EP0320950A1 - Mast wishbone joint for a sail board - Google Patents

Abstract

A mast-wishbone joint for a sail board, with an essentially annular wishbone support (11) which surrounds the mast (10) and can be brought into frictional connection with the latter by producing a circumferential tension. When the wishbone (31) is assembled, the arms of the wishbone (31) reach around the wishbone support (11), which is connected at its front side to the front wishbone joint fitting (29) preferably in a positive-locking manner. In the unstressed state, the wishbone support (11) has a predetermined inner circumference so that it can be pushed onto the mast (10) without particular application of force and can then be brought into frictional connection with the mast (10) by producing the circumferential tension. Provided between the mast (10) and the wishbone support (11) is a mast-diameter adaptor (12) which has at least two diameter-adaptation areas (13) effective between the mast (10) and the wishbone support (11). The one diameter-adaptation area, together with a mast or mast area of a first diameter, and the other diameter-adaptation area, together with a mast or mast area of a second diameter, have an outer circumference corresponding to the inner circumference of the wishbone support (11) in the unstressed state. <IMAGE>

Description

The invention relates to a mast-boom connection for standing sail boards with an encompassing the mast and with this by generating a circumferential tension in a non-positive connection, essentially ring-shaped boom support, which is mounted on both sides of the fork boom of the boom and is attached to it Front is preferably positively connected to the front fork connection fitting, the boom beam has a predetermined inner circumference in the untensioned state, such that it can be pushed onto the mast without any particular effort and can then be brought into the positive connection with the mast by generating the circumferential tension .

In order to functionally secure the boom at the desired height on the mast of a standing sail board, it was largely customary to attach a stop bar to the mast, in which the rope is looped around the mast and then attached to the front boom connection fitting. This type of attachment of the boom to the mast is very cumbersome.

In another way of attaching the boom to the mast by means of ropes, it is first attached to the front fork connection fitting, then looped several times around the mast and then goes back to the fork connection fitting, where it is fixed with a defined length that corresponds to the mast circumference. Then the rope is firmly stretched around the mast by folding the boom. It is now very cumbersome to adjust the defined length of the tamp looped around the mast so that the boom is held firmly on the mast and that the mast is not damaged by excessive tension of the tamp.

Such damage to the mast can lead to mast breaks during sailing, which can lead to life-threatening situations for the surfer, especially at sea or on large lakes.

From DE-PS 34 07 825 a mast sleeve with a T-shaped fastening part is already known, which is pushed onto the mast and is clamped at the desired location by means of a wedge body arranged between the mast and the mast sleeve. If the mast collar fixed to the desired location of the mast, the boom can with its front connecting fitting on _'plugged the T-shaped fastening part and are clamped by moving a lever with this.

Since different masts for standing sail boards now have different mast diameters, the mast diameters generally differing between 50 mm and 55 mm, and since one and the same mast also has different diameters due to its taper at different heights, with diameter differences of up to 2 or 3 mm can occur, the attachment of this known mast sleeve to the mast presents considerable difficulties.

In order to be able to hold the mast sleeve securely on the mast, it is necessary that the wedge body used has a relatively small wedge angle so as not to be released automatically by forces acting in the axial direction of the mast when sailing. On the other hand, this now has the consequence that it is difficult to loosen the known mast sleeve for adjusting the height of the boom, and it may even be necessary to use a tool. Another disadvantage is that the mast sleeve cannot be attached to the mast at any height, since the clamping effect of the wedge body is no longer sufficient to hold the mast sleeve securely if the mast diameter is too small. However, the mast collar may not even fit on other mast areas with a larger diameter.

This known mast sleeve can therefore only be used in conjunction with masts whose diameter is matched to the mast sleeve. If this mast is now conical, as is generally the case, the mast collar can only be fastened in a functional manner within a very small mast section. In addition to the cumbersome handling, this well-known mast sleeve also limits the attachment area for the boom to the mast.

From DE-OS 34 06 610 a device for attaching a boom to the mast of a standing sail board is also known, which has a rigid boom mast encompassing the mast, which can be non-positively attached to a mast by generating a peripheral tension. In this case, a fastening part is provided on the boom bracket that can be brought into positive engagement with a front fork connection fitting in order to hold the boom on the boom bracket.

To generate the circumferential tension, a wedge ring is provided which axially slides on an inner wedge surface with an outer wedge surface of the rigid boom bracket is slidably disposed. The axial displacement of the wedge ring relative to the boom bracket is carried out via a lever arrangement, so that the circumferential tension holding the boom bracket on the mast can be easily generated and eliminated.

In this known device the handling is thus improved, but this known device can also be attached only to masts or mast areas, on the diameter of which the boom bracket of the device is matched.

In contrast, the invention has for its object to provide a mast-boom connection of the type mentioned, which can be securely and easily attached to masts or mast areas with widely differing diameters.

This object is achieved in that a mast diameter adapter is provided between the mast and the boom bracket, which has at least two effective diameter adjustment areas between the mast and the boom bracket, one of which together with a mast or mast area of a first diameter and the other with a mast or mast area of a second diameter together has an outer circumference corresponding to the inner circumference of the boom bracket in the untensioned state.

By means of the mast diameter adapter provided according to the invention, the mast-boom connection can be fastened to masts or mast areas with essentially the same circumferential tension, so that the non-positive connection between the mast and the boom carrier is ensured in a defined manner. An essential aspect of the invention is that the mast diameter adapter must be used even with the largest mast diameter in order to generate the circumferential tension required for the frictional connection between the mast and the boom boom, and thus represents a mandatory accessory of the mast-boom boom connection according to the invention, without can never be driven. This prevents loss or misplacement of the mast diameter adapter.

In an advantageous development of the invention, it is seen that the mast diameter adapter has a large number of diameter adjustment areas, each of which is assigned to a mast or mast area with a specific diameter, the associated masts or mast areas having different diameters, the diameter adjustment areas of the mast diameter adapter being axially aligned following masts or mast areas with decreasing diameters are assigned.

The large number of diameter adjustment ranges means that the mast-boom connection according to the invention can be used on practically all masts, the diameter of which varies between a smallest and a largest diameter. The currently Masts used all have a diameter between 50 mm and 55 mm, so that the mast-boom connection can be used on all commercially available masts by a corresponding choice of the largest and the smallest diameter.

In addition, these measures allow the same mast-boom connection to be attached to the mast at different heights, depending on the needs of the respective user of the standing sail board, since the diameter differences in the area of attachment of the boom to the mast are approximately 2 mm to 3 mm.

In a preferred embodiment of the invention it is provided that the diameter adjustment areas of the mast diameter adapter with the mast diameter adapter arranged on the mast have increasing external circumferences from top to bottom, so that the boom boom automatically engages with the diameter adjustment area of the mast diameter adapter, which coincides with the diameter of the mast or mast area has an outer circumference corresponding to the inner circumference of the untensioned boom holder.

This ensures that the mast-boom connection according to the invention can be handled and attached to the mast in a particularly simple manner. To attach the boom to a desired mast area, only the mast-boom connection needs to be pushed open to the desired mast area. If it is arranged in the intended area, the boom boom, which is pulled down by its weight, automatically engages the diameter compensation area of the mast diameter adapter, which together with the mast diameter present at this point has the outer circumference matched to the inner circumference of the untensioned boom boom. A pre-clamping between the boom boom and the mast is achieved, which is sufficient to hold the mast-boom connection at the intended position of the mast. The mast-boom connection is now positioned on the mast. Then the circumferential tension is generated, which clamps the boom boom and thus the mast-boom connection firmly to the mast, so that it has the firm seat required for sailing to hold the boom.

In this way, a cumbersome alignment of boom boom and mast diameter adapter in the desired position is avoided.

In a further exemplary embodiment of the invention, it is provided that the mast diameter adapter has circumferentially extending grooves at least on its rear side, which form the diameter adjustment regions for a wire ring-shaped boom holder.

This makes it possible that a simple wire ring-shaped boom holder can be used, which is held securely in its axial position by the circumferential grooves, thereby preventing inadvertent loosening of the boom holder due to axial forces occurring during sailing.

In order to be able to arrange and fasten the mast-boom connection in the area of each diameter of a certain mast area, it is provided in a further exemplary embodiment of the invention that the diameter adjustment areas of the mast diameter adapter each have an outer circumference that continuously merges into the outer circumference of the adjacent diameter adjustment areas, so that any axial displacement of the boom bracket relative to the mast diameter adapter causes the boom bracket to abut another diameter adjustment area of the mast diameter adapter.

Through these measures, for a certain diameter range, e.g. For diameters between 50 mm and 55 mm, an infinite number of diameter adjustment areas are created, so that the circumferential tension required for secure attachment of the boom to the mast can always be generated on the boom carrier.

Another preferred embodiment of the invention is characterized in that the mast diameter adapter has an essentially smooth, conical outer surface in the axial direction.

As a result, the mast diameter adapter and thus the mast-boom connection can be established in a particularly simple and inexpensive manner.

Another preferred embodiment of the invention is characterized in that the mast diameter adapter is formed by a slit in the axial direction, flexible elastic conical sleeve.

The slit, flexible, conical sleeve used as a mast diameter adapter has the advantage that it clings tightly to the mast due to its bending elasticity and thereby achieves a pre-clamping that is sufficient to ensure the mast-boom connection during assembly on the mast to keep. In addition to the particularly simple manufacture, the slotted conical collar also further simplifies the handling of the mast-boom connection.

In order to be able to further improve the pressure transmission from the boom boom to the mast, another exemplary embodiment of the invention provides that the diameter adapter is formed by two conical sleeve shells which extend in the axial direction.

This makes it possible to use less elastic and therefore more pressure-resistant materials for the mast diameter adapter without. this affects the desired diameter adjustment.

Another embodiment of the invention is characterized in that the outer surface of the conical sleeve has at least on its front and / or rear side an axially extending area with a relatively large coefficient of friction, the outer surface of the sleeve being roughened in the areas with a relatively large coefficient of friction .

The roughened areas of the outer surface of the conical sleeve ensure that the non-positive connection between the boom bracket and the sleeve is more suitable for absorbing axial forces. This significantly increases the safety of the mast boom connection when sailing.

Another embodiment of the invention provides for improved absorption of axial forces acting between the boom support and the sleeve that the outer surface of the sleeve is coated in the areas with relatively large coefficients of friction with a larger coefficient of friction than the rest of the sleeve material.

In a further preferred embodiment of the invention it is provided that the cone angle of the mast diameter adapter is approximately 3 ° to 7 °, preferably 4 to 6 ', in particular 5 °. This special choice of the cone angle of the mast diameter adapter now ensures that the axial force generated by the circumferential tension between the boom bracket and the conical mast diameter adapter is kept small enough to prevent unintentional loosening of the mast boom connection. At the same time, however, self-locking is also avoided, so that loosening required for 'moving the boom on the mast is easily possible. This is possible in particular through the choice of the cone angle according to the invention without any tool and without using force, so that a very quick shifting of the mast boom connection is possible without effort.

In a further embodiment of the invention it is provided that between the mast diameter adapter and the boom bracket is arranged a guide sleeve encompassing the mast diameter adapter and the mast, on which the boom bracket is held axially and has a predetermined inner circumference, so that the boom bracket in the untensioned state together with the guide sleeve is displaceable relative to the mast diameter adapter, the inner surface of the guide sleeve being essentially designed as an inner cone, the cone angle of which is equal to the cone angle of the mast diameter adapter.

This ensures that the boom bracket always fits extremely precisely to the diameter adjustment range assigned to the corresponding mast diameter, whereby in addition to pre-clamping the mast diameter adapter on the mast, there is also a pre-clamping of the boom bracket together with the guide sleeve on the mast diameter adapter, which simultaneously pre-clamps between the mast diameter adapter and The mast is enlarged so that the position of the mast-boom connection on the mast that has been set remains exactly until the final clamping is achieved by the circumferential tension. The desired position of the mast boom connection can thus be set very precisely and sensitively.

In order to enable the guide sleeve to be pressed against the mast diameter adapter, in a further development of the invention it is provided that the guide sleeve has two sleeve shells diametrically opposite each other with respect to the mast diameter adapter, which are held by the boom holder in such a way that the boom holder in the untensioned state provides a firm hold maximum inner circumference of the guide sleeve is given.

This ensures that the guide sleeve, which has a fixed maximum inner diameter with which it rests against a corresponding diameter adjustment area, can easily accommodate a slight reduction in the inner circumference, so that it practically applies the contact pressure generated by the circumferential tension between the boom bracket and the mast diameter adapter or mast passes unabated to the mast diameter adapter.

In another embodiment of the invention it is provided that the guide sleeve has a resilient tongue on its front side, which is printed against the outer surface of the mast diameter adapter when the circumferential tension of the boom carrier is generated, the resilient tongue extending in the axial direction. As a result, the contact pressure generated by the circumferential tension can easily be transferred to the mast diameter adapter by a slight reduction in the inner circumference of the guide sleeve, it being advantageous to have a uniform guide sleeve which has a section with constant diameter. It is therefore not necessary to determine the maximum inner circumference of the guide sleeve by means of the boom holder, so that it can be designed as desired without regard to the inner sleeve according to the respective requirements.

In another embodiment of the invention it is provided that the guide sleeve has a window on its front through which the mast diameter adapter can be acted upon by a clamping element in order to generate the peripheral tension. Through the window provided according to the invention, the circumferential tension can be transferred directly to the mast diameter adapter by means of a corresponding clamping element.

Another advantageous embodiment of the invention is characterized in that the guide sleeve is made of flexible material, so that it can be radially compressed against the mast diameter adapter by the circumferential tension generated by the boom boom in order to effect the non-positive connection between the boom boom and the mast. As a result, a maneuvering collar that is particularly simple and inexpensive to manufacture is created.

In another preferred exemplary embodiment of the invention, it is provided that the diameter adjustment areas of the mast diameter adapter are circumferentially assigned successively to masts or mast areas with decreasing diameters, the mast diameter adapter being designed as a circumferential circumferential wedge which interacts with a corresponding circumferential ramp surface assigned to the boom boom.

Due to the circumferential successive arrangement of the diameter adjustment areas of the mast diameter adapter, it is achieved that the axial length of the mast-boom connection according to the invention can be freely selected independently of the number of diameter adjustment areas or of the maximum diameter difference to be bridged. It can be achieved due to the wedge-shaped design of the mast diameter adapter that for each mast diameter between a smallest and a largest diameter, a corresponding adjustment is available.

It is thus possible to create a particularly compact and easy-to-use mast boom connection.

In order to achieve the best possible and even jamming of the mast with the mast boom connection, it is provided in a further development of the invention that the mast diameter adapter is designed as a circumferential wedge collar with an axial slot, which has at least one wedge section, the circumferential length of the wedge section or sections being greater than half the circumferential length of the mast.

It is particularly advantageous here that at least two mutually opposite regions of the wedge section or sections are provided on the circumferential wedge collar according to the invention, so that the diameter compensation effects of these areas add up. This ensures that smaller wedge angles can be selected for effective diameter adjustment, which can improve the handling and function of the mast-boom connection according to the invention.

Another advantageous embodiment of the invention is described in claim 7.

In a particularly preferred embodiment of the invention, it is provided that the peripheral wedge collar has a plurality of mutually parallel, axial grooves, at least in the area of the wedge sections. The axially extending grooves provided according to the invention in the wedge sections of the circumferential wedge collar ensure that the circumferential wedge collar is sufficiently flexible along its entire circumference to fit exactly over the entire circumference to the ramp surfaces assigned to the boom holder. Furthermore, the grooves make it possible to use a relatively rigid, pressure-resistant material for the circumferential wedge collar without thereby impairing the required flexibility of the circumferential wedge collar.

In an advantageous development of the invention, it is provided that the wedge angle y of the circumferential wedge collar, that is the angle between the tangents to the inner or outer circumference of the circumferential wedge collar in the corresponding intersection points of a radius line, is between 4 'and 10 °, preferably between 5 and 8 °, in particular about 6.

In order to be able to use a mast-boom connection according to the invention again and again with the same mast or with masts of the same diameter without carrying out a diameter adjustment again, in another development of the invention it is provided that the mast diameter adapter in each set position against twisting can be ensured.

In order to be able to move the mast-boom connection according to the invention in a simple manner on the mast without it being necessary to hold the individual parts together, in another embodiment of the invention it is provided that the mast diameter adapter is secured against axial displacement relative to the boom carrier .

A particularly advantageous development of the invention is characterized in that the circumferential wedge collar serving as a mast diameter adapter has knobs protruding radially outward at its axial ends, with at least the knobs on one of the two axial ends projecting so far beyond the outer circumference of the guide collar serving as boom boom, that they act as actuating knobs.

In this surprisingly simple way it can be achieved that the knobs provided for axial securing can be used simultaneously to actuate the peripheral wedge collar, and thus to adjust the mast-boom connection. As a result, the structure of the mast-boom connection according to the invention is further simplified and improved.

• Fig. 1 eine schematische Seitenansicht einer Mastgabelbaumverbindung, die auf einem Mast angeordnet ist,
• Fig. 2 einen Schnitt im wesentlichen nach Linie 11-11 in Fig. 1,
• Fig. 3 eine schematische Seitenansicht einer anderen Mastgabelbaumverbindung entsprechend Fig. 1,
• Fig. 4 eine weitere Mastgabelbaumverbindung entsprechend Fig. 1,
• Fig. 5 einen Schnitt im wesentlichen nach Linie V-V in Fig. 4,
• Fig. 6 eine schematische teilweise geschnittene Mastgabelbaumverbindung mit Führungsmanschette,
• Fig. 7 eine Vorderansicht einer anderen Führungsmanschette für die Mastgabelbaumverbindung nach Fig. 6,
• Fig. 8 eine Vorderansicht einer weiteren Führungsmanschette für die Mastgabelbaumverbindung nach Fig. 6,
• Fig. 9 einen Schnitt durch eine bevorzugte Ausführung einer Mastgabelbaumverbindung mit daran angeordnetem Gabelbaum
• Fig 10 eine Draufsicht auf die Mastgabelbaumverbindung nach Fig. 9,
• Fig 11 eine teilweise geschnittene Draufsicht auf eine Mastgabelbaumverbindung mit Umfangskeilmanschette,
• Fig 12 eine teilweise geschnittene Draufsicht auf die Mastgabelbaumverbindung nach Fig. 11, wobei die Umfangskeilmanschette verdreht ist,
• Fig 13 eine teilweise geschnittene Seitenansicht einer Mastgabelbaumverbindung nach Fig. 11 und
• Fig 14 eine teilweise geschnittene Draufsicht auf eine andere Mastgabelbaumverbindung mit Umfangskeilmanschette.

The invention is described in more detail below, for example with reference to the drawing. The drawing shows:

• 1 is a schematic side view of a mast boom connection, which is arranged on a mast,
• 2 shows a section substantially along line 11-11 in Fig. 1,
• 3 is a schematic side view of another mast boom connection corresponding to FIG. 1,
• 4 shows another mast boom connection according to FIG. 1,
• 5 shows a section essentially along line VV in Fig. 4,
• 6 is a schematic partially sectioned mast boom connection with guide sleeve,
• 7 is a front view of another guide sleeve for the mast boom connection according to FIG. 6,
• 8 is a front view of a further guide sleeve for the mast boom connection according to FIG. 6,
• 9 shows a section through a preferred embodiment of a mast boom connection with a boom arranged thereon
• 10 is a plan view of the mast boom connection according to FIG. 9,
• 11 is a partially sectioned plan view of a mast boom connection with peripheral wedge collar,
• 12 is a partially sectioned top view of the mast boom connection according to FIG. 11, the peripheral wedge collar being twisted,
• 13 is a partially sectioned side view of a mast boom connection according to FIGS. 11 and
• Fig. 14 is a partially sectioned plan view of another mast boom connection with circumferential wedge collar.

Corresponding components in the various figures of the drawing are identified by the same reference numerals.

1 and 2, a mast boom connection with a mast diameter adapter 12 is shown, which is arranged on a mast 10. The mast diameter adapter is designed as a conical sleeve 12 which has an axially extending slot 22. Around the conical sleeve is a wire boom 11, which has an offset 23 on its front side, into which a hook 24, which is designed as a curved wedge, engages, which on a front fork connection fitting, not shown, of a fork tree, also not shown in FIG is appropriately attached.

At its upper edge, the conical sleeve 12 has an annular bead 25 in order to prevent the non-tensioned boom holder 11 from accidentally slipping off the conical sleeve 12.

In order to attach a boom to a mast 10 with the mast boom connection described, the conical collar 12 is first pushed onto the mast together with the boom carrier 11. The boom bracket 11 is held in contact with the annular bead 25, which is adjoined at the bottom by a first diameter adjustment region 13, which is provided for a largest mast diameter. After the mast boom connection at the desired area of the mast 10, which in the example shown in FIGS. 1 and 2 has an average diameter, is arranged, the released boom boom 11 slides down on the con cuff 12 until it comes with a another diameter adjustment area 13 engages, the outer circumference of which corresponds to the substantially fixed inner circumference of the boom bracket 11. In this way, a pre-clamping of the mast boom connection on the mast 10 is achieved, so that the hook 24 of the front boom connection fitting can be inserted into the offset 23 of the boom carrier 11. Finally, the boom is pivoted into its sailing position, whereby the hook 24, which is designed as a curved wedge, is pushed with its thicker clamping region into the offset 23, so that it supports the boom carrier 11 with the conical collar 12 and thus with the mast 10 by the circumferential tension thus generated jammed securely. This results in a secure, immovably firm fit of the mast boom connection on the mast 10.

In its front area, which is associated with the opening of the boom boom 11 and the diametrically opposite rear area, the conical sleeve 12 can have an increased coefficient of friction, which can be achieved by roughening or a corresponding coating. As a result, an improved axial fit of the boom holder 11 on the conical sleeve 12 is achieved.

To arrange the mast boom connection at a different height on the mast 10, where the mast 10 has a different diameter due to its taper, the course of which need not be uniform, the boom only needs to be pivoted out of its sailing position, so that the wedge-shaped The hook 24 is moved out of its clamped position and the circumferential tension of the boom holder 11 generated by it is eliminated. Now the mast boom connection can be easily moved on the mast 10 so that it can easily be arranged in another desired mast area. If this mast area has a different diameter than the previous one, the boom support 11 bears against another diameter adjustment area 13 of the conical collar 12, the outer circumference of which now corresponds to the inner circumference of the boom support 11 due to the changed diameter of the mast area. Subsequently, the circumferential tension holding the mast boom connection firmly on the mast is generated by means of the hook 24 as described above.

3 shows another mast boom connection arranged on a mast 10 with a sleeve 12 which serves as a mast diameter adapter and has a slot 22 in order to be able to fit tightly against the mast 10 due to its bending elasticity. On its front side, which is associated with the front boom connection fitting, the collar 12 has a circumferential region with a constant thickness, while on the rear side of the collar 12 there is a circumferential region with increasing thickness from top to bottom, which forms a circumferential section of a cone. In this rear circumferential area of the sleeve 12, circumferentially extending grooves 14 are provided which form the diameter adjustment areas 13 of the sleeve. Around the cuff 12 is placed a boom carrier 11, which in turn has an offset 23 in its front area, into which a front Ga can be engaged wedge-shaped hook 24 arranged to generate the circumferential tension.

This mast boom connection is installed in the same way as described above.

4 and 5 show another mast boom connection with a mast diameter adapter 12 designed as a conical sleeve, which is arranged on a mast 10. The cuff 12 in turn has an axially extending slot 22 and at its upper end an annular bead 25, which prevents unintentional sliding of the boom bracket 11. The boom bracket 11 is designed as a clamp 11, which has in its peripheral region with which it rests on the conical sleeve 12, an inner surface which has the shape of an inner cone. On its front side, the clamp 11 has two tabs 26 which extend forward and between which a retaining bolt 27 extends. On the outside of the tensioning clamp 11, parallel, planar support regions 28 are provided in their side areas, which extend over the entire axial length of the tensioning clamp 11.

The retaining bolt 27 is arranged at a distance from the conical sleeve 12, so that an intermediate space is formed, into which a hook 24 arranged on a front Gabei connecting fitting 29 can be inserted, which in turn has the shape of a curved wedge. Furthermore, cheeks 30 are provided on the front fork connection fitting 29, which bear laterally against the support regions 28 when the fork tree 31 carried by the boom connection fitting 29 is pivoted into its sailing position.

Instead of the retaining bolt 27, an eccentrically mounted rotatable roller can also be provided between the tabs 26, which can be rotated by means of the hook provided on the fork connection fitting 29 such that it does not produce any circumferential tension of the clamp 11 when the boom 31 is parallel to the mast 10 when the boom 31 is in the sailing position, rotated 90 'with its circumferential region having a greater distance from its axis of rotation, it presses against the surface 15 of the conical collar 12 in order to bring about the circumferential tension.

The conical sleeve serving as a mast diameter adapter in turn has on its outer surface 15 a large number of diameter adjustment areas 13, the axial length of which corresponds in each case to the axial length of the holding clamp 11. The individual diameter adjustment areas 13 overlap for different mast diameters. as shown for example for two diameter adjustment areas 13 in FIG. 4. Thereby, the diameter adjustment regions 13 merge continuously into one another, so that between an diameter adjustment region 13 for a smallest mast diameter and a diameter adjustment region 13 for a largest mast diameter, practically an infinite number of diameter adaptation regions 13 are provided for each mast diameter of this diameter range.

In order to attach a boom 31 with this mast boom connection to the mast 10, as described above, the mast boom connection is first pushed onto the mast, the tensioning clamp 11 coming into engagement with the diameter adjustment area 13 assigned to the present mast diameter and thus a pre-fixed fit of the mast boom connection on Mast 10 causes. Subsequently, the boom 31 arranged essentially parallel to the mast 10 is inserted with the hook 24 provided on the fork connection fitting 29 into the space between the retaining bolt 27 and the conical collar 12. Then the boom 31 is pivoted counterclockwise into its sailing position, the thickened part of the hook 24 is pushed between the retaining bolt 27 and the conical sleeve 12 to the peripheral tension of the clamp 11 and thus the positive connection between it and the conical sleeve 12 or to effect the mast 10. The cheeks 30 lie against the support areas 28 of the clamp 11 in order to provide additional support for the boom against pivoting movements about the mast axis.

This mast boom connection is moved after releasing the circumferential tension by pivoting the boom 31 in the same way as described above.

6 also has a conical sleeve 12 with an axial slot 22, which is attached to a mast 10, as the mast diameter adapter. A tensioning strap 11 is provided as a boom holder, the front ends of which are connected by means of a retaining bolt 27. The tensioning band 11 is arranged on a guide collar 16 formed from two collar shells 18, 18 'between two circumferentially extending retaining webs 32.

The inner surface 17 of the guide sleeve 16 is designed as an inner cone, the cone angle of which is equal to that of the conical sleeve 12. The size of the cone angle is chosen so that when the guide collar 16 rests in the corresponding diameter adjustment area 13 when the mast boom connection is arranged on a mast 10, one Pre-clamping of the mast fork tree connection on the mast 10 is achieved, but on the other hand there is no self-locking of the two conical surfaces of the sleeve 12 and the guide sleeve 16 on one another, so that the pre-clamping can be easily loosened without the aid of tools. The cone angle is therefore preferably in an angular range of 3 ° to 7 ° and is in particular 5`.

On the front of the guide sleeve 16, a pressure plate 33 opposite the retaining bolt 27 of the boom bracket 11 is fastened, onto which a clamping element, not shown in FIG. 6, to be arranged between the retaining bolt 27 and the pressure plate 33, e.g. a curved wedge that acts.

Instead of the guide sleeve 16 constructed from two sleeve shells 18, 18, a guide sleeve 16 as shown in FIG. 7 can also be used in the mast boom connection according to FIG. 6. In its front area, this guide sleeve has a resilient tongue 19, on which the pressure plate 33 is fastened. The resilient tongue 19 is simply formed by slots 34 in the guide sleeve 16. Due to the resilient tongue 19, a slight reduction in the inner circumference of the guide sleeve 16 can be achieved, which is brought about by the clamping part to be arranged between the retaining bolt 27 of the boom bracket 11 and the pressure plate 33 when the circumferential tension is generated.

Instead of the resilient tongue 19, a window 20 can also be provided, as shown in FIG. 8, through which a clamping part, which is supported on the retaining bolt 27, acts directly on the conical sleeve 12 serving as a mast diameter adapter.

This mast boom connection is handled in the same way as described above.

9 and 10 show a further mast boom connection with a conical sleeve 12 serving as a mast diameter adapter and having an axial slot 22. A guide collar 16 is placed on the conical collar 12, on which a wire ring-shaped boom bracket 11 is held in a retaining groove 34 at least on the rear side of the guide collar. On the front of the guide sleeve 16, a forwardly extending stop flange 34 is provided on its upper edge. In addition, the guide sleeve 16 has flat and parallel support regions 28 on its sides.

The boom bracket 11 extends at a relatively large distance in an arc around the front of the guide sleeve 16 so as to form a receiving area 23 for a clamping element 21 provided on the front fork connection fitting 29.

The fork-joint fitting 29, the boom 31 arcuately extends from the from _'around the mast backwards, carrying on its upper side a ridge 35 having a forward nose 36 and a rounded back support pad 37th In addition, cheeks 30 are provided on the fork connection fitting 29, which abut the support regions 28 of the guide sleeve 16 when the boom 31 is in its sailing position.

The arrangement of this mast boom connection on the mast and the generation of the pre-clamping with which the mast boom connection is slidably held on the mast is carried out in the same way as in the other described mast boom connections.

After the mast boom connection is arranged on the intended mast area, the nose 36 of the web 35 is hooked into the front arcuate area of the boom carrier 11, the boom 31 lying essentially parallel to the mast 10. Then the boom 31 is again pivoted counterclockwise to its sailing position. The support bead 37 comes into engagement with the outer surface of the guide sleeve 16 and begins to cause the circumferential tension of the boom holder 11. With the further swiveling of the boom 31, the web 35 forming the clamping element 21 moves ever further into the receiving area 23 of the boom carrier 11, the support bead 37 sliding along the guide sleeve 16. Shortly before the boom '31 assumes its sailing position, the support bead 37 passes through the plane formed by the boom carrier 11 and then lies against the stop flange 34 on the guide collar 16, the peripheral tension of the boom carrier 11 decreasing slightly. The boom has now reached its sailing position.

During this pivoting in of the clamping element 21, the circumferential tension generated by it on the boom support 11 is greatest when the support bead 37 is in the plane of the boom support 11. Thus, the clamping element 21 assumes an over-dead center position when the boom 31 is in its sailing position, from which it cannot release itself.

The transmission of the circumferential tension generated by the clamping element 21 of the boom holder 11 to the conical sleeve 12 takes place via the guide sleeve 16, which deforms elastically in its upper edge region in which the boom holder 11 is arranged, so that no special slots or the like. vorese must be hen.

Otherwise, this mast boom connection is handled as with the others. described mast guest tree connections.

Fig. 11 shows a mast boom connection with a boom bracket, which is designed as a guide sleeve 11 '. The guide sleeve 11 'is provided on its front side with an axle bearing 29' for a boom 31 or for a boom head piece. In the area of the axle bearing 29, the guide sleeve 11 has an axial slot 54 which extends over the entire axial length of the guide sleeve 11 'and which at the same time divides the axle bearing 29 into two bearing halves 29 transversely to the longitudinal axis of the bearing, which with respect to the one shown in FIG. 11 mast, not shown, can be shifted circumferentially against one another in order to firmly clamp the mast 10 to the mast boom connection.

Provided in the guide collar 11 'is a circumferential circumferential recess 55, the circumferential surface of which forms a ramp surface 51 which interacts with a circumferential wedge collar 12' arranged essentially in the recess 55. The recess 55 is delimited in the circumferential direction by two stop shoulders 56, 57 which form end positions for the circumferential wedge collar 12.

In Fig. 11, the peripheral wedge collar 12 'is shown in its first end position, in which it rests on the mounting shoulder 56 and occupies the largest open position.

In this largest open position, the free diameter of the mast boom connection is, for example, 58 mm, while the mast diameters vary only between 50 and 55 mm.

At its axial ends, the circumferential wedge collar 12 has knobs 53 which protrude radially outward beyond the guide collar 11 'and thus simultaneously hold the circumferential wedge collar 12 axially in the guide collar 11 and a rotation of the circumferential wedge collar 12 relative to the guide wedge collar 11' by a user enable.

. In a particularly advantageous embodiment of the mast boom connection according to FIG. 11, it is provided that the wedge angle y, which is defined by the tangents T1 and T2, is approximately 6 °. The tangents T1 and T2 are placed at the intersections of a radius line R with the inner circumferential surface and the outer circumferential surface of the circumferential wedge collar 12 on the corresponding circumferential surfaces.

The choice of this special wedge angle y has the effect that a circumferential displacement of the circumferential wedge collar 12 'relative to the guide collar 11' causes a reduction in the free diameter of the collar by one millimeter. If, as shown in FIG. 11, a circumferential wedge collar 12 is used, the circumferential extent of which extends over more than 180 °, a rotation of the circumferential wedge collar 12 by 4 cm results in a diameter change of 8 mm, since the free radius of the collar is at least in two diametrically opposite areas was reduced by 4 mm.

The mast boom connection described with reference to FIGS. 11 to 13 is used as follows.

First, the peripheral wedge collar 12 'is brought into its open position (FIG. 11), in which it lies against the stop shoulder 56. The free diameter of the mast receiving area of the mast boom connection is then e.g. 58 mm. As a result, a mast with a large diameter (currently the maximum mast diameter is 55 mm) can be easily inserted into the mast boom connection.

As soon as the mast and mast boom connection are arranged in the correct position relative to one another, the peripheral wedge collar 12 is rotated by means of the knobs 53 until the free diameter of the mast boom connection is adapted to the given mast diameter. Now the bearing halves 29 ″ of the axle bearing 29 are moved towards one another by means of a tensioning device, not shown, whereby the guide sleeve 11 ′ is clamped together in the region of the slot 54 and thus brings about the clamping action required for a secure connection of the boom and mast.

11 to 13, like in FIG. 14, a representation of a special clamping device for the mast boom connection has been dispensed with, since the exemplary embodiment shown can be used with any known clamping device.

The mast boom connection shown in FIG. 14 with the circumferential wedge collar 12 'differs from the mast boom connection described with reference to FIGS. 11 to 13 essentially only in the configuration of the circumferential wedge collar 12'. The circumferential wedge collar 12 'shown in FIG. 14 has two wedge sections 50 which are diametrically opposite one another. Each of these two wedge sections 50 is assigned its own ramp surface 51, which is formed by the peripheral surfaces of recesses 55 'in the guide sleeve 11'.

Around the peripheral wedge collar 12 made of a relatively strong material e.g. To be able to form a solid plastic material that is capable of absorbing high pressures, a plurality of mutually parallel axial grooves 52 are provided in the wedge sections 50 of the peripheral wedge collar 12.

The webs formed between the grooves 52 form with their outer surfaces the wedge surfaces which cooperate with the ramp surfaces 51 of the guide sleeve 11.

In addition to ensuring the flexibility of the circumferential wedge collar 12 ', the grooves 52 have the advantage that the abutting surfaces between the circumferential wedge collar 12 and the guide collar 11' are reduced so that sand grains or other contaminants penetrating between them can be removed relatively easily, so that a jamming of the two. Parts against each other is prevented.

Instead of the knobs 53 for actuating the circumferential wedge collar 12 or in addition to them, a radially extending screw bolt 58 can be provided, which is connected to the circumferential wedge collar 12 in a suitable manner, not shown, and which extends through a circumferentially extending slot 59 in the guide collar 11 'stretched through.

For example, a knurled nut 60 can be screwed onto the screw bolt 58.

In this way, which is only shown by way of example, an axial securing of the circumferential wedge collar 12 ′ in the guide collar 11 can also be ensured at the same time and the actuation of the circumferential wedge collar 12 possible. Another advantage of the bolt 58 with the associated knurled screw 60 is that a certain, set position of the peripheral wedge collar 12 'can be held by tightening the knurled screw 60. The peripheral wedge collar 12 'serving as a mast diameter adapter is thus secured against twisting.

The handling of the mast boom connection shown in FIG. 14 is carried out in the same manner as that of the mast boom connection shown in FIGS. 11 to 13.

Claims (10)

1. mast-boom connection for standing sail boards with an encompassing the mast and with this by generating a circumferential tension in a non-positive connection, essentially ring-shaped boom holder, which is encompassed on both sides by the forks of the boom when the boom is mounted and on the front with the Front fork connection fitting is preferably positively connected, wherein the boom bracket has a predetermined inner circumference in the untensioned state, such that it can be pushed onto the mast without any particular effort and can then be brought into positive connection with the mast by generating the circumferential tension that between the mast (10) and the boom bracket (11) a mast diameter adapter (12) is provided, which has at least two effective between the mast (10) and the boom bracket (11) diameter adjustment areas (13), one of which with a mast or mast area of a first diameter, together and the other with a mast or mast area of a second diameter together has an outer circumference corresponding to the inner circumference of the boom bracket (11) in the untensioned state, in particular the mast diameter adapter (12) having a large number of diameter adjustment areas (13), of each of which is assigned to a mast or mast area with a specific diameter, the associated masts or mast areas having different diameters. 2. mast-boom connection according to claim 1,
characterized,
that the diameter adjustment areas (13) of the mast diameter adapter (12) are assigned axially successively to masts or mast areas with decreasing diameters and / or that the diameter adjustment areas (13) of the mast diameter adapter (12) with the mast diameter adapter (12) arranged on the mast (10) from top to top have increasing outer circumferences below, so that the boom support (11) automatically engages with the diameter adjustment area (13) of the mast diameter adapter (12), which together with the diameter of the mast or mast area has an outer circumference corresponding to the inner circumference of the untensioned boom support (11), and / or that the mast diameter adapter (12) has circumferential grooves (14), at least on its rear side, which form the diameter adjustment areas for a wire ring-shaped boom holder (11). 3. mast-boom connection according to claim 1 or 2,
characterized,
that the diameter adjustment areas (13) of the mast diameter adapter (12) each have an outer circumference that merges continuously into the outer circumference of the adjacent diameter adjustment areas (13), so that any axial displacement of the boom support (11) relative to the mast diameter adapter (12) leads to the fact that the The boom bracket (11) bears against another diameter adjustment area (13) of the mast diameter adapter (12), with the mast diameter adapter (12) has an essentially smooth, conical outer surface (15) in the axial direction. 4. mast-boom connection according to one of the preceding claims,
characterized,
that the mast diameter adapter is formed by an axially slit, flexible, conical sleeve (12) or the diameter adapter (12) is formed by two axially extending, conical sleeve shells and / or the outer surface (15) of the conical sleeve (12) at least has an axially extending area with a relatively large coefficient of friction on its front and / or rear side, the outer surface (15) of the sleeve (12) expediently being roughened in the areas with a relatively large coefficient of friction or the outer surface (15) of the sleeve (12 ) is coated in the areas with relatively large coefficients of friction with a larger coefficient of friction than the rest of the sleeve material. 5. Mast-boom connection. according to one of claims 1-4,
characterized,
that the cone angle of the mast diameter adapter (12) is approximately 3 ° to 7 °, preferably 4 ° to 6 °, in particular 5 °, and / or that between the mast diameter adapter (12) and the boom bracket (11) is a mast diameter adapter (12) and the mast (10) encompassing guide sleeve (16) is arranged, on which the boom bracket (11) is held axially and which has a predetermined inner circumference, so that the boom bracket (11) together with the guide sleeve (16) relative to the mast diameter adapter in the untensioned state (12) is displaceable, the inner surface (17) of the guide sleeve (16) preferably being essentially designed as an inner cone, the cone angle of which is equal to the cone angle of the mast diameter adapter (12), and in particular the guide sleeve (16) is two in relation to one another the mast diameter adapter (12) has diametrically opposed sleeve shells (18, 18 ') which are held by the boom bracket (11) so that the Ga Belbaumträger (11) in the untensioned state, a fixed maximum inner circumference of the guide sleeve (16) is given, or the guide sleeve (16) has a resilient tongue (19) on its front, which creates the circumferential tension of the boom holder (12) against the outer surface ( 15) of the mast diameter adapter (12) is pressed, in particular the resilient tongue (19) extending in the axial direction, or the guide sleeve (16) has on its front a window (20) through which the mast diameter adapter (12) for generating the The circumferential tension can be acted upon by a clamping element (21) or the guide sleeve (16) is made of flexible material, so that it can be radially compressed against the mast diameter adapter (12) by the circumferential tension generated by the boom bracket (11) in order to ensure the positive connection between the boom bracket ( 11) and the mast (10). 6. mast-boom connection according to claim 1,
characterized,
that the diameter adjustment areas of the mast diameter adapter (12 ') are assigned circumferentially successively to masts (10) or mast areas with decreasing diameters, the mast diameter adapter (12') preferably being designed as a circumferential circumferential wedge which is provided with a corresponding circumferentially circumferential wedge support (11 ) associated ramp surface (51) cooperates and that preferably also the mast diameter adapter is designed as a circumferential wedge collar (12 ') with an axial slot (22) which has at least one wedge section (50), in particular the circumferential length of the wedge section (s) (50 ) is greater than half the circumferential length of the mast (10). - 7. mast-boom connection according to claim 6,
characterized,
that the circumferential wedge collar (12 ') has a plurality of wedge sections (50) distributed uniformly over the circumference, each wedge section (50) being assigned its own ramp surface (51), the circumferential wedge collar (12') expediently having two diametrically opposed wedge sections (50) having. 8. mast-boom connection according to claim 6 or 7,
characterized,
that the circumferential wedge collar (12 ') has at least in the region of the wedge sections (50) a plurality of mutually parallel, axial grooves (52) and / or that the wedge angle (y) of the circumferential wedge collar (12'), i.e. the angle between the tangents to the Inside or. on the outer circumference of the circumferential wedge collar (12 ') in the corresponding intersection points of a radius line, between 4 ° and 10 °, preferably between 5 ° and 8 °, in particular approximately 6. 9. mast-boom connection according to one of claims 6 to 8,
characterized,
that the mast diameter adapter (12 ') can be secured against twisting in any set position. 10. mast-boom connection according to one of claims 6 to 9,
characterized,
that the mast diameter adapter (12 ') is secured against axial displacement relative to the boom support (11'), the peripheral wedge collar (12 ') serving as the mast diameter adapter in particular having radially outwardly protruding knobs (53) at its axial ends, and preferably also at least the Knobs (53) protrude on one of the two axial ends so far beyond the outer circumference of the guide sleeve (11 ') serving as a boom holder that they act as actuating knobs.

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