US3229135A - Brush assemblies for dynamoelectric machines - Google Patents

Brush assemblies for dynamoelectric machines Download PDF

Info

Publication number
US3229135A
US3229135A US284733A US28473363A US3229135A US 3229135 A US3229135 A US 3229135A US 284733 A US284733 A US 284733A US 28473363 A US28473363 A US 28473363A US 3229135 A US3229135 A US 3229135A
Authority
US
United States
Prior art keywords
brush
arm
commutator
brush assemblies
dynamoelectric machines
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
US284733A
Inventor
Peltret Pierre Henri
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.)
CAV Ltd
Original Assignee
CAV Ltd
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 CAV Ltd filed Critical CAV Ltd
Priority to US284733A priority Critical patent/US3229135A/en
Application granted granted Critical
Publication of US3229135A publication Critical patent/US3229135A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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

Definitions

  • An assembly according to the invention comprises a pivotally mounted arm and an arcuate brush clamped at one end to the free end of the arm, said brush having an arc of curvature struck substantially from the pivot axis of the arm.
  • FIGURE 1 is an end view of a dynamo-electric machine embodying the invention with a part removed for clarity and FIGURE 2 is a side elevation of the machine shown in FIGURE 1 with the sectional portion thereof taken on the line 2-2 of FIGURE 1.
  • armature 1 At one end of the armature 1, a cylindrical and co-axial commutator 2. Bearing on the commutator at equi-angularly spaced points respectively are four brushes 3 each brush being connected to an appropriate point in the electrical circuit of the machine. The brushes are held in position by clamping them respectively to the free ends of four arms 4 pivotally mounted at equi-angularly spaced positions about insulating sleeves 5 having their axes parallel to the axis of the armature. The arrangement is such that in use, when the armature rotates the brushes 3 are trailing with respect to their associated pins. Each arm 4 carries a spring 6 to urge the associated brush into contact with the peripheral surface of the commutator.
  • the sleeves 5 are supported at one end by an annular carrier 7 which is located against axial movement on a step 8 formed in the casing 9 of the machine. At their other ends the sleeves are supported -by further bushes 10 which bear against the cover 11 of the machine. Moreover in order to strengthen the sleeves pins are mounted therein and for one pair of diametrically opposite sleeves these are constituted by through bolts 12 which serve to hold the parts of the machine together and for the other pair of sleeves by pegs 13.
  • each brush is made of arcuate form and has a radius of curvature struck from a centre coincident with the axis of the arm in which it is clamped so that during the life of the brush both the area of contact and the angle of lead remain constant. Moreover a short straight portion is provided at one end of the brush to facilitate the clamping of the brush to the arm.
  • each brush is pivotally mounted about an axis parallel to the armature of the machine. It will be understood that if a face type commutator is used each brush assembly will be pivoted about an axis at right angles to the axis of the machine and parallel to a radius of the disc passing through a point of contact of the brush and commutator.
  • a dynamo-electric machine comprising a casing, a rotor structure including a commutator rotatable within the casing, an end closure member for the casing, a through bolt extending axially within the casing for retaining said end closure member on the casing, an elec trically insulating sleeve mounted about a portion of said through bolt adjacent the commutator, a pair of hollow electrically insulating carriers mounted on the through bolt at opposite ends of said sleeve respectively, said carriers being located within the casing and serving to locate said sleeve on the through bolt, an arm pivotally mounted about said sleeve, an arcuate brush secured to the free end of said arm, said brush having an arc of curvature struck from the pivot axis of said arm and having a short straight portion about which it is clamped to the arm.

Description

Jan. 11, 1966 P. H. PELTRET 3,229,135
BRUSH ASSEMBLIES FOR DYNAMO-ELECTRIC MACHINES Filed May 31, 1965 2 Sheets-Sheet 1 BRUSH ASSEMBLIES FOR DYNAMO-ELECTRIG MACHINES Filed May 31, 1963 P. H. PELTRET 'Jan. 11, 1966 2 Sheets-Sheet 2 N QM A A V United States Patent 3,229,135 BRUSH ASSEMBLIES FOR DYNAMO- ELECTRIC MACHINES Pierre Henri Peltret, London, England, assignor to C.A.V. Limited, London, England Filed May 31, 1963, Ser. No. 284,733 1 Claim. (Cl. 310244) The object of this invention is to provide a brush assembly for a dynamo-electric machine in a convenient form.
An assembly according to the invention comprises a pivotally mounted arm and an arcuate brush clamped at one end to the free end of the arm, said brush having an arc of curvature struck substantially from the pivot axis of the arm.
In the accompanying drawings:
FIGURE 1 is an end view of a dynamo-electric machine embodying the invention with a part removed for clarity and FIGURE 2 is a side elevation of the machine shown in FIGURE 1 with the sectional portion thereof taken on the line 2-2 of FIGURE 1.
Referring to the drawings there is provided, at one end of the armature 1, a cylindrical and co-axial commutator 2. Bearing on the commutator at equi-angularly spaced points respectively are four brushes 3 each brush being connected to an appropriate point in the electrical circuit of the machine. The brushes are held in position by clamping them respectively to the free ends of four arms 4 pivotally mounted at equi-angularly spaced positions about insulating sleeves 5 having their axes parallel to the axis of the armature. The arrangement is such that in use, when the armature rotates the brushes 3 are trailing with respect to their associated pins. Each arm 4 carries a spring 6 to urge the associated brush into contact with the peripheral surface of the commutator.
In the particular example the sleeves 5 are supported at one end by an annular carrier 7 which is located against axial movement on a step 8 formed in the casing 9 of the machine. At their other ends the sleeves are supported -by further bushes 10 which bear against the cover 11 of the machine. Moreover in order to strengthen the sleeves pins are mounted therein and for one pair of diametrically opposite sleeves these are constituted by through bolts 12 which serve to hold the parts of the machine together and for the other pair of sleeves by pegs 13.
Patented Jan. 11, 1966 ice In order to prevent the area of contact of the brush and the commutator varying, as the brush Wears, and more particularly to prevent the angle of lead (ie the angle between the longitudinal axis of the brush and a radius passing through the point of contact of the brush and the commutator) varying each brush is made of arcuate form and has a radius of curvature struck from a centre coincident with the axis of the arm in which it is clamped so that during the life of the brush both the area of contact and the angle of lead remain constant. Moreover a short straight portion is provided at one end of the brush to facilitate the clamping of the brush to the arm.
In the example described above each brush is pivotally mounted about an axis parallel to the armature of the machine. It will be understood that if a face type commutator is used each brush assembly will be pivoted about an axis at right angles to the axis of the machine and parallel to a radius of the disc passing through a point of contact of the brush and commutator.
Although the brushes herein described have been of the trailing type this particular construction is equally useful Where brushes of the leading type are used.
I claim:
A dynamo-electric machine comprising a casing, a rotor structure including a commutator rotatable within the casing, an end closure member for the casing, a through bolt extending axially within the casing for retaining said end closure member on the casing, an elec trically insulating sleeve mounted about a portion of said through bolt adjacent the commutator, a pair of hollow electrically insulating carriers mounted on the through bolt at opposite ends of said sleeve respectively, said carriers being located within the casing and serving to locate said sleeve on the through bolt, an arm pivotally mounted about said sleeve, an arcuate brush secured to the free end of said arm, said brush having an arc of curvature struck from the pivot axis of said arm and having a short straight portion about which it is clamped to the arm.
References Cited by the Examiner UNITED STATES PATENTS ORIS L. RADER, Primary Examiner.
MILTON O. HIRSHFIELD, Examiner.
US284733A 1963-05-31 1963-05-31 Brush assemblies for dynamoelectric machines Expired - Lifetime US3229135A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US284733A US3229135A (en) 1963-05-31 1963-05-31 Brush assemblies for dynamoelectric machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US284733A US3229135A (en) 1963-05-31 1963-05-31 Brush assemblies for dynamoelectric machines

Publications (1)

Publication Number Publication Date
US3229135A true US3229135A (en) 1966-01-11

Family

ID=33309358

Family Applications (1)

Application Number Title Priority Date Filing Date
US284733A Expired - Lifetime US3229135A (en) 1963-05-31 1963-05-31 Brush assemblies for dynamoelectric machines

Country Status (1)

Country Link
US (1) US3229135A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851197A (en) * 1971-11-09 1974-11-26 Morita Mfg Cartridge type brush holder
EP0025152A1 (en) * 1979-08-31 1981-03-18 Black & Decker Inc. Brush assembly and mounting arrangement for a portable tool
FR2616082A1 (en) * 1987-06-05 1988-12-09 Lardy Sa Ets Modulable game
US20080030099A1 (en) * 2004-05-12 2008-02-07 Robert Heitz Carbon Brush For An Electrical Machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677777A (en) * 1952-03-06 1954-05-04 Jr Willis Z West Holder for brush element or elements
US2755399A (en) * 1952-01-07 1956-07-17 Emerson Electric Mfg Co Brush holder mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2755399A (en) * 1952-01-07 1956-07-17 Emerson Electric Mfg Co Brush holder mechanism
US2677777A (en) * 1952-03-06 1954-05-04 Jr Willis Z West Holder for brush element or elements

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851197A (en) * 1971-11-09 1974-11-26 Morita Mfg Cartridge type brush holder
EP0025152A1 (en) * 1979-08-31 1981-03-18 Black & Decker Inc. Brush assembly and mounting arrangement for a portable tool
US4366403A (en) * 1979-08-31 1982-12-28 Black & Decker Inc. Brush assembly and mounting arrangement for a portable tool
FR2616082A1 (en) * 1987-06-05 1988-12-09 Lardy Sa Ets Modulable game
US20080030099A1 (en) * 2004-05-12 2008-02-07 Robert Heitz Carbon Brush For An Electrical Machine

Similar Documents

Publication Publication Date Title
US3484860A (en) Electromotor with detachable stator
US2345835A (en) Device for collecting electric current
JPS604661B2 (en) sliding electrical contact members
US2444826A (en) Brush assembly for dynamoelectric machines
US3229135A (en) Brush assemblies for dynamoelectric machines
US2500571A (en) Reversing mechanism for electric motors
IE39586L (en) Switching apparatus
ES375740A1 (en) Dynamo electric machine having improved slipring assembly
GB1337811A (en) Rotating electrical machine and switch therefor
US3816783A (en) Compound spring arrangement for brush holders of rotary electric machines
US2877435A (en) Miniature brush block for slip-rings
CN110854637A (en) Conductive slip ring
US3925696A (en) Statorless dynamo-electric machine
US2515768A (en) Brush holder and brush
US3487249A (en) Commutators
KR910008271B1 (en) Brush-type electric contact device for electric motor with cylindrical switch
US5214335A (en) Brush and slip ring apparatus for dynamoelectric machines
US3551716A (en) Electric contacts for collector lamellae
GB1344144A (en) Rotor for a dynamo-electric machine and process for producing the same
US2345428A (en) Electric current collector
US3467846A (en) Brushes for electric motors
US3024376A (en) Electric motor with rotatable connector
CN110739593A (en) conductive slip ring for lightning protection
US3416121A (en) Bearingless slip ring assembly
US2399022A (en) Distributor