Slider for concealed type slide fastener

Abstract

A slider for a concealed slide fastener has a pair of first flanges each having an inverted L-shaped section along a right or left side edge of a lower blade, and a diamond erected in a central portion the lower blade and having a substantially elliptic horizontal section. A wedge-like space between top plate portions of the pair of first flanges has a second flange having a rectangular plate portion and a wedge plate portion formed integrally on the top surface of the diamond, the second flange stretched outward along an outer periphery of the diamond. A height of the bottom surface of a shoulder mouth side end portion of the second flange is set higher than heights of the other areas, and a tapered surface is formed on a peripheral surface such that a taper angle is increased gradually as it goes toward a rear mouth side.

1 . A slider for a concealed type slide fastener for engaging or disengaging respective engaging elements of a pair of fastener stringers, each of the fastener stringers having a plurality of engaging elements attached along an outside surface of a folded end edge of each of side edge portions which are bent and fixed into a U shape such that they oppose each other, wherein the slider comprises:
 a lower blade having a pair of first flanges each having an inverted L-shaped section, which are erected along right and left side edge portions orthogonal to a sliding direction of the slider;   a diamond erected in a central portion at one end in a sliding direction of the lower blade; and   a second flange arranged between top plate portions of the pair of first flanges and having a rectangular plate portion formed integrally with a top surface of the diamond and a wedge plate portion extending from the rectangular plate portion in a sliding direction, the second flange being stretched outside along an outer periphery of the diamond,   wherein at least in an outside area of a diamond side of a portion of a peripheral surface of the second flange, the portion intersecting with a straight line passing a diamond side end face of each of the right and left top plate portions of the right and left first flanges, a tapered surface expanded upward from a bottom end thereof is formed, and   wherein a top end ridge line of the tapered surface is set lower than a top surface of each of the top plate portions of the first flanges and higher than a height between a top surface of the lower blade and a bottom surface of each of the top plate portions.   
   
   
       2 . The slider for the concealed type slide fastener according to  claim 1 , wherein the top end ridge portion of the tapered surface has a lowest height between the top end ridge portion of the second flange portion on a side of the wedge plate portion of the straight line and the top surface of the lower blade, and
 the top end ridge portion of the tapered surface up to an end face on an opposite side to the wedge plate portion of the straight line is set such that heights of the top end ridge portion with respect to the top surface of the lower blade increase gradually step-by-step.   
   
   
       3 . The slider for the concealed type slide fastener according to  claim 1 , wherein the tapered surface has taper angles which change in plural stages in a peripheral direction of the second flange, and a taper angle in a vicinity of the straight line the second flange is a largest angle while a taper angle from the straight line to an end portion of the diamond side is decreased gradually. 
   
   
       4 . The slider for the concealed type slide fastener according to  claim 1 , wherein top surfaces of the first flanges and a top surface of the second flange are on an identical plane, and at least a bottom surface of the second flange on a side of the wedge plate portion relative to the straight line is arranged below bottom surfaces of the first flanges. 
   
   
       5 . The slider of concealed type slide fastener, according to  claim 3 , wherein each of the taper angles of the plural stages is changed gradually step by step in a range of 0° to 90°. 
   
   
       6 . The slider for the concealed type slide fastener according to  claim 1 , wherein a Y-shaped tape guide passage is formed between each of the top plate portions ( 102   a ,  103   a ) of the first flanges and the second flange, and a bottom surface of an edge portion on an inside portion of each of the first flanges, which is sectioned into inside and outside portions by an extension line of a long side of the rectangular plate portion of the second flange, is formed more thinly than a bottom surface of the outside portion via a step portion. 
   
   
       7 . The slider for the concealed type slide fastener according to  claim 2 , wherein the tapered surface has taper angles which change in plural stages in a peripheral direction of the second flange, and a taper angle in a vicinity of the straight line the second flange is a largest angle while a taper angle from the straight line to an end portion of the diamond side is decreased gradually. 
   
   
       8 . The slider of concealed type slide fastener, according to  claim 7 , wherein each of the taper angles of the plural stages is changed gradually step by step in a range of 0° to 90°.