MEASURING INSTRUMENT, COLLISION RETREAT MECHANISM USED FOR THE SAME, AND COLLISION RETREAT METHOD

摘要

To quickly retreat a measuring instrument from a place where an abnormal event occurs without damaging the measuring instrument even when the abnormal event such that the measuring device collides with a measurement object etc. occurs, and to make it possible to perform highly accurate measurement by accurately restoring the measuring instrument to an original position in the measurement after retreat.SOLUTION: A measuring unit 80 includes a sensor/probe unit 110 having a measuring unit having measuring elements 81a and 81b and a detecting unit disposed close to the measuring unit, and a collision retreat mechanism 200 attached to the sensor/probe unit 110 which is a portion extending in the axial direction of the sensor/probe unit 110. The collision retreat mechanism 200 has a nest structure having an inner tapered shaft 230 and an outer tapered shaft 250. Each of the inner tapered shaft 230 and the outer tapered shaft 250 has tapered locking portions 218 and 256 provided at a middle portion, and large diameter cylindrical parts 216, 258 and small diameter cylindrical parts 220, 254 provided on both axial end sides of the tapered locking portions 218 and 256.SELECTED DRAWING: Figure 2