Patent ID: 7845057

Claim:
A crank puller for threading into an internally threaded hole on a crank to press against a crank axle associated with a chainwheel and enabling separation of the crank from the crank axle to facilitate subsequent dismounting of the chainwheel, comprising: a nut portion having a front end externally provided with threads meshing with the internally threaded hole on the crank for connecting the nut portion to the crank via engagement of the external threads with the internally threaded hole, a receiving space being provided in said front end, and a hex rear end having an internally threaded hollow bore axially extended from behind the receiving space into the hex rear end; a bolt portion provided on an outer surface with external threads for screwing into the internally threaded hollow bore of the nut portion, and including a rear end and a front end formed into a conical-bottomed hole; a head portion being a substantially T-shaped member having a diameter-expanded front end, a diameter-reduced neck section rearward extended from the front end, and a rear end located behind the neck section, the rear end being fitted in the conical-bottomed hole at the front end of the bolt portion; and a cap portion for press against the crank axle, and defining a rearward opened hollow recess corresponding to the front end of the head portion for assembling thereto; wherein, the bolt portion is turnable to forward press the cap portion against the crank axle while bringing the nut portion to move rearward relative to the bolt portion, so that the nut portion brings the crank connected thereto to move outward and separate from the crank axle to enable subsequent dismounting of the chainwheel.