US4488472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard musical instrument
Assignee: Nippon Gakki Co Ltd
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Filing: 1982-04-16
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Granted: 1984-12-18
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Expires: 2002-04-16
Abstract
Abstract A keyboard musical instrument includes a plurality of keys mounted on a casing in juxtaposed relation. Each of the keys has a retaining portion engageable with a key stop portion on the casing to limit the upward movement of the key. A resilient leaf is formed integral with each key and extends rearwardly therefrom. The resilient leaf nomally urges each key into its raised position. The resilient leaf has an engaging section at its rear portion. The engaging section is detachably retained in a retaining groove formed on the casing. A guide surface is formed on the casing immediately adjacent to and forwardly of the retaining groove for facilitating the insertion of the engaging section into the retaining groove.
Inventors
- 👤 Shinji Kumano
- 👤 Masao Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:36
CPC Classifications
G; G10; G10C; G10C3/00; G10C3/12; G10H; G10H1/00; G10H1/32
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A keyboard musical instrument which comprises: (a) a casing having a retaining groove and a key stop portion; (b) a plurality of juxtaposed keys mounted on said casing for movement between raised and lowered positions, each key having a retaining portion engageable with said key stop portion to limit the upward movement of said key; (c) a resilient leaf formed integral with each key and extending rearwardly therefrom, said resilient leaf normally urging each key into its raised position, said resilient leaf having an engaging section at its rear portion, and said engaging section being detachably retained in said retaining groove; and (d) guide means formed on said casing immediately adjacent to and forward of said retaining groove, said engaging section being insertable into said retaining groove by first being engaged with said guide means and moved rearwardly along said guide means to the end thereof.
Claim 2
Dependent Claim
146 words
A keyboard musical instrument which comprises: (a) a casing having a retaining groove and a key stop portion; (b) a plurality of juxtaposed keys mounted on said casing for movement between raised and lowered positions, each key having a retaining portion engageable with said key stop portion to limit the upward movement of said key; (c) a resilient leaf formed integral with each key and extending rearwardly therefrom, said resilient leaf normally urging each key into its raised position, said resilient leaf having an engaging section at its rear portion, and said engaging section being detachably retained in said retaining groove; and (d) guide means formed on said casing immediately adjacent to and forward of said retaining groove, said engaging section being insertable into said retaining groove by first being engaged with said guide means and moved rearwardly along said guide means to the end thereof.
Claim 3
Dependent Claim
37 words
A keyboard musical instrument according to claim 1, in which said guide means comprises a wedge-shaped projection having an inclined surface for guiding the movement of said engaging section when the latter is introduced into retaining groove.
Claim 4
Dependent Claim
39 words
A keyboard musical instrument according to claim 1, in which a fulcrum portion is formed integral with one of said key and said casing about which fulcrum portion said key is pivotally movable between its raised and lowered positions.
Claim 5
Dependent Claim
144 words
A keyboard musical instrument which comprises: (a) a casing having a retaining groove and a key stop portion; (b) a plurality of juxtaposed keys mounted on said casing for movement between raised and lowered positions, each key having a retaining portion engageable with said key stop portion to limit the upward movement of said key; (c) a resilient leaf formed integral with each key and extending rearwardly therefrom, said resilient leaf normally urging each key into its raised position, said resilient leaf having an engaging section at its rear portion, and said engaging section being detachably retained in said retaining groove; and (d) guide means formed on said casing immediately adjacent to and forward of said retaining groove for facilitating the insertion of said engaging section into said retaining groove; said retaining groove having an upwardly-opening channel-shaped cross-section, said engaging section being directly downwardly.
Claim 6
Dependent Claim
144 words
A keyboard musical instrument which comprises: (a) a casing having a retaining groove and a key stop portion; (b) a plurality of juxtaposed keys mounted on said casing for movement between raised and lowered positions, each key having a retaining portion engageable with said key stop portion to limit the upward movement of said key; (c) a resilient leaf formed integral with each key and extending rearwardly therefrom, said resilient leaf normally urging each key into its raised position, said resilient leaf having an engaging section at its rear portion, and said engaging section being detachably retained in said retaining groove; and (d) guide means formed on said casing immediately adjacent to and forward of said retaining groove for facilitating the insertion of said engaging section into said retaining groove; said retaining groove having an upwardly-opening channel-shaped cross-section, said engaging section being directly downwardly.
Claim 7
Dependent Claim
24 words
A keyboard musical instrument according to claim 1, in which said retaining groove has a downwardly-opening channel-shaped cross-section, said engaging section being directed upwardly.
Claim 8
Dependent Claim
22 words
A keyboard musical instrument according to claim 1, in which said key and said resilient leaf are of a one-piece molded construction.
Claim 9
Dependent Claim
19 words
A keyboard musical instrument according to claim 1, in which said resilient leaf is made of a metal string.
Claim 10
Dependent Claim
36 words
A keyboard musical instrument according to claim 7, in which said engaging sections of said resilient leaves are connected together to form a continuous linear base, said linear base being resiliently deformable along the length thereof.
References Cited (Backward Citations)
US3797357A
Cited
US4129057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |