Motorcycle drive chain tensioner kit

Claim 2

A motorcycle drive chain tensioner kit for mounting on a tine formed by the fork carried on the drive wheel of a chain-driven motorcycle and comprising: a mounting clamp receivable over said tine and including removable fastening means for fastening said clamp to said tine; adjustment bracket for mounting from said mounting clamp and shiftable transversely with respect to said tine; adjustment means for adjusting the transverse shifting of said bracket with respect to said clamp; an elongated carrier arm carried pivotally on one end from said bracket and projecting along said chain to terminate in a free end; an idler sprocket at said free end and engaging said chain; bearing means mounting said sprocket from said free end; a torsion spring connected between said bracket and said arm; and tension setting means for setting the level of torque of said spring whereby said clamp may be fitted over said tine, said fastening means fastened, said bracket adjusted transversely to shift said sprocket into direct alignment with said chain, and said tension setting means set to cause said sprocket to apply a preselected tension to said chain.

Claim 3

A motorcycle drive chain tensioner kit as set forth in claim 1 wherein: said tension setting means includes a boss formed by said carrier arm, surrounding the pivot axis of said arm, and including a plurality of holes disposed about said axis and defining the circumference of a circle; and said torsion spring is anchored on one extremity to said bracket and is formed at its opposite extremity with a tip selectively receivable in said holes for applying different degrees of torque to said spring and corresponding different degrees of tension to said chain.

Claim 4

A motorcycle drive chain tensioner kit as set forth in claim 1 wherein: said tension setting means includes a boss formed by said carrier arm, surrounding the pivot axis of said arm, and formed with an axially outwardly opening pin-receiving hole; an index pin removably received in said hole; adjustment disc means overlying said boss, rotatable about said pivot axis, and including a plurality of index pin holes arranged on a circle around said pivot axis for selective receipt of said index pin; anchor means for anchoring one end of said torsion spring to said disc means; and connecting means connecting the opposite end of said torsion spring to said bracket whereby said index pin may be removed, said disc rotated to set the tension on said arm at a new setting and said index pin re-inserted to maintain said new setting.

Claim 5

A motorcycle drive chain tensioner kit as set forth in claim 1 that includes: vertical adjustment means for adjusting the vertical location of said one end of said carrier arm on said bracket.

Claim 6

A motorcycle drive chain tensioner kit as set forth in claim 1 that includes: sealing means for sealing said bearing means against entry of dirt and the like.

Claim 7

A motorcycle drive chain tensioner kit as set forth in claim 1 wherein: said bracket is formed with a polygonal, through hole; a pivot shaft formed on one extremity with a polygonal tip received complementally in said polygonal hole and carrying said one end of said carrier arm rotatably from its opposite end; and said torsion spring is coiled about said shaft and is anchored on one end to said carrier arm and has its opposite extremity formed to abut one side of said polygonal tip.

Claim 8

A motorcycle drive chain tnesioner device for mounting on a tine formed by the fork mounted on the drive wheel of a chain-driven motorcycle and comprising: a mount for mounting from said tin adjacent said chain; a pivot shaft carried on one end from said mount; a carrier arm formed on one extremity with a boss mounted rotatable from the end of said pivot shaft opposite said one end, said arm projecting along said chain to form a free end; an idler sprocket adjacent said free end and engaged with said chain; bearing means carrying said sprocket from said free end; a torsion spring surrounding said pivot shaft, connected on one end with said mount and formed on its opposite extremity with an adjustment tip; an annular disc surrounding said pivot shaft and interposed between said spring and said boss; anchor means for anchoring said adjustment tip to said disc; first index means on said boss; second index means including stops arranged on a circle about said disc and selectively engagable with said first index means to selectively stop said disc against rotation whereby said first index means may be disengaged from said first stop included in said second means and said disc rotated to set the tension on said chain at a new setting and said first index means engaged with a new second stop to maintain said new setting.

Claim 9

A motorcycle drive chain tnesioner device for mounting on a tine formed by the fork mounted on the drive wheel of a chain-driven motorcycle and comprising: a mount for mounting from said tin adjacent said chain; a pivot shaft carried on one end from said mount; a carrier arm formed on one extremity with a boss mounted rotatable from the end of said pivot shaft opposite said one end, said arm projecting along said chain to form a free end; an idler sprocket adjacent said free end and engaged with said chain; bearing means carrying said sprocket from said free end; a torsion spring surrounding said pivot shaft, connected on one end with said mount and formed on its opposite extremity with an adjustment tip; an annular disc surrounding said pivot shaft and interposed between said spring and said boss; anchor means for anchoring said adjustment tip to said disc; first index means on said boss; second index means including stops arranged on a circle about said disc and selectively engagable with said first index means to selectively stop said disc against rotation whereby said first index means may be disengaged from said first stop included in said second means and said disc rotated to set the tension on said chain at a new setting and said first index means engaged with a new second stop to maintain said new setting.

Claim 10

A motorcycle drive chain tensioner device according to claim 7 wherein: said mount includes a clamp received over said tine and including fastening means for tightening said clamp to said tine.

Claim 11

A motorcycle drive chain tensioner device according to claim 7 that includes: adjustment means for adjusting the position of said carrier arm transversely with respect to said tine.

Claim 12

A motorcycle drive chain tensioner device according to claim 7 wherein: said boss includes an index hole; said first index means includes an index pin removably received in said index hole; and said second index means includes holes formed in said disc to define said stops.