US3267243A - Breaker arm assembly for a contact set - Google Patents

Breaker arm assembly for a contact set Download PDF

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Publication number
US3267243A
US3267243A US428360A US42836065A US3267243A US 3267243 A US3267243 A US 3267243A US 428360 A US428360 A US 428360A US 42836065 A US42836065 A US 42836065A US 3267243 A US3267243 A US 3267243A
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United States
Prior art keywords
contact
breaker
arm
spring
metal
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Expired - Lifetime
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US428360A
Inventor
Gianni A Dotto
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Duracell Inc USA
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PR Mallory and Co Inc
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Publication date
Application filed by PR Mallory and Co Inc filed Critical PR Mallory and Co Inc
Priority to US428360A priority Critical patent/US3267243A/en
Priority to GB2080/66A priority patent/GB1082597A/en
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Publication of US3267243A publication Critical patent/US3267243A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/226—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars

Definitions

  • pivotless contactor In an attempt to overcome the alignment difficulty, a type of contactor known as the pivotless contactor has been devised wherein a contact arm is held and located by a flat leaf spring. Because there is no lost mo-v tion or friction in the spring itself, there is commonly no difliculty experienced with relativealignment of contacts. However, as the spring must be free to bend over some appreciable length, and as the force exerted by the cam on the arm during the open period is ordinarily applied at a different distance from the spring than the force applied to the contact when closed, there are otten undesirable variations in the effective center of rotation ofv the contact arm during the process of making or breaking contact.
  • the invention in another of its aspects, relates to novel features of the instrument-alities described herein for teaching the principal object of the invention and to the novel principles employed in the instrumenta-lities whether or not these features and principles may be used in the said object and/ or in the said field.
  • FIGURE 1 is a top view of one embodiment of the completed lever.
  • FIGURE 2 is an isometric view of the breaker arm assembly employed in FIGURE 1.
  • FIGURE 3 is a crosseectional view of section 33 taken from FIGURE 1.
  • FIGURE 4 is a cross-sectional view of section 44 taken from FIGUERE
  • FIGURE 5 is a top view of a second embodiment of the completed lever.
  • FIGURE 6 is an isometric view of the breaker arm assembly employed in FIGURE 5.
  • FIGURE 7 is a cross-sectional view of section 7-7 taken from FIGURE 5.
  • FIGURE 8 is a top view of web portion of FIGURE 5.
  • the present invention provides a durable circuit breaker lever which operates at high speed without chattering or rebounding of contacts.
  • a rubber or nylon gasket is force fitted around the pivot shaft which prevents play in the breaker arm and thus eliminates variation in the contact location.
  • the breaker arm pivots by virtue of the displacement of the material utilized to grip the shaft. The force fitted material is not affected by the various temperatures and thus contact is assured at all times.
  • a circuit breaker 10 comprises breaker arm support plate 11 to which breaker arm 12 is to and allowed to rotate by cantilevered shaft 13.
  • a rubber cup or gasket 14 is force fitted around shaft 13 and held in place by metal cup 15.
  • Spring arm 16 is secured to plate 11 by securing means 17 and is secured to breaker arm 12 by U-shaped channel 18 which is crimped around spring arm 16. An end portion of spring arm 16 is secured in nylon.
  • a movable contact 20 is affixed to breaker arm 12 and a stationary contact 21 is mounted on ear 22 of support plate 11. Open ings 23 and 24 are formed in plate 11 for mounting purposes.
  • spring arm 16 is held I to breaker arm 12 in U-shaped channel 18 which is crimped at four points to secure the spring.
  • the channel and crimp eliminate riveting the spring to the breaker arm as is normally done in devices of this type.
  • the end of the spring 16 has an aperture so that when nylon portion 19 is molded to spring 16, added holding strength is obtained.
  • Portion 19 also interfits with the U-shaped channel and is held by the crimping and pressure from the spring.
  • the interrelation of rubber gasket 14 which prevents dislocation of shaft 13 (not shown) and metal cup 15 can also be seen in FIGURE 2.
  • FIGURE 3 shows the shaft assembly in detaiL.
  • Shaft 13 is secured to plate 11 by staking means 23.
  • Rubber cup 14 may be formed in two portions as is shown in the drawing or in one portion, and is secured by metal cup 15 which is in two portions and is spot welded at point 26. The metal cup is crimped around the ends of the rubber cup to secure it to the shaft. Washer 25 is part of the securing means 23.
  • Circuit breaker 30 comprises a breaker arm support plate 31.
  • Breaker arm 32 is secured to plate 31 by cantilever shaft 33.
  • the major portion of breaker arm 32 is a molded nylon portion 34.
  • Portion 34 has webbed portion 35 which is force fitted over shaft 33 to prevent bouncing and thus prevent contact misalignment.
  • Spring arm 36 interfits and is riveted to recessed portion 37 of nylon portion 34, portion 34 being secured to metal portion 44 by the same riveting process at four points, 38, 39, 40 and 41.
  • Contact portion 42 for actuator cam (not shown) is part of molded portion 34.
  • the metal portion 44 interfits in channel 43 of nylon portion 34 prior to riveting.
  • Metal portion 44 has a movable contact 45 secured thereto.
  • a stationary contact 46 is attached to ear 47 of plate 31.
  • the top portion of springarm 36 is afiixed by securing means 49.
  • FIGURE 7 webbed portion 35 of molded nylon arm 34 is shown after being force fitted over splined shaft 33. The relation of spring 36 to the shaft assembly is also shown. Washer 48 separates webbed portion 35 from plate 31. Shaft 33 is secured to plate 31 by securing means 50.
  • An ignition contact set comprising: a bracket having a splined shaft extending upwardly therefrom and rigidly fastened thereto; a resilient plastic hub having an inner hub portion press fitted onto said splined shaft so as to be secured thereto, an outer hub port-ion, and a plurality of radially spaced integrally formed webs flexibly connecting said outer hub portion to said inner hub portion; said outer hub portion having an integrally formed portion extending therefrom, said integrally formed portion having a channel receiving a metal arm, a channel receiving a leaf spring, and a rubbing block; a moveable contact mounted on said metal arm so as, to be adjacent to a fixed contact mounted on said bracket; means securing said metal arm to said integrally formed portion and a first end of said leaf spring so as to electrically connect said moveable contact to said leaf spring;
  • An ignition contact set comprising: a bracket haw 4 ing a shaft extending upwardly therefrom and rigidly fastened thereto; a resilient plastic hub having an inner hub portion affixed to said shaft so as to be secured thereto, an outer hub portion, and four equally and radially spaced integrally formed webs flexibly connecting said outer hub portion to said inner hub portion; said hu-b having an integrally formed portion extending therefrom, said integrally formed portion having a channel receiving a metal arm,
  • a channel receiving a leaf spring, and a rubbing block a moveable contact mounted on said metal arm so as to be adjacent to a fixed contact mounted on said bracket; means securing said metal arm to said integrally formed portion and a first end of said leaf .spring so as to electrically connect said moveable contact to said leaf spring; and means securing said second end of said leaf spring to said bracket so as to spring load said moveable contact against said fixed contact.
  • a two part breaker arm comprising: a molded plastic portion and a metal portion; said molded plastic portion including a webbed hub having an inner hub portion press fitted onto a splined shaft of said contact set, an outer hub portion circumscribing said inner hub portion, a plurality of radially spaced integrally formed webs flexibly connecting said outer hub portion to said inner hub portion, a channel receiving a leaf spring, a channel receiving said metal portion, and a rubbing block; said metal portion riveted to said plastic portion and to said leaf spring; and a contact mounted on said metal portion.
  • a two part breaker arm comprising: a molded plastic portion and a metal portion; said molded plastic portion including a webbed hub having an inner hub portion press fitted onto a splined shaft of said contact set, an outer hub portion circumscribing said inner hub portion, four equally and radially spaced integrally formed webs connecting said outer hub por-- tion to said inner hub portion so as to permit said outer hub portion to rot-ate with respect to said inner hub portion, a channel receiving a leaf spring, a channel receiving said metal portion, and a rubbing block; said metal portion riveted to said plastic portion and to said leaf spring; and a contact mounted on said metal portion.
  • a two part breaker arm adapted to pivot about a splined shaft comprising: a molded nylon portion and a metal portion, said nylon portion including a webbed hub portion; a channel receiving a leaf spring, a channel receiving said metal portion, and a rubbing block; said metal portion riveted to said breaker arm, said rivets making contact between said spring and said metal portion; said metal portion having a movable contact thereon; said webbed hub force fitted over said splined shaft thereby eliminating play in said breaker arm.

Description

1965 G. A. DOTTO 3,267,243
BREAKER ARM ASSEMBLY FOR A common sE'r Filed Jan. 27, 1965 2 Sheets-Sheet 1 INVENTOR GIA/V/V/ A. DOTTO ATTO R NEY Aug. 16, 1966 s. A. DOTTO 3,267,243
BREAKER ARM ASSEMBLY FOR A CONTACT SET Filed Jan. 27, 1965 2 Sheets-Sheet 2 INVENTOR GlA/V/ A. norm ATTORNEY P 3,267,243 Patented Aug 1966' 3,267 243 BREAKER ARM ASSEMBEY FOR A CONTACT SET Gianni A. Dotto, Dayton, Ohio, assignor to P. R. Mallory & Co., Inc., Indianapolis, Ind., acorporation of Dela.
ware
FiledJan.27,1965,Ser.No.428,360
s laims. c1. 200-166) in effectively rotationally centering the contact arm during the process of opening and breaking contacts is avoided.
In the several types of circuit breaker systems heretofore constructed, certain disadvantages have been found. For example, in pivoted breaker type systems, there is the disadvantage that any clearance in the pivot bearing used in the breaker, whether radial or axial clearance, allows an undesirable variation in the relative alignment of the two contacts during operation. To keep these clearances within reasonable limits at all temperatures over a reasonable lifetime is an exacting problem of design and production, for as, the life of the contacts progresses, surface irregularities develop on the contacts. Normally, one contact becomes pitted and the other contact develops a projection of deposited metal. If these do not always mate exactly, both the performance and the life of the contacts are adversely affected.
In an attempt to overcome the alignment difficulty, a type of contactor known as the pivotless contactor has been devised wherein a contact arm is held and located by a flat leaf spring. Because there is no lost mo-v tion or friction in the spring itself, there is commonly no difliculty experienced with relativealignment of contacts. However, as the spring must be free to bend over some appreciable length, and as the force exerted by the cam on the arm during the open period is ordinarily applied at a different distance from the spring than the force applied to the contact when closed, there are otten undesirable variations in the effective center of rotation ofv the contact arm during the process of making or breaking contact. This effect is likely to be most pronounced at high speeds where inertia forces are relatively large in comparison with static forces. To combat this result, the effective length of the spring is made very short. The shortening of the spring, however, results in highly concentrated stresses in the spring and necessitates very exacting tolerances of forming to maintain proper contact pressure.
It is therefore an object of the present invention to provide a novel ignition contact breaker having a construction which provides exact contact alignment for the breaker and wherein said breaker may be definitely angularly positioned so as to provide for an improved high speed ignition contact make and break system.
It is an object of the present invention to provide a durable ignition contact breaker which operates at 'high speeds without chattering or rebounding.
It is an object of the present invention to provide a means for eliminating play at the pivot in order to reduce the spurious oscillations and contact bounce and thus improve breaker performance.
The invention, in another of its aspects, relates to novel features of the instrument-alities described herein for teaching the principal object of the invention and to the novel principles employed in the instrumenta-lities whether or not these features and principles may be used in the said object and/ or in the said field.
Otherobjects of the invention and the nature thereof will become apparent from the following description considered in conjunction with the accompanying figures of the drawing and wherein like reference characters describe elements of similar function therein and wherein the scope of the invention is determined rather from the dependent claims.
Referring now to the drawings:
FIGURE 1 is a top view of one embodiment of the completed lever.
FIGURE 2 is an isometric view of the breaker arm assembly employed in FIGURE 1.
FIGURE 3 is a crosseectional view of section 33 taken from FIGURE 1.
FIGURE 4 is a cross-sectional view of section 44 taken from FIGUERE FIGURE 5 is a top view of a second embodiment of the completed lever.
FIGURE 6 is an isometric view of the breaker arm assembly employed in FIGURE 5.
FIGURE 7 is a cross-sectional view of section 7-7 taken from FIGURE 5.
FIGURE 8 is a top view of web portion of FIGURE 5.
Generally speaking the present invention provides a durable circuit breaker lever which operates at high speed without chattering or rebounding of contacts. To accomplish this, a rubber or nylon gasket is force fitted around the pivot shaft which prevents play in the breaker arm and thus eliminates variation in the contact location. The breaker arm pivots by virtue of the displacement of the material utilized to grip the shaft. The force fitted material is not affected by the various temperatures and thus contact is assured at all times.
A circuit breaker 10 comprises breaker arm support plate 11 to which breaker arm 12 is to and allowed to rotate by cantilevered shaft 13. A rubber cup or gasket 14 is force fitted around shaft 13 and held in place by metal cup 15. Spring arm 16 is secured to plate 11 by securing means 17 and is secured to breaker arm 12 by U-shaped channel 18 which is crimped around spring arm 16. An end portion of spring arm 16 is secured in nylon.
rubbing portion 19 for actuating cam. A movable contact 20 is affixed to breaker arm 12 and a stationary contact 21 is mounted on ear 22 of support plate 11. Open ings 23 and 24 are formed in plate 11 for mounting purposes.
In FIGURE 2, it can be seen that spring arm 16 is held I to breaker arm 12 in U-shaped channel 18 which is crimped at four points to secure the spring. The channel and crimp eliminate riveting the spring to the breaker arm as is normally done in devices of this type. The end of the spring 16 has an aperture so that when nylon portion 19 is molded to spring 16, added holding strength is obtained. The relationship between spring 16 and portion 19 can be seen in FIGURE 4. Portion 19 also interfits with the U-shaped channel and is held by the crimping and pressure from the spring. The interrelation of rubber gasket 14 which prevents dislocation of shaft 13 (not shown) and metal cup 15 can also be seen in FIGURE 2.
I FIGURE 3 shows the shaft assembly in detaiL. Shaft 13 is secured to plate 11 by staking means 23. Rubber cup 14 may be formed in two portions as is shown in the drawing or in one portion, and is secured by metal cup 15 which is in two portions and is spot welded at point 26. The metal cup is crimped around the ends of the rubber cup to secure it to the shaft. Washer 25 is part of the securing means 23.
A second embodiment of the present invention is shown in FIGURE 5. Circuit breaker 30 comprises a breaker arm support plate 31. Breaker arm 32 is secured to plate 31 by cantilever shaft 33. As can be seen in FIGURE 6, the major portion of breaker arm 32 is a molded nylon portion 34. Portion 34 has webbed portion 35 which is force fitted over shaft 33 to prevent bouncing and thus prevent contact misalignment. Spring arm 36 interfits and is riveted to recessed portion 37 of nylon portion 34, portion 34 being secured to metal portion 44 by the same riveting process at four points, 38, 39, 40 and 41. Contact portion 42 for actuator cam (not shown) is part of molded portion 34. The metal portion 44 interfits in channel 43 of nylon portion 34 prior to riveting. Metal portion 44 has a movable contact 45 secured thereto. A stationary contact 46 is attached to ear 47 of plate 31. The top portion of springarm 36 is afiixed by securing means 49. Y 1
In FIGURE 7, webbed portion 35 of molded nylon arm 34 is shown after being force fitted over splined shaft 33. The relation of spring 36 to the shaft assembly is also shown. Washer 48 separates webbed portion 35 from plate 31. Shaft 33 is secured to plate 31 by securing means 50.
0.0016 or A degree.
In both embodiments of the present invention, play in the breaker arm wln'ch results in variation in the contact location, and thus chattering and rebounding of contacts is eliminated by force fitting a rubber or nylon gasket around the pivot shaft. The breaker arm then pivots by virtue of displacement of the material utilized to grip the shaft. The force fitted materials are not affected by various temperatures and thus accurate contact is assured at all times.
The embodiments of novel invention as hereinabove described are merely illustrative and not exhaustive in scope and since many widely different embodiments of the invention may be made without departing from the scope thereof, it is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
What is claimed is:
1. An ignition contact set comprising: a bracket having a splined shaft extending upwardly therefrom and rigidly fastened thereto; a resilient plastic hub having an inner hub portion press fitted onto said splined shaft so as to be secured thereto, an outer hub port-ion, and a plurality of radially spaced integrally formed webs flexibly connecting said outer hub portion to said inner hub portion; said outer hub portion having an integrally formed portion extending therefrom, said integrally formed portion having a channel receiving a metal arm, a channel receiving a leaf spring, and a rubbing block; a moveable contact mounted on said metal arm so as, to be adjacent to a fixed contact mounted on said bracket; means securing said metal arm to said integrally formed portion and a first end of said leaf spring so as to electrically connect said moveable contact to said leaf spring;
and means securing said second end of said leaf spring to said bracket so as to spring load said moveable contact against said fixed contact.
2. An ignition contact set comprising: a bracket haw 4 ing a shaft extending upwardly therefrom and rigidly fastened thereto; a resilient plastic hub having an inner hub portion affixed to said shaft so as to be secured thereto, an outer hub portion, and four equally and radially spaced integrally formed webs flexibly connecting said outer hub portion to said inner hub portion; said hu-b having an integrally formed portion extending therefrom, said integrally formed portion having a channel receiving a metal arm,
a channel receiving a leaf spring, and a rubbing block; a moveable contact mounted on said metal arm so as to be adjacent to a fixed contact mounted on said bracket; means securing said metal arm to said integrally formed portion and a first end of said leaf .spring so as to electrically connect said moveable contact to said leaf spring; and means securing said second end of said leaf spring to said bracket so as to spring load said moveable contact against said fixed contact.
3. In an ignition contact set, a two part breaker arm comprising: a molded plastic portion and a metal portion; said molded plastic portion including a webbed hub having an inner hub portion press fitted onto a splined shaft of said contact set, an outer hub portion circumscribing said inner hub portion, a plurality of radially spaced integrally formed webs flexibly connecting said outer hub portion to said inner hub portion, a channel receiving a leaf spring, a channel receiving said metal portion, and a rubbing block; said metal portion riveted to said plastic portion and to said leaf spring; and a contact mounted on said metal portion.
4. in an ignition contact set, a two part breaker arm comprising: a molded plastic portion and a metal portion; said molded plastic portion including a webbed hub having an inner hub portion press fitted onto a splined shaft of said contact set, an outer hub portion circumscribing said inner hub portion, four equally and radially spaced integrally formed webs connecting said outer hub por-- tion to said inner hub portion so as to permit said outer hub portion to rot-ate with respect to said inner hub portion, a channel receiving a leaf spring, a channel receiving said metal portion, and a rubbing block; said metal portion riveted to said plastic portion and to said leaf spring; and a contact mounted on said metal portion.
5. In an ignition breaker a two part breaker arm adapted to pivot about a splined shaft comprising: a molded nylon portion and a metal portion, said nylon portion including a webbed hub portion; a channel receiving a leaf spring, a channel receiving said metal portion, and a rubbing block; said metal portion riveted to said breaker arm, said rivets making contact between said spring and said metal portion; said metal portion having a movable contact thereon; said webbed hub force fitted over said splined shaft thereby eliminating play in said breaker arm.
References Cited by the Examiner UNITED STATES PATENTS 2,579,523 12/1951 Terry 200-166 2,865,755 5/ 1958 [Filko 20030 3,003,043 10/ 1961 'Meyer 20030 3,033,947 5/1962 Johnson 200l66 X ROBERT K. SCI-IAEFER, Primary Examiner. ROBERT S. MACON, Examiner. H. O. JONES, Assistant Examiner.

Claims (1)

  1. 5. IN AN IGNITION BREAKER A TWO PART BREAKER ARM ADAPTED TO PIVOT ABOUT A SPLINED SHAFT COMPRISING: A MOLDED NYLON PORTION AND A METAL PORTION, SAID NYLON PORTION INCLUDING A WEBBED HUB PORTION; A CHANNEL RECEIVING A LEAF SPRING, A CHANNEL RECEIVING SAID METAL PORTION AND A RUBBING BLOCK; SAID METAL PORTION RIVETED TO SAID BREAKER ARM, SAID RIVETS MAKING CONTACT BETWEEN SAID SPRING AND SAID METAL PORTION; SAID METAL PORTION HAVING
US428360A 1965-01-27 1965-01-27 Breaker arm assembly for a contact set Expired - Lifetime US3267243A (en)

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US428360A US3267243A (en) 1965-01-27 1965-01-27 Breaker arm assembly for a contact set
GB2080/66A GB1082597A (en) 1965-01-27 1966-01-17 Ignition circuit breaker

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3553408A (en) * 1968-07-25 1971-01-05 Lucas Industries Ltd Contact breaker assemblies
US3558838A (en) * 1968-03-29 1971-01-26 Lucas Industries Ltd Contact breaker assemblies
US4267419A (en) * 1979-07-30 1981-05-12 Westinghouse Electric Corp. Circuit breaker structure with shock absorbers
US7217895B1 (en) * 2006-07-06 2007-05-15 Eaton Corporation Electrical switching apparatus contact assembly and movable contact arm therefor
EP1744341A3 (en) * 2005-07-11 2008-01-23 EATON Corporation Contact assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2579523A (en) * 1947-01-24 1951-12-25 Int Standard Electric Corp Telegraph relay
US2835755A (en) * 1956-10-25 1958-05-20 Filko John Adjustable contact assembly
US3003043A (en) * 1958-06-13 1961-10-03 Electric Auto Lite Co Contacts assembly
US3033947A (en) * 1958-12-30 1962-05-08 Holley Carburetor Co Ignition contact set

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2579523A (en) * 1947-01-24 1951-12-25 Int Standard Electric Corp Telegraph relay
US2835755A (en) * 1956-10-25 1958-05-20 Filko John Adjustable contact assembly
US3003043A (en) * 1958-06-13 1961-10-03 Electric Auto Lite Co Contacts assembly
US3033947A (en) * 1958-12-30 1962-05-08 Holley Carburetor Co Ignition contact set

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3558838A (en) * 1968-03-29 1971-01-26 Lucas Industries Ltd Contact breaker assemblies
US3553408A (en) * 1968-07-25 1971-01-05 Lucas Industries Ltd Contact breaker assemblies
US4267419A (en) * 1979-07-30 1981-05-12 Westinghouse Electric Corp. Circuit breaker structure with shock absorbers
EP1744341A3 (en) * 2005-07-11 2008-01-23 EATON Corporation Contact assembly
US7217895B1 (en) * 2006-07-06 2007-05-15 Eaton Corporation Electrical switching apparatus contact assembly and movable contact arm therefor

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Publication number Publication date
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