EP0253351A2 - Wishbone pour planche à voile - Google Patents

Wishbone pour planche à voile Download PDF

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Publication number
EP0253351A2
EP0253351A2 EP87110098A EP87110098A EP0253351A2 EP 0253351 A2 EP0253351 A2 EP 0253351A2 EP 87110098 A EP87110098 A EP 87110098A EP 87110098 A EP87110098 A EP 87110098A EP 0253351 A2 EP0253351 A2 EP 0253351A2
Authority
EP
European Patent Office
Prior art keywords
mast
boom
head piece
piece
contact surface
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Withdrawn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
EP87110098A
Other languages
German (de)
English (en)
Other versions
EP0253351A3 (fr
Inventor
Joachim Merath
Rainer Wronka
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
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
Priority claimed from DE19873701055 external-priority patent/DE3701055A1/de
Application filed by Individual filed Critical Individual
Publication of EP0253351A2 publication Critical patent/EP0253351A2/fr
Publication of EP0253351A3 publication Critical patent/EP0253351A3/fr
Withdrawn legal-status Critical Current

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    • 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

  • a surfboard for windsurfing also includes a mast with a surf sail, which is connected to the mast along its forward luff. There is a boom to tension the surf sail and to operate it. It has two fork legs, which are connected at their front end with a head piece and at their rear end with an end piece to the boom. The fork legs are curved in an arc and arranged in a common plane so that the boom has an approximately lenticular plan. A pulley is arranged at the end piece, with which the rear leech of the surf sail can be pulled towards the end piece.
  • the tensile force that occurs between the surf sail and the end piece of the boom is transmitted to the mast in that the head piece, which surrounds the mast on the outside on the outside, is connected to the mast by means of a connecting element.
  • This connecting element generally consists of a rope of a certain length, one end of which is knotted with the head piece.
  • the rope is tied around the mast and around the head piece with one or more turns and its second end is also knotted at the head piece.
  • the surf sail has a recess. In this section, his fore-luff is guided past the mast at a certain distance. Not only is the surf sail tensioned with the boom.
  • the surfer also operates the mast and the sail with the boom, so that both have the best possible view in relation to the surfboard and in relation to the wind direction. Therefore, the connection point between the boom and the mast is designed so that the boom, after tightening the coupling rope, assumes and maintains a certain orientation with respect to the mast, in which the surface normal of the plane that its fork legs span, is aligned at least approximately parallel to the mast.
  • the head piece has a guide and contact surface which is designed as a section of a hollow circular cylinder which is matched to the mast and which has a certain axial extent. This contact surface generally has a central angle that is less than 180 °.
  • the invention has for its object to provide a boom, the connection to the mast is more suitable for power transmission and which entails less risk to the mast.
  • the contact surface on the head piece is turned away from the end piece, that is, the contact surface on the head piece is located on the outside of the boom, the boom is placed with its head piece on the rear of the mast, which is facing the back of the surf sail.
  • the contact surface of the head piece thus also serves as a connecting element. Strictly speaking, a 'connecting element' in the traditional sense no longer exists. Therefore a break of the 'connecting element' can no longer occur.
  • the mast bending elastically when tensioning or trimming the surf sail not only at the edges of the rests on both end faces of the head piece, or, when the boom is pivoted downwards, even rides only on the edge of the lower end face, and instead achieves that, taking into account the material elasticity, there is a contact surface of finite size that only has a small surface pressure of the Mastes results.
  • the head piece snaps elastically on the mast when the boom is pressed on the mast. This also results in a certain clamping effect between the head piece and the mast, by means of which the head piece already maintains its position on the mast in the axial direction when the pulley at the end piece has not yet been tightened and the head piece is not yet under the higher tension force of the pulley block abuts the mast.
  • the head piece is given very good lateral guidance, the moment forces transmitted from the head piece to the mast remaining relatively low even when the surfer in certain driving conditions applies his entire body weight to the person facing him and from him captured fork leg hangs, for example, to hold the surf sail in strong winds. This avoids high edge pressures between the head piece and the mast.
  • the adhesion of the head piece to the mast, in particular in the axial direction, is improved.
  • the head piece retains its predetermined value even when the tension of the pulley system decreases Height at the mast at. Since such a covering is generally made of a rubber-elastic material, the forces are distributed over a larger surface area due to the elastic deformation of the covering, in particular at high moment forces, which leads to a reduction in the surface pressure.
  • the manufacture and attachment of the covering is made much easier by adapting the initially flat molded part to the inner shape of the head piece and, as it were, snapping or snapping the projections and recesses on the inside of the head piece and the shaped piece itself securely holds onto the headpiece due to its own shape and elasticity.
  • the two parts of the head piece due to the elasticity, especially the fork legs, can be pulled apart to the side so far that the surf sail can be pulled between them with the leech in front until the two head piece parts reach the recess in the surf sail to have. Then the two head piece parts can be combined again and put together as a head piece on the mast. In the opposite way, it is also possible to remove the boom. This eliminates the need to thread the boom together with the sail on the mast and vice versa to remove the boom together with the sail to pull it off the mast.
  • the two parts of the head piece can also be pulled apart to such an extent that they can be passed over the mast on both sides from the start and behind the mast in the recess in the sail again with one another can be united.
  • This allows the boom are slipped on over the mast and the sail drawn onto it and the pulley is already connected to the rear leech before the boom with its two-part head piece is placed on the mast.
  • a reliable union and alignment of the two parts of the head piece is guaranteed, which also relieves the contact surfaces on the head piece and the mast of management tasks and the separation forces that may occur when operating the boom.
  • both parts of the head piece are identical to one another, so that they can be produced with one and the same mold or injection mold and the head piece can be assembled therefrom in the usual external shape.
  • the head piece is assembled from two different individual parts.
  • the contact surfaces are arranged symmetrically to the central plane of the boom, which is spanned by the longitudinal axis of the fork legs.
  • the two parts of the head piece are held together by the locking device alone, without the other parts, such as the contact surfaces and, if available, the guide elements, are used for it.
  • the boom with the two fork legs, the head piece and the end piece can be formed as a ring-shaped, self-contained component on which the bracket with the contact surface can be subsequently attached by means of the coupling elements and can be detached therefrom if necessary .
  • This allows the main part of the boom to go over the mast and on it already drawn sails are put on from the outside and then the bow is passed halfway through the recess between the forward luff and the mast and is coupled to the main part of the boom using the coupling elements and then the entire boom is attached to the mast and the sail is tensioned.
  • the boom can be removed from the mast at any time by first loosening the bow from the head piece and removing it from the recess on the sail, and then removing the main part of the boom unhindered without the sail being at least partially removed from the mast must be deducted.
  • a coupling device is created for this purpose, which is simple and inexpensive to manufacture, which is also very easy to use and which is also very robust.
  • a boom designed according to claim 16 can also be retrofitted to the mast after the sail has already been pulled up on it.
  • the belt is detached from the main part of the boom, the main part is lowered from the outside via the mast and the head piece is brought closer to the mast in the area of the recess of the sail, the belt is partly passed through the recess and its two ends on the head piece coupled.
  • this boom can be removed just as easily by first loosening the strap at least at one end from the head piece and pulling it back out of the recess on the sail, after which the entire boom can be lifted off the mast with the sail attached to it.
  • the belt conforms evenly to the mast, so that practically everywhere there is the same, relatively low surface pressure between the mast and the belt, and it is also reliably avoided that the mast could ever lie against a hard edge of the boom and could be damaged or destroyed there by increased surface pressure.
  • a further development of the boom according to claim 17 creates a coupling device which is particularly simple to manufacture and in particular easy to handle, and which is also very robust and less prone to failure.
  • the hook mouth can be narrowed so far on the second hook that its clear width compared to the outer diameter of the coupling pin has a slight undersize which lies within the elastic deformation path of the hook.
  • This design of the hook can also be carried out on the first-mentioned hook if, after using the boom, the belt is to be removed completely from the main part of the boom.
  • the fork legs are no longer connected to each other at their front part via a head piece.
  • the boom has the shape of a fork in the narrower sense of the word. His two fork legs can therefore be separated from each other by approaching the sails that are mounted on the mast, where they are coupled by means of the plug-in couplings to the mast sleeve, which was previously attached to the mast in the area of the recess of the sail.
  • a further development of the boom according to claim 19 ensures that both the straight mast fits into the mast sleeve when the sail is not under tension, and the mast that bends elastically when the sail is tensioned does not abut the edges of the end faces of the mast sleeve and is bent there over the edge will, but that he adhere to the in the vertical plane of symmetry, convexly curved rear inner surface of the mast sleeve, depending on the degree of its curvature, can create a larger or smaller area, and as a result the surface pressure in the contact area remains relatively low and in any case, inadmissible values are avoided.
  • connection of the fork legs can be moved at least approximately up to the meridian plane of the mast forward. This reduces the bending moments in the insert flaps and in the wall parts of the insert pockets. In addition, it is thereby achieved that the insertion pockets practically do not protrude beyond the outline of the mast sleeve in the narrower sense in the elevation, and the mast sleeve thus receives a compact appearance.
  • the insert flaps with their front wall lie fully against the corresponding front wall of the insert pocket.
  • particularly favorable dimensions are achieved, in which the pockets and thus the insertion flaps remain practically within the outline of the mast pocket in the front view, in addition, in a front view from the front to the rear or vice versa, the pockets only little about Extend the outer wall of the mast sleeve and also a very large guide surface is achieved in the transverse direction.
  • the upper edge and the lower edge of the insertion flaps are so far apart from each other in the vertical direction that the moment forces caused by the eccentric load on the boom remain relatively low when the surfer hangs with his entire weight on the fork leg facing him, to keep the sail in the right orientation even in strong winds.
  • the mast sleeve receives a certain elasticity in the circumferential direction through the longitudinal slot, so that it can be pushed more easily over the mast by being elastically expanded if necessary.
  • the mast sleeve for a particular mast can be pre-shaped so that after being pushed onto the mast it engages around it with a certain spring force, as a result of which the mast sleeve has a higher hold on the mast.
  • this elasticity in the circumferential direction can better compensate for tolerances in the outer circumference of the mast and / or the inner circumference of the mast sleeve.
  • the sliding of the mast sleeve is considerably facilitated in that the expanding cam is rotated into its spreading position beforehand, in which the mast sleeve is somewhat expanded within its elastic deformability, so that it has a slight, if any, excess compared to the mast Has. If the mast sleeve on the mast in the right place is pushed, the spreader cam is turned back to its starting position or rest position, whereby the mast sleeve narrows again and is sufficiently tight against the mast under the effect of its elastic inherent tension.
  • the expanding cam is held in place in the direction of the longitudinal slot at the bearing point. If the expansion cam is also provided on both ends with a collar or collar, the outside diameter of which is larger than the largest outside diameter of the expanding cam, then the expanding cam is securely held in its two axial directions without further measures.
  • a further development of the boom according to claim 27 facilitates the actuation of the expansion cam, in particular when using a slot, any screwdriver and even coins or flat sheet metal parts can be used as tools to twist the expansion cam.
  • the surf sail 11 shown in FIG. 1 is connected to a mast 13 along its forward luff 12.
  • the surf sail 11 is provided along the forward luff 12 with a mast pocket 14 into which the mast is inserted.
  • a boom 15 which is supported at its front end on the mast 13 and which is connected at its rear end to the leech 16 of the surfing sail 11 via a pulley (not visible).
  • the surf sail 11 has a cutout 17 in which the mast pocket 14 is interrupted and the forward luff 12 is guided behind the mast 13 at a certain distance from it.
  • the surf sail 11 has several pockets for battens 18.
  • the mast 13 is equipped at its lower end in the usual manner with a swivel joint 19 which can be pivoted on all sides.
  • the boom 15 has two fork legs 21 and 22 in a conventional manner (FIGS. 1 and 2).
  • the two fork legs 21 and 22 are slightly curved and arranged in such a way in a common plane that the floor plan of the entire boom 15 is approximately lenticular.
  • the two fork legs are designed as light metal tubes or as plastic tubes. They are connected at their front end to a head piece 23 and at their rear end to an end piece 24, whereby they form the boom 15.
  • the end piece 24 is conventionally equipped with a false pull, not visible in FIG. 1, in order to be able to tension the rear leg 16 and thus the entire surf sail 11, as shown in FIG. 1.
  • the tensile force exerted by the pulley on the boom 15 is supported on the mast 11 via the head piece 23.
  • the head piece 23 is made as a light metal casting from seawater-resistant light metal or as a plastic molded part from an equally seawater-resistant plastic.
  • the head piece 15 has a shell body 25 at least approximately. It is designed as a section of a circular cylinder, the central angle of which is slightly more than 180 °.
  • the shell body 25 has a certain axial extent, as can be seen from FIG. 1.
  • the circular cylindrical inner surface of the shell body 25 serves as a contact surface 26 for the mast 13.
  • a lining 27 is applied to the contact surface 26, which has a higher coefficient of friction than the material of the shell body 25 and which is made of a suitable material .
  • the covering 27 is at least partially pulled over the side edge, so that the lateral end edges of the covering 27 are outside the insertion area of the mast 13 and are not repelled and detached from the mast 13 when the head piece 23 is placed on it can be.
  • two receiving pins 31 and 32 are formed on the outside of the shell body 25, which are for receiving the front one Serve ends of fork legs 21 and 22.
  • the receiving pins 31 and 32 are at least approximately radially aligned with the cylinder axis of the shell body 25.
  • the central angle of the longitudinal axis of the two locating pins 31 and 32 depends on the curvature of the fork legs and the resulting angular position of their front ends, as can be seen in FIG. 2. In a first approximation, one can assume a central angle of 90 °.
  • the receiving pins 31 and 32 have at least approximately the same outer diameter as the fork legs 21 and 22. At their ends, a certain length section in the outer diameter is set down to the inside diameter of the fork legs 21 and 22, whereby a guide pin 33 is created, on which is pushed on the front end of the fork leg in question, as indicated on the right in FIG. 2.
  • a rivet 34 By means of a rivet 34, the fork leg 22, which is placed on the guide pin 33, is firmly connected to the receiving pin 32.
  • a releasable connection can also be used, for example by means of a plug pin or in some other way.
  • reinforcing ribs or stiffening ribs 35 and 36 are integrally formed on the outside of the shell body.
  • the reinforcing ribs 35 extend from the receiving pins 31 and 32 to approximately the side edge 28 and 29 of the shell body 25.
  • the stiffening rib 36 extends between the receiving pins 31 and 32.
  • the contact surface 26 for the contact of the mast 13 is located on the front of the head piece 23, which faces away from the end piece 24.
  • the tensile force generated by the pulley between the rear leg 16 and the end piece 24 can be transmitted directly to the mast 13 via the fork legs 21 and 22 and via the head piece 23 as a compressive force, without the need for any other connecting elements.
  • the central angle of the shell body is somewhat larger than 180 °, after the head piece 23 is placed on the mast 13, the latter is encompassed somewhat by the shell body 25, so that the head piece 23 also adheres to the mast 13 when the pulley block at the end piece 24 is still in place is not fully tense or if it is temporarily loosened or should unwind somewhat. This sticking of the head piece 23 to the mast 13 is further supported by the covering 27 with a higher friction mechanism.
  • the central angle of the side edges 28 and 29 of the shell body 25 can be increased to such an angular value at which the elasticity of the covering 27 and the side edge regions of the shell body 25 alone is no longer sufficient by itself Push the head piece 23 laterally onto the mast 13, in which, however, by utilizing the elasticity of the fork legs 21 and 22 and by actuating them as scissor arms, the shell body 25 can be deformed elastically to such an extent that there is a sufficient spreading of the side edges 28 and 29. For this purpose it may be necessary to give the stiffening rib 36 a different shape between the two locating pins 31 and 32.
  • the shell body 38 is divided into three shell parts 41, 42 and 43 by two parting lines 39 and 40 running in a normal plane to the cylinder axis of the shell body 38 (FIG. 4).
  • the two shell parts 41 and 43 located at the end are firmly connected to a base body 44, with which they are produced as a one-piece casting.
  • the shell part 42 located in the middle is firmly connected to a base body with which it is also made in one piece.
  • the receiving pin 46 is also formed for the one fork leg and on the base body 45, the receiving pin 47 is formed for the other fork leg.
  • the shell parts 41 and 43, the base body 44 and the mounting pin 46 together form the one head piece part or head part 48 for short.
  • the shell part 42, the base body 45 and the mounting pin 47 together form the other head part 49.
  • the two shell parts 41 and 43 are shown in Fig. 3 and 4 with the same axial extent as the shell part 42. Since the tensile force of the pulley is largely distributed evenly to the two fork legs, it is expedient that the shell part 42 at least approximately same axial extension as that two shell parts 41 and 43 together, so that the bending stress within the shell parts and the transition point to the associated base body in both head parts 48 and 49 are at least approximately the same size.
  • support devices 51 are arranged between the free ends of the shell parts 41 and 43 and the base body of the other head part. These are each formed by a support pin 52 and a support hole 53 matched thereto.
  • the support pins 52 are each arranged on the outside of the free end of the shell parts 41 to 43.
  • the support holes 53 are arranged in the line of alignment of the associated support pin 52 in the relevant base body 44 or 45.
  • the support pin 52 and the support holes 53 are either aligned diametrically to the cylinder axis and at the same time at right angles to the vertical center plane of the entire head piece 37 or they lie in a parallel plane to this diametral plane, as can be seen from FIG. 4, in which another two-part head piece is shown . 5 can largely be understood as a top view of the head part 37 from FIGS. 3 and 4.
  • the support devices 51 can simultaneously serve as guide devices for the two head parts 48 and 49 if they each end up with a fork leg from the spread-apart or open position (Fig. 4) are brought together to form the complete head piece 37 (Fig. 3). This also ensures that the shell parts 41 and 43, on the one hand, and the shell part 42, on the other hand, are perfectly aligned in the axial direction on the combined head piece 37 and thus lie evenly against a mast.
  • the head piece 55 is composed of the two head parts 56 and 57.
  • the shell body 58 is subdivided into the two shell parts 61 and 62 by a single parting line 59 located in the horizontal central plane of the boom and the head piece 55. These have the same axial extent with one another (FIG. 6).
  • the shell part 61 is made in one piece with a base body 63 and the shell part 62 with a base body 64.
  • a receiving pin 65 and 66 is again formed, which serves to receive one of the two fork legs 21 and 22, respectively.
  • the base bodies 63 and 64 may only extend beyond the vertical central plane 67 (FIG. 5) in the axial region in which the associated shell part 61 or 62 is located. In the axial area of the shell part of the other base body, it may only extend to the central plane 67 so that the two shell parts can be brought together laterally.
  • the basic bodies 63 and 64 and the receiving pins 65 and 66 formed on them are of identical design to one another and are combined in the same way with the associated shell part 61 and 62, so that both head parts 56 and 57 are symmetrical on the envelope, if one is from the two shell parts 61 and 62 starts, the line of intersection between the vertical center plane 67 and the horizontal center plane 68 running in the parting line 59 forming the pivoting or turning axis.
  • the support devices 71 On the two head parts 56 and 57, in a plane that runs parallel to the meridian plane 69 of the cylindrical shape of the shell body 58 and the mast 13, there are two support devices 71, each of which is in turn by one Support pin 72 and a support hole 73 are formed.
  • the support pins 72 are arranged on the outside of the free end of the shell parts 61 and 62. Accordingly, the support holes 73 are arranged on the base body 64, specifically in the line of alignment of the support pin 72 on the other head part.
  • the support devices 71 also serve to guide the two head parts 56 and 57 when they are brought together to form the closed guide head 55 (FIG. 6).
  • the mast 13 with the surf sail 11 is indicated by dash-dotted lines between the open and spread-apart head parts 56 and 57 in order to show how the two head parts 56 and 57 can be guided past the mast 13 in order to behind it in the recess 17 of the Surfing sail 11 (FIG. 1) can be combined again to form the head piece 55, as can be seen from FIG. 5 (in the opposite orientation).
  • the head piece 75 shows a head piece 75 which is modified compared to the head piece 55 (FIG. 5).
  • the head piece 75 has the two head parts 76 and 77, which are largely identical to the head parts 56 and 57.
  • the modification of the two head parts 76 and 77 is that they are provided with a locking device 80.
  • the locking device 80 is arranged in the vertical center plane 67.
  • an eye 81 and 82 are formed on the outside of each of the two shell parts 78 and 79. They each have a through hole 83 and 84, which are aligned with one another.
  • the two through holes 83 and 84 are generally circular cylindrical.
  • the locking device 80 also includes a locking pin which is matched to the two through holes 83 and 84. This locking pin is expediently captively connected to one of the two head parts 76 or 77 via a connecting element in the form of a short chain or a short rope.
  • a locking bolt can also be used, which is designed together with the through holes 83 and 84 so that it can be pulled out of the lower through hole 83, but not out of the upper through hole 84.
  • a self-locking locking bolt or locking bolt 85 can be seen, which is provided with a head 86.
  • Its shaft 87 is circular cylindrical.
  • the shaft 87 has a length which is greater than the height of the two eyes 83 and 84, so that an end section 88 of a certain length protrudes from the lower eye 88.
  • the locking bolt 85 is provided with a position lock 89, which ensures that the locking bolt 85 remains in the locking position in all positions of the boom 15. This reliably ensures that when the boom 15 is placed on the mast 13, the two head parts 76 and 77 cannot laterally move away from one another, which would make it difficult to put the head piece 75 on the mast 13.
  • a pawl 91 which is held by a spring clip 92, belongs to the position securing device 89.
  • the locking bolt is hollow at least on the side of the length section 88, and expediently through a centrally arranged axial blind hole or through hole 93.
  • the pawl 91 extends through a recess 94 in the peripheral wall of the length section 88 through from the inside out.
  • the pawl 91 has a nose-shaped elevation. Its pawl surface 95 faces the head 86 of the locking bolt 85. Its back surface 96 extends in the securing position of the pawl 91 (FIG. 11) from the end of the pawl surface 95 to within the outline of the shaft 87.
  • the pawl 91 has a groove 97 on both sides in the area facing away from the back surface 96, parallel to the longitudinal axis of the shaft 87 are aligned.
  • the cross-sectional shape of the grooves 97 is matched to the cross-sectional shape of the spring bracket 92 and is, for example, semicircular if the spring bracket 92 is made from a round spring steel wire.
  • the pawl 91 has a dimension in the horizontal direction that is greater than the clear width of the through hole 93. As a result, the pawl 91 cannot be pushed into the through hole 93 and then axially pushed away therein. It can only be inserted from the outside through the recess 94.
  • the spring clip 92 is designed similar to a hairpin spring.
  • the two leg sections 99 adjoining the semicircularly curved apex 98 are at a mutual distance which is at most the same or preferably slightly smaller than the distance of the two grooves 97 on the pawl 91 measured from the outside. Characterized the pawl 91 is clamped by the leg portions 99 as soon as it is inserted with its grooves 97 between the leg portions 99.
  • Two further straight leg sections 101 adjoin the leg sections 99 and are bent relative to the leg sections 99. The clear distance between the two leg portions 101 is at least equal to the thickness of the pawl 91, so that it can be inserted between the leg portions 101 without difficulty before it is displaced in the axial direction between the leg portions 99.
  • Two of the two straight leg sections 101 close approximately U-shaped curved leg sections 102, the dimensions of which are matched to the dimensions of the through hole 93.
  • the through hole 93 is widened at a certain distance from the recess 94, so that a shoulder 103 is provided with a flat circular ring surface.
  • the bow ends 104 are designed and arranged such that their free end sits on the shoulder 103 when the two leg sections 99 with the pawl 91 inserted therebetween are just at the level of the recess 94.
  • the pawl 91 is mounted in such a way that the spring clip 92 is first pushed into the through hole 93 so far that the leg portions 101 are at the level of the recess 94. Then the pawl 91 is pushed from the outside through the recess 94 between the leg portions 101. The spring clip 92 is pushed further into the through hole 93, the two leg portions 99 engaging in the grooves 97 on the pawl 91. The spring clip 92 is pushed in until the apex 98 rests on the underside of the pawl 91 and until the ends of the leg sections 104 are snapped onto the shoulder 103. Thereafter, the spring clip 92 can no longer slip out of the through hole 93 by itself.
  • the underside 105 of the pawl 91 can be partially set back, so that a projection 106 remains after the back surface 96.
  • the pawl 91 then rests with the underside 105 on the lower edge of the recess 94 when it is loaded downward in the axial direction.
  • the projection 106 projects beyond the edge outwards and downwards and forms a stop for the pawl 91 which acts inwards in the radial direction
  • the force acting on the pawl surface 95 does not slide along the back surface 96 and is pushed inward. the pawl 91 can only be pressed inwards if it is relieved in the axial direction.
  • the locking bolt 85 can also be pushed into the lower eye 83 and pulled out of the lower eye 83 on the head 86 in order to be able to laterally separate the two head parts 76 and 77 from one another.
  • the head piece 110 shown in FIGS. 11 and 12 is designed similarly to the head piece 23 (FIG. 2). It has a one-piece shell body 111, which has a U-shaped plan. Its concave inner surface forms the contact surface 112 of the head piece 110 for the mast 13. With respect to the vertical plane of symmetry 113 of the head piece 110, which is symbolized in FIG. 11 by a chain line, the contact surface 112 is convexly curved, as can be seen from FIG is. The radius of curvature is at least approximately equal to the smallest possible radius of curvature of the mast 13 which it achieves when the surfing sail is trimmed by elastic deformation.
  • the inner surface of the shell body 111 is also provided with a covering or a coating 114 beyond the contact surface 112 and beyond the front edge of the shell body 111, which has a higher coefficient of friction than the material of the shell body 111.
  • This coating 114 expediently has a rubber-elastic consistency.
  • a receptacle 115 and 116 for the fork legs 117 each adjoin the shell body 111 on both sides.
  • the first length section 118 and 119 of the receiving pins 115 and 116 is in relation to the vertical plane of symmetry 113 aligned at least approximately at right angles.
  • the adjoining longitudinal sections 121 and 122 are angled and run at an angle with respect to the plane of symmetry 113, which is based on the desired course of the fork legs 117 and which is, for example, 45 °.
  • the adjoining guide pin 123 is offset so far that the front end of the tubular fork legs 117 can be plugged on and the circumferential surface of the fork legs 117 and the longitudinal sections 121 and 122 are flush with one another.
  • the shell body 111 has a height that is greater than the diameter of the mast 13, at least in the area around the meridian section oriented at right angles to the plane of symmetry 113.
  • a ratio of 1.5 to 3.0 based on the diameter of the mast 13 is advantageous.
  • a covering which is designed as an independent molded part is used in the head piece 127 shown in FIG. 13.
  • This covering 126 can either be produced as a molded part in the narrower sense in a correspondingly designed casting mold or injection mold. Or, if the material used for it is sufficiently elastic, it can also be punched out of a flat sheet of this material and then brought into the U-shape in which it is inserted into the shell body 128 of the head piece 127. If the covering 126 is less rigid, it is glued to the shell body 128.
  • 126 holding elements 129 can be used to fasten the covering are used, which are expediently formed on the shell body 128 as circular cylindrical projections 131 and on the covering 126 as circular cylindrical recesses 132 matched thereto (FIGS. 14 and 15).
  • its flat development has at least approximately the same outline as the flat development of the inner surface of the shell body 128 serving as the contact surface of the head piece 127.
  • a head piece 135 can be seen, in which the bearing surface 136 for the mast is arranged on a bracket 137 with a U-shaped outline.
  • the bracket 137 is detachably connected to the head piece 135 by means of coupling devices 138 and 139.
  • Both the bracket 137 and the head piece 135 can be designed as a cast or forged part made of light metal or as a molded plastic part.
  • the receiving pins 141 and 142 are formed for the fork legs, not shown.
  • one eye 143 and 144 are formed on each of the two ends of the bracket 137.
  • Their eye hole 145 or 146 is designed as a circular cylindrical through hole.
  • an eye 147 and 148 are formed on the head piece 135.
  • Their eye holes are aligned with eye holes 145 and 146 of bracket 138.
  • the eyes 143 and 144 have a height in the direction of the longitudinal axis of their eye holes which is more than twice the height of the eyes 147 and 148 of the head piece 135.
  • the eyes 143 and 144 have a recess 149 (FIG. 17) in the middle of their height, the clear height of which is at least approximately the same or slightly larger than the height of the eyes 147 and 148 on the head piece 135.
  • the ends of the bracket 137 get in elevation the shape of a fork which is pushed over the eyes 147 and 148 of the head piece 135 when the bracket 137 and the head piece 135 are joined together.
  • coupling bolts 151 and 152 which are matched to the eye holes in the pairs of eyes on the head piece 135 and on the bracket 137.
  • Both coupling bolts 151 and 152 can be of identical design to one another. It is more expedient, however, to design one of the coupling bolts, for example the coupling bolt 152, and the eye holes of the pair of eyes 144 and 148 in such a way that the coupling bolt 152 sits with a driving fit or with a slight press fit in the eye 144 of the bracket 137 and opposite the eye 148 of the head piece 135 has a slight game.
  • the pair of eyes 144 and 148 and the coupling bolt 152 act as a hinge joint for the bracket 137, by means of which it can be pivoted relative to the head piece 135.
  • the other coupling pin 151 is guided in the pair of eyes 143 and 147 so as to be longitudinally displaceable.
  • the contact surface is also designed to be detachable from the head piece.
  • the contact surface 158 is formed by the inner wall surface of a belt 159, which in its Is designed to be flexible in the longitudinal direction.
  • the belt 159 is detachably connected to the head piece 163 by means of coupling devices 161 and 162.
  • an eyelet 165 is provided on both end sections 164 of the belt 159 (FIG. 21), which has a circular cylindrical through hole 166 which is aligned at right angles to the longitudinal extent of the belt 159.
  • a circular cylindrical coupling pin 167 made of metal is inserted into each of the two through holes 166. It is retained in that the through hole 166 has a certain undersize compared to the nominal diameter of the coupling pin 167.
  • reinforcement elements 168 are embedded in its base material, which has rubber-elastic properties, which have, for example, the shape of a fabric insert, a wire rope insert, a perforated sheet insert or the like.
  • This reinforcing element 168 is guided in the wall of the eyelet 165 at a distance around the through-hole 166, the length section 169 of the reinforcing element 168 extending beyond the eyelet 165 being led back a certain distance in the belt 159 in the direction of the other belt end. It is even better if the reinforcing element 168 is closed in a ring shape and has the shape of a short piece of hose which is folded flat and is embedded in the base material in this shape.
  • two hooks 171 and 172 are arranged on the head piece 163, in particular molded onto them.
  • the hook mouth opens outwards, ie towards the side facing away from one another.
  • the hook base is matched to the shape of the coupling pins 167 and as Section of a circular cylindrical surface is formed.
  • the hook mouth itself is oriented in such a way that its cheek facing the belt 159, against which the coupling pin 167 rests, encloses an angle with the longitudinal direction of the adjoining belt section which is at least 90 °, but better than 90 °, so that the coupling pins 167 are pulled into the hooks 171 and 172 when the belt 159 is under tensile stress.
  • the hook mouth of the one hook e.g. of the hook 172
  • this hook 172 acts like a hinge joint for the strap 159.
  • the other hook 171 can be narrowed to such an extent that the associated hook jaw must each be elastically expanded using a certain force if the associated coupling pin 167 is to be hooked in or out. This snap action of the hook jaw prevents the coupling pin 167 from involuntarily sliding out of the hook when the surf sail is not yet tensioned by means of the pulley.
  • the hooks 171 and 172 are at least partially in the same plan area as the belt 159, the hooks 171 and 172 have a recess 173 and 174 in the middle of their height, through which the hooks 171 and 172 appear fork-shaped in the side view.
  • the recesses 173 and 174 extend so far into the head piece 163 that the belt 159 and the eyelets 165 have sufficient movement space at both ends so that the coupling pins 167 can be hooked and unhooked unhindered on the hooks 171 and 172 .
  • the belt 159 can essentially only exert a tensile force in the direction of the vertical plane of symmetry 175 of the head piece 163 due to its elastic flexibility, but cannot absorb lateral forces aligned at right angles thereto, the hooks 171 and 172 are extended a certain distance beyond their hook mouth.
  • Their mutually facing back surfaces are aligned parallel to one another and parallel to the plane of symmetry 175. They are at a mutual distance which is at least approximately the same as the outside diameter of the mast 13, a covering which is attached to the back surfaces and is not shown in detail in FIG. 18 being included. These back surfaces each form a lateral guide surface 176 and 177 for the mast 13.
  • the guide surfaces 176 and 177 extend rearward by a certain distance beyond the meridian plane of the mast 13.
  • a semicircular transition surface 178 adjoins the guide surfaces 176 and 177, which is at a sufficient distance in the longitudinal direction from the desired position of the mast 13 shown in FIG. 18, so that the mast 13 is so far against the head piece when the belt 159 is put on 163 can be approximated that the belt 159 is still untensioned when the coupling pins 167 are hooked or unhooked into the hooks 171 and 172.
  • FIGS. 22 ... 28 The embodiment of the boom shown in FIGS. 22 ... 28 is more modified compared to the previously explained embodiments.
  • the fork legs 180 (FIG. 27) are still joined together at their rear end via an end piece corresponding to the end piece 24 in FIG. 1, to which a pulley for tensioning the sail is attached.
  • Their front ends are not connected to each other. Instead, they are each provided with a fork leg head 181 (Fig. 26 ... 28), by means of which they can be coupled to a mast sleeve 183 via a plug coupling 182 (Fig. 23).
  • the front fork leg ends are only indirectly connected to one another via this mast sleeve 183.
  • the mast sleeve 183 is at least approximately designed as a hollow cylinder, the clear width of which is at least approximately equal to the outer diameter of the mast 13.
  • the front part of the mast sleeve 183 in the installation direction has an inner surface 184 which represents the negative image or the impression of a straight circular cylinder.
  • the rear part of the mast sleeve 183 has an inner surface 185 which represents the impression of a torus, the cross-sectional area of which is a circle and which is curved in the shape of a circular arc.
  • the radius of curvature of the inner surface 185 measured in the vertical plane of symmetry of the boom is at least approximately equal to the smallest possible radius of curvature of the mast 13 which it achieves when the surfing sail 11 is trimmed by elastic deformation.
  • the mast designated by 13 ⁇ is uniform on the inner surface 185. This therefore also forms the contact surface 186 of the mast sleeve 183 and thus the contact surface of the boom for the mast 13.
  • the entire inner surface of the mast sleeve 183 is provided with a covering or a coating 187, as in the head pieces of the other exemplary embodiments.
  • the front part of the mast sleeve 183 is slotted in the vertical plane of symmetry by an axially continuous longitudinal slot 188, so that it can be expanded elastically and thus can be more easily pushed onto the mast 13 and removed again.
  • the mast sleeve 183 can be deformed so far at right angles to the vertical plane of symmetry of the boom, namely that it is given a certain undersize in this transverse direction compared to the outer diameter of the mast 13, this is such that the spring force which arises when the mast sleeve 183 is expanded to the nominal diameter of the mast 13 remains within the permissible limits with regard to the surface pressure between the mast sleeve 183 and the mast 13.
  • the clear width of the longitudinal slot 188 is expediently dimensioned such that it is closed when the mast sleeve 183 is deformed when the plastic deformation of the mast sleeve 183 has reached the optimum value. This prevents this deformation from exceeding the permissible value.
  • an insertion pocket 191 and 192 are molded onto the mast sleeve 183 on the two outer sides facing away from the vertical plane of symmetry. These insertion pockets 191 and 192 are open on the side facing the end piece of the boom.
  • the two insertion pockets 191 and 192 are arranged at least approximately diametrically to the mast 13 and aligned parallel to one another.
  • the interior of the insertion pockets 191 and 192 represents at least approximately the impression of a flat, narrow plate.
  • the inside height of the insertion pockets 191 and 192 is expediently 1.5 to 3.0 times larger than the diameter of the mast 13.
  • the depth of the insertion pockets 191 and 192 is at least approximately the same as the diameter of the mast 13 or only slightly different therefrom.
  • the inside width of the insertion pockets 191 and 192 measured in the transverse direction is only a fraction from about 1/3 to 1/5 of the diameter of the mast 13. From these dimensions, the clear width of the insertion pockets 191 and 192 depends to a large extent on the material of the mast sleeve 183 and the other parts of the plug-in couplings 182, which is why their dimension depends on the dimensions specified Value ratios may differ.
  • the other coupling part of the plug-in couplings 182 is formed by a plug-in tab 193 which is attached to the end of the fork leg head 181, in particular is molded thereon.
  • the insertion tabs 193 of the two fork leg heads 181 are aligned parallel to one another.
  • the two fork legs 180 are designed and arranged and aligned on the end piece of the boom so that the two insertion tabs 193 have the same mutual center distance as the insertion pockets 191 and 192 on the mast sleeve 183.
  • the height of the insertion flaps 193 is less than the clear height of the insertion pockets 191 and 192.
  • the width of the insertion flaps 193 measured in elevation is at least approximately equal to the depth of the insertion pockets 191 and 192.
  • the thickness of the insertion flaps 193 is approximately the same or only slightly less than the inside width of the insert pockets 191 and 192, depending on the manufacturing tolerances for the insert pockets and the insert flaps with regard to dimensional accuracy and surface quality.
  • a transition part 194 (FIGS. 26 ... 28) adjoins the insertion tab 193, which at least approximately has a rectangular or square cross-sectional area.
  • the thickness of the transition part 194 is at least equal to or slightly greater than the wall thickness of the outer wall 195 or 196 of the insertion pocket 191 and 192 (FIGS. 23 and 25).
  • the fork spigot 181 is connected to the transition part 194 of the receiving pin 197 for the fork spar 180, which is angled at a certain angle relative to the transition part 194.
  • the transition part 194 adjoins the outside of the associated insertion flap 193, is therefore located in elevation within the outline of the insertion flap 193, and since the insertion flap 193 is fully inserted into the associated insertion pocket 191 or 192, the outer wall 195 or 196 is the Insert pockets 191 and 192 each have a recess 198 or 199, which is located in the same tear-open area as the transition part 194 on the fork leg heads 181.
  • the clear height of the recesses 198 and 199 is greater than the height of the transition part 194, at least in the same ratio of the heights of the insertion pockets and the insertion flaps.
  • the transition part 194 is arranged on the insertion tabs 193 so that their rear boundary walls are flush with one another. In addition, the transition part 194 extends forwardly only over part of the outside of the insertion tabs 193. The same applies to the height of the transition part 194.
  • the front end wall 201 or 202 of the insertion pockets 191 and 192 is curved in the shape of a circular arc.
  • the front end wall 203 of the insertion flaps 193 is curved in a circular arc, the radius of curvature of the end walls 201 and 202 and that of the end wall 203 being at least approximately the same.
  • the insertion flaps 193 always lie with their end wall 203 over the entire surface of the assigned end wall 201 or 202 of the insertion pockets 191 or 192, regardless of the angular position of the fork legs 180 relative to the mast sleeve 183, insofar as only that due to the difference in height between them the insertion flap 193 and the insertion pockets 191 and 192 predetermined limit value of the inclination is not exceeded.
  • the size of the possible swivel range also depends on the size of the radius of curvature of the end walls lying against one another. The freedom of movement the smaller this radius of curvature is, the larger.
  • the maximum value of the swivel angle is reached when the center of curvature of the end walls is at least approximately in the center of the cross-sectional area of the transition part 194, since the insertion tabs 193 can then be freely rotated about this axis of rotation.
  • a modified mast sleeve 205 can be seen from FIGS. 29 ... 31.
  • the modification essentially consists in the fact that an expansion cam 206 is present in this mast sleeve 205.
  • the mast sleeve 205 is configured identically or at least similarly to the mast sleeve 183, so that reference can be made to the description of the mast sleeve 183 in relation to the part of the math sleeve 205 which is not further explained here.
  • the expansion cam 206 has an at least approximately elliptical cross-sectional shape (FIGS. 31 and 32). It is arranged approximately in the middle of the height of the mast sleeve 205 in the region of the longitudinal slot 207, in such a way that its axis of rotation 208 is aligned horizontally and is practically located in the longitudinal center plane of the boom.
  • a recess 213 and 214 are made on both end walls 211 and 212 of the longitudinal slot 207, the peripheral wall of which is a section of a circular cylindrical surface.
  • the spreading cam 206 bears against the peripheral walls of the two recesses 213 and 214.
  • the expanding cam 206 is provided on both ends with an end plate 215 or 216, the outer diameter of which is larger than the largest diameter of the expanding cam 206.
  • the expansion cam 206 is so long that the end plates 215 and 216 abut on the outside and on the inside of the mast sleeve 205. Care must be taken to ensure that the inner end plate 216 does not protrude inward beyond the covering 217 on the inner surface of the mast sleeve 205.
  • a slot 218 is provided on the outer end face of the outer end disk 215, into which a tool, such as a screwdriver blade, a coin or a sheet metal strip, can be inserted, in order in this way to rotate the expanding cam 206 into the desired rotational position.
  • a tool such as a screwdriver blade, a coin or a sheet metal strip
  • the peripheral surface of the outer end disk 215 can be designed as an external hexagon, so that an open-end wrench, a ring spanner or a socket wrench can be attached to actuate the expanding cam 206.
  • a recess with an internal hexagon profile or a serrated profile can also be made.
  • the dimensions of the expanding cam 206 and those of the longitudinal slot 207 and the recesses 213 and 214 are selected and matched to one another such that, on the one hand, the expanding cam 206 in the expanded position (FIG. 32) spreads the two end walls 211 and 212 so far apart that the mast sleeve 205 has a sufficiently large excess compared to the mast on which it is to be attached or from which it is to be withdrawn, and that, on the other hand, in the rest position of the expanding cam 206 (FIG.
  • the wall surfaces of the mast sleeve 205 on both sides of the longitudinal slot 207 stretch elastically so far can narrow that they have a small undersize compared to the nominal diameter of the mast, but at which the surface pressures caused by the spring force of the mast sleeve 205 do not exceed the permissible values at any point.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP87110098A 1986-07-11 1987-07-13 Wishbone pour planche à voile Withdrawn EP0253351A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE8618538U 1986-07-11
DE8618538 1986-07-11
DE19873701055 DE3701055A1 (de) 1987-01-16 1987-01-16 Gabelbaum fuer surfsegel
DE3701055 1987-01-16

Publications (2)

Publication Number Publication Date
EP0253351A2 true EP0253351A2 (fr) 1988-01-20
EP0253351A3 EP0253351A3 (fr) 1988-07-20

Family

ID=25851585

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110098A Withdrawn EP0253351A3 (fr) 1986-07-11 1987-07-13 Wishbone pour planche à voile

Country Status (1)

Country Link
EP (1) EP0253351A3 (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
DE4202522A1 (de) * 1992-01-30 1993-08-05 Hannes Marker Teleskopgabelbaum und gabelbaum-kopfstueck

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8008624U1 (de) * 1980-07-03 Mistral Windsurfing Ag, Nuerensdorf, Zuerich (Schweiz) Vorrichtung zum Verbinden der Griff einrichtung bei Windsurfern
DE2912868A1 (de) * 1979-03-30 1980-10-09 Biggesee Boots Service Gmbh & Segelrigg
FR2456662A1 (fr) * 1979-05-18 1980-12-12 Shark Wassersport Perfectionnements aux dispositifs de fixation de wishbones pour planches a voile
WO1982004425A1 (fr) * 1981-06-11 1982-12-23 Gaide Albert Dispositif de retenue de la bome pour planches a voile
DE8517614U1 (de) * 1985-06-15 1985-11-14 Schäfer, Gerhard, 4970 Bad Oeynhausen Rigg für ein Windsurfing-Brett
DE8606514U1 (de) * 1986-03-10 1986-07-31 Chowaniec, Christian, 5300 Bonn Rigg für ein Segelbrett
DE3516135A1 (de) * 1985-05-04 1986-11-06 Peter René 2000 Hamburg Schmuck Verstellbare dreipunkt mast-gabelbaumverbindung
EP0213034A1 (fr) * 1985-08-07 1987-03-04 Le Profil Wishbone comportant un embout auto-bloquant

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8008624U1 (de) * 1980-07-03 Mistral Windsurfing Ag, Nuerensdorf, Zuerich (Schweiz) Vorrichtung zum Verbinden der Griff einrichtung bei Windsurfern
DE2912868A1 (de) * 1979-03-30 1980-10-09 Biggesee Boots Service Gmbh & Segelrigg
FR2456662A1 (fr) * 1979-05-18 1980-12-12 Shark Wassersport Perfectionnements aux dispositifs de fixation de wishbones pour planches a voile
WO1982004425A1 (fr) * 1981-06-11 1982-12-23 Gaide Albert Dispositif de retenue de la bome pour planches a voile
DE3516135A1 (de) * 1985-05-04 1986-11-06 Peter René 2000 Hamburg Schmuck Verstellbare dreipunkt mast-gabelbaumverbindung
DE8517614U1 (de) * 1985-06-15 1985-11-14 Schäfer, Gerhard, 4970 Bad Oeynhausen Rigg für ein Windsurfing-Brett
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
DE4202522A1 (de) * 1992-01-30 1993-08-05 Hannes Marker Teleskopgabelbaum und gabelbaum-kopfstueck

Also Published As

Publication number Publication date
EP0253351A3 (fr) 1988-07-20

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