RU2722491C1 - Base of racket for table tennis - Google Patents

Abstract

FIELD: sports.SUBSTANCE: invention relates to table tennis training devices. Technical result is achieved due to new elements and their new connections in the racket base, which reduced vibration of base edges when contacting the ball by increasing the edges rigidity to increase the base playing point.EFFECT: perfected device.4 cl, 3 dwg

Description

The invention relates to sports equipment, in particular to the base of a racket for playing table tennis, contributing to the physical development and coordination of human movements.

Known racket for table tennis, the base of which contains a handle with a striking part, including the core and the intermediate and outer layers of wood associated with it with adhesive composition, characterized in that in order to improve playing properties by increasing the area of uniform rebound and increasing the control parameter of the ball, the outer layers of the tree are made of radial cut of spruce, including resonant spruce [1]. 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 uniform rebound 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 in the spruce is straightforward, which ensures that the racket has a linear dependence of the ball bounce speed on the impact force 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 disadvantage of such a racket base is the insufficient area of uniform bounce (playing spot) of the ball, associated with vibration of the edges of the base when in contact with the ball due to insufficient stiffness of the edges, especially when playing with a new plastic ball 40+.

The aim of the invention is to increase located in the center of the base of the playing spot by increasing the rigidity of the edges of the base.

It is known that a slight increase in the playing spot of the base is achieved by applying a layer of carbon (carbon), light carbon (soft carbon), arylite (Arylate), arylite-carbon (Arylate-Carbon) under the first (outer) or second layers or around the central layer of the tree. acrylic carbon (AC carbon), hybrid carbon (carbon CFL), fiber, fiber carbon fiber, fiberglass (Fiberglass), zylon (Zylon), zylon carbon (Zylon-Carbon), zylon fiber (ZLF), Kevlar (Kevlar, Carbokev ), Texalium and other hard or soft layers of plastic in the form of fibers or a mesh of one or more materials, which with their rigidity can reduce edge vibrations and increase the playing spot of the base. For example, Carbon gives the base speed and a wide playing surface and acts as a reinforcing layer that will strengthen the racket. Arylate - excellent control and feeling, Arylate fiber layers can reduce vibrations and also increase the playing spot of the base. The layers of Arylate-Carbon fibers also allow you to increase speed and the playing spot, combined with increased control and absorption of harmful vibrations. Rackets containing plastic layers of one material or several are called composite and are most suitable for productive game with a ball 40+ from a new plastic material. The base may contain 3-9 layers of wood with or without plastic layers. The direction of the core fibers and the first, third layers of the tree is performed longitudinally along the length of the base, and of the second, fourth layers of the tree across the length of the base, and so on. It is known that the speed and rotation of the ball depends on the speed of the player’s hand with a racket, which is proportional to the weight of the racket, depending on the weight of the base, and the greatest at their minimum weight. The base of a racket with a working part length of 155-160 mm, a width of 150 mm, a thickness of 5-10 mm, and a handle length of 100 mm weighing 75-85 g is considered light.

It is known that the rigidity and strength of the horizontal layers of any structure from the effects of incoming loads increases, and the vibration and degree of destruction decreases to the extent that the layers are closer to the vertical bonding layer. An example of this can be a channel of any material, the rigidity of the shelves of which is repeatedly increased by the rib connecting them. Similarly, the stiffness of the layers of the edges of the base of the racket will increase, and the vibration will accordingly decrease if all the layers of the base are connected by an edge made of wood.

The technical result of the invention is to improve the base of the racket to increase its playing spot.

The technical result is achieved due to new elements and their new connections at the base of the racket, namely: the base contains a working part 1, a handle 2, a core 3, external 4 connected with it by an adhesive compound, 5 intermediate layers of wood. The direction of the fibers of the core 3 and the outer layers 4 are performed longitudinally along the length of the base, and the intermediate layers 5 are transverse to the length of the base, and thus alternate with an increase in the number of layers of the tree. With a three-layer and five-layer base, the direction of the fibers of the outer layers and the core of the tree are performed longitudinally along the length of the base. Moreover, the base may contain 3-9 layers of wood, including containing under the first (outer) or second layers of wood or around the central layer of wood layers of plastic carbon (carbon), light carbon (soft carbon), arylite (Arylate), arylite-carbon) Arylate-Carbon, acrylic carbon (AC carbon), hybridcarbon (carbon CFL), fiber, fiber carbon, fiberglass (Fiberglass), zeylon (Zylon), zeylon-carbon (Zylon-Carbon), zeylon-fiber (ZLF ), Kevlar (Kevlar, Carbokev), Texalium or other hard or soft layers of plastic in the form of fibers or a mesh of one or more materials, and the base contains a strip 7 of a radial cut of a tree 0.8-3.0 mm thick vertically located to the layers of the tree , a length equal to the length of the playing spot on both sides of the base, and a width along the thickness of the base with a density equal to or greater than the density of the upper layer of the base, which is glued to the end of the base to all layers of the base from the end of the shock part opposite to the handle of the game spot by increasing stiffness and the associated decrease in vibration of the edges of the base in contact with the ball. In this case, the strip of wood can be located under the outer layers of the tree and the layers of plastic, and can be less or more than the length of the playing spot to achieve the desired increase in the rigidity of the edges of the base, and can reach the beginning or end of the handle of the base to increase the rigidity of the edges of the entire base and the base .

In FIG. 1 shows a side view of the base of the racket with the working part 1 and handle 2. In FIG. 2 shows a section A of the base with a glued strip 7 of the tree to its end to all layers of the base. In FIG. 3 shows a section of the base with a glued strip of wood 7 to its end to all layers of the base, and the glued strip of wood is under the outer layers of wood 4 and layers 6 of plastic.

Sources of information

1. Patent RU No. 20155710 C1, IPC A63B 59/04. Rackets for table tennis. Ermakov V.I. - Application No. 4785629/12. Claim 01/23/1990, publ. 07/15/1994.

Claims (4)

1. The base of the racket, containing the striking part, the handle, the core and the intermediate and outer layers of the wood associated with it with an adhesive, the base contains 3–9 layers of wood, including layers under the first (outer) or second layers of the wood plastic - carbon (carbon), light carbon (soft carbon), arylite (Arylate), arylite carbon (Arylate-Carbon), acrylic carbon (AC carbon), hybrid carbon (carbon CFL), fiber carbon, fiberglass (Fiberglass), fiber, zeylon (Zylon), zeylon-carbon (Zylon-Carbon), zeylon-fiber (ZLF), Kevlar (Kevlar, Carbokev), Texalium, characterized in that the base contains a strip of 0 radially cut tree thickness 0 , 8 ÷ 3.0 mm, with a length equal to the length of the playing spot on both sides of the base, and a width across the thickness of the base with a density greater than the density of the upper layer of the base, which is glued to the end of the base to all layers from the opposite end handle of the impact part to increase playing spots of the base by increasing stiffness and the associated reduction in vibration of the edges of the base in contact with the ball. 2. The base of the racket under item 1, characterized in that the strip of wood is located under the outer layers of the tree and layers of plastic. 3. The base of the racket according to claim 1 or 2, characterized in that the strip of wood reaches the beginning of the handle to achieve an increase in the rigidity of the edges of the base. 4. The base of the racket according to claim 1 or 2, characterized in that the strip of wood reaches the end of the handle of the base to increase the rigidity of the edges of the base and the base itself.

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