Drive system for bicycles and other apparatus

Claim 2

A drive system for driving a driven device such as the rear wheel of a bicycle or the like comprising; input force applying means for applying force to the drive system; rotatable output force transfer means for transferring output force to the driven device; mounting means for rotatably mounting said rotatable output force transfer means and enabling rotation thereof relative to said mounting means in at least one direction; input force transfer means for transferring input force from said input force applying means to said rotatable output force transfer means to cause rotation thereof in the one direction and transfer of output force to the driven device; and input-output force correlation means operatively associated with said input force transfer means for correlating input-output forces by rotative displacement of said rotatable output force transfer means relative to said input force transfer means during each revolution of the drive system, which comprises cam means mounted in juxtaposition to and operative relationship with said rotatable output force transfer means and said input force transfer means for controlling the amount and location of the relative rotative displacement therebetween during each revolution of the drive system; and wherein said cam means comprises: cam track means having a continuous cam surface extending 360° about the axis of rotation of said rotatable output force means for variably changing the rotational speed and circumferential location of said output force transfer means relative to said input force transfer means; and cam follower means movably mounted on said cam surface in said cam track for causing relative movement between said cam track means and said follower means during each revolution of the drive system.

Claim 3

The invention as defined in claim 1 and wherein said input-output force correlating means further comprising: oscillator means being operatively connected to said cam follower means and to said rotatable output force transfer means for causing rotative displacement of said rotatable output force transfer means relative to said oscillator means.

Claim 4

The invention as defined in claim 2 and wherein: said oscillator means being connected to and movable with said input force transfer means for continuous movement therewith along a circular path during each revolution of the drive system.

Claim 5

The invention as defined in claim 3 and wherein: there being at least a pair of said cam follower means and said oscillator means spaced 180° from one another.

Claim 6

The invention as defined in claim 4 and wherein said oscillator means comprising: pivotal connecting means for connecting a portion of said oscillator means to said input force transfer means; first connecting means for connecting one end portion of said oscillator means to said cam follower means for causing pivotal movement of said oscillator means; and second connecting means for connecting the other end portion of said oscillating means to said rotatable output force transfer means for causing rotative displacement thereof.

Claim 7

The invention as defined in claim 5 and wherein said input force transfer means comprising: at least one crank arm member extending radially relative to the central axis of rotation of said rotatable output force transfer means; a crank shaft mounted in coaxial relationship with said rotatable output force transfer means and mounting and connecting said crank arm member; said crank arm member having a mid portion connected to said crank shaft and an end portion extending radially beyond said crank shaft; one of said oscillator means being mounted on said end portion of said crank arm member; and the other of said oscillator members being mounted on said crank arm member on the radially opposite side of the crank shaft.

Claim 8

The invention as defined in claim 6 and further comprising: hub means mounted on the frame of the bicycle for rotatably supporting said crank shaft; said mounting means comprising an annular plate member having an annular outermost peripheral surface and being fixedly mounted on one end of said hub means axially next adjacent said crank arm member; said cam track means being located on a side surface of said plate facing said crank arm member; and said oscillator means being located between said plate member and said crank arm member.

Claim 9

The invention as defined in claim 7 and wherein said plate member comprising: a radially innermost portion mounted on one end of said hub means next adjacent said crank arm member.

Claim 10

The invention as defined in claim 8 and further comprising: bearing means mounted in a central bore in said radially innermost portion for rotatably supporting said said crank shaft.

Claim 11

The invention as defined in claim 8 and wherein: said radially innermost portion having an axially inwardly extending radially outermost peripheral surface defining said cam surface.

Claim 12

The invention as defined in claim 10 and wherein said plate member further comprising: a radially intermediate radially outwardly extending first portion which is axially inwardly offset relative to said radially innermost portion; and a radially intermediate axially outwardly extending second portion connected to said first portion and being located in radially outwardly spaced parallel relationship to said cam surface to define said cam track means.

Claim 13

The invention as defined in claim 11 and wherein said plate member further comprising: a radially outermost radially outwardly extending portion located parallel with said radially innermost portion and being axially aligned with said bearing means.

Claim 14

An input-output force correlated drive system for driving a driven device such as the rear wheel of a bicycle or the like comprising: input force applying means for transmitting input force to and causing operation of the drive system; rotatable output force transfer means operable by said input force applying means for transferring output force to the driven device; and input-output force correlation means being continuously operatively connected to and operable by said input force applying means and being continuously operatively connected to and operating said output force transfer means for variably changing the rotational speed and circumferential location of said output force transfer means relative to said input force applying means during each revolution in accordance with predetermined input-output force correlation characteristics to be provided by the drive system, which comprises cam means mounted in juxtaposition to and operative relationship with said rotatable output force transfer means and said input force applying means for controlling the amount and location of the relative rotative displacement therebetween during each revolution of the drive system; and wherein said cam means comprises: cam track means having a continuous cam surface extending 360° about the axis of rotation of said rotatable output force means for variably changing the rotational speed and circumferential location of said output, force transfer means relative to said input force applying means; and cam follower means movably mounted on said cam surface in said cam track for causing relative movement between said cam track means and said follower means during each revolution of the drive system.

Claim 15

An input-output force correlated drive system for driving a driven device such as the rear wheel of a bicycle or the like comprising: input force applying means for transmitting input force to and causing operation of the drive system; rotatable output force transfer means operable by said input force applying means for transferring output force to the driven device; and input-output force correlation means being continuously operatively connected to and operable by said input force applying means and being continuously operatively connected to and operating said output force transfer means for variably changing the rotational speed and circumferential location of said output force transfer means relative to said input force applying means during each revolution in accordance with predetermined input-output force correlation characteristics to be provided by the drive system, which comprises cam means mounted in juxtaposition to and operative relationship with said rotatable output force transfer means and said input force applying means for controlling the amount and location of the relative rotative displacement therebetween during each revolution of the drive system; and wherein said cam means comprises: cam track means having a continuous cam surface extending 360° about the axis of rotation of said rotatable output force means for variably changing the rotational speed and circumferential location of said output, force transfer means relative to said input force applying means; and cam follower means movably mounted on said cam surface in said cam track for causing relative movement between said cam track means and said follower means during each revolution of the drive system.

Claim 16

The invention as defined in claims 1 or 12 and wherein said rotatable output force transfer means comprising: a rotatable sprocket member being connected to the rear wheel of a bicycle.

Claim 17

The invention as defined in claims 1 or 12 and wherein: said rotatable output force means comprising: a rotatable ring gear member having sprocket teeth on the outer periphery thereof and internal gear teeth on the inner periphery thereof; and said input-output force correlating means comprising sun gear means and planetary gear means.

Claim 18

The invention as defined in claims 1 or 12 and wherein said input-output force correlating means comprising: a planetary gear system having a sun gear member, a plurality of planet gear members, and a ring gear member.

Claim 19

The invention as defined in claim 16 and wherein said rotatable output force transfer means comprising: sprocket teeth means on the outer periphery of said ring gear member for receiving and driving a chain.

Claim 20

The invention as defined in claims 1 or 12 and wherein: said input force applying means comprising: rotatable crank shaft means mounted on a bicycle and a pair of pedal operated crank arm means connected to opposite end portions of said crank shaft means for operation by a bicycle rider; said output force transfer means comprising a rotatable ring member having inner and outer peripheral surfaces with sprocket teeth on the outer peripheral surface to engage and drive a chain operatively connected to the rear wheel of the bicycle; and said input-output force correlating means comprising: oscillator means pivotally connected to and being continuously movable with said crank arm means in a circular path during each revolution thereof; cam follower means mounted on said oscillator member for controlling pivotal movement thereof; cam means fixedly mounted relative to said oscillator means and being engageable with said cam follower means during each revolution of said crank arm means for causing controlled variable pivotal displacement of said oscillator means relative to said crank arm means during each revolution thereof; ring gear means on the inner peripheral surface of said rotatable ring member for causing rotation thereof; planet gear means engaged with said ring gear means and being connected to and movable with said oscillator means for causing rotation of said ring gear means; and sun gear means engaged with said planet gear means for causing rotation thereof.

Claim 21

The invention as defined in claims 1 or 12 and wherein said input force transfer means comprising: drive shaft means being mounted in coaxial relationship with said rotatable output force transfer means and having a splined portion thereon for causing rotation of said output force transfer means; a splined member mounted on said splined portion of said drive shaft means and being rotatably driven thereby and being axially displaceable relative thereto; and pin and slot connecting means between said splined member and said rotatable output force transfer means for rotatably drivingly connecting said splined member to said rotatable output force transfer means and enabling forward and rearward rotative displacement of said rotatable output force transfer means relative to said input force transfer means.

Claim 22

The invention as defined in claim 19 and wherein said input-output force correlation means comprising: a continuous cam surface extending 360° about said drive shaft means and being located in juxtaposition to said splined member; and cam follower means mounted on said splined member and being engaged with said cam surface for causing axial displacement of said splined member during rotation thereof by said drive shaft means.

Claim 23

An input-output force correlated drive system for driving a driven device such as the rear wheel of a bicycle or the like comprising: input force applying means for transmitting input force to and causing operation of the drive system; rotatable output force transfer means operable by said input force applying means for transferring output force to the driven device; and input-output force correlation means being continuously operatively connected to and operable by said input force applying means and being continuously operatively connected to and operating said output force transfer means for variably changing the rotational speed and circumferential location of said output force transfer means relative to said input force applying means during each revolution in accordance with predetermined input-output force correlation characteristics to be provided by the drive system; slot means on and rotatable with said rotatable output force transfer means for providing variably radially spaced locations of transfer of input force to said output force transfer means; pin means associated with said input force transfer means and being received in said slot means for transferring force to said output force transfer means at variable radially spaced locations; said slot means being inclined relative to a radial line extending from the axis of rotation of said output force transfer means; adjustable mounting means for rotatably mounting said slot means on said output force transfer means and selectively changing the angle of inclination of said slot means and comprising: a rotatable plug member being rotatably mounted on said output force transfer means; a driven gear means provided on said rotatable plug means for causing rotation thereof; and a drive gear means provided on said output force transfer means for driving engagement with said driven gear means to selectively cause rotation thereof.

Claim 24

An input-output force correlated drive system for driving a driven device such as the rear wheel of a bicycle or the like comprising: input force applying means for transmitting input force to and causing operation of the drive system; rotatable output force transfer means operable by said input force applying means for transferring output force to the driven device; and input-output force correlation means being continuously operatively connected to and operable by said input force applying means and being continuously operatively connected to and operating said output force transfer means for variably changing the rotational speed and circumferential location of said output force transfer means relative to said input force applying means during each revolution in accordance with predetermined input-output force correlation characteristics to be provided by the drive system; slot means on and rotatable with said rotatable output force transfer means for providing variably radially spaced locations of transfer of input force to said output force transfer means; pin means associated with said input force transfer means and being received in said slot means for transferring force to said output force transfer means at variable radially spaced locations; said slot means being inclined relative to a radial line extending from the axis of rotation of said output force transfer means; adjustable mounting means for rotatably mounting said slot means on said output force transfer means and selectively changing the angle of inclination of said slot means and comprising: a rotatable plug member being rotatably mounted on said output force transfer means; a driven gear means provided on said rotatable plug means for causing rotation thereof; and a drive gear means provided on said output force transfer means for driving engagement with said driven gear means to selectively cause rotation thereof.

Claim 25

The invention as defined in claim 21 and wherein: said drive gear means comprising a worm gear; and said drive gear means comprising a spiral gear.

Claim 26

A drive system for driving a driven device such as the rear wheel of a bicycle or the like comprising: input force applying means for applying force to the drive system; rotatable output force transfer means for transferring output force to the driven device; mounting means for rotatably mounting said rotatable output force transfer means and enabling rotation thereof relative to said mounting means in at least one direction; input force transfer means for transferring input force from said input force applying means to said rotatable output force transfer means to cause rotation thereof in the one direction and transfer of output force to the driven device; input-output force correlation means operatively associated with said input force transfer means for correlating input-output forces by rotative displacement of said rotatable output force transfer means relative to said input force transfer means during each revolution of the drive system; said input force applying means comprising rotatable crank shaft means mounted on a bicycle and a pair of pedal operated crank arm means connected to opposite end portions of said crank shaft means for operation by a bicycle rider; said output force transfer means comprising a rotatable ring member having inner and outer peripheral surfaces with sprocket teeth on the outer peripheral surface to engage and drive a chain operatively connected to the rear wheel of the bicycle; and said input-output force correlating means comprising: oscillator means pivotally connected to and being continuously movable with said crank arm means in a circular path during each revolution thereof; cam follower means mounted on said oscillator member for controlling pivotal movement thereof; cam means fixedly mounted relative to said oscillator means and being engageable with said cam follower means during each revolution of said crank arm means for causing controlled variable pivotal displacement of said oscillator means relative to said crank arm means during each revolution thereof; ring gear means on the inner peripheral surface of said rotatable ring member for causing rotation thereof; planet gear means engaged with said ring gear means and being connected to and movable with said oscillator means; and sun gear means engaged with said planet gear means for causing rotation thereof.

Claim 27

A drive system for driving a driven device such as the rear wheel of a bicycle or the like comprising: input force applying means for applying force to the drive system; rotatable output force transfer means for transferring output force to the driven device; mounting means for rotatably mounting said rotatable output force transfer means and enabling rotation thereof relative to said mounting means in at least one direction; input force transfer means for transferring input force from said input force applying means to said rotatable output force transfer means to cause rotation thereof in the one direction and transfer of output force to the driven device; input-output force correlation means operatively associated with said input force transfer means for correlating input-output forces by rotative displacement of said rotatable output force transfer means relative to said input force transfer means during each revolution of the drive system; said input force applying means comprising rotatable crank shaft means mounted on a bicycle and a pair of pedal operated crank arm means connected to opposite end portions of said crank shaft means for operation by a bicycle rider; said output force transfer means comprising a rotatable ring member having inner and outer peripheral surfaces with sprocket teeth on the outer peripheral surface to engage and drive a chain operatively connected to the rear wheel of the bicycle; and said input-output force correlating means comprising: oscillator means pivotally connected to and being continuously movable with said crank arm means in a circular path during each revolution thereof; cam follower means mounted on said oscillator member for controlling pivotal movement thereof; cam means fixedly mounted relative to said oscillator means and being engageable with said cam follower means during each revolution of said crank arm means for causing controlled variable pivotal displacement of said oscillator means relative to said crank arm means during each revolution thereof; ring gear means on the inner peripheral surface of said rotatable ring member for causing rotation thereof; planet gear means engaged with said ring gear means and being connected to and movable with said oscillator means; and sun gear means engaged with said planet gear means for causing rotation thereof.

Claim 28

The invention as defined in claims 1 or 13 or 21 or 23 wherein said input-output force correlating means comprising: pin and slot connecting means between said rotatable output force transfer means and said input force transfer means for enabling relative rotative displacement therebetween.

Claim 29

The invention as defined in claim 24 and wherein said pin and slot connecting means comprising: slot means on and rotatable with said rotatable output force transfer means for providing variably radially spaced locations of transfer of input force to said output force transfer means; and pin means associated with said input force transfer means and being received in said slot means for transferring force to said output force transfer means at variable radially spaced locations.

Claim 30

The invention as defined in claim 25 and wherein: said slot means being inclined relative to a radial line extending from the axis of rotation of said output force transfer means.

Claim 31

The invention as defined in claim 26 and further comprising: adjustable slot mounting means for rotatably mounting said slot means on said output force transfer means and selectively changing the angle of inclination of said slot means.

Claim 32

The invention as defined in claim 27 and wherein said adjustable slot mounting means comprising: a rotatable plug member being rotatably mounted on said output force transfer means; a driven gear means provided on said rotatable plug means for causing rotation thereof; and a drive gear means provided on said output force transfer means for driving engagement with said driven gear means to selectively cause rotation thereof.

Claim 33

The invention as defined in claim 28 and wherein: said drive gear means comprising a worm gear; and said drive gear means comprising a spiral gear.

Claim 34

The invention as defined in claim 29 and wherein: said output force transfer means comprising a sprocket wheel member; said input force transfer means comprising a pedal operated crank arm member located axially adjacent said sprocket wheel member, a slider member mounted on said crank arm member for variable radial inward and outward displacement relative thereto, a shaft member mounted on said slider member and extending axially therefrom and having a portion variably radially located in said slot means; and cam means mounted in juxtaposition to and operative relationship with said shaft member for controlling the radial location of said shaft in said slot means.

Claim 35

An input-output force correlated drive system for driving a driven device such as the rear wheel of a bicycle or the like comprising: input force applying means for transmitting input force to and causing operation of the drive system; rotatable output force transfer means operable by said input force applying means for transferring output force to the driven device; and input-output force correlation means being continuously operatively connected to and operable by said input force applying means and being continuously operatively connected to and operating said output force transfer means for variably changing the rotational speed and circumferential location of said output force transfer means relative to said input force applying means during each revolution in accordance with predetermined input-output force correlation characteristics to be provided by the drive system; said input force applying means comprising and a pair of pedal operated crank arm means connected to opposite end portions of said crank shaft means for operation by a bicycle rider; said output force transfer means comprising a rotatable ring member having inner and outer peripheral surfaces with sprocket teeth on the outer peripheral surface to engage and drive a chain operatively connected to the rear wheel of the bicycle; and said input-output force correlating means comprising; oscillator means pivotally conneced to and being continuously movable with said crank arm means in a circular path during each revolution thereof; cam follower means mounted on said oscillator member for controlling pivotal movement thereof; cam means fixedly mounted relative to said oscillator means and being engageable with said cam follower means during each revolution of said crank arm means for causing controlled variable pivotal displacement of said oscillator means relative to said crank arm means during each revolution thereof; ring gear means on the inner peripheral surface of said rotatable ring member for causing rotation thereof; planet gear means engaged with said ring gear means and being connected to and movable with said oscillator means for causing rotation of said ring gear means; and sun gear means engaged with said planet gear means for causing rotation thereof.

Claim 36

An input-output force correlated drive system for driving a driven device such as the rear wheel of a bicycle or the like comprising: input force applying means for transmitting input force to and causing operation of the drive system; rotatable output force transfer means operable by said input force applying means for transferring output force to the driven device; and input-output force correlation means being continuously operatively connected to and operable by said input force applying means and being continuously operatively connected to and operating said output force transfer means for variably changing the rotational speed and circumferential location of said output force transfer means relative to said input force applying means during each revolution in accordance with predetermined input-output force correlation characteristics to be provided by the drive system; said input force applying means comprising and a pair of pedal operated crank arm means connected to opposite end portions of said crank shaft means for operation by a bicycle rider; said output force transfer means comprising a rotatable ring member having inner and outer peripheral surfaces with sprocket teeth on the outer peripheral surface to engage and drive a chain operatively connected to the rear wheel of the bicycle; and said input-output force correlating means comprising; oscillator means pivotally conneced to and being continuously movable with said crank arm means in a circular path during each revolution thereof; cam follower means mounted on said oscillator member for controlling pivotal movement thereof; cam means fixedly mounted relative to said oscillator means and being engageable with said cam follower means during each revolution of said crank arm means for causing controlled variable pivotal displacement of said oscillator means relative to said crank arm means during each revolution thereof; ring gear means on the inner peripheral surface of said rotatable ring member for causing rotation thereof; planet gear means engaged with said ring gear means and being connected to and movable with said oscillator means for causing rotation of said ring gear means; and sun gear means engaged with said planet gear means for causing rotation thereof.

Claim 37

A drive system for driving the rear wheel of a bicycle or the like comprising; input force applying means for applying force to the drive system; rotatable output force transfer means for transferring output force to the rear wheel of the bicycle; mounting means for rotatably mounting said rotatable output force transfer means and enabling rotation thereof relative to said mounting means in both forward and rearward directions; input force transfer means for transferring input force from said input force applying means to said rotatable output force transfer means to cause rotation thereof in the forward direction and transfer of output force to the rear wheel; input-output force correlation means operatively associated with said input force transfer means for correlating input-output forces by forward and rearward relative rotative displacement of said rotatable output force transfer means and said input force transfer means during each revolution of the drive system; said input force applying means comprising rotatable crank shaft means mounted on the bicycle and a pair of pedal operated crank wire means connected to opposite end portions of said crank shaft means for operation by a bicycle rider; said output force transfer means comprising a rotatable ring member having inner and outer peripheral surfaces with sprocket teeth on the outer peripheral surface to engage and drive a chian operatively connected to the rear wheel of the bicycle; and said input-output force correlating means comprising: oscillator means pivotally connected to and being continuously movable with said crank arm means in a circular path each revolution thereof; cam follower means mounted on said oscillator member for controlling pivotal movement thereof; cam means fixedly mounted relative to said oscillator means and being engageable with said cam follower means during each revolution of said crank arm means for causing controlled variable pivotal displacement of said oscillator means relative to said crank arm means during each revolution thereof; ring gear means on the inner peripheral surface of said rotatable ring member for causing rotation thereof; planet gear means engaged with said ring gear means and being connected to and movable with said oscillator means for causing rotation of said ring gear means; and sun gear means engaged with said planet gear means for causing rotation thereof.

Claim 38

A drive system for driving the rear wheel of a bicycle or the like comprising; input force applying means for applying force to the drive system; rotatable output force transfer means for transferring output force to the rear wheel of the bicycle; mounting means for rotatably mounting said rotatable output force transfer means and enabling rotation thereof relative to said mounting means in both forward and rearward directions; input force transfer means for transferring input force from said input force applying means to said rotatable output force transfer means to cause rotation thereof in the forward direction and transfer of output force to the rear wheel; input-output force correlation means operatively associated with said input force transfer means for correlating input-output forces by forward and rearward relative rotative displacement of said rotatable output force transfer means and said input force transfer means during each revolution of the drive system; said input force applying means comprising rotatable crank shaft means mounted on the bicycle and a pair of pedal operated crank wire means connected to opposite end portions of said crank shaft means for operation by a bicycle rider; said output force transfer means comprising a rotatable ring member having inner and outer peripheral surfaces with sprocket teeth on the outer peripheral surface to engage and drive a chian operatively connected to the rear wheel of the bicycle; and said input-output force correlating means comprising: oscillator means pivotally connected to and being continuously movable with said crank arm means in a circular path each revolution thereof; cam follower means mounted on said oscillator member for controlling pivotal movement thereof; cam means fixedly mounted relative to said oscillator means and being engageable with said cam follower means during each revolution of said crank arm means for causing controlled variable pivotal displacement of said oscillator means relative to said crank arm means during each revolution thereof; ring gear means on the inner peripheral surface of said rotatable ring member for causing rotation thereof; planet gear means engaged with said ring gear means and being connected to and movable with said oscillator means for causing rotation of said ring gear means; and sun gear means engaged with said planet gear means for causing rotation thereof.

Claim 39

An input-output force correlated drive system for driving a driven device such as the rear wheel of a bicycle or the like comprising: input force applying means for transmitting input force to and causing operation of the drive system; rotatable output force transfer means operable by said input force applying means for transferring output force to the driven device; input-output force correlation means being continuously operatively connected to and operable by said input force applying means and being continuously operatively connected to and operating said output force transfer means for variably changing the rotational speed and circumferential location of said output force transfer means relative to said input force applying means during each revolution in accordance with predetermined input-output force correlation characteristics to be provided by the drive system; drive shaft means being mounted in coaxial relationship with said rotatable output force transfer means and having a splined portion thereon for causing rotation of said output force transfer means; a splined member mounted on said splined portion of said drive shaft means and being rotatably driven thereby and being axially displaceable relative thereto; and pin and slot connecting means between said splined member and said rotatable output force transfer means for rotatably drivingly connecting said splined member to said rotatable output force transfer means and enabling rotative displacement of said rotatable output force transfer means relative to said input force transfer means.

Claim 40

An input-output force correlated drive system for driving a driven device such as the rear wheel of a bicycle or the like comprising: input force applying means for transmitting input force to and causing operation of the drive system; rotatable output force transfer means operable by said input force applying means for transferring output force to the driven device; input-output force correlation means being continuously operatively connected to and operable by said input force applying means and being continuously operatively connected to and operating said output force transfer means for variably changing the rotational speed and circumferential location of said output force transfer means relative to said input force applying means during each revolution in accordance with predetermined input-output force correlation characteristics to be provided by the drive system; drive shaft means being mounted in coaxial relationship with said rotatable output force transfer means and having a splined portion thereon for causing rotation of said output force transfer means; a splined member mounted on said splined portion of said drive shaft means and being rotatably driven thereby and being axially displaceable relative thereto; and pin and slot connecting means between said splined member and said rotatable output force transfer means for rotatably drivingly connecting said splined member to said rotatable output force transfer means and enabling rotative displacement of said rotatable output force transfer means relative to said input force transfer means.

Claim 41

The invention as defined in claim 33 and wherein said input-output force correlation means comprising: a continuous cam surface extending 360° about said drive shaft means and being located in juxtaposition to said splined member; and cam follower means mounted on said splined member and being engaged with said cam surface for causing axial displacement of said splined member during rotation thereof by said drive shaft means.