Patent ID: 7014548

Claim:
A pneumatic grinder with easily replacing grinding disc, comprising: a main body, a drive shaft is disposed in the main body; a top end of a rotary shaft being eccentrically pivotally connected with the drive shaft and being driven by the drive shaft, whereby the rotary shaft revolving in a circular track, a bottom end of the rotary shaft being for mounting a grinding disc; a rotary member fixedly connected with the bottom end of the rotary shaft and synchronously rotatable with the rotary shaft; the rotary shaft and the rotary member may stop in any position of the circular track; and an engaging mechanism movably mounted in the main body, when the engaging mechanism is moved to an engaging position, the engaging mechanism clogging the rotary member wherever the rotary shaft positioned in the track, when the engaging mechanism is moved to a releasing position, the engaging mechanism releasing the rotary member.