Push-button tuner

A push-button tuner comprising:

• a support, tuning means mounted on said support in a manner so that said tuning means is movable to positions corresponding to tuned frequencies for producing the tuned frequencies, and a plurality of presettable tuning mechanisms for adjusting said tuning means to move selectively to positions respectively corresponding to specific frequencies, in which each of said tuning mechanism comprises:
• a rotatable operation member movable between a front non-actuation position and a rear actuation position, said operation member being normally urged to said front non-actuation position, said operation member having a drive rotary body and a push-button provided at an end of said operation member, said push-button defining a rotating knob for effecting rotation of the operation member;
• a pair of rotatable tuning members each having a driven rotary body selectively engaged with said drive rotary body to thereby rotate together with said drive rotary body, each of said rotatable tuning members being supported by said support in a manner so that said rotatable tuning member is normally urged to said front non-actuation position while it is movable between said front non-actuation position and said rear actuation position, each of said rotatable tuning members having a longitudinally extending threaded portion and a tuning piece threadedly engaged with said threaded portion, said tuning piece being movable in the frontward and rearward directions in response to the rotation of said tuning member;
• an engagement mechanism coacting with said operation member for engaging with said pair of tuning members such that said pair of tuning members are alternately displaced to said rear actuation position relative to said operation position every one reciprocation of said operation member between said front non-actuation position to said rear actuation position;
• an enlarging mechanism for enlarging the amount of movement of said operation member toward said rear actuation position and for transmitting the enlarged amount of movement to one of said tuning member which is movable to said rear actuation position;
• said tuning means including an actuator plate for engaging with said tuning piece of one of said pair of tuning members which is in said rear actuation portion for adjusting said tuning means;
• and
• said push-button tuner further comprising locking means including a lock member for holding any one of said tuning members so as to permit the transmission of rotation between said drive rotary body and said driven rotary body when said one tuning member is located in said rear actuation position and for releasing said one tuning member held in said rear actuation position when another tuning member is displaced to said rear actuation position.