JP7313012B2 - Game machine island stand - Google Patents

Description

TECHNICAL FIELD The present invention relates to a game machine island provided with a heating panel for warming the feet of a player.

In the hall of a pachinko/pachislot parlor, a plurality of structures called gaming machine islands are arranged in which a plurality of gaming machines such as pachinko or pachislot machines are installed. The game machine island is formed by fixing a top plate on which a plurality of game machines are arranged side by side to a three-dimensionally assembled frame, a waist plate extending vertically under the feet of the player under the top plate, and the like, and having a storage space for a collecting device for collecting pachinko balls and coins on the back of the waist plate (see, for example, Patent Document 1). In many cases, the waist plate is detachably fixed to the frame, and when performing maintenance of the recovery device, the worker can access the storage space by removing the waist plate from the frame.

By the way, in the hall, for example, the seats near the doorway to the outside may feel cold in winter due to the outside air entering when the customers come and go. Therefore, there is a game machine island stand in which a heating device is installed at the feet of the player in such a seat so as to keep them warm. For example, a heating panel as disclosed in Patent Document 2 can be installed without interfering with the feet of the player by attaching it to the waist plate of the game machine island.

Japanese Patent No. 5942379 (page 4, FIG. 1) Utility model registration No. 3120291 (page 5, Figure 3)

As in Patent Literature 1, a plurality of wainscots are connected and fixed to a frame so as to facilitate maintenance work as described above. However, these wainscots are attached to cover the accommodation space, and are not arranged at dimensions and positions that correspond particularly to the gaming machines and seats on the top plate. Therefore, if the heat generating panel is arranged at a position corresponding to the seat, the heat generating panel may straddle the joint between the adjacent wainscots. If the heat-generating panel is attached across the joint between the adjacent wainscots in this way, the heat-generating panel interferes when the wainscot is removed. Therefore, if workability of maintenance work is prioritized, the heat-generating panel must be arranged so as to fit within the width of the wainscot, and there is a risk that the heat-generating panel cannot be arranged at a position that corresponds appropriately to the seat.

SUMMARY OF THE INVENTION The present invention has been made by paying attention to such problems, and an object thereof is to provide a game machine island stand in which a waist plate can be easily attached and detached while a heating panel for warming the feet of a player is attached at a position appropriately corresponding to an arbitrary seat.

In order to solve the above problems, the gaming machine island of the present invention includes:
A top plate on which a plurality of game machines such as pachinko machines and pachislot machines are arranged side by side is attached to a three-dimensionally assembled frame, and a plurality of vertically extending waist plates are attached below the top plate.
The waist plate is detachably supported with respect to the frame,
A locking portion having an opening that opens downward is provided on the upper surface of the waist plate, and a locking portion that has an opening that opens upward is provided on the lower surface of the waist plate in parallel across the width direction of the waist plate.
The engaging portion is provided so as to be accommodated within the width of the wainscot.
According to this feature, since the locking portion that supports the heating panel is provided across the width direction of the wainscot, the locking portions of the adjacent wainscots are continuous with each other, and the heating panel can be installed at any position within the width of the wainscot or straddling the joint between the adjacent wainscots, for example, at a position appropriately corresponding to an arbitrary seat. In addition, since the heat generating panel is detachably supported between the openings of the upper and lower engaging portions, and the engaging portion is provided so as to fit within the width of the wainscot, the engaging portions of the adjacent wainscot do not interfere when the wainscot is removed during maintenance of the collecting device.

The engaging portion having a downwardly opening opening provided on the upper surface of the wainscot is characterized in that a front plate portion constituting the opening is supported so as to be rotatable in the front-rear direction, and is urged toward the surface of the wainscot.
According to this feature, the heat generating panel can be sandwiched between the plate portion on the front surface of the locking portion and the surface of the waist plate, so that the heat generating panel is prevented from rattling and can be supported stably, and the movement of the heat generating panel in the left and right direction can be restricted. Further, by rotating the plate portion on the front surface of the locking portion forward, the restriction on the lateral movement of the heat generating panel can be released, making it easy to adjust the position of the heat generating panel in the lateral direction.

It is characterized in that a cushioning member having a shape along the opening is arranged in the opening of the engaging portion.
According to this feature, since the buffer member is interposed between the opening and the heat generating panel, the vibration of the waist plate during operation of the game machine or the collection device is hardly transmitted to the heat generating panel, and damage and noise due to resonance between the heat generating panel and the locking portion can be suppressed.

The locking portion is characterized by having a mounting portion to which a restricting member that is inserted into the opening from the outside and restricts lateral movement of the heat generating panel is detachably attached.
According to this feature, the restricting member can restrict the lateral movement of the heat generating panel, and the restricting member can be removed when the heat generating panel is not in use.

A cushioning member is interposed between the attached portion and the restricting member.
According to this feature, it is possible to suppress the resonance between the regulating member and the attached portion caused by the vibration of the wainscot when the game machine or the recovery device is in operation, thereby suppressing damage and noise.

The engaging portions are characterized in that they are formed so as to extend continuously to both ends in the width direction of the waist plate.
According to this feature, it is possible to produce continuity between the engaging portions of the adjacent waist plates, which is excellent in appearance.

A plurality of the locking portions are arranged with respect to one waist plate and are provided across the width direction of the waist plate, and adjacent locking portions are laterally spaced apart by a distance smaller than the lateral width of the heat generating panel.
According to this feature, the heating panel can be reliably supported between the adjacent locking portions, and the area occupied by the locking portions on the waist plate can be made smaller, so that it does not become an obstacle at the feet of the player.

A rail member having an opening that opens downward and a rail member having an opening that opens upward at the lower surface of the waist plate are fixed in parallel to the frame, respectively, and the waist plate can be detachably supported between the openings of the rail members facing each other in the vertical direction.
According to this feature, since the wainscot is supported vertically, it can be arranged at any position within the lateral dimension of the rail member regardless of the lateral dimension of the wainscot, and the wainscot with the locking portion can be moved to any position to change the installation position of the heating panel.

1 is a front view showing a gaming machine island in Embodiment 1 of the present invention; FIG. FIG. 3 is a perspective view showing a frame constituting a gaming machine island; It is a sectional side view which shows the attachment structure of a waist board. It is a sectional side view which shows the accommodation space regulated by the back side of a wainscot. FIG. 4 is a perspective view showing a wainscot and a heating panel; Fig. 10 is a side cross-sectional view showing a mounting structure of the heating panel to the wainscot. FIG. 4 is a front view showing a state in which the heat generating panel is arranged at a position corresponding to the gaming machine; FIG. 10 is a perspective view showing a cap that restricts lateral movement of the heating panel; (a) is a front view before changing the layout pattern of the wainscot, and (b) is a front view after changing the layout pattern of the wainscot. FIG. 11 is a perspective view showing a waist plate that constitutes the gaming machine island in Embodiment 2 of the present invention; FIG. 11 is a perspective view showing a waist plate that constitutes a gaming machine island in Embodiment 3 of the present invention; Fig. 10 is a side cross-sectional view showing a mounting structure of a heating panel to a waist plate according to Embodiment 3 of the present invention;

A mode for carrying out the gaming machine island according to the present invention will be described below based on an embodiment.

The gaming machine island according to the first embodiment will be described with reference to FIGS. 1 to 9. FIG. Hereinafter, the front side of the paper surface of FIG. 1 is defined as the front side (front side) of the game machine island, the horizontal direction thereof is defined as the left and right sides, and the left side of the paper surface of FIG. 5 is defined as the front side (front side) of the game machine island.

FIG. 1 shows a part of a game machine island stand, which is installed in a hall of a pachinko/pachislot parlor, on which a plurality of game machines M such as pachinko or pachislot machines are installed. As shown in FIG. 2, the gaming machine island 1 is formed with a top plate 3 on which a plurality of gaming machines M are arranged side by side in front of and behind a three-dimensionally assembled frame 2, waist plates 4 (4A to 4C) extending toward the feet of the player below the top plate 3, and the like, and a housing space S (see FIG. 4) in which various devices such as a circulation mechanism of a collecting device for collecting pachinko balls and coins are housed. Incidentally, the game machine island stand arranged along the wall of the store has the top plate 3 and the waist plate 4 fixed only on the front surface.

The frame body 2 is mainly composed of a plurality of vertical frames 6 that stand apart from each other on the floor surface, and horizontal frames 7 that connect the vertical frames 6 together in the horizontal direction. The vertical frame 6 is formed in the shape of a ladder by connecting metal square tubes 6a and 6b spaced apart in the front-rear direction by connecting rods 9, and legs 8 fixed to the floor are fixed to the lower ends of the square tubes 6a and 6b.

A first horizontal frame 7A and a second horizontal frame 7B extending parallel to each other are fixed to the upper end of the vertical frame 6, a third horizontal frame 7C is fixed below the top plate 3 fixed to the vertical frame 6, and a fourth horizontal frame 7D is fixed to the lower end of the vertical frame 6. - 特許庁

The first horizontal frame 7A, the second horizontal frame 7B, the third horizontal frame 7C, and the fourth horizontal frame 7D extend in parallel across the adjacent vertical frames 6,6. A data counter is installed between the first horizontal frame 7A and the second horizontal frame 7B.

As shown in FIG. 3, a rail member 10 having a downward opening 10a is fixed to the front surface 71 of the third horizontal frame 7C, and a rail member 11 having an upward opening 11a is fixed to the front surface 72 of the fourth horizontal frame 7D. These rail members 10 and 11 extend parallel to each other over the longitudinal direction of the third horizontal frame 7C and the fourth horizontal frame 7D. The wainscot 4 is detachably supported between the openings 10a and 11a of the rail members 10 and 11 facing each other vertically in a Kendon manner.

A plurality of wainscots 4 are connected without gaps in the longitudinal direction of the frame body 2, and the maintenance work of the circulation mechanism of the recovery device accommodated in the accommodation space S is facilitated by removing only the wainscots 4 at the necessary locations. However, these wainscots 4 are attached to cover the housing space S of the game machine island 1 which is formed to have the necessary dimensions according to the layout of the store, and the dimensions in the horizontal direction are not formed according to the same standard, and they are not arranged at the position of the game machine M on the top plate 3, that is, the size and position particularly corresponding to the seats. For example, as shown in FIG. 7, the waist plate 4A has a dimension from the left-right end of the game machine M1 to the left-right center of the game machine M2, the waist plate 4B has a dimension from the left-right center of the game machine M2 to the right-left end of the game machine M4, and the waist plate 4C has a dimension from both left-right ends of the game machine M5.

Next, the waist plate 4 will be described. Here, the wainscot 4A is taken as an example for explanation, and the wainscot 4B and the wainscot 4C, which have the same structure except for the dimension in the width direction, will not be explained. As shown in FIGS. 3 to 6, the wainscot 4A is constructed by putting a decorative sheet on the surface of a rectangular piece of wood having a uniform plate thickness. The thickness of the wainscot panel 4A is formed slightly thinner than the inner dimensions in the longitudinal direction of the openings 10a and 11a of the rail members 10 and 11 fixed to the third horizontal frame 7C and the fourth horizontal frame 7D.

The locking member 12 provided on the upper surface 40 of the wainscot 4A has an opening 12a that extends continuously to both ends in the width direction of the wainscot 4A, has a horizontal dimension, has a uniform cross-sectional shape, and opens downward. The locking member 13 provided below the surface 40 of the wainscot 4A has an opening 13a that extends continuously to both ends in the width direction of the wainscot 4A, has a horizontal dimension, has a uniform cross-sectional shape, and opens upward. Buffer members 14 and 15 shaped along the inner surfaces of the openings 12a and 13a are arranged in the openings 12a and 13a of the locking members 12 and 13, respectively.

As shown in FIGS. 5 and 6, the waist plate 4A is formed with a hole 41 passing therethrough in the front-rear direction, and the socket 16 is inserted through the hole 41. As shown in FIG. The socket 16 is made of synthetic resin or the like and has a hollow portion 16a. A hole 41 formed in the wainscot panel 4A is formed to have a size through which the plug 21 of the heating panel 20 can be inserted. The socket 16 has a shape split in half in the front-rear direction, and after the plug 21 of the heating panel 20 is passed through the hole 41 of the waist plate 4A, the socket 16 is installed so as to sandwich the power cable 22 of the heating panel 20, thereby suppressing the fluttering of the power cable 22 and making the hole 41 of the waist plate 4A inconspicuous.

The heat generating panel 20 includes a heat generating film (not shown) that generates heat by electric power supplied through a plug 21 and a power cable 22. The heat generating film is sandwiched between heat insulating boards and heat resistant boards, and a decorative sheet is attached to the surface layer.

As shown in FIGS. 5 and 6, the heating panel 20 can be attached and detached between the openings 12a and 13a of the locking members 12 and 13 facing each other vertically in a Kendon manner. Specifically, after the upper end side of the heating panel 20 is obliquely inserted into the opening 12a of the upper locking member 12, the lower end side of the heating panel 20 is inserted into the opening 13a of the lower locking member 13, and the heating panel 20 is vertically lowered and placed on the lower locking member 13. Since the heating panel 20 is placed on the locking member 13 on the lower side in this way, most of the load is supported by the locking member 13 on the lower side, and the upper end side of the heating panel 20 is rested on the locking member 12 on the upper side to restrict the tilting thereof. Since the locking members 12 and 13 extend in the horizontal direction of the waist plate 4, the installation position of the heating panel 20 can be freely selected in the horizontal direction of the locking members 12 and 13. As shown in FIG.

Moreover, when the heating panel 20 is attached, the cushioning members 14 and 15 are compressed between the openings 12a and 13a and the upper and lower ends of the heating panel 20, thereby preventing the heating panel 20 from rattling.

As shown in FIG. 6, the waist plate 4A extends from the left-right end of the game machine M1 to the center of the game machine M2 in the left-right direction, the waist plate 4B extends from the center of the left-right direction of the game machine M2 to the right end of the game machine M4 in the left-right direction, and the waist plate 4C extends across both left-right ends of the game machine M5. The wainscots 4A, 4B are seats near the entrance to the outdoors, correspond to the game machines M1, M2, M3 which are cooled by the outside air entering and exiting when the customers enter and exit, and can warm the feet of the players by setting the heating panels 20. - 特許庁When the heat generating panels 20A, 20B and 20C are attached to the positions appropriately corresponding to the feet of the game machines M1, M2 and M3, respectively, the heat generating panel 20A is arranged on the wainscot 4A, the heat generating panel 20B straddles the wainscot 4A and 4B, and the heat generating panel 20C is arranged on the wainscot 4B.

As shown in FIG. 8, a cap 23, which is a restricting member, can be detachably attached to the opening 13a of the locking member 13 on the lower side. The cap 23 is made of elastically deformable synthetic resin, and can be attached to the opening 13a (attached portion) while compressing the cushioning member 15 . At this time, the force of recovery from the elastic deformation of the cap 23 and the force of recovery from the deformation of the cushioning member 15 generate a frictional force between the cushioning member 15 and the cap 23, which restricts the lateral movement of the cap 23 within the opening 13a of the locking member 13. This cap 23 is also attached to the opening 12a of the upper engaging member 12. As shown in FIG. By attaching caps 23 to the openings 12a and 13a of the locking members 12 and 13 on the left and right sides of the heating panel 20 mounted between the upper and lower locking members 12 and 13, the movement of the heating panel 20 in the left and right direction can be restricted. Moreover, since the cap 23 can be removed when the heating panel 20 is not in use, the appearance is excellent. Furthermore, since buffer members 14 and 15 are interposed between the openings 12a and 13a and the cap 23, resonance between the cap 23 and the openings 12a and 13a caused by vibration of the waist plate 4 during operation of the game machine M and the recovery device can be suppressed, and damage and noise can be suppressed.

As described above, in the game machine island 1, the locking member 12 having the opening 12a opening downward above the surface 40 of the waist plates 4A, 4B, and 4C detachably fixed to the frame 2, and the locking member 13 having the opening 13a opening upward below the surface 40 of the waist plate 4 are provided in parallel across the width of the waist plate 4 at the same height. The heating panel 20 can be detachably supported between the openings 12a and 13a. Therefore, the locking members 12 and 13 of the adjacent wainscots 4 are continuous with each other, and the heating panel 20 can be installed even at a position straddling the joint of the adjacent wainscots 4 . That is, it can be installed at a position appropriately corresponding to any seat. Further, the locking members 12 and 13 are provided so as to fit within the width of the waist plate 4, and are detachably supported between the openings 12a and 13a of the upper and lower locking members 12 and 13. Therefore, when the waist plate 4 is removed for maintenance of the recovery device, the locking members 12 and 13 of the adjacent waist plates 4 do not interfere with each other.

Further, by interposing the buffer members 14, 15 between the openings 12a, 13a of the locking members 12, 13 and the heating panel 20, the vibration of the waist plate 4 during operation of the circulation mechanism of the game machine M and the recovery device is hardly transmitted to the heating panel 20, and damage and noise due to resonance between the heating panel 20 and the locking members 12, 13 can be suppressed.

Further, since the locking members 12 and 13 in this embodiment are formed to extend continuously to both ends in the width direction of the wainscot 4, continuity can be produced between the locking members 12 and 13 of the adjacent wainscots 4, and the appearance is excellent.

In addition, since the wainscot 4 is detachably supported between the openings 10a and 11a of the rail members 10 and 11 which are fixed to the frame 2 and face each other in the vertical direction, the wainscot 4 can be freely arranged within the lateral dimension of the rail members 10 and 11 regardless of the lateral dimension of the wainscot 4 as shown in FIG. The degree of freedom in changing the installation position of the heating panel 20 can be increased.

In addition, since the heating panel 20 is placed on the locking member 13 on the lower side and most of the load is supported by the locking member 13 on the lower side, the warp deformation of the waist plate 4 can be effectively suppressed as compared with the case where the load is supported on the upper end side of the waist plate 4.

The heating panel 20 is supported by a Kendon type mounting method between locking members 12 and 13 fixed to the waist plate 4 and opposed to each other in the vertical direction, and the waist plate 4 is similarly supported by a Kendon type mounting method between rail members 10 and 11 fixed to the frame body 2 and opposed to each other in the vertical direction. In this way, by adopting the Kendon type mounting method, when removing the wainscot 4 or the heat generating panel 20, it is necessary to once lift it upward and then pull the lower side toward you, so that the wainscot 4 and the heat generating panel 20 can be prevented from coming off when the player's feet come into contact with them.

Next, the game island machine according to the second embodiment will be described with reference to FIG. It should be noted that the description of the configuration that is the same as that of the above-described embodiment and overlaps will be omitted.

In the wainscot 34 of this embodiment, a plurality of locking members 32 and 33 are arranged for one wainscot 34 and are provided across the width direction of the wainscot 34, and the adjacent locking members 32 and 33 are horizontally spaced apart by a distance smaller than the left-right width of the heat generating panel 20. Also, the distance between the engaging members 32 and 33 at both ends of the wainscot 34 and the engaging members 32 and 33 at the ends of the wainscot 34 adjacent to each other on the left and right sides is set to be smaller than the lateral width of the heating panel 20 . According to this, the heating panel 20 can be surely supported in the wainscot 34 or between the adjacent locking members 32, 33 across the adjacent wainscots 34, and the area occupied by the locking members 32, 33 in the wainscot 34 can be reduced in size, so that it does not become an obstacle at the feet of the player. In addition, in places where the heat generating panel 20 is not installed, dust and the like are less likely to accumulate particularly on the lower locking member 33, and the appearance is excellent.

Next, a game island machine according to the second embodiment will be described with reference to FIGS. 11 and 12. FIG. It should be noted that the description of the configuration that is the same as that of the above-described embodiment and overlaps will be omitted.

The wainscot 44 in this embodiment is provided with a locking member 42 that opens downward and a locking member 13 that opens upward. A plurality of locking members 42 that open downward are arranged for one wainscot 44 and are provided across the width direction of the wainscot 44. Also, the distance between the locking members 42 at both ends of the waist plate 44 and the locking members 42 at the ends of the left and right adjacent waist plates 44 is also set to be a distance smaller than the left-right width of the heat generating panel 20. - 特許庁

The locking member 42 is composed of an inverted L-shaped base member 43 fixed to the waist plate, a hinge 45 fixed to a forwardly extending piece of the base member 43, and a plate portion 46 fixed to the hinge 45 and provided to be rotatable back and forth with respect to the base member 43. The plate portion 46 constitutes the front surface of the opening 42a of the locking member 42, and is biased toward the surface 40 of the waist plate 44 by a coil spring 48, which is biasing means of the hinge 45. It is In addition, a plurality of semicircular notches 47 are formed in the base member 43, and the wiring of the heating panel 20 can be passed by arranging the locking member 42 so that one of them corresponds to the hole 41 formed in the waist plate 44. - 特許庁These cutouts 47 can be covered with the plate portion 46 and are excellent in appearance.

According to this, the heat generating panel 20 can be sandwiched between the plate portion 46 on the front surface of the locking member 42 and the surface 40 of the waist plate 44, so that the heat generating panel 20 is prevented from rattling forward and can be stably supported, and the lateral movement of the heat generating panel 20 can be restricted. Further, by rotating the plate portion 46 on the front surface of the locking member 42 forward, the restriction on the lateral movement of the heat generating panel 20 can be released, and the position of the heat generating panel 20 in the lateral direction can be easily adjusted.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions within the scope of the present invention are included in the present invention.

For example, in the above-described embodiment, the adjacent heat generating panels 20 are shown spaced apart in the left-right direction, but the heat-generating panels 20 are not limited to this, and may be connected in the left-right direction.

Further, the upper and lower locking members 12 and 13 fixed to the waist plate 4 can reduce the manufacturing cost by using members of the same type vertically symmetrically, but they may have different shapes.

Further, the wainscot 4 is not limited to a shape having vertical dimensions extending from below the top plate 3 to the floor surface or to the vicinity of the floor surface. Furthermore, the wainscot 4 may be formed into an inclined surface that recedes as it goes downward.

Further, in the above-described embodiment, the waist plate 4 and the locking members 12 and 13 have been described as separate members.

In the above-described embodiment, the heating panel 20 is attached and detached between the openings 12a and 13a of the upper and lower locking members 12 and 13 in a Kendon manner. The distance between the bottom surfaces of 2a and 13a and the vertical dimension of heat generating panel 20 may be substantially the same, and cushioning members 14 and 15 may be minimized or omitted.

Further, the structure of the locking member for fixing the heat generating panel 20 to the waist plate 4 is not limited to the rail shape as in the above embodiment, as long as the openings face each other vertically and the structure is detachable.

1 Game machine island base 2 Frame body 3 Top plate 4 (4A to C) Waist plate 6 Vertical frame 7 (7A to D) Horizontal frame 10 Rail member 10a Opening 11 Rail member 11a Opening 12 Locking member (locking portion)
12a opening 13 locking member (locking portion)
13a opening 14 cushioning member 15 cushioning member 16 socket 20 (20A to C) heating panel 21 plug 22 power cable 23 cap (regulating member)
32, 33 locking member (locking portion)
34 Waist plate 40 Waist plate surface 41 Waist plate hole 42 Locking member (locking portion)
44 waist plate M (M1-5) game machine S accommodation space

Claims (8)

A top plate on which a plurality of game machines such as pachinko machines and pachislot machines are arranged side by side is attached to a three-dimensionally assembled frame, and a plurality of vertically extending waist plates are attached below the top plate.
The waist plate is detachably supported with respect to the frame,
A locking portion having an opening that opens downward is provided on the upper surface of the waist plate, and a locking portion that has an opening that opens upward is provided on the lower surface of the waist plate in parallel across the width direction of the waist plate.
The game machine island stand, wherein the engaging portion is provided so as to be accommodated within the width of the waist plate. 2. The game machine island stand according to claim 1, wherein the engaging portion having a downwardly opening opening provided in the upper surface of the wainscot is supported so that a front plate portion constituting the opening is rotatable in the front-rear direction and biased toward the surface of the wainscot. 3. The game machine island stand according to claim 1, wherein a cushioning member having a shape along the opening is arranged in the opening of the engaging portion. 4. The game machine island stand according to claim 1, wherein the engaging portion includes a mounting portion for detachably mounting a restricting member that is inserted into the opening from the outside and restricts lateral movement of the heating panel. 5. The game machine island stand according to claim 4, wherein a cushioning member is interposed between said attached portion and said restricting member. 6. The game machine island stand according to any one of claims 1 to 5, wherein the locking portion is formed so as to extend continuously to both ends of the waist plate in the width direction. 7. The game machine island stand according to any one of claims 1 to 6, wherein a plurality of said engaging portions are arranged for one said wainscot and are provided across the width direction of said wainscot, and adjacent engaging portions are laterally spaced apart by a distance smaller than the lateral width of said heating panel. 8. The game machine island stand according to any one of claims 1 to 7, wherein a rail member having an opening that opens downward and a rail member having an opening that opens upward to the lower surface of the waist plate are fixed in parallel to the frame, respectively, so that the waist plate can be detachably supported between the openings of the rail members facing each other vertically.

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