Captive washers of a drum

Details Captive washers of a drum Captive washers of a drum

2007-11-06

2007-11-06

Lockett, Kimberly (Department: 2837)

Music

Instruments

Drums

Reexamination Certificate

active

11331761

ABSTRACT:
Captive washers are used with tension control devices on a drum having a drum shell, two drum hoops, two drumheads and multiple tension control devices. Each tension control device is mounted on the drum shell and has a mounting post, a connector and two adjusting bolts. Each captive washer presses against the drum hoop and has a flange, a lip, an annular groove and a through hole. The annular groove is formed between the flange and the lip and is mounted securely in an elongated groove in the drum hoop to hold the captive washer in the drum hoop. The through hole extends longitudinally through the captive washer.

REFERENCES:
patent: 4630521 (1986-12-01), Alletto
patent: 5106250 (1992-04-01), Fischer et al.
patent: 2006/0156898 (2006-07-01), Nickel

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