Patent ID: 7291777
Filing Date: 2007-11-06
Classification: G10D

Abstract:
1. A captive washer used with a tension control device on a drum having a cylindrical drum shell, two annular drum hoops having multiple elongated holes formed through the annular drum hoops, two drumheads and multiple tension control devices; with the captive washer having an inner end; an outer end; a flange formed on and protruding radially out from the inner end and adapted for pressing against one of the annular drum hoops; a lip formed around and protruding radially out from the inner end of the captive washer and adapted for engaging one of the multiple elongated holes in a corresponding annular drum hoop, with the lip having a smaller diameter than the flange, with the lip insertable through the one of the multiple elongated holes; an annular groove formed between the flange and the lip, with the annular groove having a smaller diameter than the lip and adapted for engaging the one of the multiple elongated holes in the corresponding annular drum hoop to hold the captive washer in the one of the multiple elongated holes; and a through hole formed longitudinally through the captive washer from the flange to the lip, with the inner end, the outer end, the flange, the lip, the annular groove and the through hole formed as a single, unseparatable piece.