JPH0591756U - Rotating wheel structure for ball acceleration in pitchers - Google Patents

Abstract

(57) [Summary] [Purpose] When a ball is pitched between the outer peripheral surfaces of both rotating rotary wheels, the ball is prevented from slipping against the outer peripheral surface of the rotary wheel, and accurate pitching is achieved. To be obtained. [Structure] The sphere 1 is placed between the outer peripheral surfaces 15 of the two rotating wheels 2.
Try to throw a ball across 0. A plurality of recesses 16 are formed on the outer peripheral surface 15 of the elastic body 14 constituting the outer peripheral portion of the rotary wheel 2 at substantially equal intervals in the circumferential direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pitcher used for batting practice of baseball and the like, and more particularly to a rotary wheel structure for accelerating a ball in such a pitcher.

[0002]

[Prior Art]

 In recent years, pitchers have been frequently used for baseball batting practice and practice of catching a ball that has been launched. Conventionally, such a pitching machine includes a pair of rotating wheels arranged in parallel and rotating in opposite directions at a high speed. In this pitcher, when a ball is supplied between the outer peripheral surfaces of the two rotating wheels, the ball is sandwiched between the outer peripheral surfaces and frictionally joined to the outer peripheral surfaces. The ball is thrown vigorously forward.

[0003]

[Problems to be solved by the device]

 By the way, the outer peripheral surface of the above-described conventional rotary wheel is a smooth surface, and a ball may slip on the outer peripheral surface, which may result in inaccurate pitching. Further, there is a problem that such a slip is particularly likely to occur in the case of a soft ball having a soft ball.

[0004]

[The purpose of the device]

 The present invention has been made in view of the above circumstances, and when a ball is thrown by sandwiching a ball between both outer peripheral surfaces of both rotating rotating wheels, a ball is thrown against the outer peripheral surface of the rotating wheel. The aim is to prevent slipping and to obtain an accurate pitch.

[0005]

[Means for Solving the Problems]

 A feature of the present invention for achieving the above object is that a plurality of recesses are formed at substantially equal intervals in the circumferential direction on the outer peripheral surface of the elastic body that constitutes the outer peripheral portion of the rotary wheel.

[0006]

[Work]

 The operation of the above configuration is as follows. When the ball 10 is pitched between the outer peripheral surfaces 15 of the two rotating rotating wheels 2 and the ball is thrown, the outer peripheral surface 15 of the elastic body 14 forming the outer peripheral portion of the rotating wheel 2 has a circumferential direction. A plurality of recesses 16 are formed at substantially equal intervals. For this reason, the frictional force of the ball 10 on the outer peripheral surface 15 increases, and the slip of the ball 10 on the outer peripheral surface 15 is prevented accordingly.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. Example 1 FIGS. 1 to 5 show Example 1. In FIG. 2 and FIG. 3, 1 is a pitching machine, and this pitching machine 1 has a pair of upper and lower rotating wheels 2 and 2 whose axes are horizontal and are parallel to each other. The casing 4 is supported by a casing 4, and the casing 4 is supported by a pedestal 5 that can be moved by carrying.

Reference numeral 7 denotes an electric motor, which is also supported by the casing 4. 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 of the rotating wheels 2 is vulcanized and adhered to the outer peripheral surface 13 of the metal boss 12 and the boss 12 which are screwed to the support shaft 3 with bolts 11. And an annular elastic body 14 made of rubber that constitutes an outer peripheral portion. When the sphere 10 is supplied between the outer peripheral surfaces 15 and 15 of the two rotating wheels 2 and 2 via the supply chute 9, the sphere 10 firstly has the outer peripheral surface as shown by the phantom line in FIG. It is sandwiched between 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.

In FIGS. 1 to 4, the boss portion 12 is an aluminum casting, is coaxial with the support shaft 3, and is a disk-shaped substrate 16 screwed to the support shaft 3 with a bolt 11. The plate 16 is coaxial with the plate 16, and is formed of a short cylindrical support drum 17 integrally formed with the outer peripheral edge of the substrate 16. The outer peripheral 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 the accurate pitching of the ball 10 can be obtained.

In FIGS. 1 and 3 to 5, the outer peripheral surface 15 of the elastic body 14 is formed with a plurality of recesses 16 at substantially equal intervals in the circumferential direction. Each of the recesses 16 has a groove shape extending in the axial direction of the outer peripheral surface 15 and has a U-shaped cross section. Further, in each of the concave portions 16, the diameter of the sphere 10 is 60 to 70 mm, while the groove width and the depth are 5 to 10 mm and the pitch is 20 to 40 mm. Further, the groove length 1 of the recess 16 is made smaller than the width dimension L of the elastic body 14, and the respective axial end edges 15a, 15a of the outer peripheral surface 15 of the elastic body 14 are the unformed portions of the recess 16. Is becoming

By the way, when the rotary wheel 2 rotates at a high speed, the elastic body 14 is pulled radially outward by its centrifugal force and elastically deforms, and at this time, the edge 15 a of the outer peripheral surface 15 of the elastic body 14 is deformed. Particularly large stress occurs. Therefore, in order to maintain the strength against this in the end edge 15a, the recess 16 is not formed in the end edge 15a as described above.

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

The following figures show other embodiments. It should be noted that the same reference numerals are given to the drawings for the configurations and operations common to each of these embodiments and the above-described first embodiment, and the overlapping description will be omitted, and different parts will be described.

Second Embodiment FIG. 6 shows a second embodiment in which the recess 16 has a rectangular cross section.

Third Embodiment FIG. 7 shows a third embodiment in which the recess 16 has a V-shaped cross section.

Example 4 FIGS. 8 and 9 show Example 4, in which the recess 16 is a hemispherical surface (dimple).

(Fifth Embodiment) FIG. 10 shows a fifth embodiment in which the recess 16 has a flat V-shape in a plan view, and the rotary wheel 2 is located on either the recess side or the protrusion side of the recess 16. Can be rotated toward.

Sixth Embodiment FIG. 11 shows a sixth embodiment, in which each recess 16 has a flat shape in a plan view, and these recesses 16 are continuously provided. It has a zigzag shape.

[0020]

EFFECTS OF THE INVENTION According to the present invention, when the ball is thrown by sandwiching the ball between both outer peripheral surfaces of the rotating rotating wheels, the outer peripheral surface of the elastic body forming the outer peripheral portion of the rotating wheel is Since the plurality of concave portions are formed at substantially equal intervals in the circumferential direction, the frictional force of the sphere with respect to the outer peripheral surface is increased, and the slip of the sphere with respect to the outer peripheral surface is prevented accordingly. Therefore, since a pitch that matches the peripheral speed of the outer peripheral surface of the rotating wheel can be obtained, an accurate pitch can be obtained.

[Brief description of drawings]

FIG. 1 is a partially enlarged view of FIG. 3 in the first embodiment.

FIG. 2 is a perspective view of a pitching machine in the first embodiment.

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

4 is a sectional view taken along line 4-4 of FIG. 1 in Embodiment 1. FIG.

5 is a sectional view taken along line 5-5 of FIG. 1 in Embodiment 1. FIG.

FIG. 6 is a diagram corresponding to FIG. 5 in the second embodiment.

FIG. 7 is a diagram corresponding to FIG. 5 in the third embodiment.

FIG. 8 is a diagram corresponding to FIG. 1 in the fourth embodiment.

9 is a diagram corresponding to FIG. 5 in Example 4. FIG.

FIG. 10 is a diagram corresponding to FIG. 1 in Example 5.

FIG. 11 is a diagram corresponding to FIG. 1 in Example 6.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pitcher 2 Rotating wheel 10 Ball 14 Elastic body 15 Outer peripheral surface 15a End edge 16 Recess

Claims (1)

[Scope of utility model registration request] 1. A pair of rotating wheels that rotate in mutually opposite directions are arranged side by side, and the outer peripheral portion of each of these rotating wheels is molded with an elastic body,
A pitching machine in which a ball is pitched between the outer peripheral surfaces of these elastic bodies, and a plurality of recesses are formed at substantially equal intervals in the circumferential direction on the outer peripheral surfaces of the elastic bodies of the two rotating wheels. Rotating wheel structure for acceleration.