Integral sliding member of a slide fastener and the molding device thereof

A molding device for injection molding a sliding member of a slide fastener, comprising:

• a first mold;
• a second mold movable toward and away from said first mold, thereby closing and opening said molding device;
• at least one set of molding parts;
• said at least one set of molding parts including:
• a first upper movable molding part in said first mold;
• a second upper movable molding part in said first mold;
• a third upper movable molding part in said second mold;
• a fourth upper movable molding part in said second mold;
• said first, second, third and fourth upper molding parts being movable away from each other on completion of molding said sliding member;
• each of said upper movable molding parts including first and second independent and chain-linking sub-cavities therein;
• all of said first and second independent chain-linking sub-cavities in said first, second, third and fourth movable molding parts, when all four upper movable molding parts are brought together, fitting together to form first and second independent, but chain-linking cavities;
• said first cavity being a first portion of a pulling tab said sliding member;
• said second cavity being a ring-shaped portion of said sliding member;
• said first portion of a pulling tab and said ring-shaped portion of said sliding member being independent and chain-linked;
• each of said first, second, third and fourth upper movable molding parts including a surface which is slanted with respect to a direction of relative movement between said first and second molds;
• all of said surfaces being effective for guiding a movement of its respective upper movable molding part with respect one of said first and second molds;
• a first lower molding part affixed to said first mold;
• a second lower molding part affixed to said second mold for forming, together with said two molds and said upper movable molding parts, a slide body of said slide fastener;
• a first upper stationary molding part detachably affixed to said first mold;
• a second upper stationary molding part detachably affixed to said second mold;
• at least one of said first and second upper stationary molding parts including a tab sub-cavity which, when said first and second upper stationary molding parts are brought together, form a cavity for a second portion of said pulling tab;
• said tab sub-cavity communicating with said first cavity, when said mold is closed, whereby said second portion of said pulling tab is integrally molded with said first portion of said pulling tab;
• and
• inclusion of said tab sub-cavity in said first and second upper stationary molding parts permitting easy change in shape of said second part, without disturbing a remainder of said molding apparatus.