Modular telephone keyset structure
AssigneeSiemens Aktiengesellschaft
InventorsDeepak Muzumdar, William Levine, Gerry Suarez, Rolf Schneider, Theodore W. Wagner
Life of this patent
Estimating the term…
Abstract
A modular telephone keyset instrument is arranged within a rectangular casing having indentations in the top for receiving a telephone handset. Electrical (electronic) circuits are provided on a mother PC board, a daughter PC board and a key switch PC board, stacked within the housing from bottom to top, respectively. The daughter and keyset PC boards are connected to the mother PC board by ribbon cables. A hook switch, mounted on and attached to the daughter PC board extends through one of the indentations in the top to sense whether the telephone handset is placed in the indentations.
Claims23
A telephone keyset structure comprising, in combination:
- (a) a substantially rectangular casing having a bottom, a top and four sides, said top having two indentations on one side thereof for receiving the microphone and earphone, respectively, of a telephone handset and having a plurality of openings in the central portion thereof for receiving telephone keys:
- (b) a mother printed circuit board adapted to be electrically connected with a telephone subscriber line and with said handset, said mother printed circuit board being arranged within said casing above and substantially parallel to said bottom and being laterally coextensive with substantially all of said bottom;
- (c) a daughter printed circuit board arranged within said casing above and substantially parallel to said mother printed circuit board and being laterally coextensive with at least the portion of said mother printed circuit board which lies beneath said indentations of said top;
- (d) a key switch printed circuit board arranged within said casing above said daughter printed circuit board and directly beneath said top, said key switch printed circuit board being substantially parallel with said top and being laterally coextensive with the central portion of said top which includes said openings for said keys but excludes said indentations;
- (e) a first, flexible electrical cable connecting said mother printed circuit board with said daughter printed circuit board;
- (f) a second flexible, electrical cable connecting said mother printed circuit board with said key switch printed circuit board;
- (g) a telephone hook switch, mounted on said daughter printed circuit board and having a portion thereof extending through one of said indentations in said top, said hook switch being adapted to be actuated when said telephone handset is placed in said indentations;
- and
- (h) a plurality of telephone key switches mounted on said key switch printed circuit board and having telephone keys extending through said openings in said top to permit manual actuation thereof.
Dependencies are inferred from the claim text.