EP0101040A2 - Mast foot securing system for a wind-surf board - Google Patents

Abstract

The mast foot mounting system for a sailboard in accordance with the invention comprises a slide track and a sliding shoe supported for displacement in the slide track and carrying the mast foot and adapted to be locked firmly in a plurality of positions along the slide track. An actuator always remaining in a fixed position is disposed at the sternward end of the slide track for release of the lock. The narrow sliding shoe is provided in front of the mast foot pin with a safety fastener which permits adjustment of the overload at which the mast foot pin is set free by the safety fastener.

Description

The invention relates to a mast foot bracket for a sailing surfer.

For sail surfers, it is often advisable to shift the point on the surfboard at which the driving force of the sail acts, forwards or backwards, depending on the respective driving conditions. For this purpose, a slide rail is embedded in the deck of the surfboard, which runs in the longitudinal axis of the surfboard. A slide block is slidably guided in this slide rail, in which the mast base is held.

On space sheet courses, the mast is now moved backwards with the gliding block, since the windsurfer travels on a less gliding surface on this course and is much easier to control by shifting the pressure point to the center of the board; in In this case, the maneuverability of the surfboard improves because the effect is achieved as if you were riding a shorter board. The sword is fully folded in here.

On half wind and cross course the mast is brought into the front position, since the surfboard is then easier to drive and a much better wind speed can be achieved. It is also possible, by adjusting the mast accordingly, to use sails with a lower cut leech, which then do not drag in the water, but with which, as a rule, a higher speed can be achieved than with a sail with a higher cut leech.

Intermediate adjustment positions enable fine adjustment to the prevailing wind and course conditions.

In known constructions, a locking device is attached to the slide block, which has a trigger button that can be actuated by the foot. If the surfer wants to change the mast position while driving, he must press the release button near the mast foot with his foot and then use the boom to move the mast bow or stern. It should be noted here, however, that the foot is removed from the release button, otherwise it moves along with the movement, which endangers the balance of the surfer.

Especially when you provide a long slide rail to enable the surfboard to be adjusted to extreme driving conditions by means of a correspondingly large adjustability, this known device is uncomfortable and possibly even dangerous since it forces the surfer to do his normal Leave the standing position with one foot to actuate the release button. At this point in time, however, a particularly secure stand is required, since the wind pressure influences the displacement of the mast and therefore careful control of the mast via the boom is required.

It is therefore an object of the invention to further develop the known mast foot bracket in such a way that it allows the mast to be adjusted effortlessly and safely with a simple construction.

A second problem arises in connection with the mast foot bracket: If the mast falls, the surfer can get caught with a body part between the surfboard and mast. It is therefore desirable that the mast with its mast foot is released as easily as possible from the mast foot holder in order to avoid injuries. On the other hand, however, the mast foot bracket must ensure that the mast does not come loose from the bracket during normal travel due to the wind pressure.

It is usually known before the start of the journey which maximum wind pressure is to be expected. For this reason, it is provided in DE-AS 27 47 057 that with a mast foot bracket the spring element ensuring the seat of the mast base is interchangeable with a stronger or weaker one, so that the load can be selected individually to separate the connection between mast and surfboard body is required.

The exchange of different springs is, however, very difficult to accomplish. In addition, the known mast foot bracket is relatively bulky, so that it is not possible to adjust it on the sliding block of the above attachable mast foot bracket. Instead, it is proposed in the publication that two consecutive, separate receptacles should be provided so that a suitable mast position can be selected in each case according to the intended course before starting the journey. Of course, changing this position is not possible with the known surfboard while driving.

Proceeding from this prior art, the invention is further based on the object of finding a mast foot mount in which the force required to separate the mast and surfboard body can be individually adjusted with simple means, the mast foot being attached to a sliding block which is in a Slide rail runs, which is embedded in the deck of the surfboard.

Furthermore, a device is to be provided which enables the set separating force to be read effortlessly.

The solution of the above-mentioned first object is achieved by the features of claim 1. Preferably, a movable latching element is arranged inside and parallel to the slide rail, which can engage at different positions with a corresponding counter-formation, which is attached to the slide block, in such a way that it is held stationary. The engagement can be released by moving this latching element. To move this locking element, a control device is arranged at the rear end of the slide rail, which comprises the foot-actuated release button and a coupling, by means of which this release button is connected to the locking element for moving it.

The release button is thus just before the Sword box of the surfboard, and that near the place where the surfer usually uses his foot. With a simple toe press, the surfer can unlock the sliding block and then use the boom to move the mast in the desired direction. As long as the pressure on the release button is maintained, the mast can be moved past locking positions without it engaging. If the release button is not pressed, the mast moves to the next stop position and then snaps into place.

The latching element can in turn have movable pawls which are pulled out of engagement with a rigid counter-formation in the sliding block by longitudinal movement. According to an embodiment of the invention, however, it is particularly advantageous that the latching element is designed as a rod which has notches made on one side at the latching positions. It is now possible to form a rigid nose on the sliding block, which can be brought into engagement with the notches, and to laterally deflect the rod to release the engagement. Preferably, however, a pivotally mounted pawl is arranged on the sliding block, which is set up for locking engagement in any latching configuration. At the same time, the coupling is designed as a rotary drive for the latching rod by such an angle of rotation that the latching designs are rotated out of the engagement area of the pawl or a design on the latching bar presses the pawl out of engagement.

The rotatable mounting of the locking rod is easy to carry out, and the rotary drive of the locking rod can be brought about in a simple manner by actuating the release button.

According to one embodiment of the invention, the latching rod is arranged next to an inner wall of the slide rail, the latching formations facing away from this inner wall. The locking rod can thus be made relatively thin. A deflection of the locking rod to such an extent that the locking is released automatically is not possible because the locking rod is previously supported against the inner wall of the slide rail.

The side surface of the sliding block facing the inner wall is preferably formed with a longitudinal groove which serves to receive and support the latching rod. It is therefore also not possible that the long, self-supporting locking rod vibrates due to rhythmic shocks such as wave shocks and thus releases itself from the rest, because the locking rod is in the immediate vicinity of the locking pawl in the sliding block on which the locking pawl is mounted supports.

To manufacture the coupling, it is possible to attach a gear to the end of the locking rod and a toothed rack to the release button.It would also be possible to attach a disc to the end of the locking rod in a rotationally fixed manner and to attach the release button directly to the circumference of the disc or to link it with a handlebar

According to a further embodiment of the invention, however, a particularly simple and reliable solution is that the end of the locking rod is bent over to a drive crank, the free end of which engages in a recess which is formed on the underside of the release button, which in turn is guided in a vertical guide and is pushed up against the force of a spring. The coupling therefore does not require a single separate part, but is only replaced by training the necessary parts.

According to a further embodiment of the invention, the locking device is designed as a block, which is inserted as an end block in the rear end of the sliding guide. This block is especially made as a plastic part preferably in die casting and has the vertical guide for the release button and a lateral groove in which the end of the locking rod is inserted. When assembling, a compression spring is inserted at the bottom of the vertical guide, the release button is placed with its recess and pressed down, and then the latching rod is inserted laterally, its crank-like end engaging in the recess. - Then the end block is pushed into the end of the sliding guide, causing all parts in their mutual; functional assignment are recorded, without this, for example, a separate part would be required. With a suitable choice of plastic, low-friction storage of all moving parts is ensured, with no corrosion, for example caused by sea water or the like, provided the metal parts used are made of a suitable material. The actuation of the release button thus takes place smoothly even after prolonged operation, which greatly improves the operating and operational safety of the surfboard provided with the mast holder according to the invention.

In order to improve and simplify the operation even further, according to a further embodiment of the invention, a spring is attached between the slide rail and slide block, which prestresses the slide block to the rear. This spring balances the wind pressure that tends to move the sail and mast forward, and ensures that the mast can be easily moved in any direction with the boom at any time.

In principle, it would be possible to arrange a spiral compression spring between the bow end of the slide rail and the slide block. However, because of the risk of corrosion of such a spring, it is proposed to preferably use a strand of rubber or the like which is fastened between one end of the slide rail and the slide block. Since such a string spring must have a certain minimum length, and since, on the other hand, the slide rail cannot be extended to the rear because its extension is limited by the sword case, it would in principle be possible between any point of the sword case and the slide block on the top of the surfboard unclamp the strand spring.

For security reasons, however, the hidden attachment of the strand spring is preferred, which is achieved in that it is attached to the bu ^g- sided end of the slide rail, and preferably on an end block inserted into this end, between a longitudinal groove in the slide block and the adjacent inner wall of the Is guided through the slide, is guided over a deflection roller attached to the rear end block and is then attached to the rear end of the slide block. Thus, the strand spring is completely covered, has the length required for correct operation, but does not impair the effective use of the entire slide rail for the sliding movement of the slide block. In addition, the strand spring holds the two end blocks of the slide rail firmly together, so that fastening elements for holding these end blocks can be dispensed with.

The groove for receiving the rubber strand is arranged approximately diametrically opposite the groove for receiving the locking rod with respect to the longitudinal axis; in this way, if there is any play, the strand spring is prevented from displacing the slide block in such a lateral direction that the engagement of the latch with the notches of the latch rod is endangered.

As already mentioned at the beginning, it is desirable to provide an adjustable safety fastening that can be released in the event of an overload for fastening the mast foot pin. According to the invention, this is formed in the sliding block itself. In contrast to the known surfboard of DE-AS 27 47 057, in which two fixed safety attachments were provided for the mast foot, it is thus possible according to the invention to adjust the axial position of the mast with a safety attachment in relation to the surfboard even while driving.

For this purpose, the slide block has a vertical bore for receiving the mast foot pin, the tip of which has an annular collar, with a stop for this in the bore and a locking element which is pressed into the bore and is flexible after overcoming a releasing force, which element rests on the stop Raised ring collar. The mast base and thus the entire mast is fixed in its longitudinal direction, since the ring collar of the mast base is stuck between the stop and the locking element. However, the locking element is flexible after overcoming an adjustable release force, so that it releases the collar and thus the mast foot pin in the event of an overload.

In contrast to the ring spring of DE-AS 27 47 057, which has a much larger diameter than that Mast mast pin in the safety attachment according to the invention does not exceed the width of that of the mast foot pin, so that the entire safety attachment can also be accommodated in a sliding block. This would not be possible with the known safety fastening, since, due to its width, it would make such a wide sliding block necessary, with a correspondingly wide opening in the sliding rail, that there would be a risk that a surfer would get caught in the toe rail with his toes. As a result of the particularly narrow construction of the safety fastening according to the invention, it is only possible to use a correspondingly narrow slide rail which meets all safety requirements.

The safety fastening according to the invention largely requires the space available within the sliding block, so that this safety fastening could not be used together with the known latching device fitted in the sliding block, since there would otherwise be too long a sliding block for which the available sliding distance in the Would no longer be sufficient.

According to a further embodiment of the invention, the bore is designed as a through bore, the stop being formed by a pin parallel to the longitudinal axis and crossing the bore in the center, which in turn forms the pivot axis for the pawl, which is designed to engage in the locking notches of the locking rod. At the same time, this pin improves the bending stiffness of the sliding block, which is preferably made of plastic.

The locking element can be designed as a locking bolt movable radially to the bore, the direction of movement in the direction of the longitudinal axis of the surf boards is done. According to a further embodiment of the invention, the blocking element is a pin which is arranged transversely to the longitudinal axis and is displaceable in the direction thereof and which cuts the bore like a chord. This pin requires the shortest possible lengths, seen in the direction of the longitudinal axis, so that a short sliding block is possible. The pin is supported on its side facing away from the bore on the end of a cap screw which is arranged essentially parallel to the longitudinal axis. This head screw is arranged with its head on the bow side and penetrates with sufficient play an end plate attached to the bow end of the sliding block. On its shaft, i.e. inside the slide block, it has a compression spring which is supported on the one hand on a nut arranged at the free end of the shaft and on the other hand on the inside of the end plate. The compression spring ensures that the cap screw is always flush with the side of the head facing the end plate and is therefore perpendicular to this end plate with its shaft. If this shaft is deflected transversely to its longitudinal direction, then it automatically returns to the above-mentioned starting position, the magnitude of the restoring force being dependent on the tension of the compression spring, i.e. how far the screw nut is screwed onto the shaft against the compression spring.

According to a further embodiment of the invention, this nut is non-rotatable in a longitudinal guide, but is axially displaceable relative to the screw, so that one rotation of the screw from the outside is sufficient to increase or decrease the restoring force of the screw, depending on the direction of rotation.

The tip of this screw is supported against the pin; the pin is now pushed inwards then it deflects the tip of the screw against a previously set restoring force.

According to a further embodiment of the invention, a pointer is connected to the non-rotatable nut, which pointer is visible through a window in the top of the sliding block, with markings preferably being assigned to this window, so that the surfer can determine how large by looking at the sliding block the overload required to release the safety attachment is according to the setting.

In principle, when the surfboard is removed, it is possible to release the mast foot from the safety attachment by exerting an overload after it has been set to a low release load. In order to enable the solution of the safety attachment regardless of the set overload, it is proposed according to a further embodiment of the invention that above the shaft of the cap screw an acting on it, guided through the top of the slide block to the outside to deflect the shaft and thus to Loosening the mast foot is arranged. Preferably, the cap screw and thus also the pusher is arranged on the bow side from the hole for receiving the mast foot so that the pusher is located at a point which, during normal use of the surfboard, is outside the area of action of the foot of the user, especially since it is for the user is no reason in the foot _M astnähe to bring, as the release button for the latching device to move the sliding block is stationary on the rear-side end of the slide and the sword box.

The object of the invention is based on the beige added schematic drawing, for example, explained in more detail.

• Fig. 1 eine teilweise geschnittene Seitenansicht einer aus Gleitblock und Gleitschiene gebildeten, einbaufertigen Einheit,
• Fig. 2 einen Schnitt längs Linie II-II in Fig. 1, in größerem Maßstab,
• Fig. 3 einen Schnitt längs Linie III-III in Fig. 1, im gleichen Maßstab wie Fig. 2,
• Fig. 4 eine Draufsicht aus Richtung IV in Fig. 1 im gleichen Maßstab wie Fig. 1 und 2, wobei zur besseren Verdeutlichung einige Teile weggelassen sind, und
• Fig. 5 einen Schnitt längs Linie V-V in Fig. 4.

The drawing shows:

• 1 is a partially sectioned side view of a ready-to-install unit formed from a slide block and slide rail,
• 2 shows a section along line II-II in Fig. 1, on a larger scale,
• 3 shows a section along line III-III in FIG. 1, on the same scale as FIG. 2,
• Fig. 4 is a plan view from the direction IV in Fig. 1 on the same scale as Fig. 1 and 2, with some parts omitted for clarity, and
• 5 shows a section along line VV in FIG. 4th

In all figures, the same parts are identified by the same reference numerals.

In Fig. 1 a mast foot bracket is shown, which can be attached as a finished assembly in the deck of a surfboard.

The mast foot bracket consists of a slide rail 1 with a U-shaped cross-section, in which the free ends of the two lateral legs are angled toward one another. The slide rail 1 is formed from an extruded aluminum profile, which can optionally be pickled to improve the corrosion resistance.

A slide block 2 is inserted into the slide rail 1 from one of its ends, the outer contour of which is designed in accordance with the inner contour of the slide rail 1 in such a way that it has only little play, however is effortlessly slidable within the slide rail and is flush at its top with the outer upper edges of the slide rail (see Fig. 2).

The sliding block 2 is designed as a plastic part and is described in more detail in FIGS. 4 and 5.

The sliding block 2 carries a mast foot 3, which ends in a mast foot pin 4, which in turn is fastened in the sliding block 2.

The bow end (in Fig. 1 the left end) of the slide rail 1 is closed by a terminal block 5, which is made of plastic and is partially inserted into the slide rail 1. This part expands like a shoulder in such a way that the outer surfaces of the section protruding from the slide rail 1 are flush with their outer surfaces.

The end block 5 has on the port side, lower edge of a recess or longitudinal groove extending over its length, which is dimensioned such that it just allows the passage of a rubber cord 6. This rubber cord 6 is provided outside the slide rail 1 with a thickening, which is formed by turning over and fastening the free end.

The rear end is closed by an actuating device 7 which, as a housing, comprises a housing block 8, which is formed in one piece from plastic and is partially inserted into the interior of the slide rail 1, the part of which protrudes beyond the end of the slide rail is dimensioned such that its outer surfaces are flush with those of the Override the slide rail.

The housing block 8 is on the inside of the slide rail lying part on the same side as the rubber cable 6 with a recess which is a little wider than the rubber cable 6. In this recess a pulley 9 is rotatably mounted, over which the rubber cable 6 is guided for deflection. The axis of rotation of the rope pulley 9 is designed as a pin which sits in a rotationally fixed manner in the two side legs of the slide rail 1 and the housing block 8 and thus ensures its fastening, while the rope pulley 9 is rotatably mounted on the pin 10.

The free end of the rubber cord 6 is connected to a hook 11 which can be hooked into a hook hole 12 (FIG. 2) in the rear end of the sliding block 2. The course of the rubber cord 6 is clearly visible from Fig. 1, and it can be seen that the rubber cord 6 seeks to pull the sliding block 2 rearward due to its spring action.

The end block 5 can be held in the slide rail 1 by means of fastening pins, but in principle it is sufficient to fasten the end block 5 by the spring tension which is exerted on it by the rubber cable 6 and which endeavors to pull it towards the bow end of the slide rail 1 .

In the starboard-side, upper region of the slide rail 1, a locking rod 13 is arranged near its starboard-side leg, which extends parallel to the slide rail 1 and is rotatably mounted in the end block 5 and in the housing block 8. This locking rod 13 is made of round material and has milled notches 14 which face the sliding block 2 and which extend from mutually parallel and transverse to the slide rail 1 extending side surfaces are limited.

FIG. 2 shows a section along line II-II in FIG. 1, the lower run of the rubber cable 6 being shown in section, while the upper run and the hook 11 are omitted.

As can be seen from Fig. 2, the sliding block 2 adjacent to the rubber cable 6 and the locking rod 13 each have a recess or longitudinal groove, which enables the free sliding movement of the sliding block 2 relative to the rubber cable 6 or the locking rod 13, but in particular this far fixes that no vibration amplitude can form in the area of the block, which would be suitable, for example, to impair the function of the mast foot bracket.

The mast foot pin 4 is only shown broken off.

At the rear end, the sliding block 2 has a transverse cut 15 (FIG. 5), in which a latch 16 is pivotably arranged about a pin 17.

The pin 17 is embedded in the lower part of the sliding block 2 and extends parallel to its longitudinal direction. As can be seen from Fig. 5, the pin 17 extends over the entire length of the sliding block 2 and not only exercises the function of an axis of rotation for the latch 16, but also the function of a stiffener for the entire plastic sliding block 2 and how To be described later, the function of a stop for the lower end of the mast foot 4.

The upper part of the detent pawl 16 is supported on a detent spring 18 which is guided in a spring bore 19 (FIG. 5).

As can be seen from FIG. 2, the detent spring 18 presses the detent pawl 16 towards the detent rod 13, the detent 16 being shaped in such a way that it can fall into one of the notches 14 and with its surface facing the detent rod 13 snugly at the bottom of the respective notch 14 sits on.

In Fig. 2 the locked position of the latch 16 is shown; thinks now in Fig. 2, the locking rod 13 rotated by at least 90 °, then it can be easily seen that the notch 14 is no longer facing the latch 16, but points up or down. Here, the locking pawl 16 is no longer seated on the base of the respective notch 14, but on the outer circumference of the locking rod 13. In this state, the sliding block 2 can be moved effortlessly in the longitudinal direction of the sliding rail 1. If the locking rod 13 is now rotated back into its position shown in FIG. 2, the sliding block 2 continues to move until the locking pawl 16 engages in the next notch 14 and thus prevents further axial movement of the sliding block 2.

The mechanism by means of which the locking rod 13 can be rotated by at least 90 ° is designed as an actuating device 7, housed in the housing block 8 and shown in FIG. 3, which represents a section along line III-III in FIG. 1.

A vertical guide 20 in the form of a blind hole with a rectangular cross section is formed in the housing block 8 for the release button 21 with an equivalent cross section. In this vertical guide 20 is the Trigger button 21 to linear movements along the arrow shown and non-rotatably guided.

A return spring 22 is arranged between the bottom of the blind hole and the underside of the release button 21.

In its central area, but offset towards the underside, the release button 21 has a recess 23 which is designed as a through hole with a rectangular cross section.

The end of the locking rod 13 assigned to the actuating device 7 is bent over to form a crank 24, the end of which engages in the recess 23 such that when the release button is actuated in the arrow direction, the crank 24 carries out a pivoting movement in the arrow direction by approximately 90 °.

To guide the locking rod 13, the housing block 8 has a groove 25 formed in the longitudinal direction of the slide rail 1, in which the locking rod 13 is rotatably arranged. Within the movement path of the crank 24, the housing block 8 is recessed in such a way that the movement sequence described can take place undisturbed.

When assembling, the return spring 22 is first to be inserted into the housing block 8, then the release button 21 is to be placed on it and pressed down, and then the locking rod 13 with its crank 24 can be inserted laterally into the groove 25 or the recess 23.

Then the housing block 8 is inserted into the rear end of the slide rail 1, the cable pulley 9 is inserted and the pin 10 is driven in order to close all parts on the slide rail 1 fasten.

4 and 5, the sliding block and in particular the safety attachment for the mast foot pin 4 is shown. Here, the slide rail, rubber spring and locking rod are omitted for the sake of simplicity.

In Fig. 4, the mast base is also omitted.

In Fig. 5 locking pawl 16 and locking spring 18 are omitted.

The sliding block 2 has on its upper side a mast foot bore 26 into which the mast foot 4 can be inserted with only slight play.

This mast foot pin 4 is provided near its free end with an annular recess 27 which is bounded towards the end by a shoulder which projects in the radial direction and which delimits a collar 28. The side of the collar 28 facing the free end of the mast foot pin 4 is chamfered or rounded.

The pin 17 already described penetrates the bore 26 diametrically and in the longitudinal direction of the sliding block 2 and forms the stop for the downward movement of the mast foot pin 4 into the bore 26.

A locking cylinder 29 is arranged transversely to the pin 17 and protrudes like a chord into the bore 26 on its bow side.

The locking cylinder 29 engages behind the collar 28 of the mast base 4. It is essential that the locking cylinder 29 projects into the bore 26 by a smaller amount than the dimension of the radius of the Lock cylinder 29 is.

The locking cylinder 29 is preferably formed from a ground steel pin.

As can be seen from FIG. 5, a cavity 30 is formed on the bow side of the bore 26 and is closed on the end face of the sliding block 2 by an end plate 31.

The upper boundary wall for the cavity 30 has a central opening for the passage of a pusher 32, as well as an elongated hole 33 which runs parallel to the longitudinal axis of the sliding block 2 but is laterally offset in this respect.

The end plate 31 has an opening approximately at the level of the locking cylinder 29, which is penetrated by the shaft of a cap screw 34 with ample play.

The head of the cap screw 34 forms a radial collar adjacent to the shaft, with which it can lie flat against the end plate 31.

A square nut 35 is screwed onto the end of the cap screw 34, which is displaceable axially to the shaft in longitudinal guides (not shown in the drawing), but is prevented from rotating.

A pointer part 36 is fixedly connected to the nut 35, the tip of which is visible in the elongated hole 33 from the outside of the sliding block 2.

When the screw 34 rotates in one direction or the other, the square nut 35 and thus also the pointer part 36 translate in one direction or the other.

A compression spring 37 is arranged around the shaft of the screw 34 between the pointer part 36 and the inner surface of the end plate 31. The free end of the shaft of the screw 34 is tapered or rounded and is supported against the locking cylinder 29, the central axis of the screw 34 preferably being a little below the central axis of the locking cylinder 29.

• Wird der Mastfußzapfen 4 nach oben mit einer bestimmten Kraft gezogen, dann drückt der Bund 28 den Sperrzylinder 29 nach oben und bezüglich der Bohrung 26 nach außen. Wird eine bestimmte Kraft beim Ausziehen des Mastfußzapfens 4 überschritten, dann wird durch die auf die Spitze der Schraube 34 wirkende Kraft diese entgegen der Kraft der Feder 37 nach unten ausgelenkt, so daß der Sperrzylinder 29 bezüglich der Bohrung 26 radial nach außen und nach oben ausweichen kann.

The safety fastening shown for the mast foot pin 4 acts in the following way:

• If the mast foot pin 4 is pulled upwards with a certain force, the collar 28 presses the locking cylinder 29 upwards and outwards with respect to the bore 26. If a certain force is exceeded when pulling out the mast foot pin 4, then the force acting on the tip of the screw 34 deflects it downward against the force of the spring 37, so that the locking cylinder 29 deflects radially outwards and upwards with respect to the bore 26 can.

Here, the force which is to be exerted for pulling out the mast foot pin 4 is directly dependent on the pressure force of the compression spring 37 and thus on the position of the square nut 35, which compresses the compression spring 37 more or less. If the release force is to be reduced, then the screw 34 must be turned counterclockwise, whereupon the nut 35 migrates to the tip of the shaft (assuming a right-hand thread). With opposite rotation, the nut 35 moves in the opposite direction and compresses the spring 37 more.

The respective position of the nut 35 and thus the trigger force set in each case can be read directly through the tip of the pointer part 36 in the elongated hole 33, the edge of which can preferably be provided with a scale.

Arranged between the screw and the upper end wall of the cavity 30 is the pusher part 32, which projects beyond the outer sides of the sliding block 2 and continues inwards into the cavity 30 in the direction of the bore 26. If pressure is exerted on the pusher 32, then it presses on the spring 37 and thus the shaft of the screw 34 in a radial direction thereof, as a result of which the latter is then deflected. The locking cylinder 29 can then easily escape when the mast foot pin 4 is to be pulled out. When using the mast foot holder shown, it is embedded in the deck of a surfboard as shown in FIG. 1. The surfer's foot is located next to or behind the actuating device 7 such that the trigger button 21 can be actuated with the toes. If the release button 21 is actuated, then a force acting on the mast base 3 in the bow direction acts on it, which results from the wind force acting on the sail, while the force of the rubber cable 6 is effective in the opposite direction. The sliding block 2 is therefore basically in equilibrium, but since the wind pressure on the sail is of different sizes, it is necessary to deflect the. Sliding block in one direction or the other depending on the wind conditions to exert a more or less large support or counterforce by means of the boom (not shown) on the mast.

If the position of the sliding block 2 is to be changed, the trigger button 21 is actuated, this rotates the locking rod 13 via the crank 24, which in turn pivots with one of its notches 14 out of engagement with the pawl 16. Now the sliding block 2 can be moved until the release button 21 is released. Then the sliding block 2 moves in the selected direction until the pawl 16 engages in the next notch 14. The sliding block is then fixed in its position.

The function of the safety fastening accommodated in sliding block 2 has already been described; it should also be pointed out that the pusher 32 is located on the side of the mast remote from the surfer, so that there is no danger that the surfer may accidentally touch the pusher 32 with his foot.

Claims (19)

1. mast foot bracket for a sailing surfer, characterized by a flush in the deck, in the longitudinal axis extending, formed from an open hollow profile bar formed slide rail (1), a slidably mounted in this slide block (2) which a receptacle (26) for Detachable attachment of a mast foot pin (4), a locking device which is effective between the slide rail (1) and slide block (2) and is set up to fix it in at least two predetermined positions on the longitudinal axis, and a foot-actuated release button (21) for releasing the latching device, the release button (21) of the latching device being fixed in place. 2. mast foot holder according to claim 1, characterized in that the release button (21) is arranged at the rear end of the slide rail (1). 3. mast foot mount according to one of claims 1 or 2, characterized in that the latching device has a movable latching element (13), which is arranged inside the slide rail (1) and is essentially parallel to the longitudinal axis and carries latching formations (14), each of which one of the positions of the sliding block (2) is assigned, a latching counter-arrangement (16) which is arranged in the sliding block (2) and can be brought into engagement with one of the latching formations (14) at its predetermined positions, and a stationary on the rear side Control device (7) attached to the end of the slide rail (1), which carries the release button (21) and has a coupling (23, 24) connected to it and to the latching element (13), the latching element (21) being actuated by actuating the release button (21). 13) is movable in such a way that its latching configurations (14) can be brought out of engagement with the latching counter arrangement (16). 4. mast foot holder according to claim 3, characterized in that the latching element is designed as a rod (13), on one side of which the latching configurations are designed as notches (14). 5. mast foot mount according to claim 4, characterized in that the latching counter arrangement - preferably as one in the sliding block (2) an axis (17) parallel to the longitudinal axis is pivotally mounted pawl (16), which is designed for locking engagement in any of the notches ( ₁ 4), and that the coupling as a rotary drive (23, 24) for rotating the locking rod (13 ) is formed by such an angle of rotation that the notches (14) are rotated out of the engagement area of the pawl (16) or that training on the locking rod (13) lifts the pawl (16) out of engagement. 6. mast foot holder according to claim 5, characterized in that the locking rod (13) next to an inner wall of the slide rail (1) is arranged, that the notches (14) are facing away from this inner wall and that preferably the side surface of the slide block facing the inner wall (2nd ) has a longitudinal groove for receiving and supporting the locking rod (13). 7. mast foot holder according to claim 5 or 6, characterized in that the arranged in the control device (7) end of the locking rod (13) to a drive crank (24) is bent, and that the release button (21) in a vertical guide (20) and has on its underside a recess (23) into which the free end of the crank (24) engages. 8. mast foot holder according to claim 7, characterized in that the control device (7) in the rear end of the sliding guide (1) inserted housing block (8), in particular made of plastic, in which the vertical guide (20) for guiding the by a spring ( 22) pushed up release button (21) and a groove in which the end of the locking rod (13) is inserted. 9. mast foot holder according to one of claims 3 to 8, characterized in that between the slide rail (1) and the slide block (2) a spring (6) is attached, which biases the slide block (2) rearward. 10. mast foot holder according to claim 9, characterized in that the spring is a strand (6) made of rubber or the like. is attached to one end of the slide rail (1) and to the slide block (2). 11. mast foot holder according to claim 10, characterized in that the rubber strand (6) is attached to an end block inserted into the slide rail (1) at the bow end (5), between a longitudinal groove in the slide block (2) and the adjacent inner wall of the slide rail ( 1) is passed through a deflection roller (10) attached to the rear housing block (8) and attached to the rear end of the sliding block (2). 12. mast foot bracket according to claim 11, characterized in that the groove for receiving the rubber strand (6) with respect to the longitudinal axis is approximately diametrically opposite the groove for receiving the locking rod (13). 13. mast foot bracket according to one of claims 1 to 12, characterized in that an adjustable, releasable in the event of overload safety attachment for the mast foot pin (4) is provided in the sliding block (2). 14. mast foot holder according to one of claims 1 to 13, characterized in that the sliding block (2) has a vertical bore (26) for receiving the mast foot pin (4), the Tip has an annular collar (28), and that in the bore (26) a stop (17) for this and a pressed into the bore (26), after overcoming the overload-blocking element (29) are provided, which the on the stop (17) engaging ring collar (28). 15. mast foot holder according to claim 14, characterized in that the bore is designed as a through bore (26), and that the stop is formed by a parallel to the longitudinal axis, the bore (24) centrally crossing pin (17), which preferably the pivot axis for the pawl (16) forms. 16. mast foot holder according to one of claims 14 or 15, characterized in that the locking element is a transverse to the longitudinal axis, in the direction of which is displaceable pin (29), the tendon-like intersecting the bore (24), and that against the pin (29 ) on the side facing away from the bore (24) supports a cap screw (34) which is arranged essentially parallel to the longitudinal axis, an end plate (31) which is arranged perpendicular to the latter and which is attached to the bow-side end of the sliding block (2) penetrates with play and on its shaft carries a compression spring (37) which is supported on the one hand on a nut (35) arranged at the free end of the shaft and on the other hand on the inside of the end plate (31) and thus ensures that the screw (34) is perpendicular to End plate (31) sets. 17. mast foot holder according to claim 16, characterized in that the nut (35) is arranged in a longitudinal guide non-rotatable, but axially displaceable to the screw (32). 18. Mast foot holder according to one of claims 16 or 17, characterized in that with the nut (35) a pointer (36) is connected, which is visible through a window (33) in the top of the sliding block (2), and that preferred markings are arranged on this window (33). 19. Mastfußhalterungtnach one of claims 16 to 18, characterized in that above the shaft of the cap screw (34) acting on this, through the top of the sliding block (2) outwardly guided pusher (32) for deflecting the shaft and thus for loosening the mast foot pin (4) is arranged.

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