US1658677A - Brush for dynamo-electric machines - Google Patents

Brush for dynamo-electric machines Download PDF

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Publication number
US1658677A
US1658677A US206473A US20647327A US1658677A US 1658677 A US1658677 A US 1658677A US 206473 A US206473 A US 206473A US 20647327 A US20647327 A US 20647327A US 1658677 A US1658677 A US 1658677A
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United States
Prior art keywords
brush
dynamo
tip
soft
electric machines
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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
US206473A
Inventor
Max R Hanna
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US206473A priority Critical patent/US1658677A/en
Application granted granted Critical
Publication of US1658677A publication Critical patent/US1658677A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof

Definitions

  • My invention relates to brushes for inc-electric machines.
  • Soft graphitic carbon brushes of low resistance are desirable for use in dynamo-electrio machines when the current flow through the contact face of the brushes is of high density.
  • these brushes for the reason that they sometimes wear away rapidly and must be replaced.
  • brushes of this character improve commutation in railway car motors under certain operating conditions, but they have not been used because the commutators of such motors arelikely to become pitted and roughened so that the brushes would be worn away and the circuit to the motor interrupted before the car could be returned to the shop for repair.
  • the object of my invention is to provide a brush having a soft tip which will be satisfactory where the density of current flowing through the contact face of the brush is high, and having a hard portion arranged so that in the event the current collecting device should become roughened and the soft tip worn away that the hard portion of the brush will be brought intocontactwith the current collecting device, which prevents the brush being so worn as to interrupt the circuit to the machine in which it is used before the brushes are inspected in the usual course of operation.
  • my improved brush 10 comprises a soft graphitic carbon tip 10 and a hard carbon back 10".
  • the soft material of the tip 10 is selected with a view of giving good commutation when the machine employing the brush is heavily forming a part of loaded.
  • the hard back i0 is made of a material hard enough to rev sist wear and tends to smooth the current collecting device.
  • Good electrical conductivity of the brush is obtained preferably by moulding the soft tip- 10 and the hard back 10' integrally in the process of making the brush, which is carried out in the usual manner.
  • the soft tip and the hard back of the brush may be cemented together or joinedtogether mechanically in any suitable manner, as for example, by the use of any convenient metallic reinforcement.
  • the brush is supported in operative relation to the surface 11 of the current collec'ting device by a brush holder 12, of any suitable. form, having a spring 13 which exerts the desired brush pressure on the current collecting device.
  • the soft carbon tip 10 insures good commutation when heavy current flows through the contact face of the brush. Moreover, in the event the current collecting device should become roughened, although the soft tip away, yet the hard back l0 would be brought into contact with'the surface of the current collecting device. the brush resists being worn away by the roughened current collecting device and smooths the face of the commutator, so that the circuit to the machine is not interrupted before the brushes are inspected and replaced.
  • a brush for a dynamo-electric machine having a tipof soft material adapted to ear on a current collecting device, and a portion of hard material adjacent said tip adapted to form a contact face of the brush when the soft material is worn away.
  • a brush for a dynamo-electric machine having a tip of soft graphitic carbon, and a back of hard carbon united with said tip adapted to form a. contact face of the brush a" when said tip is worn away.

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  • Motor Or Generator Current Collectors (AREA)

Description

Feb. 7, 1928. 1,658,677
M. R. HANNA BRUSH FOR DYNAMO ELECTRIC MACHI NES Filed Julyl8, 1927 Inventor Max R. Hanna His Attorney Patented F cl). 7, 1928.
UNITED STATES PATENT OFFICE.
MAX R. HANNA, E ERIE, PENNSYLVANIA, ASSIGNOR TO GENERAL ELECTRIC COM- PANY, A CORPORATION OF NEW YORK.
BRUSH FOR DYNAMIC-ELECTRIC MACHINES.
Application filed July 18, 1927. Serial No. 206,478.
My invention relates to brushes for inc-electric machines.
Soft graphitic carbon brushes of low resistance are desirable for use in dynamo-electrio machines when the current flow through the contact face of the brushes is of high density. However, under some circumstances it has not been feasible to employ these brushes for the reason that they sometimes wear away rapidly and must be replaced. For example, brushes of this character improve commutation in railway car motors under certain operating conditions, but they have not been used because the commutators of such motors arelikely to become pitted and roughened so that the brushes would be worn away and the circuit to the motor interrupted before the car could be returned to the shop for repair.
The object of my invention is to provide a brush having a soft tip which will be satisfactory where the density of current flowing through the contact face of the brush is high, and having a hard portion arranged so that in the event the current collecting device should become roughened and the soft tip worn away that the hard portion of the brush will be brought intocontactwith the current collecting device, which prevents the brush being so worn as to interrupt the circuit to the machine in which it is used before the brushes are inspected in the usual course of operation.
My invention will be more fully set forth in thefollowing description referring to the accompanying drawing and the features of j novelty which characterize my invention will dynabe pointed out with particularity in the b claims annexed to and this specification.
The single figure of the drawing illustrates a brush made in accordance with my invention.
Referring to the drawing, my improved brush 10 comprises a soft graphitic carbon tip 10 and a hard carbon back 10". The soft material of the tip 10 is selected with a view of giving good commutation when the machine employing the brush is heavily forming a part of loaded. On the other hand the hard back i0 is made of a material hard enough to rev sist wear and tends to smooth the current collecting device. Good electrical conductivity of the brush is obtained preferably by moulding the soft tip- 10 and the hard back 10' integrally in the process of making the brush, which is carried out in the usual manner. However, the soft tip and the hard back of the brush may be cemented together or joinedtogether mechanically in any suitable manner, as for example, by the use of any convenient metallic reinforcement. The brush is supported in operative relation to the surface 11 of the current collec'ting device by a brush holder 12, of any suitable. form, having a spring 13 which exerts the desired brush pressure on the current collecting device.
During operation of a machine employing a brush of this form the soft carbon tip 10 insures good commutation when heavy current flows through the contact face of the brush. Moreover, in the event the current collecting device should become roughened, although the soft tip away, yet the hard back l0 would be brought into contact with'the surface of the current collecting device. the brush resists being worn away by the roughened current collecting device and smooths the face of the commutator, so that the circuit to the machine is not interrupted before the brushes are inspected and replaced.
What I claim as new and desire to secure by Letters Patent of the United States, is 1. A brush for a dynamo-electric machine having a tipof soft material adapted to ear on a current collecting device, and a portion of hard material adjacent said tip adapted to form a contact face of the brush when the soft material is worn away.
2. A brush for a dynamo-electric machine having a tip of soft graphitic carbon, and a back of hard carbon united with said tip adapted to form a. contact face of the brush a" when said tip is worn away.
In witness whereof, I have hereun o sci, my hand this 14 day of July, 1927.
MAX R. HANNA.
10 would be worn The back 10 of.
US206473A 1927-07-18 1927-07-18 Brush for dynamo-electric machines Expired - Lifetime US1658677A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US206473A US1658677A (en) 1927-07-18 1927-07-18 Brush for dynamo-electric machines

Applications Claiming Priority (1)

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US206473A US1658677A (en) 1927-07-18 1927-07-18 Brush for dynamo-electric machines

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US1658677A true US1658677A (en) 1928-02-07

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US206473A Expired - Lifetime US1658677A (en) 1927-07-18 1927-07-18 Brush for dynamo-electric machines

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591062A (en) * 1948-03-03 1952-04-01 Ibm Extrusion device and process
US3349210A (en) * 1965-08-06 1967-10-24 Int Research & Dev Co Ltd Electric contact brushes
US3351727A (en) * 1965-06-15 1967-11-07 Sarl Soc Lamy D Etudes Et De R Electrical brush support
US3392295A (en) * 1965-05-03 1968-07-09 Ametek Inc Electrical brush contacts
EP0165515A2 (en) * 1984-06-18 1985-12-27 Hitachi, Ltd. Sliding current collector

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591062A (en) * 1948-03-03 1952-04-01 Ibm Extrusion device and process
US3392295A (en) * 1965-05-03 1968-07-09 Ametek Inc Electrical brush contacts
US3351727A (en) * 1965-06-15 1967-11-07 Sarl Soc Lamy D Etudes Et De R Electrical brush support
US3349210A (en) * 1965-08-06 1967-10-24 Int Research & Dev Co Ltd Electric contact brushes
EP0165515A2 (en) * 1984-06-18 1985-12-27 Hitachi, Ltd. Sliding current collector
EP0165515A3 (en) * 1984-06-18 1987-04-01 Hitachi, Ltd. Sliding current collector

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