Slider for slide fastener

A slider, comprising a slider base, a pull-tab, a connecting shaft and a spring;

• the slider base comprises an upper blade, a lower blade, and a connecting pin connecting the upper blade and the lower blade;
• wherein,
• said pull-tab is integrated with the connecting shaft;
• the pull-tab comprises a pull-tab body, with a spring mounting part and a locking part set at the anterior-end of the pull-tab body;
• the spring mounting part and the locking part are adjacent to each other;
• the anterior-end-face of the locking part is set as a locking vertical plane and the bottom of the locking part is set as cambered surface;
• an interconnected gap is set between the anterior-end-face of the spring mounting part and the bottom of the spring mounting part;
• the connecting shaft is fixed to the anterior-end of the pull-tab body and the length of the connecting shaft is larger than the width of the anterior-end of the pull-tab body;
• the connecting shaft runs through the spring mounting part and the locking part, and is set closer to the anterior-end-face of the locking part, and extends to both sides of the anterior-end of the pull-tab body;
• the spring mounting part has a spring mounting hole with a gap, which is set and twisting the connecting shaft;
• a spring mounting slot interconnected with the spring mounting hole and tangent to the spring mounting hole with a gap is formed when the bottom of the spring mounting part extends towards the pull-tab body;
• the upper blade has a square-shaped notch for disposing the pull-tab;
• the square-shaped notch comprises an further sunken concave surface, which matches with the bottom cambered surface at the anterior-end of the locking part of the pull-tab;
• anterior-end of the sunken concave surface connects to the anterior-end of the square-shaped notch and forms a lug boss at the anterior-end of the square-shaped notch, and the rear-end of the sunken concave surface connects to the rear-end plane of the square-shaped notch;
• the anterior-end of the square-shaped notch and the upper blade forms a vertical plane, and both sides of the square-shaped notch has a first upper blade lateral side and a second upper blade lateral side set at both sides of the upper blade;
• two raised convex parts are set on the first upper blade lateral side, and said two raised convex parts and the first upper blade lateral side forms a U-shaped groove;
• a first connecting-shaft through hole is formed with the two raised convex parts riveting to each other through the interior of the U-shaped groove;
• a second connecting-shaft through hole is set at the second upper blade lateral side;
• the second connecting-shaft through hole comprises a spring assembling hole and a conducting slot interconnected with the spring assembling hole;
• the spring assembling hole and conducting slot matches with the spring mounting hole and the spring mounting slot set at the anterior-end of the pull-tab body, and an annular slot with a gap is also set on the second upper blade lateral side;
• a first extending end and a second extending end are set at two ends of the spring, wherein the second extending end has a corner;
• when the slider is assembled, the connecting shaft integrated with the pull-tab and the second connecting-shaft through hole sets the pull-tab on the upper blade of the slider base by the U-shaped groove;
• a first connecting-shaft through hole is formed with the two raised convex parts on the first upper blade lateral side riveting to each other through the interior of the U-shaped groove, so as to fix the pull-tab to the upper blade of the slider base;
• the spring is assembled by the spring assembling hole and conducting slot set at the second upper blade lateral side, when it is assembled, the spring gets into the spring mounting hole through the spring assembling hole, the second extending end having a corner gets into the spring mounting slot through conducting slot;
• when the spring is assembled and fixed, the spring is in a compressed state, and the first extending end of the spring clips into the annular slot and withstood by the annular slot.