Patent ID: 8063980

Claim:
An accessory comprising: a cylindrical member to be connected to a device, and a retaining ring mounted on the outer circumference of the cylindrical member the retaining ring including an elastically deformable annular part mounted on the outer circumference, and retaining ridges disposed on parts of the annular part, respectively, so as to protrude radially outward from the outer circumference; wherein the retaining ridges move radially inward of the annular part together with the parts of the annular part when the parts, where the retaining ridges are disposed, of the annular part are depressed radially inward of the annular part, wherein an annular groove is formed in the outer circumference of the cylindrical member, the annular part has an inside diameter greater than the outside diameter of a bottom surface of the annular groove, and is engaged in the annular groove, and the retaining ridges sink radially inward from the outer circumference when the parts, where the retaining ridges are disposed, of the annular part are depressed radially inward of the annular part.