US2355477A - Form for windings and the like - Google Patents

Form for windings and the like Download PDF

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US2355477A
US2355477A US462075A US46207542A US2355477A US 2355477 A US2355477 A US 2355477A US 462075 A US462075 A US 462075A US 46207542 A US46207542 A US 46207542A US 2355477 A US2355477 A US 2355477A
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flanges
core
flange
spacing members
pair
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US462075A
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William F Stahl
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/04—Kinds or types
    • B65H75/08—Kinds or types of circular or polygonal cross-section
    • B65H75/14—Kinds or types of circular or polygonal cross-section with two end flanges
    • B65H75/146—Kinds or types of circular or polygonal cross-section with two end flanges with at least one intermediate flange between the two end flanges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/098—Mandrels; Formers

Definitions

  • This invention relates to a form for windings and the like, and more particularly to a bobbin or spool construction which is particularly adapted to be used as a form to receive electrical windings, such as coils.
  • a further object is to provide in a form for windings and the like, spacing members and flanges received on a tubular core, with the spacing members and flanges being equipped with interlocking means for preventing rotation of the flanges with respect to the spacing members.
  • FIG. 1 is a perspective view ofan embodiment of the invention
  • Fig. 2 is a perspective view of a spacing member used inthe invention
  • Fig. 3 is a front elevational view of one of the flanges
  • Fig. 4 is a collective view in section of the various parts used in assembling the device
  • Fig. 5 is a longitudinal sectional view of the device
  • Fig. 6 is a perspective view of a modified form of spacing member
  • Fig. 7 is a front elevational view of a, modified form of flange
  • Fig. 8 is a vertical sectional view of a form of the invention embodying the flanges and spacing members of Figs. 6 and 7.
  • the invention contemplates a simple and inexpensive construction for bobbins or the like for receiving electrical windings wherein a plurality of coils may be received on a single form and the coils separated by insulating material. At the same time, the form provides slots or grooves for receiving the electrical connections of each of the coils.
  • a tubular core III of laminated paper or other suitable material receives a plurality of centrally apertured flanges ll. Spacing members l2 are applied to the core betweencertain. 01' the flanges ll.
  • the core ill may be of any suitable construction, but is preferably formed oi laminated strips of paper helically wound in tubular form.
  • the core may be circular in cross section or may be polygonal or rectangular, if desired,
  • tubular is intended to include polygonal cross sectional shapes.
  • the flanges II are centrally apertured and are provided with tongues l3 extending radially inwardly from th periphery of the central aperture of the flang
  • the tongues 13 are preferably equidistantly spaced about the periphery of the central aperture and provide recesses H therebetween.
  • the flange ll may be equipped with a slot l5 which extends from the central portion of the flange to the outer periphery thereof.
  • the slot i5 is a straight slot which communicates at one end with the central aperture of the flange and at the other end extends through the outer periphery thereof.
  • the slot may be disposed at a slight angle with respect to a radial line of the circular flange.
  • the flange may be made of any suitable material, such as paper or composition material which is electrically insulating in character.
  • the spacing member I 2 is tubular in character and conforms in cross section construction to the tubular core ID.
  • the spacing member I2 may consist of laminated paper or other suitable material.
  • the inside diameter of the spacing member is only slightly greater than the outside diameter of the core ill so that the spacing member may be snugly received about the core l0.
  • the spacing member may be equipped with longitudinally-projecting tongues [6 which may be equidistantly spaced about the periphery of the spacing member I! providing recesses ll therebetween.
  • each spacing member is equipped with a pair of the longitudinally-projecting tongues which are disposed in diametrical opposition to each other at each end of the member.
  • the length of each of the tongues l6 may be approximately twice as great as the thickness of the flanges II.
  • each of the tongues I6 may be received within a recess .of a flange II and will extend through and engage two adjacent flanges.
  • Additional flanges i8 of a slightly dilferent construction may be used in the bobbin.
  • the flanges i8 may be of the conventional construction wherein a flange of insulating material is provided with a central aperture. If desired, the outwardly-extending slots may be omitted in the flanges l8.
  • the flanges I8 may be provided with the same radial tongues and recesses as the flanges H. Only two of the four recesses in the flanges l8, however, will be engaged
  • the bobbin or form for windings may be assembled by placing the flanges l8 and II and the spacing members i2 onthe core iii in the arrangement set forth in Fig. 4.
  • a flange l8 may be placed at one end of the core, and a flange H placed immediately adjacent the flange ii on the inner side thereof.
  • Three spacing members i2 may be placed on the core ill, with a pair of flanges ll being placed between each of the spacing members I2.
  • a flange II and a flange 18 may be then placed at the other end of the core.
  • the apertures in the flanges i8 and ii are such size that the flanges are snugly received on the core' Hi.
  • the ends of the radial tongues 13 snugly engage the outer surface of the core i0.
  • the spacing members i2 are snugly received on the core Hi.
  • the tongues II on each of the spacing members 12 are received in interlocking relation with the recesses II in each adjacent pair of flanges, the tongues I of each spacing member extending through a pair of adjacent flanges.
  • the spacing members may be arranged so that the adjacent tongues H of adjacent spacing members are disposed at angles of approximately 90 with respect to each other.
  • the tongues ll of the spacing member i 2 adjacent the end of the flange are received within the upper and lower recesses ll of the flanges ll, while the tongues I! oi the spacing member "disposed in the center of the bobbin are received within the side recesses 01' the flanges II.
  • This construction provides for a complete interlock throughout the device so that the spacing members and flanges are flxed in position with respect to each other.
  • the slots I! are so arranged in the flanges II that in the assembly 01' the bobbin or form, the slots of adjacent flanges II are out of register with each other. In this manner, a continuous insulating surface is provided between each of the spacing "members and between the coils which may be placed thereon.
  • the assembly is completed by outwardly swaging the ends is and 20 of the core iii to bring the outwardly-swaged ends into engagement with the flanges II at the ends of the core.
  • the flanges and spacing members are of such width that the outward swaging oi. the ends of the core causes the flanges and spacing members to be brought into tight engagement with each other.
  • , spacing members 22, and flanges 23 are the same as in the embodiment of Figs. 1 to 5, except that the spacing members 22 and flanges 23 are not provided with the interlocking tongues and recesses.
  • the flanges 23 and spacing members 22 are brought into tight frictional engagement, but may, under suflicient pressure, be rotated with respect to each other.
  • the flanges 22 are identical in construction and may be used at the ends of the core as well as in the intermediate portions thereof.
  • a form for windings and the like ing a tubular core, a plurality of centrally apertured flanges on said core with the core extending through and flttlng snugly within said apertures, a pair of said flanges being disposed at one end of the core, another pair of flanges being disposed at the other end of the core, and the remaining flanges being di posed at intermediate portions of the core, the flange of each of said end pair of flanges adjacent the central longitudinal portion of the core and each of the intermediate flanges being equipped with a slot therein extending from the central portion of the flange to the periphery thereof, and tubular spacing members of internal diameter only slightly greater than the external diameter of said core received on said core, one of said spacing members being adjacent each end of the core and 'engaging the slotted end flange, the other end of each of said spacing members engaging an intermediate flange, said core having outwardly swaged ends which engage the adjacent flanges and lock
  • a form for windings and the like comprising a laminated paper tubular core, at least three carried by said spacing members and flanges for securing the same in interlocking relation to prevent relative rotation thereof with respect to the axis of the core, said core having outwardly swaged ends which engage the flanges adjacent the ends of the core and lock the flanges and spacing members in engagement with each other.
  • a form for windings and the like comprising a laminated paper tubular core, a plurality of pairs of centrally apertured flanges received on said core with the core extending through and fitting snugly within said apertures, one of said pair of flanges being disposed at each end of the core and the other pairs of flanges being disposed at an intermediate portion thereof, the inner'flange of each pair of end flanges disposed adjacent the central longitudinal portion of the core and each of the intermediate flanges being provided with a slot extending from the central portion of the flange to the periphery thereof,
  • a form for windings and the like comprising a tubular core, an apertured flange on each end'of said core with the core extending through the apertures in each of the "flanges, a pair of apertured flanges received on said core with the core extending through the apertures in the flanges and the flanges being disposed together and in engagement with each other at an intermediate portion of the core, at least one of said pair of flanges being equipped with a slot extending from the central portion to the periphery thereof, said slot being disposed opposite a solid portion of the adjacent flange of said pair, and a pair of tubular spacing members of internal diameter only slightly greater than the external diameter of said core received on the core, each of said spacing members being disposed between an end flange and the pair of intermediate flanges, said core having swaged ends which engage the adjacent flanges and hold the flanges and spacing members in engagement with each other.
  • a form for windings and the like comprising a tubular core, an apertured flange 'on each being disposed together in engagement with each,
  • each of said pair of flanges being equipped with v a slot extending from the central portion to the periphery thereof, and a pair of tubular spacing members of internal diameter only slightly greater than the external diameter of said core end of said core with the core extending through the apertures in the flanges, a pair of apertured flanges on said core with the core extending through the aperture in each of the flanges and the flanges being disposed at an intermediate portion of the core in engagement with each other, at least one of said flanges being equipped with a slot extending from the central portion to the periphery thereof, said slot being disposed opposite a solid portion of the adjacent flange of said pair, a pair of tubular spacing members of internal diameter only slightly greater than the external 'diameter of said core received on the core, each of said spacing members being disposed between an end flange and said pair or intermediate flanges, said core having outwardly-' swaged ends each of which engages the adjacent flange and locks said
  • a tubular core In a form for windings and the like, a tubular core, a centrally apertured flang received on said core with the core extending through and litting snugly within said aperture, a pair of tubular spacing members of internal diameter only slightly greater than said core, one of said members being disposed on one sideof said flange and the other of said members being disposed on the other side of said flange, said flange containing at least two tongue-receiving recesses, said one member having a tongue extending into one of said recesses and the other of said members having a tongue extending into the other 01' said recesses, and means for holding said members against longitudinal displacement whereby said flange is locked against rotation about said core with respect to said members.

Description

Aug. 8, 1944. w. F. -STAHL FORM FOR WINDINGS AND THE LIKE Filed Oct. 15, 1942 Patented Aug. 8, 1944' UNITED STATES PATENT OFFICE 7 Claims.
This invention relates to a form for windings and the like, and more particularly to a bobbin or spool construction which is particularly adapted to be used as a form to receive electrical windings, such as coils.
An object of the invention is to provide a form for windings and the like wherein a plurality of flanges are disposed in spaced relation on a tubular core, with the flanges being flxed in longitudinal position by spacing members received on the core. Another object is to provide a plurality of flanges on a core and spacing members received on the core between certain flanges so that the flanges and spacing members are brought into tight engagement by the swaging of the core which fixes the flanges in position thereon.
Another object of the invention is to provide in a form for windings and the like wherein flanges are received on a tubular core, flanges equipped with slots for receiving electrical connections and the like. Yet another object is to provide in a form for windings and the like adapted to receive a plurality of coils, means for separating all of the coils by insulating material while at the same time providing slots or grooves for receiving electrical connections and the like. A further object is to provide in a form for windings and the like, spacing members and flanges received on a tubular core, with the spacing members and flanges being equipped with interlocking means for preventing rotation of the flanges with respect to the spacing members.
Other features and advantages will appear from the following specification and drawing, in Which Fig. 1 is a perspective view ofan embodiment of the invention; Fig. 2 is a perspective view of a spacing member used inthe invention; Fig. 3 is a front elevational view of one of the flanges; Fig. 4 is a collective view in section of the various parts used in assembling the device; Fig. 5 is a longitudinal sectional view of the device; Fig. 6 is a perspective view of a modified form of spacing member; Fig. 7 is a front elevational view of a, modified form of flange; and Fig. 8 is a vertical sectional view of a form of the invention embodying the flanges and spacing members of Figs. 6 and 7.
The invention contemplates a simple and inexpensive construction for bobbins or the like for receiving electrical windings wherein a plurality of coils may be received on a single form and the coils separated by insulating material. At the same time, the form provides slots or grooves for receiving the electrical connections of each of the coils.
In the embodiment of the invention shown in Figs. 1 to 5, a tubular core III of laminated paper or other suitable material receives a plurality of centrally apertured flanges ll. Spacing members l2 are applied to the core betweencertain. 01' the flanges ll.
The core ill may be of any suitable construction, but is preferably formed oi laminated strips of paper helically wound in tubular form. The core, of course, may be circular in cross section or may be polygonal or rectangular, if desired,
and the term "tubular is intended to include polygonal cross sectional shapes.
The flanges II are centrally apertured and are provided with tongues l3 extending radially inwardly from th periphery of the central aperture of the flang The tongues 13 are preferably equidistantly spaced about the periphery of the central aperture and provide recesses H therebetween. The flange ll may be equipped with a slot l5 which extends from the central portion of the flange to the outer periphery thereof. Preferably, the slot i5 is a straight slot which communicates at one end with the central aperture of the flange and at the other end extends through the outer periphery thereof. As shown, the slot may be disposed at a slight angle with respect to a radial line of the circular flange. The flange may be made of any suitable material, such as paper or composition material which is electrically insulating in character.
The spacing member I 2 is tubular in character and conforms in cross section construction to the tubular core ID. The spacing member I2 may consist of laminated paper or other suitable material. The inside diameter of the spacing member is only slightly greater than the outside diameter of the core ill so that the spacing member may be snugly received about the core l0. At its ends, the spacing member may be equipped with longitudinally-projecting tongues [6 which may be equidistantly spaced about the periphery of the spacing member I! providing recesses ll therebetween.
Preferably, each spacing member is equipped with a pair of the longitudinally-projecting tongues which are disposed in diametrical opposition to each other at each end of the member. The length of each of the tongues l6 may be approximately twice as great as the thickness of the flanges II. By reason of this construction, each of the tongues I6 may be received within a recess .of a flange II and will extend through and engage two adjacent flanges.
Additional flanges i8 of a slightly dilferent construction may be used in the bobbin. The flanges i8 may be of the conventional construction wherein a flange of insulating material is provided with a central aperture. If desired, the outwardly-extending slots may be omitted in the flanges l8. However, the flanges I8 may be provided with the same radial tongues and recesses as the flanges H. Only two of the four recesses in the flanges l8, however, will be engaged The bobbin or form for windings may be assembled by placing the flanges l8 and II and the spacing members i2 onthe core iii in the arrangement set forth in Fig. 4. A flange l8 may be placed at one end of the core, and a flange H placed immediately adjacent the flange ii on the inner side thereof. Three spacing members i2 may be placed on the core ill, with a pair of flanges ll being placed between each of the spacing members I2. A flange II and a flange 18 may be then placed at the other end of the core. f
The apertures in the flanges i8 and ii are such size that the flanges are snugly received on the core' Hi. In the case of the flanges H, the ends of the radial tongues 13 snugly engage the outer surface of the core i0. Similarly, the spacing members i2 are snugly received on the core Hi.
In the assembly of the device, the tongues II on each of the spacing members 12 are received in interlocking relation with the recesses II in each adjacent pair of flanges, the tongues I of each spacing member extending through a pair of adjacent flanges. The spacing members may be arranged so that the adjacent tongues H of adjacent spacing members are disposed at angles of approximately 90 with respect to each other. In this manner, the tongues ll of the spacing member i 2 adjacent the end of the flange are received within the upper and lower recesses ll of the flanges ll, while the tongues I! oi the spacing member "disposed in the center of the bobbin are received within the side recesses 01' the flanges II. This construction provides for a complete interlock throughout the device so that the spacing members and flanges are flxed in position with respect to each other. The slots I! are so arranged in the flanges II that in the assembly 01' the bobbin or form, the slots of adjacent flanges II are out of register with each other. In this manner, a continuous insulating surface is provided between each of the spacing "members and between the coils which may be placed thereon.
. The assembly is completed by outwardly swaging the ends is and 20 of the core iii to bring the outwardly-swaged ends into engagement with the flanges II at the ends of the core. The flanges and spacing members are of such width that the outward swaging oi. the ends of the core causes the flanges and spacing members to be brought into tight engagement with each other.
In the embodiment of the invention shown in Figs. 6, 7 and 8, the construction and arrangement of the core 2|, spacing members 22, and flanges 23 are the same as in the embodiment of Figs. 1 to 5, except that the spacing members 22 and flanges 23 are not provided with the interlocking tongues and recesses. When the assembly of this form of the invention is completed by outwardly swaging the ends 24 and 25 of the core 2|, the flanges 23 and spacing members 22 are brought into tight frictional engagement, but may, under suflicient pressure, be rotated with respect to each other. The flanges 22 are identical in construction and may be used at the ends of the core as well as in the intermediate portions thereof.
Although the invention has been described in connection with speciflc embodiments, it will be apparent thatthese embodiments have been described in detail for the purpose of illustration only.. Changes and modifications, therefore, may be readily made in the construction and arrangement of the device without departing from the spirit and scope of the invention.
I claim:
1. A form for windings and the like, ing a tubular core, a plurality of centrally apertured flanges on said core with the core extending through and flttlng snugly within said apertures, a pair of said flanges being disposed at one end of the core, another pair of flanges being disposed at the other end of the core, and the remaining flanges being di posed at intermediate portions of the core, the flange of each of said end pair of flanges adjacent the central longitudinal portion of the core and each of the intermediate flanges being equipped with a slot therein extending from the central portion of the flange to the periphery thereof, and tubular spacing members of internal diameter only slightly greater than the external diameter of said core received on said core, one of said spacing members being adjacent each end of the core and 'engaging the slotted end flange, the other end of each of said spacing members engaging an intermediate flange, said core having outwardly swaged ends which engage the adjacent flanges and lock the flanges and spacing members in engagement with each other.
2. A form for windings and the like, comprising a laminated paper tubular core, at least three carried by said spacing members and flanges for securing the same in interlocking relation to prevent relative rotation thereof with respect to the axis of the core, said core having outwardly swaged ends which engage the flanges adjacent the ends of the core and lock the flanges and spacing members in engagement with each other.
3. A form for windings and the like, comprising a laminated paper tubular core, a plurality of pairs of centrally apertured flanges received on said core with the core extending through and fitting snugly within said apertures, one of said pair of flanges being disposed at each end of the core and the other pairs of flanges being disposed at an intermediate portion thereof, the inner'flange of each pair of end flanges disposed adjacent the central longitudinal portion of the core and each of the intermediate flanges being provided with a slot extending from the central portion of the flange to the periphery thereof,
the slots in each pair of slotted flanges being out comprisswaged and engaging the end flanges to lock the same on the core and to maintain the flanges and spacing members in engagement with each other.
4. A form for windings and the like, comprising a tubular core, an apertured flange on each end'of said core with the core extending through the apertures in each of the "flanges, a pair of apertured flanges received on said core with the core extending through the apertures in the flanges and the flanges being disposed together and in engagement with each other at an intermediate portion of the core, at least one of said pair of flanges being equipped with a slot extending from the central portion to the periphery thereof, said slot being disposed opposite a solid portion of the adjacent flange of said pair, and a pair of tubular spacing members of internal diameter only slightly greater than the external diameter of said core received on the core, each of said spacing members being disposed between an end flange and the pair of intermediate flanges, said core having swaged ends which engage the adjacent flanges and hold the flanges and spacing members in engagement with each other.
5. A form for windings and the like, comprising a tubular core, an apertured flange 'on each being disposed together in engagement with each,
other at an intermediate portion of the core,
each of said pair of flanges being equipped with v a slot extending from the central portion to the periphery thereof, and a pair of tubular spacing members of internal diameter only slightly greater than the external diameter of said core end of said core with the core extending through the apertures in the flanges, a pair of apertured flanges on said core with the core extending through the aperture in each of the flanges and the flanges being disposed at an intermediate portion of the core in engagement with each other, at least one of said flanges being equipped with a slot extending from the central portion to the periphery thereof, said slot being disposed opposite a solid portion of the adjacent flange of said pair, a pair of tubular spacing members of internal diameter only slightly greater than the external 'diameter of said core received on the core, each of said spacing members being disposed between an end flange and said pair or intermediate flanges, said core having outwardly-' swaged ends each of which engages the adjacent flange and locks said flanges and spacing members in engagement with each other, and means carried by the spacing members and flanges for securing the same in interlocking relation to prereceived on the core, each of the spacing members being disposed between an end flange and the pair of intermediate flanges, said core having swaged ends which engage the adjacent flanges and hold the flanges and spacing members in engagement with each other, the intermediate flanges being rotatable with respect to each other about the core against the frictional engagement of said intermediate flanges with the core-and with the spacing members to bring said slots into and out of registry.
'7. In a form for windings and the like, a tubular core, a centrally apertured flang received on said core with the core extending through and litting snugly within said aperture, a pair of tubular spacing members of internal diameter only slightly greater than said core, one of said members being disposed on one sideof said flange and the other of said members being disposed on the other side of said flange, said flange containing at least two tongue-receiving recesses, said one member having a tongue extending into one of said recesses and the other of said members having a tongue extending into the other 01' said recesses, and means for holding said members against longitudinal displacement whereby said flange is locked against rotation about said core with respect to said members.
WILLIAM F. STAHL.
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Cited By (24)

* Cited by examiner, † Cited by third party
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US2604275A (en) * 1946-09-28 1952-07-22 Cons Eng Corp Resistor spool
US2762581A (en) * 1946-02-21 1956-09-11 Clayton A Washburn Coil form
US3131371A (en) * 1959-03-09 1964-04-28 Honeywell Regulator Co Winding form having means for protecting electrical coil leads
US3213397A (en) * 1961-04-28 1965-10-19 Gen Electric Electrical winding spool for electrical apparatus
US3307128A (en) * 1964-12-11 1967-02-28 Bel Tronics Corp Magnetic coil convergence assembly
US3743990A (en) * 1964-08-03 1973-07-03 Coilcraft Inc An inductor with mounting means
US3750073A (en) * 1971-07-29 1973-07-31 Tamura Seisakusho Kk Coil bobbin
US3947795A (en) * 1974-08-12 1976-03-30 Emerson Electric Co. Transformer winding means and methods
US4638282A (en) * 1985-07-18 1987-01-20 United Technologies Automotive, Inc. Wire cross-over arrangement for coil assembly
US4667132A (en) * 1986-03-03 1987-05-19 Dianalog Systems, Inc. Electronic transformer system for neon lamps
US4837544A (en) * 1977-05-13 1989-06-06 Mcdougal John A Spiral windings
US4862130A (en) * 1987-07-16 1989-08-29 United Technologies Automotive, Inc. Wire cross-over arrangement for angular coil assembly
US4916362A (en) * 1988-04-05 1990-04-10 Neon Dynamics Corporation Excitation supply for gas discharge tubes
US4980611A (en) * 1988-04-05 1990-12-25 Neon Dynamics Corporation Overvoltage shutdown circuit for excitation supply for gas discharge tubes
US5332989A (en) * 1992-08-17 1994-07-26 Ching Chiu S Horizontal compartmentized square bobbin of high-voltage transformer
US5359313A (en) * 1991-12-10 1994-10-25 Toko, Inc. Step-up transformer
US5710536A (en) * 1996-02-14 1998-01-20 Electronic De-Scaling 2000, Inc. Adaptive coil wrap apparatus
US6598824B2 (en) 2001-11-20 2003-07-29 Trombetta, Llc Electrical and mechanical coil system for dual and single action solenoids
US20140009251A1 (en) * 2012-07-03 2014-01-09 Chicony Power Technology Co., Ltd. Transformer having assembled bobbins and voltage transformation module having the transformer
EP2794447A4 (en) * 2011-12-22 2015-08-12 Foretrek Systems Pty Ltd Sleeve for a cable spool
US20160133379A1 (en) * 2014-11-06 2016-05-12 Delta Electronics, Inc. Magnetic element and bobbin assembly thereof
US9368266B2 (en) 2014-07-18 2016-06-14 Trumpet Holdings, Inc. Electric solenoid structure having elastomeric biasing member
US20160351311A1 (en) * 2014-02-06 2016-12-01 Hitachi, Ltd. Superconducting coil
US20170294266A1 (en) * 2014-09-02 2017-10-12 Koninklijke Philips N.V. Bobbin assembly and method for producing a bobbin assembly

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2762581A (en) * 1946-02-21 1956-09-11 Clayton A Washburn Coil form
US2604275A (en) * 1946-09-28 1952-07-22 Cons Eng Corp Resistor spool
US3131371A (en) * 1959-03-09 1964-04-28 Honeywell Regulator Co Winding form having means for protecting electrical coil leads
US3213397A (en) * 1961-04-28 1965-10-19 Gen Electric Electrical winding spool for electrical apparatus
US3743990A (en) * 1964-08-03 1973-07-03 Coilcraft Inc An inductor with mounting means
US3307128A (en) * 1964-12-11 1967-02-28 Bel Tronics Corp Magnetic coil convergence assembly
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