Keyboard device for keyboard instrument
AssigneeKabushiki Kaisha Kawai Gakki Seisakusho
InventorTsutomu Yamaguchi
Life of this patent
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Abstract
A keyboard device for a keyboard instrument includes a keyboard chassis, a key disposed on the keyboard chassis, and a key support mechanism which supports the key from below and causes the key to operate such that the key pivotally moves about a virtual pivot. One of a first arm rear-side connecting portion and a second arm front-side connecting portion includes an engagement shaft extending in a left-right direction, and the other of them includes an engagement recess which has a U shape in side view and open in one of a front direction and a rear direction and is engaged with the engagement shaft. A cushioning member in sliding contact with an inner surface of the engagement recess is mounted on the engagement shaft in a state covering an outer peripheral surface of the engagement shaft.
Claims10
A keyboard device for a keyboard instrument, including:
- a keyboard chassis,
- a key extending a predetermined length in a front-rear direction and disposed on the keyboard chassis, and
- a key support mechanism engaged with the keyboard chassis and provided so as to support the key from below, the key support mechanism causing, upon depression of the key, the depressed key to operate such that the key pivotally moves about a virtual pivot located rearward of a rear end of the key,
- wherein the key support mechanism comprises:
- a first arm configured to extend a predetermined length in the front-rear direction and be swingably engaged with a first pivot shaft provided on the keyboard chassis, the first arm having a front end pivotally and slidably connected to a front portion of the key;
- and
- a second arm configured to extend a predetermined length in the front-rear direction and be swingably engaged with a second pivot shaft provided on the keyboard chassis at a location rearward of the first pivot shaft, the second arm having a rear end pivotally connected to a rear portion of the key, and including a second arm front-side connecting portion which is disposed forward of the second pivot shaft and is pivotally and slidably connected to a first arm rear-side connecting portion rearward of the first pivot shaft of the first arm,
- wherein one of the first arm rear-side connecting portion and the second arm front-side connecting portion includes an engagement shaft extending in a left-right direction,
- wherein the other of the first arm rear-side connecting portion and the second arm front-side connecting portion includes an engagement recess engaged with the engagement shaft, and
- wherein a cushioning member in sliding contact with an inner surface of the engagement recess is mounted on the engagement shaft in a state covering an outer peripheral surface of the engagement shaft.
A keyboard device for a keyboard instrument, including:
- a keyboard chassis,
- a key extending a predetermined length in a front-rear direction and disposed on the keyboard chassis, and
- a key support mechanism engaged with the keyboard chassis and provided so as to support the key from below, the key support mechanism causing, upon depression of the key, the depressed key to operate such that the key pivotally moves about a virtual pivot located rearward of a rear end of the key,
- wherein the key support mechanism comprises an arm configured to extend a predetermined length in the front-rear direction, the arm being pivotally engaged with a pivot shaft provided on the keyboard chassis and extending in the left-right direction, and having one end engaged with the key, and
- wherein the arm includes a bearing portion via which, when the arm is engaged with and disengaged from the pivot shaft during assembly or maintenance of the keyboard device, the arm can be mounted on the pivot shaft from above the keyboard chassis and can be removed from the pivot shaft upward of the keyboard chassis, while being held in a predetermined posture.
Dependencies are inferred from the claim text.