| 摘要 |
PROBLEM TO BE SOLVED: To prevent an oil filler cap from being tightened more firmly than required, and to allow a mechanism thereof to be smoothly operated for a long time. SOLUTION: A plurality of projections 13, 13, etc., are formed on an outer circumferential wall of a first auxiliary rotating tool 10, a plurality of fitting parts 15, 15, etc., for fitting the projections 13, 13, etc., and guiding the movement in the transverse direction are formed on an inner circumferential wall, and a plurality of contact parts 16, 16, etc., brought into contact by the movement of the projections 13, 13, etc., are formed on an inner circumferential wall of a second auxiliary rotating tool 14 formed of the same material as the first auxiliary rotating tool 10. When the rotational force larger than the required value is applied while fitting the oil filler cap 3 to an oil feed port 2, a slip is generated between the projections 13, 13, etc., and the contact parts 16, 16, etc., to interrupt the drive of an elevating/lowering guide cylinder 7, and a warning sound for indicating the excessive tightening is given. |
