US1944508A - Method of making electrically insulating form pieces - Google Patents

Method of making electrically insulating form pieces Download PDF

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Publication number
US1944508A
US1944508A US534603A US53460331A US1944508A US 1944508 A US1944508 A US 1944508A US 534603 A US534603 A US 534603A US 53460331 A US53460331 A US 53460331A US 1944508 A US1944508 A US 1944508A
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United States
Prior art keywords
annular
mandrel
insulating
matrix
electrically insulating
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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
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US534603A
Inventor
Gubler Ulrich
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Micafil AG
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Micafil AG
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Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/60—Winding and joining, e.g. winding spirally helically using internal forming surfaces, e.g. mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
    • B29C69/002—Winding
    • B29C69/003—Winding and cutting longitudinally, e.g. for making O-rings; chain links, insulation tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/541—Positioning reinforcements in a mould, e.g. using clamping means for the reinforcement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • 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
    • H01F41/12—Insulating of windings
    • H01F41/125—Other insulating structures; Insulating between coil and core, between different winding sections, around the coil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3412—Insulators
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1043—Subsequent to assembly
    • Y10T156/1049—Folding only

Definitions

  • This invention relates to a new method of manufacturing electrical insulating form pieces with an open profile cross-section of uniform thickness and consists in this, that in the first 5 place band-shaped insulating material (for example paper strip) is wound helically on a mandrel, the mandrel thereupon removed and finally the insulating body pressed to the desired shape.
  • band-shaped insulating material for example paper strip
  • This method is particularly suitable when the paper strip is wound on a mandrel in theform of a straight bar, so that, after the mandrel has been withdrawn in the axial direction, a tubular insulating body remains, which is thereupon pressed to'a straight bar of T-shaped or other cross-section.
  • Fig. l a is an annular mandrel of rectangular cross section, around which a paper strip b is Wound in such a manner that in the first place a paper ring 0 is formed.
  • the paper strip b unwinds from the spool d which together with its supporting ring revolves around the wrapping place, while at the same time the winding mandrel a is rotated horizontally for providing the requisite forward feed.
  • the paper ring 0 When the paper ring 0 is finished, it is taken together with'its mandrel a out of the ring 1, which is arranged to hinge open (not shown), and is placed on the annular matrix 9 (Fig. 2) of a pressing device.
  • the paper ring c is thereupon cut open. at it along a circular line, the edges of the cut are bent away on either side and the mandrel a is removed (Fig. 3).
  • the annular matrix 1 (Fig. 4) is then placed over the paper ring c and the latter pressed to the required shape (for instance an angle or U).
  • the further treatment of the ring 0 may be carried out, in a known manner, in press moulds consisting of a plurality of parts by pressing them together for instance by means of screw bolts or in a hydraulic press, in the cold or warm state.
  • the hand-shaped insulating material may also be wound on the mandrel in such a manner that adjacent winding layers overlap one another crosswise, so as to. increase the strength of the wound blank. It is also possible to use an insulating band which has been coated or saturated with varnish or resin and to bake the form piece after pressing.
  • the form piecemade in this manner may be used for a great variety of purposes, for instance as protective caps for high tension windings of transformers. They have the advantage that they are not only reliable in operation but are also cheap, as their manufacture takes relatively little time.
  • annular insulating members which comprises winding a strip of insulating fabric upon an annular mandrel to form a toroidal tube, cutting open the tube along one side thereof to form an annular blank, placing said annular blank upon a matrix, and subjecting said annular blank to a shaping operation while on the matrix.
  • annular insulating members which comprises winding a strip of insulating fabric in several layers of different pitch upon an annular mandrel to form a toroidal tube, cutting open the tube along one side thereof to form an annular blank, and subjecting said annular blank to a shaping operation.
  • annular insulating members which comprises winding a strip of fabric impregnated with insulating material upon an annular mandrel to form a toroidal tube, cutting open the tube along one side, thereof to form an annular blank, placing said annular blank upon a matrix, and subjecting said annular blank to a shaping operation while on the matrix.
  • annular insulating members which comprises winding a strip of insulating fabric upon an annular mandrel to form a toroidal tube, cutting open the tube along one side thereof to form an annular blank, placing said annular blank upon a matrix, and subjecting said annular blank to shaping by the application of heat and pressure while on the matrix.
  • annular insulating members which comprises Winding a strip of insulating fabric upon an annular mandrel to form a toroidal tube, placing the tube and mandrel upon a matrix, cutting the tube along one wall, and subjecting said out material to a shaping operation while on the matrix.

Description

u. GUB LER 1,944,508
METHOD OF MAKING ELECTRICALLY INSULATING FORM PIECES Jan. 23, 1934.
Filed May 2, 1931 Fig. 3
Fig. 2
Fig.4
By C
k w m Fax 0 M L h 2 .H m
Patented Jan. 23, 1934 UNITED STATES PATENT OFFICE METHOD OF MAKING ELECTRICALLY INSU- LATING FORM PIECES Switzerland Application May 2, 1931, Serial No. 534,603, and in Germany May 5, 1930 Claims.
This invention relates to a new method of manufacturing electrical insulating form pieces with an open profile cross-section of uniform thickness and consists in this, that in the first 5 place band-shaped insulating material (for example paper strip) is wound helically on a mandrel, the mandrel thereupon removed and finally the insulating body pressed to the desired shape. This method is particularly suitable when the paper strip is wound on a mandrel in theform of a straight bar, so that, after the mandrel has been withdrawn in the axial direction, a tubular insulating body remains, which is thereupon pressed to'a straight bar of T-shaped or other cross-section. When, however, annular form pieces for instance are to be made, it is advisable to wind the paper strip on to an annular mandrel, thereupon to place both into the matrix of a pressing device, then to cut open the paper body and to bend open the cut ends, after which the mandrel can be removed and the paper ring pressed to form an annular piece of any desired cross-section.
In the accompanying drawing the stages of manufacture of a form piece made according to the new method are illustrated. Of the means used for carrying out the method only those are indicated, which are necessary for understanding the essential features of the invention. In Fig. l a is an annular mandrel of rectangular cross section, around which a paper strip b is Wound in such a manner that in the first place a paper ring 0 is formed. The paper strip b unwinds from the spool d which together with its supporting ring revolves around the wrapping place, while at the same time the winding mandrel a is rotated horizontally for providing the requisite forward feed. When the paper ring 0 is finished, it is taken together with'its mandrel a out of the ring 1, which is arranged to hinge open (not shown), and is placed on the annular matrix 9 (Fig. 2) of a pressing device. The paper ring c is thereupon cut open. at it along a circular line, the edges of the cut are bent away on either side and the mandrel a is removed (Fig. 3). The annular matrix 1 (Fig. 4) is then placed over the paper ring c and the latter pressed to the required shape (for instance an angle or U). The further treatment of the ring 0 may be carried out, in a known manner, in press moulds consisting of a plurality of parts by pressing them together for instance by means of screw bolts or in a hydraulic press, in the cold or warm state. The hand-shaped insulating material may also be wound on the mandrel in such a manner that adjacent winding layers overlap one another crosswise, so as to. increase the strength of the wound blank. It is also possible to use an insulating band which has been coated or saturated with varnish or resin and to bake the form piece after pressing.
The form piecemade in this manner may be used for a great variety of purposes, for instance as protective caps for high tension windings of transformers. They have the advantage that they are not only reliable in operation but are also cheap, as their manufacture takes relatively little time.
The invention claimed is:
. 1. The method of forming annular insulating members which comprises winding a strip of insulating fabric upon an annular mandrel to form a toroidal tube, cutting open the tube along one side thereof to form an annular blank, placing said annular blank upon a matrix, and subjecting said annular blank to a shaping operation while on the matrix.
2. The method of forming annular insulating members which comprises winding a strip of insulating fabric in several layers of different pitch upon an annular mandrel to form a toroidal tube, cutting open the tube along one side thereof to form an annular blank, and subjecting said annular blank to a shaping operation.
3. The method of forming annular insulating members which comprises winding a strip of fabric impregnated with insulating material upon an annular mandrel to form a toroidal tube, cutting open the tube along one side, thereof to form an annular blank, placing said annular blank upon a matrix, and subjecting said annular blank to a shaping operation while on the matrix.
' e. The method of forming annular insulating members which comprises winding a strip of insulating fabric upon an annular mandrel to form a toroidal tube, cutting open the tube along one side thereof to form an annular blank, placing said annular blank upon a matrix, and subjecting said annular blank to shaping by the application of heat and pressure while on the matrix.
5. The method of forming annular insulating members which comprises Winding a strip of insulating fabric upon an annular mandrel to form a toroidal tube, placing the tube and mandrel upon a matrix, cutting the tube along one wall, and subjecting said out material to a shaping operation while on the matrix.
ULRICH GUBLER.
US534603A 1930-05-05 1931-05-02 Method of making electrically insulating form pieces Expired - Lifetime US1944508A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE364984X 1930-05-05

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473248A (en) * 1944-12-01 1949-06-14 Gen Electric Commutator cone insulator and method of making the same
US2482527A (en) * 1944-06-09 1949-09-20 Westinghouse Electric Corp Insulation
US2754355A (en) * 1952-02-08 1956-07-10 Allis Chalmers Mfg Co Crepe paper insulating elements
US2841636A (en) * 1953-09-24 1958-07-01 Glastic Corp Electric insulator and method of making same
EP3142233A1 (en) * 2015-09-10 2017-03-15 Von Roll Schweiz AG Method for producing a form coil for an electric machine by means of flat wire

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2482527A (en) * 1944-06-09 1949-09-20 Westinghouse Electric Corp Insulation
US2473248A (en) * 1944-12-01 1949-06-14 Gen Electric Commutator cone insulator and method of making the same
US2754355A (en) * 1952-02-08 1956-07-10 Allis Chalmers Mfg Co Crepe paper insulating elements
US2841636A (en) * 1953-09-24 1958-07-01 Glastic Corp Electric insulator and method of making same
EP3142233A1 (en) * 2015-09-10 2017-03-15 Von Roll Schweiz AG Method for producing a form coil for an electric machine by means of flat wire
WO2017042013A1 (en) * 2015-09-10 2017-03-16 Von Roll Schweiz Ag Method for producing a shaped coil for an electrical machine using flat wire

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Publication number Publication date
GB364984A (en) 1932-01-14

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