Patent ID: 7854187

Claim:
A rotary worktable positioning structure used in a miter saw, comprising: a machine base, said machine base having a plurality of locating holes spaced around the periphery thereof; a worktable rotatably supported on said machine base, said worktable comprising a forwardly protruding mounting frame, a first pivot pin, a second pivot pin and a third pivot pin, said first pivot pin and said second pivot pin and said third pivot pin being respectively inserted through said mounting frame; a handle pivotally coupled to said first pivot pin and turnable relative to said worktable between a lowered position and a lifted position; a follower member pivotally coupled to said second pivot pin and suspending below said handle, said follower member having an actuation portion and a working portion respectively disposed at two distal ends thereof, said actuation portion being moved by said handle to force said working portion against the periphery of said machine base when said handle is moved from said lifted position to said lowered position; a switch wheel pivotally coupled to said first pivot pin and turnable relative to said worktable between an inward position and an outward position, said switch wheel having a driving portion; a link pivotally coupled to said third pivot pin, said link having a driven portion at one end thereof and a dragging portion at an opposite end thereof, said driven portion being forced to work on said dragging portion and to cause turning of said link about said third pivot pin when said switch wheel is rotated; and a lock pin movable forwards and backwards in a straight direction, said lock pin having a rear end coupled to the dragging portion of said link and a front end terminating in an engagement portion, which is engaged into one said locating hole of said machine base when said switch wheel is in said inward position.