Patent ID: 7291776
Filing Date: 2007-11-06
Classification: G10D

Abstract:
1. In combination, a) a drum having a drum head to be struck by a beater, creating enhancement of air pressure within the drum, b) and an adjustable valve carried on the drum and having a means for adjusting venting of air pressure from within the drum to the drum exterior, c) said valve including an air flow throttling component or components; d) said valve is carried by a shell defined by the drum; e) said means includes a movable adjuster for varying the flow of air through the valve from the drum interior to the drum exterior; f) said valve includes a body attached to the drum to extend in the shell, said adjuster extends from within the body to the exterior, for manual displacement between selected positions to control said venting; g) said adjuster having radially extending air flow throttling holes that communicate with the drum exterior via a by-pass channel, and the adjuster has axial porting that communicate with said throttling holes and the drum interior.