Patent ID: 7758030

Claim:
A positioning apparatus, comprising: a plug member having a longitudinal axis projecting from a first block and adapted for insertion into a positioning hole formed in a second block and having a plurality of slide outer surfaces formed on an outer periphery thereof, a plurality of slide portions opposed to each other across the plug member in an opposed direction arranged around the plug member and having slide inner surfaces which together with said slide outer surfaces are formed into substantially vertical flat surfaces parallel to said longitudinal axis for movement relative to said slide outer surfaces in a first radial direction substantially orthogonal to the opposed direction thereof, a first pressing member diametrically expandably and diametrically contractibly and axially movably within a predetermined range arranged outside the slide portions, a second pressing member diametrically expandably and diametrically contractibly and axially movably within a predetermined range arranged outside the slide portions and inside the first pressing member, wherein the first pressing member is arranged to be driven toward the first block by a drive arrangement, such that the slide portions expand the first pressing member in said opposed direction which defines a second radial direction different from the first radial direction, and such that the slide portions are moved in the first radial direction with respect to the plug member.