| 摘要 |
An adjustable crank has a body, drive shaft, hollow shaft with inner threading with large pitch, screw installed in the hollow shaft and forming with it threaded joint, cup, roller bearing, irreversible screw and pin of crank installed on it. On the drive shaft, at distance of half of maximal value of length of controlled crank, inside the drive shaft gear shaft is installed, this is in engagement with hollow gear shaft with screw in it, this is installed coaxially with the drive shaft. The screw has at the end cylindrical flange with two placed symmetrically relative to its central axis radial slots in which cylindrical pins are installed, one ends of those have at the ends cylindrical heads, and the other ones are installed symmetrically with respect to axis of rotation of the drive shaft. One of the pins is pressed to gear shaft coaxially with it, and the other one is pressed to drive shaft, the flange is with screws fixed to the cup installed on roller bearing that is made as self-alignment bearing. |
