Patent ID: 6586665
Filing Date: 2003-07-01
Classification: G10D

Abstract:
A drum comprising:a cylindrical drum body including a chamber formed therein and defined by an inner peripheral surface, and including an upper portion, and including an outer peripheral portion, a ring engaged in said upper portion of said drum body and engaged with said inner peripheral surface of said drum body, said ring including two edges, a membrane engaged onto said upper portion of said drum body, and including a peripheral skirt secured onto said outer peripheral portion of said drum body, and means for adjusting said ring to tension and to release said membrane, said adjusting means including means for moving said edges of said ring toward and away from each other to tension and to release said membrane, said moving means including two blocks secured to said edges of said ring, and means for forcing said blocks toward and away from each other to tension and to release said membrane, said blocks each including an inclined inner surface facing toward each other, said forcing means including a follower engaged between said inclined inner surfaces of said blocks, and means for actuating said follower to move relative to said blocks and to force said blocks toward and away from each other.