Patent ID: 8448931

Claim:
A work pallet positioning and fixing device that positions and fixes a work pallet above a base member in the horizontal direction and in the vertical direction; wherein said base member comprises a first reference member for positioning in the horizontal direction, a second reference member disposed at a position distant from the first reference member and for restricting rotation in a horizontal plane around the first reference member as a center, and a reference seating surface for positioning in the vertical direction; each of said first and second reference members comprises a flange portion, a protruding engagement portion that projects upwards from a central portion of the flange portion, and a plurality of vertical fitting bolts and a plurality of fitting bolt holes that fix the flange portion to the base member; a bolt head accommodation hole of each of said fitting bolt holes being formed in a state of partially overlapping with said protruding engagement portion as seen in plan view, and a plurality of tapered engagement surfaces that reduce in diameter upwards are formed on an outer periphery of the protruding engagement portion between the bolt head accommodation holes; said work pallet comprises a plurality of annular engagement members, comprising respectively annular engagement portions capable of being deformed elastically in the direction to increase their external diameter, and capable of engaging with the plurality of tapered engagement surfaces of the first and the second reference members in a closely engaged state; and there is provided with a constitution that by mounting the work pallet on the reference seating surface of said base member, and by screwing a plurality of clamp bolts passed through a plurality of bolt passing holes formed in said work pallet into a plurality of bolt holes on the side of said base member and thereby pressing the work pallet to said reference seating surface, the work pallet is positioned and fixed via elastic deformation of said annular engagement portions.