US3948199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular metal mast for the rigging of a sailing boat
Assignee: Individual
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Filing: 1974-05-10
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Granted: 1976-04-06
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Expires: 1994-05-10
Abstract
Abstract The invention relates generally to masts for the rigging of sailing boats, such as for example centerboard boats of the "FINN" series, and is directed to the problem of increasing the elasticity of known masts of wood or tubular metal. A mast according to the invention is provided with a longitudinal slot, the lips of which may be brought to face each other and are fixed together in places in a non-continuous manner. By this means the mast is given a substantial capacity for elastic torsion, resulting in improvement in its performance.
Inventors
- 👤 Gilbert Lamboley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:07
CPC Classifications
B; B63; B63B; B63B15/00; B63B15/0083
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A tubular mast for the rigging of a sailing boat, said mast being formed of sheet metal bent to a tubular shape with edges of the metal sheet generally defining a line of separation in said mast extending at least along portions of the height thereof, said line of separation extending in a longitudinal plane through said mast and facilitating torsional flexibility in said mast, said mast having a base and a head, fastening means securing together the edges of said metal sheet at selected spaced intervals only for controlling said torsional flexibility with said torsional flexibility being greater at said base and said head than in a central part of said mast, at least certain of said fastening means being of the readily removable and addable type facilitating a rapid change in said torsional flexibility.
Claim 2
Dependent Claim
136 words
A tubular mast for the rigging of a sailing boat, said mast being formed of sheet metal bent to a tubular shape with edges of the metal sheet generally defining a line of separation in said mast extending at least along portions of the height thereof, said line of separation extending in a longitudinal plane through said mast and facilitating torsional flexibility in said mast, said mast having a base and a head, fastening means securing together the edges of said metal sheet at selected spaced intervals only for controlling said torsional flexibility with said torsional flexibility being greater at said base and said head than in a central part of said mast, at least certain of said fastening means being of the readily removable and addable type facilitating a rapid change in said torsional flexibility.
Claim 3
Dependent Claim
17 words
The mast of claim 1 wherein said mast has a major axis transversely of said longitudinal plane.
Claim 4
Dependent Claim
37 words
The mast of claim 1 wherein said line of separation is defined by a pair of lips disposed in adjacent parallel relation on opposite sides of said longitudinal plane, and said fastening means extend between said lips.
Claim 5
Dependent Claim
26 words
The mast of claim 1 wherein said mast includes a base and a head and said mast tapers in section from said base to said head.
Claim 6
Dependent Claim
23 words
The mast of claim 1 wherein said mast carries generally in said central plane a vertically extending dead sheave for a sail bolt-rope.
Claim 7
Dependent Claim
39 words
The mast of claim 5 wherein said dead sheave is disposed immediately adjacent said line of separation and includes a pair of adjacent mounting flanges, and said fastening means directly interconnect said metal sheet edges and said mounting flanges.
Claim 8
Dependent Claim
22 words
The mast of claim 6 wherein said dead sheave is of an omega-shaped cross section and is disposed wholly within said mast.
Claim 9
Dependent Claim
36 words
The mast of claim 6 wherein said dead sheave includes a gutter portion disposed externally of said mast and a generally T-shaped mounting part having a portion extending into said mast through said line of separation.
Claim 10
Dependent Claim
17 words
The mast of claim 5 wherein said dead sheave is disposed remote from said line of separation.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |