Drum with head adjusting device

Details Drum with head adjusting device Drum with head adjusting device

2007-12-11

2007-12-11

Donovan, Lincoln (Department: 2837)

Music

Instruments

Drums

C411S187000

Reexamination Certificate

active

11042943

ABSTRACT:
A drum includes a cylindrical body, a cylindrical head frame, which is fitted to the outer circumference of the body, a hoop located at the outer circumference of a head, lugs located at the outer circumference of the body, lug nuts, and lug bolts. A loosening prevention structure is located between the lower surface of the head of each lug bolt and the upper surface of the hoop. Each loosening prevention structure is formed by a washer with rubber according to a preferred embodiment. The washer with rubber is formed by an annular elastic body and a bowl-shaped cover. The elastic body is made of rubber. The cover includes a cylindrical portion, which covers the outer circumference of the elastic body. The cylindrical portion is formed to be shorter than the elastic body along the axial direction of the body.

REFERENCES:
patent: 4875818 (1989-10-01), Reinwall
patent: 5193960 (1993-03-01), Fukushima et al.
patent: 5208412 (1993-05-01), Hoshino
patent: 6048150 (2000-04-01), Clarke
patent: 6231286 (2001-05-01), Bogatz et al.
patent: 6686527 (2004-02-01), Hagiwara
patent: 6828495 (2004-12-01), Ishimatsu
patent: 05-307383 (1993-11-01), None

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