| 摘要 |
<p>A CAPTIVE PANEL FASTENER IS MANUFACTURED BY FIRST OVER MOLDING A PLASTIC CAP AROUND THE HEAD OF A SCREW, THE CAP HAVING A CYLINDRICAL PLASTIC SKIRT EXTENDING DOWNWARDLY BEYOND THE BASE OF THE SCREW HEAD AND FORMED WITH A CIRCULAR OPENING AT THE BOTTOM. AFTER A COMPRESSION SPRING IS PLACED AROUND THE SHANK OF THE SCREW, THE SCREW IS PRESSED AGAINST A TOP SURFACE OF A FERRULE TO A POINT WHERE THE CAPPED-SKIRT EXTENDS DOWNWARDLY BELOW A FERRULE FLANGE. AT THAT POINT, HEAT AND PRESSURE ARE APPLIED RADIALLY INWARDLY AROUND THE PERIPHERY OF THE PLASTIC SKIRT ALONG ITS BOTTOM EDGE UNTIL IT IS PERMANENTLY DEFORMED TO A POINT WHERE THE BOTTOM OF THE SKIRT IS SMALLER IN DIAMETER THAN THE FERRULE FLANGE. THE SCREW IS THEREBY CAPTIVATED TO THE FERRULE BETWEEN EXTENDED AND RETRACTED POSITIONS.</p> |
