| 摘要 |
A hand-held, motor-driven cutting device, in particular, of the type in which the cutting member of the device (eg. cutter blades, chain) will rapidly come to a stand-still when decoupled from the drive of the motor. The device comprises; means (6) for providing rotary driving power input at a first rotatable shaft (20); speed reduction means for receiving the power input from the first shaft and delivering a relatively low speed rotary power output (40) and drive means (66,120) for utilising the rotary power output of the speed reduction means to drive a cutting member (14, 16,116). The speed reduction means is contained within a ring gear element (32) coaxial with the first shaft (20) and is adapted to deliver the relatively low speed rotary power output (40) when the ring gear is restrained from rotation. The device further comprises restraining means (44,48) for restraining the ring gear (32) from rotation, which restraining means is selectively engageable.
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