| 摘要 |
The thick-walled cylindrical portion 12 of a holder 10 is provided with axial grooves 18 that open to the inner peripheral surface. In the axial grooves 18, slip-off preventive projections 20 are radially inwardly elastically urged by their own elasticity. The substantially disk-like antislip portion 54 of an antislip body 50 is centrally formed with a cylindrical antislip body-associated fitting portion 56 projecting downward therefrom. The antislip body-associated fitting portion 56 is formed with a circumferential annular slip-off preventive groove 58 disposed somewhat above the lower end thereof. The antislip portion 54 is formed with antislip body-associated insert receiving portions 60 extending therethrough and disposed at positions corresponding to the slip-off preventive projections 20. Once the antislip body-associated fitting portion is fully to the holder-associated fitting portion, the antislip body can be easily and reliably held in the holder without using any tools. Furthermore, the antislip body can be easily and reliably removed from the holder by fully inserting fit-canceling inserts in the insert receiving portions.
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