US3902241A - Method of manufacturing pressed material commutators - Google Patents

Method of manufacturing pressed material commutators Download PDF

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Publication number
US3902241A
US3902241A US476517A US47651774A US3902241A US 3902241 A US3902241 A US 3902241A US 476517 A US476517 A US 476517A US 47651774 A US47651774 A US 47651774A US 3902241 A US3902241 A US 3902241A
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US
United States
Prior art keywords
metal body
commutator
commutators
cooling
pressed material
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
US476517A
Other languages
English (en)
Inventor
Lothar Worner
Heinz Gerlach
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.)
Krautt & Bux A G Fa
Krautt & Bux AG Firma
Original Assignee
Krautt & Bux A G Fa
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
Application filed by Krautt & Bux A G Fa filed Critical Krautt & Bux A G Fa
Application granted granted Critical
Publication of US3902241A publication Critical patent/US3902241A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01R43/06—Manufacture of commutators
    • H01R43/08—Manufacture of commutators in which segments are not separated until after assembly
    • 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
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49011—Commutator or slip ring assembly
    • 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
    • Y10T29/49799—Providing transitory integral holding or handling portion
    • 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
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material

Definitions

  • ABSTRACT A method of manufacturing pressed material commutators comprising a hollow cylindrical shaped metal body, which is provided with a number of axial oriented groups of inwardly projecting anchoring elements, the number corresponding to a predetermined number of commutator segments, whereby the metal body is pressed in a press mold with a pressed material into a commutator blank and later is divided into individual laminae, characterized in that the division of the metal body of the commutator blank is performed before the cooling of the same.
  • the present invention relatesto a method of producing pressed material commutators, in general, and molded plastic commutators, in particular, comprising a hollow cylindrically shaped metal body, which is equipped with anumber, corresponding to the number of commutatorsegments, of axially aligned groups of inwardly projecting anchoring elements, whereby the metal body is pressed or molded in a press or compression mold with an insulating material to produce a commutator blank, being preferably molded from a known plastic composition, and which blank is later divided into theindividual laminae or plates.
  • Small commutators are frequently composed not of individual laminae, but rather of a hollow cylindrically shaped metal body, which is equipped with a number, corresponding to the number of commutator segments, of axially aligned groups of inwardly projecting anchoring elements.
  • These metal bodies are made either from profiled copper tube, which for example has been profiled in an extrusionand drawing-process and from which the individual metal bodies are separated in corresponding appropriate lengths, or they are made from a profiled band or strip, which has been profiled from a preliminarily shaped band or from stock material by rolling by rollers, and from which, sections corresponding respectively to the peripheral length of the commutator, are cut, separated and rolled into the hollow cylindrically shaped metal bodies.
  • the last mentioned method is more economical, since the section of the metal body, which has the twisted hooks, can be manufactured with a conservation of material with the rollers by means of a corresponding displacement of material during rolling, whereas with the use of a profiled copper tube, it must be produced from a corresponding longitudinal section of this tube by a cutting removal of material.
  • the hollow cylindrically shaped metal bodies are heated and pressed or filled under pressure, in a press or compression mold with a heated insulating material customary therefor, into a commutator blank, which as a rule already has the receiving bore.
  • the annular shaped metal body is divided into the individual laminae by sawing between the longitudinal ribs with the anchoring elements, i.e., between the groups of the anchoring elements.
  • the contraction of the insulating mate rial body is larger than that of the metal body.
  • the insulating material body loosens or releases itself somewhat from the metal body, so that after the division of the metal body into the individual laminae, these no longer are rigidly anchored in the insulating material body.
  • an adhesive insulating material By the use of an adhesive insulating material, the danger of the loosening of the laminae is reduced, however instead there occurs in the insulating body a formation of cracks originating from the bore side of the commutator. Both occurences influence the strength, solidity and durability of the finished commutator to a considerable degree.
  • This object and task is solved by the present invention by a method with the aforementioned method steps, in which the division of the metal body of the commutator is performed before the cooling of the insulating material thereof. Accordingly, there is no longer present, during the cooling of the commutator, a metal body closed in the circumferential direction, so that, of the individual laminae which are now separated from one another, the contraction or shrinkage in the radial direction occurring during the cooling of the insulating material body can follow without any further consequences. In this manner, the loosening of the laminae and the occurrence of cracks in the insulating material body characteristic of the prior art are avoided.
  • a further object of the present invention is to provide a method of manufacturing pressed material commutators comprising a hollow cylindrically shaped metal body, which is provided with a number of axially oriented groups of inwardly projecting anchoring elements, the number corresponding to a predetermined number of commutator segments, whereby the metal body is pressed in a press mold with a pressed material into a commutator blank and later is divided into individual laminae, and characterized by the step of performing the division of the metal body of the commutator blank prior to significant cooling of the pressed material.
  • the method in accordance with the present invention likewise is of advantage, since a loosening between the laminae and the insulating material body and/or a formation of cracks in the insulating material body neither occurs nor develops, which otherwise, during tempering or annealing of the entire commutator, could worsen.
  • FIGURE is a partly sectioned perspective view of a finished commutator in accordance with the present invention.
  • the hollow cylindrical metal body 2 is divided into a plurality of laminae or plates 2a prior to the cooling of the same.
  • Each laminae is formed with a plurality of axially oriented anchoring elements 3, whereby each of the individual laminae 2a is anchored in the insulating body 4 which has a central receiving bore 5.
  • a method of manufacturing pressed material commutators comprising a hollow cylindrically shaped metal body, which is provided with a number of axially oriented groups of inwardly projecting anchoring elements, said number corresponding to a predetermined number of commutator segments, comprising the steps of:

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US476517A 1973-06-06 1974-06-05 Method of manufacturing pressed material commutators Expired - Lifetime US3902241A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2328753A DE2328753A1 (de) 1973-06-06 1973-06-06 Verfahren zum herstellen von pressstoffkollektoren

Publications (1)

Publication Number Publication Date
US3902241A true US3902241A (en) 1975-09-02

Family

ID=5883182

Family Applications (1)

Application Number Title Priority Date Filing Date
US476517A Expired - Lifetime US3902241A (en) 1973-06-06 1974-06-05 Method of manufacturing pressed material commutators

Country Status (6)

Country Link
US (1) US3902241A (sv)
JP (1) JPS5027905A (sv)
DE (1) DE2328753A1 (sv)
FR (1) FR2232850B1 (sv)
GB (1) GB1433987A (sv)
SE (1) SE391843B (sv)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031615A (en) * 1975-07-17 1977-06-28 Societe Des Electrodes Et Refractaires Savoie Method of making cathodes
EP0007186A1 (en) * 1978-07-07 1980-01-23 Qualtex Industries Limited Methods of manufacturing commutators, and a commutator manufactured by such methods
US4791328A (en) * 1985-12-06 1988-12-13 Fasco Industries, Inc. Multi-piece rotor for dynamoelectric machine
US5126184A (en) * 1989-12-27 1992-06-30 Citizen Watch Co., Ltd. Molded part and mold for manufacturing the same
US20050022367A1 (en) * 2003-07-29 2005-02-03 Lee Cheon-Mu Method of fabricating a commutator for a motor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1993966A (en) * 1933-11-01 1935-03-12 Bessie D Apple Method of making commutators
US2188423A (en) * 1938-07-09 1940-01-30 George E Andrews Method of making a commutator
US2400590A (en) * 1944-05-18 1946-05-21 E A Lab Inc Method of making commutators
US2963774A (en) * 1956-09-17 1960-12-13 Dayton Prec Mfg Company Manufacture of commutators having molded cores

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1993966A (en) * 1933-11-01 1935-03-12 Bessie D Apple Method of making commutators
US2188423A (en) * 1938-07-09 1940-01-30 George E Andrews Method of making a commutator
US2400590A (en) * 1944-05-18 1946-05-21 E A Lab Inc Method of making commutators
US2963774A (en) * 1956-09-17 1960-12-13 Dayton Prec Mfg Company Manufacture of commutators having molded cores

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031615A (en) * 1975-07-17 1977-06-28 Societe Des Electrodes Et Refractaires Savoie Method of making cathodes
EP0007186A1 (en) * 1978-07-07 1980-01-23 Qualtex Industries Limited Methods of manufacturing commutators, and a commutator manufactured by such methods
US4791328A (en) * 1985-12-06 1988-12-13 Fasco Industries, Inc. Multi-piece rotor for dynamoelectric machine
US5126184A (en) * 1989-12-27 1992-06-30 Citizen Watch Co., Ltd. Molded part and mold for manufacturing the same
US20050022367A1 (en) * 2003-07-29 2005-02-03 Lee Cheon-Mu Method of fabricating a commutator for a motor

Also Published As

Publication number Publication date
FR2232850B1 (sv) 1977-10-07
JPS5027905A (sv) 1975-03-22
SE7407380L (sv) 1974-12-09
DE2328753A1 (de) 1974-12-19
SE391843B (sv) 1977-02-28
GB1433987A (en) 1976-04-28
FR2232850A1 (sv) 1975-01-03

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