Patent ID: 9518817
Filing Date: 2016-12-13
CPC Classification: G01B,H04N

Claim Text:
1. An inner diameter measuring device, comprising an object to be measured supporting carriage, being arranged movably along a rail installed on an upper surface of a bed and used for holding a hollow pipe to be measured, a supporting shaft extended from a base end to a forward end of said bed, being insertable into said pipe to be measured and being cantilever-supported, and an inner diameter measuring unit installed on a forward end of said supporting shaft, being insertable into said pipe to be measured and for measuring the inner surface of said pipe to be measured under inserted condition, wherein said pipe to be measured and said inner diameter measuring unit are installed along a same reference line, said object to be measured supporting carriage is movable from a condition where said inner diameter measuring unit is withdrawn from said pipe to be measured to a condition where said inner measuring unit reaches a base part of said pipe to be measured, said inner diameter measuring unit is adapted to be inserted into said pipe to be measured, and is adapted to measure an inner diameter of said pipe to be measured in a process where said object to be measured supporting carriage is moved toward the base end of said supporting shaft.