Female fastener and resin ring spring for female fastener

Abstract

A female fastener that holds a resin ring spring accommodated in an accommodation housing of the female fastener, wherein the resin ring spring accommodated in the accommodation housing locks a male fastener inserted therein. The resin ring spring includes a plurality of outwardly projecting convex portions provided at a predetermined interval, in such a manner that, when the resin ring spring is in a natural state accommodated in the accommodation housing, a diametrical gap between an inner circumferential wall of the accommodation housing and an outer circumference of the ring spring increases and decreases alternately. A difference between an outer diameter of the resin ring spring and an inner diameter of the accommodation housing is 0.2 mm or less.

What is claimed is: 
     
         1 . A female fastener that holds a resin ring spring accommodated in an accommodation housing of the female fastener, wherein
 the resin ring spring accommodated in the accommodation housing locks a male fastener inserted therein,   the resin ring spring comprises a plurality of outwardly projecting convex portions provided at a predetermined interval, in such a manner that, when the resin ring spring is in a natural state accommodated in the accommodation housing, a diametrical gap between an inner circumferential wall of the accommodation housing and an outer circumference of the ring spring increases and decreases alternately, and   a difference between an outer diameter of the resin ring spring and an inner diameter of the accommodation housing is 0.2 mm or less.   
     
     
         2 . The female fastener according to  claim 1 , wherein
 a clearance value is defined as one half of “a value obtained by subtracting ‘a thickness of a material for the accommodation housing×2’ and ‘the outer diameter of the resin ring spring’ from an outer diameter of the accommodation housing”, and   the clearance value is 0.1 mm or less.   
     
     
         3 . The female fastener according to  claim 2 , wherein
 the clearance value is 0.05 mm or less.   
     
     
         4 . The female fastener according to  claim 1 , wherein
 the resin ring spring comprises one or more multibridge portions that protrude(s) in an up-down direction that is vertical to a flat ring surface.   
     
     
         5 . The female fastener according to  claim 4 , wherein
 the resin ring spring has a continuous star-shaped polygonal shape, as viewed in plan view.   
     
     
         6 . A resin ring spring that locks a male fastener inserted therein while the resin ring spring is accommodated in an accommodation housing of a female fastener,
 the resin ring spring comprising:   a plurality of outwardly projecting convex portions provided at a predetermined interval, in such a manner that, when the resin ring spring is in a natural state accommodated in the accommodation housing, a diametrical gap between an inner circumferential wall of the accommodation housing and an outer circumference of the ring spring increases and decreases alternately, and   one or more multibridge portions that protrude(s) in an up-down direction that is vertical to a flat ring surface.   
     
     
         7 . The resin ring spring according to  claim 6 , wherein
 the resin ring spring has a continuous star-shaped polygonal shape, as viewed in plan view.