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|1. (WO2013118914) INSIDE-DIAMETER MEASUREMENT DEVICE|
|Title:||INSIDE-DIAMETER MEASUREMENT DEVICE|
This inside-diameter measurement device has the following: a measurement-subject mount (3) that holds a hollow tube (13) being measured and is provided so as to be able to move along a rail (2) laid along the top surface of a bed (1); a support shaft (18) that extends from the base end of said bed towards the front end thereof, can be inserted inside the tube being measured, and is supported in a cantilevered fashion; and an inside-diameter measurement unit (19) that is provided at the tip of the support shaft, can be inserted inside the tube being measured, and measures the inside surface of said tube when inserted therein. The tube being measured and the inside-diameter measurement unit lie on the same reference line. The measurement-subject mount can move from a point at which the inside-diameter measurement unit is outside the tube being measured to the point at which the inside-diameter measurement unit reaches the base of the tube being measured. The inside diameter of the tube being measured is measured during the process of inserting the inside-diameter measurement unit into the tube being measured and moving the measurement-subject mount towards the base end of the support shaft.