JPS6116461B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ball throwing device for throwing a tennis ball or a baseball ball.

As a ball throwing device of this type, the applicant previously proposed a guide gutter whose bottom plate is curved downward and a supply port and a ball throwing port formed approximately tangentially to the bottom plate. The patent application has been filed for a ball throwing device that includes a rotating body whose outer periphery is spaced a predetermined distance from the bottom plate of the guide gutter. (Utility Model Application No. 56-150577) This device is small and has a simple structure, and can throw objects such as balls in a gentle parabolic shape, and has achieved its purpose, especially as a throwing device for tennis practice. We were able to.

However, in the prior application, the ball being fed into the guide trough was thrown by a single rotating body, so the ball was thrown while rotating exclusively in the forward direction, resulting in poor ball quality. As a result, it was rather monotonous and did not necessarily satisfy experienced users.

This invention was made in view of the above-mentioned circumstances, and it is possible to throw a ball with a small size and simple structure by throwing the ball being fed into the guide trough using two rotating bodies that can rotate at variable speeds. The objective is to provide a ball throwing device that has a rich variety of qualities and can be adapted to a wide range of demand groups.

The present invention will be described in detail below based on illustrated embodiments.

In the drawings, FIG. 1 is a front view of a ball throwing device according to the present invention, and FIG. 2 is a sectional view thereof.
A pair of pillars 2, 2 are bolted and fixed to a flat base 1, and a support shaft 3 is installed on the top of the pillars,
A locking plate 4 is installed at the bottom. A pair of swinging arms 5 are rotatably fitted into and supported by the upper ends of the support shaft 3, and a guide trough 8 is connected to the upper part of the swinging arms 5a via a backing plate 6 and a bracket 7 on the inner side. Integrally connect by bolting. Further, a second motor 10, which will be described later, is bolted and fixed to the lower part of the swing arm 5.

The guide gutter 8 has a flat semi-cylindrical shape, and has a bottom plate 8c installed on the lower edges of the left and right side plates 8a and 8b, and an upper plate 8d on the front of the upper edges of the left and right side plates 8a and 8b. It will be constructed and arranged. The bottom plate 8c has an intermediate portion curved downward about the extension axis of the support shaft 3, and its front and rear ends extend in the tangential direction. 8e is a supply port for the object A to be thrown, such as a tennis ball, and 8f is a throwing port. A first motor 9 supported by the base 1 via legs 11 is disposed on the left side of the guide gutter 8 . The axis of rotation of the first motor 9 is aligned with the extension axis of the support shaft 3, and the axis of rotation 9a thereof is projected into the guide trough 8 from the left side plate 8a. This rotating shaft 9a has a first
The first rotating body 12 is made of a soft friction material such as cloth, soft synthetic resin fabric, or sponge to the extent that it does not damage the ball being thrown object A,
Its outer peripheral surface is spaced apart from the bottom plate 8c of the guide trough 8 by a dimension slightly smaller than the diameter dimension of the ball being thrown object A.

Note that the center portion of the left side plate 8a of the guide gutter is fitted and supported by the boss 9b of the first motor 9 so that the left side can be moved.

The second motor 10 described above is the first motor 9
The second motor 1 is rotated in the opposite direction to
A second rotary body 13 is attached to the rotation shaft 10a of the rotary shaft 10a.

The second rotating body 13 is made of the same material as the first rotating body 12, and the upper part of its outer peripheral surface is connected to the guide trough 8 through the notch hole 8g bored in the front part of the bottom plate 8c.
It projects inward and is spaced apart from the outer peripheral surface of the first rotating body 12 by a dimension slightly smaller than the diameter dimension of the ball being thrown object A.

Here, the first and second motors 9 and 10 are
The rotation speed can be adjusted steplessly within the range of approximately 500 rotations/minute to 4000 rotations/minute.A variable speed motor is used, and the rotation speed can be adjusted by each motor 9 and 10.
This is done using knobs 9c and 10b provided on the back side of the.

A shaft 14 is installed at the lower part of the swing arm 2 described above, and an intermediate angle adjuster 15 of the shaft 14 is swingably mounted. The angle adjuster 15 is formed in an arc shape centered on the support shaft 3, and has a large number of engagement grooves 15a formed in the longitudinal direction of the lower part thereof. This engagement groove 15a allows engagement with and detachment from a locking plate 4 installed and fixed on the lower part of the support column 2.

Next, the operation of the above configuration will be explained. first,
The angle adjuster 15 is operated to select the throwing angle α of the ball opening 8f with respect to the ground. That is, when increasing the throwing angle α, the angle adjuster 15 is attached to the locking plate 4.
When the rear engagement groove 15a is engaged, the swing arm 5 rotates in the direction of arrow A, and the guide gutter 8, second motor 10, and second rotary body 13 move toward the support shaft. Rotate clockwise in Fig. 2 around 3,
The throwing angle α increases, and the thrown object A that is thrown from the ball opening 8f forms a large mountain.

Furthermore, in order to reduce the throwing angle α, by engaging the engagement groove 15a on the front side with the engagement plate 4 in the opposite manner to the above, the swinging arm 5 rotates in the direction of arrow A, and the guide trough 8 and second motor 10/second rotating body 13
rotates to the left in FIG. 2, and the object A to be thrown from the ball opening 8f forms a small mountain.

Next, the rotation speeds of the first and second motors 9 and 10 are selected by operating the knobs 9c and 10c, respectively. In this case, if the first motor 9 is selected to have a faster rotation speed than the second motors 10, 10, the first
The rotating body 12 rotates faster than the second rotating body 13, so that the object A to be thrown from the ball throwing port 8f is rotated forward, that is, rotated to the left in FIG. 2, and becomes a so-called drive ball.

Furthermore, if the rotational speeds of the first and second motors 9 and 10 are selected to be the same, the first and second rotating bodies 12 and 13 will have the same rotational speed, and as a result, the ball being thrown will not rotate and the ball will be thrown at the ball opening. The ball is thrown from the ground, resulting in a so-called flat ball.

Furthermore, if the second motor, and thus the second rotating body 13, is selected to have a higher rotational speed than the first motor and therefore the first rotating body 12, the ball to be thrown from the ball throwing port 8f, A. The ball rotates in the opposite direction, that is, to the right in FIG. 2, resulting in a so-called sliced ball.

After selecting the ball throwing angle α of the ball throwing port 8f and the rotational speed of each rotary body 12, 13 as described above, if the thrown object A is supplied from the supply port 8e, the thrown ball object A will first be rotated through the second rotation. The first rotating body 12 is rotated to the left in FIG. The second rotating body 12 biases the ball in a direction to cancel the left rotation, and the ball is thrown forward from the ball opening 8f under the rotational force of both rotating bodies 12 and 13.

As explained above, the present invention provides two rotating bodies in the guide trough that rotate in different directions and whose rotational speeds can be changed, thereby allowing the ball to be thrown, which is supplied into the guide trough, to be thrown. By doing so, it is possible to obtain a variety of ball qualities, and it is possible to adapt the ball to the skill level of the user, thereby achieving the effect that a ball throwing device that is suitable for a wide range of demand groups can be obtained.

Moreover, since the ball throwing device according to the present invention has a flat semi-cylindrical guide trough and a rotating body that moves simply as its main components, it can be made small and lightweight, and has the advantage of being highly portable. . In addition,
This invention can also be applied as a ball throwing device for baseball practice.

[Brief explanation of the drawing]

FIG. 1 is a front view of a ball throwing device according to the present invention, and FIG. 2 is a sectional view thereof. 1-base, 2-pillar, 3-support shaft, 4-locking plate, 5-swing arm, 6-backing plate, 7-bracket, 8-guide gutter, 8a, 8b-left and right side plates, 8c-
Bottom plate, 8d-upper plate, 8e-supply port, 8f-ball feeding port, 8g-notch hole, 9-first motor, 9a-rotating shaft, 9b-boss, 9c-knob, 11-leg, 1
0-second motor, 10a-rotating shaft, 10b-knob, 12-first rotating body, 13-second rotating body, 14-shaft, 15-angle adjuster, 15a-engaging groove, A- The object of the ball being thrown.

Claims (1)

[Scope of Claims] 1. A guide gutter in which the bottom plate is curved downward and a supply port and a ball sending port are formed approximately tangentially to the bottom plate is attached to the pedestal, and the outer periphery is placed within the guide gutter at a predetermined distance from the bottom plate. A first rotary body that is spaced apart is provided, and a second rotary body that rotates in the opposite direction to the first rotation is provided from the bottom plate on the throwing port side into the guide gutter.
A ball throwing device in which a part of the outer periphery of a first and second rotating body is exposed, and the rotational speed of each of the first and second rotating bodies can be varied. 2 The guide gutter is rotatably attached to the pedestal about the rotation axis of the first rotating body, and the second rotating body is rotated by a variable speed motor integrally connected to the guide gutter. A ball throwing device according to claim 1. 3. The ball throwing device according to claim 1 or 2, wherein the first and second rotating bodies have a soft friction body on their outer peripheries to a degree that does not damage the ball being thrown.