Patent ID: 8686264
Filing Date: 2014-04-01
Classification: G10D,G10H,Y10T

Abstract:
1. A percussion instrument comprising: a mainframe having an opening on an upper side thereof, the mainframe having a bottom part that forms a lower surface thereof, a cylindrical frame outer circumference part that extends upright at a peripheral portion of the bottom part, a frame inner circumference part that has a cylindrical shape smaller in diameter than the frame outer circumference part and extends upright on the bottom part on an inner circumferential side of the frame outer circumference part, and bolt holes through the bottom part at positions between the frame inner circumference part and the frame outer circumference part through which the bolts can be inserted; a head arranged on the upper side of the mainframe, the head being tensioned over an upper end portion of the frame inner circumference part of the mainframe; a ring-shaped hoop structure for applying tension to the head, the hoop structure being disposed between the frame outer circumference part and the frame inner circumference part of the mainframe; and a plurality of bolts extending through the bolt holes of the mainframe, each of the bolts has a male threaded part and a head part connected to one end of the male threaded part, the head part having an external contour greater than an outer diameter of the male threaded part; wherein the hoop structure has recessed parts that are recessed in a lower surface thereof and include female threads that engage, in a threading manner, the male threaded parts of the bolts extending through the bolt holes in the bottom part of the mainframe, to affix the hoop structure to the mainframe.