US3656016A - Subframe for power tool having double insulated brush holders - Google Patents

Subframe for power tool having double insulated brush holders Download PDF

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Publication number
US3656016A
US3656016A US78431A US3656016DA US3656016A US 3656016 A US3656016 A US 3656016A US 78431 A US78431 A US 78431A US 3656016D A US3656016D A US 3656016DA US 3656016 A US3656016 A US 3656016A
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US
United States
Prior art keywords
frame members
subframe
brush
insert
receiving
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
US78431A
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English (en)
Inventor
Anthony Jacyno
Harold R Botefuhr
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.)
BENCHMARK TOOL COMPANY A CORP OF OH
GW Murphy Industries Inc
Original Assignee
GW Murphy Industries Inc
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 GW Murphy Industries Inc filed Critical GW Murphy Industries Inc
Application granted granted Critical
Publication of US3656016A publication Critical patent/US3656016A/en
Assigned to BENCHMARK TOOL COMPANY, A CORP. OF OH reassignment BENCHMARK TOOL COMPANY, A CORP. OF OH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MCGRAW-EDISON COMPANY A CORP. OF DE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H02K5/148—Slidably supported brushes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H02K7/145—Hand-held machine tool

Definitions

  • ABSTRACT A subframe for a power tool comprised of first and second frame members secured together in contiguous engagement throughout a substantial portion of their peripheries.
  • the frame members include complementary cut outs defining a motor receiving opening.
  • a pair of brush receiving spaces are defined by a pair of stuck out portions on opposite sides of the motor receiving opening in one of the frame members together with an opposed notch in the other of the frame members.
  • Each of the brush receiving spaces is adapted to receive one or more insulating inserts for holding brushes.
  • the subframe therein disclosed is formed of a pair of stamped metal plates that are mirror images of one another.
  • Semisphen'cal struck out portions define spherical bearing receiving recesses while semi-cylindrical struck out portions define cylindrical brush receiving spaces, all due to the fact that both plates are mirror images of one another.
  • brush receiving spaces are defined by struck out portions in one of the frame members and which are bounded by substantially planar portions in the other frame member.
  • the brush receiving spaces have a generally uniform rectangular cross section and the frame member opposite the struck out portion further includes a notch for receipt of brush holding means.
  • the brush receiving spaces are located on opposite sides of a motor receiving space in the frame members defined by complementary cut outs therein.
  • the brush holding means are comprised of two elements, the first including a hollow insert received snugly within a brush receiving space and including a flange or lip which is adapted to be secured to one or both of the frame members.
  • the insert is formed of any suitable type of electrical insulating material.
  • the second insert is received within the hollow of the first insert and is secured to one or both of the frame members by any suitable means.
  • a single screw may be employed to secure both inserts together and to the subframe; The innermost one of the inserts in turn mounts an electrical brush forming part of the motor used in the portable power tool.
  • An electrical connector may extend from the innermost insert for connection to an electrical lead in the electrical circuitry and for safety purposes, the outermost insert is provided with a projection extending away from the subframe and having a key-shaped notch in which an electrical lead may be received and gripped.
  • FIG. 1 is a side elevation of a subframe for an electrical power tool made according to the invention
  • FIG. 2 is a fragmentary side elevation of the subframe taken at an angle of approximately 180 from the position of the view shown in FIG. I;
  • FIG. 3 is a vertical section taken approximately along the line 3-3 of FIG. 2;
  • FIG. 4 is a horizontal section taken approximately along the line 4-4 of FIG. 1.
  • FIGS. l-3 An exemplary embodiment of a subframe for a power tool is best seen in FIGS. l-3, inclusive, and comprises a pair of stamped metal plates 10 and 12 located together in contiguous relation about a substantial portion of their periphery. Means, in the form of rivets I4, secure the plates 10 and 12 together to form the subframe.
  • the assemblage is strengthened by means of outturned flanges 16 extending from both sides of the frame members 10 and 12.
  • the subframe includes a motor receiving opening, generally designated 18, defined by a pair of complementary cut outs, one in each of the frame members 10 and 12. Also included is a transmission receiving opening, generally designated 20, which is similarly formed.
  • Opposite sides of the motor receiving opening 18 include semi-spherical struck out portions 22 in both of the plates 10 and 12 to define spherical bearing recesses which may receive spherical bearings 24 for purposes of mounting opposite ends of a motor shaft 26.
  • One end of the motor shaft 26 mounts an impeller 28 for rotation therewith for the purpose of drawing cooling air through suitable vents in the tool housing (not shown) and for directing the same toward a motor stator 30 as well as a rotor 32.
  • the other end of the shaft 26 mounts a commutator 34 which cooperates with brushes 36 to provide electrical power to rotor windings (not shown).
  • the same includes gearing 38 in engagement with a gear transmission, generally designated 40, to ultimately drive an output shaft 42.
  • the end of the output shaft 42 may bear threads 44 for connection to a chuck or the like.
  • the output shaft 42 could be connected to a motion converting mechanism such as a rotary to reciprocating motion converting mechanism if the subframe is to be employed in a power tool such as a saber saw or a hedge trimmer.
  • the varus gearing comprising the transmission 40 may be mounted on suitable shafts received in spherical bearings mounted in spherical bearing receiving recesses defined by semi-spherica1 struck out portions 46 similar to the struck out portions 22.
  • spherical bearings mounted in spherical bearing receiving recesses defined by semi-spherica1 struck out portions 46 similar to the struck out portions 22.
  • other types of bearing receiving recesses or bearing mounts may be employed and it is to be understood that the particular transmission 40 and the means of mounting bearings form no part of the invention.
  • the motor-stator 30 is secured to the subframe by insulating mounting means, generally designated 48.
  • the mounting means 48 form no part of the instant invention but preferably are of the form disclosed in the copending application of Anthony Jacyno entitled Modular Design Double Insulated Field, Ser. No. 37,810, filed May 15, 1970, and assigned to the same assignee as the instant application; the
  • the subframe is completed by brush holding spaces for the brushes 36 and brush holders received therein.
  • the brush holding spaces are defined by struck out portions in the frame member and are located on opposite sides of the motor receiving opening 18 about the commutator 34.
  • the brush receiving spaces are further defined by a substantially planar portion 52 on the plate 12 including a cooperating notch 54, best seen in FIG. 4.
  • a rectangular brush receiving space of generally uniform cross section is defined with the same including a notched out portion in the one wall defined by the frame member 12.
  • an outer insert 56 formed of an insulating material and having a rectangular hollow 58 for receiving an inner brush holding insert 60 also formed of a insulating material, but preferably of an insulating material different from the insulating material of which the insert 56 is formed.
  • the inner insert 60 includes a central hollow 62 which receives one of the brushes 36.
  • the inner insert 60 includes a pair of wings 64 of symmetrical configuration so that the same insert may be located either above or below the commutator 34 thereby eliminating the necessity of forming two different inserts.
  • the insert 60 further includes a rectangular opening 66 through which an electrical connector 68 may extend to make electrical contact with the associated brush 36.
  • the electrical connector receives one end of an electrical lead 70 forming part of the electrical circuit of the motor.
  • the insert 60 may contain suitable spring biasing means (not shown) for biasing the associated brush 36 into contact with the commutator 34.
  • the outer insert 56 includes a rear wall 72 which rests in spaced relationship to the outermost portion 73 of the struck out portion 50, a pair of opposed side walls 74 which abut the side walls of the struck out portion 50, a base 75 which bridges the side walls 74 across the opening of the notch 54, a securing ear 76 (FIG. 4) and a lead gripping ear 78. Due to the nature of the construction, outer insert 56 is made in rights and lefts for use on the opposite sides of the tool.
  • the securing ear 76 includes a bore (not shown) for receiving a screw 80 which may extend therethrough into a corresponding bore (not shown) in either one or both of the frame members 10 and 12.
  • the wings 64 of the inner insert 60 are configured so that they will underlie the head of the screw 80 so that a single screw will suffice to secure both of the inserts 56 and 60 to the subframe.
  • the distance between the undersurface of each wing 64 and the plane of the outer bottom surface of the insert 60 is sufficient to provide a small clearance between the insert 60 and the rear wall 72 of the outer insert 56 so that tightening the screw 80 will not snap off the wing 64.
  • the wire gripping car 78 terminates in an outturned projection 82 (FIGS. 2-4) which extends away from the subframe and includes a keyway shaped notch 84 for receiving and gripping the lead 70 as it extends from the electrical connector 68 to outer electrical conductors associated with the motor.
  • the narrow opening of the keyway shaped notch 84 permits insertion of a lead 80 thereinto through a slight flexing of the insulation on the same, and when the lead is fully within the enlarged portion of the keyway shaped notch 84, the elasticity of the insulation will tend to cause the lead to fill the enlarged portion and be retained by the narrow neck thereof.
  • the ust-described construction provides a simple and inexpensive double insulation mounting for the brushes 36; and one that is reinforced. That is, because the brush holding means in the form of the inserts 56 and 60 are essentially sandwiched between the two frame members 10 and 12, and extremely durable construction results. Furthermore, the construction provides for ease of assembly insofar as it may be formed using stamped sheet metal frame members or, in the alternative, heat pressed or vacuum processed plastic sheets if desired. Finally, the use of but a single securing element to secure each multipart brush holding means in place provides a significant advantage in terms of maintenance and the presence of the lead gripping ear provides a further safety factor against shorting which could be caused by one of the electrical leads vibrating loose from the electrical connector during operation of the tool.
  • a subframe for a power tool comprising: first and second plate-like frame members, in contiguous engagement throughout a substantial portion of their peripheries; means securing said frame members together; means in said frame members receiving a motor and including complementary cut outs in each of said frame members defining a motor receiving opening; and means defining a pair of brush receiving spaces located on opposite sides of said opening, each said space being defined by a struck out portion in one of said frame members and bounded by a substantially planar portion of the other of the frame members.
  • the subframe of claim 2 further including a pair of brush holding means, one in each of said spaces, and each comprised of an outer, insulating insert received in one of said spaces, and an inner brush holder formed of insulating material received in said outer insert, and lead gripping means on said outer insert.
  • a subframe for a power tool comprising: first and second stamped metal plate-like frame members in contiguous engagement throughout a substantial portion of their peripheries; means securing said frame members together; means in said frame members for receiving a motor and including complementary cut outs in each of said frame members defining a motor receiving opening; complementary struck out portions in said framemembers adjacent opposite sides of said opening for receiving bearings adapted to rotatably mount in a motor shaft; and means defining a pair of brush receiving spaces located on opposite sides of said opening different from said first mentioned sides, each said space being defined by struck out portion in one of said frame members and a notch in the other frame member-opposite the struck out portion.
  • each of said brush holding means comprising a first hollow insert adapted to snugly fit in a respective one of said spaces, said insert further including a securing portion adapted to overlap the frame member having the notch therein, and fastening means associated with said securing portion for securing the insert to said notched frame member, and a brush holding insert receiving within the hollow of said first mentioned insert for holding a motor brush, fastening means for securing said inner insert .to said subframe, and means on one of said inserts defining a projection away from said subframe, said projection including a notch therein adapted to receive an electrical lead extending to the brush in said inner insert; said inserts being formed of insulating material.
  • both of said fastening means comprise a single element.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Motor Or Generator Current Collectors (AREA)
US78431A 1970-10-06 1970-10-06 Subframe for power tool having double insulated brush holders Expired - Lifetime US3656016A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7843170A 1970-10-06 1970-10-06

Publications (1)

Publication Number Publication Date
US3656016A true US3656016A (en) 1972-04-11

Family

ID=22143989

Family Applications (1)

Application Number Title Priority Date Filing Date
US78431A Expired - Lifetime US3656016A (en) 1970-10-06 1970-10-06 Subframe for power tool having double insulated brush holders

Country Status (10)

Country Link
US (1) US3656016A (OSRAM)
AU (1) AU3410171A (OSRAM)
BE (1) BE773516A (OSRAM)
CA (1) CA935219A (OSRAM)
DE (1) DE2149905A1 (OSRAM)
FR (1) FR2111022A5 (OSRAM)
GB (1) GB1369007A (OSRAM)
IT (1) IT940960B (OSRAM)
NL (1) NL7113695A (OSRAM)
ZA (1) ZA716462B (OSRAM)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813567A (en) * 1971-11-08 1974-05-28 Hilti Ag Electrical contact for stators in electric tools
US4059776A (en) * 1976-04-19 1977-11-22 Stackpole Carbon Company Electric motor brush mounting
US4800312A (en) * 1987-05-21 1989-01-24 Shop-Vac Corporation Mounting for brushes of electric motors
US5373210A (en) * 1993-03-05 1994-12-13 Shop Vac Corporation Motor brush spring subassembly
EP1430979A1 (en) * 2002-12-21 2004-06-23 Johnson Electric S.A. A motor and gear box combination
US20090147618A1 (en) * 2005-08-26 2009-06-11 Bsh Bosch Und Siemens Hausgerate Gmbh Kitchen appliance provided with a reinforced electric motor-gear stage arrangement and method for producing an electric motor-driven kitchen appliance

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2233833A (en) * 1989-07-05 1991-01-16 Johnson Electric Sa Electric motor subassembly for foodmixer
FR2897992A1 (fr) * 2006-02-24 2007-08-31 Arvinmeritor Light Vehicle Sys Dispositif d'assemblage pour moteur electrique.

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US781062A (en) * 1903-04-24 1905-01-31 Cincinnati Electrical Tool Company Electrical tool.
US1587738A (en) * 1919-02-11 1926-06-08 Howard A Whiteside Electric motor
US2532823A (en) * 1949-08-25 1950-12-05 Helmut W Schumann Motor tool
US3119942A (en) * 1960-10-03 1964-01-28 Oster John Mfg Co Electric motor for hand held appliance
US3259770A (en) * 1962-06-08 1966-07-05 Sunbeam Corp Portable electric tool with a two part housing
US3264506A (en) * 1962-06-27 1966-08-02 Gen Motors Corp Dynamoelectric machine
US3290524A (en) * 1964-03-25 1966-12-06 Black & Decker Mfg Co Brush holder assembly for insulated housing
US3344291A (en) * 1964-11-23 1967-09-26 Millers Falls Co Double insulated hand tool
US3430084A (en) * 1966-07-06 1969-02-25 Rockwell Mfg Co Electric motor and brush assembly for a portable tool

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US781062A (en) * 1903-04-24 1905-01-31 Cincinnati Electrical Tool Company Electrical tool.
US1587738A (en) * 1919-02-11 1926-06-08 Howard A Whiteside Electric motor
US2532823A (en) * 1949-08-25 1950-12-05 Helmut W Schumann Motor tool
US3119942A (en) * 1960-10-03 1964-01-28 Oster John Mfg Co Electric motor for hand held appliance
US3259770A (en) * 1962-06-08 1966-07-05 Sunbeam Corp Portable electric tool with a two part housing
US3264506A (en) * 1962-06-27 1966-08-02 Gen Motors Corp Dynamoelectric machine
US3290524A (en) * 1964-03-25 1966-12-06 Black & Decker Mfg Co Brush holder assembly for insulated housing
US3344291A (en) * 1964-11-23 1967-09-26 Millers Falls Co Double insulated hand tool
US3430084A (en) * 1966-07-06 1969-02-25 Rockwell Mfg Co Electric motor and brush assembly for a portable tool

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813567A (en) * 1971-11-08 1974-05-28 Hilti Ag Electrical contact for stators in electric tools
US4059776A (en) * 1976-04-19 1977-11-22 Stackpole Carbon Company Electric motor brush mounting
US4800312A (en) * 1987-05-21 1989-01-24 Shop-Vac Corporation Mounting for brushes of electric motors
AU603442B2 (en) * 1987-05-21 1990-11-15 Shop-Vac Corporation Mounting for brushes of electric motors
US5373210A (en) * 1993-03-05 1994-12-13 Shop Vac Corporation Motor brush spring subassembly
EP1430979A1 (en) * 2002-12-21 2004-06-23 Johnson Electric S.A. A motor and gear box combination
US20040124727A1 (en) * 2002-12-21 2004-07-01 Lau Kevin King Wai Motor and gearbox combination
US7156191B2 (en) 2002-12-21 2007-01-02 Johnson Electric S.A. Motor and gearbox combination
CN1320732C (zh) * 2002-12-21 2007-06-06 德昌电机股份有限公司 电机与齿轮箱结合体
US20090147618A1 (en) * 2005-08-26 2009-06-11 Bsh Bosch Und Siemens Hausgerate Gmbh Kitchen appliance provided with a reinforced electric motor-gear stage arrangement and method for producing an electric motor-driven kitchen appliance
CN101252864B (zh) * 2005-08-26 2011-04-06 Bsh博施及西门子家用器具有限公司 具有加强的电动机-传动级装置的厨房用具和制造电动厨房用具的方法
US8313233B2 (en) 2005-08-26 2012-11-20 Bsh Bosch Und Siemens Hausgeraete Gmbh Kitchen appliance provided with a reinforced electric motor-gear stage arrangement and method for producing an electric motor-driven kitchen appliance

Also Published As

Publication number Publication date
DE2149905A1 (de) 1972-04-13
NL7113695A (OSRAM) 1972-04-10
CA935219A (en) 1973-10-09
BE773516A (fr) 1972-01-31
GB1369007A (en) 1974-10-02
FR2111022A5 (OSRAM) 1972-06-02
AU3410171A (en) 1973-04-05
ZA716462B (en) 1972-06-28
IT940960B (it) 1973-02-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BENCHMARK TOOL COMPANY, A CORP. OF OH

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MCGRAW-EDISON COMPANY A CORP. OF DE;REEL/FRAME:003857/0716

Effective date: 19800930

Owner name: BENCHMARK TOOL COMPANY, A CORP. OF OH, OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MCGRAW-EDISON COMPANY A CORP. OF DE;REEL/FRAME:003857/0716

Effective date: 19800930