Rotary worktable positioning structure for miter saw
AssigneeDurq Machinery Corp.
InventorsChia-Sheng Liu, Yi-Li Cheng
Life of this patent
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Abstract
A rotary worktable positioning structure used in a miter saw is disclosed to include a first positioning unit controllable by biasing a handle to lock the worktable to the machine base or to unlock the worktable for free rotation, and a second positioning unit controllable by rotating a switching wheel to move a lock pin into one of a number of locating holes on the periphery of the machine base and to further lock the worktable in one of a number of predetermined cutting angles.
Claims13
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.
A rotary worktable positioning structure used in a miter saw, said miter saw comprising a machine base and a worktable rotatably supported on said machine base, said rotary worktable positioning structure comprising:
- a first positioning unit, said first positioning unit comprising a handle and a locating block, said handle being pivotally connected to a front side of said worktable with a first pivot pin and turnable relative to said worktable between a lowered position and a lifted position, said locating block being stopped against the periphery of said machine base when said handle is in said lowered position, said locating block being kept apart from the periphery of said machine base when said handle is in said lifted position;
- and
- a second positioning unit, said second positioning unit comprising a switch wheel, a lock pin, and a plurality of locating holes formed on and spaced around the periphery of said machine base, said switch wheel coupled to said first pivot pin and turnable about said first pivot pin between an inward position and an outward position, said lock pin being engaged into one said locating hole when said switch wheel is in said inward position, said lock ping being kept apart from said locating holes when said switch wheel is said outward position.
Dependencies are inferred from the claim text.