US3746820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure board for the electrical contacts for an electric organ
Assignee: Individual
•
Filing: 1972-02-22
•
Granted: 1973-07-17
•
Expires: 1992-02-22
Abstract
Abstract A pressure board which extends over a plurality of flexible contact members so as to apply a positive pressure at the apex of the contact members to insure a firm contact point for the electrical contacts of a keyboard of an electric organ when the organ keys are depressed.
Inventors
- 👤 D Holder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:43
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/32; G10H1/34; G10H1/344; H; H01; H01H; H01H21/00; H01H21/02; H01H21/18; H01H21/22; G10H2220/00; G10H2220/155; G10H2220/265; G10H2220/275; Y; Y10; Y10S; Y10S84/00; Y10S84/07
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
149 words
A circuit maker and breaker for a depressible pivoted key of a key-board musical instrument, said circuit maker and breaker comprising a first contact piece mounted on one end of said pivoted key, and a flexible contact piece mounted on a support within said instrument with one end thereof secured to said support and the free end thereof contacted by said first contact piece carried by said depressible key when said key is depressed, said flexible contact piece comprising a wire element wherein one plane thereof is above the plane of the ends of said flexible contact piece, a bar extending over all of said flexible contact pieces and contacting the area thereof which is above the plane of the ends of said flexible contact piece, said bar exerting a downward pressure on said flexible contact piece to increase the contact forces between said fixed and flexible contact pieces.
Claim 2
Dependent Claim
149 words
A circuit maker and breaker for a depressible pivoted key of a key-board musical instrument, said circuit maker and breaker comprising a first contact piece mounted on one end of said pivoted key, and a flexible contact piece mounted on a support within said instrument with one end thereof secured to said support and the free end thereof contacted by said first contact piece carried by said depressible key when said key is depressed, said flexible contact piece comprising a wire element wherein one plane thereof is above the plane of the ends of said flexible contact piece, a bar extending over all of said flexible contact pieces and contacting the area thereof which is above the plane of the ends of said flexible contact piece, said bar exerting a downward pressure on said flexible contact piece to increase the contact forces between said fixed and flexible contact pieces.
Claim 3
Dependent Claim
20 words
The structure recited in claim 1 wherein an adjustable spacer means extends between said pressure plate and said insulating board.
Claim 4
Dependent Claim
20 words
The structure recited in claim 1 wherein the tension applied to said end of said first contact member is adjustable.
Claim 5
Dependent Claim
16 words
The structure recited in claim 2 wherein the spacer means comprises a plurality of apertured discs.
References Cited (Backward Citations)
US3657459A
Cited
US3657460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |