US2438510A - Electrical contact brush - Google Patents

Electrical contact brush Download PDF

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Publication number
US2438510A
US2438510A US547172A US54717244A US2438510A US 2438510 A US2438510 A US 2438510A US 547172 A US547172 A US 547172A US 54717244 A US54717244 A US 54717244A US 2438510 A US2438510 A US 2438510A
Authority
US
United States
Prior art keywords
brush
contact
pins
electrical contact
contact brush
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
US547172A
Other languages
English (en)
Inventor
Ernest S Mclarn
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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
Priority to BE465453D priority Critical patent/BE465453A/xx
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Priority to US547172A priority patent/US2438510A/en
Priority to GB13546/45A priority patent/GB595438A/en
Priority to CH253360D priority patent/CH253360A/de
Priority to FR926629D priority patent/FR926629A/fr
Application granted granted Critical
Publication of US2438510A publication Critical patent/US2438510A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H63/00—Details of electrically-operated selector switches
    • H01H63/02—Contacts; Wipers; Connections thereto
    • H01H63/04—Contact-making or contact-breaking wipers; Position indicators therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position

Definitions

  • My invention relates to electrical contact brushes and more particularly, although not exclusively, to brushes for selector switches for telecommunication systems.
  • An object of the invention l-s the provision oi acontact brush which when used in a telephone circuit does not give rise to microphonic noises and clicks: These noises are due largely to the movement of adjacent switches and the operation and release of associated clutch magnets. Building vibrations are' also the cause ofl clicks.
  • a contact brush comprises a pair of parallel spring members fixed to a supporting means at one end and separated at the other end by a small block of resilient material.v This block is located in the region where one of said spring members is provided with a contact surface for wipingover the contact terminals or pins.
  • the separating block of resilient material has the eilect of damping vibration of the spring members as they stand on contact pins on terminals and eilectively preventing microphonic noises in the telephone circuit.
  • Fig, '1 is a side elevation of a brush unit
  • Fig. 2 is a section taken on the line 2-2 of Fig. 1;
  • Fig. 3 isa section taken on the line 3-3 of Fig. 2 showing at A and B respectively the positions o'f the brush springs when making contact with a terminal pin and when between ad jacent terminal pins.
  • Fig. 4 is a side elevation oi the brush guide; gig. 5 is an end elevation of the brush guide; an l Fig. 6 is a section taken on the line 6--6 of Fig. 4.
  • the brush unit is supported ,on a molded brush carriage I bytwo pins 2 which are secured in -the carriage by Anuman my 2 9, 1944, serial No. 541.172
  • the brush unit comprises a punched fiber strip 4 provided with holes for the passage of vthe pins, 2 and to which are secured by rivets or eyelets 5 two outer phosphor bronze brush springs 6 and two inner brush springs 1.
  • pair of depending supports 8 for a brush guide l 9 is secured at each end oi the strip 4 by an eyelet I0.
  • the upper portions of the outer brush springs B are formed with lateral extensions II which are shaped to wipe over each side of a feederbar I2.
  • the lower ends of the inner brush springs 1 are formed with lateral contact surfaces adapted to wipe over the contact pins I3 in the bank, Winch pins arev made of a hard metal such as phosphor bronze or stainless steel.
  • the inner and outer brush springs 6 and 1 are in contact for the major portion of their length but near the tip the inner brush spring 1 is bent Y at an angle to form a space between the tips as shown in Fig. 2. At this region the sides of the spring 1 are also bent back as illustrated in Fig. 3.
  • a small block I4 of vibration-damping resilient material is positioned in the space between the tips of each pair of brush springs 6, 1 and is held in position by a lip I5 on the lower edge of the spring 6 and by the bent back sides oi the spring 1. Oscillograph tests have shown that the block of soft material III eiiectively damps vibration of the brushes, prevents vibration of the springs and reduces microphonic contact between the brushes and the terminal pins I3.
  • Figs. 4, 5 and 6 show the construction of the brush guide 9 which comprises a molded Bakelite block formed with two slots I6 to accommodate inturnedv ends of the supports 8. At the center at its lower edges as shown yin Fig. 6. The ends of the slot I9 are also ared as shown inyFig. 5 in order to guide the pins into the slot.
  • the guide assures alignment of the, brushes with the pins I3 and the accurate making and breaking ot the contact. It prevents one brush from pro- Jecting further between adjacent pins than the 3 other and thus allows of maximum rubbing coutI tact by each brush which in practice is about 85% of the distance between pin centers.
  • a contact brush for use in apparatus wherein contact and alignment are eected in succession between the contact brush and a plurality of linearly mounted contact pins, said contact brush comprising a first pair of substantially parallel 1 metallic spring members having inner contact surfaces at one end of each for making electrical contact with said contact pins, supporting means for said spring members, a second pair of substantially parallel springr members mounted on said supporting means one behind each of the iirst pair of spring members and vibraateatro ⁇ tion-damping blocks of homogeneous structure mounted one between and supported solely by each two adjacent spring members of said rst and second pairs oi spring members.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
  • Telephone Set Structure (AREA)
US547172A 1944-07-29 1944-07-29 Electrical contact brush Expired - Lifetime US2438510A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE465453D BE465453A (de) 1944-07-29
US547172A US2438510A (en) 1944-07-29 1944-07-29 Electrical contact brush
GB13546/45A GB595438A (en) 1944-07-29 1945-05-30 Electrical contact brushes
CH253360D CH253360A (de) 1944-07-29 1945-07-28 Elektrische Kontaktbürste.
FR926629D FR926629A (fr) 1944-07-29 1946-03-20 Contacts électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US547172A US2438510A (en) 1944-07-29 1944-07-29 Electrical contact brush

Publications (1)

Publication Number Publication Date
US2438510A true US2438510A (en) 1948-03-30

Family

ID=24183606

Family Applications (1)

Application Number Title Priority Date Filing Date
US547172A Expired - Lifetime US2438510A (en) 1944-07-29 1944-07-29 Electrical contact brush

Country Status (5)

Country Link
US (1) US2438510A (de)
BE (1) BE465453A (de)
CH (1) CH253360A (de)
FR (1) FR926629A (de)
GB (1) GB595438A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4371767A (en) * 1979-12-31 1983-02-01 Nihon Kaiheiki Kogyo Kabushiki Kaisha Small-sized switch

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US547337A (en) * 1895-10-01 Ship s ladder
GB148964A (en) * 1916-05-11 1921-09-15 Nautische Instr G M B H Ges Electrical contact device
US1835788A (en) * 1926-10-21 1931-12-08 Bell Telephone Labor Inc Electrical contact element
US2266156A (en) * 1940-08-01 1941-12-16 Fairbanks Morse & Co Ignition circuit breaker
US2268261A (en) * 1938-08-18 1941-12-30 Gen Railway Signal Co Relay
US2385994A (en) * 1943-11-26 1945-10-02 Clare & Co C P Relay

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US547337A (en) * 1895-10-01 Ship s ladder
GB148964A (en) * 1916-05-11 1921-09-15 Nautische Instr G M B H Ges Electrical contact device
US1835788A (en) * 1926-10-21 1931-12-08 Bell Telephone Labor Inc Electrical contact element
US2268261A (en) * 1938-08-18 1941-12-30 Gen Railway Signal Co Relay
US2266156A (en) * 1940-08-01 1941-12-16 Fairbanks Morse & Co Ignition circuit breaker
US2385994A (en) * 1943-11-26 1945-10-02 Clare & Co C P Relay

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4371767A (en) * 1979-12-31 1983-02-01 Nihon Kaiheiki Kogyo Kabushiki Kaisha Small-sized switch

Also Published As

Publication number Publication date
FR926629A (fr) 1947-10-07
CH253360A (de) 1948-02-29
BE465453A (de) 1946-05-24
GB595438A (en) 1947-12-04

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