Patent ID: 7819392

Claim:
A positioning and clamping device, comprising: a clamping mechanism that pulls down and clamps a clamping object for fitting a work piece to be machined or a metal mold, to a base member; a protruding cylindrical shaft provided on the base member an annular engagement member provided on the clamping object so as to be capable of being fitted on the cylindrical shaft; a positioning mechanism that positions the clamping object in the horizontal and vertical directions in relation to the base member, said positioning mechanism comprising an annular tapered surface that is formed on an outer periphery of the cylindrical shaft for positioning the clamping object in the horizontal direction, and that has a decreasing diameter toward an axial tip of the cylindrical shaft, and an annular engaging mechanism that is formed on an inner periphery side portion of the annular engagement member, so as to be capable of engaging with the annular tapered surface and of elastically deforming in the radial direction, in an engaged state with the annular tapered surface, said engaging mechanism including a tapered ring portion capable of making a face contact with the annular tapered surface, and multiple ribs being circumferentially spaced apart and extending radially outward from the tapered ring portion.