US 11,629,928 B1 · Cranking mechanism

Abstract

A cranking mechanism preferably includes a planetary gear, a drive shaft, a one way bearing, a clutch assembly, and at least one drive unit. The clutch preferably includes a clutch pressure plate, a flywheel, friction surfaces and at least one friction plate. Each drive unit includes a carrier, a spool and a flywheel. The one way bearing and the clutch assembly are axial on the drive shaft. A pressure locking nut is threaded on to a threaded end of the crank shaft to exert pressure on the clutch assembly. The sun gear is fixed on the drive shaft. The at least one drive unit is axial with the drive shaft, and fixed with the carrier of the planetary gear set. The pressure locking nut is tightened against the clutch assembly to frictionally engage the drive shaft with the at least one drive unit.

Claims15

Dependent claims

A cranking mechanism for a crossbow comprising:

a planetary gear set includes a sun gear, a plurality of planet gears and a ring gear, said ring gear is stationary and concentric relative to said sun gear;
a drive shaft includes a first driven end and a second drive end, a sun gear is retained on said second drive end;
a spool includes a plurality of pins extending from one side thereof to rotatably retain said plurality of planet gears, said sun gear causes rotation of said plurality of planet gears, said plurality of planet gears also engage said ring gear, wherein rotation of said plurality of planet gears causes rotation of said spool and
an elongated connecting device includes a spool end, said spool end is fixed to a winding diameter of said spool, wherein rotation of said drive shaft winds said elongated connecting device on said winding diameter;
wherein said cranking mechanism for the crossbow is one of an integral portion of the crossbow and removable from the crossbow.

2 more elements

A cranking mechanism for a crossbow comprising:

a planetary gear set includes a sun gear, a plurality of planet gears and a ring gear, said ring gear is stationary and concentric relative to said sun gear;
a drive shaft includes a first driven end and a second drive end, a sun gear is retained on said second drive end;
a spool includes a plurality of pins extending from one side thereof to rotatably retain said plurality of planet gears, said sun gear causes rotation of said plurality of planet gears, said plurality of planet gears also engage said ring gear, wherein rotation of said plurality of planet gears causes rotation of said spool;
an elongated connecting device includes a spool end and a string end, said spool end is fixed to a winding diameter of said spool, wherein said string end is coupled to a string of the crossbow;
a clutch is retained on said drive shaft;
a one-way bearing rotation device is engaged with said clutch, axial tension is applied to said one-way bearing and said clutch in a first direction through said driven end to wind said elongated connecting device on said spool;
and
wherein said cranking mechanism for the crossbow is one of an integral portion of the crossbow and removable from the crossbow.

5 more elements

Dependencies are inferred from the claim text.

Cranking mechanism

Life of this patent

Cranking mechanism

Life of this patent

Abstract

Claims15