| 摘要 |
A piezoceramic capsule for telephone instruments, of the type comprising a terminal-holder spool, a piezoceramic diaphragm in pressure contact with nail-shaped feed-through terminals forced in the spool, an elastic O-ring for producing the contact pressure and a perforated case housing them, is modified to transform the case into a cover-up disc and the spool into a case being provided with a stepped cylindric cavity designed to house, from the bottom to the top, respectively the diaphragm, the elastic O-ring and the cover-up disc. A plurality of resilient pawls are formed by pressing inside respective cuts provided in the sidewall of the opening of said cylindric cavity and designed to snap on said cover-up disc in a closure position. <IMAGE> |
