Keyboard musical instrument having an improved cover opening/closing mechanism

A keyboard musical instrument comprising:

• a main body having a pair of left and right cheeks;
• a keyboard section provided in said main body;
• a pair of cover guides provided, respectively, on said left and right cheeks at inner side surfaces thereof within said main body of said keyboard musical instrument;
• a main cover slidable on said cover guides in forward and rearward directions with respect to said main body between an open position and a closed position, said main cover being disposed to cause said keyboard section to be exteriorly exposed at least when it is in said open position;
• first engaging means provided on a predetermined portion of said main cover at or closer to an end thereof toward said open position;
• a sub cover forming a cover together with said main cover and flexibly coupled to said main cover;
• guide means provided in said main body and engaging said sub cover, for downwardly guiding said sub cover as said main cover is slided on said cover guides toward said open position;
• at least one support member having one end and mounted in said main body for pivotal movement in said forward and rearward directions with respect to said main body;
• second engaging means provided on said one end of said support member and disposed to engage said first engaging means when said main cover is slid on said cover auides toward said open position;
• and restraint means provided in said main body at a location above said main cover, for restraining a vertical position of said first engaging means to a range within which said first engaging means can engage said second engaging means, when said main cover is slided on said cover guides toward said open position.

A keyboard musical instrument comprising:

• a main body having a pair of left and right cheeks;
• a keyboard section provided in said main body;
• a pair of cover guides provided, respectively, on said left and right cheeks at inner side surfaces thereof within said main body of said keyboard musical instrument;
• a main cover slidable on said cover guides in forward and rearward directions with respect to said main body between an open position and a closed position, said main cover being disposed to cause said keyboard section to be exteriorly exposed at least when it is in said open position;
• first engaging means provided on a predetermined portion of said main cover at or closer to an end thereof toward said open position;
• a sub cover forming a cover together with said main cover and flexibly coupled to said main cover;
• guide means provided in said main body and engaging said sub cover, for downwardly guiding said sub cover as said main cover is slided on said cover guides toward said open position;
• at least one support member having one end and mounted in said main body for pivotal movement in said forward and rearward directions with respect to said main body;
• and
• second engaging means provided on said one end of said support member and disposed to engage said first engaging means when said main cover is slid on said cover guides toward said open position, wherein said main cover has a lower surface, and the instrument further includes auxiliary support means provided in said main body at a location below a pivotal movement path of a portion of said lower surface of said main cover corresponding to said predetermined portion thereof along which said main cover can move with pivotal movement of said second engaging means, for supporting said main cover in an event of abnormal operation of opening or closing said cover formed by said sub cover and said main cover.

A keyboard musical instrument comprising:

• a main body having a p air of left and right cheeks;
• a keyboard section provided in said main body;
• a pair of cover guides provided, respectively, on said left and right cheeks at inner side surfaces thereof within said main body of said keyboard musical instrument;
• a main cover slidable on said cover guides in forward and rearward directions with respect to said main body between an open position and a closed position, said main cover beino disposed to cause said keyboard section to be exteriorly exposed at least when it is in said open position;
• first engaging means provided on a predetermined portion of said main cover at or closer to an end thereof toward said open position;
• a sub cover forming a cover together with said main cover and flexibly coupled to said main cover;
• guide means provided in said main body and engaging said sub cover, for downwardly guiding said sub cover as said main cover is slided on said cover guides toward said open position;
• at least one support member having one end and mounted in said main bold for pivotal movement in said forward and rearward directions with respect to said main body;
• second engaging means provided on said one end of said support member and disposed to engage said first engaging means when said main cover is slid on said cover guides toward said open position;
• and
• a contact element provided on said sub cover at a rear end thereof, and a cover seating member provided in said main body at a rear side inner surface thereof, for seating said contact element when said cover is in said open position.

A keyboard musical instrument comprising:

• a main body having a pair of left and right cheeks;
• a keyboard section provided in said main body;
• a pair of cover guides provided, respectively, on said left and right cheeks at inner side surfaces thereof within said main body of said keyboard musical instrument;
• a main cover slidable on said cover guides in forward and rearward directions with respect to said main body between an open position and a closed position, said main cover being disposed to cause said keyboard section to be exteriorly exposed at least when it is in said open position;
• first engaging means provided on a predetermined portion of said main cover at or closer to an end thereof toward said open position;
• a sub cover forming a cover together with said main cover and flexibly coupled to said main cover;
• guide means provided in said main body and engaging said sub cover, for downwardly guiding said sub cover as said main cover is slided on said cover guides toward said open position;
• at least one support member having one end and mounted in said main body for pivotal movement in said forward and rearward directions with respect to said main body;
• second engaging means provided on said one end of said support member and disposed to engage said first engaging means when said main cover is slid on said cover guides toward said open position;
• and
• at least one second support member having one end and mounted in said main body at a location rearward of said first-mentioned support member, for pivotal movement in said forward and rearward directions with respect to said main body, and third engaging means provided on said one end of said second support member and disposed to engage said first engaging means in an event that said first engaging means fails to engage said second engaging means when said main cover is slided on said cover guides toward said open position.

A keyboard musical instrument comprising:

• a main body having a pair of left and right cheeks;
• a keyboard section provided in said main body;
• a pair of cover guides provided, respectively, on said left and right cheeks at inner side surfaces thereof within said main body of said keyboard musical instrument;
• a main cover slidable on said cover guides in forward and rearward directions with respect to said main body between an open position and a closed position, said main cover being disposed to cause said keyboard section to be exteriorly exposed at least when it is in said open position;
• first engaging means provided on a predetermined portion of said main cover at or closer to an end thereof toward said open position;
• a sub cover forming a cover together with said main cover and flexibly coupled to said main cover;
• guide means provided in said main body and engaging said sub cover, for downwardly guiding said sub cover as said main cover is slided on said cover guides toward said open position;
• at least one support member having one end and mounted in said main body for pivotal movement in said forward and rearward directions with respect to said main body;
• and
• second engaging means provided on said one end of said support member and disposed to engage said first engaging means when said main cover is slid on said cover guides toward said open position, wherein said sub cover has a front end, and said first engaging means has a lower end, said main cover having a rear end thereof superposed upon said front end of said sub cover, said front end of said sub cover having a lower surface loosely downwardly curved and located slightly below said lower end of said first engaging means.