US3849946A - Commutator grinder - Google Patents

Commutator grinder Download PDF

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Publication number
US3849946A
US3849946A US00414187A US41418773A US3849946A US 3849946 A US3849946 A US 3849946A US 00414187 A US00414187 A US 00414187A US 41418773 A US41418773 A US 41418773A US 3849946 A US3849946 A US 3849946A
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US
United States
Prior art keywords
commutator
support rod
grinder
feed
rod
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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
Application number
US00414187A
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English (en)
Inventor
T Ogura
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.)
Sanwa Kikoh Co Ltd
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Sanwa Kikoh Co Ltd
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Filing date
Publication date
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Publication of US3849946A publication Critical patent/US3849946A/en
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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
    • H01R43/14—Maintenance of current collectors, e.g. reshaping of brushes, cleaning of commutators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/08—Portable grinding machines designed for fastening on workpieces or other parts of particular section, e.g. for grinding commutators

Definitions

  • the commutator grinder is further equipped withan infeed mechanism and a traverse feed mechanism which enable the grindstone or the like to be fed Int. B24b 19/26 t ward and in the traverse direction of the work.
  • the infeed mechanism comprises a handle, worm gearing,
  • This invention relates generally to grinding machines, and more specifically to a commutator grinder to be mounted directly on a commutator machine such for example as a motor or generator for reconditioning the surface of the commutator in situ, without removing the armature therefrom.
  • a commutator machine such for example as a motor or generator for reconditioning the surface of the commutator in situ, without removing the armature therefrom.
  • the mica insulation between the copper commutator segments of the usual commutator machines is generally more resistant to the wear of the brushes than the segments, there occurs a phenomenon known in the art as high mica by which is meant the mica projecting from between the worn copper segments.
  • the commutators thus become gradually unable to perform their functions. It is therefore necessary to recondition the commutator faces at regular time intervals.
  • Another object of the invention is to provide a commutator grinder which can be easily mounted in the most convenient position on a commutator machine and in which a grindstone or like block of abrasive material can also be easily located in a desired starting position on the commutator to be ground thereby.
  • Still another object of the invention is to provide a commutator grinder including both an infeed mechanism and a traverse feed mechanism of very simple construction which can be operated manually to enable the grindstone or the like to uniformly recondition the commutator face.
  • a further object of the invention is to provide a commutator grinder in which the infeedmechanism includes a reduction gear adapted to impart a highly precise infeeding movement to the grindstone or the like.
  • this invention provides a commutator grinder which, stated in its perhaps broadest aspects, includes a first support rod carrying a block of abrasive material at its lower end and slidably received in a vertical sleeve. A second support rod also slidably re-.
  • the desired infeeding and traversing movements of the abrasive block are provided by an infeed mechanism which causes the first support rod to move up and down relative to the sleeve and by a traverse feed mechanism which causes the second support rod to move back and forth relative to the hollow arm.
  • the infeed mechanism comprises a first handle, a first feed rod screw-threadedly received in an' axial bore of the first support rod, and reduction gear means such as worm gearing adapted to transmit the rotation of the first handle to the first feed rod at greatly reduced speed.
  • the rotation of the first feed rod is then. translated into the linear motion of the first support rod relative to the sleeve.
  • the traverse feed mechanism comprises a second feed rod screw-threadedly received in an axial bore of the second support rod, and a second handle mounted directly on the second feed rod. No reduction gearing is usually required for causing the traversing movement of the abrasive block.
  • FIG. 1 is a perspective view of a commutator grinder constructed by way of a preferred. embodiment of this invention
  • FIG. 2 is an end elevational view, partly in vertical section, showing in more detail the infeed mechanism and the means for supporting a grindstone or like block of abrasive material in the commutator grinder of FIG.
  • FIG. 3 is a partial vertical sectional view of the worm gearing used in the infeed mechanism of FIG. 2;
  • FIG. 4 is a partial side elevational view, partly in vertical section, showing in more detail the traverse feed mechanism in the commutator grinder of FIG. 1;
  • FIG. 5 is a side elevational view showing the commutator grinder of FIG. 1 as used for reconditioning the commutator face of an electric motor illustrated in partial vertical section in the drawing.
  • the commutator grinder illustrated therein by way of a preferred embodiment of the invention includes a grindstone or a similar block of abrasive material 10 affixed at the lower end of a first support rod 11.
  • This first support rod is slidably received in a sleeve 12, as best illustrated in FIG. 2, in such a manner that by the manual turn of an infeed handle 13, the first support rod 11 together with the abrasive block sup ported at its lower end is movable up and down relative to the sleeve.
  • the abrasive block 10, the first support rod 11 and other related parts hereinafter set forth in detail are supported by an offset arm 14 clamped at 15 to the upper end of an upright standard 16, in such a fashion that the abrasive block is movable toward and away from the standard by the manual turn of a traverse feed handle 17.
  • Electromagnet means 18 of any known or suitable construction is clamped at 19 to the standard 16 for removably attaching the commutator grinder to the casing of a desired commutator machine.
  • the position of the clamp 19 and therefore of the electromagnet means 18 relative to the standard 16 is variable by loosening bolts 20 on the clamp 19.
  • FIG. 2 illustrates the details of the means for securing the abrasive block 10 to the bottom end of the first support rod 11 and of the infeed mechanism for pressing the abrasive block against the work in a direction normal to that of the axis of its rotation.
  • the abrasive block 10 is fixedly supported between a pair of plate members 21 which are bolted at 22 to a fixture 23 at the bottom end of the first support rod 11.
  • a piece of wood 24 is interposed between the abrasive block 10 and the fixture 23 in order to cushion vibrations which may be produced during grinding operation.
  • the plate members 21 are formed of electrically insulating material, they will serve, in cooperation with the piece of wood 24, to electrically insulate the rest of the grinder machine from the commutator being ground thereby. It will be apparent that the abrasive block 10 should also be formed of electrically insulating material. The abrasive block when worn or damaged can be easily replaced by simple manipulation of the bolts 22.
  • the reduction gear means takes the form of worm gearing comprising a worm 25 fixedly mounted on a revolvable shaft 26 at one end of which is secured the above mentioned infeed handle 13, and a worm wheel 27 keyed at 28 to a first feed rod 29 which is rotatably supported as by conical roller bearings 30 in coaxial relationship to the first support rod 11.
  • the worm 25 and the worm wheel 27 are in gear as shown in FIG. 3.
  • the lower portion of the first feed rod 29 is received in a hollow 31 formed axially of the first support rod 11, and square threads formed at 32 on the first feed are mated with internal threads 33 formed correspondingly on the inside of the first support rod.
  • the abrasive block 10 will be fed only 0.2 millimeter by each complete revolution of the infeed handle 13.
  • FIG. 4 illustrates in detail the traverse feed mechanism for feeding the abrasive block 10 in a traverse direction of the commutator being ground thereby.
  • the traverse feed mechanism includes the aforesaid offset arm 14 clamped at 15 to the upper end of the upright standard 16. It will be seen that the length of this offset arm projecting from the clamp 15 is adjustable within predetermined limits by loosening bolts 35 on the clamp.
  • the arm 14 is hollowed axially therethrough to slidably receive a second support rod 36, which is also hollowed axially to receive a second feed rod 37 screwthreaded at 38 to mate with internal screw threads 39 cut on the inside of the second support rod 36.
  • the second feed rod 37 is rotatably supported by the offset arm 14 via a radial ball bearing 40, and the traverse feed handle 17 is fixedly mounted on one end of the second feed rod projecting out of the arm 14. Since a key 41 formed on the outside of the second support rod 36 is slidably fitted in a keyway formed longitudinally on the inside of the offset arm 14, the rotation of the traverse feed handle 17 and hence of the second feed rod 37 is translated into the linear motion of the second support rod 36 relative to the arm.
  • One end of the second support rod 36 exposed from the offset arm 14 is securely coupled through a fixture 42 to a frame 43 supporting the sleeve 12, as best illustrated in FIG.
  • FIG. 5 illustrates a mode of use of the preferred embodiment of the invention set forth in the foregoing.
  • the commutator grinder according to the invention is supported in position by the electromagnet means 18 which is attached to an end plate 44 of a desired commutator machine such, for example, as a motor 45.
  • the height of the standard 16 above the electromagnet means 18 may be adjusted as required by loosening the bolts 20 on the clamp 19.
  • the traverse feed handle 17 is then turned to cause the abrasive block 10 to move traversely of the commutator 46 mounted within the motor 45 until the abrasive block is located right above the commutator. Thereafter the infeed handle 13 is turned to cause the abrasive block 10 to descend into contact with the commutator 46 as seen in the drawing.
  • an electric current is delivered in the usual manner to the motor 45, either continuously or at suitable time intervals, to set its armature in rotation.
  • the traverse feed handle 17 may be turned in both directions thereby imparting a traversing movement to the abrasive block 10 to ensure uniform grinding of the entire surface of the commutator 46.
  • the infeed handle 13 may also be turned as required in the predetermined direction to cause descent of the abrasive block into the commutator and hence to provide the required grinding pressure.
  • a commutator grinder to be mounted on a commutator machine for reconditioning the surface of the commutator in situ comprising in combination:
  • a sleeve adapted to slidably receive said first support rod
  • infeed means for moving said first support rod up and down relative to said sleeve in order to infeed said block of abrasive material with respect to the commutator;
  • a hollow arm adapted to slidably receive said second support rod
  • traverse feed means for moving said second support rod back and forth relative to said arm in order to impart traversing motion to said block of abrasive material with respect to the commutator;
  • a standard having electromagnet means adapted to releasably attach the commutator grinder to the commutator machine, said arm being coupled to the upper end of said standard at a right angle thereto.
  • a key adapted to permit said first support rod to move only linearly relative to said sleeve
  • said reduction gear means comprises:
  • a worm in mesh with said worm wheel, said worm being fixedly mounted on a shaft to which is secured said handle.
  • said traverse feed means comprises:
  • said arm is coupled to the upper end of said standard by means of a clamp, said clamp being loosenable to vary the length of the portion of said arm projecting therefrom.
  • said electromagnet means is coupled to said standard by means of a clamp, said clamp being loosenfirst support rod, said feed rod being externally able to vary the height of said standard.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US00414187A 1973-06-04 1973-11-09 Commutator grinder Expired - Lifetime US3849946A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48062037A JPS5250681B2 (de) 1973-06-04 1973-06-04

Publications (1)

Publication Number Publication Date
US3849946A true US3849946A (en) 1974-11-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00414187A Expired - Lifetime US3849946A (en) 1973-06-04 1973-11-09 Commutator grinder

Country Status (6)

Country Link
US (1) US3849946A (de)
JP (1) JPS5250681B2 (de)
DE (1) DE2358524A1 (de)
FR (1) FR2232104B1 (de)
GB (1) GB1437247A (de)
IT (1) IT999774B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007562A (en) * 1975-09-26 1977-02-15 Hiroji Egashira Grinding apparatus for commutators
US4536915A (en) * 1982-03-22 1985-08-27 Jean Guglielmo Machine for truing electrical collectors and the like
US20030080647A1 (en) * 2001-10-29 2003-05-01 Mitsubishi Denki Kabushiki Kaisha Rotary electric machine and a method of producing the same
CN106272043A (zh) * 2016-08-17 2017-01-04 黄石哈特贝尔精密锻造有限公司 一种无心磨无级变速自动进料装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5582074U (de) * 1978-11-29 1980-06-06
CN107263259A (zh) * 2017-06-20 2017-10-20 滁州恒通磁电科技有限公司 一种磁瓦磨弧夹具

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US379344A (en) * 1888-03-13 Daniel j
US1316942A (en) * 1919-09-23 decker
US1784972A (en) * 1928-05-28 1930-12-16 William Lambie Machine for forming screw propellers
US1984528A (en) * 1932-09-02 1934-12-18 Oakes Prod Corp Apparatus for the surface finishing of metal
US2610451A (en) * 1949-06-25 1952-09-16 Norton Co Lapping machine
US2703470A (en) * 1953-01-23 1955-03-08 Mitchel Tyler Company Lens grinding apparatus
US2750714A (en) * 1950-12-04 1956-06-19 Mid West Abrasive Co Swing grinder
US3667165A (en) * 1971-02-16 1972-06-06 G & B Automated Equipment Ltd Conditioning grinder

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190928340A (en) * 1909-12-04 1911-01-04 Leonard Newitt Improved Commutator Grinder for Dynamos and Motors.
DE533790C (de) * 1929-07-21 1931-09-18 Aeg Vorrichtung zum Abschleifen von im eingebauten Zustand schwer zugaenglichen, umlaufenden Kontakten elektrischer Maschinen
US2818655A (en) * 1955-02-10 1958-01-07 Gaston Raoul Hugh De Magnetic tool guide
US2741078A (en) * 1955-06-01 1956-04-10 United States Steel Corp Portable grinding tool

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US379344A (en) * 1888-03-13 Daniel j
US1316942A (en) * 1919-09-23 decker
US1784972A (en) * 1928-05-28 1930-12-16 William Lambie Machine for forming screw propellers
US1984528A (en) * 1932-09-02 1934-12-18 Oakes Prod Corp Apparatus for the surface finishing of metal
US2610451A (en) * 1949-06-25 1952-09-16 Norton Co Lapping machine
US2750714A (en) * 1950-12-04 1956-06-19 Mid West Abrasive Co Swing grinder
US2703470A (en) * 1953-01-23 1955-03-08 Mitchel Tyler Company Lens grinding apparatus
US3667165A (en) * 1971-02-16 1972-06-06 G & B Automated Equipment Ltd Conditioning grinder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007562A (en) * 1975-09-26 1977-02-15 Hiroji Egashira Grinding apparatus for commutators
US4536915A (en) * 1982-03-22 1985-08-27 Jean Guglielmo Machine for truing electrical collectors and the like
US20030080647A1 (en) * 2001-10-29 2003-05-01 Mitsubishi Denki Kabushiki Kaisha Rotary electric machine and a method of producing the same
US6952067B2 (en) * 2001-10-29 2005-10-04 Mitsubishi Denki Kabushiki Kaisha Rotary electric machine and a method of producing the same
CN106272043A (zh) * 2016-08-17 2017-01-04 黄石哈特贝尔精密锻造有限公司 一种无心磨无级变速自动进料装置

Also Published As

Publication number Publication date
FR2232104A1 (de) 1974-12-27
FR2232104B1 (de) 1977-08-12
GB1437247A (en) 1976-05-26
JPS5010407A (de) 1975-02-03
JPS5250681B2 (de) 1977-12-27
DE2358524A1 (de) 1974-12-12
IT999774B (it) 1976-03-10

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