| 摘要 |
PROBLEM TO BE SOLVED: To market an internal diameter measuring instrument capable of simply and exactly measuring internal diameters of various deformation components. SOLUTION: The internal diameter measuring instrument comprises an outer cylinder with a graduation, and an inner cylinder with a reference graduation, sliding in the outer cylinder; wherein a small disc with a duplex configuration is mounted at the distal end of the outer cylinder in the direction perpendicular to the distal end, and a plurality of probes is mounted at the distal end of the inner cylinder that are guided within the small disc of the duplex configuration and accessible toward the radial outside. In this case the probes are 3 to 12 pieces, and the outer cylinder is formed with a transparent material and the reference graduation of the inner cylinder can be seen through. COPYRIGHT: (C)2006,JPO&NCIPI
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