Patent ID: 7845057
Filing Date: 2010-12-07
Classification: B25B,Y10T

Abstract:
1. 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 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.