| 摘要 |
In a tension providing device having a rotary shaft which rotates the spring force in an inserted casing, a pushing body which slide in an axial direction by the aid of the rotation of the rotary shaft, a seal bolt screwed with the base end portion of the casing, and a boot which covers between casing and pushing body, the mixing of dust and foreign matters from outside and the leakage of the lubricant coated or filled in the inner portion are prevented due to the covering of the boot and seal with bolt.
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