Patent US3763703A successfully refreshed from Google Patents.
US3763703A
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Apparatus for trimming sails
Assignee: Individual
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Filing: 1972-03-10
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Granted: 1973-10-09
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Expires: 1992-03-10
Abstract
Abstract A pressure-sensitive device is provided for aiding a sail-boat skipper in trimming a sail for maximum efficiency and speed. The device includes air-pressure sensors located on opposite sides of the sail and means for comparing the pressures so that the sail may be trimmed to provide a maximum pressure differential. In one embodiment the sensors are a pair of static tubes, each having one end operatively associated with one side of the sail and the other end in communication with a housing having a flexible diaphragm which moves in response to change in the difference in air pressure on opposite sides of the sail. The diaphragm is coupled to a dial-type indicator for indicating these changes.
Inventors
- 👤 J Man
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:18
CPC Classifications
B; B63; B63H; B63H9/00; B63H9/04; B63H9/08; B63H9/10; B63H9/06; B63H9/067; G; G01; G01P; G01P5/00; G01P5/14; B63B; B63B49/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
118 words
In combination with the main sail of a sail-boat the improvement which comprises a first static port means positioned on one face of the sail at substantially the center of pressure thereof, a second static port means positioned on the other opposite face of the sail, the said port means being substantially opposite one another to sense the respective static air pressures existing on both sides of the center of pressure, a device for translating the respective pressures into intelligence representing the respective air pressures, differential means responsive to said difference in air pressures and presenting the same as a measure of the trim of the sail and means providing communication between said port means and differential means.
Claim 2
Dependent Claim
118 words
In combination with the main sail of a sail-boat the improvement which comprises a first static port means positioned on one face of the sail at substantially the center of pressure thereof, a second static port means positioned on the other opposite face of the sail, the said port means being substantially opposite one another to sense the respective static air pressures existing on both sides of the center of pressure, a device for translating the respective pressures into intelligence representing the respective air pressures, differential means responsive to said difference in air pressures and presenting the same as a measure of the trim of the sail and means providing communication between said port means and differential means.
Claim 3
Dependent Claim
18 words
The combination in accordance with claim 1 wherein the port means open downwardly to preclude entry of water.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |