DE3007832A1 - TENNIS TECHNOLOGY TRAINER - Google Patents

Description

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KUHNEN ^:: & WACKER

PATENT AGENCY OFFICE 3007832

Kl-USM-KL-D KH'KI Sl-NTA riVhS »WHORE THE KUROi ¹ LAN I ¹ AThNr OIHl L

Mr. patent attorneys

Kurt Krampf 1 ^R '" ^{A- KUHNEN} * - ^{im 1N (:}

"W. LUDERSCHMIDT **, dr .. pin., C hi: m

P.-A. WACKER *, DII'L.-INC .. DII'I.-VVlKTSCH. ING

8390 Passau 11 KR 0103 4 / st

Ni.nn: ci! Ir independent © Patent application

5 tennis technique trainers

The invention relates to a tennis technique trainer according to

yes the preamble of claim 1 according to patent ...

j-j (P £ 9 11 146).

5 5 From US-PS 39 48 517 a device for Schla-K known as a tennis ball with a racket surface,

p which essentially consists of a U-shaped frame part that

Ϊ serves as a hit area for the club face, and a

§ consists of a tennis ball suspended from a pendulum. That

\ 10 eye of this pendulum is between two spacers, on the outside of which arms are provided, which

2 limit the trajectory of the struck ball. Between

t see these arms there is a space provided through

that a properly struck ball can pass without colliding with these arms. A bad one However, the ball is intercepted by these arms. This device is therefore only used to hit the ball in the right plane or in the right direction, so that it is either to intercept the ball or to pass through ? 0 can come. A dosage of the impact strength or a braking and quick reset of the ball is included

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this device is not possible.

The US-PS 36 01 398 describes a tennis technique exercise device, in which a tennis ball is suspended from an axle via a pendulum. Rotates after hitting the ball this pendulum around the axis several times, as there is no possibility of braking or damping. So it must longer stroke times are expected before the stroke is repeated; In addition, the opportunity to practice is omitted of special blows.

From US-PS 41 05 203 a tennis trainer is known, which consists essentially of an L-shaped arm as a ball holder consists, which is rotatably mounted in the horizontal plane on a carrier and via a return element, for example springs, can be returned to the starting position. This device is exclusive suitable for practicing forehand and backhand strokes, during all strokes that have a horizontal plane cannot be practiced with this device. This eliminates the need for exercises of praise or Topspin or slice strokes, 'continue to be powerful graduated blows cannot be learned due to the lack of controllability of the restoring force of the arm.

From the FR-PS p? 3P 339 a device for learning the tennis technique is known, in which a perpendicular arm attached to a support frame is equipped with a ball. This ball moves at Impact downward along a vertical plane and becomes elastic after impact Limb moved back to the starting position at the lower apex. With this no longer generic Device can only hit fore and backhand strokes, but not complicated strokes from bottom to top or be practiced from top to bottom. There is also no gradation of the impact force through dosage the damping provided.

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The exercise device described in US-PS 40 89 5? 1 is similar in principle to the device according to FR-PS 22 32 339 "because here also a ball attached to a rod is hit down and is brought back via a spring. The same disadvantages mentioned above therefore apply to this device.

From FR-PS 15 63 013 a device for exercise the tennis game known, in which the tennis ball has a curved arm and a roller bearing on a Drägervorrichtung is attached. This roller bearing ensures that the arm can rotate freely, which is not slowed down or dampened by the way.

The US-PS 25 06 025 describes a device for ball games, including for tennis. at This device is a ball suspended from a pendulum on an arm, in which an energy storage Helical spring is arranged. When the ball is hit and the pendulum rotates around the arm, the coil spring is tensioned and stores the energy. This process counteracts the ball movement, so that after completion of this forward movement there is a backward movement of the pendulum hanging ball comes. This device dampens the movement of the ball and ultimately brakes it. Due to the lack of lateral guidance, however, the pendulum can break out to the side, so that here already result in considerable time delays in the resetting due to the wobbling movement of the pendulum. Farther the numerous forward and backward rotations delay the usability of this exercise device considerably, where the rest position of the pendulum due to missing

Locking elements is difficult to reach. 35

The invention is based on the object of a tennis technique trainer to create, with which all striking techniques while varying the angular arrangement of the pen

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dels to the base area, the simplest construction and easy assembly can be learned, with a high Exercise frequency should be achieved on this device.

This object is achieved according to the characterizing part of claim 1.

With the device according to the invention can all Striking techniques that are used in tennis can be learned on just one device. So can Lob, slice and topspin strokes can also be learned as well as simple forehand or backhand strokes. By the height adjustability of the device can be simulated arbitrary impact positions that of the Impact positions just above the ground extend to the impact or impact position .

Since the pendulum is attached to the spring member, that between two attachment rods firmly connected to the axle is arranged, the pendulum can take any angle to the support plane by turning the axis, i.e. the rigid pendulum can move from the vertically hanging one to the horizontal or vertical one, for example standing position can be transferred steplessly. Via a corresponding, changeable offset of the Pendulum ensures that the racket does not hit the pendulum when hitting the ball, so that all Orientations of the racket surface in relation to the ball are possible.

By choosing springs, for example rubber bands or coil springs, with different spring characteristics a certain bias of the pendulum can be generated, which the player has to overcome, he can choose from a soft to a very hard hit ball. Due to the height adjustability of the spring link over on the mounting rods

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notches attached, can also adjust the preload force according to the changing forces Leverage law varies "

This spring member not only holds the pendulum in a certain position and provides the preload this pendulum, but also restores the pendulum connected to the ball in its initial position, if the spring member contracts again, resulting in a high exercise frequency on the tennis technique trainer according to the invention results.

Wobbling movements that the pendulum executes during its rotation can be prevented by the arrangement of lateral guide disks can be prevented on the axis, so that hereby an optimal rotation of the pendulum is guaranteed. When the axle is separated between these side washers, one Axle part is mounted axially displaceably in the other, the braking effect of the tennis technique trainer according to the invention can still be improved, since the spring force generated by the pendulum rotation increases Via the fastening rods on the axle parts that can slide against each other and thus on the lateral guide disks is transmitted so that these side guide disks press against the pendulum or its bearing ring and thus slow it down. Such an arrangement has the further advantage that with appropriate Tension of the spring member the pendulum is clamped between the lateral guide disks and thus Here, too, there is a possibility of simulation between soft and hard hits.

The subclaims contain advantageous developments of the invention.

Further details, features and advantages of the invention emerge from the following description

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of exemplary embodiments based on the drawing.

It shows

1 schematically shows a side view of a tennis technique trainer according to the invention,

Pig. 2 shows a section along line I-I in FIG. 1 and

3 shows an enlarged detail of FIG. 1, partially in cross section.

The working method of the tennis technique trainer according to the invention is explained with reference to FIGS. 1-3. This tennis technique trainer has a pendulum 1 that the axis 3 is rotatably mounted. At the end of the pendulum 1 opposite the axis 3 is a ball 18 attached, which usually has the size of a tennis ball. The weight of this ball 18 and des Pendulum 1 should essentially correspond to the weight of a normal tennis ball, so that the player when Play feels like he's playing a real tennis ball. The pendulum 1 is over a bearing ring 1? suspended on the axis 1 in such a way that it can swing freely after the impact, provided that there is no braking he follows.

The axis 3 can be attached at its free end with a conventional fastening element, for example a screw clamp, which in turn is attached to a solid base. on the other hand the axle end can also be screwed directly to a wall with the help of a flange or via fastening links be connected to a frame. These fasteners should be such that the Axis can be arranged horizontally in a wide variety of angle settings.

According to the invention, the pendulum 1 is provided with a spring member

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connected in such a way that with a pendulum swing this spring link? is tensioned and acts on the pendulum 1 a restoring force. This spring link? is aligned essentially parallel to the axis 3 and is located at a certain distance from this axis 3. This distance is determined by the fact that the spring member? is attached between fastening rods 4, 4, which are inserted into the axis 1 at a certain distance from one another. The fastening rods 4, 4 'are either screwed or pressed into the axle or, in an expedient embodiment, they penetrate the axle 1, as shown in FIGS. is shown. According to this embodiment, a further spring member 10 can be provided above the axis, which should have essentially the same spring characteristics and pretension as the spring member 2 .

Under the connection of the pendulum 1 with the spring link?

Any arrangement is to be understood by means of which the pendulum 1 is held firmly in every starting position and returned there after it has swung out. It is understood to mean both the arrangement of the pendulum 1 between an endless rubber band 5 stretched over the fastening rods 4, 4 ', as can be seen in particular from FIG. 2 , and the direct fastening of the pendulum 1 to a helical spring 6, as shown in FIG. In the arrangement according to FIGS. 1 and 2 , the pendulum 1 is pressed against one half of the endless rubber band 5 when it swings out, which counteracts the movement of the pendulum 1 and returns it to the starting position between the two parts of the endless rubber band 5.

As a spring link? all springs can be used that can be tensioned in the longitudinal direction, whereby preferably one or more endless rubber bands 5 or spiral springs 6 come into question. In a special

len embodiment can several spring members? with different spring characteristics on top of each other, so that an oscillation of the pendulum 1 is practically prevented.

If the spring member 2 is a spiral spring 6, as in Fig. 3 is shown, this spiral spring 6 can have an eye 7 approximately in its middle, through that the pendulum 1 can be guided. If this spiral spring 7 is provided with a certain bias is intended to simulate a hard hit ball, this coil spring 6 has on both sides at their ends several eyes arranged one behind the other, into which the fastening rods 4 can be inserted.

This allows the spring force or preload of the spiral spring 6 to be varied and to prevent the pendulum 1 must be moved on axis 3. On the other hand, it is sufficient that only one end of the spiral spring 6 with these eyes 8 is equipped when it has a web in its center which slidably moves a hole in the pendulum interspersed, so that the pendulum 1 is also not on the axis 3 when the coil spring is tensioned 6 must be moved. If necessary, this spiral spring 6 can also consist of two springs, which over this web are connected to each other. On the other hand, the pendulum 1 can also be attached via a fastening element, in particular a ring with the spring link? connected, with this ring in the rest position of the pendulum 1 can be moved on the spring member.

The spring force and restoring force of the spring member 2 exerted on the swinging pendulum 1 is both through the spring characteristics and the preload of the spring member as well as the distance between the spring member?

to axis 3 * The shorter this distance, the lower the force exerted on the pendulum 1 according to the law of the lever. About the height adjustability on the mounting rods 4, 4 ¹ so the

130037/0325

Restoring force of the spring member 2 can be varied. For any height adjustment, several notches 9 are therefore provided on the fastening rods 4, 4 'in a special embodiment, via which the spring member 2 can be arranged in the desired height setting. Furthermore, lateral guide disks 11, 11 are provided on the axle 3, which ensure that the pendulum 1 executes a rotary movement in a certain plane after it has swung out. An uncontrolled movement of the pendulum 1, which could lead to a collision with the fastening rods 4, 4 ¹ , is excluded. In order to prevent excessive noise from metallic parts, for example the pendulum and the lateral guide disks 11, IT, disks 13, 13 'made of plastic are provided between the bearing ring 12 of the pendulum 1 and the lateral guide disks 11, 11. On the other hand, the bearing ring 12 can also be provided with a noise-inhibiting layer made of plastic.

If in general any swing of the pendulum 1 to the side is to be prevented, instead of the Discs 11, 11 'and 13, 13' are provided a roller bearing pressed onto the axis 3 on which the Bearing ring 12 is attached. In general, however, the disc design is too costly prefer.

In a particularly preferred embodiment, the axle 3 consists of two axle parts, the division between the two side guide disks 11, 11 · has been made so that the pendulum is removed and can be rotated 180 °. In this way, a player can prepare for the exercise device in the same position. and backhand strikes. The two axle parts are designed in such a way that one axle part slidably inserted into the other axle part in this way

can be that the in Fig. 1 and? arrangement shown is obtained. What is essential about the axis division is that the distance between the two side guide disks 11, 11 'can be changed so that these disks or the disks 13, 13 'under load, of whatever type, on the pendulum 1 or its bearing ring 1? create and exert a certain pressure on them. For example, by the bias of the spring member 2, thus by choosing a certain spring member with a certain spring characteristic or by tensioning it With the spring member in the rest position, a stationary pressure is exerted on the pendulum 1. This in dependence The pressure, which can be varied by the selected spring tension, creates the impression that the player is one of them Would hit the ball, which as a result of its flight speed with a certain impact pressure on its Bat bounces. This impact pressure can, as explained above, by the number of spring links? and adjust their preload or spring characteristics.

However, this arrangement has the further advantage that the restoring force of the spring member 2 increases steadily with the swinging of the pendulum, so that the pressure exerted on the pendulum via the movable axle parts or the disks 11, 11 'and 13, 13' also increases. Due to this increasing frictional pressure, the pendulum is braked very quickly and returned to the starting position by the tensioned spring member 2, so that the pendulum 1 does not get jammed.

The axle parts separated from one another can, as shown in FIG. 3, be pushed into one another, the end 15 of the axle tube inserted in one axle tube having an axially parallel elongated hole 14 ^{through which one of the fastening rods 4, 4 1} passes. Through this axially sliding elongated hole 14, the variability of the distance between the lateral guide disks 1 "1, 11 ·

130037/0325

ensured so that the above pressure exertion is maintained under load. In the outer axle tube is the fastening rod penetrating the elongated hole 14 is fixedly arranged, for example by screwing in or is prevented from slipping through a stop.

As a rule, the spring member 2 is fastened between the fastening rods 4, 4 'with a slight bias must be in order to prevent falling or slipping of this spring member. This bias means in the choice of the embodiment separated into two axle parts that a constant pressure on the pendulum 1 is exercised and the playing of balls that appear to be stationary, as made when serving, is made impossible

) 5 will. In a further embodiment, this pressure on the pendulum 1 can be counteracted by a spiral spring 16 inserted into one tubular part, which acts on the end 15 of the other axle part. This spiral spring is held in the tubular axle part by a pin and the pressure exerted on the end 15 can be changed by moving the pin in corresponding recesses in the axle part so that spring members 2 of different spring characteristics and / or pretension can be used.

The pendulum 1 is usually made of metal or a relatively rigid plastic and has a preferred Embodiment at the level of the attached ball 18 has a crank 19, a 90 ° crank being preferred is. It has been found to be useful that the pendulum is divided at the height of the offset so that the Ball 18, as shown in phantom in FIG. 2, can be pivoted through 180 °. This eliminates the need to disassemble of axis 1.

As a result of the rotatability of the axis 3, all complicated techniques can be practiced, as both one

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Inclination as well as an upright position of the pendulum is possible. When the pendulum on a tripod rod attached and thus adjustable in height, numerous practice strokes can be performed in a very small space in quick succession be carried out, as is necessary, for example, when teaching larger groups.

130 037/0325

Claims (1)

KUHNEN-Ä WACKER PATENT AGENCY OFFICE RI-PRHSTNTATIVES BtI-ORE TME EUROPEAN PATHNT OFFICE Mr. patent attorneys R.-A. KÜHNEN *, DIPL-ING. W. LUDERSCHMIDT **, DR .. DIP1 ..- CHHM. P.-A. WACKER *, DiPL-iNC dipi .. wiktsomng. Passau 11 KR 0103 4 / st Now independent © patent application Expectations Γ 1) Tennis Trainers, "rotatable Toggle j ^" ^ del suspended tennis ball around an axis "of the em to a rigid pen is ordered, vobei the pendulum set in Bevegung can be attenuated via attenuators, according to patent ... 5 (P 29 11 146) characterized in that the pendulum (1) with a substantially parallel to the axis of rotation, § but arranged at a variable distance from this ; Spring member (2) is connected between two, in the Axis (3) fastening rods inserted at a certain distance (4, 4 ') is attached. 2 # tennis technique trainer according to claim 1, characterized in that that as a spring member (2) one or more endless rubber bands (5) with possibly different Spring properties are used, these being stretched onto the fastening rods (4) in such a way that that the pendulum (1) is between the individual rubber band parts. 3. Tennis technique trainer according to claim 1, characterized in that that as a spring member (?) one or more spiral springs (6) with possibly different springs BUKO C..370 OBERURSEI. · 'OFFICE tWW FREISINN * ZWEIGBÜRO 83 «PASSAU LINDtNSTRASSE 10 SCHNtGCSTRASSE 3-5 I.UDWIGSTRASSE 2 Part. Ool71 5084 · »TEL. 081ΡΙ- & 20-Ί TEL. 0851 / J6616 TELEX 4 166343 rcjl d ΓΚΙ.ΕΧ 52e547 pjwj <1 _-: [ι iC; i <AMM iliHiSSh! 'AIVAMIK.' ¹ OSTSfKFCTK MHNi 2
which properties are used. 4. tennis technique trainer according to claim 3, characterized in that that the spiral springs (6) have an eye (7) in the middle, into which the pendulum (i) can be used. 5. tennis technique trainer according to claim 3 or 4, characterized characterized in that the spiral springs (6) have several eyes (8) arranged one behind the other at their ends have into which the fastening rods (4) can be inserted and through which the spring force can be adjusted is. 6. tennis technique trainer according to one of the preceding claims 1 to 5 # characterized in that the Pendulum (Ί) connected to the spring member (2) via a fastening element, in particular a ring stands. 7 · Tennis technique trainer according to one of the preceding Claims 1 to 6, characterized in that the spring member (2) by on the fastening rods (4) attached notches (9) can be attached at different heights. 8. Tennis technique trainer according to one of the preceding Claims 1 to 7 »characterized in that the fastening rods (4) penetrate the axis (3) and a mirror image on the other side likewise a spring member, preferably with the same spring characteristics and the same preload, can be attached. 9. Tennis technique trainer according to one of the preceding Claims 1 to 8, characterized in that lateral guide disks (.11, 11 ·) are firmly provided, between which the bearing ring (12) of the pendulum (1) is located. 130037/0325 10. Tennis technique trainer according to one of the preceding claims 1 to 9, characterized in that the Bearing ring (12) of the pendulum (1) sits firmly on a roller bearing. 11. Tennis technique trainer according to one of the preceding Claims 1 to 10, characterized in that between the lateral guide disks (11, 11 ·) and the bearing ring (12) washers (13, 13 ') preferably made of plastic are provided, and / or the bearing ring (12) is provided with a plastic coating. 12. Tennis technique trainer according to one of claims ι to 11, characterized in that the axis (3) consists of two axle parts, one of which is slidably mounted in the other and each of which has a lateral guide disc (11, 11 ¹ ), vobei at a deflection of the pendulum (1) over the increasing tension of the spring member (2) the pressure exerted on the bearing ring (12) of the pendulum (1) via the lateral guide disks (11, 11 ') and possibly the disks (13, 13') increases . 13. Tennis technique trainer according to claim 12, characterized in that that the other axle tube stuck in one axle tube has an axially parallel elongated hole (14), which from the fastening rod (4, 4 ') firmly connected to the outer axle tube in such a way is penetrated that the one axle tube is axially displaceable on the other axle tube. 14. Tennis technique trainer according to claim 12 or 13, characterized characterized, c'ass the end (15) of the inner axle part which is inserted into the one axle tube can be acted upon by a spiral spring (16) with pressure, which is penetrated by the axis (3) Pin (17) axially displaceable in the axis (3) 130037/0325 4 1 is arranged. 15 · Tennis technique trainer according to one of the preceding Claims 1 to 14, characterized in that the 5 pendulum (i) consists of metal or plastic and has an offset (19), preferably a 90-offset, at the level of the attached ball (18). 16. Tennis technique trainer according to one of the preceding 10 claims 1 to 15, characterized in that the lower part of the pendulum (1) can be pivoted through 180 °. 130037/0325