EP0066177A1 - Security hook for a harness, especially for windsurfers - Google Patents

Abstract

Safety hook for trapezoidal belts, in particular for windsurfers, which consists of a hanging bracket attached to a hook plate, which receives the trapezoidal rope, the hanging bracket being designed so that it has a wide contact area for the trapezoidal rope. In this way it is avoided that the rope loops around the hook.

Description

The invention relates to a safety hook for trapeze belts.

Trapeze belts are used especially by windsurfers, mainly to make it easier to hold. However, trapeze belts are also used in sailing. The trapeze belt covers the upper body of the athlete. A mostly hook-shaped device is arranged in the chest area with which the athlete can be detachably attached to the rig of the windsurfer or to parts of the sailing boat. When windsurfing, it is usually attached to a rope loosely attached to the boom, the so-called trapeze rope, or directly to the boom.

The known trapezoidal belts have the disadvantage that in the event of a fall, in particular in a spinning or turning fall, the harnesses can loop around the hook of the trapezoidal belt and in this case are difficult to pull off the hook. This can put the athlete in extremely dangerous situations.

Trapezoidal hooks are also known which counter this danger by increasing the safety by additional devices. For example, hooks are known which open when a rip cord is pulled so that the rope can be removed more easily. The obvious disadvantage of such safety hooks is the complex construction and the susceptibility to malfunctions, since the trapezoidal belt is strong Is exposed to stresses and environmental influences such as salt water and sand.

The object of the invention is to provide a safety hook for trapezoidal belts, in which it is avoided that the trapezoidal ropes or corresponding devices can loop around the hook or this danger moment is reduced and, if necessary, the ropes can be easily stripped off.

The invention is based on the finding that this object can be achieved in a simple manner by a special geometric configuration of the hook.

The invention relates to a safety hook for trapezoidal belts, especially for windsurfers, which consists of a hanging bracket attached to a hook plate, which receives the trapezoidal ropes, and which is characterized in that the hanging bracket has a wide support area for the trapezoidal ropes.

In the case of the hooks known to date, the suspension bracket consisted of round steel wire. This results in a very small, almost punctiform contact surface of the tamp. In contrast, a broad contact area for the trapezoidal ropes on the suspension bracket is proposed according to the invention.

The wide contact area enables a geometrical design of the hook, which guarantees is achieved that the trapezoidal rope can not loop around the hook, or this danger is reduced and the rope can easily be stripped, even under tensile load, or is pulled off by itself when the train is pulled.

The contact area is preferably more than 10 mm and is usually between 20 and 70 mm, in particular 30 to 50 mm. The values given relate to hook sizes which are generally customary today, but since, as will be explained in more detail below, the geometry of the suspension bracket itself leads to the advantages according to the invention, the values given can be correspondingly lower or higher for smaller or larger hooks.

According to a preferred embodiment, the support area b should be larger than the projection of the length a of the hook tongue 5 onto the hook plate 2.

If the aforementioned condition is met, then the hook is rotated by the trapezoidal rope 3 when the same is rotated about a perpendicular to the hook plate 2 as the axis of rotation, which means that the hook does not wrap around the trapezoidal rope in the event of a fall. In order to achieve a safe release of the hook during rotation, it is advantageous to make the length of the hook tongue significantly smaller than the width of the contact area. This is also because in practice the rotation takes place in varying spatial levels and not only in the ideal vertical level. The

The geometry of the hook should also take these circumstances into account, which is realized in particular when the support area b has 1.2 to 2 times the length a of the hook tongue 5.

On the other hand, even with a hook, the length of which is somewhat greater than the contact area, at least in most cases there will be no looping with the trapezoidal rope, so that such embodiments also have the advantages according to the invention at least in part.

If the hook tongue 5 is arranged parallel to the hook plate 2, then in the preferred embodiment mentioned the length of the hook tongue 5 must be shorter than the width of the hanging bracket 1 at the point at which the trapezoidal rope 3 is held in the normal state. This is the area of the greatest hook curvature in the case of trapezoidal ropes which usually lead slightly upwards. It depends on the width of the hook on this area where the rope is guided because the rotation of the hook takes place around the rope, and not on the width of the hook at its base where it merges into the hook plate.

The length of the hook tongue is defined as the distance on the plumb line between trapezoidal ropes 3 or the contact area where the trapezoidal ropes are held on the hook and the hook front end 6. It is this length that must be twisted out of the rope when twisting. ,

Whether the hook is twisted out of the rope or the rope twists around the hook also depends on the angle that the hook tongue 5 makes to the hook plate 2. If the hook tongue 5 is inclined away from the hook plate 2 at an angle, the hook can be rotated more easily from the trapezoidal belt. It is assumed that there is a dependency according to an angular function. In any case, the relationship is fulfilled if the projection of the length of the hook tongue 5 onto the hook plate 2 is smaller than the width of the hook. This means that the hook can be less wide if the hook tongue is inclined away from the hook plate.

Conversely, it is possible to incline the hook tongue 5 towards the hook plate 2. In this embodiment there is the disadvantage that the hook is more difficult to detach from the rope or, in other words, the hook must be wider. This is equally dependent on the angle of inclination and it is assumed that the same angle function applies here, only the other way round, as in the case of the hook inclined away from the hook plate. In other words, in this embodiment the hook must be wider than in those embodiments where the hook tongue is arranged parallel to or away from the hook plate. However, the advantage of this embodiment is that the harness is largely held in place and does not slide downwards, which is advantageous in practice.

The rear part 7 of the hook does not have to be perpendicular to the hook plate, but can also be up or be directed downwards.

Preferably, the suspension bracket has a tapering, preferably continuously tapering, profile in its projection onto the plane of the hook plate 2 in the direction of its front end 6.

This geometric configuration can also be implemented independently of the aforementioned features. The tapered profile has the great advantage that a trapezoidal rope bwz around the hanger. Hook has looped, easily by hand and this can also be removed under tensile load, or pulls itself off when subjected to the appropriate force. A tapered profile of the hook is only possible with the wide contact area provided according to the invention.

It is preferred that the suspension bracket has a profile that tapers at an angle of 20 to 40 °, preferably 30 °. The angle between the two legs or sides of the suspension bracket is meant here.

The hook can have a wide variety of shapes, also in combination, in its top view and in its side view.

As mentioned in the top view, the hook, as mentioned, can be tapered towards the front end 6: this can be continuous or continuous. However, the taper can also be slight starting from the base 8 up to the area where the trapeze rope is held and then stronger towards the front end 6. However, the part between the hook plate and the support area for the trapezoidal ropes can also have a uniform width. The hook can also have a constant width from a base 8 to the front end 6. Furthermore, it is contemplated that the hook at its front end 6 has a greater width than where the trapeze rope 3 is held. Such an embodiment has the advantage that the trapezoidal rope is better held in the hook and falls less easily. Furthermore, the tapering or widening of the hook towards the front end can take place in a concave or convex shape.

The hook front end 6 is preferably rounded or flattened. Seen in side view, the hook tongue 5 can be straight or curved, for example in the form of an inverted "S". The part between the hook plate and the support area can also be straight, inclined or curved upwards or downwards.

The size of the hook and the radii of curvature naturally depend on its use and are in particular matched to the tamp diameter.

To be able to hook easily Ampen with the hook in the _T, the distance between the hook 6 and the front end plate 2 must be sufficiently large. This Ab Stand c is preferably in the range between 0.5 and 5 cm and in particular around 2 cm.

The Erifndung is explained below with reference to the drawing which shows an exemplary embodiment.

• Fig. 1 eine Draufsicht auf den Sicherheitshaken, und
• Fig. 2 eine Seitenansicht des in Fig. 1 gezeigten Hakens.

Show it

• Fig. 1 is a plan view of the safety hook, and
• Fig. 2 is a side view of the hook shown in Fig. 1.

In Fig. 1, a hook 1 is shown from a correspondingly bent bracket, which is attached to a hook plate 2. The hook plate 2 can be connected to the trapeze in the usual way via fastening belts, not shown, which are passed through the elongated holes 4. The hook or suspension bracket 1 engages over the trapeze rope 3.

Fig. 2 shows a side view, from which in particular the distances a and c can be clearly seen. In the embodiment shown, the hook consists of a curved profile piece with a round diameter, which is connected in a suitable manner to the hook plate 2, for example welded to it or is screwed or a continuation of the same is poured into the hook plate.

However, the hook 1 can be designed instead of a bracket in the form of a continuous tab, which forms an integral unit with the hook plate 2 or is connected to it in a suitable manner.

As materials for the hook 1, also in the embodiment as a tab, and the hook plate 2, plastics and metals, in particular stainless steel, and combinations of these materials are preferred.

According to a further embodiment, the suspension bracket 1 can be arranged rotatably with respect to the hook plate 2. This can be accomplished in that the suspension bracket forms a self-contained profile piece which is connected to the hook plate, for example, via a rotatably mounted bolt.

Alternatively, in one of the embodiments described in detail, the hook can be fastened on a part rotatably mounted relative to the holding plate 2.

The safety hook according to the invention has been described above together with a conventional hook plate. It goes without saying, however, that the invention directed to the geometry of the hook is also described without it bene hook plate can be realized. In other words, it is of no importance to the invention how the connection between the athlete and the safety hook is accomplished. The term "hook plate" is therefore to be understood in its most general form in connection with the present invention.

Likewise, the safety hook according to the invention has been described essentially with regard to trapezoidal ropes that are common today. It is also understood here that the term "trapezoidal rope" is to be understood in a general form and also includes similar devices.

Claims (10)

1. Safety hook for trapezoidal belts, especially for windsurfers, which consists of a hanging bracket (1) attached to a hook plate (2) which receives the trapezoidal rope (3), characterized in that the hanging bracket (1) has a wide support area (b) for the trapezoidal rope (3). 2. Safety hook according to claim 1, characterized in that the support area (b) is more than 10 mm. 3. Safety hook according to claim 1 or 2, characterized in that the support area (b) is 20 to 70 mm, preferably 30 to 50 mm. 4. Safety hook according to one of claims 1 to 3, characterized in that the support area (b) is wider than the projection of the length (a) of the hook tongue (5) on the hook plate (2). 5. Safety hook according to one of claims 1 to 4, characterized in that the support area (b) has 1.2 to 2 times the length (a) of the hook tongue (5). 6. Safety hook according to one of claims 1 to 5, characterized in that the front end (6) of the hook (1) is arranged at a distance (c) of 0.5 to 5 cm from the hook plate (2). 7. Safety hook according to one of claims 1 to 6, characterized in that the hook tongue (5) is inclined at an angle to the hook plate (2). 8 _. Safety hook according to one of claims 1 to 7, characterized in that the suspension bracket (1) is projected onto the plane the hook plate (2) has a tapering, preferably continuously tapering profile in the direction of its front end (6). 9. Safety hook according to claim 8, characterized in that the suspension bracket (1) has a tapered profile at an angle of 20 to 40 °, preferably 30 °. 10. Safety hook according to one of claims 1 to 9, characterized in that the suspension bracket (1) relative to the hook plate (2) is rotatably arranged.

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