Key dialling assembly with lock - having matching covers fitting over all or selected keys and mounted on locking bar

摘要

The key dialling assembly includes an upper bracket (132) with a locking bar (127) fixed by a lock (128) having accurately formed offset hoods (131) to fit over the main keyboard buttons (114). This provides a transversal interlock between the top bracket (132) and the keyboard buttons (114) so that the bracket cannot laterally be shifted when locked. Certain key buttons that are required for emergency or undebited external calls may be left accessible through openings (118/1, 118/2, 118/0). The keyboard (137) for internal calls need not be affected by the outgoing call blockage. The upper bracket (132) is constricted in such a.