Patent ID: 7928303
Filing Date: 2011-04-19
Classification: G10D

Abstract:
1. Apparatus for lowering the fundamental frequency of a cajon drum, wherein said drum comprises four wooden side walls and a wooden top, wherein a first wooden side wall is the drumhead, wherein an opening is formed in a second side wall of said drum, comprising: a cylindrical insert, said cylindrical insert having a cylindrical body, said body being adapted to be slid into said opening, said insert having a flared flange at the outer end of said body and mounting means for connecting said insert to said second wooden side wall, wherein said mounting means includes a resilient band extending around said body adjacent said flange, and said mounting means also includes a resilient ring between said flange and said second wooden side wall, whereby said insert and said flange are resiliently suspended relative to second side wall to reduce vibrations otherwise caused by contact between said insert and said second side wall and to allow said insert to move relative to said side wall. wherein the weight of said insert and the length and width of said body of said insert are sized to lower the fundamental frequency of said drum.