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US 4,260,575 AGranted
Method for molding ear cushions
AssigneeKoss Corporation
InventorsDonald G. Thew, Lane Gehrig
Life of this patent
Estimating the term…
Abstract
Ear cushions for headphones are formed from an open cell polyurethane foam material. An ear cushion blank is cut from the material and compressed to a desired shape between a holder and a forming tool. Heated air is forced through the porous material to set it to a contoured shape. The molding process can be performed quickly without damaging the cellular structure.
Claims7
A method of forming an ear cushion from porous foam material, the steps comprising:
- cutting an ear cushion blank from a flexible porous thermal formable foam material;
- compressing the ear cushion blank with a forming tool to a selected shape;
- and
- forcing a gas which is heated to within the thermal forming temperature range through the porous foam material such that the ear cushion retains a desired shape when the forming tool is removed.
1 more element
Dependencies are inferred from the claim text.