DK173794B1

DK173794B1 - Fixing arrangement for attaching stays and used to a boat mast

Info

Publication number: DK173794B1
Application number: DK199901609A
Authority: DK
Inventors: John Lorenzen
Original assignee: Bsi As
Priority date: 1999-11-09
Filing date: 1999-11-09
Publication date: 2001-11-05
Also published as: EP1227969A1; DK199901609A; WO2001034458A1; DE60002230D1; EP1227969B1; ATE237494T1; AU1268801A

Abstract

A fastening arrangement for fastening stays or shrouds (2) to a boat mast (4) comprises an elongated member (8) extending transversely to the mast (4) and being provided with a headed member (9, 11) in each end. Each headed member (9, 11) has a substantially spherical inner bearing surface (23) and a diametrically through-going slot extending axially from the bearing surface and to the outer end face of the headed member. A spherical body is arranged in each headed member (9, 11). The spherical body is arranged at the end of a stay and shroud (2) extending through the slot (21) and is adapted to abut the bearing surface (23). Each headed member (9, 11) is provided with an insertion opening (28) arranged opposite the bearing surface (23). The insertion opening allows for insertion of the spherical body (25) into the interior of the headed member (9, 11) to seat it on the bearing surface (23). A cap (32) is releasably arranged on an outer end portion (31) of each headed member (9, 11).

Description

DK 173794 B1DK 173794 B1

Opfindelsen angår et fastgørelsesarrangement til fastgørelse af stag og vant til en bådmast, omfattende: et aflangt element, som strækker sig på tværs af masten og er fastgjort til denne, et hovedelement, der er fastgjort til det aflange elements ene ende og har en i hovedsagen sfærisk indre lejeflade og en slids, som strækker sig gennem hovedelemen-5 tet frem til lejefladen og har en bredde, der mindst er lige så stor som stagets eller vantets diameter, og et i hovedelementet anbragt legeme med et i det mindste delvis sfærisk hoved, som er indrettet til at ligge an mod lejefladen, hvilket legeme er anbragt omkring enden af et stag eller vant, der strækker sig gennem slidsen.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a mounting arrangement for attaching rods and to a boat mast, comprising: an elongate member extending transversely to the mast and attached thereto, a main member attached to one end of the elongate member and having a substantially a spherical inner bearing surface and a slot extending through the main member to the bearing surface and having a width at least as large as the diameter of the bracket or mitt, and a body disposed in the main element having at least partially spherical head, which is arranged to abut against the bearing surface, which body is disposed about the end of a rod or mantle extending through the slot.

Et fastgørelsesarrangement af nævnte art er kendt fra US-A-3.986.474. Et sådant fast-10 gørelsesarrangement er især fordelagtig i forbindelse med hule master af letmetal, såsom aluminium, og kulfiberarmeret harpiks, idet den på et stag virkende kraft fordeles på et relativt stort område af mastetværsnittet. Imidlertid er montagen af det fra nævnte skrift kendte fastgørelsesarrangement relativ vanskelig. Ved montering af det i skriftet viste fastgørelsesarrangement fastgøres dets sfæriske legeme til stagets ene ende, og staget 15 trækkes dernæst gennem det ene hovedlegemes slids, indtil det ligger an mod lejefladen. Herefter fastskrues det aflange element til nævnte første hovedlegeme. Det aflange element føres nu gennem det ene af to huller, der er boret i masken diametralt overfor hinanden. Efter at have bragt et sfærisk legeme, der er fastgjort til enden af et andet stag, i anlæg mod et andet hovedelements lejeflade, føres det andet hovedelement ind 20 i den anden åbning i masten og skrues på det aflange elements anden ende. Sidstnævnte påskruningen af det andet hovedelement besværliggøres af, at det andet vant strækker sig ud af dette, hvorved nævnte stag må svinges med rundt eller til stadighed holdes koaksialt med det andet hovedelement under påskruning af dette.A fastening arrangement of the kind is known from US-A-3,986,474. Such a fastening arrangement is particularly advantageous in connection with hollow masts of light metal, such as aluminum, and carbon fiber reinforced resin, being distributed on a staggering force over a relatively large area of the mast cross-section. However, mounting of the attachment arrangement known from the aforementioned writing is relatively difficult. By mounting the attachment arrangement shown in the script, its spherical body is attached to one end of the bracket and the bracket 15 is then pulled through the slot of one main body until it abuts against the bearing surface. Then the elongate member is screwed to said first main body. The elongate member is now passed through one of two holes drilled in the mesh diametrically opposite each other. After placing a spherical body attached to the end of a second bracket against the bearing surface of another main element, the second main element is inserted into the second opening in the mast and screwed onto the other end of the elongated element. The latter fastening of the second main element is made more difficult by the fact that the second vane extends out of this, whereby the said bracket must be pivoted around or constantly held coaxially with the second main element while screwing it on.

Formålet med opfindelsen er at anvise et fastgørelsesarrangement af den indledningsvis 25 nævnte art, som er montagevenligt og muliggør en anbringelse af stag og vant, efter at hovedparten af elementerne er monteret på masten.The object of the invention is to provide a fastening arrangement of the kind mentioned above, which is easy to mount and allows for the placement of braces and vanes after the majority of the elements are mounted on the mast.

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Til opnåelse af dette formål er fastgørelsesarrangementet ifølge opfindelsen ejendommelig ved, at slidsen strækker sig diametralt gennem hovedelementet og aksialt frem til hovedelementets ydre ende og har en over for lejefladen beliggende indføringsåbning, som muliggør indføring af legemet i hovedelementets indre ændret til at lejre dets sfæri-5 ske hoved på lejefladen, og at der på et ydre endeområde af hovedelementet løsbart er fastgjort et broelement, som strækker sig på tværs af slidsen. Herved kan det aflange element og hulelementet indledningsvis fastgøres til masten. Med broelementer fjernet fra hovedelementet føres vantet aksialt ind i slidsen, hvorefter legemet gennem indføringsåbningen føres frem til anlæg mod lejefladen. Sluttelig fastgøres broelementet, 10 som på grund af dets fastgørelse til hovedelementets endeområde forhindrer en udvidelse af slidsen ved belastning af hovedelementet.To achieve this purpose, the fastening arrangement according to the invention is characterized in that the slot extends diametrically through the main element and axially to the outer end of the main element and has an inlet opening located opposite the bearing surface which allows insertion of the body into the interior of the main element altered to enclose its sphere. 5, on the bearing surface, and that on an outer end region of the main element a bridging element extending transversely of the slot is detachably attached. In this way, the elongate element and the hollow element can initially be attached to the mast. With bridging elements removed from the main element, the miter is axially inserted into the slot, after which the body is guided through the insertion opening to abut the bearing surface. Finally, the bridging element 10 is fastened, which, due to its attachment to the end region of the main element, prevents an extension of the slit by loading the main element.

Ifølge opfindelsen kan broelementet være forsynet med et fremspring, som strækker sig ind i slidsen og har en bredde i al væsentligt svarende til slidsens bredde. Herved forhindres en formindskelse af slidsens bredde og derved en fastklemning af legemet i hovede-15 lements indre.According to the invention, the bridging element can be provided with a projection which extends into the slit and has a width substantially corresponding to the width of the slit. This prevents a reduction in the width of the slot and thereby a clamping of the body in the interior of the main body.

Fremdeles kan ifølge opfindelsen fremspringet i al væsentligt strække sig frem til legemets sfæriske hoved.Still, according to the invention, the projection can extend substantially to the spherical head of the body.

Desuden kan ifølge opfindelsen indføringsåbningen være anbragt aksialt forsat i udadgående retning i forhold til lejefladen, og broelementets fremspring strække sig således ind 20 i slidsen, at det forhindrer, at legemet kan forlade hovedelementet gennem indføringsåbningen, når broelementet er fastgjort til hovedelementet.In addition, according to the invention, the insertion opening may be arranged axially outwardly with respect to the bearing surface, and the protrusion of the bridge element extends such that it enters the slit to prevent the body from exiting the main element through the insertion opening when the bridge element is attached to the main element.

Endvidere kan ifølge opfindelsen fastgørelsen af broelementet til hovedelementet være sikret af et løsbart låseorgan, såsom en skrue, en låsestift eller klemstift.Furthermore, according to the invention, the attachment of the bridging element to the main element can be secured by a detachable locking means, such as a screw, locking pin or clamping pin.

Desuden kan ifølge broelementet udgøres af en hætte, som er i omsluttende indgreb med 25 nævnte endeområde af hovedelementet.Furthermore, according to the bridging element, it can be constituted by a cap which is in enclosing engagement with said end region of the main element.

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Ved ovennævnte udførelsesform for opfindelsen kan hætten have et indre gevind, som er i indgreb med et tilsvarende ydre gevind på hovedelementets endeområde. Hætten kan fordelagtigt være forsynet med et centralt anbragt fremspring med et cirkulært tværsnit.In the above embodiment of the invention, the cap may have an inner thread which engages a corresponding outer thread at the end region of the main element. Advantageously, the cap may be provided with a centrally located projection having a circular cross-section.

Yderligere kan ifølge opfindelsens centrum af hovedelementets sfæriske lejeflade være 5 beliggende tæt ved mastens ydre overflade. Herved opnås, at på vantet virkende kræfter overføres til masten i alt væsentligt som trykkræfter.Furthermore, according to the center of the invention, the spherical bearing surface of the main element may be located close to the outer surface of the mast. Hereby it is obtained that the forces acting on the winch are transferred to the mast essentially as compressive forces.

Endvidere kan ifølge opfindelsen legemets sfæriske hoved i hovedsagen have samme radius som hovedelementets sfæriske lejeflade. Herved opnås et så stort anlægsareal som muligt mellem legemets sfæriske hoved og lejefladen.Furthermore, according to the invention, the spherical head of the body can generally have the same radius as the spherical bearing surface of the main element. This results in as large a plant area as possible between the spherical head of the body and the bearing surface.

10 Fremdeles kan ifølge opfindelsen, der til det aflange elements anden ende, være fastgjort et andet hovedelement, som er identisk med det første hovedelement, der er fastgjort til det aflange elements ene ende, og de to hovedelementer være fastgjort til det aflange element ved hjælp afen gevindforbindelse. Endelig kan i forbindelse med ovennævnte udførelsesform for opfindelsen hvert hovedelement have et egentligt hoved med en 15 skulder, der ligger an mod mastens ydre overflade, og et skaft, som har mindre diameter end hovedet og strækker sig ud fra dette, hvilket skaft passer tæt ind i et hul i masten og er gevindforbundet med den pågældende ende af det aflange element i mastens indre.10 According to the invention, which can be attached to the other end of the elongate member, another main element identical to the first main element attached to one end of the elongate element and the two main elements can be secured to the elongate element by means of the invention. of threaded connection. Finally, in connection with the above embodiment of the invention, each main element may have an actual head having a shoulder abutting the outer surface of the mast and a shaft having a smaller diameter than the head and extending therefrom, which shaft fits snugly in a hole in the mast and is threadedly connected to that end of the elongate member of the mast interior.

Opfindelsen forklares nærmere nedenfor under henvisning til tegningen, hvor: fig. 1 viser skematisk, og set skråt forfra i perspektiv, en båd med en mast, hvorpå 20 fastgørelsesarrangementet ifølge opfindelsen er anvendt, fig. 2 viser i større målestok og set i perspektiv et område af en mast, hvorpå fastgørelsesarrangementet ifølge opfindelsen er anvendt, DK 173794 B1 4 fig. 3 et delsnit efter linien III-III i fig. 2, og fig. 4A, B, C et hovedelement hørende til fastgørelsesarrangementet ifølge opfindelsen set i retningerne, henholdsvis IVA, IVB, IVC i fig. 3.The invention is explained in more detail below with reference to the drawing, in which: FIG. Figure 1 is a diagrammatic perspective view of a boat with a mast on which the fastening arrangement according to the invention is used; 2 shows, on a larger scale and in perspective, an area of a mast on which the fastening arrangement according to the invention is used; FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIG. 4A, B, C are a main element of the fastening arrangement according to the invention seen in the directions IVA, IVB, IVC respectively in FIG. Third

Idet der henvises til fig. 1 er der med henvisningstallet 1 indikeret et fastgørelsesarrange-5 ment ifølge opfindelsen til fastgørelse af et styrbords undervant 2 og et bagbords under-vant 2’ til en sejlbåds 3 mast 4. Det styrbords undervant 2 og det bagbords undervant 2’ er på sædvanlig måde fastgjort til skibets skrog via en ikke-vist vantskrue. Fastgørelsesarrangementet ifølge opfindelsen kan også benyttes til fastgørelse af de viste diagonalvant 5,5',6,6’ og topvant 7,7’ til masten 4 samt til fastgørelsen af andre vant eller stag 10 til masten, således som indikeret.Referring to FIG. 1, reference numeral 1 indicates an attachment arrangement 5 according to the invention for attaching a starboard underwater 2 and a backboard underwater 2 'to a sailboat 3 mast 4. The starboard underwater 2 and the backboard underwater 2' are in the usual manner. attached to the hull of the ship via a water screw not shown. The fastening arrangement according to the invention can also be used for attaching the diagonal guards 5,5 ', 6,6' and top guards 7,7 'to the mast 4 as well as for the attachment of other vanes or bars 10 to the mast, as indicated.

Idet der henvises til fig. 2 til 4 er fastgørelsesarrangementet eller beslaget 1 vist omfattende et aflangt element 8, som strækker sig på tværs af masten 4, som er hul og fremstillet af letmetal, såsom aluminium, eller kulfiberarmeret harpiks. Et første hovedelement 9 er skruet på en første ende 10 af det aflange element 8. Et tilsvarende andet 15 hovedelement 11 er skruet på det aflange elements 8 anden ende 12. Hvert af hovedelementerne 9, 11 har en udvidet del eller et hoved 13 og et skaft 14. Mellem skaftet 14 og hovedet 13 er der en skulder 15. Hovedelementernes 9, 11 skafter 14 er ført igennem hver sit diametralt over for hinanden liggende hul 16, 17 i masten 4. Skafterne 14 har en tæt pasning med hullerne 16, 17. Hovedelementet 9 er påskruet det aflange elements 20 8 første ende 10 ved hjælp af et indvendigt gevind 18 i et bundhul i skaftet 14 og et udvendigt gevind 19 på skaftenden 10. Det andet hovedelement 11 er på tilsvarende måde fastgjort til det aflange elements 8 anden ende 12. Hovedelementets 9 skulder 15 er i indgreb med mastens 4 ydre overflade 20. På tilsvarende måde er det andet hovedelements 11 skulder i indgreb med mastens overflade.Referring to FIG. 2 to 4, the fastener or bracket 1 is shown comprising an elongate member 8 extending across the mast 4 which is hollow and made of light metal such as aluminum or carbon fiber reinforced resin. A first main element 9 is screwed onto a first end 10 of the elongate element 8. A corresponding second 15 main element 11 is screwed to the second end 12. Of the elongate element 8, each of the main elements 9, 11 has an extended part or a head 13 and a shaft 14. Between the shaft 14 and the head 13 is a shoulder 15. The shafts 14 of the main elements 9, 11 are passed through each of their diametrically opposite holes 16, 17 in the mast 4. The shafts 14 have a close fit with the holes 16, 17 The main member 9 is screwed to the first end 10 of the elongated member 20 8 by means of an internal thread 18 in a bottom hole of the shaft 14 and an external thread 19 of the shaft end 10. The second main member 11 is similarly secured to the second elongated member 8. end 12. The shoulder 15 of the main member 9 engages the outer surface 20. of the mast 4. Similarly, the shoulder of the second main member 11 engages the surface of the mast.

25 Da hovedelementerne 9, 11 som nævnt er identiske, vil kun hovedelementet 9 blive beskrevet i det følgende. Som det tydeligst fremgår af Fig. 3 og 4, er hovedelementets DK 173794 B1 5 9 hoved 13 opslidset ved hjælp af en diametralt gennemgående slids 21, som aksialt strækker sig frem til hovedets 13 ydre ende 22. Slidsen 21 har en bredde, der kun er lidt større end vantets 2 diameter. I hovedets indre er der tildannet en sfærisk lejeflade 23, som er symmetrisk om slidsens diametralplan. Det sfæriske lejeflade 23 tjener som 5 lejeflade for et sfærisk hoved 24 af et rotationssymmetrisk legeme, en såkaldt stemball, som har et skaft og er forsynet med en aksial gennemgående boring. Nævnte stemball 25 er forbundet med vantets 2 ydre ende ved, at denne er ført gennem stemball’ens 25 boring og dets ydre ende stukket som vist ved henvisningstallet 26. Det skal bemærkes, at nævnte monteringsprincip benyttes ved massive vant, såkaldte rodvant, og at der til 10 vant af metalwire benyttes et andet fastgørelsesprincip.As the main elements 9, 11, as mentioned, are identical, only the main element 9 will be described below. As can be seen most clearly in FIG. 3 and 4, the head 13 of the main member is slotted by a diametrically through slot 21 which extends axially to the outer end of the head 13. The slot 21 has a width which is only slightly larger than the diameter of the mitt 2. . In the interior of the head a spherical bearing surface 23 is formed which is symmetrical about the diametral plane of the slot. The spherical bearing surface 23 serves as a bearing surface for a spherical head 24 of a rotationally symmetrical body, a so-called stem ball having a shaft and provided with an axial through bore. Said plunger 25 is connected to the outer end of the plunger 2 by passing through the bore of the plunger 25 and its outer end as shown by reference numeral 26. It should be noted that said mounting principle is used in solid wadding, so-called root roll, and that another 10 principle of fastening is used for 10 wires of metal wire.

For at kunne optage stemball'ens 25 skaft og tillade forskellige vinkelstillinger af staget i forhold til masten, fortrinsvis i området 6 til 30°, er slidsen i området ved lejefladen 23 udvidet ved hjælp af en i aksial retning aflang åbning 27, som fra hovedets 13 ydre overflade strækker sig radialt indad mod lejefladen 23. Diametralt overfor lejefladen 23 15 er hovedet 13 forsynet med en indføringsåbning 28, som gør det muligt at føre stem-ball'ens 25 hoved 24 ind i anlæg med lejefladen 23. Indføringsåbningen 28 har i aksial retning aflang form og består af en første radial boring 29, som strækker sig frem til lejefladen 23, og som i hovedelementets 9 aksiale retning strækker sig et lille stykke ned i dettes skaft 14, og en i udadgående retning i forhold hertil aksialt forsat anden boring 20 30 med kortere radial dybde end den første boring 29. Den anden radiale boring 30 har en sådan radial dybde, at det efter at vantet 2 er indført aksialt i slidsen 21, er muligt at føre stemball'ens 25 hoved 24 ind i anlæg med lejefladen 23 ved først radialt at indføre stemball'ens 25 hoved 24 i indføringsåbningens 28 anden boring 30, dernæst i aksial indadgående retning ned i den første boring og sluttelig forskyde stemball’en.In order to receive the stem of the stem 25 and allow different angular positions of the rod relative to the mast, preferably in the region of 6 to 30 °, the slot in the region of the bearing surface 23 is extended by an axially extending aperture 27 extending from the head of the head. 13 outer surface extends radially inwardly against the bearing surface 23. Diametrically opposite the bearing surface 23 15, the head 13 is provided with an insertion opening 28, which makes it possible to insert the head 24 of the stem ball 25 into abutment with the bearing surface 23. The insertion opening 28 has axial direction elongate and consists of a first radial bore 29 extending to the bearing surface 23 and extending in the axial direction of the main element 9 a small distance down its shaft 14, and an outwardly extending axially relative thereto. bore 20 30 of shorter radial depth than the first bore 29. The second radial bore 30 has such radial depth that after the mitt 2 is inserted axially into the slot 21, it is possible t introducing the head 24 of the piston 25 into abutment with the bearing surface 23 by first radially inserting the head 24 of the piston 25 into the second bore 30 of the inlet aperture 28, then axially inwardly into the first bore and finally displacing the piston ball.

25 Med henblik på at forhindre en utilsigtet ophævelse af forbindelsen mellem hovedelementet 9 og stemball'en 25 og dermed vantet 2, har hovedelementets 9 hoved 13 et ydre med gevind forsynet endeområde 31, hvorpå der omsluttende er påskruet en hætte 32 med et indre gevind. Gevindingrebet mellem hætten 32 og inderområdet 31 forhindrer DK 173794 B1 6 en udvidelse af slidsen 21. Hætten 32 har en bundvæg, hvori der koncentrisk og med samme indbyrdes afstand er dannet et antal gennemgående huller, i det viste tilfælde seks huller 34. Disse huller 34 tjener to formål, nemlig dels som indgrebsåbninger for en tang med diametralt over for hinanden liggende tappe til brug ved fastspænding af hætten og 5 dels som indføringsåbning for en klemstift 36. Denne klemstift 36 indføres efter fastspænding af hætten på hovedelementet 9 i et hul, som er beliggende i slidsen 21. Herved forhindres en afskruning af hætten. Hætten 32 er endvidere forsynet med en centralt udragende cylindrisk tap 35, som har en diameter i al væsentligt svarende til slidsens 21 bredde. Tappen 35 forhindrer derved en sammenpresning af slidsen. Tappen 35 strækker 10 sig i indadgående retning i al væsentligt frem til stemball'ens 25 hoved 24, når dette er lejret på lejefladen 23. Tappen 25 tjener herved også til at forhindre, at stemball'en 24 kan føres ud af hovedelementets 9 indre på en måde modsat den ovenfor beskrevne indføringsmåde.In order to prevent the unintentional termination of the connection between the main member 9 and the piston 25 and thus the winch 2, the head 13 of the main member 9 has a threaded end region 31 on which a cap 32 with an internal thread is finally screwed on. The threaded rope between the cap 32 and the inner region 31 prevents the expansion of the slot 21. The cap 32 has a bottom wall in which a number of through holes are formed concentrically and with equal spacing, in the case shown six holes 34. These holes 34 serves two purposes, namely, as engagement openings for pliers with diametrically opposite pins for use in clamping the cap, and 5 as an insertion opening for a clamping pin 36. This clamping pin 36 is inserted after clamping the cap on the main member 9 in a hole which is located in the slot 21. This prevents the cap from being screwed off. The cap 32 is further provided with a centrally projecting cylindrical pin 35 having a diameter substantially equal to the width of the slot 21. The pin 35 thereby prevents compression of the slot. The pin 35 extends inwardly substantially to the head 24 of the piston 25 when mounted on the bearing surface 23. The pin 25 thereby also serves to prevent the piston 24 from being projected out of the interior of the main member 9 a manner opposite to the insertion method described above.

Opfindelsen kan ændres på mange måder, uden at der blev afvist fra dens idé. Således 15 kan et af hovedelementerne være fast forbundet eller tildannet ud i ét med det aflange element i stedet for som beskrevet være forbundet med dette ved hjælp af en gevindforbindelse. Yderligere kan det ene hovedelement udgøres af et simpelt bolt- eller møtrikhoved, såfremt blot et enkelt stag eller vant skal fastgøres til masten ved hjælp af fastgørelsesarrangementet ifølge opfindelsen. Endelig kan der i stedet forden beskrevne og 20 viste stemball benyttes et i hovedsagen kugleformet legeme med en diametral boring til optagelse af vantet.The invention can be changed in many ways without being rejected from its idea. Thus, one of the main members may be firmly connected or formed integrally with the elongate member, rather than as described, being connected thereto by a threaded connection. Further, one of the main members may be a simple bolt or nut head, if only a single rod or vane is to be secured to the mast by means of the fastening arrangement according to the invention. Finally, instead of the previously described and illustrated stem ball, a generally spherical body with a diametrical bore can be used to receive the mitt.

Claims

An attachment arrangement (1) for attaching stays and vanes (2) to a boat mast (4), comprising: 5. an elongate element (8) extending transversely of the mast (4) and attached thereto; a main member (9) attached to one end (10) of the elongate member (8) and having a generally spherical inner bearing surface (23) and a slot extending through the main member (9) to the bearing surface (23); has a width at least equal to the diameter of the bracket or mitt and a body (25) arranged in the main element (9) with a at least partially spherical head (24) adapted to abut the bearing surface (23), which body is disposed about the end of a rod or vane (2) extending through the slot, characterized in that the slot (21) extends diametrically through the main member (9) and axially to the outer end of the main member (9). 22) and has an insertion opening (28) located opposite the bearing surface (23), which allows insertion of the body (25) in the interior of the main element (9) for mounting its spherical head (24) on the bearing surface (23) and that on an outer end region (31) of the main element (9) a bridging element (32) is extensably attached which extends 20 across the slot,

Fastening arrangement according to claim 1, characterized in that the bridging element (32) is provided with a projection (35) which extends into the slit and has a width substantially corresponding to the width of the slit. DK 173794 B1 8

Fastening arrangement according to claim 1 or 2, characterized in that the insertion opening is arranged axially outwardly in relation to the bearing surface (23) and the projections (35) of the bridge elements (32) extend into the slot (21) to prevent it. the body (25) being able to leave the main element (9) through the insertion opening 5 (28) when the bridging element (32) is arranged on the main element (9).

Fastening element according to one or more of the preceding claims, characterized in that the fastening of the bridging element (32) to the main element (9) is secured by a removable locking means, such as a screw, a locking pin or a clamping pin (36). .

Fastening element according to one or more of the preceding claims, characterized in that the bridging element (32) is constituted by a cap which is in enclosing engagement with said end region (31) of the main element (9).

Fastening element according to claim 5, characterized in that the cap has an internal thread which engages a corresponding outer thread on the end region (31) of the main element (9).

Fastening arrangement according to claim 1, characterized in that the center of the spherical bearing surface (23) of the main element (9) is located close to the outer surfaces (20) of the mast (4).

Fastening arrangement according to one or more of the preceding claims, characterized in that the spherical head (24) of the body (25) has substantially the same radius 20 as the spherical bearing surface (23) of the main element (9).

Fastening arrangement according to one or more of the preceding claims, characterized in that at the other end (12) of the elongate element (8) is attached to another main element (11) which is identical to the main element (9) which is attached to one end of said elongate element (8) and that the two main elements (9, 11) are fixed to the elongate element (8) by means of a threaded connection.

Fastening arrangement according to claim 9, characterized in that each main element (9, 11) has an actual head (13) which abuts the outer surface (20) of the mast (4) and a shaft (14) which has smaller diameter than the head (13) and extending therefrom, which shaft (14) fits snugly into a hole (16, 17) in the mast (4) and is threadedly connected to the respective end (10, 12) of the elongate member ( 8) in the interior of the mast.