DE29917515U1 - table tennis racket - Google Patents

Description

Description

The invention relates to a table tennis bat with several layers, namely at least one middle layer and at least two outer layers.

Table tennis bats consist of several layers, namely several layers of wood glued together and rubber-like playing surfaces applied to both sides. The weight of the known bats is relatively high. The impulse generated when the ball hits the bat is also dampened by the multi-layered glued structure. This has a negative effect on the player's sensation of ball contact.

BREMEN OSNABRÜCK MUNICH GERMANY NUREMBERG .ALICANTE Hollerallee 73 Rolandsmauer 9 Widenmayerstrasse 48 Business Park/Keplerstrasse 10-12 Karolinenstrasse 27 P. Expl. de Espana 3.5° Dcha. &Ggr;)-">&Bgr;"»&Ggr;)&Ogr; Rrrnvn D-4W74 Osnabruck D-80538 Munich D-07549 Gera D-90402 Number E-O30O2 Alicante/Spain

•♦ ·

The object of the present invention is to create a table tennis bat which can be lighter than conventional bats and/or which gives the player a better feeling for ball contact.

To achieve the object, the table tennis bat according to the invention is characterized in that at least the middle layer has several layers, and that the middle layer at least in the area of outer layers and/or a

&iacgr;&ogr; middle layer is interrupted or broken up by dividing lines. The intended dividing lines divide at least the outer layers of the middle layer into different areas. The impact of a ball creates resonances or vibration waves that travel along the

There must be dividing lines. Without dividing lines, uncontrolled scattering occurs.

The dividing lines are arranged in a targeted manner and run towards a racket handle or run roughly parallel to it.

This directs the vibration waves towards the player's hand. The player's thumb and index finger usually rest on the playing surface. The ball of the hand rests on the racket handle. The arrangement of the dividing lines makes it possible to direct the vibration waves precisely towards the contact points for the thumb and index finger and/or the ball of the hand.

Advantageously, the middle layer is made up of at least three layers, namely with at least one middle layer

and at least two outer layers, whereby the layers consist of wood and the grain direction of the middle layer runs approximately perpendicular to the grain direction of the outer layers. In particular, the grain of the middle layer runs in a vertical direction, i.e. parallel to the racket handle. This has a positive effect on the strength and handling of the racket.

The outer classes and the middle class are under-educated

interrupted or fragmented by dividing lines, whereby the

Dividing line for Trdsjr · With _: tAs:ctiictit"e*w8:*qk$eOu -d^n.-dividing lines of the

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outer layers (the middle layer). The layers of the middle layer are made of BaIsa wood veneers, in particular with layer thicknesses of 1.0 mm to 5 mm each.

A table tennis bat with several layers is particularly advantageous, namely at least one middle layer and at least two outer layers, the outer layers - at least one outer layer on each side of the middle layer - being made of hardwood or plywood, in particular of beech veneer.

&iacgr;&ogr; or from the so-called aircraft plywood. The outer layers mentioned can be multi-layered, in particular each consisting of three layers, preferably with layer thicknesses of 0.2 mm each. With three layers in each layer, there are a total of nine layers, which

All in all, they have a relatively low weight while still being very strong and able to withstand vibrations.

Neighboring layers, particularly within the individual layers and preferably also from layer to layer, are glued together using a contact adhesive that does not or only slightly penetrates the layers. The physical properties of the layers are therefore not or only slightly changed by the adhesive. The elasticity is retained.

Each racket has a peripheral edge as a transition from a forehand side to a backhand side. According to the invention, the peripheral edge is sealed, in particular with liquid or thermoplastic plastic, preferably containing polyethylene or polypropylene. The sealing enables the reflection of spreading vibration waves back towards the racket handle. The player's sensation of ball contact is thereby further improved.

According to the invention, the layers and/or plies continue into the area of a handle. Handle shells made of light wood, in particular balsa wood, are applied there, preferably glued on. The handle shells are sealed, in particular with liquid or thermoplastic synthetic material, preferably containing polyethylene or polypropylene.

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Again, the weight of the racket and the player's feel for the ball are positively influenced.

A playing surface made of rubber 5 or a rubber-like material is applied to the outer layers, which is also provided in areas where the thumb and index finger usually rest. It has been shown that this enables a particularly good feel for the ball.

&iacgr;&ogr; Preferably, a layer interrupted by dividing lines is divided by these dividing lines into several areas, namely a particularly rectangular central area and adjacent edge areas. An edge area near the handle extends partly in the area of a striking surface and partly in the

is the area of the handle. Preferably, an edge area remote from the handle extends opposite the handle and lateral edge areas extend on both sides of the edge area close to the handle.

At least the middle area has additional dividing lines that together form a pattern or grid through which an impulse generated by ball contact is directed towards the racket handle. There are also areas in which adjacent dividing lines are spaced a maximum of 1.2cm apart. This distance corresponds approximately to the diameter of the contact surface of the ball hitting the racket at high speed. The aforementioned maximum distance of 1.2cm ensures that the ball hits the racket at least in the area of a dividing line.

Preferably, the grid or pattern is made up of diagonal and intersecting dividing lines relative to the racket. However, a different arrangement of the dividing lines is also possible, for example, relative to the racket handle as a pattern of horizontal and vertical lines.

A peripheral area near the handle, which extends into the The racket handle is secured by at least one Dividing line in longitudinal direction. Preferably

a separation^i/i^e a.«^ .«elpj!»'.Mit.ttenJbQreißh:»>n iii _: e. _: separation 1 inie to

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Division of the edge area near the handle. This has a particularly positive effect on the transmission of vibration waves into the area of the player's thumb and index finger.

The central region preferably has at least one V-shaped dividing line, with a turning point or a tip pointing towards the racket handle. In particular, a pattern or grid of further dividing lines is provided in an area delimited by the V-shaped dividing line.

When manufacturing the table tennis bat, the layers of the middle layer are first glued together. Then at least one outer layer of the middle layer is provided with separating lines, in particular by punching, whereby a middle layer remains largely intact.

Further features of the invention can be taken from the description and the claims.

Embodiments of the invention are described below
of drawings. They show:

based

Fig. 1 a cross-section through a table tennis bat to show the different layers and

Layers, for simplicity without hatching and not entirely to scale,

Fig. 2 a table tennis bat in an edge view, namely a view of lateral areas of a

surrounding edge,

Fig. 3 the table tennis bat according to Fig. 2 in edge view, namely a view of upper areas of the peripheral edge,

Fig.4

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a table tennis bat in plan view without playing surface, i.e. with a view of a cover wood veneer as the outer layer,

Fig. 5 a top view of the table tennis bat without playing surface and outer layer, i.e. with a view of a middle layer of a middle layer,

Fig. 6 the table tennis bat according to Fig. 5, but with

View of an outer layer of the middle layer (the so-called forehand layer),

Fig. 7 is a representation analogous to Fig. 6, but with a view of the other outer layer of the inner layer, the

so-called backhand layer,

Fig. 8 a variation in the design of the outer layer of the middle layer (forehand or backhand layer),

Fig.9

up to 16 variations in the pattern of an outer layer

the middle position (especially forehand or

backhand layer).

A table tennis bat 10 has a section 11 (with hitting surface) intended for contact with a ball and a handle 12. In Fig. 2 it can be seen that the section 11 and the handle 12 merge into one another. The latter is additionally provided with handle shells 13, 14.

The table tennis bat 10 is made up of individual layers or plies that are glued together. The layer structure can be seen in Fig. 1. In the present example, five layers are provided, namely a middle layer 15, outer layers 16, 17 and playing surfaces 18, 19. The playing surfaces 18, 19 are not explained in more detail, usually consist of rubber-like material or materials and are not shown in Figs. 2 and 3.

With regard to the present invention of extraordinary The importance is the structure of the three layers 16, 15, 17. Each of the Layers consists of three layers. The middle layer has 15

three Sch johj>efi, .••.n^mj-i.ch.: «ejne*·· .Au$«8nseh _: icht 20, eine

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Middle layer 21 and another outer layer 22. Each layer consists of a balsa wood veneer with a layer thickness of 1.5mm to 3mm. With a total of three layers, the middle layer is at least 4.5mm thick. Other soft and light types of wood are possible. Even more layers can be provided.

The outer layers 16, 17 are also made of three layers, in this case made of beech wood veneer with a

&iacgr;&ogr; layer thickness of 0.2mm each, so that each outer layer has a thickness of 0.6mm. The individual layers of each outer layer 16, 17 are referred to as outer layer 23, middle layer 24 and inner layer 25, with the latter layer facing the middle layer. Here too, more than three

Layers are possible.

The individual layers are glued together, both within the layers and from layer to layer. A so-called contact adhesive is used as the adhesive. This does not penetrate into the individual layers, or only slightly at most. Rather, it remains on their surfaces. The elastic properties of the various wood layers are thus retained. The weight is also not significantly increased. Without taking the adhesive into account, the structure and total weight of four designs are shown below, in which 20, 22 dividing lines are provided in the area of the outer layers:

a) Three layers of BaI sa wood veneer with 1.5mm each and two layers of three-layer beech veneer (each layer 0.2mm),

results in a total thickness of 5.7mm of the three layers and a minimum weight of 55g,

particularly suitable as a defensive or
All-round racket.

b) Three layers of balsa wood veneer, each 2.0mm thick and two layers of three-layer beech veneer (each layer 0.2mm thick),

ergj'b.t:««ins,ge.s.afl]V'.7, 2imn-«:D^e»ke.; <$e* (jrei. _: layers and a

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Minimum weight of 58g,

Particularly suitable for use as an aluminum round bat.

c) Three layers of balsa wood veneer, each 2.5mm thick and two layers of three-layer beech veneer (each layer 0.2mm thick),

results in a total of 8.7mm thickness of the three layers and a

Minimum weight of 60g,

particularly suitable as an offensive bat.

d) Three layers of balsa wood veneer, each 3.0mm thick and two layers of three-layer beech veneer (each layer 0.2mm thick),

results in a total thickness of 10.2mm of the three layers and a minimum weight of 64g,

particularly suitable as an offensive bat.

Beech wood veneer is also known as aircraft plywood. It is important to use a relatively hard wood for the outer layers 16, 17 in contrast to a relatively light and soft wood for the middle layer 15.

A peripheral edge 26, visible in Figures 2 and 3, is sealed with a liquid plastic, in particular with a thermoplastic, for example based on polyethylene. A similar seal is provided for the handle shells 13, 14. Due to the described seal, the various layers 15, 16, 17 in Fig. 2 are only indicated with hatched border lines.

Fig. 4 shows a top view of the table tennis bat 10 according to Figures 2 and 3, namely a view of the outer layer 23 of the outer ply 16. The outer layer 23 made of beech wood veneer is not interrupted or divided. Preferably, the three layers 23, 24, 25 of each ply 16, 17 are arranged transversely to one another with respect to their grain directions. This is not shown in more detail.

Fig. 5 "z§i$t a top view of the middle layer 21. This 4ö is through...;...jre1 _# ati*i ₀ .zum . Schiä$er<jrj.ff .(Grvffstück 12)

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transverse or horizontal dividing lines 30, 31 divided into three areas, an upper area 32, a middle area 33 and a handle area 34, the two dividing lines 30, 31 running approximately parallel to one another and approximately perpendicular to the longitudinal direction of the handle 12. Preferably, the grain in the middle layer 21 runs transversely to the longitudinal direction of the handle area 34, i.e. parallel to the dividing lines 30, 31. The grain directions are indicated by arrows 35.

The division of the middle layer 21 into three areas is the result of the width of the prefabricated veneers. In fact, a design of the middle layer 21 without dividing lines is also advantageous.

Figures 6 and 7 show outer layer 20 and outer layer 22 of the middle layer 15. Separation lines for defining different areas can be seen, namely (with respect to the longitudinal direction of the handle 12) longitudinal dividing lines 36, 37, 38 and transverse dividing lines 39, 40. A central area 41, lateral areas 42, 43, a handle area 44 and a handle end area 45 can be seen. The dividing lines 36, 37 extend between the central area 41 and the lateral areas 42, 43 as secants to the

2s circumferential edge 26. The transverse dividing line 39 connects the longitudinal dividing lines 36, 37 just above the handle 12, so that the grip area 44 projects slightly into the part of the racket belonging to section 11. The grip area 44 is divided into longitudinal grip areas 46, 47 by the longitudinal dividing line 38 in a part adjoining the grip end area 45.

The wood used for the outer layer 20 has a grain direction that runs transversely to the grain direction of the middle layer 21. In Fig. 6, the grain direction is indicated by arrows 48 running in the longitudinal direction of the handle.

In Fig. 6 also shown are the approximate positions D, Z and Hb in front of the thumb, forefinger and handball when holding the

·

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Table tennis bat 10. The thumb and index finger are placed outside the handle 12, close to it. Since the outer layer 20 shown in Fig. 6 is the "forehand layer", the thumb in position D rests approximately diagonally to the left above the handle 12 on the table tennis bat, preferably on the playing surface (not shown). Position Hb is in the handle area 45.

&iacgr;&ogr; Fig. 7 shows the outer layer 22 opposite the outer layer 20, the so-called backhand layer of the middle layer 15. Here too, dividing lines are provided for dividing the outer layer 22. The dividing lines 49, 50, 51, 52, 53 have the same position as those shown in Fig. 6

is explained dividing lines 36, 37, 38, 39, 40. In addition, a dividing line 54 is provided in Fig. 7, transverse to the longitudinal dividing lines 59, 50 and delimits a central region 55 upwards near the peripheral edge 26. This forms an upper region 56 between the peripheral edge 26 and the central region 25 - opposite the handle 12. Further regions 57, 58, 59, 60, 61, 62 correspond to the regions 42 to 47 explained with reference to Fig. 6.

Analogous to Fig. 6, the position Z for the index finger is circled in Fig. 7 and marks approximately the support point for the same. This is opposite the support point D for the thumb shown in Fig. 6 (circled). If the table tennis bat 10 is rotated by 180° in the player's hand, the support points Z, D and Hb not circled in Figures 6 and 7 apply.

Just as in Fig. 6, the grain of the wood of the outer layer 22 according to Fig. 7 is longitudinally directed and thus runs transversely to the grain of the middle layer 21, see arrows 63 in Fig. 7.

The dividing lines 36 to 40 and 49 to 54 in the outer layers

20, 22 improve the playing characteristics of the

Table tennis camp .10,. This..^i Ii.. iosJi&soijdere, in connection

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with a middle class not broken by dividing lines 21.

When a table tennis ball hits the racket 10, the resulting impulse is transmitted in the racket and sensed by the player. The impulse is transmitted via vibration waves, which can be influenced by a specific arrangement of the dividing lines. The dividing lines also scatter the vibration waves less than

Î without dividing lines. The player's feeling for the impacting ball is thereby improved. Figures 8 to 16 show variations in the arrangement of dividing lines in the outer layers 20 or 22 and in particular related to a table tennis bat 10 with a length of 26 cm and a

is width of 15cm.

According to Fig. 8, instead of the dividing line 54 shown in Fig. 7, two mutually parallel dividing lines 64, 65 are provided, namely approximately 2.5 cm and 5 cm below a highest point 66 of the racket 10. Further dividing lines can be provided, in particular in the so-called middle area 67, if necessary also in edge areas 68, 69, in the handle area 70, in handle length areas 71, 72, in the upper area 73 and in other areas. In the illustration according to Fig. 8, a horizontal/vertical cutting pattern results.

When the impulses are transmitted, the dividing lines interact with the surrounding, sealed edge 26. The vibration waves are reflected by the edge and thus amplify the signals arriving in the area of positions D, Z and Hb. A special arrangement of the dividing lines is particularly useful for this purpose, namely with an orientation approximately in the direction of positions D ₁ Z and Hb for the thumb, index finger and ball of the hand. The longitudinal dividing lines promote the conduction of the vibration waves in the direction of the handle 12 and are designated in Figures 8 to 16 with the numbers 74 to 79. The dividing lines 74, 75 and 76 correspond to the dividing lines 49, 50, 52 in Figure 7. Only the dividing line 76 is extended up to the beginning of the middle

area §·?. :«v«erl*ng«rj>·. un<d ...§tpß«t ,j $ft· e;irve _#: transverse

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Dividing line 80, analogous to the dividing line 51 in Fig. 7, while an upper transverse dividing line 81 corresponds to the dividing line 54 in Fig. 7. The dividing lines 74, 75, 80, 81 define between them an approximately rectangular central region, analogous to the s central regions 55 and 67. In this central region, further dividing lines are arranged which promote the transmission of the vibration waves in the direction of the positions D, Z and Hb. These additional dividing lines can also exceed the central region.

According to Fig. 9, additional diagonal dividing lines are provided in the middle area. These are aligned in a V shape, with reversal points 82 each lying on the central, longitudinal dividing line 77. The diagonal

The dividing lines 83 are at an angle of approximately 90 to 110° to one another and are directed inwards and downwards from the lateral, longitudinal dividing lines 74, 75. A lowest turning point 84 - beyond the lower dividing line 80 - is almost in the area of the handle 12. The dividing line 76, which runs along the handle 12, adjoins the turning point 84 downwards.

A distance between the dividing lines - a so-called grid spacing - of a maximum of 1.2 cm is advantageous. This ensures that when the ball hits at least the middle area of the racket 10, one of the dividing lines is always hit. The transmission of the vibration waves is thus particularly effective. Seven diagonal and V-shaped dividing lines are shown in Fig. 9. In fact, there can be more or fewer. However, the grid spacing mentioned is advantageous. This also applies to all other embodiments.

Fig. 10 again shows diagonally directed dividing lines. These form a square standing on its tip made of double lines in the middle area of the outer layer 20 or 22. A central, continuous, longitudinal dividing line 77 as in Fig. 9 is not provided in Fig. 10, instead two short longitudinal dividing lines 77, 78 are provided, each for connecting adjacent. ;V«fö,r»Hi,i _i ge _# r...Jre _(> Hn.l4 _: niefl .85 _y ..86. .In addition, a

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roof-shaped dividing line 87 is provided which connects the upper V-shaped dividing line 86 with the lowest V-shaped dividing line 88, the reversal point 84 of which adjoins the dividing line 76 of the handle 12.

Similar to the representations in Figures 9 and 10, Figure 11 also shows V-shaped dividing lines 89 which converge towards one another, with two V-shaped dividing lines 89 also meeting at the reversal point 84. The upper of the two V-shaped dividing lines 89 is curved inwards like a hyperbola and ends at a distance from the upper transverse dividing line 81. Within the last-mentioned upper dividing line 89 there is an inverted V-shaped and at the same time hyperbolic dividing line 90, the reversal point 92 of which is only a short distance from the dividing line 81 and which, together with the dividing line 89, encloses an almost elliptical surface, with the longitudinal dividing line 77 and a central section of the lower transverse dividing line 80 forming a T-piece within this ellipse. The longitudinal dividing line 77 begins at the transverse dividing line 80 and ends approximately in the middle of the oval-shaped surface.

Fig. 12 shows a modification compared to Fig. 11. The point 84 is the reversal point of a V-shaped dividing line 93, which consists of two hyperbolic arms. The transverse dividing line 80 is interrupted between the hyperbolic arms. Above the dividing line 80, between the hyperbolic arms, there are three hyperbolic, inverted V-shaped dividing lines 94, of which the two lower ones end at the dividing line 93 and the upper one crosses the dividing line 93 and extends with both arms to the dividing line 80. An upper vertex 95 of the upper dividing line 94 is connected to the transverse dividing line 81 via the longitudinal dividing line 78.

A diagonal grid of dividing lines 96 is shown in Fig. 13. The diagonally arranged dividing lines 96 form a grid within the dividing lines 74, 75, 80, 81, which can extend laterally beyond the longitudinal dividing lines 74, 75, as well as in other _: «Bepe-icf]e<g »&bull;&bull;.In··/!a. ··!£ _: ^st.:de>F· highest point 95 of the

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Grid is connected to the transverse dividing line 81 via the longitudinal short dividing line 78. A special feature is in the opposite, lower area. There, a square, the size of which exceeds the otherwise intended grid size, is positioned centrally on the transverse dividing line 80, so that a dividing line triangle is formed above and below the dividing line 80. The (lower) tip of the lower triangle is again the connection point 84 with the longitudinal dividing line 76 known from Fig. 11. &iacgr;&ogr; The dividing lines of the lower triangle also run diagonally from the point 84 through the positions D and Z.

Fig. 14 shows a V-shaped dividing line 97, the lower tip of which is the known point 84 and the arms of which are approximately halfway

is the dividing lines 74, 75 end or abut there. Between the arms of the dividing line 97 there are three inverted V-shaped dividing lines 98, the top of which with its apex 92 comes to lie below the transverse dividing line 81. The longitudinal dividing line 77 extends from the transverse dividing line 80 to the tip 92 of the top inverted V-shaped dividing line 98.

Fig. 15 shows a grid of five horizontal dividing lines 99 and the two vertical dividing lines 79 between the dividing lines 74, 75, 80, 81. The latter are followed downwards by the arms of a V-shaped dividing line 100, the lower tip of which is also the known point 84.

Finally, Fig. 16 shows in the middle area of the Outer layers 20, 22 two elliptical dividing lines 101,

102, whereby the upper of the two ellipses covers the lower one by about half. Vertex 92 of the upper ellipse is connected to the transverse dividing line 81 via the short, longitudinal dividing line 78. A lower

Vertex 103 of the lower ellipse just touches the Dividing line 80. Below this vertex 103 connects

the dividing line 80 downwards forms a semi-ellipse 104, the lower vertex of which is the known point 84. At the same time, diagonally directed dividing lines are provided, namely dividing lines 105 from the"]longitudinal lines 106 to the"]longitudinal lines 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 14

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and inwardly directed, which asymptotically or tangentially connect to the lower region of the lower ellipse 102, as well as dividing lines 106, which also asymptotically or tangentially connect to the lower region of the upper ellipse 101, but which do not quite reach the dividing line 81 or dividing lines 74, 75.

When manufacturing the table tennis bat, it is preferable to firstly produce the layers 20, 21, 22 of the

&iacgr;&ogr; middle layer 15 are glued together. The various dividing lines are then punched into the outer layers 20, 22. The middle layer 21 should remain as intact as possible. The outer layers 16, 17 or their layers are then glued onto the middle layer 15. The

The contact adhesive used is moisture and stretch resistant.

The sealing of the surrounding edge 26 can be done with the material from which table tennis balls are made. The balls are dissolved in acetone - after being crushed if necessary. The surrounding edge 26 or the handle shell 13, 14 are sealed with the liquid by soaking the mentioned parts in the liquid or by applying the liquid by spraying, rolling or brushing.

In an embodiment not shown, there are also three layers in the middle layer. Only the middle layer has dividing lines, not the two outer layers. The middle layer is about twice as thick as each of the two outer layers, or possibly even thicker. The wood grain in the middle layer runs vertically, i.e. parallel to the racket handle. In contrast, the wood grain in the two outer layers runs perpendicular to the vertical direction. The cutting patterns for the dividing lines shown in the individual figures can also be provided here. The outer layers (also referred to as cover sheets) can also be designed in an analogous way, namely with two layers of three-layer beech veneer, each layer being 0.2 mm thick. The outer layers then have a total of

Strength of... _: i _v 2mn>. _# .*uf·*, ftie*; ^«ra^ui^esejt^t.; result

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following calculation examples for the above-mentioned embodiment not shown:

a) Middle layer 1.0/2.0/1.0mm plus outer layers 1.2mm s = 5.2mm total thickness and minimum weight 54 to 70g,

Defensive bat.

b) Middle layer 1.5/3.0/1.5mm plus outer layers 1.2mm = 7.2mm total thickness and minimum weight 58 to 74g,

&iacgr;&ogr; Offensive bat.

c) Middle layer 1.0/3.0/1.0mm plus outer layers 1.2mm = 6.2mm total thickness and minimum weight 57 to 73g, all-round bat.

d) Middle layer 1.0/2.5/1.0mm plus outer layers 1.2mm = 5.7mm total thickness and minimum weight 55 to 71g, Al 1 round/defensive bat.

e) Middle layer 1.0/4.0/1.0mm plus outer layers 1.2mm = 7.2mm total thickness and minimum weight 58 to 74g, offensive bat (-).

f) Middle layer 1.5/4.0/1.5mm plus outer layers 1.2mm = 8.2mm total thickness and minimum weight 60 to 76g,

Offensive striker.

g) Middle layer 2.0/4.0/2.0mm plus outer layers 1.2mm = 9.2mm total thickness and minimum weight 64 to 80g,

Offensive bat ( + ) .

h) Middle layer 1.0/5.0/1.0mm plus outer layers 1.2mm = 8.2mm total thickness and minimum weight 60 to 76g, offensive bat.

i) Middle layer 1.5/5.0/1.5mm plus outer layers 1.2mm = 9.2mm total thickness and minimum weight 64 to 80g, offensive bat ( + ).

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&bull; ? φφφ φφφ ··' φφ φφ

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j) Middle layer 2.0/5.0/2.0mm plus outer layers 1.2mm = 10.2mm total thickness and minimum weight 66 to 80g, offensive bat (+ top speed).

k) Middle layer 2.5/5.0/2.5mm plus outer layers 1.2mm = 11.2mm total thickness and minimum weight 68 to 84g, offensive bat (+ top speed).

The thermoplastically sealed bamboo wood shells in the area of the racket handle, which are preferably used, weigh around 1 to 2g each. The top-heavy nature of the racket can be compensated for by using heavier handles, particularly in conjunction with heavier playing surfaces. The aim is to shift the center of gravity to the racket hand. The racket or racket wood can be up to 16g heavier than the minimum weight. The weight saving through the layer structure according to the invention is still around 25% compared to conventional rackets.

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Applicant:

1. Achim Rendler Gerken Patt 12 49459 Lembruch

2. Doris Bock
Gerkenweg 55 49459 Lembruch

October 4, 1999/7421 RDL-Il-DE

List of references :

10 table tennis racket 35 Arrows 11 Section 36 parting line 12 Handle 37 parting line 13 Handle shell 38 parting line 14 Handle shell 39 parting line 15 Middle position 40 parting line 16 Outside location 41 middle area 17 Outside location 42 lateral area 18 Play be I ag 43 side area 19 Play at ag 44 Grip area 20 Outer layer 45 Handle end area 21 Middle class 46 Grip length range 22 Outer layer 47 Grip length range 23 Outer layer 48 Arrows 24 Middle class 49 parting line 25 Inner layer 50 parting line 26 all-round edge 51 parting line 30 Parting line 52 parting line 31 parting line 53 parting line 32 upper area 54 parting line 33 middle area 55 middle area 34 Grip area 56 upper area &bull; · ··&diams; φφφ*
ϕ · · ϕ · · φ φ φ · φ φ ϕ ϕ · ϕ ·
φ φ · φ φ ·

57 s e i 11 i rather area angular range rather area angular range inien (diagonal) inie (diagonal) inie φφφ «&phgr;&phgr;&phgr; φφ φφ «·
··· &phgr;&phgr;&phgr;&phgr;&phgr;&phgr; 58 be tii rather area angular range rather area angular range Turning point inie (diagonal) inie * ** &phiv;&phgr;&phgr;&phgr;&phgr;&phgr;&phgr; 59 Grip area Grip area Area Trennl inie (roof-shaped] Vertex &bull;·φ «&phgr;&phgr;&phgr;&phgr;&phgr;&phgr;&phgr; φ· φφ 60 Handle end area inie Handle1 inie (lengthwise) Trennl inie (diagonal) 61 Handle! inie Handle! inie (lengthwise) Trennl inie (diagonal) 62 Griffin the highest point upper inie (lengthwise) Trennl inie (diagonal) RDL11BL.DOC 63 Arrows middle area Separate! inie (lengthwise) Trennl Vertex 64 Trennl since! i Trennl inie (lengthwise) Trennl Trennl 65 Trennl s e i 11 i Trennl inie (lengthwise) Separate! 66 Trennl inie (cross) 67 Trennl inie (cross) 68 Trennl Turning points 69 Trennl Trennl 70 Trennl 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 92 93 94 95

96 dividing lines

97 Dividing line (diagonal)

98 dividing lines (diagonal)

99 dividing lines (horizontal)

100 dividing line

101 Dividing line (ellipse)

102 Dividing line (ellipse)

103 lower vertex

104 semi-ellipse

105 Dividing line (diagonal)

106 Dividing line (diagonal)

&bull; φ φ φ

φφφφφ

φφφφ

Claims (24)

1. Table tennis bat ( 10 ) with several layers, namely with a middle layer ( 15 ) and at least two outer layers ( 16 , 17 ) thereto, characterized in that at least the middle layer ( 15 ) has several layers ( 20 , 21 , 22 ), and that the middle layer ( 15 ) is interrupted or pieced together at least in the region of outer layers ( 20 , 22 ) and/or a middle layer ( 21 ) to form dividing lines (30, 31, 36 to 40, 49 to 54, etc.). 2. Table tennis racket according to claim 1, characterized in that the dividing lines run approximately towards a racket handle (grip piece 12 ) or approximately parallel to it. 3. Table tennis bat according to at least one of the preceding claims, characterized in that the middle layer ( 15 ) is made up of at least three layers ( 20 , 21 , 22 ), namely with at least one middle layer ( 21 ) and at least two outer layers ( 20 , 22 ) thereto, wherein the layers preferably consist of wood and the grain direction (arrows 35 ) of the middle layer ( 21 ) runs approximately transversely to the grain directions (arrows 48 , 63 ) of the outer layers ( 20 , 22 ), in particular with a grain direction of the middle layer in a vertical direction, ie parallel to the bat handle. 4. Table tennis racket according to claim 3, characterized in that the outer layers ( 20 , 22 ) and the middle layer ( 21 ) are interrupted or pieced together to form dividing lines, the dividing lines of the middle layer ( 21 ) running approximately transversely to the dividing lines of the outer layers ( 20 , 22 ). 5. Table tennis bat according to at least one of the preceding claims, characterized in that the layers ( 20 , 21 , 22 ) of the middle layer ( 15 ) are formed from balsa wood veneers, in particular with layer thicknesses of 1.0 mm to 5 mm each. 6. Table tennis bat with several layers, namely with at least one middle layer ( 15 ) and at least two outer layers ( 16 , 17 ) thereto, in particular according to at least one of the preceding claims, characterized in that the outer layers ( 16 , 17 ) - at least one outer layer on each side of the middle layer ( 15 ) - are made of hardwood or plywood, in particular of beechwood veneers. 7. Table tennis bat according to claim 6, characterized in that the said outer layers ( 16 , 17 ) are constructed in multiple layers, in particular each consisting of three layers ( 23 , 24 , 25 ), preferably with layer thicknesses of 0.2 mm each. 8. Table tennis bat according to at least one of the preceding claims, characterized in that adjacent layers ( 20 to 25 ), in particular within the individual layers ( 15 , 16 , 17 ) and preferably also from layer to layer, are glued to one another, namely with a contact adhesive which does not or only slightly penetrates into the layers. 9. Table tennis bat according to at least one of the preceding claims, characterized in that a peripheral edge ( 26 ) is sealed, in particular with liquid or thermoplastic plastic, preferably containing polyethylene or polypropylene. 10. Table tennis bat according to at least one of the preceding claims, characterized in that the layers ( 20 to 25 ) and/or plies ( 15 , 16 , 17 ) continue into the region of a handle ( 12 ) and that handle shells ( 13 , 14 ) made of light wood, in particular balsa wood, are applied, preferably glued, there. 11. Table tennis bat according to claim 10, characterized in that the handle shells ( 13 , 14 ) are sealed, in particular with liquid or thermoplastic plastic, preferably containing polyethylene or polypropylene. 12. Table tennis racket according to at least one of the preceding claims, characterized in that a playing surface ( 18 , 19 ), in particular made of rubber or rubber-like material, is applied to the outer layers ( 16 , 17 ) and that the playing surface is preferably also provided in areas (D, Z) on which the thumb or index finger of a player may rest. 13. Table tennis racket according to at least one of the preceding claims, characterized in that a layer ( 20 , 21 , 22 ) interrupted by dividing lines is divided by the dividing lines ( 49 , 50 , 51 , 54 ) into several regions, namely a particularly rectangular central region ( 55 ) and adjacent edge regions ( 56 , 57 , 58 , 59 ). 14. Table tennis racket according to claim 13, characterized in that an edge region ( 59 ) near the handle extends partly in the region of a hitting surface and partly in the region of the handle ( 12 ). 15. Table tennis racket according to claim 13 or 14, characterized in that an edge region ( 56 ) remote from the handle extends opposite the handle ( 12 ). 16. Table tennis racket according to claim 14 or 15, characterized in that lateral edge regions ( 57 , 58 ) extend on both sides of the edge region ( 59 ) near the handle and the central region ( 55 ). 17. Table tennis racket according to at least one of the preceding claims 13 to 16, characterized in that at least the central region ( 55 ) has additional dividing lines which together form a pattern or grid through which an impulse resulting from ball contact is guided in the direction of the racket handle (handle 12 ). 18. Table tennis racket according to at least one of the preceding claims 13 to 17, characterized in that regions are provided in which adjacent dividing lines have a maximum distance of 1.2 cm from one another. 19. Table tennis racket according to at least one of the preceding claims 13 to 18, characterized in that the dividing lines form a pattern of horizontal and vertical dividing lines ( 74 , 79 , 75 ; 80 , 81 , 99 ) relative to the racket handle (handle 12 ). 20. Table tennis racket according to at least one of the preceding claims 13 to 19, characterized in that the dividing lines form a pattern of diagonal dividing lines ( 96 , 98 ) relative to the racket handle (handle 12 ). 21. Table tennis racket according to at least one of the preceding claims 13 to 20, characterized in that an edge region ( 59 ) near the handle, which extends into the racket handle (handle 12 ), is divided in the longitudinal direction by at least one dividing line ( 52 ). 22. Table tennis racket according to claim 21, characterized in that dividing lines ( 83 , 88 , 89 , 93 , 97 , 100 , 104 ) from the central region open into the dividing line ( 76 ) for dividing the edge region ( 59 ) near the handle. 23. Table tennis racket according to at least one of the preceding claims 13 to 22, characterized in that the central region ( 55 ) has at least one V-shaped dividing line (83, 86, 88, 89 etc.) with a turning point ( 84 ) or a tip pointing in the direction of the racket handle (grip piece 12 ). 24. Table tennis racket according to claim 23, characterized in that a pattern or grid of further dividing lines is provided in an area delimited by the V-shaped dividing line.