Patent ID: 7676934
Filing Date: 2010-03-16
Classification: B27B,Y10T

Abstract:
1. A keyless adjusting mechanism for a chain saw, comprising: a protection cover having a central hole; an adjusting ring having a driver gear axially extended from a first end surface thereof, the adjusting ring being connected to the central hole of the protection cover; an adjusting bolt disposed at the protection cover and having a driven gear secured thereon for engaging with the driver gear; an adjusting stud having a threaded hole for engaging with the adjusting bolt; wherein the driver gear, the driven gear and the adjusting bolt bring the adjusting stud to move axially along the adjusting bolt when the adjusting ring is rotated; and a knob coupled to the adjusting ring, the knob having a handle that is slidable to extend out from a rim of the knob, so as to provide a larger torque for twisting the adjusting ring than only using the knob; and wherein the adjusting ring has a second end surface opposite the first end surface, and the second end surface has a knob recess for receiving the knob, and the knob recess is concentric with the adjusting ring.