| 摘要 |
PROBLEM TO BE SOLVED: To use a sample where the surface is in a projection-type cylindrical surface with that where the surface is in a projection-type spherical surface by equally providing four nearly spherical projection parts in contact with the sample at an equal-distance position apart from a hole around the hole of a side facing to the sample. SOLUTION: For example, when the hardness of a sample 35 where the surface is in a projection-type cylindrical curved surface is to be measured, a support ring 1 is placed so that the higher part of the sample 35 is positioned between projection parts 3a and 3b and between projection parts 3c and 3d. At this time, the curved surfaces of the projection parts 3a, 3b, 3c, and 3d are brought into contact with the curved surface of the sample 35, and the support ring 1 is supported. In the support ring 1 being installed in this manner, through a hole 2 of the support ring 1, a repulsion type hardness tester is installed so that the collision body of the repulsion type hardness tester can collide with the sample 35, and measurement is made. The curved surface of the projection part is continuously brought into contact with the sample, thus bringing the projection part into contact with the sample even when the contact surface of the sample is at any angle.
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