Motor saw, especially motor chain saw

In a motor driven chain saw having a chain drive sprocket adapted for being driven by the output shaft of the saw motor, a clutch having one element connected to the motor shaft and another element for driving the sprocket, said clutch elements being normally in driving engagement, and a follower member forming a part of one of said clutch elements and movable in the axial direction of the motor shaft during engaging and disengaging of the said clutch elements, said follower member having internal teeth thereon and the other clutch element having external teeth engageable with said internal teeth when the clutch is engaged, said one clutch element having a groove formed therein axially adjacent the region of the teeth thereof which is engaged by the teeth of said follower member when the clutch is engaged, the teeth of said follower member being disposed in said groove when said clutch is disengaged, said follower member being a spring disc, a second member connected to said follower member and having centrifugal clutch members connected thereto, a drum surrounding said second member and engageable by said centrifugal clutch member, and housing means for mounting a tool on said saw having means coaxial with said drum and adapted for being driven thereby.