Externally adjustable cam timer

Claim 2

In a cam timing assembly adapted for mounting on a shaft and including a wheel rotably mounted on said shaft, an adjusting arm disposed in coplanar relationship with said wheel within a central recess therein and rigidly fixed to said shaft and first projecting stop means for securing said adjusting arm in a selected position relative of said wheel, the combination comprising: two regulating screws threaded through said adjusting arm to bear against opposite sides of said stop means, the position of said regulating screws in said adjusting arm adapted to establish said selected relative position; and a cover enclosing said assembly and having an access hole in registration with each regulating screw, each regulating screw being inclined to the face of said wheel whereby repositioning of each regulating screw can be achieved externally to said cover through an access hole.

Claim 3

A cam timing assembly in accordance with claim 1 wherein each regulating screw is adapted to lock where it is positioned.

Claim 4

A cam timing assembly in accordance with claim 1 wherein said adjusting arm is rigidly fixed with its central plane normal to said shaft and the long axis of said regulating screw is inclined with respect to said central plane.

Claim 5

A cam timing assembly in accordance with claim 3 wherein each inclination is such that the long axis of said regulating screw lies on a line extending from said stop means to beyond the periphery of said wheel without intercepting the edge forming the demarcation between said recess and said wheel.

Claim 6

A cam timing assembly in accordance with claim 1 wherein said wheel is the drive sprocket and said shaft is the cam shaft of an internal combustion engine and repositioning said regulating screws alters the cam timing of the engine.

Claim 7

In a cam timing assembly adapted for mounting on a shaft and including a wheel rotably mounted on said shaft, an adjusting arm disposed in coplanar relationship with said wheel within a central recess therein and rigidly fixed to said shaft and first and second projecting stop means for securing said adjusting arm in a selected position relative to said wheel, the combination comprising: at least one regulating screw threaded through said adjusting arm to bear against said first stop means, the position of said regulating screw in said adjusting arm adapted to establish said selected relative position; a spring attached between said adjusting arm and said second projecting stop means so as to provide a force in opposition to that provided by said regulating screw; and a cover enclosing said assembly and having an access hole in registration with said regulating Screw, said regulating screw being inclined to the face of said wheel whereby repositioning of said regulating screw can be achieved externally to said cover through said access hole.

Claim 8

In a cam timing assembly adapted for mounting on a shaft and including a wheel rotably mounted on said shaft, an adjusting arm disposed in coplanar relationship with said wheel within a central recess therein and rigidly fixed to said shaft and first and second projecting stop means for securing said adjusting arm in a selected position relative to said wheel, the combination comprising: at least one regulating screw threaded through said adjusting arm to bear against said first stop means, the position of said regulating screw in said adjusting arm adapted to establish said selected relative position; a spring attached between said adjusting arm and said second projecting stop means so as to provide a force in opposition to that provided by said regulating screw; and a cover enclosing said assembly and having an access hole in registration with said regulating Screw, said regulating screw being inclined to the face of said wheel whereby repositioning of said regulating screw can be achieved externally to said cover through said access hole.

Claim 9

A cam timing assembly for installation in engines having a cam mechanism driven by a cam shaft comprising: a sprocket wheel adapted for mounting on said cam shaft, said sprocket wheel having a central hub apertured to rotatably engage said cam shaft, a series of gear teeth disposed annularly to said hub, a web joining said hub and gear teeth and a lug projecting outwardly from said web, said web being displaced from the front face of said sprocket wheel to form a recess; and a cam timing adjusting arm for mounting in said recess and including attaching means for fixedly connecting said arm to said cam shaft in parallel relationship to the face of said sprocket wheel and control means for regulating the relative angular displacement between said sprocket wheel and said cam shaft, said control means including at least one regulating screw engaging said lug and projecting through said adjusting arm at an angle to the face of said sprocket wheel such that the long axis of said regulating screw lies on a line extending from said lug to beyond the perifery of said wheel without intercepting the edge forming the demarcation between said recess and the front face of said sprocket wheel whereby access to said screw for adjustment is readily achieved from the rim of said sprocket wheel.

Claim 10

A cam timing assembly for installation in engines having a cam mechanism driven by a cam shaft comprising: a sprocket wheel adapted for mounting on said cam shaft, said sprocket wheel having a central hub apertured to rotatably engage said cam shaft, a series of gear teeth disposed annularly to said hub, a web joining said hub and gear teeth and a lug projecting outwardly from said web, said web being displaced from the front face of said sprocket wheel to form a recess; and a cam timing adjusting arm for mounting in said recess and including attaching means for fixedly connecting said arm to said cam shaft in parallel relationship to the face of said sprocket wheel and control means for regulating the relative angular displacement between said sprocket wheel and said cam shaft, said control means including at least one regulating screw engaging said lug and projecting through said adjusting arm at an angle to the face of said sprocket wheel such that the long axis of said regulating screw lies on a line extending from said lug to beyond the perifery of said wheel without intercepting the edge forming the demarcation between said recess and the front face of said sprocket wheel whereby access to said screw for adjustment is readily achieved from the rim of said sprocket wheel.

Claim 11

A cam timing assembly in accordance with claim 7 wherein said control means includes a pair of oppositely disposed regulating screws projecting through said adjusting arm at an angle to the face of said sprocket wheel.

Claim 12

A cam timing assembly in accordance with claim 7 wherein said control means includes a spring acting in opposition to said regulating screw.