US3851197A - Cartridge type brush holder - Google Patents

Cartridge type brush holder Download PDF

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Publication number
US3851197A
US3851197A US00303127A US30312772A US3851197A US 3851197 A US3851197 A US 3851197A US 00303127 A US00303127 A US 00303127A US 30312772 A US30312772 A US 30312772A US 3851197 A US3851197 A US 3851197A
Authority
US
United States
Prior art keywords
support member
micromotor
cartridge
pair
brushes
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
US00303127A
Other languages
English (en)
Inventor
Y Watanabe
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.)
J Morita Manufaturing Corp
Original Assignee
J Morita Manufaturing Corp
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 J Morita Manufaturing Corp filed Critical J Morita Manufaturing Corp
Application granted granted Critical
Publication of US3851197A publication Critical patent/US3851197A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
    • A61C1/06—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with electric drive
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/38—Brush holders
    • H01R39/39—Brush holders wherein the brush is fixedly mounted in the holder
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
    • H02K5/146—Pivotally supported brushes or brush holders

Definitions

  • a dental handpiece is provided at its outer end with a detachable tool for cutting or drilling, which is rotated at a high speed when used for dental treatment.
  • the handpiece contains a micromotor therein for rotating the tool.
  • This micromotor is a direct current motor so that it has a commutator and brushes.
  • the brushes are likely to be worn with use and must be exchanged for new ones every now and then.
  • the dentist who uses such dental handpieces is not always an expert in electrical instruments so that he finds it somewhat difficult to exchange brushes in the motor of his handpiece. As the brushes become worn, graphite which is the material constituting them is ground into power, which is accumulated in the handpiece to deteriorate the working efficiency of the instrument. Therefore, the motor must sometimes be decomposed for cleaning by removing the accumulated powder therefrom, after which the component parts must again be assembled into the motor. The work requires considerable skill and time.
  • Another object of the invention is to make it easy to remove from inside the motor graphite powder worn off from the brushes.
  • FIG. I is a longitudinal cross-section of one embodiment of the invention.
  • FIG. 2 is a perspective view, on an enlarged scale, of the principal portion of the device shown in FIG. 1.
  • a micromotor generally designated by l.
  • the motor is enclosed inside a handpiece, not shown, and secured to a suitable place therein.
  • the motor comprises a field pole 2 made of a permanent magnet, an armature 3, an armature winding 4 and a shaft 5 journaled in an axially spaced pair of radial bearings 6 and 7.
  • the leads connected to the armature winding 4 are passed through bores in a guide sleeve 8 to be connected to a commutator 9.
  • a tool (not shown) to be rotated is connected to the left-hand side, as viewd in FIG. 1, of the shaft 5.
  • a brush unit 10 comprises a support disk 11 on which a pair of brush holder pins 12 are fixed and spaced apart diametrically of the disk.
  • Each of the pins 12 pierces loosely through a sleeve 13 which can freely rotate about the pin and to which a brush holder 14 has its one end secured.
  • the holder 14 is provided at its outer end with a brush'lS, and a coil spring 16 encircling the sleeve 13 urgesthe holder 14 to turn about the pin 12 in such a direction as to press the brush against the commutator 9.
  • a cap 17 is detachably attached to the disk to cover the brushes and other component parts thereon.
  • the pins 12 are connected to a source of electricity, not shown.
  • the disk 11 with the cap 17 attached thereto can be put into or taken out of the motor casing like a car tridge.
  • the graphite powder produced by wear of the brushes has flown off due to centrifugal force to be attached to the inner surface of the cap and seldom flies out of the cap into that part of the motor casing where the armature is enclosed. Therefore, when the brush unit is taken out, the powder attached to the cap is also taken out. Then, the cap may be taken off from the disk 11 to brush off the attached powder.
  • the device of the invention can completely eliminate such a danger.
  • a brush holder cartridge for use in a micromotor wherein the micromotor includes a casing having inner and outer surfaces, the brush holder cartridge comprising:
  • a brush holder cartridge for use in a micromotor wherein the micromotor includes a casing having inner and outer surfaces, the brush holder cartridge comprising:
  • a cartridge cap which cartridge cap engages said support member such that said support member and said cartridge cap substantially enclose said brush holders and said brushes about said commutator, said support member including a pair of spaced electrically conductive pins integral at one end thereof with said support member, said conductive pins extending from said micromotor such that electrical energy may be applied thereto when '1 brush holder.
  • each spring for maintaining said brushes in contact with the commutator, each spring having two opposing ends and being positioned over a sleeve, one end of each spring being rigidly connected to said support member, the other end thereof being rigidly connected to its associated

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Power Engineering (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
US00303127A 1971-11-09 1972-11-02 Cartridge type brush holder Expired - Lifetime US3851197A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971104807U JPS4860398U (zh) 1971-11-09 1971-11-09

Publications (1)

Publication Number Publication Date
US3851197A true US3851197A (en) 1974-11-26

Family

ID=14390684

Family Applications (1)

Application Number Title Priority Date Filing Date
US00303127A Expired - Lifetime US3851197A (en) 1971-11-09 1972-11-02 Cartridge type brush holder

Country Status (3)

Country Link
US (1) US3851197A (zh)
JP (1) JPS4860398U (zh)
DE (1) DE2253880B2 (zh)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381468A (en) * 1980-06-25 1983-04-26 Siemens Aktiengesellschaft Commutator motor brush mounting arrangement
GB2194687A (en) * 1986-07-10 1988-03-09 Mabuchi Motor Co Electric motor brushgear
DE10203489A1 (de) * 2002-01-30 2003-07-31 Valeo Auto Electric Gmbh Bürstentrageplatte für einen Elektromotor, Elektromotor und Verfahren zur Montage
US20060119212A1 (en) * 2004-11-10 2006-06-08 West Joshua D Brush assembly including biasing member for applying force
EP1808942A2 (de) 2006-01-17 2007-07-18 Dr. Fritz Faulhaber GmbH & Co. KG Bürsteneinrichtung, insbesondere Hammerbürsteneinrichtung, für einen Elektromotor
US20090072656A1 (en) * 2007-09-18 2009-03-19 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Wurzburg Four-pole electric motor drive with hammer brush holder system
CN101854016A (zh) * 2010-05-11 2010-10-06 许晓华 一种电刷改进结构
US20100258327A1 (en) * 2007-11-27 2010-10-14 Florian Esenwein Electrically driven hand-held power tool
US20130140941A1 (en) * 2011-12-02 2013-06-06 Maxon Motor Ag Brush cover for a brush-commutated electric motor and electric motor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753491A1 (de) * 1997-12-02 1999-06-10 Kaltenbach & Voigt Motorhandstück
JP3898942B2 (ja) * 2001-11-30 2007-03-28 並木精密宝石株式会社 ブラシ装置及びブラシ付きモータ
JP4223837B2 (ja) * 2003-02-28 2009-02-12 並木精密宝石株式会社 ブラシ装置及びブラシ付きモータ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2325915A (en) * 1942-04-13 1943-08-03 Singer Mfg Co Permanent magnet motor
US2753477A (en) * 1953-08-31 1956-07-03 Gen Motors Corp Electrical brush assembly
US2755399A (en) * 1952-01-07 1956-07-17 Emerson Electric Mfg Co Brush holder mechanism
US2760094A (en) * 1955-01-03 1956-08-21 Gen Motors Corp Dynamoelectric machine
US3229135A (en) * 1963-05-31 1966-01-11 Cav Ltd Brush assemblies for dynamoelectric machines
US3450916A (en) * 1965-08-18 1969-06-17 Takaichi Mabuchi Brush supporting means for miniature electric motors
US3648086A (en) * 1968-08-07 1972-03-07 Gen Electric Starter generator construction
US3654504A (en) * 1971-03-29 1972-04-04 Gen Electric Brush mechanism

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2325915A (en) * 1942-04-13 1943-08-03 Singer Mfg Co Permanent magnet motor
US2755399A (en) * 1952-01-07 1956-07-17 Emerson Electric Mfg Co Brush holder mechanism
US2753477A (en) * 1953-08-31 1956-07-03 Gen Motors Corp Electrical brush assembly
US2760094A (en) * 1955-01-03 1956-08-21 Gen Motors Corp Dynamoelectric machine
US3229135A (en) * 1963-05-31 1966-01-11 Cav Ltd Brush assemblies for dynamoelectric machines
US3450916A (en) * 1965-08-18 1969-06-17 Takaichi Mabuchi Brush supporting means for miniature electric motors
US3648086A (en) * 1968-08-07 1972-03-07 Gen Electric Starter generator construction
US3654504A (en) * 1971-03-29 1972-04-04 Gen Electric Brush mechanism

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381468A (en) * 1980-06-25 1983-04-26 Siemens Aktiengesellschaft Commutator motor brush mounting arrangement
GB2194687A (en) * 1986-07-10 1988-03-09 Mabuchi Motor Co Electric motor brushgear
DE10203489A1 (de) * 2002-01-30 2003-07-31 Valeo Auto Electric Gmbh Bürstentrageplatte für einen Elektromotor, Elektromotor und Verfahren zur Montage
US7432627B2 (en) 2004-11-10 2008-10-07 Black & Decker Inc. Brush assembly including biasing member for applying force
US20060119212A1 (en) * 2004-11-10 2006-06-08 West Joshua D Brush assembly including biasing member for applying force
US20080315712A1 (en) * 2004-11-10 2008-12-25 Black & Decker Inc. Brush Assembly Including Biasing Member for Applying Force
US7723893B2 (en) * 2004-11-10 2010-05-25 Black & Decker Inc. Brush assembly including biasing member for applying force
EP1808942A2 (de) 2006-01-17 2007-07-18 Dr. Fritz Faulhaber GmbH & Co. KG Bürsteneinrichtung, insbesondere Hammerbürsteneinrichtung, für einen Elektromotor
EP1808942A3 (de) * 2006-01-17 2008-05-14 Dr. Fritz Faulhaber GmbH & Co. KG Bürsteneinrichtung, insbesondere Hammerbürsteneinrichtung, für einen Elektromotor
US20090072656A1 (en) * 2007-09-18 2009-03-19 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Wurzburg Four-pole electric motor drive with hammer brush holder system
US20100258327A1 (en) * 2007-11-27 2010-10-14 Florian Esenwein Electrically driven hand-held power tool
CN101854016A (zh) * 2010-05-11 2010-10-06 许晓华 一种电刷改进结构
US20130140941A1 (en) * 2011-12-02 2013-06-06 Maxon Motor Ag Brush cover for a brush-commutated electric motor and electric motor
US9570963B2 (en) * 2011-12-02 2017-02-14 Maxon Motor Ag Brush cover for a brush-commutated electric motor and electric motor

Also Published As

Publication number Publication date
JPS4860398U (zh) 1973-08-01
DE2253880A1 (de) 1973-05-24
DE2253880B2 (de) 1978-03-09

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