EP0272463A1 - Wishbone pour planche à voile - Google Patents

Wishbone pour planche à voile Download PDF

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Publication number
EP0272463A1
EP0272463A1 EP87117195A EP87117195A EP0272463A1 EP 0272463 A1 EP0272463 A1 EP 0272463A1 EP 87117195 A EP87117195 A EP 87117195A EP 87117195 A EP87117195 A EP 87117195A EP 0272463 A1 EP0272463 A1 EP 0272463A1
Authority
EP
European Patent Office
Prior art keywords
boom
mast
line
head
loop
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.)
Withdrawn
Application number
EP87117195A
Other languages
German (de)
English (en)
Inventor
Guy Stewart Mcgregor
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.)
McGregor Garth Bruce
Original Assignee
McGregor Garth Bruce
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by McGregor Garth Bruce filed Critical McGregor Garth Bruce
Publication of EP0272463A1 publication Critical patent/EP0272463A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H8/00—Sail or rigging arrangements specially adapted for water sports boards, e.g. for windsurfing or kitesurfing
    • B63H8/20—Rigging arrangements involving masts, e.g. for windsurfing
    • B63H8/22—Rigging arrangements involving masts, e.g. for windsurfing for connecting wishbones to the mast

Definitions

  • This invention relates to a sail craft boom that finds particular application as a boom for a sailboard.
  • Jib-headed sails for sailing craft are tensioned between the mast and the boom by means of a sail outhaul sheet.
  • the outhaul tension acts between the outhaul of aft end of the boom and the aft side of the mast.
  • the boom is normally secured ahead of the fore end of the mast and the sail outhaul tension is counteracted by means of a coupling which is essentially in tension, and which acts between the aft side of the mast and the fore end or head of the boom.
  • the coupling could be mechanicial of a knotted line coupling.
  • Knotted line couplings are very well known, but it is not always appreciated that, in these couplings, the outhaul tension is applied, through the boom, to the aft side of the mast.
  • a sail craft boom includes a head end and an outhaul end against which a sail outhaul may tension a sail between the mast and the boom, the head end including an bifurcated head which is open towards the front and adapted to extend partially around the mast and to bear against the aft side of the mast, the head including a knotted line coupling and a chock being provided and adapted to fit within and space apart the open legs of the bifurcated head ahead of the mast, the knotted line coupling comprising a loop of line adapted to extend around the mast, the ends of the line being secured to the bifurcations.
  • the boom is preferably a sailboard wishbone boom including a pair of boom arms extending from boom arm roots on either side of the boom head with the legs of the wishbone being connected to one another at the outhaul end of the boom, the loop of line being dimensioned for the line to extend tightly about the chock and the aft ends of the boom arm roots to the points of securement of the loop when the boom is in position on the mast.
  • a sailboard sail 10 has the luff thereof formed with a mast pocket 12 into which a mast 14 is inserted.
  • the tack 16 of the sail is provided with a grommet 18 through which a downhaul sheet 20 draws the sail downwardly against an eye 22 or the like incorporated in the foot of the mast 14.
  • the sail 10 is tensioned between the mast 14 and a boom 24 by means of an outhaul sheet 26 which is secured to the outhaul end 24.1 of the boom and to a grommet 28 in the clew 30 of the sail 10.
  • Conventional sailboard booms counteract this force by securing the boom to the mast by means of a tension coupling which is in forward tension between, essentially, the aft end of the mast and the fore end of the boom.
  • the boom of the invention is provided with a bifurcated pressure coupling head constituted by a substantially U-shaped bracket 38 bearing against the aft side 14.1 of the mast 14.
  • a chock 40 is provided which fits between the open bifurcations 38.1 of the U-shaped bracket 38 for the purpose of spacing apart the bifurcations to the extent necessary to prevent crushing of the mast 14.
  • the chock 40 also serves to transmit the coupling force of the knotted line coupling to the mast 14.
  • both the curved pressure face of the chock 40 and the curved base of the U-shaped bracket 38 have a dissimilar curvature to that of the mast. The reason for this is to ensure point or line pressure against the mast as a further means of preventing damage to the mast 14.
  • the boom arms 24.2 extend from boom arm roots 38.2 on either side of the bifurcations 38.1, which boom arm roots 38.2 are reinforced by means of reinforcing gussets 38.3.
  • the gussets 38.3 serve as points of attachment for a loop of line 42, the free ends of which merely have knots 42.2 formed therein on the fore sides of the gussets 38.3.
  • the line 42 therefore extends in a closed loop which, in use, is drawn around the aft ends of the boom arm roots 38.2 and around the fore end of the chock 40.
  • the boom 24 is retained in position on the mast 14 by a combination of the outhaul tension and a knotted line coupling which can be seen in greater detail in Figures 3 and 4.
  • the loop of line 42 is merely looped forward to extend towards the front of the bracket 38.
  • the mast 14 is now inserted through the closed circle, defined roughly by the U-­shaped bracket and the loop of line 42, with the mast and the boom held substantially parallel to one another.
  • the chock 40 is positioned between the bifurcations 38.1, the line 42 is positioned within the appropriate groove 44 in the chock 40 and the boom arms 24.2 are drawn upwardly to extend at substantially right angles to the mast 14.
  • the line 42 is dimensioned such that this action draws the line around the bottom ends of the arm roots 38.2 and also draws the chock 40 tightly into the bifurcations to clamp the mast 14 within the U-shaped bracket 38.
  • the sail 10 will of course have been positioned on the mast 14 and the downhaul and outhaul sheets 20 and 26 can now be used to secure the sail to the mast and boom, thereby securing the intire assembly.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Catching Or Destruction (AREA)
EP87117195A 1986-11-21 1987-11-21 Wishbone pour planche à voile Withdrawn EP0272463A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA868838 1986-11-21
ZA868838 1986-11-21

Publications (1)

Publication Number Publication Date
EP0272463A1 true EP0272463A1 (fr) 1988-06-29

Family

ID=25578643

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87117195A Withdrawn EP0272463A1 (fr) 1986-11-21 1987-11-21 Wishbone pour planche à voile

Country Status (1)

Country Link
EP (1) EP0272463A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232140A (en) * 1989-05-20 1990-12-05 Peter Stuart Spencer Wishbone boom mast collar for a sailboard
WO1998003394A1 (fr) * 1996-07-23 1998-01-29 Paul Muller Bateau pliant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2445268A1 (fr) * 1978-12-27 1980-07-25 Jolivet Christiane Piece de fixation de wishbone sur le mat d'une planche a voile
EP0139782A1 (fr) * 1983-10-29 1985-05-08 Partanag AG Changement de la surface de voilure d'un dispositif de voilure
DE8606514U1 (de) * 1986-03-10 1986-07-31 Chowaniec, Christian, 5300 Bonn Rigg für ein Segelbrett
WO1987000503A1 (fr) * 1985-07-17 1987-01-29 Bartholin, Niels Bome et tete de bome pour veliplanchiste
EP0213034A1 (fr) * 1985-08-07 1987-03-04 Le Profil Wishbone comportant un embout auto-bloquant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2445268A1 (fr) * 1978-12-27 1980-07-25 Jolivet Christiane Piece de fixation de wishbone sur le mat d'une planche a voile
EP0139782A1 (fr) * 1983-10-29 1985-05-08 Partanag AG Changement de la surface de voilure d'un dispositif de voilure
WO1987000503A1 (fr) * 1985-07-17 1987-01-29 Bartholin, Niels Bome et tete de bome pour veliplanchiste
EP0213034A1 (fr) * 1985-08-07 1987-03-04 Le Profil Wishbone comportant un embout auto-bloquant
DE8606514U1 (de) * 1986-03-10 1986-07-31 Chowaniec, Christian, 5300 Bonn Rigg für ein Segelbrett

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232140A (en) * 1989-05-20 1990-12-05 Peter Stuart Spencer Wishbone boom mast collar for a sailboard
WO1998003394A1 (fr) * 1996-07-23 1998-01-29 Paul Muller Bateau pliant

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19881230