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Patent US4658695A successfully refreshed from Google Patents.
US4658695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-decked keyboard for musical instruments
Assignee: Individual
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Filing: 1985-09-17
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Granted: 1987-04-21
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Expires: 2005-09-17
Abstract
Abstract A multi-decked keyboard for musical instruments has three decks arranged for ease of playing with each hand. The primary deck is substantially a normal piano-like keyboard; the second deck is also substantially a normal piano-like keyboard except that the keys are shortened; and the third deck consists only of shortened white keys. The shortened keys permits a normal hand to reach from the primary to the third decks simultaneously. A specially designed key support system maintains a compact keyboard.
Inventors
- 👤 Douglas A. Cutler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:26
CPC Classifications
G; G10; G10C; G10C3/00; G10C3/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
369 words
Multiple rows of long, straight, consecutively spaced multiple key levers, each of said rows lying horizontally and being positioned one above the other in a parallel manner at a distance from each other that allows for each lever to perform unhindered and independent motions of usual piano-like actuation, a step-like, terraced arrangement of long thin rails acting as motion limiting guides and stops for said arrangement of key levers with said rails being thin enough to be unobtrusively positioned with respect to the motion of actuation of said levers in the horizontal spaces between the levels of said key levers, vertically disposed thin support struts occupying the vertically aligned spaces between vertically corresponding key levers on different rows of levers and acting as bases for said terraced arrangement of long, thin motion limiting guide and stop rails, in combination with a multi-decked musical keyboard that itself combines a substantially normal piano-like primary row of keys, a second row of substantially normal piano-like keys except that the front to back distances of all key surfaces, and in particular the front to back distance of the black key surfaces of said second row of keys, are significantly shortened relative to the front to back distance of said primary row of key surfaces, said second row of keys being positioned in a downward step-like manner immediately in front of said primary row of keys such that when a white key of said primary row of keys is in a completely depressed or actuated position, its upper surface rests on a plane which is extremely close to or immediately level with the plane of the upper surface of the unactuated black keys of said second row of keys, a third row of significantly shortened white keys only positioned in a downward step-like manner directly in front of said second row of keys such that when a white key of said second row of keys is in a completely actuated position its upper surface rests on a plane which is slightly above or level with the plane of the upper surface of an undepressed white key of said third row of keys, and a transducer individually connected to the rearward portion of each lever.
Claim 2
Dependent Claim
369 words
Multiple rows of long, straight, consecutively spaced multiple key levers, each of said rows lying horizontally and being positioned one above the other in a parallel manner at a distance from each other that allows for each lever to perform unhindered and independent motions of usual piano-like actuation, a step-like, terraced arrangement of long thin rails acting as motion limiting guides and stops for said arrangement of key levers with said rails being thin enough to be unobtrusively positioned with respect to the motion of actuation of said levers in the horizontal spaces between the levels of said key levers, vertically disposed thin support struts occupying the vertically aligned spaces between vertically corresponding key levers on different rows of levers and acting as bases for said terraced arrangement of long, thin motion limiting guide and stop rails, in combination with a multi-decked musical keyboard that itself combines a substantially normal piano-like primary row of keys, a second row of substantially normal piano-like keys except that the front to back distances of all key surfaces, and in particular the front to back distance of the black key surfaces of said second row of keys, are significantly shortened relative to the front to back distance of said primary row of key surfaces, said second row of keys being positioned in a downward step-like manner immediately in front of said primary row of keys such that when a white key of said primary row of keys is in a completely depressed or actuated position, its upper surface rests on a plane which is extremely close to or immediately level with the plane of the upper surface of the unactuated black keys of said second row of keys, a third row of significantly shortened white keys only positioned in a downward step-like manner directly in front of said second row of keys such that when a white key of said second row of keys is in a completely actuated position its upper surface rests on a plane which is slightly above or level with the plane of the upper surface of an undepressed white key of said third row of keys, and a transducer individually connected to the rearward portion of each lever.
Claim 3
Dependent Claim
268 words
In a multi-decked musical keyboard, the combination of a substantially normal piano-like primary row of keys, a second row of substantially normal piano-like keys except that the front to back distances of all key surfaces of said second row of keys are significantly shortened relative to the front to back distance of said primary row of key surfaces, said second row of keys being positioned in a downward step-like manner immediately in front of said row of keys such that when a white key of said primary row of keys is in a completely depressed or actuated position, its upper surface rests on a plane which is extremely close to or immediately level with the plane of the upper surface of the unactuated black keys of said second row of keys, a third row of white keys only which are shortened similarly to the white keys of said second row of keys, said third row of keys being positioned in a downward step-like manner directly in front of said second row of keys such that when a white key of said second row of keys is in a completely actuated position, its upper surface rests on a plane which is slightly above or level with the plane of the upper surface of an undepressed white key of said third row of keys, a system of parallel levers connected individually to the key surfaces of said primary, second, and third rows of keys such that completely independent actuation of all key surfaces on all levels is facilitated, and a transducer individually connected to the rearward portion of each lever.
Claim 4
Dependent Claim
268 words
In a multi-decked musical keyboard, the combination of a substantially normal piano-like primary row of keys, a second row of substantially normal piano-like keys except that the front to back distances of all key surfaces of said second row of keys are significantly shortened relative to the front to back distance of said primary row of key surfaces, said second row of keys being positioned in a downward step-like manner immediately in front of said row of keys such that when a white key of said primary row of keys is in a completely depressed or actuated position, its upper surface rests on a plane which is extremely close to or immediately level with the plane of the upper surface of the unactuated black keys of said second row of keys, a third row of white keys only which are shortened similarly to the white keys of said second row of keys, said third row of keys being positioned in a downward step-like manner directly in front of said second row of keys such that when a white key of said second row of keys is in a completely actuated position, its upper surface rests on a plane which is slightly above or level with the plane of the upper surface of an undepressed white key of said third row of keys, a system of parallel levers connected individually to the key surfaces of said primary, second, and third rows of keys such that completely independent actuation of all key surfaces on all levels is facilitated, and a transducer individually connected to the rearward portion of each lever.
Claim 5
Dependent Claim
332 words
Multiple rows of long, straight, consecutively spaced multiple key levers, each of said rows lying horizontally and being positioned one above the other in a parallel manner at a distance from each other that allows for each lever to perform unlinked and independent motions of actuation, a step-like, terraced arrangement of long, thin rails acting as motion limiting guides and stops for said arrangement of key levers with said rails being thin enough to be unobtrusively positioned with respect to the motion of usual piano-like actuation of said levers in the horizontal spaces between the levels of said key levers, in combination with a multi-decked musical keyboard that itself combines a substantially normal piano-like primary row of keys, a second row of substantially normal piano-like keys except that the front to back distances of all key surfaces, and in particular the front to back distance of the black key surfaces of said second row of keys, are significantly shortened relative to the front to back distance of said primary row of key surfaces, said second row of keys being positioned in a downward step-like manner immediately in front of said primary row of keys such that when a white key of said primary row of keys is in a completely depressed or actuated position, its upper surface rests on a plane which is extremely close to or immediately level with the plane of the upper surface of the unactuated black keys of said second row of keys, a third row of significantly shortened white keys only positioned in a downward step-like manner directly in front of said second row of keys such that when a white key of said second row of keys is in a completely actuated position, its upper surface rests on a plane which is slightly above or level with the plane of the upper surface of an undepressed white key of said third row of keys, and a transducer individually connected to the rearward portion of each lever.
Claim 6
Dependent Claim
332 words
Multiple rows of long, straight, consecutively spaced multiple key levers, each of said rows lying horizontally and being positioned one above the other in a parallel manner at a distance from each other that allows for each lever to perform unlinked and independent motions of actuation, a step-like, terraced arrangement of long, thin rails acting as motion limiting guides and stops for said arrangement of key levers with said rails being thin enough to be unobtrusively positioned with respect to the motion of usual piano-like actuation of said levers in the horizontal spaces between the levels of said key levers, in combination with a multi-decked musical keyboard that itself combines a substantially normal piano-like primary row of keys, a second row of substantially normal piano-like keys except that the front to back distances of all key surfaces, and in particular the front to back distance of the black key surfaces of said second row of keys, are significantly shortened relative to the front to back distance of said primary row of key surfaces, said second row of keys being positioned in a downward step-like manner immediately in front of said primary row of keys such that when a white key of said primary row of keys is in a completely depressed or actuated position, its upper surface rests on a plane which is extremely close to or immediately level with the plane of the upper surface of the unactuated black keys of said second row of keys, a third row of significantly shortened white keys only positioned in a downward step-like manner directly in front of said second row of keys such that when a white key of said second row of keys is in a completely actuated position, its upper surface rests on a plane which is slightly above or level with the plane of the upper surface of an undepressed white key of said third row of keys, and a transducer individually connected to the rearward portion of each lever.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |