JP2010004958A - Nail for pinball game machine and panel for pinball game machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nail for a pinball game machine, which can achieve the strength with which the nail is sufficiently fixed even to a thin panel with holes previously formed, prevented from loosening or coming off when an external force is applied, hardly broken, small in variation in flexural life and can be bent in a desired direction to facilitate nail adjustment; and to provide a panel for the pinball game machine using the nail. <P>SOLUTION: The nail includes a head part and a shank part, wherein the shank part is hammered in the panel. The shank part is provided with a non-screw part without a screw on a base end side and a screw part where a screw is formed on an outer peripheral face on the point side, wherein the number of thread ridges of the screw part is 6 or more. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a ball game machine nail used for forming a flow path of a game ball and attaching an accessory in a ball game machine such as a pachinko machine, and a ball game machine panel using the nail.

In a ball game machine such as a pachinko machine, a large number of nails are placed on the surface of the panel in order to form a flow path of the game ball or to attach an accessory such as a windmill.
Such a nail for a ball game machine has a spiral portion on the outer peripheral surface on the front end side, and is fixed to the panel by inserting the spiral portion into a hole formed in the panel in advance (for example, See Patent Document 1 below). In addition, the number of ridges of a spiral part is 4 (for example, refer the following patent document 2).
The hole in the panel is smaller than the spiral part. When a nail having a spiral part is driven into the hole in the panel, the nail itself rotates and the spiral part is inserted into the hole, thereby fixing the nail to the panel. Strength is secured.

  However, since the conventional nail for a ball game machine as described above has only four ridges that bite into the periphery of the hole in the panel, sufficient fixing strength to the panel can be obtained when the panel is thin. I can't. For this reason, there is a risk of loosening or disengagement when subjected to an external force such as a game ball collision or a hammer hitting when adjusting a nail.

Further, when nailing the nail into the panel hole, it is impossible to make the circumferential direction of the nail constant, so that the position of the ridge that bites into the peripheral edge of the panel hole by the nail varies. Therefore, the positional relationship between the direction in which the external force is applied and the ridges that bite into the periphery of the hole in the panel is not constant but random.
Under these circumstances, if the number of ridges that bite into the panel holes is small (if there are only 4 ridges) like a conventional nail, the position of the ridges is aligned with the direction of the external force when an external force is applied. There is a high possibility that it will not be symmetric.
Therefore, when an external force is applied, there is a problem that the nail is easily loosened due to a torque acting to rotate the nail. Further, since it is difficult to bend in the direction to be bent, there is a problem that it is difficult to adjust the nail.

Further, the external force acting on the nail tends to concentrate on the boundary portion between the spiral portion and the non-spiral portion, and the conventional nail has a problem that it easily breaks at this boundary portion.
This is because, in the conventional nail having four spirals, the cross section of the spiral portion is substantially square, whereas the cross section of the non-spiral portion is circular, and the cross-sectional coefficients of the spiral portion and the non-spiral portion are greatly different. It is due to that.
In addition, since the cross section of the spiral portion is substantially square, the difference between the section modulus with respect to the force in the opposite direction and the section coefficient with respect to the force in the diagonal direction also increases. That is, it is weak against the external force in the diagonal direction and strong against the external force in the opposite direction. However, as described above, it is impossible to make the direction of the nail circumferentially constant when driving the nail into the hole of the panel, so the nail and the diagonal that receive a large amount of external force in the opposite direction to one panel. Nail which receives a lot of external force in the direction will be mixed.
Therefore, there was a great variation in the bending life due to the nails in one panel. In addition, the ease of bending greatly varies depending on the direction of the external force, making it difficult to adjust the nail.

JP 2005-204862 A Design Registration No. 1318033

  The present invention has been made to solve the above-mentioned problems of the prior art, and can obtain a sufficient fixing strength even for a thin panel in which holes are formed in advance, and loosens when an external force is applied. A nail for a ball game machine that does not slip out, is not easily broken, has a small variation in its folding life, can be easily bent in a desired direction, and can be adjusted easily. A panel for a ball game machine using the

  The invention according to claim 1 is a ball game machine nail comprising a head portion and a shaft portion, the shaft portion being driven on a panel of the ball game machine, wherein the shaft portion is on the proximal side. A non-spiral portion having no spiral and a spiral portion having a spiral formed on the outer peripheral surface on the tip side, and the number of ridges of the spiral portion is 6 or more. Related to nails.

  The invention according to claim 2 relates to the nail for a ball game machine according to claim 1, wherein the number of ridges of the spiral portion is an even number.

  The invention according to claim 3 relates to a nail for a ball game machine according to claim 2, wherein the number of ridges of the spiral portion is eight.

  The invention according to claim 4 relates to a nail for a ball game machine according to any one of claims 1 to 3, wherein a plurality of V-shaped cuts are formed in the ridges of the spiral portion.

  The invention according to claim 5 is characterized in that the angle formed by the inclined portion of the V-shaped cut with the ridge line of the ridge is smaller on the distal end side of the shaft portion than on the proximal end side of the shaft portion. It relates to nails for ball game machines.

  The invention according to claim 6 is the ball game machine according to claim 4 or 5, wherein the valley line of the V-shaped cut extends in a direction substantially perpendicular to the spiral direction of the spiral portion. Related to nails.

  In the invention according to claim 7, a tapered portion that gradually decreases in diameter is formed at the tip of the shaft portion, and a cylindrical portion without a spiral is formed between the tapered portion and the helical portion. 7. The ball game machine nail according to claim 1, wherein the outer diameter is the same as or slightly smaller than the outer diameter of the non-spiral portion.

  The invention according to claim 8 is a panel on which the nail for a ball game machine according to claim 7 is placed, which is made of resin, and a hole for placing the nail is formed in advance. And the diameter of the hole is the same as or slightly smaller than the outer diameter of the non-spiral portion and smaller than the outer diameter of the spiral portion.

According to the invention according to claim 1, since the number of ridges of the spiral portion is 6 or more, even when an external force is applied to the nail from any direction, it is almost always received by the 3 or more spiral portions. Can do. Therefore, sufficient fixing strength can be obtained even for a thin panel in which holes are formed in advance, and it will not loosen or come off when an external force is applied.
In addition, no matter what direction external force is applied, the position of the ridge is line symmetric or nearly line symmetric with the external force vector as the center line, so that when applying external force, torque is applied to rotate the nail. The nails are difficult to loosen. Furthermore, when trying to bend the nail, the ridges are positioned in line symmetry or substantially line symmetry with the bending force vector as the center line, so the nail is easy to bend and the nail is easy to adjust. Become.
Furthermore, the difference in the section modulus between the spiral portion and the non-spiral portion is reduced, and the difference between the section modulus with respect to the force in the opposite direction and the sectional modulus with respect to the force in the diagonal direction is also reduced, so that the bending life and the variation in the bending life are also reduced. Get smaller. Further, since the ease of bending does not vary greatly depending on the direction of the external force, the nail can be easily adjusted.

  According to the second aspect of the present invention, when the number of ridges in the spiral portion is an even number, when an external force is applied to the nail, if the compressive force acts on the corner of the spiral portion (the top of the ridge), the tensile force is also angular. When the compression force acts on the sides of the spiral portion (between the ridges of the ridges), the tensile force also acts on the sides, that is, the compression side and the tension side are likely to have the same shape. . Therefore, the nail is easily bent in the direction of the external force, and the nail adjustment can be easily performed.

According to the invention of claim 3, since the number of ridges of the spiral portion is 8, even when an external force acts on the nail from any direction, it can be received almost always by the 4 spiral portions. . Therefore, sufficient fixing strength can be obtained even for a thin panel in which holes are formed in advance, and it will not loosen or come off when an external force is applied.
Further, since the spiral portion has an even number of ridges and the cross-sectional shape is close to a circle, it is easy to bend in any direction, and nail adjustment can be easily performed.
Furthermore, the difference in section modulus between the spiral portion and the non-helical portion is very small, and the difference between the section modulus with respect to the force in the opposite direction and the section modulus with respect to the force in the diagonal direction is also very small. It increases, and the variation of the bending life becomes very small. Further, since the difference in the ease of bending depending on the direction of the external force is reduced, the nail can be easily adjusted.
Further, the driving load does not become excessively high.

  According to the invention which concerns on Claim 4, since the several V-shaped notch is formed in the thread | yarn of a spiral part, the material of the panel which entered the notch at the time of placing in a panel becomes resistance with respect to extraction. The pull-out strength is increased, and the fixing strength to the panel against external force is improved.

  According to the fifth aspect of the invention, the angle formed by the inclined portion of the V-shaped cut with the ridge line of the ridge is smaller on the distal end side of the shaft portion than on the proximal end side of the shaft portion, so that the resistance of the cut is small when driven When pulling out, the resistance increases due to the material entering the cut, and the pull-out strength becomes higher.

  According to the sixth aspect of the present invention, the valley line of the V-shaped cut extends in a direction substantially perpendicular to the spiral direction of the spiral portion, so that the nail rotates in the spiral direction when receiving a pulling force. Thus, the pullout strength can be further improved.

  According to the invention which concerns on Claim 7, the taper part which diameter-reduces gradually is formed in the front-end | tip of an axial part, The cylinder part without a spiral is formed between this taper part and the said spiral part, This cylinder part The outer diameter of the non-spiral part is the same as or slightly smaller than that of the non-spiral part, so that the blank material can be prevented from flowing directly into the spiral part when rolling the tip part. Can be formed by connecting them smoothly. In addition, since the cylindrical portion can play a role as a guide when nailing the panel into the panel and can be smoothly placed, the peripheral edge of the hole formed in the panel is not scraped off, and the panel powder falls off. It is prevented.

  According to an eighth aspect of the present invention, there is provided a panel in which the nail for a bullet ball game machine according to the seventh aspect is driven, wherein the hole is formed in advance and is made of resin and is used for driving the nail. In addition, since the diameter of the hole is the same as or slightly smaller than the outer diameter of the non-spiral portion and smaller than the outer diameter of the spiral portion, the pullout strength can be greatly improved in a resin panel having low elasticity. Further, the peripheral edge of the hole is not scraped by the cylindrical portion and the non-spiral portion, and the spiral portion is firmly fixed to the panel.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a nail and a ball game machine panel according to the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a side view of a nail for a ball game machine according to the present invention (hereinafter sometimes simply referred to as a nail).
The nail (1) for a ball game machine according to the present invention is placed in a hole formed in advance in a panel of a ball game machine such as a pachinko machine to form a flow path of the game ball or a role such as a windmill. A head (2) to be used for attachment, to which a driving force is applied, and a shaft (3) to be inserted into the hole of the panel by the driving force applied to the head (2). Yes.

  The shaft portion (3) has a non-spiral portion (4) having no spiral on the proximal end side (head side) and a spiral portion (5) having a spiral formed on the outer peripheral surface on the distal end side. . In addition, a tapered portion (6) that gradually decreases in diameter is formed at the tip (front end) of the shaft portion (3), and a cylindrical portion without a spiral between the tapered portion (6) and the helical portion (5). (7) is formed.

The number of ridges of the spiral portion (5) formed on the shaft portion (3) is set to 6 or more.
That is, as described above, since the number of ridges of the spiral portion of the conventional ball game machine nail is four, the number of ridges of the spiral portion (5) of the ball ball machine nail according to the present invention is the conventional. 2 or more.
Thus, by setting the number of ridges of the spiral portion (5) to 6 or more, which is 2 or more more than that of the conventional ball game machine nail, the fixing strength to the panel is markedly higher than that of the conventional nail. In addition, the nail can be easily adjusted.

Hereinafter, this function and effect will be described in more detail.
FIG. 2 is a schematic cross-sectional view showing a state in which a spiral portion (5) of a ball game machine nail (1) is driven into a hole (21) previously formed in the panel, and a non-spiral portion The cross section of the position which entered the spiral part a little from the boundary surface of (4) and the spiral part (5) is shown.
In Fig. 2, (I) has four ridges, (II) has five ridges, (III) has six ridges, and (IV) has eight ridges. Respectively. Incidentally, in (I) to (IV), only the figure (a) is provided with a reference numeral for easy understanding of the figure.

When the number of ridges is four, that is, in the case of a conventional nail, the four ridges (8) bite into the peripheral edge of the hole (21) of the panel.
In this case, when an external force (see an arrow) is applied to the nail, the external force is received by only one (see (a)) or two (see (b) and (c)) ridges. Therefore, when the panel thickness is thin and the length of the biting portion cannot be taken sufficiently, the fixing strength is remarkably lowered.

Further, considering the direction of the external force and the positional relationship between the ridges, in the case of (a) and (b), the position of the ridge (8) is axisymmetric with respect to the vector of the external force, but in the case of (c) The positional relationship greatly deviates from the line symmetry. Actually, the positional relationship between the direction of the external force and the ridges is rarely the positional relationship of (a) and (b), and the positional relationship of (c) is almost the same.
When the external force direction and the positional relationship of the ridges are in the positional relationship of (c), the nail is easily loosened because a torque is applied to rotate the nail when an external force is applied. Moreover, since it becomes difficult to bend | bend with respect to the direction which is going to bend, it becomes difficult to adjust a nail to arbitrary angles. In other words, if the nail is bent when the ridge is positioned in line symmetry with respect to the direction of the external force, it will bend easily according to the direction of the external force, but if it is positioned in a non-linear symmetry, it will be difficult to bend. At the same time, a torque for rotating the nail is easily applied.

When the number of ridges is five, as is apparent from the figure, the positional relationship between the direction of the external force and the ridges is likely to be non-linearly symmetric (see (b) and (c)), and is In this case, the positional relationship is likely to deviate greatly from line symmetry.
Therefore, as in the case of four ridges, torque is generated to rotate the nail when an external force is applied, and the nail becomes easy to loosen. Furthermore, since it becomes difficult to bend | bend with respect to the direction which is going to bend, it is difficult to adjust a nail to arbitrary angles.

On the other hand, when the number of ridges is six, that is, in the case of the nail according to the present invention, the six ridges (8) bite into the periphery of the hole (21) of the panel.
In this case, when an external force is applied to the nail, there are rarely two (see (b)), but in most cases the external force is received by three ridges (see (a) and (c)). it can. Therefore, a high fixing strength can be obtained even when the plate thickness of the panel is thin and the length of the biting portion cannot be taken sufficiently.

Considering from the positional relationship between the direction of external force and the ridge, in the case of (a) and (b), the position of the ridge (8) is axisymmetric with respect to the vector of the external force as a center line, and in the case of (c) it is non-linear. It becomes a symmetrical positional relationship. However, the positional relationship between the direction of the external force and the ridge is often the positional relationship of (a) and (b), and the positional relationship of (c) is not a positional relationship greatly deviating from line symmetry but is a rough line. It can be said that it is in a symmetrical positional relationship.
For this reason, when an external force is applied, a torque for rotating the nail hardly acts, and the nail becomes difficult to loosen. Moreover, since it becomes easy to bend | bend with respect to the direction which is going to bend, it becomes possible to adjust a nail easily.

In addition, when the number of ridges is eight, the eight ridges (8) bite into the peripheral edge of the panel hole (21), and the external force is rarely three (see (a)), but in most cases four. It can be received at one of the ridges (see (b) and (c)). Therefore, it is possible to further increase the fixing strength to the panel.
Further, regarding the positional relationship between the direction of the external force and the ridges, in the case of (a) and (b), the position of the ridge (8) is axisymmetric with respect to the vector of the external force, and in the case of (c) This is a line-symmetric positional relationship. At this time, as compared with the case of 6 lanes, the positional relationship between the direction of the external force and the ridge is likely to be line symmetric, and even in the case of non-linear symmetry, the positional relationship is very close to line symmetry.
Therefore, the torque for rotating the nail when an external force is applied is less likely to act, and the nail can be prevented from loosening more reliably. Moreover, since it becomes easier to bend with respect to the direction which is going to bend, it becomes possible to adjust a nail more easily.

As described above, the nail for a ball game machine according to the present invention has a high fixing strength to the panel because the number of ridges of the spiral portion (5) is 6 or more, and the nail is easily adjusted. It becomes possible.
In the present invention, the number of ridges of the spiral portion (5) may be 6 or more, but it is preferably 6 or more, and most preferably 8.

The reason why the number of ridges is preferably an even number is that the following problems occur when the number of ridges is set to an odd number.
When the number of ridges is an odd number, when an external force is applied to the nail, in the cross section of the spiral part biting into the hole in the panel, the compressive force acts on the corner of the spiral part (the top of the ridge) and the tensile force is Acting on (between the ridges and ridges), or conversely, the possibility that the compressive force acts on the sides and the tensile force acts on the corners increases. In other words, the case where the shape on the compression side and the shape on the tension side are greatly different often occurs.
When the shape on the compression side and the shape on the pulling side are greatly different, the nail is not easily bent in the direction of the external force, so that it is difficult to bend the nail in any direction, that is, to adjust the nail.

The reason why the number of ridges of the spiral portion (5) is most preferably eight is as follows.
When the number of ridges is an even number of 6 or more, the specific number of ridges may be 6, 8, 10, 12,.
Here, comparing the number of ridges with six and eight, as described above, when the number of ridges is eight, the fixing strength to the panel is improved compared to the case with six ridges, and nail adjustment is easy. Is excellent.
On the other hand, when the number of ridges is 10 or more, there is a problem that the driving load increases because the number of bites into the hole of the panel increases. Depending on the dimensional accuracy of the spiral portion and the hole, the place of the panel material that is pushed away at the time of driving is lost, so that the driving load becomes extremely high, thereby bending the nail.
When the number of ridges of the spiral portion (5) is eight, while avoiding the demerits of increased driving load and resulting nail bending, while enjoying the advantages of improving the fixing strength to the panel and facilitating nail adjustment Can do.

In addition, the nail for a ball game machine according to the present invention has an advantage that the number of ridges of the spiral portion (5) is 6 or more, so that it is less likely to break than a conventional nail having 4 ridges. It also has.
As described above, the external force acting on the nail is likely to concentrate on the boundary portion between the spiral portion and the non-spiral portion, and easily breaks at the boundary portion due to the difference in the section modulus between the spiral portion and the non-spiral portion.
However, when the number of ridges in the spiral portion is 6 or more, the cross-sectional shape of the spiral portion approaches a circle, and thus the difference in the cross-sectional modulus between the spiral portion and the non-spiral portion becomes small. As a result, the stress concentration is relaxed and is not easily broken.
In addition, since the difference between the section modulus for the opposite direction force and the section modulus for the opposite direction force is reduced, the bending strength is comparable to both the opposite direction and the opposite direction. It will be. Therefore, even if a nail that receives a large amount of external force in the opposite direction and a nail that receives a large amount of external force in the diagonal direction are mixed, there is no great variation in the bending life due to the nail. In addition, since the ease of bending does not vary greatly depending on the direction of the external force, the nail can be easily adjusted.
And these actions and effects are more prominent when the number of ridges of the spiral portion (5) is eight than when the number of ridges is six.

FIG. 3 is a view showing a modified example of the ball game machine nail according to the present invention and is a partial side view in which the tip side is enlarged.
In the present invention, as shown in the drawing, it is preferable to form a plurality of cuts (9) in the ridges (8) of the spiral portion (5).
In the illustrated example, the notches (9) are formed at regular intervals in the direction along the ridge line (81) of the ridge (8). Further, the valley line (91) of the cut (9) extends in a direction perpendicular to the central axis direction of the spiral portion (5).

FIG. 4 is an enlarged view showing a cross-sectional shape in a direction along the ridgeline (81) of the ridge (8) of the cut (9).
As shown in the figure, the notch (9) is V-shaped, and the angle formed by the inclined portion (inclined surface) with the ridge line (peak top) of the ridge is the angle at the tip end side (front side in the driving direction) ( α) is set smaller than the angle (β) on the shaft base end side (rear side in the driving direction). Specifically, it is preferable to set the angle (α) to 90 to 100 ° and the angle (β) to 140 to 150 °, but these angles are not limited.

In this way, by forming a plurality of V-shaped cuts (9) in the ridges (8) of the spiral portion (5), the panel material is cut into the cuts (9) when nails are driven into the panel holes. Enters. Then, since the material that has entered becomes resistance to the pulling force, the pulling strength is increased, and the fixing strength to the panel against the external force is improved.
In addition, the angle formed by the inclined portion of the notch (9) with the ridge line of the ridge is smaller on the distal end side of the shaft portion than on the proximal end side of the shaft portion. When pulling out, the resistance increases due to the material entering the cut, and the pull-out strength increases.

FIG. 5 is an enlarged partial side view of the tip side of another modified example of the nail for a ball game machine according to the present invention.
This modified example is different from that shown in FIG. 4 in that the valley line (91) of the V-shaped cut (9) is in the spiral direction of the spiral portion (5) (the direction along the ridge line of the ridge (8)). It is the point extended in the substantially right angle direction.

  As described above, the trough line (91) of the V-shaped cut (9) extends in a direction substantially perpendicular to the spiral direction of the spiral portion (5), whereby the pullout strength can be further improved. That is, when the nail is pulled out, it rotates in the spiral direction, but the valley line (91) of the notch (9) extends in a direction substantially perpendicular to the spiral direction of the spiral portion (5). This can be prevented and the pull-out strength can be further improved.

The tapered portion (6) is a portion that functions to guide the vertical insertion of the nail into the panel hole. In the example of FIG. 1, the tip has a rounded shape. In the examples of FIGS. It has a flat truncated cone shape.
In the present invention, the tip shape of the taper portion (4) is not particularly limited. For example, it is good also as a shape where the front-end | tip sharpened in order to drive and use for the wooden panel and resin panel which are not opened the hole beforehand.

The outer diameter of the non-spiral cylindrical part (7) formed between the tapered part (6) and the spiral part (5) is the same as or slightly smaller than the outer diameter of the non-spiral part (4). Yes. Since the outer diameter of the spiral portion (5) is larger than that of the non-spiral portion (4), the outer diameter of the cylindrical portion (7) is smaller than that of the spiral portion (5).
Since such a cylindrical part (7) serves as a guide for guiding the spiral part (5) perpendicularly to the panel when the nail is placed in the hole of the panel, the nail is placed smoothly and straightly. Will be able to.
Therefore, the peripheral edge of the hole formed in the panel is hardly scraped off by the spiral portion (5), and the powder falling of the panel is prevented.

The cylindrical portion (7) plays an important role in the manufacturing process.
A nail for a ball game machine according to the present invention is manufactured by drawing a metal wire such as brass and then rolling it.
FIG. 6 is a schematic cross-sectional view showing the rolling process.
In the rolling process, a blank (drawn wire) (12) is sandwiched between a die plate (11) incorporating a knurled mold (10) and a flat plate (not shown). The plate is moved in the opposite direction relative to the other plate, and the blank is rotated about the axis between the two plates. Thereby, a spiral part (5) is formed in the part corresponding to a knurled metal mold | die (10), and a taper part (6) is formed in the downward direction.
Here, when there is no portion corresponding to the cylindrical portion (7) as shown in the figure, the blank material flows into the joint between the knurled mold (10) and the die plate (11) during the rolling process (the arrow in the right figure). The obtained molded product is in a state where the blank material flows into the spiral portion (5) at the boundary with the taper portion (6).
However, by providing the cylindrical portion (7) between the tapered portion (6) and the spiral portion (5), the blank material can be prevented from flowing into the spiral portion, and the line from the spiral portion to the tip portion can be prevented. It becomes possible to form by connecting smoothly.

FIG. 7 is a partial cross-sectional view of a panel for a ball game machine according to the present invention.
The panel (20) is made of synthetic resin such as polycarbonate or transparent acrylic resin, and the hole (21) is formed by machining (for example, drilling) or molding. The thickness of the panel (20) is, for example, 10 mm.

In the hole (21), the nail (1) for a ball game machine according to the present invention described above is driven.
In general, a resin panel is less elastic than a wooden panel and therefore has a smaller force to hold a nail. However, by placing a nail (1) for a ball game machine according to the present invention, a resin panel having a low elasticity is provided. It is possible to greatly improve the pull-out strength of the nail.

The diameter of the hole (21) is set to be the same as or slightly smaller than the outer diameter of the non-spiral portion (4) of the ball game machine nail (1) and smaller than the outer diameter of the spiral portion (5).
By setting in this way, when the nail for a ball game machine according to the present invention is driven into the hole (21), the peripheral edge of the hole is not scraped by the cylindrical part (7) and the non-spiral part (4). In addition, the spiral portion (5) is firmly fixed to the panel in order to bite into the peripheral edge of the hole.
As an example of the dimensions of each part, the diameter of the hole (21) is φ1.85 mm, the outer diameter of the non-spiral part (4) is φ1.85 mm, and the outer diameter of the spiral part (5) is φ2.00 mm.

  In the state where the ball game machine nail (1) is driven into the hole (21), the boundary portion (13) between the spiral portion (5) and the non-spiral portion (4) is slightly buried from the surface of the panel (20). It becomes the position. Although the specific position of the boundary varies depending on the thickness of the panel, it is generally in the range of about 0.5 to 3 mm from the panel surface.

  The ball game machine panel according to the present invention can be used as a panel of a ball ball game machine such as a pachinko machine, and the ball ball nail according to the present invention forms a flow path of game balls on the panel. It can be used to attach a character such as a windmill.

It is a side view of a nail for a ball game machine according to the present invention. It is a schematic sectional view showing a state in which a spiral part of a ball game machine nail is driven in a hole formed in the panel in advance, and enters the spiral part a little from the boundary surface between the non-spiral part and the spiral part A cross section of the position is shown. (I) shows four ridges, (II) shows five ridges, (III) shows six ridges, and (IV) shows eight ridges. ing. It is the example of a change of the nail for a ball game machine concerning the present invention, and is the partial side view which expanded the tip side. It is an enlarged view which shows the cross-sectional shape of the direction in alignment with the ridgeline of the cut ridge. It is the partial side view to which the front end side of another modified example of the nail for bullet ball game machines concerning the present invention was expanded. It is a schematic sectional drawing which shows a rolling process. It is a partial cross section figure of the panel for bullet ball game machines concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nail | ball_game nail 2 Head 3 Shaft part 4 Non-spiral part 5 Spiral part 6 Tapered part 7 Cylindrical part 8 Yamajo 81 Ridge line 9 Cut 91 Valley line 20 Panel 21 Hole

Claims (8)

A head part and a shaft part, the shaft part being a nail for a ball game machine to be driven on a panel of a ball game machine,
The shaft portion has a non-spiral portion without a spiral on the proximal end side, and a spiral portion in which a spiral is formed on the outer peripheral surface on the distal end side,
A nail for a ball game machine, wherein the number of ridges of the spiral portion is 6 or more.   2. The ball game machine nail according to claim 1, wherein the number of ridges of the spiral portion is an even number.   The nail for a ball game machine according to claim 2, wherein the number of ridges of the spiral portion is eight.   The nail for a ball game machine according to any one of claims 1 to 3, wherein a plurality of V-shaped cuts are formed in the ridges of the spiral portion.   5. The nail for a ball game machine according to claim 4, wherein the angle formed by the inclined portion of the V-shaped cut with the ridge line of the ridge is smaller on the distal end side of the shaft portion than on the proximal end side of the shaft portion.   6. The nail for a bullet ball game machine according to claim 4, wherein the valley line of the V-shaped cut extends in a direction substantially perpendicular to the spiral direction of the spiral portion.   A tapered portion that gradually decreases in diameter is formed at the tip of the shaft portion, and a cylindrical portion without a spiral is formed between the tapered portion and the spiral portion, and the outer diameter of the cylindrical portion is that of the non-spiral portion. The nail for a ball game machine according to any one of claims 1 to 6, characterized in that it is the same as or slightly smaller than the outer diameter. A panel in which the nail for a ball game machine according to claim 7 is provided,
It is made of resin, and a hole for placing the nail is formed in advance,
A panel for a ball game machine, wherein a diameter of the hole is equal to or slightly smaller than an outer diameter of the non-spiral portion and smaller than an outer diameter of the spiral portion.

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