Key for musical instrument
AssigneeKabushiki Kaisha Kawai Gakki Seisakusho
InventorsMakoto Kanemitsu, Mitsuo Yamashita, Hiroyuki Kurita, Masahiko Abiko
Life of this patent
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Abstract
A key is provided for permitting simple attachment of a weight and easy adjustment of a touch load, while using an alternative material for substitution for lead as a material for the weight, to thereby reduce the manufacturing cost. A swingable key body is formed with an embedding hole. The weight is made of a composite material produced by blending a plurality of kinds of materials except for lead in a predetermined blending proportion to have a predetermined specific gravity, and is removably attached to the embedding hole of the key body.
Claims25
A key comprising:
- a swingable key body formed with an embedding hole;
- and
- a weight made of a composite material produced by blending a plurality of kinds of materials except for lead in a predetermined blending proportion so as to have a predetermined specific gravity, said weight being removably attached to said embedding hole of said key body,
- wherein one of said plurality of kinds of materials comprises an elastic material, so that said weight has elasticity, and is removably attached to said embedding hole of said key body through press fitting
- wherein said elastic material comprises rubber, and another one of said plurality of kinds of materials comprises powdered tungsten.
A key according to claim 2, wherein said weight comprises a plurality of types of weights made by blending said elastic material and said other one of said plurality of kinds of material in different blending proportions from one another to have different specific gravities from one another.
A key comprising:
- a swingable key body formed with an embedding hole;
- a weight made of a composite material produced by blending a plurality of kinds of materials except for lead in a predetermined blending proportion so as to have a predetermined specific gravity, said weight being removably attached to said embedding hole of said key body;
- and
- a weight attaching member made of an elastic material in the shape of a sleeve having an inserting hole,
- wherein said weight is fitted into said inserting hole of said weight attaching member, and removably fitted into said embedding hole of said key body through said weight attaching member.
A key comprising:
- a swingable key body formed with an embedding hole;
- and
- a weight fitted in said embedding hole of said key body,
- wherein said weight has a weight attaching member made of heat shrinkable plastic in the shape of a sleeve having a predetermined size, and a weight body made of a predetermined metal material except for lead in the shape of a cylinder having a predetermined size, accommodated in said thermally shrunk weight attaching member in close contact therewith.
A key comprising:
- a swingable key body formed with an embedding hole;
- and
- a weight made of a molded composite material produced by blending a metal except for lead and plastic in a predetermined blending proportion to have a predetermined specific gravity, and embedded in said embedding hole to be attached to said key body,
- wherein said embedding hole is formed in a circular hole, and said weight is formed in the shape of a cylinder which is adapted to be press fitted into said embedding hole, and has a convex element on the outer peripheral face thereof to reduce a frictional resistance when said weight is press fitted into said embedding hole.
A key comprising:
- a swingable key body having a rectangular cross section, extending in the longitudinal direction, and formed with a recess in a front region of the top face thereof and along the same;
- a plate-shaped weight made of a composite material produced by blending a plurality of kinds of materials except for lead having different specific gravities from one another, accommodated in said recess of said key body to impart a weight to said key body;
- and
- a key cover attached on the front region of said key body so as to cover said weight.
A key comprising:
- a swingable key body;
- a sharp key cover having a cavity open to below, and attached on the top face of said key body;
- and
- a weight made of a composite material produced by blending a plurality of kinds of materials except for lead having different specific gravities from one another, and accommodated in said cavity of said sharp key cover to impart a weight to said key body.
Dependencies are inferred from the claim text.