EP2052962A2 - Wishbone head piece - Google Patents

Abstract

The piece has a clamping collar (2) encompassing a pole in sections and attached from an opening position into a closing position by a clamp lever (6) and a clamping/gripping rope end unit (8), where one of the sections of the pole is encompassed in the closing position. A clamp (4) carries the clamping collar, and is connected with end sections of wishbone fork tree beams (14, 16). A booster (18) extends in a longitudinal direction of the collar, where the booster is made of bending-resistant material and arranged between the clamping collar and the clamp.

Description

The invention relates to a boom head piece for a Surfrigg according to the preamble of claim 1 and a boom with such a boom head piece.

In a Windsurfrigg a sail is pushed with a mast pocket along a luff on a mast and the sub-leech and the leech stretched by means of a boom. This is attached via a boom head piece on the mast. Such a boom head piece is, for example. In the DE 38 01 682 C2 or in the DE 20 2005 018 027 described. In these known solutions, the head piece has a clamping sleeve, which encompasses a peripheral portion of the mast and can be acted upon by a clamping ramp with a clamping force, so that the head piece is held non-positively on the outer circumference of the mast. The clamping of the clamping ramp is done, such as in the above DE 20 2005 018 029 described, often on a lever acting like a toggle lever.

In modern Surfriggs it is desirable that the boom in the vertical axis, ie in the direction of the mast longitudinal axis has a certain flex, so that the boom can be pivoted upwards or downwards. In the aforementioned solution according to the DE 38 01 682 C2 This flex can be made possible only by the boom spars themselves or by twisting the clamping sleeve. However, this twisting of the clamping sleeve is undesirable because it can be damaged at high wind forces and further the reliable connection of the boom to the mast is not guaranteed, so that the surfer generated by the control movements are not exactly transferable to the Surfrigg and accordingly a performance Waste in strong winds can occur.

In the DE 20 2005 018 029 It is proposed to minimize this uncontrolled distortion of the clamping sleeve by means of a rigid, integrated into the boom head piece support shell. This design allows a very stiff connection between the boom and mast, the support shell is optimized only for a specific mast geometry. When changing the mast diameter, the support shell must be adjusted accordingly. Furthermore, it is desired to have the stiffness the clamping sleeve to different operating conditions, for example, the surfer weight, the wind force to adjust the wave height and the sail area.

The invention has for its object to provide a boom head piece that is easily adaptable to different conditions of use.

This object is achieved by a boom head with the features of claim 1 and by a running with such a boom head piece boom.

According to claim 1, the boom piece is designed with a clamping sleeve which can be brought by means of a clamping lever and a clamping means from an open position to a closed position in which a peripheral portion of the mast is encompassed by the clamping sleeve. The clamping sleeve is carried in the boom head piece according to the invention by a clamp, which is connectable to end portions of boom tubes. According to the invention, the boom head piece has a Flexverstelleinrichtung that allows a Flexverstellung depending on the above-mentioned conditions of use, eg. Surfer weight, wind strength, wave height, sail area, the personal preference of the surfer, etc. By means of this Flexverstelleinrichtung the flex of the boom can be selectively adjusted in mast longitudinal direction, so that optimal control is guaranteed.

The Flexverstelleinrichtung is preferably formed by a arranged on the clamping sleeve booster, which extends in the mast or cuff longitudinal direction and consists of relatively rigid material.

It is preferred to carry out the booster and the clamping sleeve with a plurality of fastening recesses for insertion of fastening means, so that in dependence on the positioning of the fastening means of the flex is variable.

In a particularly simple embodiment, in each case two in the sleeve longitudinal direction on both sides of a plane spanned by the boom spars plane overlying breakthroughs are provided.

This booster tapers in one embodiment towards its two end portions.

In a preferred embodiment, the booster is designed with a connecting piece of the clamp sections enclosing base part. From this, extending towards the cuff two support struts, the end portions of the clamping sleeve abut to stiffen them in the mast longitudinal direction and thus to influence the flex.

This base part is preferably designed with a flat support, which extends transversely to the mast or sleeve longitudinal axis and rests against correspondingly shaped mounting portions of the clamping sleeve.

In this case, these attachment portions are preferably designed such that the flat support extends tangentially to the sleeve circumference.

The preparation of the booster is preferably carried out by injection molding, wherein fiber-reinforced plastic is used with high bending stiffness.

In an alternative solution, the flex adjustment takes place via a preload rubber mount between the clamping sleeve and the clamp.

When the boom head piece, it is preferred if a the cuff head and the flap assembly cross-section of the clamping means and / or the clamping element is each U-shaped, so that the clamping force over a comparatively wide (seen in the axial direction of the mast) area can be applied.

In one embodiment of the invention, the clamping lever is designed with a storage space can be stowed in the end portions of the clamping means, so that the function of the boom head piece is not hindered and the aesthetic appearance is improved.

This storage space is preferably arranged in a region covered by a wall of the clamping lever to the outside.

In some types of sail, for example in Wavesegeln comparatively thin masts are used. To adapt to such thin masts the boom head piece can be provided with an adapter which is releasably attached to the clamping sleeve and thus allows the use of such thin poles.

This releasable attachment is done for example by means of a rotary closure.

The production of the individual parts of the variable boom head piece is preferably carried out by injection molding.

For the sake of good order, it should be pointed out that the features of the subclaims can be combined in any manner with the feature combinations of the independent claims per se.

• Figur 1 eine Draufsicht auf ein erstes Ausführungsbeispiel eines Gabelbaumkopfstück eines Gabelbaums für ein Surfrigg;
• Figur 2 eine Ansicht auf eine geöffnete Klemmmanschette des Gabelbaumkopfstücks aus Figur 1;
• Figur 3 eine Schrägansicht des Gabelbaumkopfstücks aus Figur 1;
• Figur 4 eine Seitenansicht des Gabelbaumkopfstücks aus Figur 1;
• Figur 5 eine Ansicht von vorne (in Surfrigglängsrichtung gesehen) auf das Gabelbaumkopfstück aus Figur 1;
• Figur 6 eine Einzeldarstellung eines Boosters des Gabelbaumkopfstücks aus Figur 1;
• Figur 7 einen Schnitt durch das Gabelbaumkopfstück zur Verdeutlichung der Montageposition des Boosters gemäß Figur 6;
• Figur 8 eine Vorderansicht eines zweiten Ausführungsbeispiels eines Gabelbaumkopfstückes;
• Figur 9 eine Draufsicht auf das Gabelbaumkopfstück aus Figur 8;
• Figur 10 eine Schrägansicht in teilweiser Explosionsdarstellung des Ausführungsbeispiels gemäß Figur 8 und
• Figur 11 eine Rückansicht in teilweiser Explosionsdarstellung dieses Ausführungsbeispiels.

Preferred embodiments of the invention are explained in more detail below with reference to schematic drawings. Show it:

• FIG. 1 a plan view of a first embodiment of a boom head piece of a boom for a Surfrigg;
• FIG. 2 a view of an open clamp of the boom head piece FIG. 1 ;
• FIG. 3 an oblique view of the boom head piece FIG. 1 ;
• FIG. 4 a side view of the boom head piece FIG. 1 ;
• FIG. 5 a view from the front (seen in Surfrigglängsrichtung) on the boom head piece FIG. 1 ;
• FIG. 6 an individual view of a booster of the boom head piece FIG. 1 ;
• FIG. 7 a section through the boom head piece to illustrate the mounting position of the booster according to FIG. 6 ;
• FIG. 8 a front view of a second embodiment of a boom head piece;
• FIG. 9 a plan view of the boom head piece FIG. 8 ;
• FIG. 10 an oblique view in partial exploded view of the embodiment according to FIG. 8 and
• FIG. 11 a rear view in partial exploded view of this embodiment.

The FIGS. 1 to 7 show a first embodiment of a head piece 1, a boom for a windsurf rig. Such a boom has two about a Elipse spanning boom spars, which extend on both sides of the sail from the mast to the clew. The clew-side end portion of the boom is formed by a Gabelbaumendstück, in which a Talje is integrated, can be trimmed on the lower and leech. The attachment of the boom via the head piece 1, wherein in the sail and in the mast pocket a recess is provided which is penetrated by the head piece 1 of the boom so that it can attack directly on the mast.

According to FIG. 1 the head piece 1 consists essentially of an asymmetric clamping sleeve 2, which is fastened to a clamp 4 and which can be acted upon by a clamping lever 6 with a clamping force. The clamping sleeve 2 surrounds a peripheral portion of the mast, wherein the clamping force is transmitted via a dash-dotted lines indicated clamping lamps 8 from the clamping lever 6 on the clamping sleeve 2. The clamp 4 is penetrated by a connecting piece 10, in whose, protruding from the clamp 4, curved end portions indicated by dashed lines boom spars 14, 16 are used or placed.

In the illustrated embodiment, the clamping sleeve 2 in the axial direction, d. H. stiffened in the longitudinal direction of the mast by means of a stiffening part, which is hereinafter referred to as booster 18. This allows a variable adjustment of the longitudinal stiffness of the clamping sleeve 2, so that the flex of the boom is adjustable depending on the conditions of use and personal preference.

The one with a cylindrical middle part and the two in FIG. 1 curved connecting portions 10 for the boom bows 14, 16 is partially encompassed by the clamp 4 sections. This has in the presentation according to the FIGS. 1 . 3 and 5 a designed as a half-shell base 20 which engages the straight extending central portion of the connecting piece 10 in sections. On the base 20, two fastening tab pairs 22, 24 are formed on both sides, which in FIG. 2 are particularly well recognizable. In the plan view according to FIG. 1 the two fastening tab pairs 22, 24 form with the base 20 a U.

The clamping sleeve 2 is attached to the mounting tab pairs 22, 24, wherein the two tabs of each pair have a laterally projecting mounting portion 26 and 28 (see FIG. 2 ) surround the clamping sleeve 2. The attachment can be done, for example, via fastening screws or rivets, not shown in the figures.

The clamping sleeve 2 consists in the described embodiment substantially of a cylinder-segment-shaped sleeve head 30, on the outer circumference of the two aforementioned, approximately in the tangential direction extending mounting portions 26, 28 are formed. The collar head 30 is made of a comparatively flexible material, at least on the in FIG. 1 to the viewer indicative masttopseitigen end portion with a break-resistant insert 32, for example, is reinforced from carbon fiber. But the sleeve head 30 may also consist of high-strength material, so that can be dispensed with the insert 32. In the illustrated embodiment, the sleeve head 30 is arranged asymmetrically to the boom center axis, wherein the in FIG. 1 Right arranged peripheral portion continues around the mast as the other flap-side end portion.

At the in the FIGS. 1 to 4 left longitudinal edge of the cuff head 30 is a in FIG. 4 hinged well visible flap 34. For this purpose, two coaxial and spaced-apart joint projections 36, 38 are formed on the adjacent longitudinal edge of the sleeve head 30, which are encompassed by a joint receptacle of the flap 34, wherein a joint middle part 40 (see esp. FIG. 4 ) is disposed between the two hinge projections 36, 38 and two pivot pins 42, 44 axially adjoin the end portions of the hinge projections 36, 38 so that they are encompassed by the flap 34 in the axial direction. The hinge forming components 36, 38; 40, 42, 44 of the sleeve head 30 and the flap 34 are penetrated by a common longitudinal bore into which a hinge pin or the like is inserted, so that the flap 34 with respect to the collar head 30 is pivotable.

The flap 34 is formed from a comparatively flexible material which adapts to the outer contour of the mast when the clamping force is applied, so that the clamping collar 2 adapts itself practically to different mast diameters. On the flap 34 made of a comparatively high-strength, rigid material hook member 46 is fixed, which has on its side remote from the flap 34 longitudinal edge a hook 48 for mounting the clamping tamp. 8 The hook portion 46 has in the illustration according to the FIGS. 1 . 3 and 4 an approximately U-shaped Assembly with the hook 48 as a base and with two extending therefrom sliding lugs 50, 52. These are each guided along a guide 54, 56 in the circumferential direction. In this case, the sliding lugs 50, 52 lie on the overlapping large area (see FIG. 4 ) of the flap 34 and are secured in the radial direction outwardly by securing tabs 58. As esp. From FIG. 1 results, the flap 34 and the hook portion 46 in the view according to FIG. 1 In approximately the same, predetermined by a mean diameter diameter radius of curvature of the sleeve head 30, so that both components 34, 46 can lie flat against the outer circumference of the mast. The adaptation to the diameter and thus the correspondingly varying outer circumference of the mast is achieved by displacement of the hook portion 46 along the circumferential guide 54, 56. This Relativverschieblichkeit also ensures that the forces are substantially absorbed by the clamping lamps 8. To reduce weight, the flap 34 is designed approximately centrally with a recess 58.

The tensile forces applied via the clamping ramps 8 suspended in the hooks 46 are transmitted to the collar head 30 via an additional tensioning element. In the illustrated embodiment, a slippery clamping element, for example. A Tampen 60 is used for this purpose, in the illustration according to FIG. 4 dash-dotted line is drawn. For fixing this tamp 60 a hollow-cylindrical fastening eyelet 62 is formed on the peripheral portion of the collar head 30 adjacent to the connection of the flap 34, which in FIG. 4 is particularly visible. According to FIG. 1 the clamping yoke 62 is within the area encompassed by the two fastening strap pairs 22, 24 and extends in the mast longitudinal direction beyond the two fastening tab pairs 22, 24 so that the clamping ear 62 is accessible from the front side, ie in the mast longitudinal direction, from the mast base or from the mast top is. The rope 60 is threaded into the clamping ear 62 and the two end portions, as in FIG. 4 indicated, then deflected in the circumferential direction, so that they overstretch the flap 34 along the two guides 54, 56 and the therein included sliding tabs 50, 52 of the hook portion 46. In the transition region of the sliding lugs 50, 52 to the hook 48 are on the hook part respectively in FIG. 4 towards the viewer projecting eyelets 66, 68 formed, which are penetrated by the end portions of the clamping element 60 which are defined by means of knots or other securing elements in the pulling direction. By changing the length of this clamping element 60 can then according to the relative position of the sliding plates 50, 52 in the associated guides 54, 56 and thus the circumferential length of the flap assembly (consisting of flap 34 and hook member 46) are changed. In this way, an extremely simple, high-tensile adaptation to different Mast diameter allows, the flexurally elastic design of the clamping member 34 additionally improves the adaptation to different mast diameter.

As can be seen in particular from the FIGS. 1 . 3 and the rear view according to FIG. 5 shows, at the mounting tab pair 24 associated outer peripheral portion of the diaphragm head 30, a further eyelet 70 is formed, the positioning and geometry of the clamping ear 62 corresponds. This eyelet 70 has no function in the illustrated embodiment.

The booster 18 is in FIG. 6 shown in single representation. Accordingly, the booster 18 has an approximately half-shell-shaped, designed as a cylinder segment base member 74, of which approximately in the tangential direction two support struts 76, 78 extend, which are each tapered towards its end portions. The base part 74 is at its in FIG. 6 executed by the viewer groundbreaking back with a cover pad 80, with which it in the mounted state (see in particular the FIGS. 1 and 7 ) rests on the also plan running, the connection piece 10 facing rear surfaces of the mounting portions 26, 28 of the sleeve head 30. This is in particular the representation according to FIG. 7 clearly, a section along the line AA in FIG. 2 shows. It can be seen from this representation that the flat support 80 of the booster 18 rests flat on the tangential to the cylindrical surface of the cuff head 30 extending mounting portions 26, 28 and the intermediate peripheral regions of the sleeve head 30. In the mounting position, the base part 74 surrounds the connecting piece 10 in sections, wherein the in FIG. 6 overlap the viewer facing longitudinal edges of the base member 74 with the corresponding peripheral walls of the base 20 of the clamp 4. The two support struts 76, 78 are arched away from the base part 74 towards the cuff head 30, so that the end sections of the support struts 76, 78 lie flat against the circumferential region of the cuff head 30 arranged between the attachment strap pairs 22, 24. As shown in the Figures 5 and 6 In this exemplary embodiment, two continuous recesses 82, 84 are formed on each support strut 76, 78, to which corresponding openings 86, 88 in the cuff head 30 are assigned. These are in particular in the illustration according to FIG. 2 visible, noticeable. In these recesses, breakthroughs 82, 84; 86, 88 can be used fasteners, such as clamping screws, via which the two end portions 76, 78 of the booster 18 are attached to the sleeve head 40 so that it is stiffened in the mast longitudinal direction. Depending on the choice of attachment point can be a small flex in the mast longitudinal direction (vertical axis) (outer attachment points 88, 84) or a large flex (inner attachment points 84, 86) can be adjusted, with upwards (towards the mast top) and down (to the mast base) a different Flex is adjustable. The booster 18 is made of a high strength material, such as glass fiber reinforced plastic, so that by choosing the geometry of the support struts 76, 78 and by choosing the attachment points an extremely variable flex adjustment is possible, with an adaptation to different conditions (surfer weight, wind strength, Sail area, waves, etc.) is possible. The booster 18 is connected to the clamp 4 and encloses together with this the central part of the connecting piece. The clamping lever 6 is designed in a conventional manner as a toggle lever, wherein two short legs 90, 91 of the clamping lever, the fastening tab pair 24 engage around on both sides (see FIG. 3 ) and are connected thereto by means of a pivot joint 92. The two short legs 90, 92 of the clamping lever 6 are provided with an approximately half-shell-shaped handle 94 which is lifted in the illustrated open position of the clamp 4 and is seated in the clamping position on this and thereby partially engages (not shown). The lateral flex, ie the flex transverse to the mast is determined in this construction essentially by the clamp 4 and the clamping sleeve 2.

The clamping ramps 8 described above is with its end portions of corresponding receiving eyelets 96 (see FIG. 1 . 3 . 4 ) of the handle 94 and is then along a rope guide 98, 99 guided on both sides along the handle 94, wherein its U-shaped central portion of the free longitudinal edge of the sleeve head 30 to the hook 48 out overstretched. This Tampenverlauf is in the illustrations according to the FIGS. 1 and 2 shown with dash-dotted lines. Adjacent to the receiving eyelets 96 is according to Fig. 4 each a storage space 97 provided in the handle 94, in which the free rope end can be stowed respectively.

When rigging the mast is first inserted into the mast pocket of the sail and the luff easily enforced with the Luff fixed on the mast base. Subsequently, the boom is placed on the above-described boom head piece on the mast, including a corresponding, very narrow recess is provided in the sail, which is penetrated by the clamping sleeve 2.

To clamp the boom on the mast now the tensioning 8 must be threaded through this mast pocket recess into the hook 48. This requires a lot of skill in conventional solutions because this mast pocket recess is designed to maximize sail area and improve flow conditions as much as possible. It is very difficult from one side perform the clamps 8 and the hook, which is folded away from the collar head 30 in the open state to capture.

According to the invention this clamping process is thereby substantially facilitated, in accordance with FIG. 3 an extending beyond the joint, along the inner circumferential wall of the sleeve head 30 extending closing lever 98 is formed in sections in a correspondingly shaped recess 100 (see Figures 2 . 3 ) so that it is flush in the closed position with the inner peripheral wall of the sleeve head 30. With open clamping sleeve 2 and thus from the closed position thereof pivoted flap 34 and the closing lever 98 is pivoted away from the inner peripheral wall of the sleeve head 30. In the illustrated embodiment, the closing lever 98 as a rectangular (view FIG. 3 ) Cylinder surface segment executed.

When attaching to the mast (clamp 2 open) this swung out closing lever 98 runs on the outer circumference of the mast and is pivoted on further attachment in the sleeve head 30 and thus in the receptacle 100. By this pivoting movement, the flap 34 is also taken in the closing direction, so that it is easy for the surfer to put through the recess through the clamping lamps on the hook 48. Subsequently, the handle 94 is brought from the folded-out position into the abutment position on the clamp 4 and clamped according to the clamping lamps 8, so that a high clamping force acts on the clamping sleeve 2. The adjustment of the clamping sleeve 2 to the mast diameter is done in advance by length adjustment of the tensile force from the hook 48 on the clamping sleeve 30 transmitting clamping element 60. The above-described head piece 1 can thus be attached to a mast in a very simple manner, the flex variable to different conditions adaptable is.

In the above-described embodiment, the flex is set via the booster 18. In principle it is also possible to change the flex, ie the elasticity of the head piece upwards and downwards via rubber-elastic elements 102, which in FIG. 2 are indicated by a hatching. These rubber-elastic elements 102 are used on both sides in each case between the fastening tab pairs 22, 24 and the respective associated attachment portion 26 and 28 and arranged by means of a parallel to the mast longitudinal axis, not shown tensioning device. Depending on the bias of these rubber-elastic elements can then be adjusted according to the flex of the head piece 1 (similar to skateboard axis). In principle, the change of the flex can also be different by use Hard rubber elements or individual clamping devices can be changed up and down.

To improve the mounting of the clamping sleeve 2 on the mast can at the inner peripheral portion of the sleeve head 30 - as in FIG. 2 indicated - an anti-slip strip 104 are applied, which improves the friction between the sleeve head 30 and mast.

Based on FIGS. 8 to 11 a second embodiment of the boom head piece 1 is explained, which is optimized with respect to the aesthetic appearance and the function with respect to the embodiment described above. With regard to the components essential to the invention, there is largely agreement between the two exemplary embodiments, so that only the functional differences are discussed here.

FIG. 8 shows a view from the front, ie from the bow of the surfboard on the boom head piece 1. It can be seen the two connecting pieces 10 for the boom spars and the two connecting pieces 10 connecting clamp 4, which carries the clamping sleeve 2 with the booster 18. The closing of the clamping sleeve 2 is again effected by means of the clamping lever 6, which is mounted pivotably on the clamp 4.

In the illustrated embodiment, the clamping lever 6 is executed weight optimized, wherein in the in FIG. 8 to the viewer-facing area of the clamping lever 6, a large, approximately trapezoidal recess 106 is formed, which releases the view of the rear end face 108 of the clamp 4. On this end face 108 then, for example, the company logo of the applicant is applied.

The in FIG. 8 not shown U-shaped clamping ramps then passes through two lateral rope guides 110, 112 through to slip clamps 114, 116, in which the rope ends are occupied. The free end portions of the rope are then each in a storage space 97 (see the below explained in more detail FIG. 11 ). The function of the clamp eyes according to FIG. 8 corresponds to the eyelet 96 in the above-described embodiment.

At the in FIG. 8 illustrated variant, the two rope guides 110, 112 and the two slip clamps 114, 116 each in a recess 106 laterally bounding lever legs 118, 120 added.

FIG. 9 shows a plan view of the boom head piece 1 according to FIG. 8 , In this view, it can clearly be seen that the collar head 30 is fastened symmetrically to the boom longitudinal axis 122 on the clamp 4 - in the embodiment described above, the collar head 30 is asymmetrical, something for illustration according to FIG. 9 twisted attached to the clamp 4. The flex of the boom head piece or the clamping sleeve 2 is again set as in the embodiment described above via the booster 18, which abuts in mast longitudinal direction on the outer peripheral surface of the sleeve head 30. Similar to the embodiment described above, the flap 34 is hinged to the cuff head with the radially displaceably guided hook part 46, whose relative position is fixed on the previously described clamping element 60, which is also designed as a rope.

A special feature of the second embodiment is that on the clamping sleeve 2, an adapter 124 is attached, via which the clamping sleeve 2 can be used even with very thin masts. Such masts of small diameter d are used for example in waves. Usually, such an adapter 124 is placed on the mast, so that it can then be attached to conventional boom head pieces.

According to the invention, this conventional concept is overcome, which has proved unsuitable in practical application. In the second embodiment, this adapter 124 is releasably attached to the collet 2 or, more specifically, attached to the flap 34, so that the boom head piece 1 can be converted by attaching this adapter 124 very quickly for use on a thin mast.

FIG. 10 shows an oblique view of the head piece according to FIG. 9 , wherein the adapter 124 is shown in the disassembled state for clarity. From the illustration according to FIG. 10 one recognizes the automatic closing of the clamping sleeve 2 causing closing lever 98, which is designed in this embodiment in lightweight construction with a plurality of openings 126. In the illustrated embodiment, this closing lever 98 is formed integrally with the flap 34 and immersed in the closed state of the clamping sleeve 2 according to the embodiment described above into the recess 100 in the inner circumferential wall of the sleeve head 30 a.

The adapter 124 is designed as a comparatively elastic sleeve with a lateral insertion slot 128 through which the mast can be inserted into the adapter 124. The attachment of the adapter 124 to the flap 34 is based on FIG. 11 explained, which shows a rear view (seen in the direction of travel) on the boom head piece 1, wherein the clamping lever 6 is pulled out for clarity similar to the exploded view. In this illustration, one recognizes the fixed to the clamp 4 sleeve head 30 to which the flap 34 is articulated to the hook portion 46 and the hook 48.

The sleeve head has an opening 134 approximately in the center, through which a rotary knob 132 of the rotary closure 130 of the adapter 124 extends. The shape of the rotary knob 132 is adapted to that of the opening 134, so that upon insertion of the adapter 124 into the clamping sleeve 2 of the rotary knob 132 can be passed through the opening 134. This rotary knob is rotatably mounted on the adapter 124 via a pivot bearing 131. This pivot bearing 131 is shown in the illustration FIG. 10 stored in the relative position on the hook part 46. The locking is then done by turning the rotary knob 132 by 90 ° in the in FIG. 11 illustrated locking position in which the adapter 124 is reliably fixed to the inner peripheral wall of the flap 134. This construction thus makes it possible to insert or release the adapter 124 practically with a handle, so that the conversion can be extremely fast. To attach such a thin mast this is used with open clamping sleeve 2 through the slot 128 in the adapter 124 and then closed and braced the boom head piece 1 in the manner described above, again an automatic closing takes place by pressing the closing lever 98 to the mast.

In the illustration according to FIG. 11 are also clearly the storage spaces 97 to receive the end portions of the clamping tamp. These end portions can be accommodated in the respective associated storage space 97, so that they can not interfere with the function of the boom head piece 1 and also remain invisible from the outside.

In functional terms, the embodiment corresponds to the FIGS. 8 to 11 the above-described embodiments, so that further explanations are unnecessary.

The Applicant reserves the right to make an independent claim on the adapter 124 with the rotary closure 130 provided thereon.

Disclosed is a head piece in which the flex is variably adjustable depending on the conditions of use.

LIST OF REFERENCE NUMBERS

1

Boom head

2

clamping sleeve

4

clamp

6

clamping lever

8th

Klemmtampen

10

spigot

14

Boom spar

16

Boom spar

18

booster

20

Base

22

Fastening tab pair

24

Fastening tab pair

26

attachment section

28

attachment section

30

cuff head

32

insert

34

flap

36

joint projection

38

joint projection

40

Central joint part

42

pivot pin

44

pivot pin

46

hook part

48

hook

50

sliding tab

52

sliding tab

54

guide

56

guide

58

recess

60

clamping element

62

clamping ear

66

securing eye

68

securing eye

70

eyelet

74

base

76

support strut

78

support strut

80

plan edition

82

recess

84

recess

86

breakthrough

88

breakthrough

90

short thigh

91

short thigh

92

pivot

94

handle

96

mounting eye

98

closing lever

97

storage space

100

recess

102

rubber-elastic element

104

Anti-slip strips

106

recess

108

face

110

rope guide

112

rope guide

114

cleat

116

cleat

118

lever leg

120

lever leg

122

Boom longitudinal axis

124

adapter

126

breakthrough

128

insertion

130

screw cap

131

pivot bearing

132

rotary knob

134

breakthrough

Claims (13)

Fork head piece with a mast in sections encompassing clamping sleeve (2) which can be brought from an open position by means of a clamping lever (6) and a clamping means (8) in a closed position in which a portion of a mast is embraced, characterized by a Flexverstelleinrichtung (18, 102). A boom head piece according to claim 1 having a clamp (4) carrying the clamp collar (2) connectable to end portions of boom studs (14, 16). The boom head piece according to claim 1, wherein the flex adjustment device is a booster (18) of comparatively rigid material extending approximately in the longitudinal direction of the collar. A boom head piece according to claims 2 and 3, wherein the booster (18) is arranged between the clamping sleeve (2) and the clamp (4). The boom head piece of any one of claims 2 to 4, wherein the booster (18) has a plurality of apertures (86, 88) in the cuff longitudinal direction for insertion of a fastener for connection to the clamp collar (4). A boom head piece according to claim 5, wherein on both sides of a plane spanned by the boom arms (14, 16) plane in each case two in the sleeve longitudinal direction superimposed openings (86, 88) are provided. A boom head piece according to any one of claims 4 to 6, wherein the booster (18) has a connecting piece (10) of the clamp (4) partially encompassing base part (74) from which towards the clamping sleeve (2) support struts (76, 78) extend , which rest in sections on the outer circumference of the clamping sleeve (2). A boom head piece according to claim 7, wherein the base part (74) has a flat support (80) along which it rests against transverse to the clamping sleeve longitudinal axis arranged mounting portions (26, 28) of the clamping sleeve (2). A boom head piece according to claims 7 and 8, wherein the face support (80) is tangent to the circumference of the clamp collar. A boom head according to any one of claims 7 to 9, wherein the support struts (76, 78) are tapered towards their end portions. A boom head piece according to any one of the preceding claims, wherein the booster (18) is made by injection molding. A boom head piece according to any one of the preceding claims, wherein the flex adjustment means is a pretensionable rubber bearing (102) between the clamp collar (2) and the clamp (4). A boom with two boom arms (14, 16) connected by means of a boom end piece and a boom head piece (1) according to any one of the preceding claims.

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