| 摘要 |
<p>An earplug (12), includes a body (14), of soft elastomeric material such as a soft resilient foam for insertion in the ear canal, and a stiffener (16), of more rigid material than the body (14). The stiffener (16), is in the form of a tube rather than a solid rod, so while the stiffener is resistant to column-like collapse, it is easily radially compressed to facilitate compression of the body as it enters the ear canal. The stiffener tube can be filled with soft resilient foam material, to block the passage of sound through the tube. The tubular stiffener can have a slot extending parallel to the length of the stiffener, to allow soft foam material to flow into the tube to fill it, as the foam material that surrounds the tube is molded. Such molding can be accomplished by extruding foam material while the tubular stiffener passes with the extruded foam through the extrusion head.</p> |
