PERCUSSION MUSICAL INSTRUMENT DRUM-HEAD SKIN TENSIONING ASSEMBLY AND DRUM SHELL CONSTRUCTION THEREFOR

摘要

One (12) of a pair of concentric ring hoops (12, 13) overlaps the other (13) and holds the perimeter edge of a drum-head vibratile element (20) in tension between the mating overlapping faces of the hoops (12, 13). The hoops. - (12, 13) are held together by a tensioning bolt (15) threadable into a bracket (14) connected to a lower hoop (17) which has another skin (18) stretched between a stepped inner annular grove (54) on its inner face edge. A drum shell (22) made of a composite of rigid foam interior spaced apart by a pair of epoxy impregnated carbon fibre sheets is held by the lower second drum skin (18) into enclosing engagement on its upper perimeter edge with an inner stop flange (46) and .vertical wall face of the inner hoop ring (13) of the drum head vibratile skin assembly.