US3714481A - Brush construction for a small electrodynamic machine - Google Patents

Brush construction for a small electrodynamic machine Download PDF

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Publication number
US3714481A
US3714481A US00142398A US3714481DA US3714481A US 3714481 A US3714481 A US 3714481A US 00142398 A US00142398 A US 00142398A US 3714481D A US3714481D A US 3714481DA US 3714481 A US3714481 A US 3714481A
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US
United States
Prior art keywords
spring
arm
brush
frame
reference point
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
US00142398A
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English (en)
Inventor
H Dijkstra
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.)
US Philips Corp
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3714481A publication Critical patent/US3714481A/en
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
    • H02K5/146—Pivotally supported brushes or brush holders

Definitions

  • Such a brush construction is known from British Patent Specification l.0l0,244, in which two brushholder arms are arranged one on each side of a commutator in an end shield, each brush holder arm being at a point intermediate the brush and one end of the brushholder arm by a bent leaf spring arranged in the respective end shield, one end of each brush-holder arm pressing pivotably, by means of an arcuate portion,against a pivot pin rigidly secured to the end shield.
  • the force exerted on the commutator by the brush depends on several factors, such as the manufacturing tolerances in the dimensions of the leaf spring and in its location in the end shield, the tolerances with respect to the point at which the leaf spring exerts pressure on the brush-holder arm and finally the angular position occupied by the brush-holder arm, in view of the spring characteristic of the leaf spring.
  • the latter angular position is itself dependent on several manufacturing tolerances in the dimensions and disposition of various component parts and in addition depends on the degree ofwear of the brush.
  • An embodiment of the invention is characterized in that the pivotable attachement comprises a knife-edge bearing and that the leaf spring exerts a force on the brush-holder arm acting in the direction from the knife edge to the supporting surface of the knife-edge bearing. This permits a very simple bearing construction.
  • a further embodiment of the invention is characterized in that the brush-holder arm is brought out through an aperture provided in the machine and in that the part thus protruding from the machine is extended so as to be capable of being pivoted by hand.
  • This embodiment is of particular importance for the assembly and for the prevention of damage to the frequently small and hence vulnerable brush constructions which are used in the small electrodynamic machines to which the invention relates.
  • pivotably secured brush-holderarms 1 form part of a brush construction of a small direct-voltage commutator motor for use in an electric dry-shaving apparatus.
  • the brush-holder arms I carry gauze brushes 2 which are pressed against the commutator 3 of the motor.
  • the brush-holder arms 1 are brought out through a slit-shaped aperture 6 and the part protruding from the machine is extended so as to enable it to be pivoted by hand.
  • the brush-holder arms can readily be lifted from the commutator, simplifying assembly and protecting the comparatively vulnerable and small brush-constructions during assembly.
  • an electric motor including a frame having a spring-engaging first reference point, and commutator and brush elements
  • the improvement in combination therewith of an assembly for holding each brush against the commutator comprising for each brush an arm having a first end-part pivotally secured to the frame, a remote part holding the brush, and a second reference point along the length of said arm, and-a leaf spring which is generally flat in its unloaded condition defining an initial length between its ends, this spring when the spring has a first end secured to the frame at said first reference point and the spring has a remote part engaging the arm at said second reference point, the distance between said two points being less than said initial spring length, the spring exerting a force on the arm both axially along the length thereof and laterally relative to said pivot and thereby resiliently positioning and urging the brush against the commutator, said spring having a spring characteristic which is very level within a comparatively wide range of spring deflection.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Current Collectors (AREA)
US00142398A 1968-10-09 1971-05-11 Brush construction for a small electrodynamic machine Expired - Lifetime US3714481A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6814414A NL6814414A (enrdf_load_stackoverflow) 1968-10-09 1968-10-09

Publications (1)

Publication Number Publication Date
US3714481A true US3714481A (en) 1973-01-30

Family

ID=19804885

Family Applications (1)

Application Number Title Priority Date Filing Date
US00142398A Expired - Lifetime US3714481A (en) 1968-10-09 1971-05-11 Brush construction for a small electrodynamic machine

Country Status (6)

Country Link
US (1) US3714481A (enrdf_load_stackoverflow)
CA (1) CA919238A (enrdf_load_stackoverflow)
DE (1) DE1950584A1 (enrdf_load_stackoverflow)
FR (1) FR2020226A1 (enrdf_load_stackoverflow)
GB (1) GB1239010A (enrdf_load_stackoverflow)
NL (1) NL6814414A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254353A (en) * 1977-10-19 1981-03-03 Mabuchi Motor Co., Ltd. Brush holder
US4292560A (en) * 1978-02-03 1981-09-29 Siemens Aktiengesellschaft Tachometer generator brush carrier
US5363005A (en) * 1993-01-14 1994-11-08 Mabuchi Motor Co., Ltd. Miniature motor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2417028C2 (de) * 1974-04-08 1983-08-25 Robert Bosch Gmbh, 7000 Stuttgart Elektrische Kleinmaschine
GB2164502B (en) * 1984-08-06 1987-10-28 Mabuchi Motor Co Rotary electric machine
GB2228373A (en) * 1989-02-20 1990-08-22 Johnson Electric Sa Applying pressure to leaf mounted brushes of electric motor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3191085A (en) * 1962-03-26 1965-06-22 Philips Corp Brush holder for electric commutator machine
GB1039415A (en) * 1963-06-07 1966-08-17 Cons Spring Corp Improvements in or relating to brush assembly units and components
US3270230A (en) * 1962-06-11 1966-08-30 Gen Motors Corp Pivotal brush mounting
US3475635A (en) * 1966-12-22 1969-10-28 Tokyo Kagaku Kk Brush means for miniature motors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3191085A (en) * 1962-03-26 1965-06-22 Philips Corp Brush holder for electric commutator machine
US3270230A (en) * 1962-06-11 1966-08-30 Gen Motors Corp Pivotal brush mounting
GB1039415A (en) * 1963-06-07 1966-08-17 Cons Spring Corp Improvements in or relating to brush assembly units and components
US3475635A (en) * 1966-12-22 1969-10-28 Tokyo Kagaku Kk Brush means for miniature motors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254353A (en) * 1977-10-19 1981-03-03 Mabuchi Motor Co., Ltd. Brush holder
US4292560A (en) * 1978-02-03 1981-09-29 Siemens Aktiengesellschaft Tachometer generator brush carrier
US5363005A (en) * 1993-01-14 1994-11-08 Mabuchi Motor Co., Ltd. Miniature motor

Also Published As

Publication number Publication date
NL6814414A (enrdf_load_stackoverflow) 1970-04-13
FR2020226A1 (enrdf_load_stackoverflow) 1970-07-10
GB1239010A (enrdf_load_stackoverflow) 1971-07-14
CA919238A (en) 1973-01-16
DE1950584A1 (de) 1970-04-23

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