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US3577025A - Clip for carbon brushes - Google Patents

Clip for carbon brushes Download PDF

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Publication number
US3577025A
US3577025A US735348A US3577025DA US3577025A US 3577025 A US3577025 A US 3577025A US 735348 A US735348 A US 735348A US 3577025D A US3577025D A US 3577025DA US 3577025 A US3577025 A US 3577025A
Authority
US
United States
Prior art keywords
clip
segment
brush
assembly
members
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
US735348A
Other languages
English (en)
Inventor
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.)
NATIONAL ELECTRICAL CARBON 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
Application granted granted Critical
Publication of US3577025A publication Critical patent/US3577025A/en
Assigned to NATIONAL ELECTRICAL CARBON CORPORATION reassignment NATIONAL ELECTRICAL CARBON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UNION CARBIDE CORPORATION
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 clip for use with carbon brushes to form an assembly suitable to operate in electric equipment having at least two members, one of the members being provided with a resilient protruding segment. This segment moves to a position flush with the surface of the member to which it is secured while the clip is sliding into a groove in the carbon brush, and snaps back to its normal position when it engages a recess in the groove. With this construction, the clip is permanently secured to the brush.
  • 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 at the top of the brush by accommodating the spring finger or hammer. It is consequently often referred to as a hammer or finger clip.
  • a clip configuration A wide variety of clip configurations are currently in use. In addition, several types of constructions are presently used to secure the clip to the brush.
  • a typical clip configuration and connection is illustrated in Publication No. CBl-l96l published in Oct. 1961 by the National Electric Manufacturers Association and referred to therein as an A" clip.
  • This assembly consists 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 between the rivet head and the brush.
  • US. Pat. No. 3,355,6I1 solves the aforementioned problems by providing a brush-clip assembly which does not depend upon a rivet or other fastener to secure the components together.
  • the assembly includes a nonmetallic clip which is interlockingly secured to the brush in a groove at the side of the brush.
  • US. Pat. No. 1,490,307 advocates a generally U-shaped metallic clip which is positioned into undercut notches in the sides of the brush and held in place by the spring tension on the clip itself.
  • US. Pat. No. 3,017,529 discloses a clip or cap which is laminated, the lower lamination being made of neoprene or other rubber composition while the top layer material is a suitable material to prevent breakage in operation.
  • the clip is secured to the top of the brush by being positioned in an angled dovetail slot placed in the top surface of the brush.
  • the present invention provides a novel clip for use in such an assembly, the clip being constructed such that it is easily and permanently secured to the brush.
  • the clip of the invention comprises two members secured together, one of the members having a protruding segment extending from a portion thereof.
  • the protruding segment is designed so that it is positioned flush with and substantially parallel to the member of which it is a part in response to a pressure applied during installation on the brush and returns to its normal projecting position upon the release of pressure.
  • the protruding segment is, in the preferred embodiment, constructed of a resilient material which .will yield under the pressures applied in assembly and will springback" when pressure is relieved.
  • FIG. 1 is an isometric view of a brush-clip assembly typical h w nysmi n V
  • FIG. 2 illustrates a brush prior to the insertion of the clip of the invention
  • FIG. 3 is a side view, partially in section, of a split-wafer brush positioned under the clip of the invention
  • FIG. 4 is a front elevational view of a clip typical of the invention.
  • FIG. 6 is an illustration of another embodiment of the clip of the invention.
  • FIG. 7 is an enlarged fragmentary view of the section.7 of FIG. 3.
  • FIG. 1 a brush-clip assembly designated generally by the numeral 10.
  • the assembly comprises a clip 12 and a brush 14.
  • the clip 12 includes a first member 16 having a protruding segment 18 and a second member 20 substantially at a right angle relative to the first member 16.
  • the member 16 resides in a groove 22 in the side of the brush while the member 20 extends across the top of the brush to provide a riding surface for the spring finger (not shown).
  • FIG. 2 the groove 22 in brush 14 is more clearly illustrated.
  • a recess 24 is placed at about the center of the groove to accommodate the segment 18 of the clip.
  • the groove is designed to retain the clip and is therefore shown as being dovetailed and is also preferably designed to provide a relatively close fit with the clip.
  • the pressure of the groove wall during assembly against the protruding segment causes the segment to recede to a position flush with the surface of the clip to which it is affixed while the clip is being pressed into the groove.
  • the protruding segment springs into the recess.
  • the clip is then permanently locked into position. This is shown clearly in FIG. 3 and FIG. 7.
  • FIG. 3 also illustrates that a plurality of brushes (i.e. brush 28) can be placed beneath the clip when required.
  • FIG. 4 depicts the clip 20 in a front elevation view while FIG. 5 shows the same clip in cross section.
  • the member 20 normally forms an included angle A of about 45, 75 and with member 16 as shown. This angle could be varied to conform to the contour of the brush top or vary in accordance with the design of the particular clip configuration employed.
  • the clip members are normally made an integral unit during the fabrication of the clip. However, any sturdy mechanical connection between members which can withstand the vibrational forces experienced during operation of the system is acceptable for the purposes of this invention.
  • the protruding segment must be composed of a material with sufficient resiliency to permit it to yield substantially the total amount of its projected distance and spring back to its original position.
  • This projected distance is shown by the letter d in FIG. 5 and it will vary according to the size of clip employed. Normally, the degree of extension d is generally of a magnitude of about 0.040 inch.
  • Materials which have displayed sufficient resiliency are polypropylene, nylon, plastics in general, fibre glass,
  • FIG. 5 is a sectional view view taken along lines 5-5 in FIG.
  • Teflon,* Nylafil molded fibers, hard rubber or metals.
  • Suitable metals are steel, steel alloys, aluminum in the most advantageous embodiment, an integral part of the clip.
  • any means of attachment such as fusion bonding will suffice provided that the desired springback function of the segment is maintained and the segment is strong enough to permanently secure the clip to the brush.
  • the angle of projection of the protruding segment relative to the clip member of which it is a part is generally not critical, it has been observed that a stronger shock resistant unit is obtained if the segment forms an angle of about 5 with the longitudinal axis of the clip member as shown by the letter B in FIG. 5.
  • FIG. 6 displays another embodiment of the clip of the i nv ention.
  • the clip is in the form of a U configuration with members 30,32,34, all integrally formed together.
  • the extended segment 36 is integrally secured to member 30 while segment 38 is similarly secured to member 34.
  • a plurality of brushes can be placed between members 30,34 segments 36, 38 fitting into brush recesses in the outermost brushes during assembly.
  • a clip similar to that shown in FIG. 5 composed entirely of Nylafil was molded into a single unit having the following dimensions: a first dovetailed member (No. 16 in FIG. 5) was 0.090 inch thick, 0.375 inch wide and 0.625 inch high as measured to the lower surface of the second member at the joint between members. A protruding segment extending a distance d of 1/32 inch was 0.042 inch thick and /6 inch wide. The top of the segment was positioned 0.230 inch from the aforementioned lower surface of the second member and the segment was substantially centered relative to the width of the first member. The second or top member formed an angle of 75 with the first member and projected a distance of 0.493 inch. This member was 0.060 inch thick and 0.375 inch wide.
  • the clip was placed in a dovetailed groove 0.375 inch wide by 0.625 inch long by 0.115 inch deep.
  • the pressure exerted against the protruding segment by the groove wall when the clip was pressed into the groove caused the segment to seek a position flush with the surface of the first member.
  • a recess was machined into the groove, the top of the recess being positioned 0.220 inch from the top of the brush.
  • a number of brush-clip assemblies of the type described in the example were tested for vibration and all withstood at least 15 million vibrations without loosening.
  • the temperature of the clips was varied during the testing to simulate operating conditions. None of the clip assemblies failed in operation.
  • the protruding segment can be affixed to the clip member by a hingeable securing means such as a pin and spring tension can be effected by a device such as a spring coil, leaf spring, cushion pad or the like positioned behind the segment.
  • a hingeable securing means such as a pin
  • spring tension can be effected by a device such as a spring coil, leaf spring, cushion pad or the like positioned behind the segment.
  • This type of construction is less desirable than the aforementioned preferred embodiment since it is more expensive to manufacture.
  • Other modifications within the purview of this invention include different clip shapes such as a T clip; clip members which are laminated with suitable materials, particularly the top member; brush grooves which are enclosed on all sides such that a slot is formed in the top of surface of said first member when pressure is applied to said segment and returned to its orrgrna positron upon release of such pressure.
  • said protruding segment is composed of a material selected from a group comprising nylon, Nylafil, plastic, fiberglass and resilient metals.
  • segment and said members are an integral unit and are composed of a material selected from a group comprising nylon, Nylafil, plastic, fiberglass and resilient metals.
  • a clip for use in an electric brush assembly comprising:
  • a brush-clip assembly comprising:
  • a clip having a least two members, said members being secured together and forming an angle of between about 45 and about 90 therebetween, at least one of said members having a protruding segment extending therefrom, having means to move said segment substantially flush with the surface of said segment substantially flush with the surface of said member when pressure is applied to said segment and to release said segment when pressure is removed, and having a cross-sectional area designed for sliding into a mating groove in a brush so that said member can be retained therein;
  • a carbonaceous brush said brush having a groove in at least one sidewall thereof for receiving the member having said protruding segment, and having a recess in said sidewall within said groove so that when said clip member is positioned into said groove, the protruding segment will project into said recess and firmly secure the clip to said brush.

Landscapes

  • Clamps And Clips (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Installation Of Indoor Wiring (AREA)
  • Brushes (AREA)
  • Insertion Pins And Rivets (AREA)
US735348A 1968-06-07 1968-06-07 Clip for carbon brushes Expired - Lifetime US3577025A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US73534868A 1968-06-07 1968-06-07

Publications (1)

Publication Number Publication Date
US3577025A true US3577025A (en) 1971-05-04

Family

ID=24955388

Family Applications (1)

Application Number Title Priority Date Filing Date
US735348A Expired - Lifetime US3577025A (en) 1968-06-07 1968-06-07 Clip for carbon brushes

Country Status (10)

Country Link
US (1) US3577025A (es)
AT (1) AT306843B (es)
BE (1) BE734079A (es)
CH (1) CH494484A (es)
DE (1) DE1928489A1 (es)
ES (2) ES172816Y (es)
FR (1) FR2010355A1 (es)
GB (1) GB1278294A (es)
NL (1) NL141040B (es)
SE (1) SE367517B (es)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784856A (en) * 1972-07-31 1974-01-08 Gen Electric Brush holder assembly
US3867659A (en) * 1973-08-06 1975-02-18 Gen Electric Brush holder assembly
US4748363A (en) * 1986-02-21 1988-05-31 Hitachi, Ltd. Current-collecting brush apparatus
US5642012A (en) * 1993-03-18 1997-06-24 Boggs, Iii; Paul Dewey Brush holder for use in electric motor
US20090066185A1 (en) * 2007-09-11 2009-03-12 Denso Corporation Commutator motor utilizing existing part to restrict radially outward movement of brush holders
WO2012113638A1 (de) * 2011-02-25 2012-08-30 Robert Bosch Gmbh Bürstenanordnung für eine elektrokraftstoffpumpe zum fördern elektrisch leitfähiger kraftstoffe

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7386792B1 (en) 2001-03-07 2008-06-10 Thomas Layne Bascom System and method for collecting, storing, managing and providing categorized information related to a document object
US7158971B1 (en) 2001-03-07 2007-01-02 Thomas Layne Bascom Method for searching document objects on a network
US6664701B1 (en) 2002-06-13 2003-12-16 Black & Decker Inc. Brush assembly
US6713916B1 (en) 2002-10-31 2004-03-30 Black & Decker Inc. Electric motor assembly
US6798109B2 (en) 2002-10-31 2004-09-28 Black & Decker Inc. Electric motor brush assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2295444A (en) * 1940-07-20 1942-09-08 United Carr Fastener Corp Fastener for handles and other installations
US2520379A (en) * 1947-04-28 1950-08-29 Superior Carbon Products Inc Brush support
FR1035208A (fr) * 1951-04-07 1953-08-19 Lorraine Carbone Perfectionnements aux balais pour machines électriques
US2706261A (en) * 1954-04-16 1955-04-12 Jack & Heintz Inc Brush retainer for rotating electrical machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2295444A (en) * 1940-07-20 1942-09-08 United Carr Fastener Corp Fastener for handles and other installations
US2520379A (en) * 1947-04-28 1950-08-29 Superior Carbon Products Inc Brush support
FR1035208A (fr) * 1951-04-07 1953-08-19 Lorraine Carbone Perfectionnements aux balais pour machines électriques
US2706261A (en) * 1954-04-16 1955-04-12 Jack & Heintz Inc Brush retainer for rotating electrical machines

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784856A (en) * 1972-07-31 1974-01-08 Gen Electric Brush holder assembly
US3867659A (en) * 1973-08-06 1975-02-18 Gen Electric Brush holder assembly
US4748363A (en) * 1986-02-21 1988-05-31 Hitachi, Ltd. Current-collecting brush apparatus
US5642012A (en) * 1993-03-18 1997-06-24 Boggs, Iii; Paul Dewey Brush holder for use in electric motor
US20090066185A1 (en) * 2007-09-11 2009-03-12 Denso Corporation Commutator motor utilizing existing part to restrict radially outward movement of brush holders
US8304954B2 (en) * 2007-09-11 2012-11-06 Denso Corporation Commutator motor utilizing existing part to restrict radially outward movement of brush holders
WO2012113638A1 (de) * 2011-02-25 2012-08-30 Robert Bosch Gmbh Bürstenanordnung für eine elektrokraftstoffpumpe zum fördern elektrisch leitfähiger kraftstoffe

Also Published As

Publication number Publication date
ES172816U (es) 1972-04-01
BE734079A (es) 1969-12-04
AT306843B (de) 1973-04-25
ES172816Y (es) 1973-01-16
GB1278294A (en) 1972-06-21
CH494484A (fr) 1970-07-31
SE367517B (es) 1974-05-27
ES174891U (es) 1972-05-16
FR2010355A1 (es) 1970-02-13
NL6907071A (es) 1969-12-09
DE1928489A1 (de) 1969-12-11
NL141040B (nl) 1974-01-15
ES174891Y (es) 1973-01-01

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Legal Events

Date Code Title Description
AS Assignment

Owner name: MORGAN GUARANTY TRUST COMPANY OF NEW YORK, AND MOR

Free format text: MORTGAGE;ASSIGNORS:UNION CARBIDE CORPORATION, A CORP.,;STP CORPORATION, A CORP. OF DE.,;UNION CARBIDE AGRICULTURAL PRODUCTS CO., INC., A CORP. OF PA.,;AND OTHERS;REEL/FRAME:004547/0001

Effective date: 19860106

AS Assignment

Owner name: UNION CARBIDE CORPORATION,

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:MORGAN BANK (DELAWARE) AS COLLATERAL AGENT;REEL/FRAME:004665/0131

Effective date: 19860925

AS Assignment

Owner name: NATIONAL ELECTRICAL CARBON CORPORATION,SOUTH CAROL

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UNION CARBIDE CORPORATION;REEL/FRAME:004685/0800

Effective date: 19861211

Owner name: NATIONAL ELECTRICAL CARBON CORPORATION, A DE. CORP

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNION CARBIDE CORPORATION;REEL/FRAME:004685/0800

Effective date: 19861211