Keyboard device for keyboard instrument
AssigneeKabushiki Kaisha Kawai Gakki Seisakusho
InventorMasahiko IWASE
Life of this patent
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Abstract
A keyboard device includes a swingable key, an action unit that executes a predetermined operation in conjunction with key depression, a hammer support disposed on a rear side of the key, and a hammer rotatably supported by the hammer support and placed on the action unit. The key includes a guide groove extending in the front-rear direction and opening rearward at a rear end of the key. The holder of the action unit fixed to the rear end of the key includes: a left side wall bonded to a left side surface of the key, an upper wall bonded to an upper surface of the key, a rear wall positioned on a rear side of a rear surface of the key, and a guide rib extending frontward from the rear wall and inserted into the guide groove.
Claims3
A keyboard device for a keyboard instrument, the device comprising:
- a key that extends for a predetermined length in a front-rear direction, the key being swingable with a fulcrum being in a vicinity of a center in a length direction;
- an action unit that is provided in a rear portion of the key and executes a predetermined operation in conjunction with key depression of the key;
- a hammer support disposed on a rear side of the key;
- and
- a hammer that extends for a predetermined length in the front-rear direction, the hammer being rotatably supported at a rear end of the hammer via a hammer shaft that extends in a left-right direction of the hammer support, the hammer being placed on the action unit via a hammer protrusion provided on an immediate front side of the hammer shaft so as to protrude downward, and the hammer being driven upward via the action unit in accordance with key depression of the key, wherein
- the key is provided with a guide groove extending in the front-rear direction and opening rearward at a rear end of the key,
- the action unit includes a holder fixed to the rear end of the key, and
- the holder includes:
- a side wall bonded to one of side surfaces in the left-right direction of the rear end of the key in a left-right direction;
- an upper wall bonded to an upper surface of the rear end of the key;
- a rear wall positioned on a rear side of a rear surface of the rear end of the key;
- and
- a guide rib extending frontward from the rear wall and inserted into the guide groove.
Dependencies are inferred from the claim text.