Patent ID: 6963022
Filing Date: 2005-11-08
Classification: G10D

Abstract:
1. A head diaphragm adjustor for a drum for adjusting tension applied to an upper head diaphragm and a lower head diaphragm of the drum, wherein the head diaphragm adjustor is one of a plurality of head diaphragm adjustors attachable to an outer surface of a shell of the drum, the head diaphragm adjustor comprising: a first bolt operated to adjust the tension applied to the upper head diaphragm; a second bolt operated to adjust the tension applied to the lower head diaphragm; a first meshed portion meshed with the first bolt and fixable to the outer surface of the shell of the drum; a second meshed portion meshed with the second bolt and fixable to the outer surface of the shell of the drum; a rod including an upper portion, a lower portion, and a cylindrical portion, the upper portion of the rod being inserted in the first bolt in a manner independently rotatable relative to the first bolt, the lower portion of the rod being connected to the second bolt in a manner slidable relative to the second bolt and rotated integrally with the second bolt, and the cylindrical portion of the rod having a diameter greater than that of the upper portion of the rod, the first bolt having a lower end surface abutting against an upper end surface of the cylindrical portion.