Drumhead construction
US4779508A · kind A · utility
9Cited by
3References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1987 |
| Grant date | Oct 25, 1988 |
| Priority date | — |
| Expiry date | Jun 15, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10D13/20
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A drumhead which includes a polyester film having a marginal flange bonded in a channel presented by metal hoop. Fiber reinforced polyester resin is poured into the channel and embeds the edge of the drumhead flange upon hardening. An inturned lip on the outside wall of the channel provides an interference fit with the resin to securely hold it in the channel. The upper edge of the inside wall of the channel is beveled at the same angle as the drumhead flange to provide a flat surface for the drumhead to seal against. A special spring clip is applied within the channel to secure the butt joint between opposite ends of the hoop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.