JP2007306949A - Nail for pinball game machine and board structure for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide nails and a board structure for pinball game machines which causes no cracking or no white turbidity in the board made of a resin and enables the vertical driving of the nails along holes formed in the board by achieving a higher fixing strength of the nails with respect to the board while surely preventing slipping off the board and idly turning in it. <P>SOLUTION: The nails for pinball game machines each includes a head part and a shaft part and the shaft part is driven into a tapered hole formed in the board of a pinball game machine to form a passage of game balls. The shaft part has a tapered part tapered toward its tip and the tapered part has a close contact part so arranged at its base end part and tip part made as to be kept closely in contact with the internal surface of the tapered hole while having a sting part arranged between the base end part and the tip part so as to be stung into the internal surface of the tapered hole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a ball game machine nail for forming a flow path of a game ball by being driven into a board in a ball game machine such as a pachinko machine, and a base structure of a ball game machine including the nail and the board. Is.

In a ball game machine such as a pachinko machine, a flow path of a game ball is formed by a large number of nails driven into holes formed in a base.
The nail that is driven into the base in this way will not be rotated by the impact force given by the external force applied by the hammer for the collision of the game ball or the adjustment of the nail, or it will not fall out of the base. It is necessary to be firmly fixed to.

  Therefore, many techniques for increasing the fixing strength of the nail with respect to the base have been proposed conventionally. For example, in Patent Document 1 below, a plurality of ridges having different heights are inserted into a driving insertion part driven into the base. There has been disclosed a game nail provided with a multiple spiral portion in which various types of spiral bodies are mixed.

  According to the disclosed technology of Patent Document 1 below, although the fixing strength to the base can be increased as compared with the conventional nail, since the resistance at the time of driving increases, the vertical driving is performed along the hole formed in the base. There was a problem that it was not easy. In addition, there is a risk of causing cracks and white turbidity in the resin base during driving.

  Moreover, in the base of the conventional ball game machine, especially the base made of resin, since the hole formed for driving the nail was formed by a drill, it was a straight hole. Therefore, the nail to be driven cannot be satisfactorily guided along the hole, making it difficult to drive the nail vertically, and causing a crack or white turbidity in the resin base during the driving. In addition, cracks and white turbidity may occur in the substrate during drilling with a drill.

JP 2000-84162 A

  The present invention has been made to solve the above-mentioned problems of the prior art, and has a high fixing strength to the base, can reliably prevent the base from coming off and rotating, and is provided along a hole formed in the base. Therefore, it is intended to provide a nail for a ball game machine and a base structure for a ball game machine that can be surely driven vertically and do not cause cracks or cloudiness in a resin board.

  The invention according to claim 1 includes a head and a shaft portion, and the shaft portion is driven into a tapered hole formed in a base of the ball game machine to form a flow path of the game ball. The shaft portion has a taper portion that tapers toward the tip, and the taper portion has a close contact portion in close contact with the inner surface of the taper hole at the base end portion and the tip end portion. In addition, the present invention relates to a nail for a ball game machine, characterized by having a biting portion that bites into the inner surface of the tapered hole between the base end portion and the tip end portion.

  The invention according to claim 2 is characterized in that the biting portion contracts with a first frustoconical portion whose diameter decreases toward the tip with substantially the same inclination as the taper hole, and with a larger inclination than the taper hole toward the tip. 2. The nail for a ball game machine according to claim 1, further comprising a second frustoconical portion having a diameter alternately arranged in the axial direction.

  In the invention according to claim 3, the axial length of the distal end portion of the close contact portion, the axial length of the proximal end portion of the close contact portion, and the axial length of the first frustoconical portion are in this order. 3. The nail for a ball game machine according to claim 2, wherein the nail is large.

  In the invention according to claim 4, the axial length of the proximal end portion of the close contact portion is larger than the axial length of the distal end portion of the close contact portion and the axial length of the first truncated cone portion. 3. The nail for a ball game machine according to claim 2, wherein the nail is a ball game machine.

  The invention according to claim 5 relates to the nail for a ball game machine according to claim 1, wherein the biting portion is provided with a spirally formed protrusion.

  The invention according to claim 6 relates to a nail for a ball game machine according to claim 5, wherein a substantially V-shaped notch is formed in a part of the protrusion.

  The invention according to claim 7 relates to a nail for a ball game machine according to any one of claims 1 to 6, wherein an axial groove is formed in the biting portion.

  According to an eighth aspect of the present invention, there is provided a ball game machine nail having a head portion and a shaft portion, and a base having a taper hole into which the shaft portion of the ball ball game machine nail is driven. The ball game nail has a taper portion tapered toward the tip at the shaft portion, and the taper portion has a close contact portion in close contact with the inner surface of the taper hole at the base end portion and the tip end portion. In addition, there is a biting portion that bites into the inner surface of the tapered hole between the base end portion and the distal end portion, and the base is formed with a tapered hole by synthetic resin molding. Regarding the base structure.

  According to the first aspect of the present invention, the close contact portion provided on the shaft portion of the ball game machine nail is in close contact with the taper hole when driven into the base, thereby preventing tilting with respect to the taper hole (centering). ) And the effect of preventing loosening when the ball hits the nail. Further, when the biting portion bites into the taper hole, an effect of preventing the taper hole from coming off is exhibited. As a result, the fixing strength to the base is high, and it is possible to reliably prevent the base from coming off and rotating, and it can be easily driven vertically along the hole formed in the base, and the resin base is not cracked or clouded. It becomes a nail for a ball game machine that does not occur.

  According to the second aspect of the present invention, the biting portion has a first truncated cone-shaped portion that decreases in diameter toward the tip with substantially the same inclination as the tapered hole, and a diameter that decreases toward the tip with a larger inclination than the tapered hole. By providing the second truncated cone-shaped portions alternately in the axial direction, when the first truncated cone-shaped portion bites into the tapered hole, the base material is made to be the second truncated cone-shaped portion and the tapered hole. It is possible to escape to the space between the inner surface, and the escaped material can be filled into this space, thereby enhancing the retaining action.

  According to the invention of claim 3, the axial length of the close contact portion of the distal end portion, the axial length of the close contact portion of the proximal end portion, and the axial length of the first truncated cone portion are in this order. By being large, it is possible to prevent the base material from being convexly curved toward the nail head.

  According to the invention which concerns on Claim 4, the axial direction length of the close part of a base end part is larger than the axial direction length of the close part of a front-end | tip part, and the axial direction length of a 1st frustoconical part. A stable retaining function is exhibited.

  According to the invention which concerns on Claim 5, since the biting part is provided with the protrusion formed in the spiral, it can be driven into the taper hole of the base while rotating the nail. Therefore, the driving load can be reduced, and at the same time, breakage and cloudiness from the hole of the resin base can be prevented.

  According to the invention according to claim 6, by forming a substantially V-shaped notch in a part of the protrusion, when the protrusion bites into the taper hole of the base, the base material enters the notch, It is possible to increase resistance to retaining from the base and resistance to rotation.

  According to the invention which concerns on Claim 7, since the groove | channel of the axial direction is formed in the biting-in part, the fall-out prevention resistance from a base | substrate and a rotation prevention resistance can be raised.

  According to the invention according to claim 8, the combination of the nail for a specific shape of the ball game machine and the tapered hole shape formed in the base provides high fixing strength to the base and reliably prevents the base from coming off and rotating. In addition, a base structure having a nail for a ball game machine that can be easily driven vertically along a hole formed in the base is obtained. Further, since the base has a tapered hole formed by synthetic resin molding, the resin base is less damaged and a highly accurate hole can be obtained compared to drilling.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a nail for a ball game machine and a base structure of a ball game machine according to the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a first embodiment of a nail for a ball game machine according to the present invention, and FIG. 2 is a partially enlarged cross-sectional view showing a base into which the nail for a ball game machine according to the present invention is driven. 3 is a partial enlarged cross-sectional view showing a base in a state before a nail for a ball game machine according to the first embodiment is driven.

  A nail (1) for a ball game machine according to the present invention is driven into a tapered hole (21) formed in a base (20) of a ball game machine such as a pachinko machine to form a flow path of the game ball. And it has the head (2) to which driving force is applied, and the axial part (3) inserted in the taper hole formed in the base | substrate.

  The shaft portion (3) has a columnar straight portion (4) formed continuously below the head portion (2), and is formed continuously below the straight portion (4) and tapers toward the tip. And a tapered portion (5). In the illustrated example, the tip end surface of the shaft portion (3) is a flat surface, but may have another shape such as a spherical shape.

  The taper portion (5) has a close portion (6) that is in close contact with the inner surface of the taper hole (21) of the base (20) when driven into the proximal end portion and the distal end portion. Further, the biting portion (7) that bites into the inner surface of the tapered hole (21) of the base (20) when driven between the base end portion and the tip end portion (that is, between the two close contact portions (6)). have.

  The two close contact portions (6) are formed in a truncated cone shape having a taper having substantially the same inclination as the tapered hole (21) of the base (20). And the side peripheral surface (taper surface) of these two close parts is on the same straight line which has substantially the same inclination as the inner taper surface of the taper hole (21) as shown by a virtual line (K) in FIG. is there.

The biting portion (7) has a first frustoconical portion (8) that is reduced in diameter toward the distal end with substantially the same inclination as the tapered hole (21), and has a larger inclination than the tapered hole (21) toward the distal end. Second frustoconical portions (9) having a reduced diameter are alternately provided in the axial direction.
At least two of the first frustoconical portion (8) and the second frustoconical portion (9) are formed.

  Thus, by providing the first truncated cone-shaped portions (8) and the second truncated cone-shaped portions (9) having different taper inclinations alternately in the axial direction, the nail (1) is formed into a tapered hole (21 ), A space is formed between the biting portion (7) of the nail (1) and the inner surface of the tapered hole (21). This space can receive the deformed portion of the tapered hole and the base material to be scraped when the first frustoconical portion (8) bites into the inner surface of the tapered hole (21). Enhanced.

  The outer diameter of the side circumferential surface (tapered surface) of the first frustoconical portion (8) of the biting portion (7) is an imaginary line (K) connecting the side circumferential surfaces (tapered surfaces) of the two closely contacting portions (6). ) (See FIG. 3) or a size slightly protruding from the virtual line (K).

The axial length (L1) of the close portion (6) of the distal end portion, the axial length (L2) of the close portion (6) of the proximal end portion, and the axial direction of the first frustoconical portion (8) The lengths (L3) may all be the same, but are preferably set to be larger in the order of L1>L2> L3.
By setting in this way, when the ball game machine nail is driven into the taper hole of the base, the tip of the nail (1) is smoothly guided along the taper hole (21), and the base material is made of the nail. A convex curve in the head direction is prevented.

In addition, a configuration in which the above-described three axial lengths (L1, L2, L3) are set to a relationship of L2> L1 = L3 can be preferably employed.
By setting in this way, in the inlet portion where the inner diameter of the tapered hole (21) is the largest, the close portion (6) of the base end portion comes into close contact with a wide area, and a stable retaining function is exhibited. .

FIG. 4 is a front view showing a second embodiment of a ball game machine nail according to the present invention, and FIG. 5 is a portion showing a base in a state before the ball game machine nail of the second embodiment is driven. It is an expanded sectional view.
The nail for a ball game machine according to the second embodiment is different from the first embodiment only in the configuration of the biting portion (7), and other configurations such as the configuration of the close contact portion (6) are the same. The same components are denoted by the same reference numerals and description thereof is omitted.

The nail for a ball game machine according to the second embodiment includes a protrusion (10) in which the biting portion (7) is formed in a spiral shape. In the figure, a line indicated by reference numeral (11) indicates a trough formed between the ridges.
The biting portion (7) is reduced in diameter toward the tip with substantially the same inclination as the tapered hole (21), and the outer diameter of the ridge (10) is the side peripheral surface (tapered) of the two close contact portions (6). It is formed in a size slightly projecting from a virtual line (K) (see FIG. 5) that connects the surfaces).

FIG. 6 shows an enlarged cross-sectional view along the ridgeline of the ridge (10).
In the second embodiment, as shown in the drawing, a substantially V-shaped notch (12) can be formed in a part of the ridge (10).
The notch (12) is formed shallower than the depth of the valley (11). Further, the V-shaped inclination (inclination with respect to the ridge line) is formed so as to be gentle on the head side and steep on the tip side.
The cutout (12) formed in this way is used to prevent the base material from entering the cutout when the ridge (10) bites into the tapered hole (21) of the base (20). Demonstrate the effect of increasing the stopping resistance.

In the first and second embodiments described above, as shown in FIGS. 7 and 8, an axial groove (13) can be formed in the biting portion (7). FIG. 7 shows an example in which the groove (13) is provided in the first embodiment, and FIG. 8 shows an example in which the groove (13) is provided in the second embodiment.
At least one groove (13) may be provided, but two or more grooves (13) may be provided. Moreover, about the cross-sectional shape of a groove | channel (13), it can be set as arbitrary shapes, such as V shape, U shape, a concave shape, and a semicircle.
Thus, by forming the groove extending in the axial direction in the biting portion, it is possible to increase the resistance to preventing the base from coming off and the resistance to preventing the rotation.

The base (20) is made of a molded product obtained by molding a synthetic resin such as transparent acrylic resin or polycarbonate by a molding method using a mold such as injection molding, and the tapered hole (21) is also formed at the time of molding.
Thus, since the base plate (20) used in the present invention has the tapered hole (21) formed by synthetic resin molding, it becomes a hole with higher accuracy than the tapered hole formed by drilling, and the taper is also tapered. Damage such as cracking does not occur during the formation of the holes.
The tapered hole (21) formed in the base (20) may be a through hole or a non-through hole. The angle (θ) is preferably 4 to 6 °.

  The present invention is used in a ball game machine such as a pachinko machine.

1 is a front view showing a first embodiment of a nail for a ball game machine according to the present invention. It is a partial expanded sectional view which shows the base | substrate in which the nail for bullet ball game machines concerning this invention is driven. It is a partial expanded sectional view which shows the base | substrate of the state in the near side where the nail for bullet ball game machines of 1st embodiment is driven. It is a front view which shows 2nd embodiment of the nail for bullet ball game machines concerning the present invention. It is a partial expanded sectional view which shows the base | substrate in the state before the nail | claw for a ball game machine of 2nd embodiment is driven. The expanded sectional view along the ridgeline of a protrusion is shown. In 1st embodiment, it is a front view which shows the example which formed the groove | channel of the axial direction in the biting part. In 2nd embodiment, it is a front view which shows the example which formed the groove | channel of the axial direction in the biting part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nail | ball_game nail 2 Head part 3 Shaft part 5 Tapered part 6 Close part 7 Biting part 8 First truncated cone-shaped part 9 Second truncated cone-shaped part 10 Projection 12 Notch 13 Groove 20 Base 21 Tapered hole

Claims (8)

A nail for a ball game machine comprising a head and a shaft part, the shaft part being driven into a taper hole formed in a base of the ball game machine to form a flow path of a game ball,
The shaft portion has a tapered portion that tapers toward the tip,
The tapered portion has a close contact portion that is in close contact with the inner surface of the tapered hole at the proximal end portion and the distal end portion, and a biting portion that bites into the inner surface of the tapered hole between the proximal end portion and the distal end portion. A nail for a ball game machine characterized by that.   The bite portion has a first frustoconical portion whose diameter decreases toward the tip with substantially the same inclination as the tapered hole, and a second frustoconical shape whose diameter decreases toward the tip with a greater inclination than the taper hole. 2. The nail for a ball game machine according to claim 1, wherein the portions are alternately provided in the axial direction.   The axial length of the close portion of the distal end portion, the axial length of the close portion of the proximal end portion, and the axial length of the first frustoconical portion are larger in this order. Nails for ball game machines.   3. The bullet ball according to claim 2, wherein the axial length of the close portion of the proximal end portion is larger than the axial length of the close portion of the distal end portion and the axial length of the first truncated cone portion. Nails for gaming machines.   2. The nail for a ball game machine according to claim 1, wherein the biting portion includes a spirally formed protrusion.   6. A nail for a ball game machine according to claim 5, wherein a substantially V-shaped notch is formed in a part of the protrusion.   The nail for a ball game machine according to any one of claims 1 to 6, wherein an axial groove is formed in the biting portion. A ball game machine nail having a head and a shaft, and a base having a taper hole into which the shaft of the ball game machine nail is driven,
The ball game machine nail has a tapered portion that tapers toward the tip at the shaft portion;
The tapered portion has a close contact portion that is in close contact with the inner surface of the tapered hole at the proximal end portion and the distal end portion, and a biting portion that bites into the inner surface of the tapered hole between the proximal end portion and the distal end portion. And
A base structure of a ball game machine, wherein the base has a tapered hole formed by synthetic resin molding.

Images