Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kuo-Chang Chen0
Date of Patent
November 6, 2007
Patent Application Number
11331761
Date Filed
January 13, 2006
Patent Primary Examiner
Patent 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.
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