US3688811A - Method of establishing a warp joint of a stranded wire and stranded wires used therein - Google Patents

Method of establishing a warp joint of a stranded wire and stranded wires used therein Download PDF

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Publication number
US3688811A
US3688811A US17050A US3688811DA US3688811A US 3688811 A US3688811 A US 3688811A US 17050 A US17050 A US 17050A US 3688811D A US3688811D A US 3688811DA US 3688811 A US3688811 A US 3688811A
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US
United States
Prior art keywords
stranded wire
wire
stranded
wires
wrapping
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Expired - Lifetime
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US17050A
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English (en)
Inventor
Kunimasa Moriyama
Tomio Kogure
Kozi Sakai
Keisaku Takeuchi
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Individual
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/033—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for wrapping or unwrapping wire connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
    • H01R4/14—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by wrapping
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49123—Co-axial cable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49174—Assembling terminal to elongated conductor
    • Y10T29/49181—Assembling terminal to elongated conductor by deforming
    • Y10T29/49185—Assembling terminal to elongated conductor by deforming of terminal
    • Y10T29/49192—Assembling terminal to elongated conductor by deforming of terminal with insulation removal

Definitions

  • ABSTRACT A method of establishing a wrap joint of a stranded wire consisting of a strand of a plurality of wires twisted together, wherein said stranded wire is wrapped around a terminal rod in a direction opposite to the direction of twist thereof.
  • a stranded wire consisting of a strand of a plurality of wires and an insulating sheath covering said strand, said strand being twisted to such an extent that it will not be untwisted in the sheath stripping operation and further coated with a conductive material as required.
  • the present invention relates to a method of establishing a wrap joint of a stranded wire and to a stranded wire used therein.
  • Wrap joint is being widely used in a variety of electric and electronic apparatuses, owing to its high reliability and high workability.
  • the application of the wrap joint has heretofore been limited only to a single-core wire.
  • An object of the present invention is to make the wrap joint of a stranded wire possible and thereby to enable the electric wire connections in various types of apparatuses to be achieved entirely by wrap joint.
  • Another object of the invention is to provide a wrap joint of a stranded wire which is less inferior in its characteristics, such as contact resistance and wrapping strength, to the wrap joint of a solid wire, and also to provide a stranded wire suitable to such wrap joint.
  • the first feature of the invention resides in the fact that a stranded wire is wrapped around a terminal rod in a direction opposite to the direction of twist of the stranded wire.
  • the second feature of the invention resides in the fact that the stranded wire used is twisted at a high pitch so as to enhance the effect of the first feature set forth above, whereby it is possible to ease the insertion of the wire into the wrapping tool, to increase the wrapping strength and to obtain a wrap joint of small contact resistance.
  • the third feature of the invention resides in the fact that the stranded wire used is coated, for example, with solder, tin or silver. By so doing, it is possible to obtain exactly the same characteristics as those of a wrap joint ofa solid wire.
  • FIG. 1 is a perspective view showing a stranded wire lapped around a terminal rod
  • FIG. 2 is an illustrative view for explaining the method of wrapping the stranded wire as shown in FIG.
  • FIG. 3 is a perspective view showing an embodiment of the stranded wire used in the present invention.
  • FIG. 4 is a circuit diagram showing a method of measuring the contact resistance of the wrap joint
  • FIG. 5 is an illustrative view showing a method of measuring the wrapping strength of the stranded wire
  • FIG. 6 is a graph showing the contact resistances measured of wrap joints of various types of wires
  • FIG. 7 is a graph showing the wrapping strengths measured of wrap joints of various types of wires.
  • FIG. 8 is a cross-sectional view showing another embodiment of the stranded wire.
  • the wrapping of the stranded wire can be achieved, using a wrapping tool of the type known in the art. Namely, first of all the stranded wire is stripped in a length necessary for-wrapping, by' removing an insulating sheath 11a, which in the art is called stripping operation. Then, the length of the exposed wire is inserted into a wire insertion slot provided in the wrapping tool and the terminal rod is received into a terminal insertion hole of said tool, and thereafter the wire is wrapped around the terminal rod.
  • a wrapping tool of the type known in the art. Namely, first of all the stranded wire is stripped in a length necessary for-wrapping, by' removing an insulating sheath 11a, which in the art is called stripping operation. Then, the length of the exposed wire is inserted into a wire insertion slot provided in the wrapping tool and the terminal rod is received into a terminal insertion hole of said tool
  • the direction of twist of the stranded wire 11 (the direction in which, when twisted, the individual wires are tightened, as viewed from the cut end face 11b of the stranded wire) is counterclockwise, whereas the direction in which the stranded wire is wrapped is clockwise.
  • reference numeral 24 indicates the direction of twist of the stranded wire
  • 22 indicates the direction in which the stranded wire is wrapped.
  • FIG. 2 shows only one pitch of the stranded wire which consists of seven individual wires twisted together.
  • the outer diameter of the resultant coil of wrapped conductor is larger than the inner diameter of the same, when looking axially of the terminal rod.
  • the conductor since the conductor is merely inserted into the slot of the wrapping tool and retained therein with freedom of rotation, the conductor turns as it is wrapped, so as to escape from being elongated and it is not the case that a fixed portion of the wire, located at the outer periphery of the coil is elongated incident to the wrapping operation.
  • the length 1 of the outer diameter and the length 1 of the inner'diameter of that portion of the stranded wire are in the relation of I 1 but considering the individual wires, the lengths thereof of the wrapped portion of the stranded wire are all the same. Namely, with the arrow 21 indicating the direction in which the wrapping proceeds and the arrow 22 indicating the direction in which the wrapping tool is rotated, the stranded wire 11 is wrapped while being twisted in the direction of arrow 23.
  • the method of this invention can be practiced more effectively, by the use of a stranded wire coated with a conductive material.
  • FIG. 3 shows a stranded wire 11 which is manufactured by a method comprising twisting seven bare wires 31 of the same diameter together in a counterclockwise direction at a predetermined pitch, coating the resultant strand with a conductive material 32 and then covering the same with an insulating sheath 11a.
  • a conductive material 32 solder, and tin, silver and alloys thereof are preferably used, but other metals and alloys may optionally be used.
  • the thickness of the coating is optional but need not be so large.
  • a stranded wire coated with a conductive material as described above is advantageous in that untwisting of the wire, resulting from the stripping or wrapping operation, can completely be avoided, in that the wrapping strength of the resultant wrap joint can be increased, and in that a workability and characteristic exactly the sameas in the case of a single-core wire can be obtained.
  • the stranded wire thus coated with a conductive material has such a secondary advantage that when it is used for soldered joint, the operation of twisting the wire end at the time of soldering can be eliminated and the operation of providing a priming solder can even be eliminated particularly when the wire is coated with solder or tin.
  • the wrapping strength was measured by abutting a load gauge 54 against the wrapped portion 53 of the wire around a terminal rod 52 extending from a base 51, as shown in FIG. 5, pushing the base 51 toward the load gauge 54 while holding said load gauge stationary, and reading the load, applied to the base, on the load gauge at the point when the wrapped portion 53 begins skid on the terminal rod.
  • FIGS. 6 and 7 respectively show the average values of contact resistance and wrapping strength of the individual wrap joints measured by the methods described above.
  • the contact resistance of each stranded wire according to the present invention is substantially equal to that of the conventional solid wire, indicating that the stranded wires of this invention do not have a particular problem in this respect, and the wrapping strengths of the stranded wires of this invention are not substantially inferior to that of the conventional solid wire, except for the wrapping strength of the uncoated stranded wire consisting of soft copper wires.
  • the value of wrapping strength of the uncoated stranded wire of soft copper is yet high enough for the practical use of said wire in an apparatus wherein the requirement for reliability and the conditions under which the stranded wire is used are not so severe, and further the value can readily be increased as by increasing the number of turns of the wrapped wire or by changing the shape of the terminal rod.
  • FIG. 8 An example of such stranded wires is shown in FIG. 8.
  • the stranded wire shown in FIG. 8 is composed of a core wire 81 which may be of such a diameter that the wire itself is not adapted to wrap joint, fine wires 82 wrapped around the core wire 81 and an insustranded wire a plurality of turns around a terminal rod in a direction opposite to the direction of twist thereof.
  • a method of establishing a wrap joint of a stranded wire according to claim 1 characterized in that said stranded wire is further provided with a coating of conductive material.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Non-Insulated Conductors (AREA)
US17050A 1969-03-12 1970-03-06 Method of establishing a warp joint of a stranded wire and stranded wires used therein Expired - Lifetime US3688811A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44018314A JPS4933832B1 (enrdf_load_stackoverflow) 1969-03-12 1969-03-12

Publications (1)

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US3688811A true US3688811A (en) 1972-09-05

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US17050A Expired - Lifetime US3688811A (en) 1969-03-12 1970-03-06 Method of establishing a warp joint of a stranded wire and stranded wires used therein

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US (1) US3688811A (enrdf_load_stackoverflow)
JP (1) JPS4933832B1 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5177583U (enrdf_load_stackoverflow) * 1974-12-17 1976-06-18
JPS5569910A (en) * 1979-10-11 1980-05-27 Sumitomo Electric Industries Method of manufacturing wire for connecting coil
US5283082A (en) * 1991-05-17 1994-02-01 Minnesota Mining And Manufacturing Company Method for applying solder to a braided shield of a cable
EP1076341A4 (en) * 1999-02-25 2001-11-28 Sumitomo Electric Industries INSULATED WIRE WITH WRAP TERMINAL AND WIRE CONNECTION METHOD
RU2186652C1 (ru) * 2001-08-01 2002-08-10 Землянушнова Надежда Юрьевна Способ изготовления многожильных витых пружин

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2132235A (en) * 1934-03-13 1938-10-04 Roeblings John A Sons Co Insulated electric conductor
US2439465A (en) * 1944-09-04 1948-04-13 United Shoe Machinery Corp Eyeleting machine
US2760731A (en) * 1951-12-28 1956-08-28 Bell Telephone Labor Inc Wire wrapping tool for stranded wire
US3237300A (en) * 1963-03-25 1966-03-01 Townsend Mary Dorothy Insulation cutting pliers having parallel longitudinal and transverse cutting edges
US3410078A (en) * 1964-04-27 1968-11-12 Synthetic Thread Company Inc Thread

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2132235A (en) * 1934-03-13 1938-10-04 Roeblings John A Sons Co Insulated electric conductor
US2439465A (en) * 1944-09-04 1948-04-13 United Shoe Machinery Corp Eyeleting machine
US2760731A (en) * 1951-12-28 1956-08-28 Bell Telephone Labor Inc Wire wrapping tool for stranded wire
US3237300A (en) * 1963-03-25 1966-03-01 Townsend Mary Dorothy Insulation cutting pliers having parallel longitudinal and transverse cutting edges
US3410078A (en) * 1964-04-27 1968-11-12 Synthetic Thread Company Inc Thread

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5177583U (enrdf_load_stackoverflow) * 1974-12-17 1976-06-18
JPS5569910A (en) * 1979-10-11 1980-05-27 Sumitomo Electric Industries Method of manufacturing wire for connecting coil
US5283082A (en) * 1991-05-17 1994-02-01 Minnesota Mining And Manufacturing Company Method for applying solder to a braided shield of a cable
EP1076341A4 (en) * 1999-02-25 2001-11-28 Sumitomo Electric Industries INSULATED WIRE WITH WRAP TERMINAL AND WIRE CONNECTION METHOD
RU2186652C1 (ru) * 2001-08-01 2002-08-10 Землянушнова Надежда Юрьевна Способ изготовления многожильных витых пружин

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Publication number Publication date
JPS4933832B1 (enrdf_load_stackoverflow) 1974-09-10

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