DE2825777A1 - SPORTS EQUIPMENT, IN PARTICULAR BALL CLACKERS - Google Patents

Description

Patent attorney

rtiN. Menzelsiraße4Q A fl »

MOTLEY MANUFACTURING 2 Ü ö I fl J

AGENCIES PROPRIETARY LIMITED ^v

44 Pirie Street ■,

Adelaide State cf South Australia
Australia

Sports equipment, in particular rackets

The invention relates to a piece of sports equipment, in particular one Rackets and their manufacture.

G uLp or , hitherto, sticks such as cricket sticks, hockey sticks and sticks for baseball games or for soft balls have been made of wood.

It is known that the different types of wood produce different properties of such clubs, and that certain types of wood are preferably processed into clubs.

For example, cricket bats are made as a composite of different types of wood, the handle being a requires a certain type and quality of wood, while the actual striking part consists of other wood.

The bat itself is eventually wrapped around a To a large extent avoid splinters of the wood with hard impacts.

It was previously considered imperative, thugs manufactured in this way in order to achieve all the necessary properties a racket should have. The numerous disadvantages associated with this racket construction have therefore been identified accepted and viewed as inevitable for such clubs.

Some of these disadvantages are that not only certain types of wood but also certain pieces of the chosen

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Wood had to be selected and individually worked by hand in order to achieve the exact shape of these pieces, Each was then connected by gluing, whereby the glued connection does not always have the necessary strength.

The individual pieces of wood can in turn have very different properties, and therefore larger ones are required Experience and skill to ensure that a selected piece of wood has the same properties as a has another piece of wood; In any case, even with great practice, no club will be exactly the same as the other, even if two clubs were made by the same person at about the same time.

In addition, as a result of the often tough rules of the game, for example When playing cricket, considerable forces act on the individual parts of the racket, and the racket parts are therefore exposed to heavy loads that can also lead to fractures.

Although it is of considerable importance for a player that after getting used to a racket he should always focus on the same Can leave racket properties, every racket seems to have different properties, and this is seen as a particular difficulty for the players.

The discussion of all these points makes it clear that the clubs currently used present considerable difficulties which so far could not be eliminated. The invention is therefore based on the task of finding a manufacturing method, and those manufactured by this method To design the racket in such a way that the rackets can not only be produced in series with the same properties, but also that precisely those properties of the racket are achieved which the players consider desirable be considered; It should be noted that most

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External dimensions of a racket either by the rules of a particular game or by the handling of the Racket are set. Certain impact properties, flexibility and elasticity at certain points should with the rackets according to the invention in a particularly simple manner Way to be provided or reproducible.

With the method according to the invention, these and others Advantages can be achieved, as will be explained in detail.

It is known that many different plastic parts are made by Spraying or pouring can be made.

For the production of large parts such as clubs by injection molding or casting, however, a very large mold is required required, so that all attempts to produce a plastic racket required considerable expense have, however, without leading to a usable result so far.

After detailed considerations regarding the special shape of a racket and also a racket training, at the different properties can be achieved in the desired manner, as well as after investigating different ones Material properties, rackets could now be produced entirely by injection molding; these clubs have all the advantages the clubs manufactured according to the usual methods, they do not have the disadvantages at the same time, which have the earlier manufacturing processes; In addition, these clubs have additional significant advantages in comparison to those previously produced in a conventional manner Thugs.

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The invention consists essentially of one for ball games to manufacture certain plastic clubs using a suitable process.

One of the major difficulties in making such a club has been finding an acceptable one To achieve equilibrium of forces; it was important to note that plastic has a specific gravity that is very different from wood, and that the properties of the racket with regard to it the handling of the ball, especially when it hits the ball, must not be changed.

Accordingly, in one embodiment of the invention is produced by injection molding from plastic Racket - although not mandatory - provided that the racket has a handle and a striking part, which has a front face of customary dimensions, and on the rear side of which a recess is provided which however, it is designed so that a edge reaching back remains.

Further features of the invention emerge from the claims, the following description and the drawings. Show it:

Fig. 1 is a perspective view of the back of a hockey stick,

Fig. 2 is a perspective view of the front or the Hockey stick face,

Fig. Ί> a perspective view of the striking end of the racket,

FIG. H shows a section along the line K - K in FIG. 1.

In Figs. 1 to 4, a hockey baton 1 is shown, which has a handle part 2 and a striking part J> , which

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intended to hit the ball. The striking part J has a flat striking surface 4, which partially extends along the stick part in the direction atf the handle part 2, The section 5 between the handle part 2 and the curved striking part 3 is along its rear side with a longitudinal recess 6 provided, which is increasingly deepened from its two ends in the direction of its center, the Section with the greatest depth extends over the greatest length of the recess.

As a result of this recess 6, the back of the stick has a pair of longitudinal ribs 7, so that part of the striking part and the section 5 on a lower, larger section has a longitudinal center piece of smaller thickness and edge parts 7 of greater thickness, these edge parts forming longitudinal ribs 7.

The face 4 is flat, and the roughly hook-shaped curved end of the club, which forms the face, has on its back the recess 6, which extends into the curved end. At the far end is the back slightly beveled so that this end piece 8 has a reduced thickness.

This formation of the racket with an inner center piece of smaller thickness and edges of greater thickness ensures when using plastic such as polypropylene or the like. Impact and impact properties compared to wooden clubs are much cheaper and double their properties. Even so, neither are the appearance of the racket and its basic shape, the total weight and the vibration properties are significantly different from those of Wooden clubs.

In addition, the properties of the racket can be changed in a largely targeted manner in a simple manner and with little effort

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will; a modified form can be used for this, which is cheap to manufacture, and there can be different plastics considering their different ones Properties are used.

It has been found that polypropylene is one for this application is an ideal material, while many other plastics are less suitable.

The depth of the recess provided in the racket can be determined in a simple manner in that the injection or Casting mold in this area is provided with a replaceable insert, so that the thickness of the insert has the properties of the racket.

This process is suitable for the production of clubs with the properties described; Racket, which for Hitting easier balls are intended, however, should have a low weight.

So it is z. B. especially recommended for young players who want to learn the game, initially no hard and heavy ball to use; clubs should also be a little lighter for young players than for adults.

According to the invention, the desired weight and the weight balance of a racket can be achieved without difficulty determine. The impact part has the desired weight and the point of impact or the center of impact is in the head or in the Impact part provided. As mentioned, the weight balance and the handling properties can be achieved by the insert can be determined which one is placed in the mold and determines the longitudinal recess.

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The racket according to the invention is thus in a simple VJeise
manufacture by injection molding or casting from plastic and
has the desired properties, which can be reproduced with little or no deviations.

The arrangement of the recess on the back in the area of the lower end of the club enables compliance with the correct Values of the weight balance or the weight distribution and the dimensional stability of the racket.

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Claims (6)

Patent attorney OOOC7T7 ZOZO / / / ZSiuitg art N- Menzelstrasse 4Q MOTIEY MANUFACTURING "Elfi 1 R 1 AGENCIES PRO.PRIETARY LIMITED ir »U U IUI Pirle Street 4 <$ Jypi -1Q79 Adelaide State cf South Australia ^{Ö £} ^ ~ ^{lJ / u} Australia Sports equipment, in particular ball rackets Patent claims Ball racket, consisting of a handle part and a striking part, characterized in that the racket as Unit is made of plastic by injection molding or molding. 2. Ball racket according to claim 1, characterized in that on the opposite side of the striking surface Impact a recess is provided by the longitudinal ribs is limited, polygons extend on either side of the recess. 3.Ball stick for use as a hockey baton, with a handle part, a lower stick part and a striking part, characterized in that the hockey baton is made from polypropylene by injection molding or casting is and dine extending in its longitudinal direction recess has, which extends into the lower floor part. 4. racket according to claim j5, characterized in that the recess extends partly into the rear side of the striking part opposite the striking face and is bounded on both sides by a longitudinal rib. 5. A method for producing a ball stick which is designed as a hockey stick stick, characterized in that, that 'the baton is made of polypropylene in a mold 809882 / 072S - 2 - ORIGINAL INSPECTED is, wherein an insert piece is inserted into the mold, which has a longitudinal recess in the area of the lower Section of the stick part and at least partially determined on the side opposite the face. 6. The method according to claim 5 *, characterized in that the insert is positioned in the form such that the desired recess and thus the desired properties of the hockey sticks can be achieved. 809882/0725