JP2009095459A - Prepared hole processing jig and drilling working method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a prepared hole processing jig which can correctly make a prepared hole in a game board utilizing an attachment hole formed in a fixed object, and to provide a drilling working method. <P>SOLUTION: The prepared hole processing jig 10 consists of a rod-like punch member 34 and a holders 38 which slidably supports the punch member 34. The punch member 34 has the first shaft portion 40 and the second shaft portion 42 continuously placed at one end in the axial direction in the first shaft portion 40 and at the front end of the second shaft portion 42, a perforating member 48 is mounted in a way able to remove and exchange. The holder 38 consists of a gripper 50 and a thin pillar portion 52 which is continuously placed in one end in the axial direction in the gripper 50 and is narrower than the gripper 50. An accommodation part 36, which slidably supports the punch member 34, is pierced in the axial direction over the gripper 50 and the thin pillar portion 52. A projection 56, which can be engaged with the attachment hole formed in a back trough, is formed at the front end of the thin pillar portion 52. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pilot hole processing jig for forming a pilot hole in a game board for screwing an object to be fixed to the game board, and a drilling method using the pilot hole processing jig.

  If you want to screw the back of the game board to the back of the game board with an automatic screw tightener, make a master product with the back board screwed to the game board in advance, and teach the screw head in the master product. By doing so, screwing of the back hook is automatically performed by an automatic screw tightening machine. The screwing operation of the reverse side of the game board that is the master product is performed by temporarily placing the reverse side on the back of the game board and holding the screw in the center of the mounting hole formed on the reverse side. It is done by screwing into the game board. However, since there is no pilot hole in the back of the game board for inserting and guiding the tip of the screw, when the screw is screwed in, the position is shifted or tilted, and the screw head is shifted from the correct position. There is a risk that. In addition, since a hard plate-like warpage preventing plate for preventing warping of the game board is adhered to the back surface of the game board, screw misalignment or the like is likely to occur due to the warpage prevention plate.

Therefore, by preparing a pilot hole in the back of the game board in advance, it is possible to prevent the screw from being displaced or being screwed obliquely. As the jig for making the prepared hole, for example, as disclosed in Patent Document 1, a punch member is slidably inserted into a through hole formed in the guide body, and a center position provided at the distal end portion of the guide body. Center hole engraving that uses the mating part to align the tip protrusion of the punch member with the machining position (drilling position) and tap the head of the punch member with a hammer to make a pilot hole at the machining position. There is a jig.
JP 2000-317862 A

  In the center hole engraving jig, the tip protrusion of the punch member can be accurately positioned at the processing position by aligning the center alignment portion of the guide body with the marking line written in advance at the processing position. However, in an actual work site, it is complicated to write a marking line accurately at each of a plurality of machining positions, and there is a problem that work efficiency is lowered. Therefore, it is conceivable to make a pilot hole through an attachment hole formed in the backside with the backside temporarily placed on the game board as described above.

  The back cage is a guide path for guiding a winning ball passed to the back side of the game board, and an edge of a main body provided with a plurality of installation bases for mounting a liquid crystal device and various substrates, A flange extending outward is formed, and the mounting hole is formed in the flange. That is, since the guide path and various tall installation bases are located close to the flange, the center hole engraving jig provided with a large-diameter center alignment part at the tip part has a center position. In some cases, the mating part interferes with the installation base part and the like, so that the center hole engraving jig cannot be held perpendicular to the flange. Further, since the width of the flange in which the mounting hole is formed is narrow, the entire end surface of the guide body cannot be brought into contact with the flange, and the center hole engraving jig may not be stably held. . Further, the center hole engraving jig is premised on that a marking line for aligning the center alignment portion is written in order to accurately align the tip protrusion of the punch member with the processing position. Therefore, it is difficult to accurately align the tip protrusion of the punch member with the center of the mounting hole in the reverse side where no marking line is written. In other words, the center hole engraving jig disclosed in Patent Document 1 can accurately make a pilot hole in the vicinity of the processing position on an unobstructed surface, It is not applicable to the case where there is an obstacle in the vicinity or the mounting hole is formed in a narrow flange.

  That is, the present invention has been proposed in order to suitably solve the problems inherent in the pilot hole processing jig and the hole drilling method according to the prior art, and is a mounting hole formed in a fixed object. An object of the present invention is to provide a pilot hole processing jig and a drilling method that can accurately prepare a pilot hole in a game board using the above.

In order to overcome the above-mentioned problems and achieve the intended purpose, the invention according to claim 1 of the present application provides:
A rod-shaped punch member (34) and a holder (38) through which a receiving portion (36) for slidably supporting the punch member (34) is provided, and an object (14 ) In the pilot hole processing jig for opening the pilot hole (46) used for guiding the screw (28) fixing the game board (12), the holder (38),
A grip portion (50) provided on the head opening side of the housing portion (36) from which the head portion (44) of the punch member (34) protrudes;
A narrow column part that is provided between the tip provided with the tip opening of the housing part (36) from which the tip of the punch member (34) protrudes and the grip part (50) and is thinner than the grip part (50) (52)
Protruding portions (56) provided around the tip opening and capable of being fitted into mounting holes (30) of the screws (28) formed in the fixed object (14).

  According to the first aspect of the present invention, since the narrow column part on which the projection part that fits into the mounting hole is formed is thinner than the grip part, the grip part is gripped to stably hold the prepared hole processing jig. As a result, the application range of the mounting hole in which the protruding portion can be fitted without the narrow column portion interfering with the obstacle is widened. Also, by fitting the protrusions into the mounting holes, the tip of the punch member can be accurately aligned with the drilling position, so there is no need to write a marking line and the operation is simplified.

In the invention according to claim 2, in the taper shape corresponding to the taper-shaped guide portion (32) formed on the insertion side of the projection (56) in the mounting hole (30) and expanding to the insertion side, The gist is that the protrusion (56) is formed.
According to the second aspect of the present invention, since the protruding portion is formed in a tapered shape corresponding to the guide portion formed in the mounting hole, it is easy to align the protruding portion with the mounting hole.

In order to overcome the above-mentioned problems and achieve the intended purpose, the invention according to claim 3 of the present application is
A drilling method using the pilot hole processing jig according to claim 1 or 2,
The protrusion (56) of the holder (38) is fitted and aligned with the mounting hole (30) of the fixed object (14) positioned on the game board (12),
By hitting the head (44) of the punch member (34) protruding from the head opening of the holder (38), the tip of the punch member (34) protruding from the tip opening of the punch member (34) in the game board (12) A pilot hole (46) is formed in a portion corresponding to the mounting hole (30).
According to the third aspect of the present invention, the front end of the punch member can be accurately aligned with the drilling position simply by fitting the protrusion into the mounting hole, and the pilot hole can be accurately formed in the game board. . That is, the complicated work of writing a marking line is not necessary, and the processing work of the pilot hole is simplified. In addition, since the protruding portion is formed in a tapered shape corresponding to the guide portion formed in the mounting hole, the positioning of the protruding portion to the mounting hole is facilitated, and the work efficiency is improved.

  According to the pilot hole processing jig and the drilling method according to the present invention, it is possible to accurately and easily drill a pilot hole in the game board using the mounting hole of the fixed object.

  Next, the pilot hole processing jig and the hole drilling method according to the present invention will be described in detail below with reference to the accompanying drawings by giving a preferred embodiment.

  Prior to the description of the pilot hole machining jig 10 according to the embodiment, as a game board 12 to be subjected to the pilot hole machining by the pilot hole machining jig 10 and an object to be fixed by screwing to the back surface of the game board 12 This will be described with reference to the back cover 14 of.

  As shown in FIG. 8, the gaming board 12 has a cell board 18 on which a pattern or the like as a motif of a gaming machine is attached to the surface of a plywood board 16 of a predetermined thickness made of wooden plywood. Is attached to a warp prevention plate 20 of a predetermined thickness made of a hard material for preventing warping of the game board 12. Then, on the surface of the game board 12 when being used in the game, game parts such as various winning devices, game parts for display, etc. (none of which are shown) are arranged. In addition, the game board 12 is configured to pass a winning ball that has been passed to each winning device to the back side. Further, a back cage 14 is disposed on the back side of the game board 12.

  The back cage 14 is entirely formed of a synthetic resin, and the main body 24 has a guiding path (not shown) for guiding a winning ball passed to the back side of the game board 12, a liquid crystal A plurality of installation base portions 22 for attaching the apparatus and various substrates are provided. A flange 26 extending outward is formed at the end edge of the main body 24 (see FIG. 7). A mounting hole 30 through which a shaft portion of a screw 28 (see FIG. 8) for fixing the back cage 14 to the game board 12 is inserted is formed in the flange 26 in advance, and the flange 26 is brought into contact with the back of the board. In this state, the screw 28 inserted into the mounting hole 30 is fixed by screwing into the game board 12. The mounting hole 30 has a taper-shaped guide portion 32 that expands toward the insertion side (insertion side) on the periphery of the insertion side of the screw 28 (insertion side of the projection 56 in the pilot hole processing jig 10). Is formed. In the embodiment, a countersunk screw is used as the screw 28, and a recess in which the head of the countersunk screw is accommodated functions as the guide part 32.

  Here, the game board 12 has a limited installation area that can be secured for the reverse side. Further, since it is necessary to provide a plurality of guide paths and installation base portions 22 on the back cage 14, the flange 26 cannot be made sufficiently large, and the flange 26 is set to the minimum necessary width. Has been. For this reason, the wall part and the installation base part 22 which form the said guidance path | route which protrudes in the side spaced apart from the game board 12 with respect to the flange 26, and the attachment hole 30 formed in this flange 26 are shown in FIG. Close as shown.

  Next, the pilot hole processing jig 10 according to the embodiment will be described. As shown in FIGS. 1 to 3, the pilot hole machining jig 10 basically includes a rod-shaped punch member 34 and a holder 38 through which a receiving portion 36 that slidably supports the punch member 34 is penetrated. Composed. The punch member 34 is connected to a columnar first shaft portion 40 and a tip side that is one end in the axial direction of the first shaft portion 40, and is a columnar second shaft that is thinner than the first shaft portion 40. Part 42. Further, a head 44 protrudes from the rear end, which is the other axial end of the first shaft portion 40, and the head 44 is hit with a hammer or the like when the prepared hole 46 is processed. As shown in FIG. 4, the head 44 is formed with flat surfaces 44a, 44a that are opposed in the radial direction (in the embodiment, the pair of flat surfaces 44a, 44a that form a pair is 90 degrees in the circumferential direction). The two flat surfaces 44a and 44a that make a pair can be securely gripped with a tool such as pliers. A tapered portion 40 a that is reduced in diameter toward the second shaft portion 42 is formed on the distal end side of the first shaft portion 40.

  A drilling member 48 is detachably attached to the tip of the second shaft portion 42. The perforating member 48 includes a mounting portion 48a for the second shaft portion 42 and a pin portion 48b extending from one end of the mounting portion 48a. The tip of the pin portion 48b has a conical shape (for example, both left and right sides in a side view). The angle between the inclined surfaces is 60 degrees). As shown in FIG. 5, the piercing member 48 is configured to be mounted by inserting the mounting portion 48 a into a recess 42 a that is recessed at the tip of the second shaft portion 42. In addition, a through hole 42b that penetrates in the radial direction is formed in the second shaft portion 42, and a through hole 48c that penetrates in the radial direction is also bored in the mounting portion 48a, so that the mounting portion 48a is formed in the recess 42a. In the inserted state, a pin (not shown) is inserted into both the through holes 42b and 48c, thereby preventing the piercing member 48 from coming off.

  As shown in FIG. 3, the holder 38 is connected to a grip part 50 that is gripped when the pilot hole 46 is opened, and a narrow column part 52 that is connected to one end of the grip part 50 in the axial direction and is narrower than the grip part 50. And basically consists of The thickness (diameter) of the grip portion 50 is set to a value (for example, a diameter of 20 mm) that can be reliably and stably held by the operator when the pilot hole 46 is processed, whereas the thickness of the narrow column portion 52 is set. The (diameter) is set to a value (for example, a diameter of 10 mm) that allows a projection 56 described later to be fitted into the mounting hole 30 without interfering with the installation base portion 22 on the flange 26 having a small area in the back cover 14. .

  In the holder 38, the accommodating portion 36 that slidably supports the punch member 34 is penetrated in the axial direction across the grip portion 50 and the thin column portion 52. As shown in FIG. 1, the accommodating portion 36 is formed in the gripping portion 50, and is a first supporting portion set to an inner diameter dimension capable of slidably supporting the first shaft portion 40 of the punch member 34. 36a, a second support portion 36b formed in the narrow column portion 52 and having an inner diameter dimension capable of slidably supporting the second shaft portion 42 of the punch member 34, and the narrow column portion The third support portion 36c is formed at the front end portion of the punch member 34, and the pin portion 48b of the punching member 48 of the punch member 34 is slidably supported. That is, in the accommodating portion 36, one end of the first support portion 36a is a head opening that opens outward from the holder, and one end of the third support portion 36c is a tip opening that opens outward from the holder. The head opening is formed with a taper portion 37 that expands toward the outside, and the taper portion 40a formed on the first shaft portion 40 and the taper portion 37 punch the housing portion 36. The member 34 can be easily inserted. The punch member 34 is rotatably supported with respect to the accommodating portion 36, and allows the rotation of the punch member 34, which will be described later, to loosen the biting state of the pin portion 48b with respect to the game board 12. Further, knurled stitches for preventing slipping are formed on the outer peripheral surface of the gripping part 50 (see FIG. 2).

  Here, the radial clearances between the third support portion 36c and the pin portion 48b are the radial directions of the first support portion 36a and the first shaft portion 40, and the second support portion 36b and the second shaft portion 42, respectively. It is set smaller than the clearance. As a result, the pin portion 48b inserted through the third support portion 36c advances and retreats in a posture in which the axis thereof substantially coincides with the central axis of the third support portion 36c, so that the radial blurring during the preparation of the pilot hole is performed. Can be suppressed. For example, the diameter of the first shaft portion 40 is 11.8 mm, the inner diameter of the first support portion 36a is 12 mm, the diameter of the second shaft portion 42 is 6 mm, and the inner diameter of the second support portion 36b is 6.5 mm. The diameter of the pin portion 48b is set to 3 mm and the inner diameter of the third support portion 36c is set to 3.1 mm.

  A stepped portion 54 is formed at the connecting portion between the first support portion 36 a and the second support portion 36 b in the storage portion 36 due to the difference in inner diameter between the support portions 36 a and 36 b. When the member 34 is accommodated, as shown in FIG. 1, one end of the first shaft portion 40 of the punch member 34 is brought into contact with the stepped portion 54 so that the position is regulated. In the state where the position of the punch member 34 is regulated by the step portion 54, the head portion 44 provided on the first shaft portion 40 protrudes outward from the first support portion 36a (head opening), and the pin portion 48b is 3 The axial dimension of each support part 36a, 36b, 36c is set so as to protrude outward from the support part 36c (tip opening). And in the position control state of the punch member 34 by the step part 54, the depth dimension of the prepared hole 46 in the game board 12 is decided by the protrusion dimension of the pin part 48b which protrudes from the 3rd support part 36c. That is, the depth of the pilot hole 46 in the game board 12 can be changed by mounting the drilling member 48 having different projecting dimensions of the pin portion 48b from the mounting portion 48a on the second shaft portion 42.

For example, as specific dimensions of the punch member 34 and the holder 38, as shown in FIG. 3, the length L ₁ of the first shaft portion 40 accommodated in the first support portion 36a of the holder 38 in the punch member 34 is set as follows. In contrast to the setting of 90 mm, the length M ₁ of the first support portion 36a is set to 90 mm, so that the head portion is in a position-restricted state in which one end of the first shaft portion 40 is in contact with the stepped portion 54. 44 protrudes from the head opening outside the holder. Incidentally, the projecting dimension of the head 44 from the first shaft portion 40 is 10 mm, and the width dimension of the flat surface 44 a is also set to 10 mm. The length including the mounting portion 48a of the punching member 48 attached to the second shaft portion 42 and the second shaft portion 42, which is the portion of the punch member 34 accommodated in the second support portion 36b of the holder 38. By setting the length M ₂ of the second support portion 36b to 40 mm while setting L ₂ to 39 mm, the tip of the mounting portion 48a in the position-regulated state becomes the second support as shown in FIG. It is comprised so that the step part formed in the connection part of the part 36b and the 3rd support part 36c may not be contacted. Further, the length of the pin portion 48b is set to 12 mm, and the length L ₃ from one end of the first shaft portion 40 contacting the stepped portion 54 to the tip of the pin portion 48b is set to 51 mm. the length M ₃ to the tip of the protrusion 56 to be described later from the stepped portion 54 of the holder 38 by setting the 45 mm, the projecting dimension of the pin portion 48b of the distal opening of the holder 38 becomes 6 mm.

  A protrusion 56 is provided at the tip of the narrow column 52 around the tip opening of the third support 36c. The protruding portion 56 is set to have an outer diameter dimension that can be fitted into the mounting hole 30 formed in the back cover 14. More specifically, the protruding portion 56 is formed in a tapered shape having a diameter reduced toward the open end corresponding to the guide portion 32 formed in the mounting hole 30 (see FIG. 6). Is fitted in the mounting hole 30, the axis of the third support portion 36 c, that is, the pin portion 48 b inserted through the third support portion 36 c is aligned with the central axis of the mounting hole 30. .

(Effects of Example)
Next, the operation of the pilot hole machining jig according to the above-described embodiment will be described in relation to the drilling method.

  When drilling a pilot hole for fixing the back cage 14 to the back surface of the game board 12 with screws, first, the flange 26 of the back cage 14 is in contact with the back surface of the game board 12 at a predetermined position on the back surface. (FIG. 9A). In this state, the projection 56 of the pilot hole processing jig 10 in which the punch member 34 is accommodated in the accommodation portion 36 of the holder 38 is fitted into the mounting hole 30 of the back collar 14 as shown in FIG. . At this time, the projection 56 formed in the corresponding tapered shape is guided along the tapered guide portion 32 formed on the insertion side of the mounting hole 30, so that the mounting hole of the projection 56 is provided. The fitting to 30 is performed smoothly and easily. As a result, the pin portion 48 b of the punch member 34 is positioned at an appropriate position with respect to the mounting hole 30 with respect to the drilling position of the game board 12.

  Further, as described above, the installation base portion 22 that protrudes in the direction away from the game board 12 is located in the vicinity of the mounting hole 30 formed in the flange 26 of the back cover 14, as shown in FIG. Thus, since the tip opening side of the holder 38 is a narrow column part 52 that is thinner than the gripping part 50, the holder 38 interferes with the installation base part 22, and the projection part 56 cannot be fitted into the mounting hole 30. There is nothing. Further, since the grip portion 50 is set to a thickness that allows the operator to securely and stably grip the grip portion 50, the pilot hole processing jig 10 is inserted into the game board with the projection portion 56 fitted in the mounting hole 30. 12 can be stably held perpendicular to the back surface.

  Next, the head 44 of the punch member 34 protruding from the holder 38 is struck with a hammer or the like while the pilot hole machining jig 10 is held perpendicularly to the flange 26 of the back rod 14, FIG. As shown in (c), the pin portion 48 b of the punch member 34 is driven into the back surface of the game board 12. At this time, since the punch member 34 is supported by the accommodating portion 36 of the holder 38, the punch member 34 moves straight, the pin portion 48b is driven perpendicularly to the game board 12, and the prepared hole 46 is inclined. The position does not shift. Further, since the radial clearance between the third support portion 36c and the pin portion 48b in the accommodating portion 36 of the holder 38 is set to be small, the radial blurring when the punch member 34 is hit with a hammer or the like is prevented. It is suppressed. Furthermore, when the punch member 34 is hit with a hammer or the like, the end of the first shaft portion 40 of the punch member 34 abuts on the stepped portion 54 formed inside the holder 38 and is regulated in position. A pilot hole 46 is formed in the game board 12 at a certain depth. That is, it is possible to prevent the pin portion 48b from being driven into the game board 12 more than necessary.

  After driving the pin portion 48b, the pilot hole machining jig 10 is pulled up, so that the pin portion 48b is removed from the game board 12 and the pilot hole 46 is formed (see FIG. 9D). At this time, the pin portion 48b may bite into the game board 12 to make it difficult to remove it. In this case, by slightly tilting the pilot hole processing jig 10, the pin portion 48b bites into the game board 12 is loosened, and the pin portion 48b can be easily pulled out. However, since the pin portion 48b is thin, it may be deformed when the pilot hole machining jig 10 is tilted. Therefore, in the pilot hole machining jig 10 of the embodiment, the pin portion 48b is deformed by pulling up after loosening the biting state by gripping and rotating the head 44 of the punch member 34 with a tool such as pliers. And can be easily pulled out from the game board 12. Further, since the flat surface 44a, 44a is formed in the head portion 44 so as to face in the radial direction, the tool does not slip when the punch member 34 is rotated by the tool, and the punch member 34 is surely secured. Can be easily pulled out of the pin portion 48b. As described above, the entire head 44 protrudes from the holder 38 with one end of the first shaft portion 40 of the punch member 34 in contact with the stepped portion 54 of the holder 38. 44 can be securely gripped.

  As described above, in the pilot hole machining jig 10 according to the embodiment, the narrow column portion 52 where the projection portion 56 is formed is made thinner than the grip portion 50, so the flange 26 where the attachment hole 30 is formed is small, Even if there is an obstacle near 30, the pilot hole processing jig 10 can be stably held at an appropriate position with respect to the drilling position. The range of applications that can be opened is expanded. Moreover, since the pin portion 48b of the punch member 34 can be accurately aligned with respect to the drilling position by using the mounting hole 30 of the back cover 14, it is not necessary to write a marking line, and the operation is easy. Become. Furthermore, since the protrusion 56 and the guide portion 32 of the attachment hole 30 are formed in corresponding taper shapes, the protrusion 56 can be easily aligned with the attachment hole 30 and work efficiency is improved.

  By positioning the back cage 14 on the back surface of the game board 12 having the pilot hole 46 drilled by the pilot hole processing jig 10 and screwing the screw 28 inserted into the pilot hole 46 through the mounting hole 30 into the game board 12, The back cage 14 is fixed to the game board 12. As described above, the pilot hole 46 is formed perpendicularly to the game board 12, so that the screw 28 is not screwed in diagonally or is not displaced. Further, in the prepared hole processing jig 10, as described above, the position of the punch member 34 is regulated by the step portion 54 and the first shaft portion 40 so that the prepared hole 46 having a certain depth can be formed. It has become. Accordingly, it is possible to prevent a situation in which the pilot hole 46 is formed too deep and the tightening force of the screw 28 becomes weak, or the screw 28 cannot be guided straight due to insufficient depth of the pilot hole 46.

  In the embodiment, since the punching member 48 is configured to be replaceable with respect to the punch member 34, when changing the depth of the pilot hole 46, a pin portion 48 b having a length corresponding to the punch member 34 is provided. This can be dealt with by simply mounting the drilling member 48 provided. That is, it is not necessary to prepare the punch member 34 for each depth of the pilot hole 46, and the cost can be reduced. In addition, if the tip of the pin portion 48b is worn and rounded over time, the pilot hole 46 cannot be drilled unless it is struck hard at the time of drilling the pilot hole. However, in the embodiment, only the drilling member 48 is replaced. As a result, the running cost can be reduced compared to replacing the entire punch member 34. In the case where the hard warp prevention plate 20 is provided at the drilling position as in the game board 12, the pin portion 48b is worn in a short period of time, so the effect of making the drilling member 48 replaceable is high.

[Example of change]
The pilot hole machining jig according to the present invention is not limited to the above-described embodiment, and various modifications can be made.
(1) The protrusion is not limited to the tapered shape, and may be cylindrical as long as it can be fitted into the mounting hole. Further, the protruding portion does not need to be present in the entire circumferential direction of the tip opening of the holder, and may be configured by a plurality of protruding pieces that are spaced apart by a predetermined interval in the circumferential direction.
(2) In the embodiment, the back cover is cited as the fixed object to be fixed to the game board with screws, but the fixed object is not limited to this, and any member having a mounting hole formed in advance may be used. .
(3) In the embodiment, the drilling member is configured to be detachable with respect to the second shaft portion, but a configuration in which the drilling member is integrally provided on the second shaft portion may be employed.

It is a vertical side view of the pilot hole processing jig which concerns on an Example. It is a side view of the prepared hole processing jig which concerns on an Example. It is a side view shown in the state which separated the holder and punch member of the pilot hole processing jig concerning an example, Comprising: A holder is shown longitudinally. It is a top view which shows the head of the punch member which concerns on an Example. It is a side view which partially fractures and shows the state which isolate | separated the punching member from the 2nd axial part of the punch member which concerns on an Example. It is principal part sectional drawing which shows the state which fitted the projection part of the pilot hole processing jig which concerns on an Example to the attachment hole of a back cover. It is a rear view which shows the game board in which a pilot hole is drilled with the pilot hole processing jig which concerns on an Example in the state which positioned the back hook on the back surface. It is principal part sectional drawing which shows the screwing location of a game board and a back cover. It is explanatory drawing which shows the process of making a pilot hole in a game board with the pilot hole processing jig which concerns on an Example.

Explanation of symbols

12 Game board 14 Uraban (fixed object)
28 Screw 30 Mounting hole 32 Guide part 34 Punch member 36 Housing part 38 Holder 44 Head part 46 Pilot hole 50 Gripping part 52 Narrow column part 56 Projection part

Claims (3)

The game board is provided with a rod-like punch member and a holder through which a receiving portion for slidably supporting the punch member is provided, and a pilot hole used for guiding a screw for fixing an object to be fixed to the game board is provided in the game board In the pilot hole processing jig, the holder is
A gripping portion provided on the head opening side of the housing portion from which the head of the punch member protrudes;
A narrow column portion that is provided between a tip provided with a tip opening of the housing portion from which the tip of the punch member protrudes and the grip portion, and is narrower than the grip portion;
A prepared hole processing jig comprising a protrusion provided around the tip opening and capable of being fitted into a mounting hole of the screw formed in the fixed object.   2. The pilot hole processing according to claim 1, wherein the protrusion is formed in a taper shape corresponding to a tapered guide portion that is formed on the insertion side of the protrusion in the mounting hole and expands toward the insertion side. Ingredients. A drilling method using the pilot hole processing jig according to claim 1 or 2,
Fit and align the protrusions of the holder with the mounting holes of the fixed object positioned on the game board,
By striking the head of the punch member protruding from the head opening of the holder, a pilot hole is made in a portion corresponding to the mounting hole in the game board at the tip protruding from the tip opening of the punch member. A drilling method characterized by

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