DE7534898U - Float for a surf watercraft - Google Patents

Description

Vibrating body for a watercraft

The invention relates to a floating body made of plastics for a watercraft with a mast and sails. In particular, the invention relates to a sailing prett on which the athlete is standing with his hands and is freely movable Holds the mast and the sail in such a way that a state of equilibrium is reached under the action of the wind and the float is moved in the respectively desired direction.

It is known to produce such a floating body or a sailboard in such a way that initially one outer shell is made of polyethylene. This can be reinforced by glass fiber inserts, with granules in the shape is given, heated and thereby liquid and then cliled. In this way arise Hollow body with a lance with polyurethane foam

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can be foamed / grounded. Such floats or Sailboards have the disadvantage that the reject rate in production is extremely high. This is on the one hand e. the uneven formation of the outer skin and on the other hand to an uneven foaming. In addition, the load-bearing capacity is similar Float severely limited

In particular, the high reject rate can be reduced in that the floating body is made of two parts v; ird. This is done in two different shapes for the lower and the upper part of the float Shells created. These can be made from a suitable polyester in conjunction with a glass fiber fabric be, so that a higher strength can be achieved. The shells have an outward-facing edge at the free upper edge circumferential flange, in the course of which the two parts can be glued together. Before are too these parts have been foamed with a polyurethane foam that is heavily permeated with blowing agent. In the preparation of Such floating bodies or sailing boards have the disadvantage that they are almost entirely manual work is required and the manufacture of the trays requires an unusually long labor time. When finished The floating body is the outward-facing, circumferential flange a source of accidents Floating bodies or sailing boards are of particular importance because, on the one hand, they operate at relatively high speeds is driven and, on the other hand, the largely unprotected athlete often falls into the water.

The object of the present invention is therefore to create a floating body or a sailboard that with can be produced at a much lower cost in a much shorter time without any losses

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visibly result in a uniform manufacturing quality and the strength of the finished product.

This is achieved according to the invention in the floating body explained in more detail at the outset in that it consists of a closed hollow body with walls made of layered material.

Such a floating body is characterized by high load-bearing capacity and low weight. The outer layer of the layer material expediently consists of Polyurethane paint with at least one layer of rigid polyurethane foam on its inward-facing surface is arranged. The layer of non-foamed polyurethane varnish provides a smooth outer skin of high toughness and dynamic load capacity · It has a high elastic strength combined with a high abrasion resistance. The outer skin, which is preferably 2 mm thick, provides uniform and continuous protection for the inside arranged rigid polyurethane foam. The any physical foaming agent containing integral skin foam can be applied to the outer skin without an adhesion promoter just two minutes after it has formed and provides the internal stiffening for the float. The final strength results from the combination of the two intimately connected polyurethane layers, with two integral foam layers also being provided can"

The hollow body is expediently made up of two shells, which are secured by polyurethane adhesive in the area of the contact surface are connected to each other. For this purpose, the thickness of the integral skin foam can be in the range of

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Contact surface be reinforced, for which purpose a circumferential, removable cover plate is provided on the molds in the edge area which is back-foamed, creating the flat contact surface. Gluing can be done without pressure Room temperature.

Such a floating body can be produced in an extremely short time and is an approximately homogeneous structure is free of local solidifications and is therefore uniformly elastic. The risk of cracks during the Use is largely eliminated.

In the drawing, two exemplary embodiments of the invention are shown, which are based on the following description are explained in more detail. It shows:

Fig. 1 is a cross section through a

Floating body made of two symmetrical half-shells and

Fig. 2 is a longitudinal section through the front part of a made of two asymmetrical parts Float.

The floating body shown in FIG. 1 has two sym 'mi's half-shells 10 and 11 en with respect to the strömungstechnisc ^ requirements of the lower half-shell 11 are shaped. Each of the half-shells 10 and 11 consists of an outer polyurethane lacquer layer, the thickness of which is selected between 1 to 5 mm, depending on the length of the floating body, between 3 and 5 m. A closes to the inside of the polyurethane varnish layer 12

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Polyurethane hard foam layer 13, two hard foam layers 13 and 14 being expediently provided. ; Layers 13 and 14 can usually have a total * 5 to 8 mm thick. A greater® layer thickness is expedient in the areas 15 of the contact surfaces 16 provided, the upper free edge of the hollow mold correspond. The reinforced areas 15 and a further material reinforcement 17 of the hard foam layers 13, 14 can also be provided in the area of a shaft 18 for the sword. A comparable reinforcement 15, 17 is in the area of the bearing, not shown, for the mast provided.

See symmetrically between the contact surfaces 16 of the two Shells 10 and 11, an adhesive layer 19 is provided, which also consists of polyurethane. Di3 adhesive layer 19 connects the layers 12, 13 and 14 of both parts 10 and 11 intimately mifceinandeir, so that ßin completely closed cavity 20 is created. The cavity 20 is evenly enclosed by the layer material 12, 13, 14, wherein a certain reinforcement is given in the area of the contact surfaces 16 by the areas 15, the However, the homogeneous design of the entire wall does not interrupt, which leads to a uniform deformation of the entire float leads under all occurring loads.

In the exemplary embodiment according to FIG. 2, the upper part 10 is designed to be flatter than the lower part 11. Accordingly, lie the contact surfaces 16 and the adhesive layer 19 just below the upper, substantially horizontal deck surface to support the athlete's feet. Otherwise, the floating body according to FIG. 2 is designed in the same way like that according to FIG. 1. The mast bearing is only illustrated by the center line 21.

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"For the production of the hollow bodies 10 and 11 foci one or two ischalenlöipigö; ij ^ j ^ tof ^ rmen used, which can be coated inside with a release agent * Vie Teflon. There is also the possibility, in addition to the components of the polyurethane -Lack§s to provide an internal Jirennmittel the layer 12. At the upper edge of the mold cavities there is a circumferential cover plate, which protrudes somewhat into the plane of the mold cavities and is intended for the formation of the smooth contact surfaces 16 and enti? J> Rechön & von \. To produce the walls of the hollow body, a layer of polyurethane varnish in a suitable mixing ratio of the components and, if necessary, with a dye additive is first spread out in the mold, with the core inserts for the shaft 18 for the sword and After a pot life of 1 to 2 minutes, the polyurethane paint has solidified to form the layer 12 without shrinking That the visual layer 13 can be foamed in. The layer 13 is made thicker in the areas 15 and can then be covered by an optionally thinner layer 14 also made of integral polyurethane foam.

The layer material 12, 13, 14 created in this way is then after Removing the edge plate is molded and can be used immediately can be processed further, i.e. two layer material parts 10 and 11 can be joined together by an adhesive layer 19 get connected,. The hardening time is about 20 minutes at room temperature.

The step surface of the upper part 10 can be coated with guar sand be. Other granules 22 or SarJ can also be used. or gravel or a rubber layer can be used. The appropriate materials can first be put into the mold are given so that when the polyurethane varnish is introduced to produce the layer 12, the materials are intimately

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content) of this layer. The strength of the Layer 12 can be enlarged somewhat for this purpose.

lower part 11 is always designed in a flow-favorable manner and can be provided with an integrally formed fin. the The aerodynamic design of the lower part 11 and the corresponding design of the shape are not an obstacle represents to produce the upper part 10 with the same shape. This is due to the fact that the athlete - * is anyway supported only on one side of the deck.

The floating body according to the invention has a much higher load-bearing capacity than the known floating body, but is considerably lighter. Due to the essentially homogeneous design of all walls, the body is produced uniformly and without tension, so that no tension cracks occur even after prolonged use. Should the outer skin 12 be damaged by external mechanical influences, then a repair by means of polyurethane varnish is easily possible. The floating body has on the outside raised no flanges and is also otherwise completely smooth, so that a serious U _n is off event source.

- Expectations -

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Claims (12)

β »t» * (ft ** a nc claims 1. From plastics constructed float for a ~ ^ Vasserfahrzeug with mast and sail, characterized gekannzeich "net that it consists of a closed hollow body having walls of sheet material (12, 13, 14). consists. 2. Floating body according to claim 1, characterized in that that an outer layer (12) of the layer material consists of polyurethane varnish, on the inward facing Surface of at least one layer (13, 14) made of polyurethane Rigid foam is arranged. 3. Floating body according to claim 2, characterized in that two polyurethane foam layers (13, 14) of different strengths are provided. 4. Floating body according to claim 2, characterized in that the outer polyurethane paint layer (12) has a has a smooth and pore-free surface « 5. Float stabbed one of claims 1 to 4, characterized in that the hollow body consists of two shells (10, 11), which are connected to each other. 6. Floating body according to claim 5, characterized in that that the hollow body is constructed from two symmetrical half-shells (10, 11). 7. Floating body according to claim 4, characterized in that the hollow body consists of a lower trough-shaped Shell (11), which is covered by an upper substantially flat shell (10) (Fig. 2). 7534898 27.0177 • »· ι» · t • · " Hi" " "Of" D 8. Floating body according to one of claims 1 to 7, characterized in that the polyurethane foam layers (13, 14) are formed widened in the area (15) of the contact surfaces (16) of the shells (10, 11). 9 · Floating body according to claim 8, characterized in that the shells (10, 11) in the area of the Contact surfaces (16) are glued together. 10. Floating body according to claim 9, characterized in that the shells (10, 11) by I-olyurethane adhesive are connected. 11. Floating body according to one of claims 1 to 10, characterized in that the Pclyurethan foam layers (13, 14) in the area (17) of the sword shaft (18) and of the mast bearing holder (21) formed stronger are. 12. Float according to one of claims i to 11, characterized in that the slip resistance in the outer layer (12) of polyurethane paint of the upper shell (10) increasing granules (22) ^ is embedded. • such as resin sand, sand, gravel or the like 7534898 27.0177