| 摘要 |
<p>The invention relates to a compact, mechanically operated switch which is especially suitable for use in a telephone set having a loudspeaker receiving function.</p><p>The switch includes a housing (2) and, disposed therein, a first and a second rotor (8,9) for opening and closing cooperable contacts (11,12) and a third rotor (10) for restricting the rotation of the second rotor (9) under a certain condition. All the rotors are disposed in axial alignment with each other. The first and second rotors are urged to rotate in one direction while the third rotor is urged to rotate in the other direction by the action of a force greater than that urging the second rotor to rotate in the one direction. A pushbutton (20) is disposed between the first and second rotors (8,9) and acts, when depressed, to forcedly rotate tnem in the other direction so as to establish a loudspeaker receiving circuit. A lock pin (23) cooperates with the pushbutton (20) to lock it in a depressed position. The third rotor (10) includes a lever (37) operatively associated with a handset and having a cam portion (43) which acts to move the lock pin (23) in a manner to unlock the pushbutton when the handset is lifted.</p> |
