US3355611A - Brush clip assembly - Google Patents

Brush clip assembly Download PDF

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Publication number
US3355611A
US3355611A US463275A US46327565A US3355611A US 3355611 A US3355611 A US 3355611A US 463275 A US463275 A US 463275A US 46327565 A US46327565 A US 46327565A US 3355611 A US3355611 A US 3355611A
Authority
US
United States
Prior art keywords
brush
clip
groove
assembly
top surface
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
US463275A
Other languages
English (en)
Inventor
Herbert H Meyer
Archie R Kingsbury
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.)
Union Carbide Corp
Original Assignee
Union Carbide 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 Union Carbide Corp filed Critical Union Carbide Corp
Priority to US463275A priority Critical patent/US3355611A/en
Priority to GB25063/66A priority patent/GB1116458A/en
Priority to BE682161D priority patent/BE682161A/xx
Priority to DE19661513840 priority patent/DE1513840A1/de
Priority to NL6607885A priority patent/NL6607885A/xx
Priority to CH841866A priority patent/CH445624A/fr
Priority to AT553066A priority patent/AT274124B/de
Priority to ES0327739A priority patent/ES327739A1/es
Application granted granted Critical
Publication of US3355611A publication Critical patent/US3355611A/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
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/26—Solid sliding contacts, e.g. carbon brush

Definitions

  • a brush clip assembly comprising a brush of the type conventionally employed in electrical devices such as motors and generators, and a non-metallic clip interlockingly secured to the brush to prevent wear thereto by accommodating a spring finger.
  • the brush is provided with agroove confined. to a side surface thereof and having an opening in the top surface, and the clip is formed such that one segment is inserted into and extends along the groove and one segment extends across the top surface of the brush.
  • This invention relates to an electric brush and more particularly to an improved brush clip assembly.
  • a brush clip is a component which is attached to an electric brush of the type conventionally employed in certain electrical devices such as motors and generators. It is used to prevent wear of the brush by accommodating the spring finger or hammer and to act as a guide and is consequently often referred to as a hammer or finger clip.
  • a wide variety of clip configurations are available.
  • several types of connections are presently used to secure the clip to the brush.
  • a typical clip configuration and connection is that illustrated in Publication No. OBI-1961 published in October 1961 by the National Electric Manufacturers Association and referred to therein as A clip.
  • This assemblycon sists generally of a metal strip bent so as to lie on top of the brush and connected to the side of the brush by. one or more rivets.
  • This particular assembly generally includes a metal washer be tween the rivet head and the brush.
  • a furtherv objectof this invention is to provide a brush clip assembly which does not depend upon a rivet or similar fastener to secure the clipto' the brush and yet 'may be readily employed with a split brush.
  • Still another object of this invention is to provide a brush clip assembly which is sturdy, inexpensive, and requires a minimum of skill to assemble.
  • FIGURE 1 is an isometric view of the brush clip assembly of the invention
  • FIGURE 2 is an isometric view of a typical brush having a dovetailed groove therein.
  • FIGURE 3 is an isometric view of the brush clip assembly of the invention wherein a split brush is illustrated.
  • a brush clip assembly comprising a carbon or graphite or metal graphite brush having a groove machined in one side thereof, and a generally L shaped clip engaging the groove in such a manner as to be interlockingly secured to the brush.
  • the extended portion of the clip is designed to extend parallel with the top surface of the brush and if desired beyond the width edge of the brush.
  • the bush clip assembly of the invention may best be described by referring to the drawing and particularly FIGURE 1.
  • the carbon or graphite brush 10 has a groove 12 machined along the side surface 14.
  • the groove begins at the top surface 16 which is opposite the con tact surface 18, and terminates at a determined distance from the top surface 'along the side surface 14 at point 20.
  • a clip 22 is positioned within the groove 12. The clip preferably extends beyond the top surface 16 of the brush 10.
  • the groove 12 and the clip 22 are designed so that a secure connection exists between them when the assembly is made. This is accomplished by providing an in terlocking arrangement between clip and groove such as an interference fit relationship.
  • the groove may be dovetailed, or undercut with a correspondingly shaped clip inserted therein. By way of illustration, a half inch wide clip is secured in the groove if an interference of 0.005 inch is provided.
  • FIGURE 2 illustrates a dovetailed groove 12 which may be employed in the assembly of the invention. It will be noted that the groove suitably extends into the top surface 16 of the brush a distance d which in all cases is equal to or greater than the thickness of the clip used.
  • asplit brush comprises brushes 10 and 24.
  • a clip 22 resides in the groove 12 (not shown) in brush 10 and extends beyond the top surface 16 so as to cover a portion of the top surface 26 of the brush 24.
  • the clip 22 serves as a guide for brush 24 as well as accommodating the spring finger (not shown) to prevent wear of the brush.
  • the clip 22 be inserted into the groove 12 at the top 16 and a slight pressure he applied.
  • the clip width should be sufiiciently wide or of such edge angle as to provide initial interference upon insertion.
  • the clip may be composed of any suitable non-metallic material, it must be composed'of a material having a thermal coefficient of expansion-greater than that of the brush material.
  • a plastic (or equivalent), clip material is advantageous because it can withstand the shock, vibration, and wear to which it is subjected, and it will not cause a short circuit or other electrical damage upon breaking since it is electrically non-conductive.
  • the two brush halves Will conduct substantially the same current. This is believed to be due to the improved riding properties of the non-metallic clip whenlin contact with metal spring finger. Commutation will also be improved due to the resiliency of plastic or equivalent material.
  • Several equivalent materials which may be used in the construction of the clip are elastomeric materials in general, polypropylene, nylon, Nylafil Operaon and fibre glass, and molded fibres as well as other similar materials.
  • a small hole could be drilled near the bottom of the groove and the clip could be fpunched to form a dimple in the predrilled hole thereby giving a substitute or supplemental connecting characteristic to the assembly.
  • the preferred dovetail groove could be replaced by an undercut-groove and a correspondingly shaped clip.
  • the clip is normally preformed and then inserted intothe groove it could be molded directly into the groove.
  • the clip configuration illustrated herein is preferred, similar success may be accomplished if the clip is longer or shorter, wider or narrower, or is formed intoa larger or smaller angle. Better results are obtained it the-bottom Number vibrations, millions Material Clip temp.
  • connection of the invention becomes stronger under normal operating conditions and this is contrary to the performance of prior art connections.
  • the increase in strength- is due to the factthat the forces operating on the clip tendto augment the secure mechanical relationship of the clip and the groove.
  • the clip since the clip is composed of a material. having a. higher thermal coefficient of expansion than the brush, it will expand during operation due to the heat rise in the surrounding equipment and atmos- Nylafi1-Registered trademark of Fiberfil Corporation, Warsaw, Incl, and the subject of U.S'. Patent No. 2,877,501- a combination of nylon and fibre glass.
  • a brush clip assembly comprising at least. one brush,v said brush haing a. contact surface, a top surface opposite said contact surface, and a side surface between said contact surface and said top surface, saidbrush having a groove with an opening at said top surface and extending solely along said side surface; and a nonmetallic clip having a: coetficient of thermal expansion greater thanthat of said brush residing in said groove, said clip being so formed such that one segment thereof is inserted into and extends along said groove, and. one segment thereof extends across said top surface, said groove and said clip being structured such that said clip 6.
  • said clip is composed of Nylafil.
  • a brush clip assembly comprising a first brush having a contact surface, a top surface opposite said contact surface, and a side surface between said contact surface and said top surface, said first brush having a groove with an opening at said top surface and extending solely along said side surface; a nonmetallic clip having a greater coefiicient of thermal expansion than that of said brush residing in said groove, said clip being so formed such that one segment thereof is inserted into and extends along said groove, and one segment thereof clip being structured such that said clip is interlockingly secured to said first brush; and a second brush electrically connected to said first brush and so positioned as to reside beneath at least a portion of said clip.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
  • Clamps And Clips (AREA)
US463275A 1965-06-11 1965-06-11 Brush clip assembly Expired - Lifetime US3355611A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US463275A US3355611A (en) 1965-06-11 1965-06-11 Brush clip assembly
BE682161D BE682161A (enrdf_load_stackoverflow) 1965-06-11 1966-06-06
DE19661513840 DE1513840A1 (de) 1965-06-11 1966-06-06 Clip fuer Elektroden-Kohlen
GB25063/66A GB1116458A (en) 1965-06-11 1966-06-06 Improvements in or relating to brushes
NL6607885A NL6607885A (enrdf_load_stackoverflow) 1965-06-11 1966-06-07
CH841866A CH445624A (fr) 1965-06-11 1966-06-10 Balai de contact électrique
AT553066A AT274124B (de) 1965-06-11 1966-06-10 Bürstengarnitur
ES0327739A ES327739A1 (es) 1965-06-11 1966-06-10 Una disposicion de escobilla y grapa para dispositivos electricos.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US463275A US3355611A (en) 1965-06-11 1965-06-11 Brush clip assembly

Publications (1)

Publication Number Publication Date
US3355611A true US3355611A (en) 1967-11-28

Family

ID=23839535

Family Applications (1)

Application Number Title Priority Date Filing Date
US463275A Expired - Lifetime US3355611A (en) 1965-06-11 1965-06-11 Brush clip assembly

Country Status (8)

Country Link
US (1) US3355611A (enrdf_load_stackoverflow)
AT (1) AT274124B (enrdf_load_stackoverflow)
BE (1) BE682161A (enrdf_load_stackoverflow)
CH (1) CH445624A (enrdf_load_stackoverflow)
DE (1) DE1513840A1 (enrdf_load_stackoverflow)
ES (1) ES327739A1 (enrdf_load_stackoverflow)
GB (1) GB1116458A (enrdf_load_stackoverflow)
NL (1) NL6607885A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5485049A (en) * 1994-05-25 1996-01-16 United Technologies Motor Systems, Inc. Multi-speed motor
US20050253477A1 (en) * 2002-06-13 2005-11-17 Black & Decker Inc. Brush assembly
US20080100170A1 (en) * 2006-09-29 2008-05-01 Herbert Rehm Carbon brush with wear-protecting means

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1490307A (en) * 1921-11-07 1924-04-15 Becker Bros Brush for electrical apparatus and method of making same
US2796544A (en) * 1954-07-19 1957-06-18 Stanley A Silverman Brush adapter for dynamoelectric machines
US2923842A (en) * 1957-01-23 1960-02-02 Walter O Helwig Electric brushes for electric motors and generators
US3017529A (en) * 1960-06-09 1962-01-16 Walter O Helwig Electric brushes for electric motors and generators

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1490307A (en) * 1921-11-07 1924-04-15 Becker Bros Brush for electrical apparatus and method of making same
US2796544A (en) * 1954-07-19 1957-06-18 Stanley A Silverman Brush adapter for dynamoelectric machines
US2923842A (en) * 1957-01-23 1960-02-02 Walter O Helwig Electric brushes for electric motors and generators
US3017529A (en) * 1960-06-09 1962-01-16 Walter O Helwig Electric brushes for electric motors and generators

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5485049A (en) * 1994-05-25 1996-01-16 United Technologies Motor Systems, Inc. Multi-speed motor
US5594290A (en) * 1994-05-25 1997-01-14 United Technologies Motor Systems, Inc. Commutator brush
US20050253477A1 (en) * 2002-06-13 2005-11-17 Black & Decker Inc. Brush assembly
US20080100170A1 (en) * 2006-09-29 2008-05-01 Herbert Rehm Carbon brush with wear-protecting means

Also Published As

Publication number Publication date
NL6607885A (enrdf_load_stackoverflow) 1966-12-12
AT274124B (de) 1969-09-10
BE682161A (enrdf_load_stackoverflow) 1966-12-06
CH445624A (fr) 1967-10-31
GB1116458A (en) 1968-06-06
ES327739A1 (es) 1967-03-16
DE1513840A1 (de) 1969-06-19

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