JPH0423577Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is based on the idea that a tennis ball is attached to a string whose length can be easily adjusted, and by hitting the tennis ball with a racket, players can perform volleys, spins, drop shots, etc. This invention relates to tennis practice equipment that allows you to practice.

(Prior Art) Recently, the number of people playing tennis has been increasing, which is called a tennis boom, and along with this, tennis courts are being constructed in various places. However, the expansion of tennis courts has not kept up with the rapid increase in the number of tennis players, and as a result, tennis schools are overflowing with trainees, making it difficult to sufficiently practice strokes and the like.

Therefore, various tennis practice tools have been proposed that allow players to learn correct form, strokes, etc. without actually going out on the court.

This kind of tennis practice equipment has three attachment parts 702, 703, 70 attached to the upper and lower sides of a support frame 701 having a triangular front shape, as shown in FIG. 7, for example.
4, a slide rope 706 equipped with a ring body 705 is stretched over the lower attachment parts 703 and 704, and the remaining upper attachment part 702 and the ring body 70
5, both ends of a cord 708 inserted through a ball 707 were attached via attachment fittings 708a and 708b.

(Problem to be solved by the invention) However, in such a practice tool, both ends of the string inserted through the ball are supported by the upper and lower mounting parts of the support frame, so the racket surface is not aligned with the string. You can practice the ground stroke, which is a general ball-striking technique that can be learned by hitting the ball parallel to the ball, but it is also a more advanced ball-striking technique that can be learned by hitting the ball with the racket surface tilted relative to the string. There was a problem that made it difficult to practice certain volleys, spins (topspin and underspin), and drop shots. Furthermore, since the ball through which the string is inserted is fixed at a predetermined location on the string, there is a problem in that it is not possible to practice hitting the ball at an arbitrary height.

Therefore, the purpose of this invention is to be able to easily adjust the length of the string, and therefore the height of the ball, and to be able to easily adjust the height of the ball, as well as to achieve advanced ball hitting techniques such as volley and spin. To provide tennis practice equipment with which one can sufficiently practice drop shot.

(Means for Solving the Problems) This invention provides a tennis practice tool 1 in which a ball 4 is suspended from a string 3 attached to a support frame 2.
One end of the string 3 is inserted into the insertion hole 5 provided in the ball 4, and is locked and supported by a locking portion 7 provided in the insertion hole 5, and one end portion of the string 3 is stored in the ball 4, The other end of the string 3 was rotatably supported on a shaft 2b extending horizontally from the support frame 2.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is an overall external view of a tennis training device according to the present invention, and FIGS. 2 and 3 are a cross-sectional view and an enlarged view of a ball attached to a string according to the present invention.

Reference numeral 1 denotes a tennis practice tool, which consists of a support frame 2, a string 3 with one end attached to the top of the frame 2, and a ball 4 attached to the other end of the string 3. .

The support frame 2 is provided with a fixture 2a on its upper part. The fixture 2a is rotatably supported by a shaft 2b that projects horizontally from the upper end of the frame 2, and is attached to the upper part of the frame 2 via the shaft 2b.

As shown in FIGS. 2 and 3, the string body 3 consists of a stretchable rubber braid 3a and a woven fiber cord 3b that covers this, and one end of this string body 3 is connected to the fitting 2a. The cord 3 is fixed by screwing into a hole (not shown) drilled in one end, and the other end of the string 3 is inserted into an insertion hole and a locking part, which will be described later, to be locked and supported, and stored in the ball. .

As shown in FIG. 2, the ball 4 is made up of a core part 4a made of hollow spherical rubber, cloth-filled rubber 4b covering the outer peripheral surface of this core part 4a, and flocked hair 4c provided on the outer peripheral surface of this rubber 4b. Become. This ball 4 also has an insertion hole 5 on the top side on the center line through which the other end of the string 3 is inserted, and the other end of the string 3 is screwed into the core part 4a on the bottom side on the center line. A fitting groove 6 for fixing is provided, and a locking portion 7, which will be described later, is provided in the insertion hole 5.

Here, the aforementioned locking portion 7 will be explained with reference to FIGS. 2 and 3.

The locking part 7 is composed of a pair of left and right members 7a, 7a which are approximately wedge-shaped when viewed from the side, and the members 7a, 7a are attached to an adhesive part 7b, which is adhered to the inside of the insertion hole 5, respectively.
7b, and protrusions 7c, 7c extending inward from the adhesive portions 7b, 7b of the ball 4. These members 7a, 7a face each other to form the insertion hole 5.
It is located inside. Further, the projections 7c, 7c of the members 7a, 7a constituting the locking portion 7 lock and support the other end of the string 3 described above from both sides to prevent the other end from coming off. There is.

Next, the operation of the above embodiment will be explained.

First, by suspending the ball 4 from the upper part of the support frame 2 via the string 3 as shown in FIG. 1, it is possible to sufficiently practice ground strokes, low volleys, and top spins by hitting the ball four times. .

Next, as shown in FIG. 2, the length of the string 3 can be easily and arbitrarily adjusted by storing the end of the string 3 into the ball 4 through the insertion hole 5 of the ball 4. In this case, the height of the ball 4 can be easily adjusted (either shortened in the direction of arrow A in Figure 1 or lengthened in the opposite direction to arrow A), and the height of the ball 4 can be easily adjusted (a position above or below the position shown in Figure 1). ), so you can fully practice high volleys, underspin, and serves.

In addition, ball 4 is the basis for practicing the above-mentioned ball hitting technique.
You can also practice hitting the sweet spot.

Furthermore, in the tennis practice device 1 of the present invention, the attachment 2a of the support frame 2 is rotatably supported via the shaft 2b, and when the ball 4 is hit with a racket, the ball 4 and the attachment 2a are rotated. The string 3 that connects the frame 2
This prevents it from wrapping around the top edge of the

FIG. 4 shows a second embodiment of the present invention.
This second embodiment has members 7a and 7a which are locking parts 7.
A plurality of protrusions 7c, 7c are provided, and the operation and effect are the same as in the first embodiment.

5 and 6 show a third embodiment, in which the diameter of the insertion hole 5 in the first embodiment is made smaller than the diameter of the string 3, and the locking portion is The operation and effect are also the same as in the first embodiment. Further, in the third embodiment, a convex hole 601 having a diameter larger than the diameter of the string 3 is bored on the ground side of the ball 4 of the first embodiment, and one end of the string 3 is formed. A stopper 602 having a generally convex shape in side view is provided to which a stopper 602 is fixed, so that one end of the string 3 can be easily inserted and removed from below the ball 4.
The height can be adjusted very easily. The stopper 602 is configured so as not to protrude from the outer peripheral surface of the ball 4 when fitted into the hole 601.

This invention was proposed as a tennis practice tool, but
The present invention can be used not only as a tennis practice tool but also as a batting practice tool, for example.

(Effects of the invention) As is clear from the above explanation, according to the invention,
The length of the string can be easily adjusted, so the height of the ball can also be easily adjusted, and it is also possible to sufficiently practice advanced ball hitting techniques such as volley, spin, and drop shot. .

[Brief explanation of the drawing]

Fig. 1 is an overall external view of the tennis practice device according to the present invention, Figs. 2 and 3 are cross-sectional views and enlarged views of the ball attached to the string according to the present invention, and Fig. 4 is the main figure. FIG. 5 and FIG. 6 are views showing a third embodiment of the invention, and FIG. 7 is an overall external view of a general tennis training device. In the drawings, 1 is a tennis practice tool, 3 is a string, 4 is a ball, 5 is an insertion hole, and 7 is a locking portion.

Claims (1)

[Scope of Claim for Utility Model Registration] A tennis practice device in which a ball is suspended from a string attached to a support frame, wherein one end of the string is inserted into an insertion hole provided in the ball and a lock is provided in the insertion hole. One end of the string is housed in a ball, and the other end of the string is rotatably supported on a shaft projecting horizontally from the support frame. Tennis practice equipment.