US2920351A - Method of making spring cords - Google Patents

Method of making spring cords Download PDF

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Publication number
US2920351A
US2920351A US681035A US68103557A US2920351A US 2920351 A US2920351 A US 2920351A US 681035 A US681035 A US 681035A US 68103557 A US68103557 A US 68103557A US 2920351 A US2920351 A US 2920351A
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US
United States
Prior art keywords
cord
convolutions
spring
mandrel
pitch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US681035A
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English (en)
Inventor
Edwin C Hardesty
Daryl L Myers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Western Electric Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE570721D priority Critical patent/BE570721A/xx
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to US681035A priority patent/US2920351A/en
Priority to GB26324/58A priority patent/GB865493A/en
Priority to DEW23936A priority patent/DE1125025B/de
Priority to JP2367258A priority patent/JPS3611174B1/ja
Priority to FR1209654D priority patent/FR1209654A/fr
Application granted granted Critical
Publication of US2920351A publication Critical patent/US2920351A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/008—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing extensible conductors or cables
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/40—Processes of coiling plastics

Definitions

  • This invention relates to a method of making spring cords, and more particularly spring cords of helically coiled form.
  • a further object of the invention is to produce a spring cord wherein no axial twist is placed in either the ndividual conductors or the iinal product prior to the reversal of the helical convolutions of the cord, at which time an added twist is given thereto to impart additional appear to be even and compact to assure that the convolutions therein are compact and of equal pitch and diameter.
  • Fig. l illustrates a cord after it is Wound initially on a mandrel in a helical coil
  • Fig. 2 illustrates an oven in which the helically wound cord of Fig. 1 is subjected to heat treatment
  • Fig. 3 illustrates the cord after heat treatment and removal from the mandrel
  • p Fig 4 illustrates a spring cord after reversal of the helices of the coil, as it is made currently
  • Fig. 5 illustrates a spring cord after reversal and with overtwist imparted thereto
  • Fig. 6 illustrates the spring cord of Fig. 5 with the overtwist substantially all removed.
  • one type of the improved spring cord consists of a plurality of insulated conductors having an insulating jacket thereover which is wound in helical form on a mandrel but to which is imparted no axial twist, after which it is heat treated on the mandrel in an oven to impart a set thereto.
  • the spring cord is then removed flom the mandrel, and the helices of the cord are reversed to impart an opposite pitch thereto and to introduce retractile forces within the cord, but during the reversal coiling operation the convolutions are overtwisted to an extent greater than necessary to form the coils to impart additional forces therein, and thereafter substantially all of the overtwist is removed or unwound from the helically coiled cord.
  • a method of forming the type of cord referred to above may include the steps of winding a conducting cord, consisting of a plurality of insulated conductors having an insulating jacket thereon, in a helical shape on a mandrel but to none of which is imparted an axial twist, and thereafter heat treating the cord to set the helical shape therein.
  • the cord may be removed from the mandrel and the pitch of the convolutions reversed to form a helical coil and to introduce retractile forces therein.
  • an overtwist is imparted to the coils, that is, the cord is twisted to an amount greater than necessary to form a series of coils therein to impart additional forces thereto.
  • substantially all of the overtwist is removed, thereby resulting in a finished' product having even-sized convolutions of equal pitch and compact with respect to each other.
  • a type of mandrel may consist of a center rod on which is provided a pair of adjustable stops, one of which is usually stationary to permit the mandrel to be inserted in the machine with which it is used.
  • the stationary stop is provided with a suitable catch to secure the forward end of the spring cord thereto.
  • the ksecond stop is secured to the rod adjacent to the terminal convolution.
  • the second stop is also provided with a catch to secure the trailing end of the cord.
  • a mandrel of this general type is disclosed more in detail in Patent 2,565,465, issued on August 28, 1951, to W. L. Ames.
  • the terminal portions of the cord 11 have not been illustrated in Fig. 1, but it should be understood that they may be plain severed ends or they may be tipped and banded, as shown in Fig. 3.
  • i 17 is further provided with bands 20 near tudinally with respect to the supply of cord. It has also been the general practice to rotate the supply of cord on an axis perpendicular to the line of advance of the cord toward the mandrel -to impart an axial twist theretorwhich sets up torsional strains in therco'rd.' After the, complete .helical coil is formed, the second stop is positioned and the trailing portion of the cord secured, as described The individual conductors may or may not have been axially twisted prior to the coiling and axial twisting of the jacketed conductor 11. Y Y
  • the jacketed cord such as 11, will-be coiled on a mandrel, such as 12, in a manner similar to that disclosed above, with the exception that no axial twist will be imparted either to the jack'eted cord or to the vindividual insulated conductors therein.
  • the cord may be connected to the stationary stop on the mandrel, and theV mandrel then may be rotated and moved longitudinally with respect to the supply of cord to form helical convolutions in the cord about the mandrel, but with no axial y,twist therein.
  • the conducting cord 11 After the conducting cord 11 is formed on the mandrel 12, it is placed on a rack 13 which, when filled, is placed within a heat treat oven 14.
  • the oven may be heated by any suitable and conventional means, such as electrical coils 16.
  • the cord 11 within the oven 14 ⁇ will be heated toa suitable'temperature for a suitabletime in order that the cloiling strains in the insulation are relieved to the amount that thev insulation takes on a permanent set and retains its helical shape.
  • FIG. 3 illustrates a partially finished springcord, de'sig- Ynated generally by the numeral 17, which has beenY removed from the mandrel 12 after heat treatment.
  • the cord 17 is formed with individual -insulated conductors 18 which have electrical connect- ⁇ ing -tips 19 secured to the extremity thereof. The cord thefextremities thereof to secure the insulated jacket-at a point near which it ends and from which the conductors 1S extend.
  • a reversal of the pitch of the convolutions may be done in various ways.
  • One method of reversal of pitch is to engage one'end of the heat treated helical coil and to draw it lthrough the coil helix, which results in a cord having the pitch ofthe lhelices reversed. This method is illustrated in Patent No. 2,271,057, issued to W. T. Barrans on January 27, 1942.
  • a cord with rsubstantially all of the overtwist removed is-illustrated by a spring cord designated generally by the numeral 23 in Fig. 6. It may be noted by examining this illustration that the pitch of individual convolutions is theV same, that the convolutions are compact with respect to each other, and that the diameter of all vof the convolutions is substantially the same. Further,
  • th'epspring'cord may be made having 3, v4, 5 lor 6 separate insulated conductors therein over which there is a 'commoninsulating jacket.
  • the 'spring cords are usually made in lengths of4 l ⁇ ef ⁇ :t,'51/2 ⁇ feet,9 feetor 13 feet.
  • the amount of overtwist and removal of overtwistV will depend on the'particular type of spring cord which is being made at any one time. In order to determine the proper amount of overtwist and removal of overtwist, it will be necessary, depending on the type of machine utilized for performing those operations, to adjust it to give the proper number of overtwists and twist removals to provide a cord of maximum etciency and utility.
  • the provement which comprises applying tension to the cord to hold the cord extended, and twisting the reversed cord to impart additional convolutions of the reversed direction thereto so that all of the convolutions are reduced in diameter and strains induced in the various components of the cord during the formation and reversal thereof are distributed substantially uniformly throughout the cord, whereby the convolutions remaining in the cord, when the cord is unrestrained, are of substantially uniform pitch, diameter and spacing.
  • a spring cord which includes the steps of forming a straight length of a cord having an elastic jacket into a helical form, heat treating the thus-formed cord to set the cord in said helical form and then completely reversing the direction of the convolutions of the helically formed cord to enhance the retractibility thereof, the improvement which comprises applying tension to the cord to hold the cord extended, and twisting the reversed cord in a direction such as to impart additional convolutions ofthe reversed direction thereto so that all of the convolutions are reduced in diameter and strains induced in the various components of the cord during the formation and reversal thereof are distributed substantially uniformly throughout the cord, and then untwisting the cord by an amount suflicient to remove said additional convolutions, whereby the convolutions remaining in the cord when the cord is unrestrained are of substantially uniform pitch, diameter and spacing.
  • a spring cord which includes the steps of forming a straight length of a cord having an elastic jacket into a tight helical form on a mandrel of a predetermined uniform diameter, heat treating the thus-formed cord to set the cord in said helical form, removing the helically formed cord from the mandrel and subsequently completely reversing the direction of the convolutions of the helically formed cord to enhance the retractibility thereof, the improvement which comprises applying longitudinal tic jacket and set in a helicallyI coiled form, which method comprises extending the coiled cord longitudinally, gripping the opposite ends of the coiled cord, twistingly rotating one end relative to the other on its own axis and in the same direction as the pitch of the helix while maintaining the coiled cord extended until the direction of all of the coils is reversed and the cord is recoiled in the opposite helical direction, and continuing the rotating step until additional convolutions of the reverse direction are imparted to the recoiled cord so that all of the

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
US681035A 1957-08-29 1957-08-29 Method of making spring cords Expired - Lifetime US2920351A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE570721D BE570721A (en)) 1957-08-29
US681035A US2920351A (en) 1957-08-29 1957-08-29 Method of making spring cords
GB26324/58A GB865493A (en) 1957-08-29 1958-08-15 Improvements in or relating to spring electrical cords and methods of making them
DEW23936A DE1125025B (de) 1957-08-29 1958-08-19 Verfahren zur Herstellung einer dehnbaren elektrischen Leitungsschnur
JP2367258A JPS3611174B1 (en)) 1957-08-29 1958-08-21
FR1209654D FR1209654A (fr) 1957-08-29 1958-08-25 Câbles élastiques et leur procédé de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US681035A US2920351A (en) 1957-08-29 1957-08-29 Method of making spring cords

Publications (1)

Publication Number Publication Date
US2920351A true US2920351A (en) 1960-01-12

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ID=24733529

Family Applications (1)

Application Number Title Priority Date Filing Date
US681035A Expired - Lifetime US2920351A (en) 1957-08-29 1957-08-29 Method of making spring cords

Country Status (6)

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US (1) US2920351A (en))
JP (1) JPS3611174B1 (en))
BE (1) BE570721A (en))
DE (1) DE1125025B (en))
FR (1) FR1209654A (en))
GB (1) GB865493A (en))

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076244A (en) * 1958-08-20 1963-02-05 Velcro Sa Soulie Device for connecting two flexible parts
US3087199A (en) * 1959-12-23 1963-04-30 Western Electric Co Method of and apparatus for reversing spring cords
US3117344A (en) * 1961-12-15 1964-01-14 Carmer Ind Inc Mold for making plastic coil with straight leads
US3128518A (en) * 1958-08-07 1964-04-14 Wahl Brothers Zipper
US3184795A (en) * 1962-04-20 1965-05-25 Jr Alieyne C Howell Continuous coil winding apparatus
US3207827A (en) * 1961-01-09 1965-09-21 Itek Corp Method of making helical article
US3226767A (en) * 1961-05-16 1966-01-04 Whitney Blake Co Apparatus for wire coiling
US4313645A (en) * 1980-05-13 1982-02-02 Western Electric Company, Inc. Telephone cord having braided outer jacket
US4339298A (en) * 1981-01-29 1982-07-13 Western Electric Company, Inc. Apparatus for insulating relatively flexible conductors
USRE31197E (en) * 1980-05-13 1983-04-05 Western Electric Company, Inc. Telephone cord having braided outer jacket
US4425292A (en) 1981-09-29 1984-01-10 Western Electric Company, Inc. Hybrid extrusion methods
US4493747A (en) * 1982-01-27 1985-01-15 At&T Technologies, Inc. Method for insulating conductors with a crystalline plastic material
US4516922A (en) * 1981-09-29 1985-05-14 At&T Technologies, Inc. Hybrid apparatus for insulating conductors
US4551185A (en) * 1983-02-15 1985-11-05 At&T Technologies, Inc. Methods of and apparatus for making retractile cords
US20060032038A1 (en) * 2004-08-13 2006-02-16 Burkle Marie L Phosphorescent power conducting device
USD547143S1 (en) 2005-12-07 2007-07-24 Black & Decker Inc. String trimmer
USD548029S1 (en) 2005-12-07 2007-08-07 Black & Decker Inc. String trimmer

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1640772B1 (de) * 1968-03-09 1971-03-11 Kabel Metallwerke Ghh Verfahren zum kontinuierlichen Herstellen einer dehnbaren,schraubenfoermig gewundenen elektrischen Leitung
BE758127A (fr) * 1969-12-23 1971-04-01 Kabel Metallwerke Ghh Cordon electrique extensible, enroule helicoidalement
DE2517384C3 (de) * 1975-04-19 1981-08-20 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zum Beschichten der Innenfläche eines Rundhohlleiters

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2173096A (en) * 1937-12-18 1939-09-19 Ralph D Collins Extensible cord
US2248149A (en) * 1939-10-27 1941-07-08 Ralph D Collins Winding device
US2271057A (en) * 1939-05-12 1942-01-27 Western Electric Co Retractile conductor cord and method of making such a cord
US2478861A (en) * 1945-09-06 1949-08-09 Collins Method of reversing elastic coil structures

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE899961C (de) * 1937-03-26 1953-12-17 Albert Werner Hollenweger Verfahren und Vorrichtung zur Herstellung von leitenden dehnbaren Schnueren in Spiralform
CH279746A (de) * 1949-12-13 1951-12-15 Werner Hollenweger Albert Verfahren zur Herstellung dehnbarer elektrischer Leitungsschnüre, welche mindestens zum Teil die Gestalt einer schraubenlinienförmigen Wendel aufweisen.
US2635292A (en) * 1950-07-12 1953-04-21 Western Electric Co Method of removing spirally wound articles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2173096A (en) * 1937-12-18 1939-09-19 Ralph D Collins Extensible cord
US2271057A (en) * 1939-05-12 1942-01-27 Western Electric Co Retractile conductor cord and method of making such a cord
US2248149A (en) * 1939-10-27 1941-07-08 Ralph D Collins Winding device
US2478861A (en) * 1945-09-06 1949-08-09 Collins Method of reversing elastic coil structures

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3128518A (en) * 1958-08-07 1964-04-14 Wahl Brothers Zipper
US3076244A (en) * 1958-08-20 1963-02-05 Velcro Sa Soulie Device for connecting two flexible parts
US3087199A (en) * 1959-12-23 1963-04-30 Western Electric Co Method of and apparatus for reversing spring cords
US3207827A (en) * 1961-01-09 1965-09-21 Itek Corp Method of making helical article
US3226767A (en) * 1961-05-16 1966-01-04 Whitney Blake Co Apparatus for wire coiling
US3117344A (en) * 1961-12-15 1964-01-14 Carmer Ind Inc Mold for making plastic coil with straight leads
US3184795A (en) * 1962-04-20 1965-05-25 Jr Alieyne C Howell Continuous coil winding apparatus
USRE31197E (en) * 1980-05-13 1983-04-05 Western Electric Company, Inc. Telephone cord having braided outer jacket
US4313645A (en) * 1980-05-13 1982-02-02 Western Electric Company, Inc. Telephone cord having braided outer jacket
US4339298A (en) * 1981-01-29 1982-07-13 Western Electric Company, Inc. Apparatus for insulating relatively flexible conductors
US4425292A (en) 1981-09-29 1984-01-10 Western Electric Company, Inc. Hybrid extrusion methods
US4516922A (en) * 1981-09-29 1985-05-14 At&T Technologies, Inc. Hybrid apparatus for insulating conductors
US4493747A (en) * 1982-01-27 1985-01-15 At&T Technologies, Inc. Method for insulating conductors with a crystalline plastic material
US4551185A (en) * 1983-02-15 1985-11-05 At&T Technologies, Inc. Methods of and apparatus for making retractile cords
US20060032038A1 (en) * 2004-08-13 2006-02-16 Burkle Marie L Phosphorescent power conducting device
WO2006020804A3 (en) * 2004-08-13 2006-05-18 Autac Inc A method of making a phosphorescent power conducting device
USD547143S1 (en) 2005-12-07 2007-07-24 Black & Decker Inc. String trimmer
USD548029S1 (en) 2005-12-07 2007-08-07 Black & Decker Inc. String trimmer

Also Published As

Publication number Publication date
BE570721A (en))
JPS3611174B1 (en)) 1961-07-21
GB865493A (en) 1961-04-19
FR1209654A (fr) 1960-03-03
DE1125025B (de) 1962-03-08

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