US2964663A - Brush holders for dynamo electric machines - Google Patents

Brush holders for dynamo electric machines Download PDF

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Publication number
US2964663A
US2964663A US790716A US79071659A US2964663A US 2964663 A US2964663 A US 2964663A US 790716 A US790716 A US 790716A US 79071659 A US79071659 A US 79071659A US 2964663 A US2964663 A US 2964663A
Authority
US
United States
Prior art keywords
brushes
brush
brush holder
spring
extension
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
US790716A
Other languages
English (en)
Inventor
Jowett Walter Gordon
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.)
English Electric Co Ltd
Original Assignee
English Electric Co 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 English Electric Co Ltd filed Critical English Electric Co Ltd
Application granted granted Critical
Publication of US2964663A publication Critical patent/US2964663A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01R39/381—Brush holders characterised by the application of pressure to brush

Definitions

  • This invention relates to brush holders for dynamoelectric machines. It is concerned with brush holders of the kind housing two or more brushes.
  • a brush holder assembly includes, in combination, a double brush holder, tandem brushes slidable therein, and a pressure applying member for each brush extending over the top of both brushes, said brush holder being slotted to allow said member to follow the brushes as they wear, and each of said brushes having a step on the top face thereof so as to clear the member associated with the other brush.
  • Fig. 1 shows a sectional elevation of one form of brush holder according to the invention
  • Fig. 2 is a plan view of the brush holder
  • Fig. 3 is a perspective view of one of the brushes.
  • Figs. 4 and 5 are a plan and elevation respectively of an alternative spring arrangement.
  • a brush holder frame is indicated at 1. Pairs of narrow brushes 2 are slidably mounted in brush compartments 3 in the frame 1.
  • the other end of the flexible braid carries a clip 9 which is riveted to the brush holder frame 1.
  • the flexible braid provides a direct electrical connection from the brushes through the plate 8 to the brush holder frame bypassing the spring.
  • each brush is cut away, as indicated at 10, so as to form a step in the top of the brush and a pigtail 11 of the usual type is attached to the lower face of the step.
  • the steps of adjacent brushes are diagonally opposite so that each spring 4 exerts pressure, through the plate 8, on one brush only, without fouling the adjacent brush.
  • the brushes bear on a commutator, indicated at 12.
  • the frame 1 has slots 13 to permit the spring pressure to be maintained on the brushes when these considerably shorten due to wear. Such a case where the brushes have worn to the full extent is shown chain dotted in Fig. 1.
  • the springs 4 which have curved ends 14 for ease in handling, are retracted and allowed to rest on the support lugs 15, as shown chain dotted in Fig. 1.
  • one of the brushes in a pair has the spring engaging end cut away centrally, whilst the other brush has the spring engaging end cut away at both sides.
  • Springs are arranged to act on the upper parts thus formed.
  • the spring finger type of spiral spring shown in Figs. 4 and 5 may be used, each of the spring fingers 20 engaging a separate brush.
  • more than two brushes may be mounted side by side in the peripheral direction. In each arrangement the spring engaging ends of the brushes will be cut away to prevent spring fouling.
  • a brush holder assembly including, in combination, a double brush holder, tandem brushes slidable therein, and a pressure applying member for each brush extending over the top of both brushes, said brush holder being slotted to allow said member to follow the brushes as they wear, and each of said brushes having a step on the top face thereof so as to clear the member associated with the other brush.
  • a brush holder assembly including, in combination, a double brush holder, tandem brushes slidable therein, and a pressure applying spiral spring for each brush having an extension extending over the top of both brushes, said brush holder being slotted to allow the said extension to follow the brushes as they wear, and each of said brushes having a step on the top face thereof so as to clear the extension of the spiral spring associated with the other brush.
  • a brush holder assembly including, in combination, a double brush holder, tandem brushes slidable therein, a pressure applying spiral spring for each brush having an extension extending over the top of both brushes, said brush holder being slotted to allow the said extension to follow the brushes as they wear, and each of said brushes having a step on the top face thereof so as to clear the extension of the spiral spring associated with the other brush, and a stiffening member attached to said extension.
  • a brush holder assembly including, in combination, a double brush holder, tandem brushes slidable therein, a pressure applying spiral spring for each brush having an extension extending over the top of both brushes, said brush holder being slotted to allow the said extension to follow the brushes as they wear, and each of said brushes having a step on the top face thereof so as to clear the extension of the spiral spring associated with the other brush, a stiffening member attached to said extension, and a flexible braid providing an electrical connection between said extension and said brush holder.
  • a brush holder assembly including, in combination, a double brush holder, tandem brushes slidable therein, and a pressure applying spiral spring having an extension extending over the top of both brushes, said extension being slotted lengthwise so as to form two spring fingers each engaging one brush only, said brush holder being slotted to allow said spring fingers to follow the respective brushes as they wear, and each of said brushes having a step on the top face thereof so as to clear the spring finger associated with the other brush.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
US790716A 1958-02-11 1959-02-02 Brush holders for dynamo electric machines Expired - Lifetime US2964663A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4495/58A GB879469A (en) 1958-02-11 1958-02-11 Improvements relating to brush gear assemblies for dynamo electric machines

Publications (1)

Publication Number Publication Date
US2964663A true US2964663A (en) 1960-12-13

Family

ID=9778259

Family Applications (1)

Application Number Title Priority Date Filing Date
US790716A Expired - Lifetime US2964663A (en) 1958-02-11 1959-02-02 Brush holders for dynamo electric machines

Country Status (5)

Country Link
US (1) US2964663A (fr)
CH (1) CH353076A (fr)
DE (1) DE1127459B (fr)
FR (1) FR1215470A (fr)
GB (1) GB879469A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146365A (en) * 1960-11-14 1964-08-25 Gen Motors Corp Electrical machinery brush holder
US3206329A (en) * 1962-01-08 1965-09-14 Gen Electric Insulation coating for indirectly heated cathode heaters
US3816783A (en) * 1970-10-07 1974-06-11 Hitachi Ltd Compound spring arrangement for brush holders of rotary electric machines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US426471A (en) * 1890-04-29 Brush and holder for electrical machines
GB376891A (en) * 1931-05-18 1932-07-21 Gen Electric Co Ltd Improvements in or relating to brush holders for dynamo-electric machines
US1936422A (en) * 1931-09-24 1933-11-21 Gen Electric Double brush holder
US2838704A (en) * 1956-02-14 1958-06-10 Fairbanks Morse & Co Brush guard for brush holder units

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE586176C (de) * 1931-08-06 1933-10-18 Schunk & Ebe Tandembuerstenhalter
GB412339A (en) * 1933-02-14 1934-06-28 Willis Orr Improvements relating to brush gear for dynamo electric machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US426471A (en) * 1890-04-29 Brush and holder for electrical machines
GB376891A (en) * 1931-05-18 1932-07-21 Gen Electric Co Ltd Improvements in or relating to brush holders for dynamo-electric machines
US1936422A (en) * 1931-09-24 1933-11-21 Gen Electric Double brush holder
US2838704A (en) * 1956-02-14 1958-06-10 Fairbanks Morse & Co Brush guard for brush holder units

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146365A (en) * 1960-11-14 1964-08-25 Gen Motors Corp Electrical machinery brush holder
US3206329A (en) * 1962-01-08 1965-09-14 Gen Electric Insulation coating for indirectly heated cathode heaters
US3816783A (en) * 1970-10-07 1974-06-11 Hitachi Ltd Compound spring arrangement for brush holders of rotary electric machines

Also Published As

Publication number Publication date
FR1215470A (fr) 1960-04-19
GB879469A (en) 1961-10-11
DE1127459B (de) 1962-04-12
CH353076A (fr) 1961-03-31

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