Ignition distributor centrifugal advance mechanism

Claim 2

An ignition control device for an internal combustion engine comprising, a base member, a shaft rotatably supported by said base member, a weight plate secured directly to said shaft having spaced openings, a pair of pivot pins carried by said weight plate, a flyweight pivotally supported by each pivot pin, an ignition timing control device located on one side of said weight plate having a timing control part disposed about said shaft, said timing control device and timing control part being rotatably adjustable relative to said shaft, a cam plate located on an opposite side of said weight plate having outer wall sections respectively engaging said flyweights, a pair of posts rigidly connecting said cam plate and said timing control device, each of said posts extending through respective opening in said weight plate and connected respectively to said timing control device and cam plate at points disposed on opposite sides of said weight plate, said posts serving to maintain a predetermined axial spacing between cam plate and timing control device, and a spring connected between each pivot pin on said weight plate and each post.

Claim 3

An ignition control device for an internal combustion engine comprising, a base member, a shaft adapted to be driven by said engine rotatably supported by said base member, a weight plate secured directly to said shaft, a pair of pivot posts carried by said weight plate, a flyweight pivotally supported by each pivot post, an ignition timing control device located on one side of said weight plate including a timing control part disposed about said shaft, said control device and timing control part being rotatably adjustable relative to said shaft, a cam plate located on an opposite side of said weight plate and in alignment with said flyweights, said cam plate having contoured outer wall sections respectively engaging said flyweights, a pair of openings in said weight plate, a pair of posts connected to said cam plate at a point adjacent the end of the posts, each post extending axially through a said opening in said weight plate with an opposite end of each post connected to said timing control device whereby said cam plate and timing control device move together, and a spring connecting each weight plate pivot post with a respective post connected to said cam plate.

Claim 4

An ignition control device for an internal combustion engine comprising, a base member, a shaft adapted to be driven by said engine rotatably supported by said base member, a weight plate secured directly to said shaft, a pair of pivot posts carried by said weight plate, a flyweight pivotally supported by each pivot post, an ignition timing control device located on one side of said weight plate including a timing control part disposed about said shaft, said control device and timing control part being rotatably adjustable relative to said shaft, a cam plate located on an opposite side of said weight plate and in alignment with said flyweights, said cam plate having contoured outer wall sections respectively engaging said flyweights, a pair of openings in said weight plate, a pair of posts connected to said cam plate at a point adjacent the end of the posts, each post extending axially through a said opening in said weight plate with an opposite end of each post connected to said timing control device whereby said cam plate and timing control device move together, and a spring connecting each weight plate pivot post with a respective post connected to said cam plate.

Claim 5

An ignition controL device for developing an ignition timing control voltage for an ignition system comprising, a base member, a shaft rotatably supported by said base member, a weight plate connected directly to said shaft having a pair of openings, a pair of pivot pins carried by said weight plate, a flyweight pivotally supported by each pivot pin, an ignition timing control device located on one side of said weight plate including a laterally extending base plate and a pole piece having a plurality of teeth, said timing control device being rotatably supported by said shaft and rotatably adjustable relative to said shaft, a cam plate located on an opposite side of said weight plate having outer wall sections respectively engaging said flyweights, a pair of posts rigidly connecting said cam plate and said base plate whereby said cam plate and timing control device rotate together, each of said posts extending through a respective opening in said weight plate and connected to said base plate and cam plate at points disposed on opposite sides of said weight plate, said posts serving to maintain a predetermined axial spacing between said cam plate and said base plate, a spring connected between each pivot pin on said weight base and each post, and a magnetic pickup including a coil winding and a permanent magnet, said pole piece operative to cause an ignition timing voltage to be induced in said coil winding when it is rotatably driven by said shaft.

Claim 6

An ignition controL device for developing an ignition timing control voltage for an ignition system comprising, a base member, a shaft rotatably supported by said base member, a weight plate connected directly to said shaft having a pair of openings, a pair of pivot pins carried by said weight plate, a flyweight pivotally supported by each pivot pin, an ignition timing control device located on one side of said weight plate including a laterally extending base plate and a pole piece having a plurality of teeth, said timing control device being rotatably supported by said shaft and rotatably adjustable relative to said shaft, a cam plate located on an opposite side of said weight plate having outer wall sections respectively engaging said flyweights, a pair of posts rigidly connecting said cam plate and said base plate whereby said cam plate and timing control device rotate together, each of said posts extending through a respective opening in said weight plate and connected to said base plate and cam plate at points disposed on opposite sides of said weight plate, said posts serving to maintain a predetermined axial spacing between said cam plate and said base plate, a spring connected between each pivot pin on said weight base and each post, and a magnetic pickup including a coil winding and a permanent magnet, said pole piece operative to cause an ignition timing voltage to be induced in said coil winding when it is rotatably driven by said shaft.

Claim 7

An ignition distributor of the magnetic pickup type comprising, a base member, a shaft rotatably supported by said base member adapted to be rotatably driven by an internal combustion engine, a weight base secured to one end of said shaft having a pair of spaced openings, pivot pins carried by said weight base, a flyweight pivoted on each pivot pin, said flyweights disposed above said weight base, a base plate located below said weight base, a pole piece connected to said base plate forming part of a magnetic pickup, said pole piece disposed about said shaft and rotatably adjustable relative to said shaft as a function of shaft speed, first and second post members fixed to said base plate, said post members extending upwardly through said openings formed in said weight base, a cam plate disposed above said weight base connected with said post members whereby said cam plate and said pole piece move together and are rotatably adjustable relative to said shaft, said cam plate having outer contoured wall sections respectively engaging inner surfaces of said flyweights to adjust said cam plate and pole piece relative to said shaft as a function of engine speed, and a spring connected respectively between each pivot pin and each post.

Claim 8

An ignition distributor of the magnetic pickup type comprising, a base member, a shaft rotatably supported by said base member adapted to be rotatably driven by an internal combustion engine, a weight base secured to one end of said shaft having a pair of spaced openings, pivot pins carried by said weight base, a flyweight pivoted on each pivot pin, said flyweights disposed above said weight base, a base plate located below said weight base, a pole piece connected to said base plate forming part of a magnetic pickup, said pole piece disposed about said shaft and rotatably adjustable relative to said shaft as a function of shaft speed, first and second post members fixed to said base plate, said post members extending upwardly through said openings formed in said weight base, a cam plate disposed above said weight base connected with said post members whereby said cam plate and said pole piece move together and are rotatably adjustable relative to said shaft, said cam plate having outer contoured wall sections respectively engaging inner surfaces of said flyweights to adjust said cam plate and pole piece relative to said shaft as a function of engine speed, and a spring connected respectively between each pivot pin and each post.

Claim 9

An ignition control device for an internal combustion engine having a centrifugal advance mechanism for rotatably advancing a timing control member relative to a driving shaft as a function of shaft speed comprising, a base member, a shaft rotatably supported by said base member, a weight plate secured directly to said shaft, pivot pins carried by said weight plate, a flyweight pivotally supported by each pivot pin, a cam plate, a timing control member supported for adjustable movement relative to said shaft, a pair of posts rigidly connected between said cam plate and timing control member whereby they rotate together, and a spring connected between each pivot pin and each post, the amount of pivotal movement of each flyweight about its respective pivot pin being a function of shaft speed, said cam plate having curved outer surfaces located adjacent opposite ends thereof respectively engaging said flyweights and having straight outer surfaces extending inwardly from said curved surfaces toward the center of said cam plate, said straight surfaces located respectively on opposite sides of said cam plate, said flyweights having complementary straight inner surfaces, said flyweights, by pivotal movement, operative to advance said cam plate and timing control member relative to said shaft by engagement of said flywEights with said curved outer surfaces of said cam plate at speeds below a predetermined speed of rotation of said shaft, said flyweights being pivoted to positions wherein said straight inner surfaces of said flyweights engage respectively said straight outer surfaces on the opposite sides of said cam plate in line contact and over a predetermined length of contact when said shaft attains said predetermined speed, the engagement of said straight surfaces on said flyweights with said straight surfaces located on opposiste sides of said cam plate comprising means for preventing further advance of said cam plate and timing control member relative to said shaft when said shaft attains said predetermined speed.

Claim 10

An ignition control device for an internal combustion engine having a centrifugal advance mechanism for rotatably advancing a timing control member relative to a driving shaft as a function of shaft speed comprising, a base member, a shaft rotatably supported by said base member, a weight plate secured directly to said shaft, pivot pins carried by said weight plate, a flyweight pivotally supported by each pivot pin, a cam plate, a timing control member supported for adjustable movement relative to said shaft, a pair of posts rigidly connected between said cam plate and timing control member whereby they rotate together, and a spring connected between each pivot pin and each post, the amount of pivotal movement of each flyweight about its respective pivot pin being a function of shaft speed, said cam plate having curved outer surfaces located adjacent opposite ends thereof respectively engaging said flyweights and having straight outer surfaces extending inwardly from said curved surfaces toward the center of said cam plate, said straight surfaces located respectively on opposite sides of said cam plate, said flyweights having complementary straight inner surfaces, said flyweights, by pivotal movement, operative to advance said cam plate and timing control member relative to said shaft by engagement of said flywEights with said curved outer surfaces of said cam plate at speeds below a predetermined speed of rotation of said shaft, said flyweights being pivoted to positions wherein said straight inner surfaces of said flyweights engage respectively said straight outer surfaces on the opposite sides of said cam plate in line contact and over a predetermined length of contact when said shaft attains said predetermined speed, the engagement of said straight surfaces on said flyweights with said straight surfaces located on opposiste sides of said cam plate comprising means for preventing further advance of said cam plate and timing control member relative to said shaft when said shaft attains said predetermined speed.

Claim 11

A centrifugal advance mechanism for an ignition distributor for advancing a timing member relative to the driving shaft as a function of shaft speed comprising, an ignition distributor having a base member, a shaft rotatably supported by said base member, a weight plate secured to one end of said shaft, first and second pivot pins carried by said weight plate, a flyweight pivotally supported by each pivot pin, first and second spaced openings formed in said weight plate, a cam plate, said cam plate having outer cam surfaces engaging respectively inner surfaces of said flyweights whereby said cam plate is advanced relative to said shaft by movement of said flyweights in response to shaft speed, a timing member disposed about said shaft rotatably adjustable relative to said shaft, post means rigidly connected between said cam plate and said timing member passing through said openings formed in said weight plate whereby said cam plate and timing member rotate together, a spring interposed between each post means and a respective pivot pin, and means for prevening further advance of said timing member relative to said shaft when a predetermined shaft speed is attained, said last named means comprising straight surfaces formed respectively on said cam plate and on said flyweights which become engaged in line contact when said shaft reaches said predetermined speed.

Claim 12

A centrifugal advance mechanism for an ignition distributor for advancing a timing member relative to the driving shaft as a function of shaft speed comprising, an ignition distributor having a base member, a shaft rotatably supported by said base member, a weight plate secured to one end of said shaft, first and second pivot pins carried by said weight plate, a flyweight pivotally supported by each pivot pin, first and second spaced openings formed in said weight plate, a cam plate, said cam plate having outer cam surfaces engaging respectively inner surfaces of said flyweights whereby said cam plate is advanced relative to said shaft by movement of said flyweights in response to shaft speed, a timing member disposed about said shaft rotatably adjustable relative to said shaft, post means rigidly connected between said cam plate and said timing member passing through said openings formed in said weight plate whereby said cam plate and timing member rotate together, a spring interposed between each post means and a respective pivot pin, and means for prevening further advance of said timing member relative to said shaft when a predetermined shaft speed is attained, said last named means comprising straight surfaces formed respectively on said cam plate and on said flyweights which become engaged in line contact when said shaft reaches said predetermined speed.

Claim 13

A centrifugal advance mechanism for adjusting a timing member of an ignition distributor relative to a driving shaft comprising, a distributor having a base, a shaft rotatably supported by said base, a timing member disposed about said shaft and rotatably adjustable relative thereto, a weight plate secured to said shaft having a pair of pivot pins secured thereto, said weight plate having a pair of openings, a flyweight pivotally supported by each pivot pin, a cam plate having outer contoured wall sections respectively engaging inner surfaces of said flyweights whereby said cam plate is rotatably adjusted relative to said shaft by movement of said flyweights, first and second posts connected to said timing member, means removably connecting said cam plate to said posts, said posts passing respectively through said openings in said weight plate, said posts connected to said cam plate and said timing member at points located on opposite sides of said weight plate whereby said cam plate and timing member are rotatably adjustable together relative to said shaft, and a spring interposed between each post and each pivot pin.

Claim 14

A centrifugal advance mechanism for adjusting a timing member of an ignition distributor relative to a driving shaft comprising, a distributor having a base, a shaft rotatably supported by said base, a timing member disposed about said shaft and rotatably adjustable relative thereto, a weight plate secured to said shaft having a pair of pivot pins secured thereto, said weight plate having a pair of openings, a flyweight pivotally supported by each pivot pin, a cam plate having outer contoured wall sections respectively engaging inner surfaces of said flyweights whereby said cam plate is rotatably adjusted relative to said shaft by movement of said flyweights, first and second posts connected to said timing member, means removably connecting said cam plate to said posts, said posts passing respectively through said openings in said weight plate, said posts connected to said cam plate and said timing member at points located on opposite sides of said weight plate whereby said cam plate and timing member are rotatably adjustable together relative to said shaft, and a spring interposed between each post and each pivot pin.

Claim 15

A centrifugal advance mechanism for advancing a magnetic hole piece relative to the driving shaft of a magnetic pickup type of distributor comprising, a distributor having a base member, a shaft rotatably supported by said base member, a bushing disposed about said shaft, a pole piece formed of magnetic material having a plurality of teeth supported by said bushing and rotatable therewith, a base plate secured to said bushing and rotatable therewith, a weight plate connected to one end of said shaft, said weight plate having first and second openings, first and second pivot pins carried by said weight plate, a flyweight pivotally supported by each pivot pin, a cam plate having an outer contour engaging inner surfaces of said flyweights to advance said cam plate relative to said shaft during movement of said flyweights, first and second post members secured to said base plate extending axially therefrom through said openings in said weight plate, said cam plate being secured to said post members, a spring connected between each post member and pivot pin, a rotor member formed of insulating material carrying an electrical contact, said rotor member secured to said base plate, a central opening in said cam plate, and an annular boss formed on the inner surface of said rotor member positioned within said opening in said cam plate, the end of said boss engaging the end of said shaft, said rotor member serving to prevent relative axial movement between parts of said centrifugal advance mechanism.

Claim 16

A centrifugal advance mechanism for advancing a magnetic hole piece relative to the driving shaft of a magnetic pickup type of distributor comprising, a distributor having a base member, a shaft rotatably supported by said base member, a bushing disposed about said shaft, a pole piece formed of magnetic material having a plurality of teeth supported by said bushing and rotatable therewith, a base plate secured to said bushing and rotatable therewith, a weight plate connected to one end of said shaft, said weight plate having first and second openings, first and second pivot pins carried by said weight plate, a flyweight pivotally supported by each pivot pin, a cam plate having an outer contour engaging inner surfaces of said flyweights to advance said cam plate relative to said shaft during movement of said flyweights, first and second post members secured to said base plate extending axially therefrom through said openings in said weight plate, said cam plate being secured to said post members, a spring connected between each post member and pivot pin, a rotor member formed of insulating material carrying an electrical contact, said rotor member secured to said base plate, a central opening in said cam plate, and an annular boss formed on the inner surface of said rotor member positioned within said opening in said cam plate, the end of said boss engaging the end of said shaft, said rotor member serving to prevent relative axial movement between parts of said centrifugal advance mechanism.