Patent ID: 6686527
Filing Date: 2004-02-03
Classification: G10D

Abstract:
A tightening frame for a drum, said tightening frame being mounted on an open end of a drum body of said drum that is provided with a plurality of lugs on an outer surface thereof, pressing a head frame for said drum by being connected to said lugs by tightening bolts and having a circular plate portion, whereinsaid circular plate portion is provided with an elongated bolt attachment openings, each of said bolt attachment openings being closed at both ends thereof and comprised of: primary opening section that extends in a circumferential direction of said tightening frame and allows a shank portion of a tightening bolt solely to pass through, and a secondary opening section which is continuously formed at one end of said primary opening section and allows a head portion of said tightening bolt to pass through; and further comprising a washer disposed between said head of said tightening bolt and said circular plate portion of said head frame, wherein said washer and one of said tightening frame and tightening bolt are magnetically attracted to each other.