Telephone system

A telephone system comprising:

• a corded telephone set having the CODEC function for converting a digital signal input from a digital line to an analog signal;
• a cordless telephone set having a talk switch;
• and
• a relay lifter;
• wherein said relay lifter comprises:
• a hook switch ON/OFF unit for providing ON/OFF control according to a first control signal responding to said talk switch of said cordless telephone set so that said hook switch of said corded telephone set is turned OFF when said first control signal is in a first state and a hook switch of said corded telephone set is turned ON when said first control signal is in a second state;
• and
• a voice switching unit for switching connection of an aural signal in said corded telephone set to said corded telephone set when a second control signal is in a first state and to said cordless telephone set when said second control signal is in a second state, said second control signal being responsive to said talk switch of said cordless telephone set, wherein said hook switch ON/OFF unit comprises a driving motor rotated in response to said first control signal;
• a rod located between a main body of said corded telephone set and a handset thereof;
• a slider connected to said rod, having a gear section in one portion thereof, and moving said handset of said corded telephone set toward or away from said hook switch by moving up and down;
• a worm gear attached to a rotation shaft of said driving motor for transferring and converting rotational movement of said driving motor to said slider for converting rotation of the driving motor to up/down movement of the slider;
• and a clutch gear linked to said worm gear as well as to a gear section of said slider section for preventing a predetermined amount of movement of said slider and a predetermined amount of rotation of said driving motor.

A telephone system comprising:

• a corded telephone set having the CODEC function for converting a digital signal input from a digital line to an analog signal;
• a cordless telephone set having a talk switch;
• and
• a relay lifter;
• wherein said relay lifter comprises:
• a hook switch ON/OFF unit for providing ON/OFF control according to a first control signal responding to said talk switch of said cordless telephone set so that a hook switch of said corded telephone set is turned OFF when said control signal is in a first state and a hook switch of said corded telephone set is turned ON when the first control signal is in a second state;
• and
• a voice switching unit for switching connection of an aural signal in said corded telephone set to said corded telephone set when a second control signal is in a first state and to said cordless telephone set when said second control signal is in a second state, said second control signal being responsive to said talk switch of said cordless telephone set, wherein said relay lifter comprises a detector for detecting an ON/OFF state of said hook switch of said corded telephone set, and said cordless telephone set includes a controller for outputting said first control signal, having a first state where said hook switch of said corded telephone switch is turned OFF, a second state where a hook switch of said corded telephone set is turned ON, a third state where said hook switch of said corded telephone set is OFF and relay lifter is held at an uppermost position, and a fourth state where ON/OFF control for said hook switch of said corded telephone set is not provided, in response to a talk switch of the telephone set as well as to a result of detection by said detector, and also outputting said second control signal in response to said talk switch of said cordless telephone set.