Composite drum head
AssigneeResearch Development Systems, Inc.
InventorSamuel N. Muchnick
Life of this patent
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Abstract
A composite drum head, comprising polyaramide fiber fabric impregnated with a rigidifying amount of epoxy polymer.
Claims16
A novel drum head membrane structure having a generally planar central portion and a turned down peripheral portion extending from said central portion a relatively short distance and essentially perpendicular thereto, said structure comprising an interwoven fabric made up of fibers of a polyaramide high molecular weight polymer rigidized with a cured and hardened epoxy resin comprising a cross-linked polymer of a polyglycidyl ether of a polyol, said fabric and epoxy cooperating to define interstitial voids forming air passing micropores in the drum head membrane structure.
A novel drum head comprising:
- a membrane composed of an interwoven fabric made up of fibers of a polyaramide high molecular weight polymer rigidized with a cured and hardened epoxy resin comprising a cross-linked polymer of a polyglycidyl ether of a polyol, said fabric and said epoxy cooperating to define interstitial voids forming air-passing micropores in the drum head membrane structure;
- and
- a ring comprising said cured and hardened epoxy resin embedding the peripheral edge of said membrane.
A novel drum comprising:
- a drum frame;
- and
- a drum head pulled taut across said drum frame and comprising a membrane composed of an interwoven fabric made up of fibers of a polyaramide high molecular weight polymer rigidized with a cured and hardened epoxy resin comprising a cross-linked polymer of a polyglycidyl ether of a polyol, and a ring comprising said cured and hardened epoxy resin embedding the edge of said membrane;
- said fabric and said epoxy cooperating to define interstitial voids forming air passing micropores in said membrane.
A composite drum head having a generally planar central portion and a peripheral flange integrally formed of a polyaramide fiber fabric rigidified with impregnated epoxy polymer, said fabric and polymer cooperating to form air-passing micropores in said drum head.
A composite drum head having a generally planar central portion and a peripheral flange, and comprising a polyaramide fiber fabric, an epoxy polymer impregnant which cooperates with the fabric to form air passing micropores in the drum head, and a rigid resin tensioning anchor ring separately formed on said head to embed the flange edge.
Composite drum head membrane comprising synthetic organic fiber fabric and a fabric stiffening polymer defining therewith interstitial voids forming air passing micropores in the drum head membrane.
Dependencies are inferred from the claim text.