Abstract: The instant disclosure relates to a zipper head. The zipper head includes a main structure, a flexible member, a securing member, a pull tab, a guiding member, and a shaft. The main structure has a first fixing portion and receives the flexible member. The securing member has a second fixing portion corresponding to the first fixing portion. The securing member contacts with the flexible member. The guiding member is pivotally connected to one end of the main structure and contacts with the securing member. A receiving space is cooperatively defined by the main structure, the securing member, and the guiding member. A fixing end of the pull tab is disposed in the receiving space. The shaft penetrates the main structure and is pivotally connected to the securing member. The instant disclosure also discusses a method for replacing the pull tab of the zipper head.

Abstract: A slider for a double-sided slide fastener includes: a body, having a first body, a second body opposed to the first body, an operating member, having a first member parallel to the first body and formed with a first groove and a second member parallel to the second body and formed with a second groove, and adapted to slide on the first and second bodies in a direction; a pawl member having a locking pawl configured to retractably project to a space of the body in accordance with a sliding operation of the operating member; and first and second pull-tabs, attached to the first and second grooves, respectively. A shaft portion of the first pull-tab can abut against an end portion of the first groove in the direction, and a shaft portion of the second pull-tab can abut against an end portion of the second groove in the direction.

Abstract: A slider for zip fasteners with two tabs, includes a hollow body in which are positioned members designed in such a way that, when either one of the two tabs is pulled, this causes the disengagement of a pawl from the teeth of a fastener, overcoming the resistance of elastic elements which keep the pawl inserted between the teeth. In the slider, the members include a fork provided with two prongs positioned on opposite sides of the plane of the teeth and pivoted at a point of the slider in such a way that it can rotate in a plane perpendicular to the plane of the teeth when a force is exerted on at least one of its prongs by the tab connected to it by its ring.

Abstract: A slider (1) for zip fasteners with two tabs (2, 3), comprising a hollow body (4) in which are positioned structure (10, 5, 6) designed in such a way that, when either one of the two tabs (2, 3) is pulled, this causes the disengagement of a pawl (7) from the teeth (Zi) of a fastener, overcoming the resistance of elastic structure (8, 9) which keep the pawl inserted between the teeth (Zi). In the slider (1) a fork (10) is provided with two prongs (5, 6) positioned on opposite sides of the plane (?) of the teeth (Zi) and pivoted at a point (P, Q) of the slider (1) in such a way that it can rotate in a plane (?) perpendicular to the plane (?) of the teeth (Zi) when a force is exerted on at least one (6) of its prongs (5, 6) by the tab (3) connected to it by its ring (3a).

Abstract: A slider for slide fastener provided with an automatic stopper device which allows automatic assembly and manual assembly and holds a leaf spring in a stabilized condition, the slider having five members, that is, a body, a pull tag, a pawl member, a leaf spring and a cover. Mounting posts for attachment of the cover are provided on front and rear portions on a top face of the body. The top face of each of the mounting posts has a protrusion as a first holding portion for holding the leaf spring in which concave portions are formed in both ends. The cover to be mounted on the mounting posts has protrusions as second holding portions for holding the leaf spring at front and rear ends of the inner face of the top wall. Each of the concave portions in the leaf spring is engaged with the protrusions of the first holding portion and second holding portion with play.

Abstract: A zipper slide is constructed to include a slide, the slide having a front recessed hole, a rear through hole, and stop means in the front recessed hole, a hook plate, the hook plate having a front fulcrum positioned in the front recessed hole and a wedged rear hook for inserting into the rear through hole to engage the interlocking teeth of zipper tapes to which the slide is fastened, a elastic member adapted to force the hook plate into the front through hole, a pull-tab coupled to the hook plate, and a locating plate stamped into the front recessed hole to hold the elastic member and the hook plate in place, the locating plate having protruded portions engaged with the stop means of the slide.

Abstract: In an auto-lock slide fastener slider composed of four members, i.e., a slider body, a pull tab, a locking member and a cover, the slider body has front and rear resilient cover-attachment projections extending from an upper wing and terminating respectively in outwardly directed hooks while the cover is made of thermoplastic resin and has on respective inner edges of front and rear end walls corresponding inwardly directed hook portions resiliently engaged with the hooks of the cover-attachment projections. The cover can be attached to the slider body simply in a single snap action. Since all parts of the attaching mechanism are concealed by the cover, the resulting slider is neat in appearance.

Abstract: An automatic lock slider for slide fasteners comprises a slider body including an upper and a lower wing defining therebetween a guide channel for the passage of slide fastener elements, and a first and a second locking member associated with the upper and lower wings, respectively and rotatable in opposite directions into and out of engagement with each other through their respective link arms pivotally connected to the slider body, and a pair of pull tabs operatively associated with the locking members for manipulating the slider selectively from either of its sides.

Abstract: An automatic lock slider for slide fasteners comprises a slider body including an upper and a lower wing defining therebetween a guide channel for the passage of slide fastener coupling elements, a locking member for locking the slider against movement, a pull tab operatively associated with the locking member for manipulating the slider, a casing and a spring member interposed between the casing and the locking member and normally urging the latter in a direction to lock the slider. The casing has retaining lugs interiorly disposed for folding over the spring member to retain the latter in position stably but loosely to permit its resilient movement relative to the locking member.

Abstract: A variable ratio rack has a linear array of teeth. The teeth in the linear array are disposed at a plurality of final tooth angles. In order to form the rack, a linear array of teeth is cut in a workpiece. The teeth in the linear array of cut teeth have a tooth angle which is less than the largest tooth angle of the plurality of final tooth angles and greater than the smallest tooth angle of the plurality of final tooth angles. After the linear array of teeth has been cut in the workpiece, the cut teeth are deformed to have tooth angles corresponding to the final tooth angles.