around and tightly engaging the outer surface of the sleeve, the rim of each of said caps extending over and directly electrically contacting a free end of said resistance wire.
  • a wire wound resistor comprising a hollow sleeve of an electrical insulating material, a resistance element within said sleeve, said resistance element including a core of an electrical insulating material and a resistance wire helically wound around and along said core with the free ends 4 of said wire extending beyond the ends of the core, each References Cited in the file of this patent of the free ends of said wire extending from a separate UNITED STATES PATENTS end of said sleeve and over the outer surface of the sleeve, and a separate cap of an electrically conductive metal 1,208,756 Khotinsky Dec. 19, 1916 fitting over each end of said sleeve, each of said caps 5 1,576,165 W i e Mar.

Description

May 19, 1964 A. HAYNMAN 3,134,087
WIRE WOUND RESISTOR Filed March 16, 1961 M 1 1 1 z I, I, 1 I I 14 1 1 1 1 I l I, I:
INVENTOR. ALEXANDRE HAYNMAN ATTORNEY United States Patent 3,134,087 WIRE WOUND RESISTOR Alexandre Haynman, Copenhagen-Vanlose, Denmark,
assignor to International Resistance Company, Philadelphia, Pa. s
Filed Mar. 16, 1961, Ser. No. 96,260 3 Claims. (Cl. 338332) The present invention relates to a wire wound resistor, and more particularly to a wire wound resistor sealed in a casing.
It is common practice to enclose an electrical resistor in a jacket or casing of an insulating material. Such a jacket or casing serves to electrically insulate the resistor, and to protect the resistor from moisture and dirt which can adversely affect the electrical characteristics of the resistor. One manner of so protecting an electrical resistor is to place the resistance element in a tubular sleeve of an electrical insulating material, and to seal the ends of the sleeve. However, a problem with such enclosed resistors is the manner of making electrical connection to the resistance element within the sleeve.
One method of making electrical connection to the electrical resistance element in the sleeve is to attach terminal wires to the resistance element, which terminal wires project through the sealed ends of the sleeve. However, the attachment of the terminal wires to the resistance element, and the providing of good seals around the terminal wires where they project from the sleeve are time consuming operations which increase the cost of the resistor. Another method of making electrical connections to the resistance element is to seal the ends of the sleeve with metal caps, and electrically connect the resistance element to the inner surfaces of the caps. However, the connection of the resistance element to the metal caps is a difficult task, particularly when the resistance element is a fine wire.
It is an object of the present invention to provide a novel wire wound electrical resistor.
It is another object of the present invention to provide a novel wire wound electrical resistor sealed in an insulating casing.
It is a further object of the present invention to provide a wire wound electrical resistor sealed in an insulating casing which is easy to assemble so as to be inexpensive.
Other objects will appear hereinafter.
For the purpose of illustrating the invention there is shown in the drawing a form which is presently preferred; it being understood, however, that this invention is not limited to theprecise arrangements and instrumentalities shown.
The drawing is a sectional view of the wire wound resistor of the present invention partially in elevation, and with a portion of the winding broken away.
Referring to the drawing, the resistor of the present invention is generally designated as 10.
Resistor comprises a resistance element 12 disposed within a tubular sleeve 14 of an electrical insulating material, such as a ceramic or plastic. Resistance element 12 comprises a core 16 of an electrical insulating material, such as a ceramic, plastic, or a heavy fibrous cord. A resistance wire 18 is helically wound around the core 16 along the entire length of the core. The resistance wire 18 may be as fine as 0.001 inch in diameter. The diameter, composition, and length of the resistance wire 18 determines the resistance value of the resistor 10. The end portions 18a and 18b of the resistance wire 18 are left free to extend beyond the ends of the core 16.
With the resistance element 12 disposed within the sleeve 14, the free ends 18a and 18b of the resistance wire 18 are pulled from the ends of the sleeve. Each of the free ends 18a and 18b of the resistance wire 18 is disposed Patented May 19, .1964
across the adjacent end of the sleeve 14, and then longitudinally along the outer surface of the sleeve 14 toward the other end of the sleeve. A separate cap 20 of an electrically conductive metal is placed on each end of the sleeve 14.
Each of the caps 20 has a bottom 22 which extends transversely across the entire end of the sleeve 14, and a tubular rim 24 which fits tightly around the outer surface of the sleeve 14. Thus, the caps 20 sealingly close the ends of the sleeve 14. In addition, as the caps 20 are placed on the ends of the sleeve 14, the rims 24 of the caps 20 slide over and engage the free ends 18a and 18b of the resistance wire 18. Thus, the caps 20 provide the electrical connections to the ends of the resistance wire 18. Since the resistance wire 18 is a very fine wire, the free ends 18a and 18b which extend between the rims 24 of the caps 20 and the outer surface of the sleeve 14, do not interfere with the tight fit between the caps 20 and the sleeve 14. It has been found that when the caps 20 are placed on the ends of the sleeve 14, the sliding engagement between the rims 24 of the caps 20 and the ends 18a and 18b of the resistance Wire 18 does not break the resistance wire even though the resistance wire is a very fine wire.
To assemble the wire wound resistor 10 of the present invention, it is only necessary to insert the resistance element 12 into the sleeve 14. The free end 18a of the resistance wire 18 is then pulled across the outer surface of the sleeve 14, and the cap 20 is then forced onto and around the end of the sleeve 14 and over the free end 18a of the resistance wire. The other free end 18b of the resistance wire 18 is then placed across the outer surface of the sleeve 14, and the other cap 20 forced on the end of the sleeve 14 and over the free end 181) of the resistance wire. Thus, the wire wound resistor 10 of the present invention is assembled quickly and easily so that the resistor 10 is inexpensive to manufacture.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof and, accordingly, reference should be made to the appended claims, rather than to the foregoing specifications as indicating the scope of the invention.
I claim:
1. A wire wound resistor comprising a hollow sleeve of an electrical insulating material, a resistance element within said sleeve, said resistance element including a helically wound resistance wire, each of the free ends of said wire extending from a separate end of said sleeve and over the outer surface of the sleeve, and a separate cap of an electrically conductive metal fitting over each end of said sleeve, each of said caps extending over and directly electrically contacting a free end of said resistance wire.
2. A wire wound resistor comprising a hollow sleeve of an electrical insulating material, a resistance element within said sleeve, said resistance element including a helically wound resistance wire, each of the free ends of said wire extending from a separate end of said sleeve and over the outer surface of the sleeve, and a separate cap of an electrically conductive metal fitting over each end of said sleeve, each of said caps having a bottom extending transversely across an end of said sleeve and a tubular rim extending around and tightly engaging the outer surface of the sleeve, the rim of each of said caps extending over and directly electrically contacting a free end of said resistance wire.
3. A wire wound resistor comprising a hollow sleeve of an electrical insulating material, a resistance element within said sleeve, said resistance element including a core of an electrical insulating material and a resistance wire helically wound around and along said core with the free ends 4 of said wire extending beyond the ends of the core, each References Cited in the file of this patent of the free ends of said wire extending from a separate UNITED STATES PATENTS end of said sleeve and over the outer surface of the sleeve, and a separate cap of an electrically conductive metal 1,208,756 Khotinsky Dec. 19, 1916 fitting over each end of said sleeve, each of said caps 5 1,576,165 W i e Mar. 9, 1926 having a bottom extending transversely across an end of 1,608,005 schoeppler 1926 said sleeve and a tubular rim extending around and tightly 1,910,866 Van Nostrand May 23, 1933 engaging the outer surface of the sleeve, the rim of each 2,332,255 P OISkY Oct. 19, 1943 of said caps extending over and directly electrically con- ,677,118 Stone Apr. 27, 1954 tacting a free end of said resistance wire. 10 2,680,173 Hitchcock June 1, 1954

Claims (1)

1. A WIRE WOUND RESISTOR COMPRISING A HOLLOW SLEEVE OF AN ELECTRICAL INSULATING MATEIRAL, A RESISTANCE ELEMENT WITHIN SAID SLEEVE, SAID RESISTANCE-ELEMENT INCLUDING A HELICALLY WOUND RESISTANCE WIRE, EACH OF THE FREE ENDS OF SAID WIRE EXTENDING FROM A SEPARATE END OF SAID SLEEVE AND OVER THE OUTER SURFACE OF THE SLEEVE, AND A SEPARATE CAP OF AN ELECTRICALLY CONDUCTIVE METAL FITTING OVER EACH END OF SAID SLEEVE, EACH OF SAID CAPS EXTENDING OVER AND DIRECTLY ELECTRICALLY CONTACTING A FREE END OF SAID RESISTANCE WIRE.
US96260A 1961-03-16 1961-03-16 Wire wound resistor Expired - Lifetime US3134087A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088492A2 (en) * 1982-02-03 1983-09-14 Electronic Concepts, Inc. A means and a method for converting finished electrical components with terminal leads to elements having planar terminations
US4538205A (en) * 1982-02-03 1985-08-27 Electronic Concepts, Inc. Means and method for fabricating planar terminated capacitors
US8314677B1 (en) * 2011-11-21 2012-11-20 Ty-Ohm Electronic Works Co., Ltd. Overcurrent protective wire wound resistor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1208756A (en) * 1914-09-19 1916-12-19 Central Scientific Co Electric heating unit.
US1576165A (en) * 1924-09-10 1926-03-09 Gen Electric Electric fuse and method of making same
US1608005A (en) * 1924-06-03 1926-11-23 Walter B Schoeppler Grid leak
US1910866A (en) * 1930-03-25 1933-05-23 Telautograph Corp Resistor
US2332255A (en) * 1942-03-10 1943-10-19 Sprague Specialties Co Electrical resistor
US2677118A (en) * 1951-10-31 1954-04-27 Gen Electric Electric lamp or similar device and method of manufacture
US2680173A (en) * 1951-08-06 1954-06-01 Chase Shawmut Co Electric fuse

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1208756A (en) * 1914-09-19 1916-12-19 Central Scientific Co Electric heating unit.
US1608005A (en) * 1924-06-03 1926-11-23 Walter B Schoeppler Grid leak
US1576165A (en) * 1924-09-10 1926-03-09 Gen Electric Electric fuse and method of making same
US1910866A (en) * 1930-03-25 1933-05-23 Telautograph Corp Resistor
US2332255A (en) * 1942-03-10 1943-10-19 Sprague Specialties Co Electrical resistor
US2680173A (en) * 1951-08-06 1954-06-01 Chase Shawmut Co Electric fuse
US2677118A (en) * 1951-10-31 1954-04-27 Gen Electric Electric lamp or similar device and method of manufacture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088492A2 (en) * 1982-02-03 1983-09-14 Electronic Concepts, Inc. A means and a method for converting finished electrical components with terminal leads to elements having planar terminations
EP0088492A3 (en) * 1982-02-03 1985-04-24 Electronic Concepts, Inc. A means and a method for converting finished electrical components with terminal leads to elements having planar terminations
US4538205A (en) * 1982-02-03 1985-08-27 Electronic Concepts, Inc. Means and method for fabricating planar terminated capacitors
US8314677B1 (en) * 2011-11-21 2012-11-20 Ty-Ohm Electronic Works Co., Ltd. Overcurrent protective wire wound resistor

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