Keyboard instrument with keyboard cover mechanism

A keyboard instrument comprising:

• an instrument main body having a keyboard portion arranged thereon;
• a keyboard cover for opening/covering said keyboard portion on said instrument main body;
• a keyboard cover opening/closing mechanism for performing an opening/closing operation of said keyboard cover by causing said keyboard cover to pivot about a rear end portion thereof in relation to said instrument main body, said open/closing mechanism including a guide means for moving said rear end portion in an arc to store the rear end portion in the instrument main body;
• and
• damping force generating means for generating a damping force for reducing a pivoting force base on a weight of said keyboard cover from a predetermined position between a cover closing position and a cover opening position in both an opening direction toward the opening position from the predetermined position and a closing direction toward the closing position from the predetermined position in accordance with the opening/closing operation of said keyboard cover, the damping force in both the opening direction and the closing direction being zero at the predetermined position.

A keyboard instrument comprising:

• an instrument main body having a keyboard portion arranged thereon;
• a keyboard cover for opening/covering said keyboard portion on said instrument main body;
• a keyboard cover opening/closing mechanism for performing an opening/closing operation of said keyboard cover by causing said keyboard cover to pivot about a rear end portion thereof in relation to said instrument main body;
• an opening formed in a rear surface of said instrument main body to extend in directions to two side surfaces of said instrument main body;
• and
• a foreign object removal panel having an inclined surface between a top board of said instrument main body and said keyboard cover opening/closing mechanism, said inclined surface being formed such that an object which falls from a gap formed between said top board and said keyboard cover upon opening/closing said keyboard cover is slid to said opening.

A keyboard instrument comprising:

• an instrument main body having a keyboard portion arranged thereon;
• a keyboard cover for opening/covering said keyboard portion on said instrument main body;
• a keyboard cover opening/closing mechanism for performing an opening/closing operation of said keyboard cover by causing said keyboard cover to pivot about a rear end portion thereof in relation to said instrument main body, said open/closing mechanism including a guide means for moving said rear end portion in an arc to store the rear end portion in the instrument main body;
• and
• an elastic member for biasing said keyboard cover so as to restrict pivoting movement of said keyboard cover in both a closing direction toward a closing position of said cover and in an opening direction toward an opening position of said cover operation, said elastic member being attached to said keyboard cover opening/closing mechanism so as to reduce the biasing force immediately before said cover reaches said closing position and said opening position.

A structure having a cover comprising:

• a main body having an opening portion in a longitudinal direction;
• a cover which pivots about a rear end portion thereof to open/cover said opening portion back and forth on said main body;
• a link member having one end pivotally supported on said main body, and another end pivotally supported at a first position of the rear end portion of said cover;
• a guide abutment portion arranged at a second position, said second position being separated from the first position in a direction of a rear surface of said main body by a predetermined distance;
• and
• a guide member, fixed in said main body, for causing said guide abutment portion to be moved in contact with said guide member upon opening/closing of said cover.

A structure comprising:

• a main body having an opening portion;
• a cover for opening/covering said opening portion on said main body;
• a cover opening/closing mechanism for performing an opening/closing operation of said cover by causing said cover to pivot about a rear end portion thereof in relation to said main body, said open/closing mechanism including a guide means for moving said rear end portion in an arc to store the rear end portion in the main body;
• and
• damping force generating means for generating a damping force for reducing a pivoting force based on a weight of said cover from a predetermined position between a cover closing position and a cover opening position both an opening direction toward the opening position from the predetermined position and a closing direction toward the closing position from the predetermined position in accordance with the opening/closing operation of said cover, the damping force in both the opening direction and the closing direction being zero at the predetermined position.

A structure comprising:

• a main body having an opening portion;
• a cover for opening/covering said opening portion on said main body;
• a cover opening/closing mechanism for performing an opening/closing operation of said cover by causing said cover to pivot about a rear end portion thereof in relation to said main body, said open/closing mechanism including a guide means for moving said rear end portion in an arc to store the rear end portion in the main body;
• and
• an elastic member for biasing said cover so as to restrict pivoting movement of said cover in both a closing direction toward a closing position of said cover and in an opening direction toward an opening position of said cover due to a weight thereof at a latter stage of the opening/closing operation, said elastic member being attached to said cover opening/closing mechanism so as to reduce the biasing force immediately before said cover reaches said closing position and said opening position.