CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National Stage entry of PCT Application No: PCT/JP2018/019194 filed May 17, 2018, which claims priority to PCT Application No. PCT/JP2017/018926, filed May 19, 2017, the contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure is directed to a slide fastener.

BACKGROUND ART

Patent literature 1 discloses a technology that provides a slide fastener with narrower width. Left and right fastener elements are coupled alternately along a movement direction of a slider. The length of each fastener element is less than a width, in the left-right direction, of the alternately coupled left and right fastener elements. The shape of each fastener element includes a bent or curved shape.

CITATION LIST

Patent Literature

[PLT 1] U.K. Patent Application Laid-open No. 442809

DESCRIPTION

SUMMARY

Technical Problem

In a conventional slide fastener shown inFIG. 9of the present application, when a slider is pulled for coupling the left and right fastener elements500, a head510of left fastener element500is required to enter into an interspace between heads510of right fastener elements arranged adjacently in the right fastener tape. Likewise, a head510of right fastener element500is required to enter into an interspace between heads510of left fastener elements arranged adjacently in the left fastener tape. Force required for this movement of slider causing engagements of fastener elements20may be hardly small for physically-weak people such as infant or aged people.

The present inventors have newly recognized a value of supplying a slide fastener which allows reduced force for moving a slider for coupling fastener elements.

Solution to Problem

A slide fastener according to some aspects of the present disclosure may be a slide fastener that includes: a pair of fastener stringers wherein each fastener stringer includes a fastener tape and a plurality of fastener elements attached to the fastener tape, each fastener element including a base portion secured to the fastener tape and a terminal portion positioned opposite to the base portion; and at least one slider for opening and closing the pair of fastener stringers, the slider including an upper wing, a lower wing, a coupling pillar and a flange, the coupling pillar coupling the upper wing and the lower wing, the coupling pillar being opposed to or touched by a terminal surface of the terminal portion of the fastener element, the flange being provided at least one of the upper wing and the lower wing, and the flange being opposed to or touched by a base end surface of the base portion of the fastener element, wherein the fastener element has an intermediate portion including bent or curved portion between the terminal portion and the base portion, the intermediate portion has an engaging protrusion and an engaged recess which are respectively protruded and recessed on an axis that matches a movement direction of the slider, and in an orthogonal direction orthogonal to the axis, a first distance between the axis and the terminal surface of the terminal portion is less than a second distance between the axis and the base end surface of the base portion.

A slide fastener according to some aspects of the present disclosure may be a slide fastener in which the paired fastener stringers are closed by frontward movement of a slider and are opened by rearward movement of the slider, the front-rear direction being identical to the movement direction of the slider along the axis, wherein the fastener element has a first recess that is recessed at an opposite side of the engaged recess and at a same side as the engaging protrusion, and wherein an interspace between a vertex position of the engaging protrusion and a bottom position of the first recess in the front-rear direction is substantially same as an interspace between a rearmost point of the terminal portion and a bottom position of the engaged recess in the front-rear direction.

A slide fastener according to some aspects of the present disclosure may be a slide fastener that includes: a pair of left and right fastener stringers wherein each fastener stringer includes a fastener tape and a plurality of fastener elements attached to the fastener tape, each fastener element including a base portion secured to the fastener tape and a terminal portion positioned opposite to the base portion; and at least one slider that moves frontward to close the pair of left and right fastener stringers and moves rearward to open the pair of left and right fastener stringers, wherein each of the left and right fastener elements is bent or curved so as to have an engaging protrusion at a front side of the fastener element and an engaged recess at a rear side of the fastener element, the fastener element at one side of the left and right sides is provided with a first recess between the engaging protrusion and the base portion, the first recess being configured to receive a first protuberance that is protruded rearward and is provided on the fastener element at the other side of the left and right sides, and in the respective left and right fastener elements, the engaging protrusion is provided at a position shifted closer to the base portion than the first protuberance in a left-right direction, and the first recess is positioned at a position shifter closer to the base portion than the engaged recess in the left-right direction.

A slide fastener according to some aspects of the present disclosure may be a slide fastener that includes: a pair of left and right fastener stringers wherein each fastener stringer includes a fastener tape and a plurality of fastener elements attached to the fastener tape, each fastener element including a base portion secured to the fastener tape and a terminal portion positioned opposite to the base portion; and at least one slider for opening and closing the pair of left and right fastener stringers, wherein each of the fastener elements at the left and right sides has an intermediate portion including bent or curved portion between the terminal portion and the base portion, the intermediate portion has an engaging protrusion and an engaged recess which are respectively protruded and recessed on an axis that matches a movement direction of the slider, and the fastener element at one side of the left and right sides has at least one displacement-restricting portion that prevents displacement, along an up-down direction, of the fastener element at the other side of the left and right sides.

Advantageous Effects of Invention

According to an aspect of the present disclosure, a slide fastener may be provided which allows reduced force for moving a slider for coupling fastener elements.

