Patent US4993305A successfully refreshed from Google Patents.
US4993305A
Expired / Lapsed
US
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Manual with piano effect for use in electronic organs
Assignee: Wersi GmbH and Co
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Filing: 1990-02-23
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Granted: 1991-02-19
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Expires: 2010-02-23
Abstract
Abstract The actions of a manual with piano effect for use in electronic organs have keys which are pivotable about a first horizontal axis and carry rigid or elastic pushers abutting plate-like motion receiving portions on the first arms of discrete reaction levers. The second arm of each lever carries a weight which urges the motion receiving portion of the first arm against a pad at the adjacent end of the pusher. The distance of the point of contact between the pusher and the first arm of the reaction lever from the respective key in idle posotion of the key is greater than the distance of the key from the pivot axis of the reaction lever. This renders it possible to ensure that the resistance of the reaction lever to further depression of the respective key decreases in response to pivoting of the key through a predetermined angle from its idle position. The pusher engages only the first arm of the respective reaction lever and is fixedly secured to the respective key.
Inventors
- 👤 Reinhard Franz
- 👤 Walfried Dost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:40
CPC Classifications
G; G10; G10C; G10C3/00; G10C3/12; G10H; G10H1/00; G10H1/32; G10H1/34; G10H1/344; G10H1/346
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
141 words
A manual with piano effect for use in musical instruments, comprising an action including a key pivotable about a first axis between an idle position and a depressed position; a reaction member pivotable about a second axis which is spaced apart from said key, said member having an arm including a motion receiving portion; and a pusher fixedly secured to said key and having a motion transmitting end arranged to contact only said motion receiving portion so as to pivot said member from a first to a second position in response to pivoting of said key from said idle position to said depressed position, said end of said pusher contacting said portion of said arm at a first distance from said key and said key being disposed at a lesser second distance from said second axis in the idle position thereof.
Claim 2
Dependent Claim
141 words
A manual with piano effect for use in musical instruments, comprising an action including a key pivotable about a first axis between an idle position and a depressed position; a reaction member pivotable about a second axis which is spaced apart from said key, said member having an arm including a motion receiving portion; and a pusher fixedly secured to said key and having a motion transmitting end arranged to contact only said motion receiving portion so as to pivot said member from a first to a second position in response to pivoting of said key from said idle position to said depressed position, said end of said pusher contacting said portion of said arm at a first distance from said key and said key being disposed at a lesser second distance from said second axis in the idle position thereof.
Claim 3
Dependent Claim
29 words
The manual of claim 1, wherein said reaction member has means for maintaining said motion receiving portion in substantially uninterrupted contact with said motion transmitting end of said pusher.
Claim 4
Dependent Claim
54 words
The manual of claim 1, wherein said motion receiving portion has two facets and a ridge disposed between said facets and being substantially parallel to said second axis, said motion transmitting end contacting one of said facets in the idle position and the other of said facets in the depressed position of said key.
Claim 5
Dependent Claim
15 words
The manual of claim 3, wherein at least one of said facets is substantially flat.
Claim 6
Dependent Claim
14 words
The manual of claim 3, wherein at least one of said facets is convex.
Claim 7
Dependent Claim
13 words
The manual of claim 3, wherein said facets make a large obtuse angle.
Claim 8
Dependent Claim
26 words
The manual of claim 3, wherein one of said facets is nearer to and the other of said facets is more distant from said second axis.
Claim 9
Dependent Claim
22 words
The manual of claim 7, wherein said motion transmitting end contacts said more distant facet in the depressed position of said key.
Claim 10
Dependent Claim
25 words
The manual of claim 1, wherein said motion receiving portion has a single substantially convex facet which is contacted by the end of said pusher.
Claim 11
Dependent Claim
23 words
The manual of claim 1, further comprising means for changing the positions of said pusher and said second axis relative to each other.
Claim 12
Dependent Claim
46 words
The manual of claim 10, wherein said pusher has a longitudinal axis which is spaced apart from and is substantially normal to said second axis, said means for changing including means for varying the distance of said second axis and said longitudinal axis from each other.
Claim 13
Dependent Claim
49 words
The manual of claim 11, further comprising a second key, a second pusher fixedly secured to said second key and a second reaction member pivotable by said second pusher, said means for changing including means for simultaneously varying the distance of the second axes from the respective longitudinal axes.
Claim 14
Dependent Claim
28 words
The manual of claim 11, wherein said pusher is elastic and said means for varying comprises an eccentric arranged to flex said pusher relative to said second axis.
Claim 15
Dependent Claim
30 words
The manual of claim 11, wherein said pusher is elastic and said means for varying comprises a reciprocable element arranged to flex said elastic pusher relative to said second axis.
Claim 16
Dependent Claim
10 words
The manual of claim 1, wherein said pusher is elastic.
Claim 17
Dependent Claim
13 words
The manual of claim 13, wherein said pusher includes a metallic leaf spring.
Claim 18
Dependent Claim
43 words
The manual of claim 1, further comprising a shaft which defines said second axis, a bearing for said shaft, and means for moving said bearing between a plurality of positions to thereby change the position of said second axis relative to said pusher.
Claim 19
Dependent Claim
49 words
The manual of claim 1, wherein said arm further comprises a platform and said motion receiving portion includes an elastically deformable panel having a first section overlying said platform and an unsupported second section, said motion transmitting end engaging said first section in the idle position of said key.
Claim 20
Dependent Claim
20 words
The manual of claim 18, wherein at least one of said sections is disposed substantially radially of said second axis.
Claim 21
Dependent Claim
26 words
The manual of claim 1, wherein said arm further comprises a platform and at least the major part of said motion receiving portion abuts said platform.
Claim 22
Dependent Claim
14 words
The manual of claim 1, further comprising vibration damping means for said reaction member.
Claim 23
Dependent Claim
20 words
The manual of claim 21, wherein said vibration damping means comprises a friction generating device which engages said reaction member.
Claim 24
Dependent Claim
21 words
The manual of claim 22, wherein said friction generating device includes a stressed leaf spring which bears upon said reaction member.
Claim 25
Dependent Claim
34 words
The manual of claim 22, wherein said reaction member comprises a surface having a center of curvature at or on said second axis, said friction generating device engaging said surface of said reaction member.
Claim 26
Dependent Claim
44 words
The manual of claim 1, wherein said motion receiving portion has a first surface and said motion transmitting end has a second surface abutting said first surface, one of said surfaces being smooth and the other of said surfaces being defined by a cushion.
Claim 27
Dependent Claim
22 words
The manual of claim 25, wherein said motion transmitting end has a socket and said cushion has a portion in said socket.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |