US2055849A - Electrical resistor - Google Patents

Description

Sept. 29, 1936. J. J. MUCHER ELECTRICAL RESISTOR Filed Oct. 11, 1934 INVENY'OR I 51. ii? 1" A TTORNEYJ.

v Patented Sept. ,29, 1936 UNITED STATES PATENT- OFFICE ELECTRICAL RESISTOR John J. Mucher, Brooklyn, N. Y.

Application October 11, 1934, Serial No. 147,909

1 Claim. (Cl. 20163) This invention relates to electrical resistors and more particularly to resistors such as used in radio receiving apparatus, and the invention concerns a terminal and attaching tip therefor which is in the nature of an improvement upon the resistor set forth in my copending application, Serial No. 710,298, filed February 8, 1934, which has matured into Patent No. 1,987,489, Jan. 8, 1935.

The invention broadly resides in a resistor 01 the indicated character which includes a flexible terminal wire having a hollow headed inner end telescopically fitted over the end portion oi. the resistance winding which projects beyond the insulation covering, and a tubular attaching tip having an inner portion surrounding and protecting the end portion of the insulation covering with an outer portion compressed upon the headed inner end of the terminal wire.

More particularly the present invention comprehends a resistor including an improved terminal fashioned from a length of wire having its inner end coiled to provide a series of closely related convolutions which define a hollow head surrounding a resistance winding and its core adjacent its outer end, and a tubular attaching tip which covers the headed inner end of the terminal and is compressed about the same with an aperture in its outer end of less size than the terminal head and through which the terminal wire protrudes so as to eiiectively secure the attaching tip, the terminal wire, the winding and the core of the winding in assembled relation.

As a further object, the invention provides an electrical resistor of the character set forth which is comparatively simple in its construction and mode of assembly and which is highly efficient for its intended purpose.

With these and other objects in view, the invention is disclosed in more detail in the specincation and drawing which sets forth one embodiment, while the appended claim coversvariations and modifications which fall within the scope of the invention. In the drawing:

Fig. 1 is a side view of an electrical resistor constructed in accordance with the-invention.

Fig. 2 is an enlarged fragmentary sectional view therethroush. so rlg.3isanenlargedperspectivcviewofthe improved terminal wire.

Pig. 4 is an enlarsed transverse sectional view taken approximately on the line 4-4 of Fig. 1.

Referring to the drawing by characters of ref- 65 ercnce, ll designates a core of a resistor which is made of any suitable non-conducting or insulating .material which is preferably compressible. A resistance wire or element ii is continuously wound about the core and a flexible casing or sheath l2 of insulating material covers or encases 5 the winding or core and terminates in spaced relation to the ends thereof to expose the opposite end portions of the resistance wire or element H.

A terminal i3 is provided for each end of the resistor which is preferably of a bendable wire 10 and formed with an integral hollow head N at its inner end, of a size to snugly fit over the exposed end portion of the resistance wire or element II which protrudes beyond the insulating casing or sheath I2. In the instant embodiment, 15 the hollow head I! is formed by coiling the inner end of the terminal wire [3 to provide a series of closely related convolutions.

The resistor is completed by employing a metallic attaching tip or cap l5 which is of a sub- 20 stantially cup-shape form, and is of a size at its inner end to snugly fit over the insulation casing or sheath i2 and has its outer end l6 formed with an aperture ll of a size to receive therethrough the terminal wire i3 and which aperture is of 25 less size than the headed end I.

The hollow headed end I4, which is preferably preformed, is telescopically fitted over the resistance winding. and its core Ill, and the attaching tip I5 is then applied by slipping the aper- 30 tured end It over the outer end of the terminal wire it, then positioning the tip over the hollow headed terminal I4 and in surrounding relation to the end portion of the casing or sheath II. The outerend portion l8 of the attaching tip I 5 is 35 preferably of reduced cross sectional size so as to initially snugly fit over the hollow headed inner end ll of the resistance wire and the portion I8 is then subjected to a radial inward pressure to compress the same about the hollow headed 40 inner end ll of the resistance wire which in turn compresses the headed end ll, the winding II and the core I0, thus embedding the resistance winding II in the core l0 and interlocking the headed end II and the outer end l8 of the tip so as to effectively secure the parts in assembled relation. Due to this construction and arrangement, the parts are securely bonded together thereby. insuring a positive electrical connection directly from the terminal wire I! to the resist- 5 ance winding ll without resorting. to the use of solder.

What is claimed is: 4

An electrical resistor including a core of insulation material, a resistance winding thereon and 56 insulation covering thereover spaced from the ends of the core, a flexible terminal wire having a. pre-formed spirally wound wire end composed of closely adjacent convolutions defining an enlarged hollow head closed at the outer end at the juncture of the same with the terminal wire and telescopically fitted over and enveloping the end portion of the resistance winding and core projecting beyond the insulation covering, and a tubular attaching tip having an inner portion surrounding and protecting the end portion of the insulation covering, and an outer portion compressed upon the headed inner end of the terminal wire and formed at its outer end with an aperture of less size than the headed end of the terminal wire and with the terminal wire protruding from the aperture.

JOHN J. MUCHER.

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