WO1998042418A2

WO1998042418A2 - Sliding board

Info

Publication number: WO1998042418A2
Application number: PCT/EP1998/001749
Authority: WO
Inventors: Michael Ritter
Original assignee: Boards Unlimited Sportartikel Gmbh & Co. Kg
Priority date: 1997-03-25
Filing date: 1998-03-25
Publication date: 1998-10-01
Also published as: FR2761273A3; JP3055995U; AT2290U1; DE29705403U1; WO1998042418A3; AU7210098A; FR2761273B3

Abstract

The invention relates to a sliding board with an upper surface to stand on and a lower surface to slide on (2). Said board has a central sliding construction (3) protruding downwards and a guiding construction (4), which, when seen from the direction of travel, extends and protrudes downwards on both sides at least in the direction of travel. The inventive board is characterized by its blown plastic hollow body design with inner reinforcement strips or points (10) devoid of in situ foaming. The manufacturing method for the inventive sliding board comprises the following steps: a) extrusion of a flexible hose-shaped hollow plastic body from an extruder, b) introduction of said hollow plastic body into a sliding board mold, and c) blowing the hollow plastic body to form a sliding board. The mold enables both reinforcement strips or points to be formed on at least one of the halves of the shell and thermal soldering of said reinforcement strips or points with the opposite half of the shell.

Description

Gliding board

The present invention relates to a sliding board, that is to say a sports device on which a board driver can slide down a slope and a method for the production thereof. Such gliding boards are generally known as snowboards, but their application possibilities are not limited to snow or artificial snow, but also to slopes which have been otherwise prepared, e.g. Sand dunes or can also be used in water.

Sliding boards or snowboards are known in the form of essentially flat boards with waisted lateral outer edges and bent bow and stern. A downward sliding surface is flat and unstructured. The gliding board is somewhat flexible and is steered by the waisted outer edges in the event of a deflection due to one-sided weight loading.

Such slide boards are relatively demanding in terms of the board rider's ability to ride and are hardly suitable for children or non-athletic people.

This is reinforced by the steering mechanism, which leads to a drift movement when cornering, that is to say a speed component which is transverse with respect to the board orientation. Accordingly, larger transverse forces occur, which is why these known slide boards are equipped with foot straps or ski binding-like holding devices for special shoes. This means that the board driver is in "bound" to the board to a certain extent. Therefore, he cannot simply change the position of his feet on the gliding board or take one foot off the board while standing or when driving slowly. To avoid falling over while driving or standing, some practice with the gliding board and a good sense of balance required.

Furthermore, such sliding boards are made from a wooden or foam structure provided with a smooth plastic sliding surface, which generally has steel edges. Such a sandwich structure is very complex and expensive to manufacture. Such boards are also prone to wear.

Efforts have so far been made to bring about improvements, but these have been overshadowed by the associated disadvantages. For example, DE 195 04 464 Cl describes a gliding board in which a controllable straight-ahead travel is not possible, since the control skids are opposite in relation to their running direction. Controlled control is also not possible because the board cannot be tilted to an edge radius.

Another suggestion for improvement, DE 27 11 930 AI, describes a device for sliding on snow in which, due to the design of the sliding surface, stable, controllable straight-ahead driving is not possible. The control is problematic here too.

The invention is therefore based on the technical problem of specifying a robust sliding board with usage properties, which enable use by children or inexperienced or unsportsmanlike people and which is easy and inexpensive to manufacture.

According to the invention, this problem is solved by the features of claims 1 and 10. Advantageous embodiments are described in the subclaims.

According to the present invention, a slide board is provided with an upper-side tread surface and a lower-side slide surface with an elongated, central and downwardly projecting slide structure in the direction of travel and, viewed in the direction of travel, at least one elongated and downwardly projecting guide structure on both sides of the slide structure , which is convexly curved with respect to the sliding structure and does not protrude far downwards. The slide board is designed as a blown plastic hollow body with inner struts or points and without foaming.

With this gliding board, the protruding sliding structure in the middle has the task of enabling a largely unchecked straight-ahead drive and thus also a use on flat beginners' slopes. The sliding structure must therefore be designed in such a way that the sliding board can be carried largely by itself on a somewhat firmer surface when driving straight ahead and with a medium weight load. Their shape should be based on the lowest possible sliding resistance. Due to the height difference between the sliding structure and the guiding structure, snow or sand can be displaced laterally from the convexly curved fillets. By defined Radii are influenced by the edge grip and the steering behavior. A radius that is too large would lead to a deterioration of the edge grip. Curves could then no longer be initiated.

According to the invention, a simple and also very light and easy-to-handle method of manufacturing the sliding board is a blown hollow plastic body with inner struts or struts for a sufficiently stable hollow chamber structure. As a result, such additional material can be added to additional support material and the additional weight, e.g. foaming can be dispensed with. The slide board is advantageously made in one piece. Due to the manufacturing structure, the board is very robust. The structure with webs advantageously contributes to the longitudinal stability and rigidity.

In the slide board according to the invention, the user is preferably without additional connecting elements, similar to a skateboard to the side of the direction of travel.

For this purpose, the sliding structure is advantageously a ski-like structure which, in a preferred embodiment, has at least one concave longitudinal recess and, next to the recess or recesses, straight-edged sliding surfaces.

With regard to the sliding properties and the necessary contact surface, a sliding structure that is not too wide, but continuous over the length of the sliding board, is advantageous. In contrast, the lateral guide structures have the function of causing the sliding board to corner when subjected to lateral loading and correspondingly tilting of the sliding board. For this purpose, according to the invention, they are not designed to protrude downward as far as the sliding structure and are convexly curved relative to it. If you imagine the slide board on a solid surface, the steering movement corresponds to a tilting of the slide board around its longitudinal axis, subsequent contact between the guide structure and the surface and cornering by influencing the sliding properties due to the curved shape of the guide structure. On a flexible surface, this tilting movement corresponds more to a change in the relative application of force to the sliding structure and the guiding structures.

Since the guiding structures have the best possible guiding properties, to put it graphically, “grip”, and their carrying or sliding properties should not appear when driving straight ahead, they are in a simple and advantageous embodiment with a simple narrow cross-sectional profile, that is to say as rail projections, The guide structure is integrated in the vertical edge of the gliding board.

The sliding surface of the sliding board should not be too strongly structured overall in favor of the straight-ahead driving properties. A favorable compromise between straight-ahead driving characteristics and defined steering behavior lies in the choice of only one guide structure on each side of the sliding board. The driving properties can be influenced by the profile and the curvature of the guide structures, but above all also by the extent to which the sliding structure protrudes more downward than the guide structures. The smaller this difference, the more the straight-ahead driving is braked and the more clearly the gliding board reacts to the weight shift by cornering. On the other hand, a bigger difference places higher demands on the sense of balance of the board driver. Of course, these subtleties of the design of the total sliding surface of the gliding board must also be seen in connection with the respective driving surface.

The guide structures are embodied so that they are flush with an outer edge of the sliding board in the aforementioned rail design, so that the lateral closure of each guide structure is identical to the outer edge. Not only does this result in an elegant, uniform appearance due to the inevitably waisted shape of the gliding board, but also, due to the gliding board thickness that then appears as the height of the guide structure, so that it has a particularly good grip when cornering. In addition, such an optimized sliding board shape also offers manufacturing advantages.

In an advantageous embodiment of the present invention, a braking device can be provided. For this purpose, for example, a braking projection can be formed on the rear of the sliding board, which has a pronounced profile for optimizing the braking effect and which projects transversely to the direction of travel, that is to say transversely to the sliding structure. Braking is then carried out by loading the sliding board rear while driving. So that the braking projection has as little impact as possible on driving straight ahead , it protrudes less far than the sliding structure downwards, it is best to install it in an upwardly bent part of the sliding board rear, so that it only comes into contact with the ground when the sliding board tilts clearly about its transverse axis.

As can be seen from the above explanations of the shape of the sliding surface, a cornering line of the sliding board according to the invention corresponds to a curved line whose curvature lies between the (stronger) curvature of the guide structure inducing cornering and the straight configuration of the central sliding structure. The extent to which the cornering line tends towards one or the other of these two limits depends on the asymmetry of the load on the sliding board by the board driver.

It is typical of the slide board according to the invention that no or only a slight drift component occurs, so that the lateral forces when cornering are relatively low with this type of slide board. This makes the gliding board according to the invention easier to control and in particular also means that a non-slip tread on the gliding board is sufficient and no foot straps have to be provided. This increases the freedom of the board driver when using it, and the difficulties, especially for beginners, in learning are greatly reduced.

In connection with this, the flexibility and versatility of use is increased. You can also sit or lie on the gliding board or use it like a children's toboggan. Accordingly, the manufac tion simplified because a non-slip tread surface can be easily produced by a suitable profile and a suitable choice of the gliding board material or by attached non-slip tread marks.

A suitable material for the slide board according to the invention is polyethylene, but polyamides and other extrudable blown plastics are also suitable. A method according to the invention for producing a sliding board has the following steps:

Extruding a tubular plastic hollow body from an extruder;

Inserting the plastic hollow body into a slide board mold; Blowing the sliding board from the hollow plastic body, the webs or points being formed by the shape on at least one of the opposing shell halves; thermal welding of the composite webs or points to the opposite half of the shell.

An exemplary embodiment of the invention generally described above is explained below with reference to FIGS. 1 to 5. In detail shows:

Fig. 1 is a bottom view;

2 shows a front view with the underside pointing upwards;

3 shows a side view with the underside of the sliding board according to the invention pointing to the left; FIG. 4 shows a schematic sketch of a cross section, seen in the longitudinal direction, through the sliding board along the line IV-IV from FIG. 1; and

Fig. 5 is a plan view of the glietboard, with additional contour lines are drawn on the bow and stern.

1 shows a bottom view of an embodiment of a sliding board 15 according to the invention, the front end, that is to say the bow 12, of the sliding board 15 being at the top and the rear end or the rear 8 being at the bottom. In the middle of the sliding board 15, two parallel strips run from the bow 12 to the stern 8, which represent sliding surfaces 6 of a central, protruding sliding structure 3. The sliding structure 3 also has a concave recess or depression 5 between the two sliding surfaces 6. The flat tapered edges 13 prevent the board from digging into the blade area.

This is clear from the front view in Fig. 2, in which it can be seen that the recess 5 is relatively flat, i.e. thus significantly less deep than the height by which the sliding structure 3 is set back as a whole in relation to the parts of the sliding surface 2 lying to the side of it, that is to say the underside of the sliding board.

Overall, the sliding structure 3 forms a tread with straight side edges, which runs over the entire length of the sliding board. In contrast to the outer contour of the sliding board 15, the sliding structure 3 is not fitted. 1 and 2 also show that narrow rail-like edges 4 are provided as guide structures on both sides of the ski-like sliding structure 3 behind the recessed part of the sliding surface 2 and on the lateral edge of the sliding board. As can be seen in FIG. 2, these protrude less than the central part of the sliding surface 2 than the central sliding structure 3 and, as can be seen in FIG. 1, are furthermore over most of the length of the sliding board in relation to the central sliding structure 3 convexly curved. This convex curvature coincides with the outer contour of the sliding board, that is to say the lateral outer edges 7 (FIG. 2) with which the guide structures 4 are integrated, that is to say are continuous as seen from the side. Accordingly, the gliding board has an overall lateral fit corresponding to the shape of the guide structures 4.

3 shows a side view of the slide board, in which the two lines on the left edge of the slide board represent the difference in the protrusion of the slide structure 3 and the guide structures 4. The term sliding surface summarizes the underside of the sliding board, which has the sliding structure 3, the guide structures 4 and the intermediate areas in between. It can be seen from FIGS. 2 and 3 that the bow and stern 8 of the sliding board are bent upwards. The bending up of the bow essentially has the function of preventing immersion in softer ground, eg deep snow. The bending of the tail 9 enables the attachment of a braking projection 9 shown in FIG. 1, which extends transversely to the ski-like sliding structure 3 and which is flush with the rear 8 at the rear. The braking projection 9 does not come during normal driving or hardly touches the ground. It is only used when the board driver puts so much strain on the rear 8 that the board tilts about its transverse axis with the rear 8 resting on the ground. In addition, the bends at the bow and stern 8 are important for certain driving maneuvers, for example when either the bow or stern is loaded on one side and is used as a pivot point for rotating the gliding board on the spot.

4 shows a schematic cross section through the slide board along the line IV-IV from FIG. 1. In addition to the details already explained, strut webs 10 can be seen, which are provided in pairs between the step surface and slide surface by corresponding grooves in the step surface 1 of the slide board, that is, the two shell halves of the sliding board 15 are formed continuously.

During manufacture, the strut webs 10 are welded to the bulges of the lower shell half or sliding surface at points 14, 16, 18. The blown hollow body made of polyethylene in the present exemplary embodiment has a wall thickness of 2 to 4 mm, preferably 3 mm. The webs 10 are welded in one step with the blowing of the extruded hollow plastic body in the blow mold. In the case of continuous webs 10, cavities 17 are formed which are closed off from one another.

Finally, in FIG. 4 three dimensions are designated by the reference symbols d, h and b: b denotes the width of the tread surface 1 of the gliding board, which are chosen to be smaller than usual, in particular when used as a children's snowboard can. It should preferably be matched to the usual shoe size of the target group of users. In particular, it can be thought of the production of different sized boards for different age groups of users. d denotes the “height difference” between the central sliding structure 3 and the lateral guiding structures 4, that is to say the amount by which the sliding structure 3 projects further than the guiding structures 4. Due to the total height of the outer edge 7 with the lateral guiding structure 4 and the additional “height” d of the sliding structure 3 results overall in the maximum sliding board thickness h.

The radius ratio R1 / R2, which contributes to controlled straight-ahead and cornering, is at the waist (section IV-IV) between 1.2 to 1.6, preferably 1.4. Different circle segments are used for the curved surfaces 2 and 5. The height ratio h / d, which serves to initiate the curve by tilting the sliding board 15, is between 5.0 to 5.6, preferably 5.4. The outer edge 7 runs almost vertically and ends on the underside of the sliding board in the rail-like edge 4 which forms the guide structure.

The webs 10 are also shown in FIG. 5, since they are open and visible from the tread surface 1, that is to say from the top, of the sliding board. This facilitates the manufacture of the slide board shown in the figures by blowing a hollow body with polyethylene. As a result, shapes can be produced which are single-walled, which in FIG. 4 corresponds to an individual continuous circumferential line in cross section. The grooves of the struts that are exposed towards the tread surface 1 Exercise bars can be covered in a further step, which, however, involves a higher price and a greater weight of the gliding board.

It is advantageous to provide the exposed grooves in the tread surface 1 instead of the sliding surface 2, so that they cannot adversely affect the sliding properties of the sliding surface 2. In addition, snow or sand that has been “washed up” can be discharged onto the stand area 4.

5 also shows contour lines at the bow and stern of the gliding board, which symbolize the bend which can already be seen in FIG. 3.

5 shows the treads 11 on the tread 1, which consist of matt non-slip rubber coverings which are glued into corresponding shallow depressions on the tread 1. Here comes as material e.g. Neoprene or foam rubber. The oval drawn in on the floor in FIG. 5 serves to affix a manufacturer's mark, which can also be designed as a non-slip tread.

The details of the slide board according to the invention described above can also be essential to the invention individually or in combinations other than those shown.

Claims

claims

1. Sliding board with an upper-side tread surface (1) and an underside sliding surface (2) with an elongated, central and downwardly projecting sliding structure (3) in the direction of travel and, viewed in the direction of travel, on both sides of the sliding structure in each case at least one elongated and downwardly projecting guide structure (4), which is convexly curved relative to the sliding structure (3) and projects less far downwards, characterized in that the sliding board is designed as a blown hollow plastic body with internal struts or points (10) and without foaming.

2. Sliding board according to claim 1, wherein the sliding structure (3) has a ski-like shape with a concave longitudinal recess (5) and straight-edged sliding surfaces (6).

3. gliding board according to claim 1, wherein the sliding structure (3) is formed continuously over the gliding board length.

4. gliding board according to claim 1, wherein the guide structures are simple narrow rail projections (4).

5. sliding board according to claim 1, in which on both sides of the sliding structure (3) each have a guide structure (4) is provided.

6. gliding board according to claim 1, wherein the lateral outer edges (7) of the gliding board, seen in the direction of travel, are flush tegrated with a leadership structure (4) are formed.

7. sliding board according to claim 1 with a less than the sliding structure (3) protruding and transverse to the rear (8) extending braking projection (9).

8. gliding board according to claim 1, wherein the tread (1) is non-slip and without foot straps.

9. gliding board according to claim 1 made of polyethylene.

10. A method for producing a sliding board, which comprises the following steps:

Extruding a tubular plastic hollow body from an extruder;

Insertion of the plastic hollow body into a slide board shape;

Blowing the sliding board from the hollow plastic body, the webs or points being formed by the shape on at least one of the opposing shell halves;

thermal welding of the composite webs or points to the opposite half of the shell.