CZ20107A3 - Structure of mobile goal for ball games - Google Patents

Abstract

The construction of a mobile sports goal includes two vertical bars (3), a horizontal bar (1) connecting the upper ends of said vertical bars (3), forming joints of each of the lateral ends of the horizontal bar (1) and each of the upper ends of said vertical bars (3) forming the upper corners (A) and the horizontal rear lower bar (2) disposed behind a vertical plane formed by said vertical rods (3) and said horizontal bar (1) in a horizontal plane extending through the lower ends of the vertical rods (3); (2) runs along a straight line parallel to the straight line intersected by the lower ends of said vertical rods (3). The mobile sports goal structure still includes a side lower rod (4) extending from the lower ends of said vertical rods (3) beyond a vertical plane formed by said vertical rods (3) and said horizontal wood (1) and connecting the lower ends of said vertical rods (3) with the lateral ends of said horizontal rear lower rod (2), wherein the joints of each of the front ends of said side lower rods (4) and each of the lower ends of said vertical rods (3) form the front lower corners (B) and the joints of each of the rear ends thereof the lower side rods (4) and each of the lateral ends of said horizontal rear lower rod (2) forming rear lower corners (C). The ratio of the weight of the rear lower rod (2) to the rear lower corner (C) to the weight of said horizontal wood (1) and upper corner (A) is greater than or equal to 2.5: 1. Brevno (1) is made of a composite % containing 20 to 75 wt. a matrix of resin and 25 to 80 wt. % of reinforcement containing 10 to 40 wt. % carbon fiber and 60 to 90 wt. glass fiber. Svis

Description

Technical field

It is an object of the present invention to design a mobile sports goal with increased safety, by using it to reduce the risk of injury when operating sports games, especially football.

BACKGROUND OF THE INVENTION

Some sports games, especially football, are currently used with mobile gates made of steel or duralumin. The disadvantage of these gates is that it is necessary to use heavy weights or other anchoring systems to stabilize them according to the relevant standards, but this is inconvenient and often neglected when moving frequently, and as a result they often serious injury, often resulting in death, especially in children who hang on the goalpost, swing on it and otherwise impair its stability. There is therefore a need to develop a mobile sports goal construction with increased security.

International Publication No. WO 2008/152175 discloses a sports goal with reduced risk of injury to athletes and standard bounce properties. Its two side rods and crossbar comprise a rigid core of metal, wood or the like, surrounded by a spongy porous sheath based on EPDM (ethylene-propylene-diene monomer), which in turn is covered with an outer layer of polyethylene coated with a polyurethane coating.

International Publication No. WO 2007/096435 discloses a sports goal that prevents injuries that may be caused by the construction of the goal. This wicket comprises rods and crossbars which are made of a flexible material such as rubber, which may be filled with sand, gravel, liquids, iron filings or the like.

International Publication No. WO 2009/129257 discloses an anchor device and a method for anchoring a mobile gate.

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Document FR 2,610,205 relates to a mobile device used in a sports environment, made of tubular aluminum sections, which includes, inter alia, a wheel system, a ground mounting system in two places, and is provided with a carabiner system for fastening the net.

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SUMMARY OF THE INVENTION It is an object of the present invention to provide a mobile sports goal structure with increased security without the need for additional anchor systems. For the purposes of the invention, a goal with increased safety is understood to be a goal which, as far as possible, does not overturn or is difficult to overturn and, if overturned, hits with as little energy as possible.

This object is solved according to the present invention by the construction of a mobile sports goal, which comprises:

• two vertical bars;

A horizontal crossbar joining the upper ends of said vertical bars, wherein the joints of each of the lateral ends of the horizontal crossbar and each of the upper ends of said vertical bars form upper corners, a horizontal rear lower rod disposed behind a vertical plane formed by said vertical bars and said horizontal crossbar in horizontal a plane extending through the lower ends of the vertical bars, wherein the horizontal rear lower bar extends along a line parallel to the straight line of the lower ends of said vertical bars, and • side lower bars running away from the lower ends of said vertical bars beyond the vertical plane formed by said vertical bars and said horizontal bar; connecting the lower ends of said vertical bars to the side ends of said horizontal rear lower bar, wherein the joints of each of the front ends of said side lower bars and each of the lower wheels said vertical rods form the front lower corners and the joints of each of the rear ends of said side lower rods and each of the lateral ends of said horizontal rear lower rods form rear lower corners, characterized in that the weight ratio of said rear lower rod and rear lower corners to weight said horizontal crossbar and upper corners is greater than or equal to 2.5: 1, wherein the crossbar is made of a composite containing 20 75 wt. % resin matrix and 80 - 25 wt. % reinforcement containing 10 to 40 wt. % of carbon fiber and 90 to 60 wt. glass fiber, vertical bars are made of composite, which contains 20 -

% W / w% by weight% w / w; % resin matrix and 80 - 25 wt. % reinforcement containing 5 to 20 wt. % of carbon fiber and 95 to 80 wt. glass fiber, and the rear lower rod and the side lower rods are made of a composite containing 20-75 wt. % resin matrix and 80 25 wt. % reinforcement containing 100 wt. glass fiber.

Further advantageous embodiments are set forth in the dependent claims.

The goal structure of the invention is defined above using an open definition and may therefore include other components or bars, for example, to suspend and / or shut down the net and / or to facilitate the movement of the goal. Thus, in one preferred embodiment, the gate of the invention further comprises means for suspending and / or switching off the net, such as bars, hooks, carabiners, eyelets, ropes and the like, and the net may be permanently attached to the gate of the invention, e.g. Or processes using heat, such as melting and welding. In another embodiment, the gate of the invention may comprise means for facilitating the movement of the gate, such as wheels or anchors.

All terms used to define the fit and direction of the individual components of the goal structure according to the invention, such as "vertical", "horizontal", "parallel", also include corresponding deviations from these conditions, given, for example, by the technical possibilities of manufacture. All the features described for the individual parts (eg rods) of the goal structure according to the invention collectively apply independently to each of these parts individually, eg the horizontal crossbar and vertical rods may be circular in cross section and the rear lower rod and the side lower rods may be within the same. design on square cross section.

The term "rod", "crossbar" is preferably meant to be a straight rod, but the invention also encompasses any other possible rods, e.g., curved, that may be required by circumstances, such as sport rules. The horizontal crossbar and the vertical rods are usually, and preferably, straight, but the rear lower rod and the side lower rod may be in the form of differently curved rods, e.g. they may form an arch. The rods and crossbars may have any cross-section, eg circular, square, rectangular, oval, preferably square or circular on the cross-section, most preferably circular. The bars and beams (and corners) may be hollow, partially filled or fully filled, both from the material from which they are made and other material. The vertical bars and horizontal crossbar have standard ball bounce properties.

Similarly, the term "horn" is not only meant to mean a sharp, rectangular corner, but the invention also encompasses other possible corner shapes, e.g., in the form of an arc, which may be required by circumstances, such as sports rules.

The ratio of the weight of said rear lower rod to the weight of said horizontal crossbar is greater than or equal to 2.5: 1. Preferably, the ratio is 3: 1 to 7: 1, more preferably 3: 1 to 5: 1, most preferably 3.5: 1 to 4: 1. All ranges within the scope of the present invention are to be construed as expressing, individually, all values within these ranges. For example, the range of 3: 1 to 5: 1 explicitly includes, for example, ratios of 3.1: 1, 3.2: 1, 3.01: 1.3.11: 1, etc. For prior art goals, the ratio is 2: 1. 1 (for steel wicket) and 1: 2 to 2: 1 (for dural wicket). The above weight ratios are achieved by making the horizontal rear lower bar heavier than the horizontal crossbar and / or the rear lower corners heavier than the upper corners. The weight of the bars, crossbars and corners can be influenced, for example, by using materials of different density, by using the same material at different wall thicknesses, by using filler, or by adding (screwing, welding) loads to the rear lower corners and / or rear lower rod.

The vertical bars, side lower bars and front lower corners will also have some influence on the stability of the goal structure according to the invention, but their effect is lower and, compared to the ratio described above, for a typical length ratio of vertical bar and side lower bar is approximately 4: 1 to 1: 1 negligible.

The total weight of the mobile gate construction according to the present invention preferably does not exceed 100 kg, so as not to be too heavy to carry.

The composite material for the construction is a resin, e.g., epoxy resin, polyester resin, vinyl ester resin, or methyl methacrylate resin, fiber reinforced, e.g., e-glass, s-glass, carbon fiber, or aramid fiber, basalt fibers, dynema fibers or natural fibers.

Within the scope of the invention, the horizontal beam of the goal structure of the present invention is made of a composite comprising:

- 75 wt. epoxy resin matrix

- 25 wt. reinforcement containing

%, By weight, up to 40% by weight of < RTI ID = 0.0 > 4% < / RTI > % of carbon fiber, up to 60 wt. glass fiber

Within the scope of the invention, the vertical goalposts of the present invention are made of a composite comprising:

- 75 wt. epoxy resin matrix

- 25 wt. % reinforcement containing up to 20 wt. % of carbon fiber, up to 80 wt. glass fiber.

In accordance with the invention, the rear lower rods and the side lower rods of the goal structure of the present invention are made of a composite comprising:

- 75 wt. epoxy resin matrix

- 25 wt. reinforcement containing

100 wt. glass fiber.

It will be understood that the composite material for manufacturing the wicket according to the invention may contain, in addition to the above components, suitable additives, excipients and / or fillers, such as heat stabilizers, UV stabilizers, UV absorbers, antioxidants, pigments, dyes, etc.

The goal structure of the invention can be manufactured by any conventional method suitable for the type of material from which the goal is made, e.g., drawing, welding, injection molding, blow molding, knitting, wrapping, wrapping, and the like.

The goal construction according to the present invention can be used wherever a mobile sport goal is needed, for example in sports fields, be they sports clubs or public sports fields, school playgrounds and playgrounds. The gate according to the present invention can also be used as a fixed gate after suitable attachment to the ground.

The present invention will be explained in more detail below using the examples and the accompanying drawings, which are not intended to limit the scope of the present invention. Although the invention will be explained by way of example of a soccer goal, it is to be understood that the invention is not limited to a soccer goal, but also includes goals useful in other sports, e.g.

handball, hockey, lacrosse, etc., or modifications thereof, such as futsal, beach soccer, national handball, beach handball, hockeyball, in-line hockey, etc., where the specific dimensions of the respective goals are given by the requirements and rules of each sport, or universal goals intended for use on public sports grounds, school playgrounds and playgrounds. On the basis of the description of the invention and the requirements of a particular sport, the practitioner is able to realize a goal according to the invention for any sport as well as in "non-standard" dimensions suited to the chosen purpose (eg reduced for a playground or the like).

Giant. 1 is a top, front, and left side perspective view of one embodiment of the mobile gate structure of the present invention.

Giant. 2 schematically shows a side view of the goal structure in stable positions S1 and S2 and labile position L.

DETAILED DESCRIPTION OF THE INVENTION

Example 1 - construction of a mobile sports goal

One embodiment of the mobile sports goal construction of the present invention (see FIG.

1) includes:

• two vertical bars 3;

A horizontal crossbar 1 connecting the upper ends of said vertical bars 3, wherein the joints of each of the lateral ends of the horizontal crossbar 1 and each of the upper ends of said vertical bars form upper corners A;

A horizontal rear lower rod 2 disposed behind a vertical plane formed by said vertical rods 3 and said horizontal crossbar 1 in a horizontal plane running through the lower ends of the vertical rods 3, the horizontal rear lower rod 2 extending along a line parallel to the straight line intersected by the lower ends of said vertical rods 3;

Lateral lower bars 4 running from the lower ends of said vertical bars 3 beyond a vertical plane formed by said vertical bars 3 and said horizontal crossbar J and connecting the lower ends of said vertical bars 3 to the lateral ends of said horizontal rear

a lower bar 2, wherein the joints of each of the front ends of said side lower bars 4 and each of the lower ends of said vertical bars of the lower corner B and the joints of each of the rear ends of said side lower bars 4 and each of the lateral ends of said horizontal rear lower bars 2 form a rear lower corners C. The material of the individual parts corresponded to the composition according to claim 1,

Example 2 - construction of a mobile soccer goal

A mobile football goal was constructed with the following parameters:

height of vertical bars 3: 2 m length of horizontal crossbar 1 and rear bottom crossbar 2: 5 m length of side lower bars 4: 1,5 m crossbar weight k 7,5 kg upper corner weight A: 1,5 kg total weight crossbar 1_ + upper corners A = 10.5 kg vertical bar weight 3: 3 kg side lower bar weight 4: 2.25 kg front lower corner weight B: 1.5 kg rear lower rod weight 2: 7.5 kg rear lower corner weight C : 13.25 kg total weight rear bottom bar 2 + rear bottom corners C: 35 kg weight ratio of rear bottom bar 2 and rear lower corners C to the weight of said horizontal crossbar 1 and upper corners A: 3.33: 1 crossbar composition 1: 25 wt. % SCHELL epoxy resin matrix, 75 wt. % reinforcement containing 30 wt. % of carbon fiber (TORAY T700) and 70 wt. % of glass fiber (e-glass OWENS CORNING), composition of vertical bars 3: 25 wt. % SCHELL epoxy resin matrix, 75 wt. % reinforcement containing 10 wt. % carbon fiber (TORAY T700) and 90 wt. % of glass fiber (e-glass OWENS CORNING), composition of rear lower rod 2 and side lower rod 4: 25 wt. % SCHELL epoxy resin matrix, 75 wt. reinforcement containing 10 (5% by weight of glass fiber (e-glass OWENS CORNING))

Example 3

The construction of the gate according to Example 2 (Gate I - composite) was tested together with prior art gate (Gate II - steel, Gate III - dural) to determine their center of gravity (T) and other parameters resulting from the center of gravity location (see Fig. 2). The results are shown in the following tables:

Table 1

Position of the center of gravity Mass Diameter of crossbar Character of the crossbar xt yt m r (m) (m) (kg) (m) Goal I - composite -0.67 0.61 59 0,094 Round cross section Goal 11 - steel -0.56 0.96 78 0,049 Round cross section Goal III - aluminum -0.24 1.39 50 0,1-0,117 Oval cross-section

Table 2

Angular velocity on impact Absolute speed of the crossbar on impact Moment of inertia to heel omega in crossbar ip (rad.s-1) (m.s-1) (kg.m2) Goal I - composite 2.2 4,422 56.5 Goal II - Steel 1,835 3,68835 250.6 Goal III - aluminum 4.38 8.8038 59.9

It is clear from these tests that the goal according to the present invention has a center of gravity positioned most rearward (x-axis position) and lowest point (y-axis position).

From the test data, the rollover energy values (E S1-L) and the minimum kinetic energy at impact (E L-S2) were calculated, as shown in the following table:

Table 3

E Sl-L E L-S2 Goal I - composite 171 137

Goal II - Steel 116 422 Goal III - aluminum 10 574

From the results it can be seen that the goal according to the present invention is the most stable since the highest energy is required to flip it. Once the goal has been overturned, the kinetic energy of the goal according to the present invention is the lowest, again demonstrating the increased safety of the goal according to the present invention.

Example 4

An analysis of the security of the gates used according to the technical standard EN 748 and related aspects concerning the properties of individual materials (steel, dural, composite materials) was performed, in particular the analysis of the sports goal fall dynamics, and the following results were calculated:

Table 4 - Kinetic energy of falling goal, person 50 kg (holding)

m (kg) E _k (J) steel gate 60 1175 aluminum gate 45 1276 aluminum gate 30 1743 composite gate 45 807

Table 5 - Kinetic energy of falling goal, person 50 kg (released)

m (kg) E _k (J) steel gate 60 461 aluminum gate 45 559 aluminum gate 30 348 composite gate 45 124

Table 6 - Kinetic energy of falling goal, person 30 kg (holding)

m (kg) Efc (J) steel gate 60 498 aluminum gate 45 218 aluminum gate 30 851 composite gate 45 -

In both cases with a 50 kg person, it is clear that the kinetic energy is the lowest for composite wickets, demonstrating their increased safety. For a person of 30 kg, the composite wicket does not even swing and there is no danger of the wicket falling.

List of reference marks horizontal crossbar rear lower bar vertical bar side lower bar

And the top corner

B front lower corner

C rear bottom corner

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Claims (7)

Patent Claim 1. Construction of a mobile sports goal, comprising: • two vertical bars (3); A horizontal crossbar (1) connecting the upper ends of said vertical bars (3), wherein the joints of each of the lateral ends of the horizontal crossbar (1) and each of the upper ends of said vertical bars (3) form upper corners (A); (2), located behind a vertical plane formed by said vertical bars (3) and said horizontal crossbar (1) in a horizontal plane running through the lower ends of the vertical bars (3), the horizontal rear lower rod (2) running along a line parallel to the straight line ends of said vertical bars (3), and • side lower bars (4) running away from the lower ends of said vertical bars (3) beyond a vertical plane formed by said vertical bars (3) and said horizontal crossbar (1) and connecting the lower ends of said vertical bars rods (3) with lateral ends of said horizontal rear lower rod (2), the joints of each of the front ends of the rods (3); said side lower bars (4) and each of the lower ends of said vertical bars (3) form forward lower corners (B) and joints of each of the rear ends of said side lower bars (4) and each of the side ends of said horizontal rear lower bars (3). 2) form rear lower corners (C), characterized in that the ratio of the weight of said rear lower rod (2) and rear lower corners (C) to the weight of said horizontal crossbar (1) and the upper corners (A) is greater than or equal to 2.5: 1, wherein the crossbar (1) is made of a composite containing 20-75 wt. % resin matrix and 80-25 wt. % reinforcement containing 10 to 40 wt. % of carbon fiber and 90 to 60 wt. glass fiber, the vertical bars (3) are made of a composite containing 20-75 wt. % resin matrix and 80 - 25 wt. % reinforcement containing 5 to 20 wt. % of carbon fiber and 95 to 80 wt. and the rear lower rod (2) and the side lower rods (4) are made of a composite containing 20 75 wt. % resin matrix and 80 - 25 wt. % reinforcement containing 100 wt. glass fiber. Mobile sports goal construction according to claim 1, characterized in that the ratio of the weight of said rear lower rod (2) and rear lower corners (C) to the weight of said horizontal crossbar (1) and the upper corners (A) is 3 : 1 to 7: 1, more preferably 3: 1 to 5: 1. Mobile sports goal construction according to claim 1, characterized in that the ratio of the weight of said rear lower rod (2) and rear lower corners (C) to the weight of said horizontal crossbar (1) and the upper corners (A) is 3.5: 1 to 4: 1. The mobile sports goal structure according to any one of the preceding claims, further comprising means for suspending and switching off the net, such as bars, hooks, carabiners, eyelets, ropes and the like. A mobile sports goal structure according to any one of the preceding claims, further comprising means for facilitating the movement of the goal, such as wheels or anchors. A mobile sports goal structure according to any one of the preceding claims, characterized in that the crossbar (1) is made of a composite containing 25% by weight of the composition. % epoxy resin matrix and 75 wt. % reinforcement containing 30 wt. % of carbon fiber and 70 wt. glass fiber, vertical bars (3). are made of a composite containing 25 wt. % epoxy resin matrix and 75 wt. % reinforcement containing 10 wt. % of carbon fiber and 90 wt. and the rear lower rod (2) and the side lower rods (4) are made of a composite comprising 25 wt. % epoxy resin matrix and 75 wt. % reinforcement containing 100 wt. glass fiber. A mobile sports goal structure according to any one of the preceding claims, characterized in that it is intended for football.