Fastener element of slide fastener has an intermediate portion including bent or curved portion between a terminal portion and a 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. 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.

An element includes a head having an engaging convex portion protruding from one surface thereof and an engaging concave portion formed on the back of the engaging convex portion on the other surface; and a pair of leg portions extending from the head. A protrusion is formed on a side of the engaging concave portion close to the leg portions to protrude inward of the engaging concave portion.

An element includes a head having an engaging convex portion protruding from one surface thereof and an engaging concave portion formed on the back of the engaging convex portion on the other surface; and a pair of leg portions extending from the head. A protrusion is formed on a side of the engaging concave portion close to the leg portions to protrude inward of the engaging concave portion.

The present disclosure discloses machining equipment for double-point zipper teeth includes a main driving mechanism, a cutter, a punch pin which is in transmission connection with the main driving mechanism and is capable of moving in an up-down direction, a main sliding seat which is in transmission connection with the main driving mechanism and is capable of moving in a front-back direction, and a machining module fixed at a front end of the main sliding seat. The present disclosure has a simple and reasonable structure and high machining efficiency, and saves materials and production time.

The present disclosure discloses machining equipment for double-point zipper teeth includes a main driving mechanism, a cutter, a punch pin which is in transmission connection with the main driving mechanism and is capable of moving in an up-down direction, a main sliding seat which is in transmission connection with the main driving mechanism and is capable of moving in a front-back direction, and a machining module fixed at a front end of the main sliding seat. The present disclosure has a simple and reasonable structure and high machining efficiency, and saves materials and production time.

A slide fastener chain includes first and second rows of coupling elements mounted on first and second longitudinal edges of the first and second fastener tapes. When the first and second rows of coupling elements are interdigitated, the first and second longitudinal edges remain spaced apart, and a first coupling element of the first row is received between two adjacent coupling elements of the second row such that: the groove of the first coupling element receives, in a first contact region, a portion of the second longitudinal edge, one of the grooves of the adjacent coupling elements receives, in a fourth contact region, a first portion of the first longitudinal edge, and another of the grooves of the adjacent coupling elements receives, in a fifth contact region, a second portion of the first longitudinal edge.

The present invention describes a zip comprising a pair of webbings (29; 38), each of which has in its side edges sequences of coupling elements or teeth (5; 12) facing with respect to their sector of joining with the webbing, each of these coupling elements (5; 12), being able to pivot around its central vertical axis thanks to a support placed between the coupling element (5; 12) and the webbing (29; 38), wherein the coupling element (5; 12) engages with the support and the latter with the webbing (29; 38), characterised in that said support consists of a cylinder (30) or of two half-cylinders (18, 19) placed in a specular manner at the opposite sides of the webbing (29).

The present invention describes a zip comprising a pair of webbings (29; 38), each of which has in its side edges sequences of coupling elements or teeth (5; 12) facing with respect to their sector of joining with the webbing, each of these coupling elements (5; 12), being able to pivot around its central vertical axis thanks to a support placed between the coupling element (5; 12) and the webbing (29; 38), wherein the coupling element (5; 12) engages with the support and the latter with the webbing (29; 38), characterised in that said support consists of a cylinder (30) or of two half-cylinders (18, 19) placed in a specular manner at the opposite sides of the webbing (29).

Provided is an aluminum alloy fastening member including a chemical conversion coating having a novel composition as a colored coating, and a method for producing the aluminum alloy fastening member. The aluminum alloy fastening member includes a chemical conversion coating containing tellurium as a component element.

Provided is an aluminum alloy fastening member including a chemical conversion coating having a novel composition as a colored coating, and a method for producing the aluminum alloy fastening member. The aluminum alloy fastening member includes a chemical conversion coating containing tellurium as a component element.