JP5322746B2 - Anti-fraud structure for pachinko machines - Google Patents

Description

The present invention is executed by inserting a piano wire or the like into a game board surface from a gap between an inner frame and a front frame that are pivotally supported so that one side end can be opened and closed by a shaft support provided at one side end of the outer frame. The present invention relates to a fraud prevention structure for pachinko machines that can effectively prevent fraud.

The pachinko machine has an outer frame assembled to the island facility of the game hall, an inner frame that supports the game board and is pivotally supported on one side edge by the outer frame, and a transparent covering the front of the game board And a front frame that supports the plate and is pivotally supported by a pivotal support provided at one edge of the inner frame so that the one edge can be rotated.
Conventionally, when the front frame is closed with respect to the inner frame that is attached to the outer frame, between the one side edge of the inner frame provided with the opening and closing shaft and the one side edge of the front frame. A fraudulent act is performed in which a cheating execution tool such as a piano wire or a cell board is inserted into the game area from the formed gap and interferes with a game ball or a board component to advance the game advantageously for the player.

In order to prevent such fraud, JP-A-8-164248 discloses that a fraud prevention piece made of a soft material straddles between the inner rail and the glass surface, thereby inserting the fraud executor. A technique for preventing the above is disclosed.
However, in this conventional technique, only the area where the inner rail is arranged can only prevent the insertion of the fraudulent execution tool, and the board area has expanded with the increase in the size of the symbol display device. In pachinko machines, it is possible to insert a fraud executor from an area where the inner rail is not arranged, which is insufficient to prevent fraud.
In order to cope with such a problem, Japanese Patent Application Laid-Open No. 2008-289778 has a rib having a U-shaped cross section at the left edge of the inner frame holding the game board and holds a glass plate covering the game board. An I-shaped rib is provided on the left edge of the front frame, and when the front frame is closed with respect to the inner frame, the I-shaped rib fits into the recess of the U-shaped rib and the gap between the two frames A fraud prevention structure has been proposed that fills the gap.
However, since the fixed surface of the U-shaped rib is located in the gap between the inner frame and the front frame, the cheating execution tool such as a bar or driver is inserted through the gap and the rib is removed from the inner frame to execute the cheating action. It was possible to form a new gap into which the tool was inserted, which was not sufficient to prevent fraud.

JP-A-8-164248 JP 2008-289778 A

As described above, in the conventional pachinko gaming machine, when the front frame is closed with respect to the inner frame, the piano wire, the cell board, etc. are inserted into the game area from the gap formed between the side edges of both frames. It was possible to plug in and cheat. In order to fill the gap, ribs are also provided at positions along one end of the inner frame and the front frame. However, if the rib is broken by a tool, a gap for inserting a piano wire or the like is newly provided. Can be formed.
The present invention has been made in view of the above, and an inner frame that is frequently opened and closed when it is installed in a game arcade, and a front frame, the side of both frames when the front frame is closed with respect to the inner frame. In order to prevent cheating by inserting a cheating tool into the game area from the gap formed between the edges, when the ribs for filling the gap are fixed to both frames, the ribs are destroyed and removed. The object of the present invention is to provide a fraud prevention structure that makes it difficult to prevent fraud.

In order to achieve the above object, the invention of claim 1 is directed to an outer frame having a shaft support portion on one side, an inner frame that supports a game board and is pivotally supported by the shaft support portion so that the one side portion can be rotated. In a pachinko gaming machine comprising: a frame; and a front frame that supports a transparent plate that covers a front surface of the game board and is pivotally supported on one side by the pivotal support. A metal side plate fixed to the part or integrated in advance, the metal side plate including an extension piece projecting forward beyond the front surface of the outer frame, and a rib obtained by bending the front end edge of the extension piece inward. And the rib fits in a gap formed between each side of the inner frame and the front frame when the front frame is closed with respect to the outer frame with the inner frame sandwiched therebetween. The front frame is fitted close to the rib when the front frame is in the closed position with respect to the outer frame; A tamper-proof member having a recess that is detached from the rib when in the open position, and the tamper-proof member includes the recess and a front extension piece that extends forward from the recess. It is characterized by.
While the front frame that is frequently opened and closed with respect to the inner frame needs to be opened and closed smoothly, there is a demand for not forming a gap in order to prevent intrusion by an illegal act execution tool. In order to fill the gap formed in the hinge part of the inner frame and the front frame, if a rib for preventing intrusion is provided in each frame, the fixing part such as the rib is exposed from the gap. If it was removed, it was possible to form a gap for entry. In the present invention, the intrusion prevention member is not disposed at one end of the inner frame, but a rib formed by extending a metal side plate fixed to one end of the outer frame forward is formed between the inner frame and the front frame. The rib is configured to be inserted into the gap so that the rib can be surrounded by a recess provided at one end of the front frame.
Further, since the front extension piece integrated with the front end portion of the recess is integrated with the metal base constituting the skeleton of the front frame, it becomes difficult to remove the fraud prevention member from the front frame using a bar or the like.
In addition, when the rib is fitted in the recess, the inner angle θ of the recess adjacent to the tip of the rib is an acute angle, and the rear surface of the locking piece is substantially parallel to the rear locking portion. When fitted, it is guided by the rear surface, and the rib tip is deformed in the rear direction approaching the proximity portion. Further, if the bar is inserted into the gap between the rib and the recess, the rib is further deformed in a direction of biting into the recess, so that it becomes more difficult to unlock the rib and the recess.

According to a second aspect of the present invention, in the first aspect, the front portion of the front extension piece is integrated with a metal substrate constituting the front frame.
According to a third aspect of the present invention, in the first or second aspect, the outer surface of the front extension piece is covered with a part of an exterior member that covers the outer surface of the metal base of the front frame.
When the concave portion integrated with the metal substrate is to be pry open with a bar or the like, the exterior member needs to be damaged, so that a scar of fraud can be left.
The invention of claim 4 is characterized in that, in claim 3, a part of the exterior member closes the gap when the front frame is closed.
The rear end portion of the side exterior member becomes an obstacle, making it difficult to insert the bar through the gap. If you try to force the bar and insert it, the side exterior member will be damaged, so you can know that an illegal act has been performed.
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, when the rib is fitted into the concave portion, the inner angle of the concave portion adjacent to the tip of the rib is an acute angle shape. .
When the rib is fitted, the inner angle of the recess that the rib tip approaches is made acute, so the rib tip approaches the acute angle when the rib is fitted into the recess. For this reason, the lock | rock with a rib and a recessed part is strengthened. In addition, when trying to pry using a bar, the rib is deformed and prying is made more difficult.

In the present invention, when the front frame is closed with respect to the outer frame with the inner frame interposed therebetween, the rib extending from the metal side plate fixed to one end of the outer frame is a gap between the inner frame and the front frame. Since it goes in, it can prevent reliably inserting the piano wire, a cell board, etc. from a clearance gap by cooperation with the recessed part provided in the front frame. Moreover, there are no metal plates or ribs that can be removed by a bar or the like by being fixed to the inner frame, and the ribs extend from the metal side plates fixed to the outer frame, and the outer frame is sandwiched between the inner frames. When the front frame is closed with respect to the frame, the extension piece and the rib block the gap between the inner frame and the front frame, so that a fixing part that can be removed from the frame by a bar or the like is exposed in the gap. Not. Therefore, even if a bar or the like is inserted into the gap from the outside, it is impossible to enter between the rib and the recess and further increase the interval between them, or to destroy and remove either one, There is no room for forming a new gap for inserting a piano wire or the like, and it is possible to effectively prevent fraud.
Further, since the front extension piece integrated with the front end portion of the recess is integrated with the metal base constituting the skeleton of the front frame, it becomes difficult to remove the fraud prevention member from the front frame using a bar or the like.
The protruding direction of the rib is set in the same direction as the tangent on the arc-shaped movement path of the concave portion at the closing position where the rib and the concave portion are engaged, so that the engagement between both can be performed smoothly and firmly. .

1 is an external perspective view of a pachinko gaming machine provided with a fraud prevention structure according to an embodiment of the present invention. FIG. 2 is a perspective view of the pachinko gaming machine of FIG. 1 in a state where only the front frame is opened with respect to the outer frame and the inner frame in a closed state. FIG. 2 is a perspective view showing a state in which both the front frame and the inner frame are opened with respect to the outer frame in the pachinko gaming machine of FIG. 1. It is an external view of a single outer frame. FIG. 4 shows a state in which a supported part of a front frame is supported by a shaft part of a single outer frame (inner frame is omitted), (a) is an open state, and (b) is a perspective view showing a closed state. . It is composition explanatory drawing of the characteristic part of this invention. (A) (b) And (c) is a cross-sectional view which shows the opening-and-closing state of the principal part of the fraud prevention structure of this invention. (A) (b) And (c) is the schematic (plane cross-sectional view) which shows the structure of the latching | locking part provided with the fraud prevention structure which concerns on other embodiment of this invention.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.
FIG. 1 is an external perspective view of a pachinko gaming machine provided with a fraud prevention structure according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a state in which the outer frame and the inner frame are closed in the pachinko gaming machine of FIG. FIG. 3 is a perspective view showing a state in which only the front frame is opened, FIG. 3 is a perspective view showing a state in which both the front frame and the inner frame are opened with respect to the outer frame in the pachinko gaming machine of FIG. 1, and FIG. FIG. 5 shows a state in which the supported part of the front frame is pivotally supported by the pivotal part of the outer frame alone (the inner frame is omitted), (a) is an open state, and (b). Fig. 6 is a perspective view showing a closed state, Fig. 6 is an explanatory diagram of the structure of the characteristic part of the present invention, and Figs. 7 (a), (b) and (c) are the fraud prevention structure (inner frame) of the present invention. It is a cross-sectional view showing the open / closed state of the main part of FIG.

As shown in each figure, the frame structure of the pachinko gaming machine 1 has plate-like shaft support portions 3 and 4 projecting forward from the upper and lower end portions of one side end (left end) 2a of the rectangular frame-shaped outer frame 2, respectively. Thus, the supported parts 21 and 22 projecting forward from the upper and lower ends of one side end (left side end) 20a of the inner frame (game board mounting frame) 20 for supporting the game board, and the outside for supporting the glass plate. By simultaneously supporting the supported portions 31 and 32 projecting forward from the upper and lower end portions of one side end portion (left end portion) 30a of the frame (glass frame) 30, the inner side with respect to the outer frame 2 is supported. The frame 20 and the front frame 30 are supported to be freely opened and closed.
The upper shaft support portion 3 of the shaft support portions 3 and 4 of the outer frame 2 has a configuration in which a substantially circular (Ω-shaped) cutout portion 3a is formed at the tip of the plate-like piece, and the lower shaft support portion 4 is The plate-shaped piece is provided with a shaft hole 4a.
The pivoted support portions 21 and 22 of the inner frame 20 include notch portions 3a provided in the respective pivotal support portions 3 and 4 of the outer frame, and shaft holes 21a and 22a aligned with the shaft holes. 31 is in contact with the upper surface of the upper shaft support portion 3, and the lower supported shaft portion 32 is in contact with the lower surface of the lower shaft support portion 4.

The upper supported portion 31 on the upper side of the front frame 30 has a configuration in which a pin (not shown) supported so as to be freely retractable in a hole provided on the upper surface thereof is elastically urged upward, and the lower supported portion 32 is provided on the upper surface. It has a configuration in which a pin (not shown) supported so as to be able to appear and retract in the hole is elastically biased upward. Each pin provided in each supported shaft 31, 32 is connected to each supported portion (shaft hole 21 a, 22 a) of the inner frame 20 with respect to the supported shaft 3, 4 (notch 3 a, shaft hole 4 a) of the outer frame 2. ) In communication with each other (notch portion 3a and shaft hole 21a, shaft hole 4a and shaft hole 22a), respectively, so that each pin serves as a rotation center on the shaft support portion of the outer frame. On the other hand, the inner frame and the front frame are independently supported to be opened and closed.
In addition, the assembly structure of each of the above-mentioned shaft support parts and each of the supported shaft support parts is only an example, and the shape, structure, assembly position relationship, etc. of each part can be variously selected and modified. The fraud prevention structure of the present invention is also applicable.

The fraud prevention structure of the present invention supports the outer frame 2 having the shaft support portions 3 and 4 on the one side end 2a, the game board, and the one side end 20a (the supported shaft support portions 21 and 22 by the shaft support portions 3 and 4). ) And a glass plate (transparent plate) that covers the front surface of the game board and is pivotally supported so as to be rotatable in a substantially horizontal direction. , 32) in a pachinko gaming machine that is pivotally supported so as to be pivotable in a substantially horizontal direction, and is fixed along the one side end surface of the outer frame 2 or integrated in advance with the metal side plate 40. The structure and the structure of the anti-fraud member 50 provided on the front frame 30 have one characteristic.
That is, the metal side plate 40 includes a base piece fixed to or integrated with one end of the outer frame, an extension piece 41 protruding forward from the front end edge of the base piece beyond the front surface of the outer frame, It has an L-shape in plan view including a rib 42 whose front end edge is bent inward. The metal side plate 40 may be retrofitted with bolts or the like, or may be integrated with one end of the outer frame at the time of manufacturing the outer frame.
When the front frame 30 is closed with respect to the outer frame 2 with the inner frame 20 sandwiched therebetween, the rib 42 protrudes into a gap G formed between each side portion 20a, 30a of the inner frame and the front frame. The structure which fits. That is, the extension piece 41 and the rib 42 integrally extending from the metal side plate 40 fixed to the outer frame 2 conceal one side portion 20a of the inner frame and close most of the gap G when each frame is closed.
On the other hand, the front frame 30 is a rib when it is in a closed position with respect to the outer frame 2 with the inner frame 20 interposed therebetween, as shown in FIGS. 1, 5 (b), 6, and 7 (c). The recesses 51 are fitted in close proximity to the front and rear surfaces and the front end of 42, and are separated from the ribs 42 when they are in the open position with respect to the outer frame as shown in FIGS. 5 (a) and 7 (a). The fraud prevention member 50 is provided.

In the present invention, the tamper-proof member 50 includes a recess 51 and a front extension piece 52 that extends forward from the front end 51 b of the recess 51. Further, the front extension piece 52 is integrated with the metal base 35 of the front frame 30. In this example, the front extension piece 52 is fixed to the metal base 35 by a fixing portion 33 such as a bolt.
For this reason, it is possible to integrate the front extension piece 52 integrated with the front end portion 51b of the recess 51 with the metal base 35 constituting the skeleton of the front frame 30 and remove the fraud prevention member 50 from the front frame using a bar or the like. It becomes difficult.
Furthermore, the outer side surface of the front extension piece 52 is covered with a side exterior member 36a formed by extending a part of the exterior member 36 covering the front surface of the metal base 35 of the front frame at the side end. . For this reason, when it is going to pry open the recessed part integrated with the metal base | substrate with a bar | burr etc., since it is necessary to damage an exterior member, the scar of fraudulent act can be left.
Further, when the front frame is closed as shown in FIG. 7C, the rear end portion of the side exterior member 36a protrudes rearward so as to close the gap G when the front frame is closed. Becomes an obstacle and it becomes difficult to insert the bar from the gap G. If you try to force the bar and insert it, the side exterior member will be damaged, so you can know that an illegal act has been performed.

Next, FIGS. 8A, 8 </ b> B, and 8 </ b> C are schematic views (planar cross-sectional views) showing a configuration of a locking portion having a fraud prevention structure according to another embodiment of the present invention.
In the fraud prevention structure according to the present invention, the inner angle θ of the portion 51d (the intersection of the rear locking piece 51a and the inner locking piece 51c) where the concave portion 51 of the fraud preventing member 50 is close to the tip of the rib 42 is an acute angle. In addition, the rear surface 51b of the front locking piece 51b is inclined from the front outer side toward the rear inner side. In other words, when the rib 42 is fitted in the recess 51, the inner angle θ of the recess adjacent to the tip of the rib is acute, and the rear surface 51b of the locking piece 51b is substantially parallel to the rear locking portion 51a. Therefore, when the rib 42 is fitted in the recess, the rib 42 is guided by the rear surface 51b and is deformed in the rearward direction so that the tip of the rib approaches the proximity portion 51d.
In accordance with the recess 51 having a substantially rhombus shape, the bending angle of the rib 42 with respect to the extension piece 41 is not an angle of 90 degrees but an acute angle. Therefore, as shown in FIG. 8C, when the rib 42 is fitted in the recess 51, the rib 42 and the rear surface 51b of the front locking piece are substantially parallel.
Therefore, when a bar or the like is inserted from the gap G1 between the rib 42 and the rear surface 51b of the front locking piece in a state where the front frame is closed, the rib 42 is deformed to further enter the recess 51. It becomes a bite, and it becomes more difficult to pry it open. Further, if the rib 42 bites into the recess 51, it becomes locked and it becomes difficult to open the front frame and a scar remains, so that it is possible to know that an illegal act has been performed.
Also in this example, the gap G may be closed by the side exterior member 36 a which is a part of the exterior member 36.

Furthermore, in the present invention, the protruding direction of the rib 42 is set so as to be a tangential direction D on the arcuate movement trajectory T of the recess 51 centered on the shaft support portions 3 and 4 and the upper and lower pins, By configuring the rib 42 and the recess 51 so as to mesh with each other on the tangent line of the arc, the direction of the rib and the tangent line become the same direction, and they are fitted in the same direction at the substantially tangential position.
That is, as shown in FIG. 6 and FIG. 7 in which the inner frame is omitted, the rib 42 has a configuration in which the front end edge of the extension piece 41 extending from the metal side plate 40 is bent inward, and the bending angle thereof is determined by the shaft support 3. 4, and the tangential direction D on the arcuate movement trajectory T of the recess 51 centered on the upper and lower pins. For this reason, when the front frame 30 is moved from the open position in FIG. 7A to the closed position in FIG. 7C through the intermediate position in FIG. 7B, the recess 51 provided in the fraud prevention member 50, particularly the rear portion of the recess. The locking piece 51a is configured to be elastically engaged with the rib 42 to increase the locking force.

Further, when the front frame 30 is closed with respect to the outer frame 2, there is a gap G (FIG. 7C) formed between the one side end 20a of the inner frame 20 and the one side end 30a of the front frame. A game ball in the game area that is closed by a rib 42 provided on the outer frame and a recess 51 that covers the front and rear surfaces and the tip of the rib, and a piano wire or a cell board is inserted into the gap G from the outside. And fraudulent actions against board parts cannot be performed. In other words, a U-shaped narrow path composed of ribs and recesses that are in close contact with each other is formed at the back of the gap G, but it is almost impossible to insert a piano wire or the like through this path.
That is, unlike conventional metal plates and ribs for preventing fraud, in the present invention, when the front frame 30 is closed with respect to the outer frame 2, the metal side plate 40 fixed to one side end 2a of the outer frame is used. Since the protruding direction is defined so that the extending rib 42 enters the gap G shown in FIG. 7 (c), it is possible to reliably prevent the insertion of a piano wire, a cell plate, or the like from the gap G in cooperation with the recess. it can.
That is, the conventional metal plates and ribs for preventing fraud are fixed to one side of the inner frame and the front frame, respectively, so that each frame is placed in the gap formed between the inner frame and the front frame. The fixing part with the metal plate or the like was in an exposed state. For this reason, if this exposed fixed part is destroyed with a tool such as a bar, it becomes possible to form a gap and insert an improperly implemented tool.

On the other hand, in the present invention, there is no metal plate or rib that can be removed by a bar or the like by being fixed to the inner frame in the first place, and the rib 42 extends from the metal side plate 40 fixed to the outer frame 2. In addition, the extension piece 41 and the rib 42 close the gap G between the inner frame and the front frame in a state in which the front frame is closed with respect to the outer frame with the inner frame interposed therebetween. The fixed part that can be removed from the frame is not exposed in the gap. Therefore, even if a bar or the like is inserted into the gap G from the outside, it is impossible to enter between the rib 42 and the recess 51 to further increase the distance between them or to destroy and remove one of them. Therefore, there is no room for forming a new gap for inserting a piano wire or the like, and illegal acts can be effectively prevented.
In addition, the protruding direction of the rib is set in the same direction as the tangent on the arc-shaped movement path of the concave portion at the closed position where the rib and the concave portion are engaged, so that the engagement between both is smoothly and firmly performed. Can do.

As described above, according to the present invention, when the front frame is closed with respect to the inner frame, the inner frame that is frequently opened and closed when it is installed in a game hall, and between the side edges of both frames when the front frame is closed with respect to the inner frame. It is difficult to break and remove the ribs when the ribs for filling the gaps are fixed to both frames in order to prevent cheating by inserting a fraudulent execution tool from the gaps formed in the game area. To prevent fraud.
That is, while the front frame 30 that is frequently opened and closed with respect to the inner frame 20 needs to be opened and closed smoothly, it forms a gap (a gap communicating with the game area) to prevent intrusion by the cheating execution tool. There is a request not to want. Conventionally, in order to fill the gap formed in the hinge part of the inner frame and the front frame, when a rib or the like for preventing intrusion is provided in both frames, a fixing part such as a rib is exposed from the gap, so a bar or the like is used. If this was removed, it was possible to form a gap for entry. In the present invention, the rib 42 formed by extending the metal side plate 40 fixed to the one end portion 2a of the outer frame 2 forward is used instead of disposing the intrusion prevention member at the one end portion 20a of the inner frame. The rib is configured to be inserted into a gap G between the front frame and the front frame so that the rib can be surrounded by a recess 51 provided at one end of the front frame.

Further, the concave portion 51 of the fraud prevention member makes the inner angle θ of the portion 51d adjacent to the tip of the rib 42 acute, and the rear surface 51b of the front locking piece is inclined from the front outer side toward the rear inner side. . Further, the bending angle of the rib 42 is an acute angle. For this reason, when the rib 42 is fitted in the recess 51, the rib 42 and the rear surface 51b of the front locking piece are substantially parallel. Therefore, when the front frame is closed, when the bar 42 or the like is inserted between the rib 42 and the rear surface 51b of the front locking piece from the gap G1 and is to be pry open, the rib 42 is deformed and further penetrates into the recess 51. This makes it more difficult to pry.
Further, the rib and the recess are engaged with each other on a tangent line on the arc-shaped movement locus of the recess. That is, since the protruding direction and the tangent of the rib are oriented in the same direction, the rib and the recess are fitted in the same direction at the substantially tangential position. For this reason, even if a bar or the like is inserted from the gap, the metal side plate cannot be broken and removed, and the engagement between the rib and the recess is smooth even if frequent opening and closing is performed.
In addition, when the metal side plate is configured as a part of the outer frame (when it is not retrofitted with a bolt or the like), it is extremely difficult to perform an illegal act by removing the metal side plate itself.

DESCRIPTION OF SYMBOLS 1 ... Pachinko machine, 2 ... Outer frame, 2a ... One side end, 3 ... Shaft support part, 3a ... Notch part, 4 ... Shaft support part, 4a ... Shaft hole, 20 ... Inner frame, 20a ... One side end (one Side portions), 21, 22 ... pivoted support portion, 21a ... shaft hole, 22a ... shaft hole, 30 ... front frame, 30a ... one side end, 31 ... pivoted support portion, 32 ... pivoted support portion, 36 ... exterior member, 36a ... side exterior member, 40 ... metal side plate, 41 ... extension piece, 42 ... rib, 50 ... fraud prevention member, 51 ... recess, 51a ... rear locking piece, 51b ... front locking piece, 51b collar ... rear surface 51c ... inner locking piece, 51d ... proximal portion, 52 ... front extension piece

Claims (5)

An outer frame having a shaft support on one side, an inner frame that supports the game board and is pivotally supported on one side by the shaft support, and a transparent plate that covers the front of the game board And a pachinko gaming machine comprising a front frame that is pivotally supported by the pivotal support so that one side is rotatable,
A side plate fixed to one side of the outer frame or integrated in advance,
The metal side plate includes an extension piece that protrudes forward beyond the front surface of the outer frame, and a rib that is bent inward at a front end edge of the extension piece,
The rib fits into a gap formed between the inner frame and each side portion of the front frame when the front frame is closed with respect to the outer frame with the inner frame sandwiched therebetween. With configuration,
The front frame has a recess that fits in close proximity to the rib when in the closed position with respect to the outer frame, and has a recess that separates from the rib when in the open position with respect to the outer frame. Comprising a member,
The fraud prevention structure for a pachinko gaming machine, wherein the fraud prevention member includes the recess and a front extension piece extending forward from the recess. 2. A fraud prevention structure for a pachinko gaming machine according to claim 1, wherein a front portion of the front extension piece is integrated with a metal base constituting the front frame. The pachinko gaming machine fraud prevention structure according to claim 1 or 2, wherein an outer surface of the front extension piece is covered with a part of an exterior member that covers an outer surface of a metal base of the front frame. . The structure for preventing fraud in pachinko gaming machines according to claim 3, wherein a part of the exterior member closes the gap when the front frame is closed. The fraudulent act of the pachinko gaming machine according to any one of claims 1 to 4, wherein when the rib is fitted into the recess, the inner angle of the recess adjacent to the tip of the rib is an acute angle. Prevention structure.

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