JPH10328381A - Pachinko machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make possible to cover a machine projecting on the rear side of a mechanism board by the cover even if the size of an image display device changes and thereby standardize cover parts. SOLUTION: An accessory enclosing cover 28 has openings in the front and the rear, three slender, nearly square cover mounting holes 33a to 33c, 34a to 34c are formed in the centers of both sides with an almost equal space, face-to-facedly. In addition, mounting pieces 36a to 36d are formed on the outsides of the edges of the front opening. The accessory enclosing cover 29 has an opening 37 in the front and its outside size and shape of a cross section vertical in the longitudinal direction is almost equal to the size and shape of the rear opening 32 of the accessory enclosing cover 28. Mounting projections 38, 39 with a prescribed height with a cross section almost equal to the cover mounting hole are formed in the positions corresponding to the cover mounting positions of the outsides of the right and left centers of the end face of the front opening 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball-and-ball game machine such as a pachinko game machine and a coin game machine, and more particularly, to a cover capable of changing the rear height of a rear portion of an image display device or the like penetrating an opening of a mechanism panel. Even if the size of the image display device etc. changes, it is possible to cover the equipment protruding from the back side of the mechanical panel with the same cover even if the size of the image display device changes, thereby standardizing the parts of the cover This is related to a simple ball and ball game machine. Further, the present invention relates to a ball game machine capable of improving product quality and working efficiency because it is not necessary to change a cover body for each model.

[0002]

2. Description of the Related Art Conventionally, CRs are used in game boards of ball-and-ball game machines.
T (Cathode Ray Tube) and LCD (Liquid Crystal Dis
play) etc. are attached. However, since these devices are large, they penetrate through the opening of the mechanical panel and project to the rear, and the spilled ball from the ball tank hits the rear of these devices and causes a failure. Various cover bodies for covering have been proposed. For example, in a back mechanism panel of a pachinko machine disclosed in Japanese Patent Application Laid-Open No. 6-15050, a rear end portion of a video display device configured by a CRT or the like mounted on a game board and protruding from the back of the game board is penetrated. An opening is opened substantially in the center, and a cover body having a bulging portion at the rear is attached so as to cover the opening and be openable and closable, and a video display device is provided between the back of the winning ball collecting gutter and the inside of the cover. It is stored to prevent the spilled ball from the upper prize ball tank from hitting the image display device or the like even if it falls.

[0003]

However, in the back mechanism panel of the pachinko machine described in the above-mentioned Japanese Patent Application Laid-Open No. Hei 6-15050, the size of the motorized center role and various image display devices is adjusted. Therefore, it is necessary to manufacture and store a plurality of types of covers having different swelling depths, and there is a problem that material management becomes complicated. In addition, it is necessary to change the cover body for each model at the time of assembling, and there is a problem that a mounting error or the like occurs, which lowers product quality and lowers work efficiency. Further, when the cover is opened during the game, the spilled ball from the upper prize ball tank falls and hits the rear portion of the video display device, causing a problem that the video display device breaks down.

Accordingly, the present invention has been made to solve the above-mentioned problems, and a rear portion of an image display device or the like penetrating through an opening of a mechanism panel is covered with a cover body whose height can be changed. Thus, even if the size of a video display device or the like changes, it is possible to cover a device protruding to the rear side of the mechanical panel with the same cover body, thereby enabling a ball game machine capable of standardizing parts of the cover body. The purpose is to provide.
It is another object of the present invention to provide a ball game machine capable of improving product quality and working efficiency because it is not necessary to change a cover body for each model. Still another object of the present invention is to provide a ball game machine capable of preventing a ball spilled from above from falling and hitting the rear portion of the video display device even when the cover is opened during a game.

[0005]

To achieve the above object, a ball game machine according to claim 1 is a ball game machine having a device protruding to the back side of a mechanism board, wherein the back face of the mechanism board is provided. A first cover body that surrounds the periphery of the device and is attached to the back surface of the mechanism panel; and a second cover that is detachably attached to the first cover body and covers the device.
A cover body, wherein the second cover body is detachably attached to the first cover body while adjusting the height from the rear surface of the mechanism panel in a plurality of steps.

According to the first aspect of the present invention having such a characteristic, the periphery of the device protruding from the rear side of the mechanical panel is surrounded by the first cover attached to the rear side of the mechanical panel. The rear part of the device is covered by a second cover body detachably attached to the first cover body.

[0007] This makes it possible to cover a device such as a video display device protruding from the rear side of the mechanical panel with the first cover and the second cover. In addition, even if the second cover body is removed from the first cover body during the game, since the rear part of the device protruding to the back side of the mechanical panel such as a video display device is covered by the first cover body, The falling ball can be prevented from hitting the rear part of the image display device or the like, and the reliability of the product can be improved.

[0008] The periphery of the device protruding to the back side of the mechanism panel is surrounded by a first cover body attached to the back side of the mechanism panel, and from the rear face of the mechanism panel in a plurality of steps with respect to the first cover body. The rear part of the device is covered with a second cover body that is detachably attached while adjusting the height of the device.

Accordingly, even if the rear height of the device protruding to the rear side of the mechanism panel such as a video display device changes, the mounting height of the second cover body is changed in a plurality of steps,
The device can be covered with the first cover and the second cover, and the components of the cover that covers the rear-side protruding portion can be standardized. Further, since it is not necessary to change the cover body of the rear side protruding portion for each model, it is possible to improve the product quality and the work efficiency.

In addition, even if the second cover body is removed from the first cover body during a game, the rear part of the device, such as a video display device, protruding from the rear side of the mechanical panel is covered by the first cover body. Also, it is possible to prevent a falling ball from above from hitting the rear part of the image display device or the like, and to improve the reliability of the product.

According to a second aspect of the present invention, a locking mechanism is provided between the first cover member and the second cover member. It is characterized by. In the ball game machine according to the second aspect having such a feature, the second cover is attached to the first cover by a locking mechanism.

Thus, the second cover body can be attached to the first cover body by the locking mechanism, so that the number of parts and the number of working steps can be reduced. In addition, the second cover body can be detachably attached to the first cover body at several relative positions, and there is no need to change the cover body that covers the device protruding to the back side for each model, so that the product quality can be improved. And the work efficiency can be improved, and the cover body can be standardized. Furthermore, even if the second cover body is removed from the first cover body during the game, since the rear portion of the video display device or the like is covered by the first cover body, a falling ball from above may cause the rear portion of the video display device or the like to fall. , And the reliability of the product can be improved.

Further, in the ball game machine according to a third aspect, in the ball game machine according to the second aspect, the locking mechanism is formed in one of the first cover body and the second cover body in a plurality of steps. And a locking projection elastically engageable and disengageable with respect to the locking hole of each step formed on the other of the first cover body and the second cover body. .

According to a third aspect of the present invention, there is provided a bullet-ball game machine having the above-mentioned features, wherein a plurality of locking holes formed in one of the first cover body and the second cover body are provided in the other cover body. The engagement protrusions formed on the cover members are elastically and detachably fitted to each other, so that the two cover members are engaged with each other.

Thus, the second cover body can be easily attached to the first cover body without using screws or the like, and the number of parts and the number of work steps can be reduced. In addition, the second cover body can be detachably attached to the first cover body at several relative positions, and there is no need to change the cover body that covers the device protruding to the back side for each model, so that the product quality can be improved. And the work efficiency can be improved, and the cover body can be standardized. Furthermore, even if the second cover body is removed from the first cover body during the game, since the rear portion of the video display device or the like is covered by the first cover body, a falling ball from above may cause the rear portion of the video display device or the like to fall. , And the reliability of the product can be improved.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a ball game machine according to an embodiment of the present invention.

First, the overall configuration of a pachinko machine according to the present embodiment will be described with reference to FIGS. FIG. 1 is a front view showing the entire pachinko machine according to the present embodiment.
FIG. 2 is a rear view showing the entire pachinko machine according to the present embodiment.

In FIG. 1, a pachinko machine 1 is a so-called first-class pachinko machine. In the pachinko machine 1, various structures such as a winning opening, an electric accessory, a gate, and a symbol display device 11 are arranged on the game board 2. Under the game board 2,
An upper tray 3 for receiving a prize ball discharged through a prize ball case 21 or the like (see FIG. 2) is provided on a plate 4 with a built-in speaker 3a. Below the upper tray 3, a lower tray 5 is provided. In addition, upper saucer 3
The pachinko ball of the upper receiving tray 3 is sent to a firing device (not shown) connected to the handle 6 via a ball feeding mechanism (not shown) communicating with the steering wheel 6.

On the other hand, around the game board 2, there are provided an error display lamp 7 for displaying an error during the game and a hit display lamp 8 for displaying a "hit". In a frame 9 surrounding the game board 2, prize balls and ball out indication lamps 10, 10 are provided on both shoulders.

The configuration of the game area on the game board 2 in the pachinko machine 1 will be described. In this game area, each structure such as a winning opening is arranged on a game board 2 made of a plate material having a predetermined thickness, and an annular rail 13 is erected to surround the structure. The rail 13 constitutes an overlapping guide path 14 for guiding the fired pachinko ball into the game area, and has a right shoulder for restricting the progress of the pachinko ball driven along the rail 13. Step 4
2 The step portion 42 is provided with a return rubber (not shown) which is pivotally supported.

A symbol display device 11 is disposed substantially at the center of the game area, and the symbol display device 11 includes left, middle,
Image display device 12 displaying a special symbol divided into three on the right
Are provided from the back side of the game board 2.

The video display device 12 is housed in a box-shaped video display device main body 60 (see FIG. 2), and the video display device 12 faces the front from the back side of the game board 2 and
It is attached to the back side of. This video display device 12
Is a CRT (Cathode Ray Tube) or LCD (Liquid Cryst)
al Display), and a display control device (not shown) for performing display control is integrally provided on the rear surface side.

Next, the structure of a synthetic resin mechanism set board 15 provided behind the game board 2 will be described with reference to FIG. The pachinko game machine 1 pays out a predetermined amount of pachinko balls as prize balls, and is formed on a mechanism set board 15 hinged to a frame 16 so as to be openable and closable. At present, the frame 16 is mainly made of resin, but is made of wood in the present embodiment.

At the uppermost stage of the pachinko game machine 1, a winning ball tank 17 opened upward is fixed to the mechanism set board 15. A replenishing device 18 is provided immediately above the prize ball tank 17, and a discharge portion 18a is hung down. Prize ball tank 17
A communication hole is formed in the inclined bottom surface, and an inclined tank rail 19 that can align and discharge pachinko balls is provided below the communication hole. In the prize ball tank 17,
The ground plate 20 is mounted on the side surface.

Further, in the prize ball case 21, a delivery gutter 22 for sending the pachinko ball on the downstream side of the tank rail 19 while further reducing the pressure is connected, and the number of pachinko balls passing through the delivery gutter 22 is confirmed. A switch, a delivery solenoid for adjusting the delivery of the pachinko ball, and the like (all not shown) are provided. A discharge section is formed on the downstream side of the delivery gutter 22, and a discharge path 23a and a discharge path 23b in which a lower tray full switch is housed are formed to open downward at the lower end.

At the substantially center of the mechanism set board 15, there is provided an opening 24 large enough to fit a winning ball collecting gutter (not shown) on the back of the game board 2. Is covered by a center cover 25 and a mechanism panel 26 on which various unit mechanisms are disposed. This mechanical panel 26
A through-hole having substantially the same size as the opening 24 is formed in a portion facing the opening 24. And the mechanical panel 2
The through hole 6 is covered with a center cover 25. On the back of the center cover 25, the game board 2
An opening 27 through which the image display device main body 60 mounted on the back surface of the device is inserted is formed.

The rear portion of the image display device main body 60 projecting from the opening 27 of the center cover 25 to the rear surface side is an accessory surrounding cover screwed by screws 30a to 30h around the rear end surface of the opening 27. 28 (see FIGS. 4 and 5). Then, the image display device main body 60
The rear end of the accessory surrounding cover 28 is
(See FIG. 3).

The main board 50 loaded in the board box is fixed in a state of being mounted on the center cover 25. The main board 50 constitutes a control circuit for controlling a game operation of the pachinko game machine 1 and the like. The control circuit includes a CPU capable of executing a control operation in a predetermined procedure, a ROM for storing operation program data, a RAM for writing and reading data, an input / output circuit, a clock generator, and the like. A microcomputer is attached.

Next, the accessory surrounding cover 28 and the accessory cover 29 will be described with reference to FIG. FIG. 3 is a perspective view of the accessory surrounding cover 28 and the accessory cover 29.

In FIG. 3, an accessory surrounding cover 28 formed of a synthetic resin such as a transparent or translucent ABS resin is a box having openings 31 and 32 on the front and rear surfaces.
Three elongated rectangular cover mounting holes 33a-33c, 34a-
34c are formed so as to face in a line in the front-rear direction at substantially equal intervals. Further, mounting pieces 36a to 36d are formed outside the edges of each side of the opening end face of the front opening 31. Screw mounting holes 35a to 3d are formed at both ends of the mounting pieces 36a to 36d.
5h is drilled.

An accessory surrounding cover 29 formed of a synthetic resin such as a transparent or translucent polycarbonate resin.
Has an opening 37 on the front surface, and the outer dimension of the cross section perpendicular to the front-rear direction is the rear opening 32 of the accessory surrounding cover 28.
It is a box approximately equal in size and shape. The cover mounting holes 33 are provided outside the left and right central portions of the end surface of the front opening portion 37.
a-33b, 34a-34c, the cross-sectional shape of the cover mounting holes 33a-33b, 34a-34c.
Mounting projections 38, 3 and
9 are formed.

Accordingly, the accessory surrounding cover 28 has the front end face of the opening 31 abutted against the peripheral edge of the opening 27 of the center cover 25, and the screws 30a to 30h are connected to the screw mounting holes 35a to 35h.
It is inserted into 35h and screwed. Then, mounting projections 38 on the left and right end surfaces of the front opening 37 of the accessory cover 29,
While bending 39 inward, it is fitted into the rear opening 32 of the accessory surrounding cover 28, and the accessory cover 29 is positioned at a position where the mounting projections 38, 39 face the respective cover mounting holes 33a to 33c, 34a to 34c. When the bending of the left and right side surfaces is removed, the mounting projections 38 and 39 are fitted into the predetermined cover mounting holes from the inside.
Thereby, the accessory cover 29 can be detachably fixed in the accessory surrounding cover 28 at three levels from the rear surface of the center cover 25.

Next, an example of a mounting state of the accessory cover 29 when a relatively thin video display device main body constituted by an LCD or the like is mounted on the back of the game board 2 will be described with reference to FIG. FIG. 4 is a central cross-sectional view of the accessory surrounding cover 28 and the accessory cover 29 when a relatively thin image display device main body is mounted on the game board 2 of the pachinko machine 1 according to the present embodiment.

In FIG. 4, the rear end of a relatively thin image display device main body 61 protrudes from the opening 27 of the center cover 25 mounted on the mechanism set board 15 into the accessory surrounding cover 28. As shown in FIG. 4, since the projection length of the image display device main body 61 from the rear surface of the center cover 25 is short, each of the mounting projections 38 and 39 of the accessory cover 29 is formed with each of the cover mounting holes 33 a on the front opening 31 side. , 34a from the inside. Thereby, the image display device main body 6
1 is covered with a accessory surrounding cover 28 and an accessory cover 29. Also, the accessory cover 29 and the image display device body 6
A connection cable and the like (not shown) are provided between the rear end of the first unit 1 and the first unit.

Next, an example of an attached state of the accessory cover 29 when a relatively large image display device main body constituted by a CRT or the like is mounted on the back of the game board 2 will be described with reference to FIG. FIG. 5 is a central cross-sectional view of the accessory surrounding cover 28 and the accessory cover 29 when a relatively large image display device main body is mounted on the game board 2 of the pachinko machine 1 according to the present embodiment.

In FIG. 5, the rear end of a relatively large image display device main body 62 projects from the opening 27 of the center cover 25 mounted on the mechanism set board 15 into the accessory surrounding cover 28. As shown in FIG. 5, since the projection length of the image display device main body 62 from the rear surface of the center cover 25 is long, each of the mounting projections 38 and 39 of the accessory cover 29 is provided with each of the cover mounting holes 33c on the rear opening 32 side. , 34c from the inside. Thereby, the image display device main body 6
The rear portion 2 is covered by a accessory surrounding cover 28 and an accessory cover 29. Also, the accessory cover 29 and the image display device body 6
A connection cable and the like (not shown) are arranged between the rear portion 2 and the rear portion.

As described above in detail, in the pachinko machine 1 according to the present embodiment, the front end 31 of the accessory surrounding cover 28 is provided at the rear end peripheral edge of the opening 27 of the center cover 25 attached to the mechanism panel 26. Is in contact with the screw 30
a to 30h are inserted into the screw mounting holes 35a to 35h and screwed. The mounting projections 38 and 39 on the left and right end surfaces of the front opening 37 of the accessory cover 29 are bent inward in accordance with the rear projection length of the video display device main body 60 projecting from the opening 27. The fitting projections 38, 39 are inserted into the rear opening 32 of the accessory surrounding cover 28, and the attachment projections 38, 39 are removed from the left and right side surfaces of the accessory cover 29 at positions facing the predetermined cover attachment holes. Are fitted into predetermined cover mounting holes from the inside. Thereby, the accessory cover 29 is fixed in the accessory surrounding cover 28 while forming a predetermined space with the rear end surface of the video display device main body 60.

Therefore, even if the height of the rear surface of the image display device main body 60 protruding rearward from the opening 27 of the center cover 25 changes, each of the mounting projections 38 of the accessory cover 29,
39 is adjusted to the height of the rear surface of the image display device main body 60 so that the cover mounting holes 33a to 33c and 34 of the accessory surrounding cover 28 are formed.
By fitting into any one of a to 34c, the same accessory surrounding cover 28 and the accessory cover 29 can cover the rear side protruding portions from the center cover 25 of the various video display device main bodies 60. Therefore, it is possible to standardize the parts of the cover body that covers the rear-side protrusion.

Also, the accessory cover 29 is attached to the accessory surrounding cover 2.
8 can be detachably mounted at three relative positions, and there is no need to change the cover on the back side protruding part for each model, so it is possible to improve product quality and work efficiency become. Further, the accessory cover 29 can be attached to the accessory surrounding cover 28 without using screws or the like, so that the number of parts and the number of work steps can be reduced.
Further, even if the accessory cover 29 is removed from the accessory enclosure cover 28 for maintenance or the like during the game, the rear portion of the image display device or the like is covered with the accessory enclosure cover 28, so the upper prize ball tank is provided. The falling ball from 17 can be prevented from hitting the rear portion of the image display device main body 60 and the like, and the reliability of the product can be improved.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various improvements and modifications can be made without departing from the gist of the present invention. Good.

(A) Three cover mounting holes 33a to 33c, 34a to 34c are provided on both side surfaces of the accessory surrounding cover 28, respectively.
Are formed, but four or more of each may be formed.

(B) Three cover mounting holes 33a to 33c, 34a to 34c on both sides of the accessory surrounding cover 28, respectively.
Are formed, but cover mounting holes may be formed on the upper and lower surfaces. However, the width of the cover mounting hole formed on the upper surface must be shorter than the diameter of the pachinko ball.

(C) The accessory cover 29 is fitted into the accessory surrounding cover 28 by the mounting projections 38 and 39 on the left and right end surfaces of the opening 37, but at predetermined positions on both side surfaces of the accessory cover 29. A screw hole is provided, and a long groove in the front-rear direction is formed on both side surfaces of the accessory surrounding cover 28. A screw is inserted into the long groove, and the screw is screwed into the screw hole. You may make it attach to arbitrary relative positions in the cover 28.

(D) Although the accessory surrounding cover 28 is screwed to the center cover 25, the center cover 25 and the accessory surrounding cover 28 may be formed integrally.

[0045]

As described above, according to the first aspect of the present invention, the periphery of the device protruding to the back side of the mechanism board is surrounded by the first cover body attached to the back face of the mechanism board. In addition, a rear portion of the device is covered by a second cover body detachably attached to the first cover body.

Accordingly, it is possible to provide a ball-and-ball game machine capable of covering a device such as a video display device protruding from the rear side of the mechanical panel with the first cover and the second cover.
In addition, even if the second cover body is removed from the first cover body during the game, since the rear part of the device protruding to the back side of the mechanical panel such as a video display device is covered by the first cover body, A ball game machine can be provided which can prevent a falling ball from hitting a rear portion of a video display device or the like and can improve the reliability of a product.

Further, the periphery of the device protruding to the rear side of the mechanical panel is surrounded by a first cover attached to the rear side of the mechanical panel, and the first cover is separated from the rear surface of the mechanical panel in a plurality of steps. The rear part of the device is covered with a second cover body that is detachably attached while adjusting the height of the device.

Thus, even if the rear height of a device protruding from the rear side of the mechanism panel such as a video display device changes, the mounting height of the second cover body is changed to change the first cover body and the first cover body. It is possible to provide a ball game machine in which the device can be covered by the two cover bodies and the cover body that covers the rear projection can be standardized. Further, since it is not necessary to change the cover body of the rear side protruding portion for each model, it is possible to provide a ball game machine capable of improving product quality and working efficiency.

Also, even if the second cover body is removed from the first cover body during the game, the rear part of the device protruding to the back side of the mechanical panel such as a video display device is covered by the first cover body. In addition, it is possible to provide a ball game machine that can prevent a falling ball from above from hitting a rear portion of a video display device or the like, and can improve the reliability of a product.

According to the second aspect of the present invention, the second cover is attached to the first cover by a locking mechanism. Thereby, the second cover body is moved to the first
A ball game machine which can be attached to a cover body by a locking mechanism and which can reduce the number of parts and the number of work steps can be provided. In addition, the second cover body can be detachably attached to the first cover body at several relative positions, and there is no need to change the cover body that covers the device protruding to the back side for each model, so that the product quality can be improved. And a work efficiency can be improved, and a ball game machine capable of standardizing a cover body can be provided. Furthermore, even if the second cover body is removed from the first cover body during the game, since the rear portion of the video display device or the like is covered by the first cover body, a falling ball from above may cause the rear portion of the video display device or the like to fall. And a ball game machine capable of improving the reliability of a product.

According to a third aspect of the present invention, there is provided a ball-and-ball game machine having a plurality of locking holes formed in one of the first cover and the second cover and a hole formed in the other cover. The locking projections are elastically and removably fitted to each other, and the two cover bodies are engaged.

Thus, the second cover body can be easily attached to the first cover body detachably without using screws or the like, and a ball-and-ball game machine capable of reducing the number of parts and the number of working steps is provided. can do. In addition, the second cover body can be detachably attached to the first cover body at several relative positions, and there is no need to change the cover body that covers the device protruding to the back side for each model, so that the product quality can be improved. And a work efficiency can be improved, and a ball game machine capable of standardizing a cover body can be provided. Further, during the game, the first cover
Even if the cover is removed, the rear part of the image display
Since it is covered with the cover, a falling ball from above can be prevented from hitting the rear portion of the image display device or the like, and a ball game machine capable of improving the reliability of the product can be provided. it can.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire pachinko machine according to the present embodiment.

FIG. 2 is a rear view showing the entire pachinko machine according to the embodiment.

FIG. 3 is a perspective view of the accessory surrounding cover and the accessory cover of the pachinko machine according to the present embodiment.

FIG. 4 is a central cross-sectional view of the accessory surrounding cover and the accessory cover when a relatively thin image display device main body is mounted on the game board of the pachinko machine according to the present embodiment.

FIG. 5 is a central cross-sectional view of the accessory surrounding cover and the accessory cover when a relatively large image display device main body is mounted on the game board of the pachinko machine according to the present embodiment.

[Explanation of symbols]

 1 pachinko machine, 2 game board, 12 video display device, 15 mechanism set board, 16 frame, 17 prize ball tank, 25 center cover, 26 mechanism board, 28 accessory enclosure, 29 accessory cover, 60, 61, 62 Image Display Main Body

Claims (3)

[Claims] 1. A ball game machine having a device protruding to the back side of a mechanical board, wherein a first cover body surrounding the periphery of the device on the back side of the mechanism board and attached to the back side of the mechanism board; A second cover body detachably attached to the first cover body and covering the device, wherein the second cover body has a height from a rear surface of the mechanical panel in a plurality of steps with respect to the first cover body. A ball game machine that can be attached detachably while adjusting the height. 2. The ball game machine according to claim 1, wherein a locking mechanism is provided between said first cover body and said second cover body. 3. The locking mechanism includes: a locking hole formed in one of the first cover body and the second cover body in a plurality of steps;
3. The bullet according to claim 2, further comprising a locking projection elastically engageable with and disengageable from each of the locking holes formed on the other of the first cover body and the second cover body. Ball game machine.