JPS6213642Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a tennis practice machine.

As we all know, tennis is played by two or four people facing each other on the court with a net between them, but in addition to this type of play, various equipment has been developed to allow individuals to practice hitting back at served balls. has been done.

The present invention also proposes such a device that can be used alone for tennis practice, and its configuration is such that a ball supply trough that stops the ball at its tip is installed obliquely in a downward-sloping state; A hammer is provided which hits the ball from below by a rotational action and whose rotational direction matches the ball supply direction of the supply trough, and is biased in the hitting direction, and the hammer has a rotary shaft attached to the hammer. A trigger arm is provided to share the trigger arm, and a rotary lever that pushes the trigger arm faces the trigger arm.
The rotary lever is characterized in that it is driven by a motor.

The present invention will be explained in detail below based on the illustrated embodiments. Fig. 1 shows the state in which the ball launching device 1 of the tennis practice machine according to the present invention is used, and this device is used with, for example, a net 2 leaning against the rear in a corner of a practice field having a certain area. It is something. Of course, when using this device, it is not always necessary to use it in combination with the Internet. Next, the structure of the ball striking device 1 will be explained. Reference numeral 10 is a machine housing that houses various parts of the device, and the tip of the supply trough 11 faces above the machine housing 10. For example, the supply trough 11 is formed by combining steel wires or steel pipes, and is installed obliquely so that the tip (on the side of the ball launcher 1) is lowered as a whole.
The upper end is connected to the lower part of the net 2. That is, the lower surface of the net 2 is configured in a funnel shape so as to collect the balls returned after serving balls hit by the practitioner, and the ball A is fed into the supply trough 11.
The purpose is to ensure that the waste is collected in a timely manner. However, if it is not combined with the net 2, the upper end of the supply trough 11 only needs to be connected to a bucket for stocking the balls A or the like. At the tip of the supply trough 11, a ball receiving part 12 for preventing the ball A from falling is formed in the shape of a frame having a U-shape in plan. Further, to explain the members inside the machine casing 10, as an example, a rotation shaft 1 is attached to the front inner surface of the machine casing 10 via a suitable bearing.
3 is rotatably supported on a shaft, and a hammer 14 is attached to this rotation shaft 13. This hammer includes, for example, an arm 14 having a flat plate shape.
A hammer body 14 having a constant mass at the tip of a
The hammer body 14b is configured to be able to enter the inside of the supply trough 11 from below to a certain extent. Note that reference numeral 16 is a stopper that prevents the hammer 14 from moving upward. Further, a trigger arm 17 is provided sharing the rotation shaft 13, and a biasing spring 18 is stretched between the trigger arm 17 and the machine casing 10 side in the middle, so that the hammer 14 is constantly attached to the trigger arm 17.
This biases the force upward.
Of course, this biasing spring 18 does not necessarily need to be provided on the trigger arm 17, and the point is that it is sufficient that the hammer 14 is biased upward. It is only necessary to provide an appropriate biasing member to the holder. Furthermore, a rotary lever 19 for pushing the trigger arm 17 downward faces the tip of the trigger arm 17, and the rotary lever 19 is attached to the output shaft of a geared motor 20. As can be understood from this configuration, the rotating lever 19 contacts the tip of the trigger arm 17 within a certain range of rotation angles, and when it is pushed in and the rotation progresses further, the pushing is instantly released. Therefore, it is possible to attach a roller 17a to the tip of the trigger arm 17 in order to facilitate such operation. The reference numeral 21 in FIG. 1 is a foot switch for operating this device, and when such a switch is provided, the practiceer will be able to serve the ball at the appropriate hitting position. It is something that can be received. Of course, this configuration may not be used, and after the switch is turned on, the served balls may be sequentially thrown for a certain period of time.

The present invention has been embodied as such a configuration, and its operating state is as follows. First of all, in the stage before starting to throw the serve ball,
The hammer 14 is located at the uppermost position,
At this time, the hammer body 14b is connected to the supply trough 11.
It remains halfway inside the tip. On the other hand, ball A is in the supply trough 11
The balls A are lined up in sequence on the top, and the ball A on the most advanced side waits while being held back by the hammer body 14b at a position slightly removed from the position where it is thrown. In such a state, geared motor 2 can be turned off by appropriate switching operation.
0 starts, the rotary lever 19 fixed to the output shaft starts rotating accordingly. In such a case, if the rotation angle of the rotation lever 19 is further increased from the position where it is facing upward, the tip of the rotation lever 19 will touch the roller 1 of the trigger arm 17.
7a, and as a result, the trigger arm 17 is pushed downward and further rotates. Along with this operation, the tip of the trigger arm 17 rotates downward against the biasing spring 18, and along with this, the rotation axis 1
3, the hammer body 14b side of the hammer 14 integrated at 3 is moved downward.
In such a case, the hammer body 14b is connected to the supply trough 1.
The ball A at the lowest position has moved downward from the ball A and has been prevented from moving toward the ball receiving portion 12 in the supply trough 11 by the hammer body 14b.
It rolls up to the ball receiving portion 12. Of course,
It goes without saying that the subsequent ball A is also sequentially shifted downward by that amount. As the rotary lever 19 further rotates, the trigger arm 17 is no longer pressed by the rotary lever 19.
At the moment of this release, the trigger arm 17 is instantaneously repelled upward by the action of the biasing spring 18. This movement is transmitted to the hammer 14 via the rotation shaft 13 which is the base end of the trigger arm 17, and the hammer 14 also returns upward at the same time as the trigger arm 17 returns instantaneously. Due to this movement of the hammer 14, the ball A located at the tip of the supply trough 11 is struck from below by the hammer body 14b and thrown diagonally forward. The practitioner then practices by hitting the thrown ball A back at an appropriate position. When the rotary lever 19 rotates continuously in this manner, the above-described operation is repeated again, and the ball A is successively thrown. As shown in FIG. 1, this device is combined with a net 2, so that the net collects practice balls and sequentially collects them in the supply trough 11. If so, it would be preferable since it would enable continuous practice.

The ball launching device of the present invention has the above-mentioned configuration and function, and has a relatively simple configuration that allows for continuous practice. In particular, in the case of the present invention, since the rotating direction of the hammer, which is directly responsible for the ball striking action, almost coincides with the ball feeding direction, the hammer body 14b always strikes the center of the ball.
A stable throwing action can be expected.

[Brief explanation of the drawing]

Fig. 1 is a side view of the drive section of this device, Fig. 2 is a plan view of the same as above, Fig. 3 is a perspective view of same as above, Fig. 4 is a perspective view of the ball supply section of this device, and Fig. 5 is a use of this device. It is a perspective view showing a state. 1...Ball launching device, 2...Machine housing, 11...
Supply trough, 13... Rotating shaft, 14... Hammer, 17... Trigger arm, 18... Biasing spring, 19... Rotating lever, 20... Geared motor.

Claims (1)

[Scope of utility model registration request] A ball supply trough that stops the ball at its tip is installed diagonally with the tip downward.Meanwhile, the ball at the tip of the supply trough is struck from below by a rotational motion, and the direction of rotation is set by the ball of the supply trough. A hammer aligned with the feeding direction is biased in the striking direction, and the hammer's rotating shaft is provided with a trigger arm that shares the hammer, and this trigger arm is provided with a rotating lever for pushing the hammer. A ball hitting device for a tennis training machine, characterized in that the rotary lever is driven by a motor.