| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a nut covering device to put a nut member for various purpose out of possibility of being rotated while it covers the nut member and also provide a bolthead covering device which puts the bolthead of a bolt for various purposes out of possibility of being rotated while it covers the bolthead. SOLUTION: The nut covering device 5 is composed of a cover assembly 20 including a first restricting mechanism 6, a second restricting mechanism 7, and a third restricting mechanism 8. The first restricting mechanism 6 restricts the outer cover 40 of the cover assembly 20 so that it 40 does not make relative movement with the inner cover 30 in the axial direction, while the second restricting mechanism 7 restricts the inner cover 30 so that it 30 does not make relative movement with the nut 10 in the axial direction, and the third restricting mechanism 8 restricts the outer cover 40 so that it 40 does not make relative movement with the nut 10 in the axial direction, at least in the removing direction thereof. The restrictions by the second 7 and third mechanisms 8 are released in the condition that the phases in the circumferential direction of the inner cover 30 and outer cover 40 relative to the nut 10 are put identical to the specific phase preset, and then the cover assembly 20 is mounted to and removed from the nut 10.</p> |
