Patent ID: 6926095

Claim:
In a power tool transmission device including a base, a switch portion, a vibration member, a press portion, a transmission shaft and a casing, wherein a driving force is transmitted via the base to drive a free end of the transmission shaft to drive an auxiliary tool mountable on the free end of the transmission shaft, the improvement wherein: the switch portion includes a sleeve securely mounted on a switch seat and including projections formed on a bottom of the sleeve to control position plates slidably mounted in the switch seat; the vibration member includes a position wheel and a driving wheel, the position wheel is securely mounted on the transmission shaft and includes a first ratchet gear disposed on a top face of the position wheel and an outer ring being disposed on a bottom face of the position wheel, wherein rotation of the outer ring is alternatively limited by positions of the position plates, and the driving wheel includes a second ratchet gear formed to correspond to and alternatively mated with the first ratchet gear, wherein when the projections press the position plates, bosses on the position plates engage ribs formed on an outside of the outer ring so as to limit the rotation of the outer ring and when the first ratchet gear and the second ratchet gear are intermittently disengaged with each other, and a vibration effect is provided to the transmission shaft.