US3074368A - Retractable twin keel - Google Patents

Retractable twin keel Download PDF

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Publication number
US3074368A
US3074368A US96441A US9644161A US3074368A US 3074368 A US3074368 A US 3074368A US 96441 A US96441 A US 96441A US 9644161 A US9644161 A US 9644161A US 3074368 A US3074368 A US 3074368A
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Prior art keywords
boat
keel
retractable
twin
trailer
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Expired - Lifetime
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US96441A
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Floyd R Wade
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B41/00—Drop keels, e.g. centre boards or side boards ; Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels

Definitions

  • the present invention relates to sail boats and in particular to a retractable twin keel.
  • An object of the present invention is to provide a keel structured for a sail boat which permits hauling of the sail boat in an upright condition on a fiat bed trailer.
  • Another object is to provide a twin keel for a sail boat so as to improve the stability of the boat.
  • FIG. 1 is a side elevational view of a flat bed trailer with a sailboat supported thereon, the boat being equipped with the twin keel of the present invention
  • FIG. 2 is a perspective view of the keels, removed from the boat of FIG. 1, and in retracted condition, and
  • FIG. 3 is a perspective view of the keels in extended condition.
  • the numeral designates a trailer, preferably having a solid flat bed, although any other structure may be found suitable.
  • the double or twin keel structure serves to support the boat 39 in an upright condition on the trailer 10.
  • Each keel 29 consists in a metal frame 22 which may be bolted to the bottom of the boat 30.
  • Each frame 22 has an upturned rear end 31 adapted to the contour of the stern of a boat. The purpose of this upturned end being, of course, to prevent any boat placed on the frames from slipping on the same when it is being towed on a trailer.
  • a link plate 24 connects each frame 22 to the keel plate 26 which, When the boat 30 is in the water depends below, as in FIG. 3, and stabilizes the boat in the well known manner of all keel, either fixed or retractable.
  • the frames 22 are arranged in lateral spaced relation and are adapted to be secured to the under side of the boat by conventional means.
  • the double keel structure permits loading of the trailer by a single person and with ease and facility, and when extended below the boat affords greater stability to the boat.
  • a retractable twin keel of the character described comprising a pair of frames secured to the bottom of a boat in lateral and parallel spaced relation to each other, each of the said frames being rectangular in both cross section and top plan form and each one of which embodies an upturned rear end conforming to the contour of the stern of said boat and the front end of each one of the said frames formed into a downwardly extending portion having the side plan form of an equilateral triangle near the apex of which is pivotally secured one end of a link plate which has its other end pivotally secured to a portion of a rectangular keel plate which when retracted will have one of its long edges supporting the underside of a portion of that frame to which it is pivotally attached while the other long edge of the said keel plate which is parallel to the first stated edge is adapted to rest on the upper surface of the flatbed of a trailer.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Golf Clubs (AREA)

Description

Jan. 22, -1 963 F. R. WADE RETRACTABLE TWIN KEEL Filed March 17, 1961 INVENTOR 3,074,368 RETRACTABLE TWEQ KEEL Floyd R. Wade, 6224 Tourraine Drive, Newark, Calif. Filed Mar. 17, 1961, Ser. No. 96,441 1 Claim. (Cl. 114-141) The present invention relates to sail boats and in particular to a retractable twin keel.
An object of the present invention is to provide a keel structured for a sail boat which permits hauling of the sail boat in an upright condition on a fiat bed trailer.
Another object is to provide a twin keel for a sail boat so as to improve the stability of the boat.
These and other objects Will be understood from the following description when considered with the attached drawing, in which:
FIG. 1 is a side elevational view of a flat bed trailer with a sailboat supported thereon, the boat being equipped with the twin keel of the present invention,
FIG. 2 is a perspective view of the keels, removed from the boat of FIG. 1, and in retracted condition, and
FIG. 3 is a perspective view of the keels in extended condition.
With reference to the drawing, the numeral designates a trailer, preferably having a solid flat bed, although any other structure may be found suitable.
The double or twin keel structure, as at 20 in FIG. 1, serves to support the boat 39 in an upright condition on the trailer 10.
Each keel 29 consists in a metal frame 22 which may be bolted to the bottom of the boat 30. Each frame 22 has an upturned rear end 31 adapted to the contour of the stern of a boat. The purpose of this upturned end being, of course, to prevent any boat placed on the frames from slipping on the same when it is being towed on a trailer. A link plate 24 connects each frame 22 to the keel plate 26 which, When the boat 30 is in the water depends below, as in FIG. 3, and stabilizes the boat in the well known manner of all keel, either fixed or retractable. The frames 22 are arranged in lateral spaced relation and are adapted to be secured to the under side of the boat by conventional means.
As will be obvious to one skilled in the art, the double keel structure permits loading of the trailer by a single person and with ease and facility, and when extended below the boat affords greater stability to the boat.
While only a preferred form of the invention is shown and described other embodiments are contemplated and numerous changes and modifications may be made in the invention Without departing from the spirit of the invention as set forth in the appended claim.
What is clairned is:
A retractable twin keel of the character described, comprising a pair of frames secured to the bottom of a boat in lateral and parallel spaced relation to each other, each of the said frames being rectangular in both cross section and top plan form and each one of which embodies an upturned rear end conforming to the contour of the stern of said boat and the front end of each one of the said frames formed into a downwardly extending portion having the side plan form of an equilateral triangle near the apex of which is pivotally secured one end of a link plate which has its other end pivotally secured to a portion of a rectangular keel plate which when retracted will have one of its long edges supporting the underside of a portion of that frame to which it is pivotally attached while the other long edge of the said keel plate which is parallel to the first stated edge is adapted to rest on the upper surface of the flatbed of a trailer.
References Qited in the file of this patent UNITED STATES PATENTS 498,082 Pigott May 23, 1893 604,930 Doucet May 31, 1898 2,477,425 Seaholm July 26, 1949 2,521,212 Geisler Sept. 5, 1950 FOREIGN PATENTS 1,547 Great Britain of 1871 7,312 Great Britain of 1888 1,282 Great Britain of 1913 373,892 Germany Apr. 17, 1923 925,219 France Mar. 24, 1947
US96441A 1961-03-17 1961-03-17 Retractable twin keel Expired - Lifetime US3074368A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698606A1 (en) * 1992-11-30 1994-06-03 Beneteau Chantiers Yacht with twin aerodynamic section drop keels - has keels retractable by power to form twin bilge keels
US20070000422A1 (en) * 2005-07-01 2007-01-04 Gianfranco Bianchi Finkeel for boats with foldable leeboards
WO2009141597A1 (en) * 2008-05-17 2009-11-26 William Harold Vernon Steynor Retractable keels for boats

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US498082A (en) * 1893-05-23 Centerboard
US604930A (en) * 1898-05-31 Sail-controlled keel
GB191301282A (en) * 1913-01-16 1914-01-15 Canaan De Cazen Improvements in Boats.
DE373892C (en) * 1923-04-17 Carl Schwarz Sailboat with sliding mast
FR925219A (en) * 1946-04-04 1947-08-28 Center fin for sailboats and all boats with auxiliary sails
US2477425A (en) * 1945-10-29 1949-07-26 Casimir D Seaholm Lifeboat
US2521212A (en) * 1948-10-23 1950-09-05 Herbert A Geisler Detachable sailing keel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US498082A (en) * 1893-05-23 Centerboard
US604930A (en) * 1898-05-31 Sail-controlled keel
DE373892C (en) * 1923-04-17 Carl Schwarz Sailboat with sliding mast
GB191301282A (en) * 1913-01-16 1914-01-15 Canaan De Cazen Improvements in Boats.
US2477425A (en) * 1945-10-29 1949-07-26 Casimir D Seaholm Lifeboat
FR925219A (en) * 1946-04-04 1947-08-28 Center fin for sailboats and all boats with auxiliary sails
US2521212A (en) * 1948-10-23 1950-09-05 Herbert A Geisler Detachable sailing keel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698606A1 (en) * 1992-11-30 1994-06-03 Beneteau Chantiers Yacht with twin aerodynamic section drop keels - has keels retractable by power to form twin bilge keels
US20070000422A1 (en) * 2005-07-01 2007-01-04 Gianfranco Bianchi Finkeel for boats with foldable leeboards
WO2009141597A1 (en) * 2008-05-17 2009-11-26 William Harold Vernon Steynor Retractable keels for boats
GB2472561A (en) * 2008-05-17 2011-02-09 William Harold Vernon Steynor Retractable keels for boats
GB2472561B (en) * 2008-05-17 2012-08-15 William Harold Vernon Steynor Retractable keels for boats

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