| US 7,560,632 B1 | ||
| Bass drum with compliant resonant head | ||
| Kenneth W. Lanzel, 1413 Charles St., Apt. C, La Crosse, Wis. 54603 (US); and Ryan R. Torgerson, 2431 Wood St., La Crosse, Wis. 54603 (US) | ||
| Filed on Jul. 17, 2006, as Appl. No. 11/487,632. | ||
| Int. Cl. G10D 13/02 (2006.01) | ||
| U.S. Cl. 84—411R | 21 Claims |
| 1. A drum, comprising:
a first diaphragm adapted to be struck;
a second diaphragm; and
a shell extending between the first diaphragm and the second diaphragm, the shell is generally cylindrical to define a longitudinal
centerline, the first diaphragm has a first natural frequency of vibration in a longitudinal direction parallel to the longitudinal
centerline, the second diaphragm has a second natural frequency of vibration in the longitudinal direction, the first natural
frequency is higher than the second natural frequency, and the second diaphragm moves primarily in fluid dynamic reaction
to movement of the first diaphragm rather than being moved by some electromagnetic force.
|