EP0246078A1 - Gabelbaumende für Segelbretter - Google Patents

Gabelbaumende für Segelbretter Download PDF

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Publication number
EP0246078A1
EP0246078A1 EP87304232A EP87304232A EP0246078A1 EP 0246078 A1 EP0246078 A1 EP 0246078A1 EP 87304232 A EP87304232 A EP 87304232A EP 87304232 A EP87304232 A EP 87304232A EP 0246078 A1 EP0246078 A1 EP 0246078A1
Authority
EP
European Patent Office
Prior art keywords
handle
mast
limbs
boom
sailboard
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Withdrawn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
EP87304232A
Other languages
English (en)
French (fr)
Inventor
Max Dickison
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.)
TYRONSEA PLASTICS Pty Ltd
Original Assignee
TYRONSEA PLASTICS Pty Ltd
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 TYRONSEA PLASTICS Pty Ltd filed Critical TYRONSEA PLASTICS Pty Ltd
Publication of EP0246078A1 publication Critical patent/EP0246078A1/de
Withdrawn legal-status Critical Current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 the front boom end for a sailboard.
  • the mast supports a boom (for pivotal movement of the rig) near the lower end of the mast, the boom comprising two boom side assemblies which are joined at their front ends by the front boom end and at their rear ends by the rear boom end, the two boom side assemblies being located on opposite sides of the sail.
  • the boom comprises a hand grip for the user.
  • the mast should be very light in weight, so that it is buoyant when the board lies with the sail on the water so that the board is not completely capsized. For this reason the mast is normally constructed in a hollow for­mation with very thin walls, and these walls are easily damaged when excessive forces are applied.
  • the usual arrangement for the sailboard front boom end is for a rope to be attached to the upper end of the boom end, and for the boom to be moved up and down the mast, but to be tightened against the mast by levering the boom down­wardly against its upper edge as a fulcrum point, and this in turn applies tension to the rope. Since there can be maladjustment of the rope, it is possible to crush or indent the thin mast wall, and one of the main objects of this invention is to provide means whereby such damage will not occur.
  • a second problem is sometimes encountered by people who are not conversant with ropes and knots if they use a rope system for attachment of a front boom end to a sail board mast, in that they have difficulty in making the attachment without danger of damaging the mast, and a second object of the invention is to provide a simple system which is easily adjusted.
  • the front boom end for the attach­ment of a boom to the mast of a sailboard comprises a pair of limbs which diverge rearwardly, each of the limbs having a tubular end to receive the front end of a boom member of a sailboard boom.
  • a curved flange connects the limbs and has a rearwardly facing mast engaging surface.
  • the curved flange adjacent one of the limbs comprises a web which defines a hook.
  • a handle has a bifurcate end the limbs of which straddle the boom end and are connected to the boom end by means of a pivot pin, and a loop of rope which is positioned through a hole in the handle, when looped over the hook, may be tensioned around the sailboard mast by the handle.
  • the handle can be semi-circular in cross-section so that it overlies a limb of the boom end when closed, but can be made so short that the physical force applicable thereto by a user is insufficient to crush a mast.
  • the invention consists of a body with a pair of limbs which diverge rearwardly, each of the limbs having a tubular end of dimension to receive the front end of a respective boom member, a curved flange connecting the limbs and having a rearwardly facing mast-engaging surface, a web defining a hook between one of the limbs and a convex surface of the curved flange, a handle, pivot means pivoting the handle to the body, and a loop of line between the handle and the body, which, upon being extended around the sailboard mast, is positionable in the hook and tensioned upon movement of the handle.
  • the handle is provided with a wedge shaped slot through which a rope end is passed, the rope end having a "tail" which can be moved into or out of the wedge shaped slot in such a way that the length of the loop is decreased or increased, and that closure of the handle will merely apply additional tension.
  • FIG. 1 shows, in perspective, a front boom assembly 10, comprising a body 11, a handle 12, and a loop of rope 13.
  • Material other than rope can be used, for example stainless steel wire.
  • the boom end body 11 comprises a pair of limbs 15 and 16 and these diverge rearwardly with an included angle of 90° (FIG. 3).
  • the limbs 15 and 16 are hollow to receive the forward ends of the boom portions (not shown) of respective boom side assemblies.
  • a curved flange 18 is monolithic with the limbs 15 and 16, and faces rearwardly, the curvature of the concave surface, being complementary to a mast sur­face.
  • the maximum height 'H' of this flange 18 is such that pressure exerted by the fitting to the mast of a sailboard is spread over a large area so that inadvertent crushing of the mast due to wind or tightening forces is avoided.
  • One side of the convex surface of the curved flange 18 is provided with a web 19 defining a hook 20 as shown in the plan view (FIG. 3) and the central portion of the body portion 11 is provided with an aperture 21 for receiving a pivot pin 22 as shown in FIGS. 3 and 5.
  • Aperture 23 receives an end of an up-haul rope (not shown).
  • Handle 12 which is shown in plan in FIG. 6 and in underside view of FIG. 7 has a pair of wings 26 which define a bifurcate end.
  • the wings 26 straddle the central part of the boom end body 11, and are connected thereto by the aforesaid pin 22 for swivelling of the handle.
  • the handle 12 is also provided with aligned circular rope apertures 27 through respective limbs 26, and in one of the wings 26 there is additionally provided a wedge shaped slot 28 which receives the tail of a loop of rope 13, the loop being secured at its other end to the handle through one of the rope apertures 27.
  • the rope loop 13 releasably engages in hook 20, and can have an initial tension applied by merely pulling the loop after it has been engaged over the hook, the wedging the rope tail in the wedge shaped slot 28. This is done while the handle is "open", but pivotal movement of the handle about its pivot pin 22 will cause additional tension which will be taken up by the resilience of the front boom end itself, handle, pin, and rope, and the handle will move to an "over centre” position where it locks against accidental release.
  • the amount of pressure applied by squeezing the band is small; with this arrangement the danger of damage to the mast is considerably reduced, and the tension which is applied is arranged to be such that the pressure between the front boom end and the mast is relatively small.
  • a friction pad 30 is secured to one side of flange 18, to reduce tendency for the boom end assembly 10 to slide over the mast of a sailboard.
  • the rope which is used can be conveniently of the same cross-sectional dimension as rope otherwise used, and is readily available. If, for example, a toothed band were used as in prior art tensioning devices, the tension would not be infinitely adjustable, as in the case with the rope. If a toothed band breaks or is damaged it is necessary to have another toothed band as a replacement and this may not be readily available, but replacement rope is usually available. As said before, it is desirable that the weight should be sufficiently small that the mast and boom are buoyant, and the arrangement is so simple that it can be made lightweight. The attachment is extremely easy, simply looping the loop of rope over the hook, and adjustment of the boom up and down the mast is also very simple, merely requiring the release of the handle while adjustment is made.
  • mast/boom connection system is very simple operable.
  • the operator need not be conversant with any specialised knotting, lashing or lacing techniques as required on other fittings.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Emergency Lowering Means (AREA)
EP87304232A 1986-05-14 1987-05-13 Gabelbaumende für Segelbretter Withdrawn EP0246078A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU590086 1986-05-14
AU5900/86 1986-05-14

Publications (1)

Publication Number Publication Date
EP0246078A1 true EP0246078A1 (de) 1987-11-19

Family

ID=3696387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87304232A Withdrawn EP0246078A1 (de) 1986-05-14 1987-05-13 Gabelbaumende für Segelbretter

Country Status (2)

Country Link
EP (1) EP0246078A1 (de)
JP (1) JPS62295792A (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2511647A1 (fr) * 1981-08-21 1983-02-25 Mac Nelly Malcolm Mecanisme de bridage pour verrouiller un gui sur un mat
DE3238230A1 (de) * 1982-10-15 1984-04-19 Jens 2100 Hamburg Remmers Gabelbaum mit loesbarer verbindung zum mast
DE8514916U1 (de) * 1985-05-21 1985-08-14 Kranemann, Karl Robert, 5100 Aachen Segelvorrichtung mit einem Mast und einem am Mast angeordneten Gabelbaum
DE3411042A1 (de) * 1984-03-26 1985-10-03 Peter 3000 Hannover Hauptmann Mast- gabelbaumverbindung eines segelsurfgeraetes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2511647A1 (fr) * 1981-08-21 1983-02-25 Mac Nelly Malcolm Mecanisme de bridage pour verrouiller un gui sur un mat
DE3238230A1 (de) * 1982-10-15 1984-04-19 Jens 2100 Hamburg Remmers Gabelbaum mit loesbarer verbindung zum mast
DE3411042A1 (de) * 1984-03-26 1985-10-03 Peter 3000 Hannover Hauptmann Mast- gabelbaumverbindung eines segelsurfgeraetes
DE8514916U1 (de) * 1985-05-21 1985-08-14 Kranemann, Karl Robert, 5100 Aachen Segelvorrichtung mit einem Mast und einem am Mast angeordneten Gabelbaum

Also Published As

Publication number Publication date
JPS62295792A (ja) 1987-12-23

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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: 19880520

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Inventor name: DICKISON MAX