US4267790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sail furling and reefing apparatus
Assignee: Individual
•
Filing: 1978-04-20
•
Granted: 1981-05-19
•
Expires: 1998-04-20
Abstract
Abstract Apparatus for supporting and furling a sail wherein a hollow mast having a chamber therein is provided with a slot leading into the chamber and a rotatable inner mast in the chamber arranged to bear the weight of the sail in compression. Rotating the inner mast furls the sail. The inner mast is also relatively rigid against torsional bending, its diameter is relatively large. The width of the slot is also relatively large and contoured so that the sail slides freely through the slot even though wrinkled. As a result, the sail can employ adequate fullness, and risk of jamming while furling is minimized.
Inventors
- 👤 Ralph S. Hood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:22
CPC Classifications
B; B63; B63H; B63H9/00; B63H9/04; B63H9/08; B63H9/10; B63H9/1021; B63H9/1035
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
Apparatus for supporting and housing a sail comprising a substantially vertical stayed mast, walls forming a chamber in said mast and a rear facing slot leading from the outside into said chamber, a hollow cylindrical member in said chamber having an outside diameter greater than the width of said slot, means connecting said sail to said cylindrical member and supporting the entire weight of said sail, means for rotating said cylindrical member whereby the sail is drawn into said chamber to furl said sail, said cylindrical member being substantially rigid, extending in said chamber the full vertical length of said sail, means supporting the weight of said cylindrical member against downward forces applied thereto by said cylindrical member and the weight of said sail only at the base of said cylindrical member independently of said mast, and means at the top of said chamber for supporting said cylindrical member only against forces applied laterally thereto.
Claim 2
Dependent Claim
155 words
Apparatus for supporting and housing a sail comprising a substantially vertical stayed mast, walls forming a chamber in said mast and a rear facing slot leading from the outside into said chamber, a hollow cylindrical member in said chamber having an outside diameter greater than the width of said slot, means connecting said sail to said cylindrical member and supporting the entire weight of said sail, means for rotating said cylindrical member whereby the sail is drawn into said chamber to furl said sail, said cylindrical member being substantially rigid, extending in said chamber the full vertical length of said sail, means supporting the weight of said cylindrical member against downward forces applied thereto by said cylindrical member and the weight of said sail only at the base of said cylindrical member independently of said mast, and means at the top of said chamber for supporting said cylindrical member only against forces applied laterally thereto.
Claim 3
Dependent Claim
19 words
The apparatus defined in claim 1 further characterized by said cylindrical member comprising interlocking sections fixed against rotation therebetween.
Claim 4
Dependent Claim
19 words
The apparatus defined in claim 2 further characterized by walls forming a sail holding slot in said interlocking sections.
Claim 5
Dependent Claim
38 words
The apparatus defined in claim 1 further characterized by said means at the top of said chamber comprising a recess and the top of said cylindrical member fitting therein when said sail is in the fully hoisted position.
Claim 6
Dependent Claim
43 words
The apparatus defined in claim 4 further characterized by the axis of said recess being positioned substantially forward of said slot whereby the top of said cylindrical member is held substantially forward of said slot when it is fully lodged in said recess.
Claim 7
Dependent Claim
19 words
The apparatus defined in claim 1 further characterized by walls forming a sail holding slot in said cylindrical member.
Claim 8
Dependent Claim
50 words
The apparatus defined in claim 6 further characterized by a halyard, a halyard sheave at the top of said cylindrical member and means for sliding said sail longitudinally of said cylindrical member, whereby said sail can be hoisted up and down in the conventional manner while in the unfurled condition.
References Cited (Backward Citations)
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US4116152A
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Cited
US4149482A
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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) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |