US3745272A - Contact breaker assembly with improved adjustable distributor mounting plate and locking plate means - Google Patents

Contact breaker assembly with improved adjustable distributor mounting plate and locking plate means Download PDF

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Publication number
US3745272A
US3745272A US00200707A US3745272DA US3745272A US 3745272 A US3745272 A US 3745272A US 00200707 A US00200707 A US 00200707A US 3745272D A US3745272D A US 3745272DA US 3745272 A US3745272 A US 3745272A
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US
United States
Prior art keywords
plate
mounting plate
cam
angle
angle plate
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
US00200707A
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English (en)
Inventor
G Mosby
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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Filing date
Publication date
Application filed by Lucas Industries Ltd filed Critical Lucas Industries Ltd
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Publication of US3745272A publication Critical patent/US3745272A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
    • 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
    • H01R39/60—Devices for interrupted current collection, e.g. commutating device, distributor, interrupter

Definitions

  • a contact breaker assembly for use in the ignition system of an internal combustion engine includes a mounting plate arranged to mount the contact breaker assembly adjacent a rotatable cam.
  • An angle plate is supported on one face of the mounting plate and the angle plate carries a fixed electrical contact and also pivotally supports an insulating heel member carrying a movable contact.
  • the insulating heel member includes a cam follower engageable by the cam in use, and resilient means urges the heel member to pivot in a direction towards the cam so as to engage the movable contact with the fixed contact.
  • a locking plate is engaged with the face of the mounting plate remote from the angle plate and a pivot post extends between the locking plate and the angle plate through the mounting plate, the pivot post positioning the angle plate for pivotal movement relative'to the mounting plate about the axis of the heel member.
  • First and second rotatable eccentric adjustment devices act between the angle plate and the mounting plate and are operable respectively to move the angle plate relative to the mounting plate in a manner to adjust the position of the cam follower of the heel member around the periphery of the cam and towards and away from the cam. Locking screws are provided to lock the angle plate against movement relative to the mounting plate.
  • This invention relates to a contact breaker assembly for use in the ignition system of an internal combustion engine.
  • An assembly includes, a mounting plate arranged to mount the assembly adjacent a rotatable cam in use, an angle plate supported on one face of the mounting plate, the angle plate carrying a fixed electrical contact and having pivotally ri'iounted thereon an insulating heel member having a cam follower engageable by said cam in use, the heel member carrying a movable contact and the assembly having resilient means urging the heel member in a direction towards the cam to engage the movable contact with the fixed contact, a locking plate engaged with the other face of the mounting plate, a pivot post extending between the locking plate and the angle plate and mounting the-angle plate for pivotal movement about the pivotal axis of the heel member, a first adjustment device acting between the angle plate and the mounting plate and operable to move the angle plate and the locking plate relative to the mounting plate in a manner to adjust the position of the cam follower of the heel member around the periphery of the cam, and locking means operable to lock the angle plate against movement relative to the mounting plate.
  • the assembly includes a second adjustment device acting between the angle plate and the mounting plate and operable to move said angle plate about the axis of said pivot post relative to said locking plate and said mounting plate in a manner to move said cam follower towards or away from said cam.
  • said means is defined by a bolt or screw extending through a slot in the mounting plate and engaged with the locking plate.
  • said bolt or screw also constitutes said pivot post.
  • first and second adjustment devices are defined by first and second members rotatably mounted on the angle plate and having eccentric portions engaged in respective apertures in the mounting plate.
  • first and second rotatable member have associated therewith respective locking means capable of locking the member respectively against rotation relative to the angle plate.
  • said mounting plate isannular and is arranged to encircle said cam in use, the mounting plate also carrying a second angle plate having pivotally mounted thereon second insulating heel member having a cam follower engageable by the cam and the second heel member carrying a second movable contact engageable with a second fixed contact carried by the second angle plate, the second angle plate being mounted on the mounting plate for pivotal movement relative thereto about the pivotal axis of the second heel member, and there being provided a third adjustment device operable to pivot the second angle plate relative to the mounting plate, and further locking means operable to fix the second angle plate relative to the mounting plate.
  • the second cam follower is displaced from the first mentioned cam follower by approximately around the mounting plate.
  • FIG. 1 is a plan view of a contact breaker assembly
  • FIG. 2 is a sectional view on the line 22 in FIG. 1,
  • FIG. 3 is a sectional view on the line 33 in FIG. 1, and
  • FIG. 4 is a plan view of the mounting plate of the assembly.
  • the assembly includes a mounting plate 11 which is arranged to be secured in the casing of a magneto of the ignition system of an internal combustion engine. It will be appreciated however that the assembly to be described is equally applicable to ignition systems utilizing ignition distributors, wherein the plate 11 will be arranged to be mounted within the casing of the ignition distributor. In either case the operating cam of the magneto, or ignition distributor will extend through a central, circular aperture 12 in the plate. Supported on one face of the plate 11 is a metal angle plate 13 upstanding from which is a hollow cylindrical sleeve 14 which supports an insulating heel member 15.
  • the heel member 15 is pivotally mounted on the sleeve 14, and includes a cam follower 16 which is engageable with the cam surface of the rotatable cam of the magneto.
  • a cam follower 16 Secured to the heel 15 is a movable electrical contact 17 the contact 17 being electrically connected to a conductive leaf spring 18 which at its end remote from the contact 17 is anchored to an insulating support 19 upstanding from the plate 13.
  • the support 19 is arranged to receive terminals whereby electrical connections can be made to the movable contact 17.
  • the heel member 15 is moulded in insulating material, and so insulates the moving contact 17 from the plate 13.
  • the leaf spring 18 urges the heel member 15 to pivot about the sleeve 14in a direction to move the cam follower 16 towards the cam of the magneto, and to engage the moving contact 17 with a fixed contact 21 supported on, and electrically connected to a peg integral with the angle plate 13.
  • a locking plate 22 in the form of an elongated metal strip.
  • a screw 23 In screw-threaded engagement with the plate 22, and extending through an arcuate slot 230 in the mounting plate 11 is a screw 23 having a cylindrical head 24 which engages the mounting plate 11 and which extends upwardly through a hole in the plate 13 and into the sleeve 14.
  • the screw 23 serves the double function of acting as locking means capable of locking the plate 22 in position relative to the plate 11 and also acting as a pivot post about which the plate 13 can pivot relative to the plates 11, 22.
  • the slot 23a in the plate 11 through which the screw 23 extends is arcuate, the slot being an are having its center of curvature coincident with the center of the circular aperture 12 in the plate 11.
  • Extending through the plates 11 and 13 are a pair of locking screws 26 and 27 respectively.
  • the heads of the screws 26, 27 engage the surface of the plate 13, and the shanks of the screws 27 are in screw-threadedengagement with the plate 22.
  • the screws 26, 27 pass through respective elongated slots in the plate 13, the elongated slots in the plate 13 extending generally radially with respect to the plate 11, and the screws 26, 27 also extend through respective arcuate elongated arcuate slots 26a, 27a in the plate 11, the slots 26a, 27a having their centers of curvature coincident with the center of the aperture 12.
  • the device 29 includes a screw threaded shank 31 which extends through a clearance hole 32 in the plate 13.
  • the plate 13 is formed with a recess in its lower surface within which a disc like portion 33 integral with the shank 31 is located.
  • Extending downw ardly from the portion 33 is a cylindrical projection 34, the projection 34 being off-set from the axis of the shank 31 so as to constitute an eccentric.
  • the portion 34 is engaged in an elongated arcuate slot 34a in the plate 11, the slot 34a in the plate 11 being disposed with its center of curvature coincident with the center of the aperture 12.
  • a lock nut 35 Engaged with the portion of the shank 31 of the device 29, where the shank 31 projects from the upper surface of the plate 13 is a lock nut 35 which, when tightened against the plate 13 prevents rotational movement of the device 29 relative to the plate 13.
  • the arrangement of the device 28 is substantially identical, with the exception that the arcuate slot 30 in the plate 11 into which the eccentric portion of the device 28 extends, is disposed generally radially of the plate 11.
  • the lock nut of the device 29 is tightened, to prevent further rotation of the device 29 relative to the plate 1.3.
  • the screw 23 can then be released, whereupon the plates 13 and 22 will be free to move arcuately relative to the plate 11 about a center of curvature coincident with the center of the aperture 12 in the plate 11.
  • the setting of the operating gap of the contacts 17, 21 will not of course be lost since the device 29 was locked in the desired position.
  • Rotation of the device 28 causes such arcuate movement of the plates 13 and 22, and thereby adjusts the position of the cam follower 16 around the periphery of the cam of the magneto.
  • the plate 11 further serves to support a second angle plate 41 which is mounted on the plate 11 for pivotal movement about a pivot post 42 extending upwardly from the plate 11.
  • the pivot post 42 is fixed with respect to the plate 11, and so the plate 41 cannot be moved arcuately on the plate 11, but can only pivot about the post 42.
  • a further pair of locking screws 43, 44 are provided for locking the plate 41 in position relative to the plate 11, and extending from the plate 41, co-extensive with the post 42, and surrounding the post 42 is a hollow .sleeve 45 upon which is pivotally mounted an insulating heel member 46.
  • the heel member 46 includes a cam follower 47 which is engageable with the cam of the magneto, and further carries a movable contact 48.
  • the movable contact is electrically connected to a conductive leaf spring 49 the end of which remote from the contact 48 is anchored to the plate 41 in a manner identical to that described with reference to the spring 18.
  • a fixed contact 51 is supported on a tag integral with, and upstanding from the plate 41, and the contact 48 is movable into and out of engagement with the contact 51 in response to rotation of the cam of the magneto.
  • An eccentric mechanism 52 similar in operation to the devices 28, 29, although without the provision of a lock nut is provided for moving the plate 41 about the pivot post 42 to adjust the maximum operating gap of the contacts 48, 51. 2
  • the contact gap of the contacts 38, 51 is first set by means of the eccentric device 52, and the plate 41 is then locked in position relative to the plate 11.
  • the plate 11 is then moved relative to the cam of the magneto, to adjust the timing of the operation of the contacts 51, 48.
  • the operating gap of the contacts 17, 21 is then set by means of the device 29, whereafter the lock nut of the device 29 is tightened to prevent alteration in the gap setting, and the position of the cam follower 16 relative to the cam follower 47 around the periphery of the cam is adjusted by means of the adjusting device 28.
  • a contact breaker assembly for use in the ignition system of an internal combustion engine, including, a mounting plate arranged to be fixed adjacent a rotatable cam in use, an angle plate supported on one face of the mounting plate, the angle plate carrying a fixed electrical contact and having pivotally mounted thereon an insulating heel member having a cam follower engageable by said cam in use, the heel member carrying a movable contact and the assembly having resilient means urging the heel member in a direction towards the cam to engage the movable contact with the fixed contact, a locking plate engaged with the other face of the mounting plate, a pivot post extending between the locking plate and the angle plate and mounting the angle plate for pivotal movement relative to the mounting plate about the pivotal axis of the heel member, a first adjustment device acting between the angle plate and the mounting plate and operable to move the angle plate, the locking plate and the pivot post relative to the mounting plate in an arcuate path to adjust the position of the cam follower of the heel member around the periphery of the cam, first locking means operable to lock the locking
  • first adjustment device is defined by a first member rotatably mounted on the angle plate and having an eccentric portion engaged in an aperture in the mounting plate.
  • mounting plate is annular and is arranged to encircle said cam in use, the mounting plate also carrying a second angle plate having pivotally mounted thereon second insulating heel member having a cam follower engageable by the cam and the second heel member carrying a second movable contact engageable with a second fixed contact carried by the second angle plate, the second angle plate being mounted on the mounting plate for pivotal movement relative thereto about the pivotal axis of the second heel member, and there being provided a third adjustment device operable to pivot the second angle plate relative to the mounting plate, and further locking means operable to fix the second angle plate relative to the mounting plate.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)
US00200707A 1970-11-24 1971-11-22 Contact breaker assembly with improved adjustable distributor mounting plate and locking plate means Expired - Lifetime US3745272A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5572270A GB1364246A (en) 1970-11-24 1970-11-24 Contact breaker assembly

Publications (1)

Publication Number Publication Date
US3745272A true US3745272A (en) 1973-07-10

Family

ID=10474697

Family Applications (1)

Application Number Title Priority Date Filing Date
US00200707A Expired - Lifetime US3745272A (en) 1970-11-24 1971-11-22 Contact breaker assembly with improved adjustable distributor mounting plate and locking plate means

Country Status (7)

Country Link
US (1) US3745272A (enExample)
AU (1) AU461194B2 (enExample)
DE (1) DE2157943A1 (enExample)
ES (1) ES174844Y (enExample)
FR (1) FR2115955A5 (enExample)
GB (1) GB1364246A (enExample)
IT (1) IT945067B (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD945606S1 (en) * 2020-02-21 2022-03-08 American Sterilizer Company Mounting plate

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730583A (en) * 1952-10-16 1956-01-10 Renberles Products Co Distributor plate assembly
US2835755A (en) * 1956-10-25 1958-05-20 Filko John Adjustable contact assembly
US2847524A (en) * 1954-06-07 1958-08-12 Case Co J I Magneto breaker mechanism
US2854534A (en) * 1956-11-23 1958-09-30 John P Beauclair Distributor for ignition system
US2914625A (en) * 1957-02-04 1959-11-24 Shurhit Products Inc Ignition breaker assembly
US3510609A (en) * 1967-03-20 1970-05-05 Lucas Industries Ltd Ignition distributors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730583A (en) * 1952-10-16 1956-01-10 Renberles Products Co Distributor plate assembly
US2847524A (en) * 1954-06-07 1958-08-12 Case Co J I Magneto breaker mechanism
US2835755A (en) * 1956-10-25 1958-05-20 Filko John Adjustable contact assembly
US2854534A (en) * 1956-11-23 1958-09-30 John P Beauclair Distributor for ignition system
US2914625A (en) * 1957-02-04 1959-11-24 Shurhit Products Inc Ignition breaker assembly
US3510609A (en) * 1967-03-20 1970-05-05 Lucas Industries Ltd Ignition distributors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD945606S1 (en) * 2020-02-21 2022-03-08 American Sterilizer Company Mounting plate
USD1041002S1 (en) 2020-02-21 2024-09-03 American Sterilizer Company Mounting plate

Also Published As

Publication number Publication date
AU3602971A (en) 1973-05-31
GB1364246A (en) 1974-08-21
FR2115955A5 (enExample) 1972-07-07
ES174844Y (es) 1972-12-01
AU461194B2 (en) 1975-05-02
IT945067B (it) 1973-05-10
DE2157943A1 (de) 1972-05-31
ES174844U (es) 1972-06-01

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