Slide fastener slider and mold for die-casting the same

Metal founding – Means to shape metallic material – Including means to assemble mold parts

Reexamination Certificate

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Details

C164S312000, C425S545000, C425S577000, C425SDIG005

Reexamination Certificate

active

06227283

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a slide fastener slider manufactured by molding a cantilevered pull-tab attaching lug on a slider body by die-casting using metal, then threading an attachment ring of a pull tab onto the pull-tab attaching lug from its free end and finally plastically deforming the pull-tab attaching lug by pressing. The invention relates also to a mold for die-casting such slider.
2. Description of the Related Art
In slide fastener sliders of the described type, it has been a common practice to provide a cantilevered pull-tab attaching lug on a front end of an upper wing of the slider body so as to leave a gap between its rear or free end and the upper wing, then to thread the attachment ring of the pull tab onto the pull-tab attaching lug via the gap and finally to plastically deform the pull-tab attaching lug by pressing to reduce the size of the gap to prevent accidental removal of the attached pull tab.
Japanese Utility Model Publication No. Hei 2-12889 discloses a die-casting mold for slide fastener slider, comprising an upper die of lateral-split type for molding the upper half part of the upper wing and the cantilevered pull-tab attaching lug, a lower die of lateral-split type for molding the exteriors of lower half part of the lower wing, a first slide core disposed between the upper and lower dies and longitudinally slidable to enter the slider body from its front end for molding the front part of the guide post and the interiors of a guide channel and of guide flanges, and a second slide core engageable with the first slide core and longitudinally slidable to enter the slider body from its rear end for molding the rear part of the guide post and exteriors of the guide channel and of the guide flanges.
According to the above-mentioned conventional slider, when the pull-tab attaching lug is pressed on its top surface to plastically deform its base after the pull tab is mounted onto the pull-tab attaching lug, a great pressing force is required so that the base would tend to be cracked or otherwise damaged. Besides, the slider body inevitably has parting lines on the longitudinal, central portions of the slider, including the pull-tab attaching lug, making the overall appearance of the slider body unsightly.
According to the above-mentioned conventional die-casting mold, since the upper and lower dies for molding the slider body are parted laterally in opposite directions, parting lines would occur longitudinally and centrally on and along the slider body itself and the pull-tab attaching lug as well, making the overall appearance of the slider unsightly. Further, with this conventional mold, it is difficult to manufacture such a slider that the pull-tab attaching lug can be plastically deformed easily by pressing.
SUMMARY OF THE INVENTION
It is therefore a first object of the present invention to provide a slide fastener slider which is suitable to be molded by die-casting, in which a pull tab can easily be attached to a cantilevered pull-tab attaching lug standing on a slider body, and which is devoid of any parting line due to molding process oil surfaces centrally of the slider body including the pull-tab attaching lug to secure a tidy appearance.
A second object of the invention is to provide a slide fastener slider in which the pull-tab attaching lug can be plastically deformed with ease to facilitate attaching the pull tab to the pull-tab attaching lug and which is neat in appearance.
A third object of the invention is to provide a slide fastener slider in which an attachment ring of the pull tab can be threaded onto the pull-tab attaching lug smoothly from a free end of the pull-tab attaching lug and is prevented from being accidentally removed off the pull-tab attaching lug once it is mounted.
A fourth object of the invention is to provide a slide fastener slider in which the pull-tab attaching lug is good in balance and neat in appearance and can be threaded through the attachment ring of the pull tab smoothly.
A fifth object of the invention is to provide a slide fastener slider in which parting lines due to die-casting are concealed and a slider body is finished in a unique design.
A sixth object of the invention is to provide a slide fastener slider in which the pull tab can be attached to the pull-tab attaching lug of the slider body in a simple manner using simple means to complete the assembling of the slider.
A seventh object of the invention is to provide a mold for die-casting a slide fastener slider which mold can die-cast a slide body without making any apparent parting line on its surfaces and which mold is suitable for molding a slider such that a pull-tab attaching lug can be plastically deformed easily using simple means, facilitating attaching a pull tab to the pull-tab attaching lug and preventing the attached pull tab from being accidentally removed off the lug.
An eighth object of the invention is to provide a mold for die-casting the slide fastener slider, which mold includes slide cores capable of molding the slider body simply without any parting line on the surfaces of the pull-tab attaching lug.
A ninth object of the invention is to provide a mold for die-casting the slide fastener slider which mold includes slide cores capable of molding the slider body such that an attachment ring of the pull tab can be threaded onto the pull-tab attaching lug with ease.
A tenth object of the invention is to provide a mold for die-casting the slide fastener slider which mold can mold the slider body easily in a unique design, enabling to conceal parting line on an upper surface of a slider body.
In order to accomplish the above first object, according to a first aspect of the present invention, a slide fastener slider comprises: a die-cast slider body composed of upper and lower wings connected at their front ends by a guide post; a cantilevered i.e. inverted L-shaped pull-tab attaching lug projecting from an upper surface of the guide post toward an rear end of the slider body on the upper wing with a gap being formed by an opening at the rear end side of the pull-tab attaching lug, the pull-tab attaching lug having a hollow extending longitudinally through its base and an end projection extending from an end i.e. at the lower surface on the rear end side of the pull-tab attaching lug toward and terminating short of an upper surface of the upper wing, the downwardly projecting end projection having a width substantially equal to a width of the hollow and being spaced a gap from the upper wing so that a pull tab having a attachment ring can be threaded on the pull-tab attaching lug.
According to a second aspect of the invention, the above second object is accomplished by that the hollow extending through the base of the pull-tab attaching lug has a right-angled hexahedral contour and has a pair of vertical flat side walls.
According to a third aspect of the invention, the above second object is accomplished alternatively by that the hollow extending through the base of the pull-tab attaching lug extends from the base to a base of the end projection projecting from a lower surface of a distal end of the pull-tab attaching lug.
According to a fourth aspect of the invention, the above third object is accomplished by that the gap between the upper wing and the end projection of the pull-tab attaching lug has a size substantially equal to the thickness of the attachment ring of the pull tab before the attachment ring of the pull tab is threaded on the pull-tab attaching lug.
According to a fifth aspect of the invention, the above third object is accomplished alternatively by that the upper wing has in its upper surface a recess extending from the rear end forwardly in a range beyond a position underneath the end projection, the recess having an arcuate transverse cross section and a width larger than the width of the end projection.
According to a sixth aspect of the invention, the above third object is accomplished in another alternative form by that the recess formed in the upper wi

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