Patent ID: 8757920
Filing Date: 2014-06-24
Classification: B23Q,F16B,Y10T

Abstract:
1. A positioning apparatus for positioning an object in respective axis directions of an X-axis, a Y-axis perpendicular to the X-axis, and a Z-axis orthogonal to the X-axis and the Y-axis and positioning the object around the Z-axis within a plane parallel to the X-axis and the Y-axis, the positioning apparatus comprising: a retainer; and a fastener being configured to detachably fasten the retainer, wherein the retainer includes: wherein the fixing shaft is formed integrally with the fixing part and has a tapered pyramid part which decreases in size at a constant angle toward a free end thereof and which is formed coaxially with the fixing shaft, wherein each of intersection angles between adjacent sides of the pyramid part is the same and each of two ends between the adjacent sides is connected by a curve being outwardly convexed from the axis of the fixing shaft in a cross-sectional view perpendicular to the axis of the fixing shaft, wherein the fastener includes: wherein the fixing shaft or the fixing hole is configured such that a gap is formed between the first reference surface and the second reference surface when the fixing shaft is inserted into the fixing hole, the outer surface of the pyramid part fits to the inner surface of the fixing hole and the object is positioned in the X-axis direction and the Y-axis direction, and is configured such that the first reference surface and the second reference surface come into contact with each other when the fastening part pulls the fixing shaft toward the second fastener surface of the body part, the pyramid part or the fixing hole elastically deforms, and the fixing shaft is further pulled into the fixing hole with maintaining the fitting between the outer surface of the pyramid part and the inner surface of the fixing hole, wherein the pyramid part is formed with a hole in the cross-sectional view perpendicular to the axis of the fixing shaft, to form a plurality of elastic wall portions on respective sides of the pyramid part between the outer surface of the pyramid part and the through hole, and wherein the respective sides of the pyramid part are formed at center portions thereof with recesses which are smoothly recessed by a predetermined depth with respect to straight portions formed at both sides of the center portions of the respective sides in the cross-sectional view perpendicular to the axis of the fixing shaft, to form a plurality of thin-walled portions at the respective elastic wall portions; wherein the fastening part comprises: