JPH0742449Y2 - Rotating wheel structure for ball acceleration in pitchers - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pitcher used for hitting practice of baseball, and more particularly to a rotary wheel structure for accelerating a ball in such a pitcher.

[0002]

2. Description of the Related Art In recent years, pitchers have been frequently used for batting practice of baseball and practice of catching a launched ball.

In such a pitching machine, conventionally, there is a pitching machine in which a pair of rotating wheels which rotate at high speed in opposite directions are arranged in parallel.
In this pitching machine, when a ball is supplied between the outer peripheral surfaces of the rotating wheels, the ball is sandwiched between the outer peripheral surfaces and frictionally joined to the outer peripheral surfaces. Is being thrown vigorously forward.

Conventionally, the rotary wheel has a conventional flat opening of 1-754.
Japanese Patent Laid-Open No. 78 (this is referred to as a first conventional technique ), and
JP-A-55-89469 (this is referred to as the second conventional technology)
There is one that is shown.

According to these, each of the rotating wheels has a disk shape.
Of the board and the outside of the board on the axis of the board.
The middle part in the axial direction is attached to the outer peripheral edge of this board
Cylindrical support drum and outer peripheral surface of this support drum
And a ring-shaped rubber elastic body that is vulcanized and bonded to.

[0006] When high-speed rotation so that the rotating ring has said elastic member is stretched Tsu pull <br/> radially outwardly by centrifugal force to elastically deform, and, this time, ibid elastic body Haso
Each end side in the axial direction of the
It deforms elastically. Therefore, the axial direction of the outer peripheral surface of the support drum
Elasticity is the same as above, starting from the adhesive part of the elastic body to the facing edge.
The body tries to peel from the outer peripheral surface.

Therefore, in the first prior art, the elastic body
Extend each axial end to the outside of the support drum
At the same time, attach this extension to the inner surface of the support drum.
To extend and adhere, thus preventing the above peeling
is doing.

On the other hand, in the second prior art, the supporting drum
Extend each axial end of to the outside of the elastic body,
Fit each end of the elastic body in the axial direction to the extension,
This prevents the peeling.

[0009]

[Problems to be Solved by the Invention] However, the above-mentioned first conventional method
According to the technology, by providing an extension on the elastic body,
In order to throw a ball, this elastic body becomes unnecessary in its axial direction.
It means that the rotating wheel becomes too large.
There's a problem.

Further , according to the second prior art, the supporting drum
In the case of the above-mentioned first prior art, by providing the extension part in the
In the same way as in, when this ball is thrown, this support drum
It becomes unnecessarily large in its axial direction, that is, the rotating wheel
There is a problem that it becomes large every time.

[0011]

SUMMARY OF devised] This invention has been made by focusing on the above situation, the elastic body from the outer peripheral surface of the support drum
In addition to surely preventing peeling , in this case
Also keeps the rotating wheel compact and oversized
The purpose is not to be.

[0012]

The features of the present invention for achieving the above-mentioned objects are that they rotate in opposite directions.
A pair of rotating wheels are installed side by side, and
Put the ball between the two and throw it.
-Shaped board, and fit onto this board on the axis of this board,
The middle part in the axial direction is attached to the outer peripheral edge of this board
A cylindrical support drum to be, in the configuration with the ball throwing machine by a rubber elastic body that is vulcanization bonded to the outer peripheral surface of the support drum, the axial edge of the outer peripheral surface of the support drum, ibid
Projected outward in the radial direction from the axial middle part of the outer peripheral surface
The same as above, but also each part in the circumferential direction of the axial end edge of the outer peripheral surface
Is formed so as to have an arcuate convex surface projecting outward in the radial direction, and each of the support drum and the elastic body is formed.
The end faces in the axial direction are substantially flush with each other .

[0013]

[Operation] The operation of the above configuration is as follows.

As shown in FIG. 1, the rotating wheel 2 for accelerating the sphere 10 is mounted on the disk-shaped substrate 16 and on the axis of the substrate 16.
To the outer periphery of this substrate 16 and
Cylindrical support drum to which the middle part of the axial direction is attached
17, In no event constituted by the rubber elastic body 14 is vulcanization bonded to the outer peripheral surface 13 of the support drum 17, the
The axial edge 13a of the outer peripheral surface 13 of the support drum 17,
Its radial direction than the shaft Direction of intermediate portion 13b of the same outer peripheral surface 13
In the axial direction of the outer peripheral surface 13
Outer circumferential each part of the cross section of the same radial edge 13a to the
It is formed so as to have an arcuate convex surface that projects toward it .

For this reason, the edge 13a has a circular arc convex surface.
Of the support drum 17 for adhering the elastic body 14
The area of the outer peripheral surface 13 becomes large, that is, the outer peripheral surface 1
The adhesive strength of the elastic body 14 to 3 is increased.

Then, as described above, each edge 13a is
Adhesive strength of the elastic body 14 to the outer peripheral surface 13 as an arc convex surface
And the support drum 17
The respective axial end faces of the elastic body 14 are substantially
It's flush.

Therefore, the support drum 17 and the elastic body 14 are
To the specified adhesive strength
The degree will be secured.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 2 and 3, reference numeral 1 is a pitching machine, and the pitching machine 1 has a pair of upper and lower rotary wheels 2 and 2 whose axes are horizontal and parallel to each other. A casing 4 is supported by a casing 3, and the casing 4 is supported by a pedestal 5 which can be moved by carrying.

Reference numeral 7 denotes an electric motor, which is also supported by the casing 4, and the rotating wheels 2 are linked to the electric motor 7 by belt transmission means 8. When the electric motor 7 is driven, the rotating wheels 2 and 2 rotate in opposite directions via the belt transmission means 8 (arrow R in FIG. 2). 9 is a supply chute, and this supply chute 9 guides a ball 10 to be pitched between the two rotating wheels 2 and 2.

Each rotating wheel 2 has a bolt 1 attached to the support shaft 3.
It is composed of a metallic boss portion 12 screwed by 1 and a rubber annular elastic body 14 vulcanized and bonded to an outer peripheral surface 13 of the boss portion 12.

When the sphere 10 is supplied between the outer peripheral surfaces 15, 15 of the rotating two rotating wheels 2, 2 through the supply chute 9, the sphere 10 is first of all, as indicated by the phantom line in FIG. It is sandwiched between the outer peripheral surfaces 15 and 15. Then,
The ball 10 is frictionally joined to each outer peripheral surface 15, and the frictional force at this time causes the ball 10 to be vigorously thrown in a desired direction as shown by an arrow B in FIG.

[0023] In FIGS. 1 to 4, the boss 12 is cast aluminum, on the same axis as the spindle 3, the spindle 3
A disk-shaped substrate 16 that is screwed onto the bolt 16
And, on the axis of the substrate 16 , is fitted onto the substrate 16 ,
And, short cylindrical support drum 1 fit these intermediate portion of the axial direction on the outer peripheral edge of the substrate 16 with one <br/>-forming
7 and 7.

The outer circumferential surface 15 of the elastic body 14 is a circumferential groove having a circular arc concave section. As a result, the contact area with the ball 10 is increased, and an accurate pitch of the ball 10 can be obtained.

[0025] FIGS. 1, 3, and 4, the axial Kakutan'en 13a of the outer peripheral surface 13 of the boss 12, 13a
Protrudes outward in the radial direction from the axial direction of the intermediate portion 13b of the outer peripheral surface 13, over the entire circumference of the outer peripheral surface 13, half the cross-section of the circumferential direction each portion protrudes outward of the same radial It is a circular arc convex surface. In this way, the end
The elastic body 14 is bonded by the amount that the edge 13a is formed into a circular arc convex surface.
The area of the outer peripheral surface 13 of the support drum 17 for
As a result, the elastic body 14 with respect to the outer peripheral surface 13 is
The adhesive strength is increased.

Therefore, when the rotary wheel 2 rotates at a high speed, the elastic body 14 is radially outward (arrow A in FIGS. 1 and 4) by centrifugal force, as shown by phantom lines in FIGS. 1 and 4. Even when elastically deformed, the elastic body 14 from the outer peripheral surface 13 of the boss portion 12
Is more reliably prevented from peeling off.

Then, as described above, each edge 13a is
Adhesive strength of the elastic body 14 to the outer peripheral surface 13 as an arc convex surface
And the support drum 17
The respective axial end faces of the elastic body 14 are substantially mutually
It is said to be the same.

Further, since the end edge 13a is projected outward in the radial direction, the end edge 13a serves as a rib for reinforcing the support drum 17. Therefore, the wall thickness of the support drum 17 can be reduced accordingly, and the boss portion 12 can be made lighter.

The pitching machine 1 may be for a soccer ball, a volleyball, or a tennis ball. Further, by making the base plate 16 bilaterally symmetrical in the axial direction, the rotary wheel 2 is made bilaterally symmetrical in the same axial direction, so that the rotary wheel 2 can be attached to the support shaft 3 on either the front or back side. Good.

[0030]

According to the present invention, the rotating wheel for sphere acceleration is provided on the disc-shaped substrate and on the substrate on the axis of the substrate.
And the axial middle part is formed on the outer peripheral edge of this substrate.
A cylindrical support drum mounted, when configured in this support drum <br/> rubber elastic body which is bonded by vulcanization to the outer peripheral surface of the axial end edge of the outer peripheral surface of the support drum, Same as above
Projected outward in the radial direction from the axial middle part of the outer peripheral surface
At the same time, the cross section of each circumferential portion of the axial end edge of the outer peripheral surface is formed to be a circular arc convex surface protruding outward in the radial direction .

Therefore, since the above-mentioned edge is a circular arc convex surface,
The area of the outer peripheral surface of the support drum for adhering the elastic body is
That is, the adhesive strength of the elastic body to the outer peripheral surface increases.

Then, as described above, each edge is arcuately convex.
Improves the adhesive strength of the elastic body to the outer peripheral surface
The support drum and the elastic body, respectively.
Their axial end faces are substantially flush with each other.

For this reason, the conventional technique can be applied to the supporting drum and the elastic body.
The required adhesive strength is secured without the need for surgical extension.
Will be done.

Therefore, the elastic body from the outer peripheral surface of the support drum
Even if it is designed to prevent the peeling of the
Keep it pact and it becomes overly large
Is prevented.

By the way, the support drum is in the axial direction of the support drum.
Since the intermediate part is attached to the substrate, the rotating wheel rotates at high speed.
When rolling, centrifugal force will force each end of the support drum
It is considered that large stress is generated at the edges.

In this case, as described above, the edge is
Since it is projected outward in the direction, this edge is
Will function as a rib that effectively reinforces.

Therefore, the elastic body from the outer peripheral surface of the support drum
By the edge configured to prevent peeling of the
Has the advantage that the supporting drum is reasonably reinforced,
Also, the outer edge of the edge is covered by the elastic body.
As a result, the above-mentioned reinforcement will reduce the appearance of the rotating wheel.
It is prevented that this appearance is kept good
There is also the advantage that

[Brief description of drawings]

FIG. 1 is a partially enlarged view of FIG.

FIG. 2 is a perspective view of a pitcher.

FIG. 3 is a partially enlarged rear view of the pitcher.

FIG. 4 is a partially enlarged view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pitcher 2 Rotating wheel 10 Ball 12 Boss portion 13 Outer peripheral surface 13a End edge 13b Midway portion 14 Elastic body 15 Outer peripheral surface 16 Substrate 17 Support drum

Claims (1)

[Scope of utility model registration request] 1. A juxtaposed a pair of rotating wheels rotating in opposite directions, so as to throw across the sphere between the outer peripheral surfaces of the two rotary wheels, the respective rotation wheel, a disk-shaped substrate , This base
It is fitted onto this board on the axis of the board, and the outer circumference of this board
Cylindrical support with its axial midpoint attached to the rim
And the drum, in the construction the ball throwing machine by a rubber elastic body that is vulcanization bonded to the outer peripheral surface of the support drum, the axial edge of the outer peripheral surface of the support drum, ibid outer peripheral surface
Project outward in the radial direction than the middle part in the axial direction
Together, and formed to have an arcuate convex surface circumferential direction each part of the cross section of the axial end edges of the same outer peripheral surface protrudes outward of the same radial, each axis of the support drum and the elastic member
A rotating wheel structure for accelerating a ball in a pitcher in which the end faces in the same direction are substantially flush with each other .