| 摘要 |
PURPOSE: A twin ring binding structure is provided to combine-fix twin ring between a supporting protrusion as a hanger type and combine-fix the twin ring to a twin ring penetrating hole of the supporting protrusion as an insertion type. CONSTITUTION: A twin ring binding structure includes a band shaped support body, a plurality of cylindrical shape supporting protrusions(20). The band shaped support body is installed and arranged longitudinally to inner surface of center part of a cover(50). A plurality of cylindrical shape supporting protrusions is molded into one with the support body having interval corresponding to the thickness of twin ring binging a possession(60) along the longitudinal direction of the support body and is respectively inserted to twin ring binding possession and has a twin ring penetration hole to width direction of the support body. The interval(s) between the support protrusion is set to satisfy d<=s<=2d if one liner diameter of a spring is d. The support body is fixed on a cover by installing a support protrusion to be exposed into inside of the inner skin through inserting hole forming in the inner skin in state of the support body to located in between outer over and inner cover comprised in a plurality of layers by including the outer cover and inner cover. |
