| 摘要 |
Handling ability can be improved and operational defect at a time of integral formation with a rubber like elastic seal lip can be prevented by effecting a chamfering working to an edge portion of a conical washer like resin ring. In a method in which a conical washer like resin ring 40 is formed by conically cutting away an end surface 51 of a cylindrically formed resin material 50 with a predetermined thickness and the resin ring is utilized as a seal lip 3 by assembling the inner diameter end portion or outer diameter end portion with a device body, it is characterized in that a sharply projecting edge portion 47 on the side utilizing as the seal lip of the conical washer like resin ring 40 is subjected to chamfering working 45, 46. It is characterized in that the resin ring 40 is assembled with the device body having a rubber like elastic seal lip 2.
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