Method for producing a mass production ear plug
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United States of America Patent
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Feb 21, 1989
Issued Date -
N/A
app pub date -
Feb 2, 1987
filing date -
Oct 20, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a novel apparatus and method of manufacturing an ear plug assembly wherein the plug member is made of foam or similar material. By creating an assembly where the plug member can be confined in a chamber while gas is blown into the chamber, the plug member becomes semi-rigid and permits a piercing object to cut a slit in the plug member without causing it to buckle. If the speed of the cutting blade is at least 75 inches per second, the speed will compensate for the non-rigidity of the plug and it is not necessary to blow gas into the plug. Adhesive added at the location of the slit acts as a lubricant to permit a cord to be inserted into the plug member while at the same time acting as a bonding agent.
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Family
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