RU2015710C1 - Table tennis racket - Google Patents

Abstract

FIELD: sports stock. SUBSTANCE: racket has a core with which intermediate layers and outer wood plates are connected by an adhesive composition. The outer wood plates are made from white spruce plates of radial cutting. The outer wood plates are preferably made from a resonance spruce. EFFECT: improved playing characteristics. 2 cl, 6 dwg

Description

 The invention relates to sports equipment, in particular to equipment for table tennis.

 A table tennis racket is known, the base of which has a layered structure with a central layer consisting of three times glued plywood and peripheral layers located on both sides of the central layer and consisting of three times glued plywood. Plywood consists of Finnish birch and beech.

 The disadvantage of such a racket is its small elasticity and, as a consequence, the small area of the same bounce of the ball. To increase the elasticity of the racket of this design, it is necessary to increase its thickness, which leads to an increase in the weight of the racket.

 Known racket for table tennis, containing a handle with a striking part, comprising a core and associated with the adhesive composition of the intermediate layers and the outer wooden plate. The intermediate layers may be made of wood or carbon fibers.

 Known rackets are made mainly from a tangential section of a tree, which is characterized by heterogeneity of the capillary-porous structure, which leads to an increase in the thickness and unevenness of the glue line and, as a result, to a decrease in the area of the same bounce of the ball and the “control” of the ball. The insufficient elasticity of the outer plates also reduces the area of the same bounce of the ball.

 The dependence of the relative deformation of the plates from the tangential section of the tree on the relative stress is indirect, respectively, and the dependence of the ball rebound speed on the impact force is indirect, which worsens the control parameter of the ball.

 The aim of the invention is to improve the playing properties of the racket by increasing the area of the same rebound and increasing the parameter "ball control".

 This goal is achieved by the fact that in a table tennis racket containing a handle with an impact part, comprising a core and associated intermediate layers and outer wood plates according to the invention, the outer wood plates are made of spruce radial section plates.

 It is advisable that the outer plates were made of resonant spruce.

 The implementation of the outer plates of the racket from the plates of the radial section of the spruce allows you to use the properties of this material. The radial section of the spruce is highly homogeneous and has a 2-3 times better capillary-porous structure than its tangential section, and 10 times better than that of hardwood, for example, mahogany or ash, which contributes to a thin and uniform adhesive joint and improves the quality of the racket by increasing the area of the same bounce and increasing the parameter "control" of the ball. Significant elasticity of the radial section of the spruce at its low density allows increasing the area of the same bounce of the racket without increasing the weight of the racket. The dependence of the relative deformation on the relative stress of the spruce is straightforward, which ensures that the racket has a linear dependence of the speed of the bounce of the ball on the force of impact and increases the control parameter of the ball. The high resonant properties of spruce contribute to an increase in the contact time of the ball with the racket and the speed of the ball rebound.

 The author did not find technical solutions with features similar to those that distinguish the proposed technical solution from the prototype, therefore, the proposed technical solution meets the criterion of "significant differences".

 In FIG. 1 shows a racket with wooden intermediate layers, side view; in FIG. 2 is the same, a top view showing all layers of a racket; in FIG. 3 - the same, node A in the context (enlarged); in FIG. 4 is a side view of a racket with intermediate layers of carbon fibers; in FIG. 5 is the same, a top view showing all layers of a racket; in FIG. 6 - the same, node A in the context (enlarged).

 The racket (see Fig. 1, 2, 3) contains a handle 1 and a shock part, the latter consisting of a core 2, intermediate wooden plates 3 and 4, and outer plates 5 and 6.

 The racket (see Fig. 4, 5, 6) contains a handle 1 and a shock part, the latter consisting of a core 2, intermediate layers 3, 4, 7, 8 of carbon fibers and outer plates 5 and 6.

 PRI me R 1. The shock part of the racket has a core 2, consisting of a 3 mm thick Abahi wood plate. Intermediate wooden layers 3 and 4 are made of 0.6 mm thick radial section plates of spruce. The outer wooden layers 5 and 6 are made of plates of a radial section of a resonant spruce 0.8 mm thick. Racket weight 92 g.

 Tennis players of the Leningrad national team conducted an expert assessment of the racquets of this design in comparison with the best foreign racquets, similar in design. Rackets of identical design and thicknesses were taken, differing only in the type of wood in the intermediate and outer layers. In the “allround” racket, all layers are made of Abahi. The offensiv racket contains the core from Abakha, the intermediate layers from pine, the outer layers from Abakha.

 The assessment showed the advantages of the proposed racket in terms of the area of the same rebound of the ball, the dependence of the speed of the rebound on the force of the impact and on the "control" of the ball.

 PRI me R 2. The striking part of the racket has a core 2, consisting of a 3 mm thick Abahi wood plate. The intermediate layers 3, 4, 7, 8 are made of carbon fibers with a thickness of 0.1 mm The outer wooden layers 5 and 6 are made of plates of a radial section of a resonant spruce 1.3 mm thick. Racket weight 95 g.

 An expert assessment of this racket with the best foreign racket "Klampar, Tamka 5000" of the identical design of the Japanese company "Butterfly" was carried out. In the Klampar racket, the wooden core is made of balsa with a thickness of 3 mm, the intermediate layers are made of carbon fiber with a thickness of 0.1 mm and the outer wooden layers are made of radial cut plates of Japanese cypress 1.3 mm thick. An expert assessment showed a clear advantage of the proposed racket in terms of the area of the same bounce of the ball, the dependence of the speed of the bounce of the ball on the force of the impact, "control" of the ball.

Claims (2)

 1. TABLE FOR TABLE TENNIS, containing a handle with a shock part, comprising a core and associated with it an adhesive composition of the intermediate layers and the outer wooden plate, characterized in that, in order to improve playing properties by increasing the area of the same rebound and increasing the parameter "Ball control" , the outer wooden plates are made of radial cut plates of spruce.  2. The racket according to claim 1, characterized in that the outer plates are made of resonant spruce.

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