US20070000422A1 - Finkeel for boats with foldable leeboards - Google Patents

Finkeel for boats with foldable leeboards Download PDF

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Publication number
US20070000422A1
US20070000422A1 US11/281,670 US28167005A US2007000422A1 US 20070000422 A1 US20070000422 A1 US 20070000422A1 US 28167005 A US28167005 A US 28167005A US 2007000422 A1 US2007000422 A1 US 2007000422A1
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US
United States
Prior art keywords
finkeel
leeboards
fixed part
elements
hull
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/281,670
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English (en)
Inventor
Gianfranco Bianchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of US20070000422A1 publication Critical patent/US20070000422A1/en
Abandoned legal-status Critical Current

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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 
    • B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
    • B63B43/02—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking
    • B63B43/04—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving stability
    • B63B43/08—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving stability by transfer of solid ballast
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/02—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by displacement of masses
    • 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 invention relates to a finkeel for boats, in particular sailing boats.
  • finkeels have also been designed that are able to swing to the right or left relative to the longitudinal mid-plane of the hull, moving the bulb away from the centre of gravity of the boat and therefore increasing the righting moment, which is the product of the weight of the bulb multiplied by the arm of the weight force (i.e. its distance from the centre of gravity).
  • the finkeel is hinged at the bottom of the hull and is rotated with respect to its hinging axis by means of actuators, according to needs.
  • This type of finkeel is effective as regards righting of the boat, but it has limitations due to the fact that by rotating the finkeel in the manner explained above, the transverse resistance to the leeway of the hull decreases significantly owing to the smaller resisting cross-section of the rotated fin keel, without providing any advantages as regards the draught and therefore the possibility of access to tourist ports.
  • the Applicant of the present application has designed in the past a particular finkeel for boats, described in European patent application EP 1.464.572; the fin of this keel is composed of a fixed part which is solid with the hull, and supports at its end two hinged leeboards that can rotate independently of each other.
  • the technical problem underlying the present invention is therefore that of providing a finkeel with movable leeboards having a greater length, all other conditions being the same, than that of known leeboards, without however causing problems due to of an excessive width in relation to the hull.
  • each leeboard comprises a first element hinged to the fixed part of the finkeel and a second element hinged to the first element, so as to form together a structure which may be folded up in a manner similar to that bird wings.
  • FIGS. 1 and 2 show schematically a perspective view and a stern view of a hull with a finkeel according to the invention, in respective operating conditions;
  • FIGS. 3 and 4 show, respectively, a side and a front view of an embodiment of a finkeel according to the invention
  • FIG. 5 shows a variant of the finkeel in FIGS. 3 and 4 ;
  • FIGS. 6, 7 and 8 show a side view of a further embodiment of the finkeel according to the invention, in respective operating conditions.
  • numeral 1 denotes overall the hull of a boat equipped with a finkeel 2 according to the invention.
  • This finkeel comprises a fixed part 3 integral with the keel of the boat and on which two foldable leeboards 4 and 5 are hinged.
  • the latter are in turn composed of two elements 4 a , 4 b ; 5 a , 5 b which are hinged together and which support at the bottom two ballast bulbs 6 , 7 .
  • the leeboards 4 and 5 may be folded up underneath the hull 1 so as to remain within its maximum width (indicated by broken vertical lines); to this end the finkeel 2 is provided with systems for rotating the upper elements 4 a , 5 a , with respect to their hinging axis X to the fixed part 3 , and the lower elements 4 b , 5 b , with respect to the hinging axis Y to the upper elements.
  • the upper elements 4 a , 5 a are each rotated by a respective gear mechanism which comprises a pinion 10 , 11 and a gearwheel 12 , 13 mounted on a pin 14 , 15 solid with the element 4 a , 5 a.
  • the pinions of the gear mechanisms are actuated by respective motors (not shown in the drawings) or by hydraulic pistons which may advantageously be accommodated in the fixed part 3 of the finkeel 2 .
  • the lower elements 4 b , 5 b of the latter are instead rotated with respect to the upper elements by means of hydraulic cylinders 18 , 19 .
  • the leeboards of the finkeel thus formed are folded up by rotating the upper elements 4 a , 5 a through operation of the gear mechanisms 10 - 13 , and the lower elements 4 b , 5 b , through operation of the hydraulic cylinders 18 , 19 .
  • the hydraulic cylinders 20 , 21 have the function of operating the gear mechanism which moves the—gearwheels 12 and 13 integral with the pins 14 , 15 ; in order to favour the action of the cylinders 20 and 21 , the fixed part 3 of the finkeel has openings where they are advantageously accommodated.
  • FIGS. 6 to 8 show the example of a finkeel where, when it is in the vertical condition of FIG. 6 , the hinging axis Y of the lower elements 4 b , 5 b is perpendicular to the drawing sheet of FIGS. 6-8 and to the hinging axis X of the upper elements 4 a , 5 a.
  • hydraulic cylinders 24 , 25 are used and act in the plane of said elements: before, during or at the end of this operation, the upper elements 4 a , 5 a are rotated with respect to their hinging axis X.
  • FIGS. 7 and 8 show the sequence of these operations for the leeboard 5 of the finkeel; a similar sequence is also performed for the leeboard 4 (although it is not shown in the drawings), the upper element 4 a thereof, however, is rotated about the axis X on the opposite side to the corresponding element of the leeboard 5 , with respect to the vertical mid-plane of the boat defined by the fixed part 3 of the finkeel.
  • this solution also allows folding up of the leeboard 4 and 5 of the finkeel underneath the hull, so as to cause them to retract into its widthwise overall dimensions; differently from before, in this case the hydraulic cylinders 24 , 25 operate in the plane of the lower elements 4 b , 5 b and may therefore be aligned with them, being accommodated inside the upper elements 4 a , 5 a which do not have openings as in the example—of FIG. 5 .
  • the leeboards 4 and 5 of the finkeel 2 may be rotated on the same side with respect to the mid-plane of the boat defined by the fixed part 3 of the finkeel, so as to increase the righting moment, like it occurs in the known fin keels, for example such as that described in patent application EP 1,464,572 in the name of the present applicant.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Table Devices Or Equipment (AREA)
US11/281,670 2005-07-01 2005-11-17 Finkeel for boats with foldable leeboards Abandoned US20070000422A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2005A001253 2005-07-01
IT001253A ITMI20051253A1 (it) 2005-07-01 2005-07-01 Deriva per imbarcazioni con ali ripiegabili

Publications (1)

Publication Number Publication Date
US20070000422A1 true US20070000422A1 (en) 2007-01-04

Family

ID=37110296

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/281,670 Abandoned US20070000422A1 (en) 2005-07-01 2005-11-17 Finkeel for boats with foldable leeboards

Country Status (3)

Country Link
US (1) US20070000422A1 (it)
EP (1) EP1739004A1 (it)
IT (1) ITMI20051253A1 (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009058026A1 (en) * 2007-10-31 2009-05-07 Dag Vilnes Impact absorbing drop keel
US20100116189A1 (en) * 2008-11-13 2010-05-13 Jensen Christian H Sailboat with a canting ballast system
WO2012112990A2 (en) * 2011-02-18 2012-08-23 Baruh Bradford G System and method of adjusting the location and position of the foresail on a sailboat
JP2019141393A (ja) * 2018-02-22 2019-08-29 雅仁 木下 運搬容器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010098726A2 (en) * 2009-02-25 2010-09-02 Grom Tomaz Keel and sailing vessel incorporating same

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US785849A (en) * 1904-05-28 1905-03-28 Charles Albrecht Adjustable keel for ships or boats.
US2437271A (en) * 1946-01-11 1948-03-09 Rice Henry Weston Centerboard installation
US2466006A (en) * 1946-09-13 1949-04-05 George J Danko Adjustable centerboard
US2569270A (en) * 1947-01-15 1951-09-25 Loudon G Wilson Retractable keel for sailboats
US3074368A (en) * 1961-03-17 1963-01-22 Floyd R Wade Retractable twin keel
US3903827A (en) * 1974-07-15 1975-09-09 Paul M Marcil Non-heeling hull assembly
US4044703A (en) * 1976-08-25 1977-08-30 Joel Kurtz Sailboat control apparatus
US4352335A (en) * 1977-09-16 1982-10-05 Sugden Keith C Yacht keels
US5152238A (en) * 1991-08-27 1992-10-06 Page Robert L Split-hinged, winged, self-cradling shallow draft keel for sailing vessel
US5967074A (en) * 1997-01-24 1999-10-19 Frantl; Erich Keel for sail ships

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH388803A (fr) * 1963-07-09 1965-02-28 Routchenko Wladimir Dérive de bateau
DE2514438A1 (de) * 1975-04-02 1976-10-21 Tile Dr Ing Brakebusch Senkkiel fuer segelboote
NL1002990C2 (nl) * 1996-05-02 1997-11-06 Jachtwerf Jongert B V Vaartuig met een volgens het middenlangsvlak daarvan gedeelde kiel.
EP1464572A1 (en) * 2003-04-04 2004-10-06 Gianfranco Bianchi Finkeel for boats, with movable lee-boards

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US785849A (en) * 1904-05-28 1905-03-28 Charles Albrecht Adjustable keel for ships or boats.
US2437271A (en) * 1946-01-11 1948-03-09 Rice Henry Weston Centerboard installation
US2466006A (en) * 1946-09-13 1949-04-05 George J Danko Adjustable centerboard
US2569270A (en) * 1947-01-15 1951-09-25 Loudon G Wilson Retractable keel for sailboats
US3074368A (en) * 1961-03-17 1963-01-22 Floyd R Wade Retractable twin keel
US3903827A (en) * 1974-07-15 1975-09-09 Paul M Marcil Non-heeling hull assembly
US4044703A (en) * 1976-08-25 1977-08-30 Joel Kurtz Sailboat control apparatus
US4352335A (en) * 1977-09-16 1982-10-05 Sugden Keith C Yacht keels
US5152238A (en) * 1991-08-27 1992-10-06 Page Robert L Split-hinged, winged, self-cradling shallow draft keel for sailing vessel
US5967074A (en) * 1997-01-24 1999-10-19 Frantl; Erich Keel for sail ships

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009058026A1 (en) * 2007-10-31 2009-05-07 Dag Vilnes Impact absorbing drop keel
US20100218713A1 (en) * 2007-10-31 2010-09-02 Dag Vilnes Impact absorbing drop keel
US8156880B2 (en) 2007-10-31 2012-04-17 Dag Vilnes Impact absorbing drop keel
US20100116189A1 (en) * 2008-11-13 2010-05-13 Jensen Christian H Sailboat with a canting ballast system
US7784417B2 (en) 2008-11-13 2010-08-31 Jensen Christian H Sailboat with a canting ballast system
WO2012112990A2 (en) * 2011-02-18 2012-08-23 Baruh Bradford G System and method of adjusting the location and position of the foresail on a sailboat
WO2012112990A3 (en) * 2011-02-18 2012-12-27 Baruh Bradford G System and method of adjusting the location and position of the foresail on a sailboat
JP2019141393A (ja) * 2018-02-22 2019-08-29 雅仁 木下 運搬容器

Also Published As

Publication number Publication date
ITMI20051253A1 (it) 2007-01-02
EP1739004A1 (en) 2007-01-03

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