| 摘要 |
Pad comprises at least 1 resilient layer with one surface which can resiliently deform and take a set for sealing a hole, and a second surface carrying a contact adhesive layer (18) initially covered by a release layer (20) which is removable for attaching the pad to a key cup. The pad is entirely of plastics and the layers are coextensive and slightly larger than cup i.d. so that the pad is compressed on assembly and then expands to be held securely in the cup. The resilient material pref. comprises two layers of plastics foam, the hole sealing layer (12) being of cross-linked ethylene vinyl acetate and the other (16) of closed-cell foam and less resilient and less stiff than the first. The key and pad may be for a tone hole in a woodwind instrument, or a spit hole in a brass instrument. |
