US3863085A - Brush for electric machines - Google Patents

Brush for electric machines Download PDF

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Publication number
US3863085A
US3863085A US304829A US30482972A US3863085A US 3863085 A US3863085 A US 3863085A US 304829 A US304829 A US 304829A US 30482972 A US30482972 A US 30482972A US 3863085 A US3863085 A US 3863085A
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United States
Prior art keywords
brush
spring
fittings
current
electric machines
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Expired - Lifetime
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US304829A
Inventor
Aron Beniaminovich Shapiro
Vladimir Pavlovich Chernyavsky
Ibragim Akhmedovich Kadi-Ogly
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Individual
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Individual
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Priority to US304829A priority Critical patent/US3863085A/en
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    • 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
    • H01R39/36—Connections of cable or wire to brush

Definitions

  • ABSTRACT Brush for electric machincs comprising a brush body made of carbon, current-carrying fittings, and a spring insulated from the brush body and serving to press the latter against the fittings.
  • the spring may be a flat or a spiral spring; in the latter case a separate'pressure element may be interposed.
  • brushes for electric machines which comprise a brush body proper, a carbon or graphite rod, and current-carrying fittings with a current-bearing wire affixed thereto.
  • This kind of attachment has the following disadvantages: liability to loosening of the bolt connection during vibration of the brush, resulting in worsening of the electrical and thermal contact between the brush and the fittings, and also inconvenient mounting and dismantling of the brush due to the necessity of locking the bolt in the tightened condition.
  • a brush for electric machines comprising current-carrying fittings attached to the brush body by means of a spring, wherein the brush is so formed, according to the invention, that one end of the spring is secured to the current-carrying fittings, whereas the other end preferably carries a pressure element secured thereto, while the brush body, due to the action of the spring, is pressed between the current-carrying fittings and the pressure element, at least the brush spring being insulated from the brush body.
  • an open through slot is made in the brush body, and a spirally threaded hole is made in the current-carrying fittings along the axis of the slot, a screw is screwed into said latter hole from the outside to release the spring.
  • the spring which presses the brush body between the current-carrying fittings and the pressure element can be made in the form of a coil tension spring positioned in the brush slot.
  • the above mentioned spring takes the form of a flat spring whose one end is combined with the pressure element.
  • FIG. 1 is a longitudinal section of a first exemplary form of a brush for electric machines, according to the invention
  • FIG. 2 is a side view of the same, partly sectionalized
  • FIG. 3 is a longitudinal section of another exemplary form of a brush for electric machines. according to the invention.
  • FIG. 4 is a side view of the same. partly sectionalized.
  • FIGS. 1 and 2 an exemplary brush for electric machines is shown, comprising currentcarrying fittings 2 attached to a graphite body 3 of a brush 1 by means of a coil latter 4.
  • the spring is screwed with one end into a threaded hole 5 made in the current-carrying fittings 2, whereas the other end of the spring 4 is applied onto a screw 6 which performs the function ofa pressure element.
  • the spring 4 presses the body 3 of the brush 1 between the current-carrying fittings 2 and the head of the screw 6.
  • the spring is insulated from the brush 1 by means of a washer 7 and a pipe 8, both made of an insulating material, the spring 4 being inclosed in said pipe.
  • a through slot 9 is made in the graphite body 3 of the brush 1, which slot accommodates the coil spring 4.
  • the graphite body 3 of the brush 1 is pressed between the current-carrying fittings 2 and a flat spring 10 which is secured to said fittings and carries a pressure element ll secured to its end. Slots 12 are made in the graphite body 3 of the brush 1 to fix in position the current-carrying fittings 2 and the free end of the spring 10.
  • the pressure element takes the shape of a strip made of an insulating material. with the aim of preventing electric current flow through the flat spring 10 to preclude heating thereof.
  • Convenient handling of the graphite body 3 of the brush 1 is effected by a specially provided fixture (not shown) having a spirally threaded working part.
  • the fixture is screwed into the hole 5 in the current-carrying fittings and into the spring 4, thus extending the latter upon which the body 3 of the brush 1 can easily be removed and replaced with another one, if
  • the fixture is screwed into the hole 5 and presses off the flat spring 10, thus releasing the body 3 of the brush 1.
  • the above disclosed brushes for electric machines provide for a simple and reliable fastening of the brush and also for easy replacement of the graphite body of the brush.
  • a brush for electric machines to provide electric contact with a moving part of a machine comprising a brush body made of carbon and having an open through slot; current-carrying fittings on said body and having therein a threaded opening; and a spiral tension spring located in said slot, one end of said spring being 4 brush body made of carbon; current-carrying fittings; and a flat spring, one end of the latter being attached to said fittings; and spring being insulated from said brush body, the latter being held between said fittings and the free end of said spring.

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  • Motor Or Generator Current Collectors (AREA)

Abstract

Brush for electric machines, comprising a brush body made of carbon, current-carrying fittings, and a spring insulated from the brush body and serving to press the latter against the fittings. The spring may be a flat or a spiral spring; in the latter case a separate pressure element may be interposed.

Description

United States Patent 1 1 Shapiro et al.
BRUSH FOR ELECTRIC MACHINES r j: My: f Z f? 14 1 Jam-28, 1975 1.698.799 1/1929 Leland 310/240 1,756,692 4/1930 310/240 2.475.270 6/1949 Briggs 310/240 2.013.200 11/1957 Rittcr; 310/247 3075.1 10 1/1903 Pcpworth 310/240 3.482.135 12/1909 Hurlin 310/239 Primary Iiraminer-R. Skudy Attorney. Agent. or Firn1Wuters, Roditi. Schwartz & Nisscn [57] ABSTRACT Brush for electric machincs, comprising a brush body made of carbon, current-carrying fittings, and a spring insulated from the brush body and serving to press the latter against the fittings. The spring may be a flat or a spiral spring; in the latter case a separate'pressure element may be interposed.
2 Claims, 4 Drawing Figures 1 BRUSH FOR ELECTRIC MACHINES The present invention relates to electric machines and more specifically to brushes for electric machines.
Known in the art are brushes for electric machines, which comprise a brush body proper, a carbon or graphite rod, and current-carrying fittings with a current-bearing wire affixed thereto.
Also known in the art is a brush (cf., USSR Inventors certificate No. 208 I) with split current-carrying fittings, wherein the latter are secured to the brush by a bolt passing through a hole made in the brush.
This kind of attachment has the following disadvantages: liability to loosening of the bolt connection during vibration of the brush, resulting in worsening of the electrical and thermal contact between the brush and the fittings, and also inconvenient mounting and dismantling of the brush due to the necessity of locking the bolt in the tightened condition.
Another brush is known in the art (cf. French patent No. 1469006). Herein, the current-carrying fittings are not secured to the brush, but only pressed to it in the course of operation by means of a spring, which latter simultaneously presses the brush against the surface of the rotor. These brushes can be employed for relatively light currents, because the pressure exerted on the brush for its pressing against the rotating surface is relatively light, 0.l0.2 kglcm and therefore not able to effect a reliable contact between the fittings and the brush at heavy currents. Beside that, the fact that the brush is not secured to the fixtures creates a substantial inconvenience in installing and removing the brush from the brush holder.
It is therefore a general object of the invention to obviate the disadvantages inherent in the above described prior-art brushes for electric machines.
It is a specific object of the invention to provide a brush for electric machines with a split attachment of current-carrying fittings, providing for a reliable electrical and thermal contact between said fittings and the brush body proper, and also permitting convenient and quick assembly of the brush with the fittings and allowing the latter to be used repeatedly.
These and other objects are achieved by the provision of a brush for electric machines, comprising current-carrying fittings attached to the brush body by means of a spring, wherein the brush is so formed, according to the invention, that one end of the spring is secured to the current-carrying fittings, whereas the other end preferably carries a pressure element secured thereto, while the brush body, due to the action of the spring, is pressed between the current-carrying fittings and the pressure element, at least the brush spring being insulated from the brush body.
It is expedient that an open through slot is made in the brush body, and a spirally threaded hole is made in the current-carrying fittings along the axis of the slot, a screw is screwed into said latter hole from the outside to release the spring.
The spring which presses the brush body between the current-carrying fittings and the pressure element can be made in the form of a coil tension spring positioned in the brush slot.
It is however contemplated by the invention that the above mentioned spring takes the form of a flat spring whose one end is combined with the pressure element.
In order that the invention may be more clearly understood actual, exemplary embodiments of a brush for electric machine will now be fully described with reference to the accompanying drawings, of which:
FIG. 1 is a longitudinal section of a first exemplary form of a brush for electric machines, according to the invention;
FIG. 2 is a side view of the same, partly sectionalized;
FIG. 3 is a longitudinal section of another exemplary form of a brush for electric machines. according to the invention; and
FIG. 4 is a side view of the same. partly sectionalized.
Referring now to FIGS. 1 and 2, an exemplary brush for electric machines is shown, comprising currentcarrying fittings 2 attached to a graphite body 3 of a brush 1 by means of a coil latter 4. The spring is screwed with one end into a threaded hole 5 made in the current-carrying fittings 2, whereas the other end of the spring 4 is applied onto a screw 6 which performs the function ofa pressure element. The spring 4 presses the body 3 of the brush 1 between the current-carrying fittings 2 and the head of the screw 6.
To avoid heating of the coil spring 4 by the electric current, the spring is insulated from the brush 1 by means of a washer 7 and a pipe 8, both made of an insulating material, the spring 4 being inclosed in said pipe.
For more convenient mounting and fixing the position of the current-carrying fittings 2, a through slot 9 is made in the graphite body 3 of the brush 1, which slot accommodates the coil spring 4.
In another embodiment of the brush 1 for electric machines (FIGS. 3, 4), the graphite body 3 of the brush 1 is pressed between the current-carrying fittings 2 and a flat spring 10 which is secured to said fittings and carries a pressure element ll secured to its end. Slots 12 are made in the graphite body 3 of the brush 1 to fix in position the current-carrying fittings 2 and the free end of the spring 10.
In this brush 1, the pressure element takes the shape of a strip made of an insulating material. with the aim of preventing electric current flow through the flat spring 10 to preclude heating thereof. Convenient handling of the graphite body 3 of the brush 1 is effected by a specially provided fixture (not shown) having a spirally threaded working part.
In the first form of the brush for electric machines, illustrated in FIGS. 1, 2, wherein the coil spring 4 is employed, the fixture is screwed into the hole 5 in the current-carrying fittings and into the spring 4, thus extending the latter upon which the body 3 of the brush 1 can easily be removed and replaced with another one, if
necessary.
In the second brush form, illustrated in FIGS 3, 4, wherein the flat spring 10 is employed, the fixture is screwed into the hole 5 and presses off the flat spring 10, thus releasing the body 3 of the brush 1.
The above disclosed brushes for electric machines provide for a simple and reliable fastening of the brush and also for easy replacement of the graphite body of the brush.
What is claimed is:
l. A brush for electric machines to provide electric contact with a moving part of a machine, comprising a brush body made of carbon and having an open through slot; current-carrying fittings on said body and having therein a threaded opening; and a spiral tension spring located in said slot, one end of said spring being 4 brush body made of carbon; current-carrying fittings; and a flat spring, one end of the latter being attached to said fittings; and spring being insulated from said brush body, the latter being held between said fittings and the free end of said spring.

Claims (2)

1. A brush for electric machines to provide electric contact with a moving part of a machine, comprising a brush body made of carbon and having an open through slot; current-carrying fittings on said body and having therein a threaded opening; and a spiral tension spring located in said slot, one end of said spring being fixed in said threaded opening, while the other end of said spring is applied onto a pressure element; said spring and said pressure element being inSulated from said brush body, the latter being held tightly between said fittings and said pressure element.
2. A brush for electric machines to provide electric contact with a moving part of a machine, comprising a brush body made of carbon; current-carrying fittings; and a flat spring, one end of the latter being attached to said fittings; and spring being insulated from said brush body, the latter being held between said fittings and the free end of said spring.
US304829A 1972-11-08 1972-11-08 Brush for electric machines Expired - Lifetime US3863085A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4409508A (en) * 1981-05-11 1983-10-11 Hitachi, Ltd. Brush holder with coated clamp for dynamo-electric machine
US20110266914A1 (en) * 2001-12-18 2011-11-03 Cutsforth Products, Inc. Brush holder apparatus, brush assembly, and method
US11129336B2 (en) 2018-05-02 2021-09-28 Duratech Industries International, Inc. Dual rotor bale processor for producing forage material and bedding from bales of materials
US11996664B2 (en) 2020-12-01 2024-05-28 Cutsforth, Inc. Brush holder assembly
US12015229B2 (en) 2020-11-04 2024-06-18 Cutsforth, Inc. Brush holder assembly

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1666459A (en) * 1927-07-13 1928-04-17 George H Leland Brush-lifting mechanism for electric motors or the like
US1698799A (en) * 1927-07-13 1929-01-15 Leland Electric Co Brush-lifting mechanism for electric motors or the like
US1756692A (en) * 1928-09-04 1930-04-29 Leland Electric Co Brush-lifting mechanism for electric motors and the like
US2475276A (en) * 1947-10-01 1949-07-05 Leland Electric Co Brush lifting mechanism
US2813208A (en) * 1954-04-20 1957-11-12 George D Ritter Electrical contact brush
US3075110A (en) * 1959-01-28 1963-01-22 Ass Elect Ind Electric brush gear for holding and lifting
US3482135A (en) * 1967-10-30 1969-12-02 Ford Motor Co Brush assembly

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1666459A (en) * 1927-07-13 1928-04-17 George H Leland Brush-lifting mechanism for electric motors or the like
US1698799A (en) * 1927-07-13 1929-01-15 Leland Electric Co Brush-lifting mechanism for electric motors or the like
US1756692A (en) * 1928-09-04 1930-04-29 Leland Electric Co Brush-lifting mechanism for electric motors and the like
US2475276A (en) * 1947-10-01 1949-07-05 Leland Electric Co Brush lifting mechanism
US2813208A (en) * 1954-04-20 1957-11-12 George D Ritter Electrical contact brush
US3075110A (en) * 1959-01-28 1963-01-22 Ass Elect Ind Electric brush gear for holding and lifting
US3482135A (en) * 1967-10-30 1969-12-02 Ford Motor Co Brush assembly

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4409508A (en) * 1981-05-11 1983-10-11 Hitachi, Ltd. Brush holder with coated clamp for dynamo-electric machine
US9293881B2 (en) 2001-12-18 2016-03-22 Cutsforth, Inc. Brush holder apparatus, brush assembly, and method
US9293880B2 (en) 2001-12-18 2016-03-22 Cutsforth, Inc. Brush holder apparatus, brush assembly, and method
US8546993B2 (en) 2001-12-18 2013-10-01 Cutsforth, Inc. Brush holder apparatus, brush assembly, and method
US9287676B2 (en) 2001-12-18 2016-03-15 Cutsforth, Inc. Brush holder apparatus, brush assembly, and method
US9287675B2 (en) 2001-12-18 2016-03-15 Cutsforth, Inc. Brush holder apparatus, brush assembly, and method
US9287674B2 (en) 2001-12-18 2016-03-15 Cutsforth, Inc. Brush holder apparatus, brush assembly, and method
US8179014B2 (en) * 2001-12-18 2012-05-15 Cutsforth Products, Inc. Brush holder apparatus, brush assembly, and method
US20110266914A1 (en) * 2001-12-18 2011-11-03 Cutsforth Products, Inc. Brush holder apparatus, brush assembly, and method
US9293879B2 (en) 2001-12-18 2016-03-22 Cutsforth, Inc. Brush holder apparatus, brush assembly, and method
US9350130B2 (en) 2001-12-18 2016-05-24 Cutsforth, Inc. Brush holder apparatus, brush assembly, and method
US9590375B2 (en) 2001-12-18 2017-03-07 Cutsforth, Inc. Brush holder apparatus, brush assembly, and method
US10199790B2 (en) 2001-12-18 2019-02-05 Cutsforth, Inc. Brush holder apparatus, brush assembly, and method
US11129336B2 (en) 2018-05-02 2021-09-28 Duratech Industries International, Inc. Dual rotor bale processor for producing forage material and bedding from bales of materials
US12015229B2 (en) 2020-11-04 2024-06-18 Cutsforth, Inc. Brush holder assembly
US11996664B2 (en) 2020-12-01 2024-05-28 Cutsforth, Inc. Brush holder assembly

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