| 摘要 |
PROBLEM TO BE SOLVED: To provide a cap which blocks a counter boring part of a mounting hole arranged in a guide rail, and which can maintain fixing force with respect to the counter boring part over a long period of time.SOLUTION: The cap 5 is composed of a body 51 and an O ring 52. The body 51 is composed by integrally forming a short cylindrical part 511 and a plurality of projections 512. The short cylindrical part 511 is composed of a large diameter section 511a and small diameter section 511b. The plurality of projections 512 are arranged at a same interval along a peripheral surface of the large diameter section 511a. These projections 512 make the large diameter section 511a of the short cylindrical part 511 have an interference with respect to the conter boring part. The cap 5 is embedded in the counter boring part while the O ring 52 is attached to a stepped section 511c of the body 51, and in this regard, the O ring 52 is deformed elastically and then fixed to the counter boring part, and projections 512 also are chipped or elastically deformed and fixed to the counter boring part. |
