Slider and fastener

Abstract

A slider includes a lower blade, an upper blade, a guide pillar, and a pair of flanges. The flanges are respectively disposed on lateral edges of one of the lower blade and the upper blade, and the inner surface of another one of the lower blade and the upper blade and the end surface of the flanges are opposite to each other and separated by a gap. A first groove is provided on a side surface of the guide pillar and corresponds to the gap. A fastener includes a pair of fastener stringers and the slider. The fastener stringers include a fastener tape and an element column coil. A boundary between the first groove and the side surface of the guide pillar forms a step portion, and the step portion is located between the fastener tape and the element column coil.

What is claimed is: 
     
         1 . A slider, adapted to be installed on a pair of fastener stringers to form a fastener, and comprising:
 a lower blade;   an upper blade; oppositely disposed above the lower blade;   a guide pillar, disposed between the lower blade and the upper blade, and connecting a front end portion of the lower blade and a front end portion of the upper blade in a front-rear direction; and   a pair of flanges, respectively disposed on two opposite lateral edges of one of the lower blade and the upper blade on a width direction and extending toward another one of the lower blade and the upper blade, wherein   an inner surface of the another one of the lower blade and the upper blade and an end surface of the flanges are opposite to each other and separated by a gap,   a first groove is provided on a side surface of the guide pillar, and   the first groove corresponds to the gap in an up-down direction.   
     
     
         2 . The slider according to  claim 1 , further comprising:
 a tab pull installing lug, disposed above the upper blade,   the first groove being disposed at an end of the guide pillar close to the tab pull installing lug.   
     
     
         3 . The slider according to  claim 1 , wherein,
 the first groove is disposed on two opposite side surfaces of the guide pillar in the width direction.   
     
     
         4 . The slider according to  claim 1 , wherein,
 the first groove is disposed on a rear side surface of the guide pillar in the front-rear direction.   
     
     
         5 . The slider according to  claim 1 , wherein,
 an inner surface of the upper blade facing the lower blade is provided with a second groove, and   the second groove is located at a position on the inner surface of the upper blade close to the guide pillar.   
     
     
         6 . The slider according to  claim 1 , wherein,
 a front end edge of the front end portion of the lower blade is further rearward than a front end edge of the front end portion of the upper blade in the front-rear direction,   the guide pillar connects the front end edge of the lower blade and the front end portion of the upper blade, and is separated from the front end edge of the upper blade by a distance, and   a retreat portion is formed between a front end side of the guide pillar and the front end edge of the upper blade.   
     
     
         7 . The slider according to  claim 1 , wherein,
 the lower blade has a front end edge located at the front end portion, and a pair of shoulder opening lateral edges respectively extending rearward from the front end edge on opposite sides in the width direction, wherein   the front end edge is configured as an arc shape that protrudes outward, and   the shoulder opening lateral edges are configured as inwardly concave arc shapes, while avoidance portions are formed on opposite sides of the lower blade in the width direction.   
     
     
         8 . The slider according to  claim 1 , wherein,
 the upper blade has a front end edge located at the front end portion, and a pair of shoulder opening lateral edges respectively extending rearward from the front end edge on opposite sides in the width direction, wherein   the front end edge is configured as an arc shape that protrudes outward, and   the shoulder opening lateral edges are configured as arc shapes that protrude outward.   
     
     
         9 . The slider according to  claim 1 , wherein,
 the upper blade has a front end edge located at the front end portion, a pair of shoulder opening lateral edges respectively extending rearward from the front end edge on opposite sides in the width direction, and a rear opening lateral edge that is further rearward than the shoulder opening lateral edges in the front-to-back direction, wherein   the front end edge and the rear opening lateral edge are each configured in a linear shape extending in the width direction, and   the pair of the shoulder mouth lateral edges are configured in a linear shape extending in the front-rear direction.   
     
     
         10 . A fastener, comprising:
 a pair of fastener stringers; and   the slider according to  claim 1 , installed on the pair of fastener stringers to open or close the pair of fastener stringers, wherein   the pair of fastener stringers comprise a fastener tape and an element column coil installed on a first surface of the fastener tape,   a boundary between the first groove and a side surface of the guide pillar forms a step portion, and   the step portion is located between a second surface of the fastener tape opposite to the first surface and an end surface of the element column coil opposite to the fastener tape.