WO1986005759A1

WO1986005759A1 - Sail board arrangement

Info

Publication number: WO1986005759A1
Application number: PCT/NO1985/000018
Authority: WO
Inventors: Isto Hamunen
Original assignee: Isto Hamunen
Priority date: 1983-10-10
Filing date: 1985-03-29
Publication date: 1986-10-09
Also published as: EP0215776A1; NO833673L; NO153249B; NO153249C

Abstract

13sail board (10) arrangement where the sail (14) of the board (10) is fastened to a mast (13) and separately or together with the mast is rotatable about the axis of the mast. In addition, the mast is pivotable about a transverse axis preferably via a flexible fastening member (12). The mast with associated sail (14) is manually controllable by means of a boom (17) which extends across the mast approximately at the height of the elbow of the user. The sail (14) is defined by or divided into individually moveable sail sections (14a, 14b) with their respective associated booms (17, 18). The sail sections (14a, 14b) are individually swingable about the common mast (13). The sail sections can be locked in place in specific or arbitrary angular positions relative to each other via locking means which are controlled via manually actuable regulating means.

Description

1 The present invention relates to a sail board arrangement where the sail of the board comprises two individually moveable sail sections which are fastened to a mast and are rotatable about the axis of the mast, the mast in addition being pivotable about a trans¬ verse axis preferably via a flexible fastening member at the lower end of the mast, while the mast with associated sail is manually controllable by means of a boom which extends across the mast approximately at the height of the elbow of the user.

With the present invention the aim is a sail board with which canvas spreads of the sail board can be regulated by simple means and the force of the wind can be utilised in a better manner than hitherto in various directions of the wind. In addition the aim is an arrangement with which the user can be more readily stabilised in the user position and with which the sail board can be more readily controlled in the ocean. The arrangement according to the invention is characterised in that the two individually moveable sail sections are moveable by means of their respective associated booms, the sail sections being swingable individually about a common mast or about their respec¬ tive mast portions extending mutually in parallel or substantially in parallel which are connected to the sail board via a common fastening member.

All according to the conditions the sail sections can be adjusted to greater or smaller angles relative to each other. By adjusting the sail sections in align- ment with each other (180° angle) there can be achieved an especially large canvas spread, while on folding the sail sections tightly against each other (down towards a 0 angle) there can be achieved a limited canvas spread. By adjusting the sail sections to intermediate angles there is also the possibility of being able to intercept the force of the wind from various directions in an effective manner in an anσle formation between the sail sections. By means of smaller angle adjustments between the sail sections the force of the wind can be utilised in a favourable manner as required. A particular advantage can be achieved by correcting the direction of speed of the sail board by equivalent swinging of the one or both sail sections.

According to the invention it is preferred that the one sail section constitutes a main sail and preferably corresponds to a sail of a conventional sail board, and that the other sail section consti¬ tutes an auxiliary sail which can supplement the canvas spread relative to the canvas spread of the main sail and which in addition can be employed as a "guide sail" for controlling the directional speed of the sail board.

In other words one can, if during the sailing there is a need for it, reduce the canvas spread to the canvas spread of the main sail b 'swinging the auxiliary sail to an inactive position on the leeward side of the main sail. Alternatively the utilisation of the force of the wind against the main sail can be regulated by swinging the auxiliary sail relative to the main sail, The auxiliary sail can have an arbitrary size relative to the main sail, but it is preferred that the sail surface of the auxiliary sail constitutes ^* from approximately 1/3 to approximately 2/3 of the sail surface of the main sail. In order to be able to obtain a special utili¬ sation of the force of the wind with the two sail sections it is preferred that the sail sections can be locked in place in definite or arbitrary angular positions relative to each other via locking arrange- ments, which can be controlled via manually actuable regulating arrangements,

Further features of the invention will be evident from the following description having regard to the accompanying drawings in which:

Fig, 1 shows the arrangement according to the invention, illustrated in vertical elevation. Fig. 2 shows in vertical elevation a section of the arrangement according to the invention, illu¬ strated on a larger scale.

Fig. 3 shows a section along the line 3 - 3 of Fig, 2. Fig. 4 shows an alternative construction illu¬ strated in an elevation corresponding to Fig. 1.

Fig. 5 shows an alternative connection between mast and boom, with the mast illustrated in horizontal section. In Fig. 1 there is shown a sailing board 10 with a swivel bearing 11 for a flexible fastening member 12 on a mast 13, to which there is fastened sail 14 of the sailing board. The fastening member 12 is in a known manner flexible in all directions across axis 13a of the mast 13. There is indicated at 12a such a transverse axis.

According to the invention sail 14 of the sail board is divided into two sections 14a and 14b. The one section 14a is designed in a manner corresponding to the conventional sail for a sail board and is designated herein as the main sail. The other section 14b is designated herein as the auxiliary sail.

The sail 14, including the individual sail section 14a and 14b, can be given different shapes all according to need and current use, with larger or smaller canvas spreads and with sail or sail sections which can give different effects. For example there can be employed together with a particular type of main sail various types of auxiliary sail of different size and/or different shape. In the illustrated embodi¬ ment there is shown a construction where the main sail 14a and the auxiliary sail 14b are made individuallY as separate, readily replaceable members. In this connec¬ tion the sail sections 14a and 14b are provided with their respective sleeve-shaped fastening members 15a and 15b which are individually threaded into position on the common mast 13, the fastening members 15a on the one sail section 14a being received in inter¬ mediate openings 16b between the fastening members 15b on the other sail section 14b, while the fastening members 15b are correspondingly received in openings 16a between the fastening members 15a on the sail section" 14a.

According to an alternative, non-illustrated construction the sail sections 14a and 14b can be made in one piece, via an intermediate sleeve-shaped fastening portion which receives the mast.

At a suitable height relative to the sailing board, for example at elbow height of the user of the sailing board, there is fastened a first boom 17 to the sail section 14a and to the mast 13 respec- tively together with a second boom 18 to the sail section 14b and to the mast 13 respectively at a level just below (or just above) the fastening for the boom 17. The sail sections 14a and 14b are easily releaseably fixed with the line straps 14c to the mast 13 in a fastening 13a and via a fastening 13b in a ring member 13c rotatably mounted on the mast. The sail sections 14a and 14b are fastened to the booms 17 and 18 with line straps 14d in equivalent fastenings 17a and 18a. The sail sections 14a and 14b are supported at the top of the mast via their respective fastening elements 14f fastened to the sail section 14a. There is shown an opening 16c be¬ tween fastening members 15a, 15b of the sail sections 14a, 14b for the reception of special fastening arrangements for the booms 17, 18 on the mast 13. In the illustrated embodiment there is illu¬ strated in Figs. 2 and 3 a sleeve member 19 which is rotatably mounted on the mast 13 between an upper and a lower annular stop member 20, 21. The upper stop member can be fastened with a locking pin 22 in a through anchoring hole 23 in the mast, while the lower stop member _.21 can equivalently be fastened with a locking pin 24 in a through fastening hole 25 in the mast. There are illustrated an upper series of fastening holes 23 and a lower series of fastening holes 25 for reception of the locking pins 22 and 24 at different height positions on the mast for adjusting the stop members 20 and 21 and thereby the sleeve member at different height positions on the mast.

On the lower portion of the sleeve member 19 there is secured by means of a fastening strap 26 a C-shaped holder member 27 for the boom 17 to the sleeve member 19. From the holder member 27 the boom 17 projects outwardly in the form of two hoop-shaped members 17a and 17b which are arranged on their respective sides of the intermediate sail section 14a (see Fig. 1) . The holder member 27 rests against the lower stop member 21.

On the upper portion of the sleeve member 19 there is secured by means of a fastening strap 28 a C-shaped holder member 29 for the boom 18 to the sleeve member 19. In a corresponding manner as for boom 17 the boom 18 is formed of two hoop-shaped members 18a and 18b, one on each side of the inter¬ mediate sail section 14b (see Fig. 1) . The holder member 29 rests against a central outwardly pro¬ jecting portion 19a on the sleeve member. In the upper portion of the sleeve member 19 there is de¬ signed a peripheral series of catch grooves 30 for the reception of a bolt 31 which is displaceably received in the holder member 29. The bolt 31 is fastened between two hoops 32a and 32b which extend a certain distance from their respective hoop-shaped members 18a and 18b of the boom 18. The hoops 32a and 32b are rigidly fastened to the outer end of the boom 18 (see Fig. 1} , but are received with a certain limited possibility of movement in the holder member 29 for movement to and from engagement with one of the catch grooves 30 in the sleeve member 19. The movement of the bolt 31 out of locking engagement with an associated groove is achieved by squeezing the hoop 32a (32b) with a hand grip against the hoop member 18a (18b) . By this the boom 18 can be pivoted with a certain application of force to a desired position relative to the mast 13 and the boom 18 connected with that for adjustment in a new angular position immediately the hand grip about the hoop 32a (32b) is released. The inherent rigidity of the hoops 32a, 32b provides for the slipping into position of the bolt 31 into a new catch groove immediately the hand grip about the acutated hoop 32a (32b) is re¬ leased . By employing a hoop 32a and 32b on their respec¬ tive sides of the sail section 14b the sail can be employed in a corresponding manner on both sides, that is to say independently of which side the wind blows from relative to the sail board. In order to ensure friction between the holder members 27 and 29 and the associated sleeve member 19 the holder members can be provided on the inner side which faces towards the sleeve member 19 with a friction-promoting coating of rubber or another suit- able material. If desired the sleeve member 19 can be rigidly fixed to the one or both stop members 20, 21, so that the sleeve member 19 can be rigidly fastened to the mast, while the mast on its side is rotatably mounted in the sail board. However, it can also be possible to fasten the mast non-rotatably to the sail board, while the sleeve member 19 is freely rotatably mounted on the mast. Instead of the illustrated locking mechanism between the sleeve member 19 and the holder member 29 other types of locking mechanisms can be employed for blocking the booms 17, 18 in definite positions to each other. For example, the sleeve member can support holder members of the booms 17, 18 in buttress abutment against each other and can have cooperating gear rims or sets of teeth which engage each other axially inwards in different rotary positions between the holder members, one being able to lift the holder members out of engagement with each other by means of actuating means not shown further. The gear rims or the sets with teeth can in an active position be pressed into engage- ment with each other by means of the weight of the upper boom and/or by means of an associated com¬ pression spring or tension spring between the holder members.

As shown in. Fig. 4, there can be employed two mast components 33a and 33b instead of the one mast 13 illustrated. For example, there can be fastened at the side of the main mast component 33a an auxiliary mast component 33b at the lower end of the mast component 33a on a bracket .34 projecting laterally outwards from this, and there can be de¬ signed, for example, locking means in the bracket 34, so that the auxiliary mast component 32b can be locked in specific angular positions about the axis of the mast component relative to the bracket. In such a case the boom 17 can be stationarily fastened to the main mast component 33a, while the boom 18 can be stationarily fastened to the auxiliary mast component 33b. In such a case the main sail (the section 14a) can be fastened separately to the mast component 33a via associated sleeve-shaped guides 35a, 35b, while the auxiliary sail (the section 14b) can be separately fastenedcorrespondingly to the mast component 33b via corresponding sleeve-shaped guides 36a, 36b. The mast component 33a and the mast compo¬ nent 33b can be connected to each other at the top of the mast and/or other suitable levels by means of link-forming connecting means 37 of, for example, flexible or somewhat elastic material.

In Fig. 5 there is shown a preferred con¬ struction according to the invention for a connection between a mast 40 and a boom 41. The boom 41 is adapted to be able to be swung as required about a first horizontal axis 42 a distance outside the periphery of the mast 40 and about a second hori¬ zontal axis 43 which crosses the vertical axis of the mast 40, and is rotated as required about said vertical axis of the mast.

On the mast 40 there is fastened in a manner not shown further a first fastening member-44 with an upper and a lower stop ring (not shown further) , and between the stop rings there is pivotably mounted about the vertical axis of the mast a collar 45, consisting of two collar half portions 45a and 45b, which are easily releasably fastened around the fastening member 44 by means of fastening screws 46. The collar 45 is fastened via two brackets 47 by means of pivot pin-forming bolts 48 to ears 49 on one end flange 51 of a second fastening member 50. Between the end flange 51 and an opposite end flange 52 there is pivotably mounted on the fastening member 50_. a sleeve member 53 v/ith an associated end flange 54. To the sleeve member 53 there is fastened the boom

41, that is to say two boom half portions 41a and 41b on their respective sides of the sleeve member 53. The boom 41 is adapted to be swung to arbitary angular positions about the axis 43 and at the same time about the axis 42 together with about the verti¬ cal axis of the mast 40.

However, the boom 41 in the position illustrated in Fig. 5 is fixed in a specific angular position about the vertical axis of the mast 40 by means of a first locking pin 56 at the outer end of a regu¬ lating means 57. The locking pin 56 is pushed inwards via a guide hole 58 in the first collar half portion 45a to engage with one of a series of catch holes 59 designed along the periphery of the fastening member 44. The locking pin 56 is pivotably mounted about the axis 42 via a universal joint bearing 60 on the regu- lating means 57, so that the boom 41 can be freely swung about the axis 42, at the same time as the locking pin 56 stands in the illustrated locking engagement with the' fastening member 44 of the mast 40. In the position illustrated in Fig. 5 the sleeve member 53 is fixed to the fastening member 50 in a specific angular position about the axis 43 through the locking pin 56, a second locking pin 61 fastened to an arm 62 which projects a distance laterally out- wards from the regulating means 56 being guided via one of several catch holes 63 arranged in series in the end flange 52 on the fastening member 50 into one of a series of catch holes 64 drilled in the end flange 54 on the sleeve member 53. The regulating means 57 is provided with a pair of elongated regulating rods 57a and 57b which extend just by their respective boom half portions 41a and 41b. By the user pulling the regulating rod 57a (or 57b) inwardly towards the associated boom half portion 41a (or 41b) , as is indicated in full lines by the arrow A, the pins 56 and 61 are adapted to be drawn out of the associated catch holes 59 and 64 respec¬ tively. By this the collar 45 can be freely swung at the same time as the sleeve member 53 can be freely swung. On the user thereafter releasing the regu¬ lating rod this can pivot back, as is indicated in broken lines by the arrow B. The pins 56 and 61 are adapted to be snapped into their respective catch holes 59, 64 in the associated angular positions of the fastening member 44 and the sleeve member 53. At 65 there is shown a guiderod having two guides 65a and 65b for each extension of the regu¬ lating rods 57a, 57b, so that there can be ensured an intended rectilinear movement of the locking pins 56 and 61 via the guide holes 58 and 63 inwards and outwards from the locking engagement with the asso- ciated catch groove.

Claims

CLAIMS :

1. Sail board (10) arrangement where the sail (14) of the board (10) comprises two individually moveable sail sections (14, 14b) which are fastened to a mast (13; 40) and are rotatable about the axis of the mast, the mast (13) in addition being pivotable about a transverse axis preferably via a flexible fastening member (12) at the lower end of the mast, while the mast (13; 40) with associated sail (14) is manually controllable by means of a boom (17, 18; 41) which extends across the mast approximately at the height of the elbow of the user, characterised in that the two individually moveable sail sections (14a, 14b) are moveable by means of their respective associated booms (17, 18; 41), the sail sections (14a, 14b) being swingable individually about a common mast (13; 40) or about their respective mast portions (33a, 33b) extending mutually in parallel or sub¬ stantially in parallel which are connected to the sail board via a common fastening member (12) .

2. Arrangement in accordance with -claim 1, charac¬ terised in that the one sail section (14a) constitutes a main sail and preferably corresponds to a sail of a conventional sail board, and that the second sail section (14b) constitutes an auxiliary sail which can supplement the canvas spread relative to the canvas spread of the main sail and which in addition can be utilised as a "guide sail" for controlling the directional speed of the sail board.

3.. Arrangement in accordance with claim 2, charac¬ terised in that the sail surface of the auxiliary sail (14b) constitutes from approximately 1/3 to approximately 2/3 of the sail surface of the main sail (1.4a) .

4. Arrangement in accordance with claim 1, 2 or 3, characterised in that the sail sections (14a, 14b) can be locked in place in specific or arbitrary angular positions relative to each other via locking means (30, 31; 56, 58; 61, 64) which can be operated via manually actuable regulating means (32a, 32b; 57) .

5. Arrangement in accordance with claim 4, charac¬ terised in that the boom (41) is pivotably mounted about an axis (42) which extends across the longi¬ tudinal axis of the mast (40) just outside the peri¬ phery of the mast, a locking pin (56) , which locks the boom (41) in a specific angular position about the longitudinal axis of the mast (40) , being pivit- ably mounted about said transverse axis (42) , in order to permit pivoting of the boom (41) about the axis (42) in a locked angular position about the longi- tudinal axis of the mast.

6. Arrangement in accordance with claim 4 cr 5, characterised in that the boom (41) is pivotably mounted about an axis (43) which crosses the longi- tudinal axis of the mast (40) , the boom being fixable in specific, regulatable angular positions about said crossing axis (43) by means of cooperating locking means (61, 64) in a mamber (50) connected to the mast (40) and a member (53) connected to the boom (41) .

7. Arrangement in accordance with one of claims 4-6, characterised in that a hoop-shaped regulating means (32a, 32b; 57a, 57b) is adapted by deformation relative to the boom (17, 18; 41) on manual actuation to move a locking means (31; 56; 61) axially inwards into and outwards from a catch hole (30; 59, 64) or similar locking arrangement for locking and nullifying respectively locking enagement between otherwise mutually rotatable members.