Punching tool

Abstract

The present invention provides a punching tool that can arbitrarily replace the front end portion that first contacts an object to be pierced, such as the ground, during use, and can firmly install the front end portion. The punching tool 1 includes a cylindrical front end portion 2 that first contacts an object, and a main body portion 3 at least part of which is cylindrical and is installed at one end of the front end portion 2, and the front end portion 2 is detachable relative to one end 32 of the main body portion 3. The main body portion 3 has an outer peripheral surface on the end portion 32 on the side where the front end portion 2 is installed, and the outer peripheral surface is provided with an external thread 36 that engages with the internal thread of the front end portion 2, and an incomplete screw portion is provided in the inner end area of ​​the external thread 36. The front end portion 2 is provided with a through threaded hole 26 in a portion opposite to a partial area of ​​the external thread 36, and when it is installed on the one end 32 of the main body portion 3, a headless stop screw 4 is embedded and fixed in the through threaded hole 26.

Description

Technical Field

[0001] The present invention relates to a punching tool, in particular to a punching tool which can perform operations such as punching, opening, demoulding, etc. by piercing into an object represented by the ground such as lawn, a substrate such as leather, etc. and then pulling out. Background Art

[0002] Conventionally, there are known drilling tools called drills that are used for operations such as drilling by piercing the ground such as lawn and then pulling it out. The tools described in the following Patent Documents 1 to 3 are known.

[0003] Patent document 1 describes a drill bit having a hollow cylindrical drill bit body with an opening at the front end of the body. An opening portion extending along the length direction of the drill bit body is formed on the circumferential surface of the drill bit body, and the opening portion has a circumferential angle of not less than 180 degrees and not more than 210 degrees with the central axis of the drill bit body as the center.

[0004] In addition, Patent Document 2 describes a drill bit for perforating lawns, which has a front end opening at the front end and a mounting portion for mounting on a sand loosening device at the bottom end; an insertion cylinder portion, which is roughly cylindrical and discharges lawn soil introduced into the front end opening from a side opening portion arranged on the side, and has an opening portion continuous with the front end opening portion arranged at the front end of the insertion cylinder portion; a cylindrical front end portion for cutting lawn soil, so that the outer peripheral portion of the cylindrical front end portion is in the shape of an annular protrusion; the edge of the front end of the protrusion is formed into a blade to play a cutting role; and a tubular cutting portion, which is larger in diameter than the soil to be cut by the cylindrical front end portion, thereby cutting the lawn soil.

[0005] Furthermore, patent document 3 describes a drill bit having a main body, a front end blade, and a plurality of spiral strips. The main body is provided with a discharge port by cutting off a portion of the side circumference of the barrel, the front end of the barrel has an opening, the front end blade is formed into a cone at the front end of the main body in a manner to narrow the above-mentioned opening, and the spiral strips protrude spirally from the above-mentioned opening along the inner circumference of the main body to the above-mentioned discharge port. When the main body penetrates the ground, the lawn introduced into the interior of the main body from the opening is twisted along the spiral strips, thereby cutting off the roots of the lawn with the front end blade.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2010-22297

[0009] Patent Document 2: Japanese Patent No. 4555194

[0010] Patent Document 3: Japanese Patent No. 6054573 Summary of the invention

[0011] Problems to be solved by the invention

[0012] In such conventional drilling tools, due to repeated operations of piercing an object such as the ground, the tip portion that first comes into contact with the object may be worn or partially damaged.

[0013] However, in this case, the conventional punching tool needs to be replaced as a whole including the front end portion thereof to solve the problem.

[0014] In addition, in previous punching tools, for example, when drilling holes in an object such as the ground, if the condition of the object such as the ground (lawn, etc.) or its geology, thickness, material and other conditions are different, from the perspective of performing the punching operation more appropriately and stably, it is sometimes necessary to change the material of the punching tool itself and the diameter and shape of the front end hole set in its front end part.

[0015] However, even in this case, the conventional punching tool has to be replaced as a whole including its front end portion to solve the problem.

[0016] The present invention provides a punching tool, which can be used after the front end part that first contacts with a punching object such as the ground is replaced arbitrarily and can be firmly installed on the front end part.

[0017] Means of solving problems

[0018] The punching tool of the present invention (1) comprises a cylindrical front end portion which first contacts an object, and a main body portion at one end of which the front end portion is mounted and at least a part of which is cylindrical.

[0019] The front end portion is detachably mounted on one end of the main body portion, and has an inner peripheral surface provided with an internal thread at the end portion mounted on one side of the main body portion.

[0020] The main body has an outer peripheral surface at the end portion on the side where the front end portion is installed, and the outer peripheral surface is provided with an external thread engaged with the internal thread, and an incomplete screw portion is provided in the inner end region of the external thread.

[0021] A through threaded hole is provided at a portion of the front end portion that is opposite to a portion of the external thread, and when mounted at one end of the main body portion, a headless set screw is inserted and fixed in the through threaded hole.

[0022] In addition, the punching tool of the present invention (2) is based on the punching tool of the above-mentioned invention (1), wherein the set screw has an adhesive attached to the screw head.

[0023] The punching tool of the present invention (3) is based on the punching tool of the above-mentioned invention (2), wherein the stop screw is a screw made of synthetic resin.

[0024] The punching tool of the present invention (4) is based on the punching tool of the above-mentioned invention (1), wherein the through threaded hole is provided at a position opposite to the incomplete screw portion.

[0025] The punching tool of the present invention (5) is based on the punching tool of the above-mentioned (1), wherein the incomplete screw portion is a portion that engages with a portion of the internal thread of the front end portion in an abnormal state, and the recessed portion of the external thread gradually becomes shallower in shape as it moves away from one end of the above-mentioned main body portion.

[0026] The punching tool of the present invention (6) is the punching tool of the present invention (1) above, wherein the Rockwell hardness of the tip portion is harder than the Rockwell hardness of the body portion.

[0027] The punching tool of the present invention (7) is based on the punching tool of the above-mentioned invention (1), and a hook hole for inserting the protrusion of the hook wrench is provided on the outer peripheral surface of the front end portion.

[0028] Furthermore, the punching tool of the present invention (8) is based on the punching tool of any one of the above inventions (1) to (7), and has multiple different types of front end portions, and the size and shape of the front end opening that first abuts against the object are different, or the material is different.

[0029] Effects of the Invention

[0030] According to the punching tool of the above invention (1), the front end portion is detachably mounted on one end of the main body portion, and when the front end portion is mounted on one end of the main body portion, it is fastened with a thread including an incomplete screw portion and fixed with a headless stop screw, so that the front end portion that first comes into contact with the punching object such as the ground can be replaced arbitrarily and used, and the front end portion can be firmly mounted.

[0031] Therefore, in this punching tool, for example, even if the tip of the punching tool is worn or partially damaged due to repeated piercing operations into an object such as the ground, the problem can be solved by replacing the tip with a new one.

[0032] In addition, in this punching tool, for example, even if the condition of the object such as the ground and its geology, thickness, material and other conditions are different when piercing into the ground, the problem can be solved by replacing the front end with a material and shape suitable for the condition and conditions of the object.

[0033] Furthermore, in the punching tool, when the front end is mounted on one end of the main body, the threaded fastening including the incomplete screw portion and the fixing with the headless stop screw are used, so the fastening state of the internal thread and the external thread is not easy to loosen due to the cooperative fixing action of the incomplete screw portion and the stop screw. Finally, the punching tool can maintain the state in which the front end is firmly mounted on the main body, and the punching operation can be performed stably. In addition, the stop screw can be embedded in the screw hole without protruding from the outer surface of the front end, and will not become an obstacle during the punching operation.

[0034] According to the above invention (2), the screw head of the set screw is firmly fixed to the external thread by the adhesive, and the tip portion can be more firmly attached to the main body.

[0035] According to the invention (3), since the set screw is made of synthetic resin, it is relatively easy to manufacture even if it is small in size. In addition, even if it is difficult to loosen the set screw temporarily when removing the front end portion, the set screw can be loosened while the front end portion is heated, or the set screw itself can be destroyed to solve the problem.

[0036] According to the invention (4), the set screw is pressed on the incomplete screw portion, and the front end portion can be fixed to the main body more firmly. In addition, the external thread portion other than the incomplete screw portion will not be deformed due to the pressing of the front end of the set screw thread.

[0037] According to the above invention (5), the incomplete screw portion having a relatively simple structure can make it difficult for the fastening screws of the front end portion and the main body portion to loosen.

[0038] According to the invention (6), the durability of the front end portion can be ensured and the disassembly operation of the front end portion can be facilitated.

[0039] According to the invention (7), when the front end portion is disassembled, the internal thread and the external thread can be tightened and unscrewed simply and firmly without damaging the front end portion.

[0040] According to the above invention (8), a tip end portion of a type suitable for the state and condition of the object can be selected, and the suitable tip end portion can be mounted on the main body for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1A This is a perspective view of the punching tool according to the first embodiment in a combined state.

[0042] Figure 1B It is a perspective view showing an exploded state of the punching tool according to the first embodiment.

[0043] Figure 2 yes Figure 1A A side view of an exploded state of a punching tool.

[0044] Figure 3A yes Figure 1B A partial cross-sectional side view of one end of the mid-body portion.

[0045] Figure 3B yes Figure 1B A schematic cross-sectional view of the front end.

[0046] Figure 4 yes Figure 3A A side view of one end of a central body portion and an enlarged cross-sectional side view of a portion of the end.

[0047] Figure 5 yes Figure 3B Schematic diagram of the front end and the set screw.

[0048] Fig. 6A It is a partial cross-sectional side view showing a state in which the front end portion is being mounted on the main body or in which the front end portion is being removed from the main body.

[0049] Figure 6B It is a partial cross-sectional side view showing a state in which the front end portion is completely mounted on the main body portion.

[0050] Fig. 7A This is a schematic front view of a hook wrench used when removing the front end of the punch tool from the main body.

[0051] Figure 7B yes Fig. 7A A schematic perspective view of an example of a hook wrench in use.

[0052] Fig. 8A This is a partial cross-sectional schematic diagram of an example of a bracket installed when using a punching tool.

[0053] Figure 8B yes Fig. 8A A partial cross-sectional schematic diagram showing the state of the punching tool being installed on the bracket when in use.

[0054] Fig.9A This is a diagram showing another example of a method of disassembling the front end portion, and is a schematic perspective view of the striking operation state when the front end portion is disassembled.

[0055] Fig. 9B This is another example of a disassembly method for the front end portion. Fig.9A A schematic three-dimensional view of a state in which the front end portion is removed from the main body after the striking operation.

[0056] Fig. 10A This is a schematic cross-sectional view of the front end portion of a modified example of the punching tool.

[0057] Fig. 10B yes Fig. 10AA partial cross-sectional side view of the usage state when the front end portion is installed on the main body.

[0058] Fig.11A This is a diagram of another modified example of the punching tool, and is a partial cross-sectional schematic diagram of an example of a punching tool having two types of front end portions having different sizes of front end openings and different lengths of the front end portions.

[0059] Fig. 11B is a diagram of another modified example of the punching tool, Fig.11A A schematic front view of an example of two types of front end portions. DETAILED DESCRIPTION

[0060] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0061] [Implementation Method 1]

[0062] Figure 1A , Figure 1B and Figure 2 Detailed Description of the Invention A punching tool according to Embodiment 1 of the present invention is shown in FIG.

[0063] like Figure 1A , Figure 1B and Figure 2 As shown, the punching tool 1 of embodiment 1 comprises: a front end portion 2 that first abuts against the punching object; a main body portion 3 having one end for mounting the front end portion 2, and the structure of the front end portion 2 is detachable relative to one end of the main body portion 3.

[0064] The punching tool 1 is configured as a punching tool, that is, a so-called drill, and is used for operations such as drilling holes by piercing the ground such as a lawn or the like, for example, and then pulling it out.

[0065] The front end portion 2 of the punching tool 1 is a portion having a thin cylindrical shape and is made of, for example, a metal material.

[0066] like Figure 1A and Figure 3B As shown in the figures, the front end portion 2 includes: a main body 21, which is composed of a thin and hollow cylindrical shape; a front port 22, which is arranged at the end (front end) on the side of the main body 21 that first abuts against the object; a connecting port 23, which is installed at the end (rear end) on one side of the main body 3 in the main body 21; and a through space 24, which passes through the inside of the main body 21 from the front port 22 to the connecting port 23.

[0067] In addition, if Figure 3B As shown in FIG. 1 and FIG. 2 , the front end portion 2 is provided with an internal thread 25 in a portion of the inner peripheral surface 21 b extending from the connection port 23 of the main body 21 into the through space 24 .

[0068] Furthermore, if Figure 1B and Figure 3B As shown in FIG. 1 and FIG. 2 , the front end portion 2 has an outer peripheral surface 21 a of a main body 21 thereof, and is provided with a through screw hole 26 into which a headless set screw 4 is inserted, and a hook hole 28 into which a protrusion 63 of a hook wrench 6 described later is inserted.

[0069] The main body 3 of the punching tool 1 is a portion having a substantially cylindrical shape in appearance and is made of, for example, a metal material.

[0070] like Figure 1B and Figure 2 As shown in the figures, the main body 3 includes: a main body 31, which is composed of a hollow roughly cylindrical shape; a cylindrical assembly portion 32, which is arranged at the end of the main body 31 on the side connected to the installation front end portion 2; a mounting portion 33, which is provided in order to install mounting components or mounting devices such as brackets at the end of the main body 31 on the opposite side of the assembly portion 32 when using the punching tool 1; a through space 34, which passes through the inside of the main body 31 from the assembly portion 32 to the mounting portion 33; and an opening portion 35, which is provided by cutting a groove in a part of the main body 31 along the length direction.

[0071] In addition, the main body 3 is as follows Figure 1B to Figure 3A As shown, an external thread 36 is provided on the outer peripheral surface of the fitting portion 32 at one end thereof. The external thread 36 is a screw that engages with the internal thread 25 of the front end portion 2.

[0072] The main body 31 of the main body portion 3 is as follows Figure 1B or Figure 3A As shown, it is a substantially cylindrical structure having a required length, a required outer diameter K and an inner diameter E1.

[0073] In addition, the assembly portion 32 of the main body portion 3 is as shown in FIG. Figure 1B or Figure 3A As shown in FIG. 1 , the cylindrical portion is formed by protruding from one end of the main body 31 by a predetermined length M1 and having an outer diameter E3 and an inner diameter E1. The mounting portion 32 is formed by cutting one end of the main body 31 by cutting, for example. Therefore, the outer diameter E3 of the mounting portion 32 is smaller than the outer diameter K of the main body 31 before processing (E3 <K)。

[0074] On the mounting portion 32, an external thread 36 is formed with a required screw length WI at approximately the center of the outer peripheral surface of the length M1. In addition, on the mounting portion 32, a groove-shaped outer peripheral surface 32a on which the external thread 36 is not formed is provided between the external thread 36 and the end of the main body 31. Furthermore, on the mounting portion 32, a cylindrical outer peripheral surface 32b on which the external thread 36 is not formed is provided on the opposite side of the outer peripheral surface 32a of the external thread 36. In addition, one end of the mounting portion 32 is open, constituting one end of the through space 34 of the main body 31. Figure 1B and Figure 3AThe symbol 32c among others indicates the opening of the fitting part 32.

[0075] Both the outer peripheral surface part 32a and the outer peripheral surface part 32b in the fitting part 32 are Figure 3A as shown, composed of cylindrical surfaces, and the outer diameter E2 (<E3) is smaller than the original outer diameter E3 of the fitting part 32. In addition, except for the incomplete screw part 37 described later, the depth of the concave part between the thread protrusions roughly reaches the position of the above-mentioned outer diameter E2, forming an external thread 36.

[0076] In addition, as Figure 1B or Figure 3A shown, a height difference is generated between the main body 31 of the main body part 3 and the outer peripheral surface part 32a, and the wall surface part formed by this height difference constitutes the wall surface part 38, which contacts and blocks the rear end part of the front end part 2.

[0077] The structure of the mounting part 33 of the main body part 3 is as Figure 1B and Figure 2 shown, directly using the area of the other end part of the main body 31 composed of a hollow cylindrical shape, and a through hole 39 for allowing a fixing member 7 ( Fig. 8A ) such as a bolt described later to pass through is provided on a part of it.

[0078] Furthermore, as Figure 4 shown enlarged, the screw part including the complete screw part 360 and the incomplete screw part 37 constitutes the external thread 36 of the main body part 3.

[0079] The incomplete screw part 37 is provided in the end part area of the thread length W1 of the external thread 36 that is far from the end part on the side where the front end part 2 to which the main body part 3 is mounted is located. The shape structure of the incomplete screw part 37 in Embodiment 1 becomes shallower as the concave part 36b between the protrusions 36a of the external thread 36 moves away from the above-mentioned end part of the main body part 3. Figure 4 The double-dashed line d shown within the circle of the single-dashed line is an imaginary line that respectively passes through the bottoms of the adjacent concave parts 36b in the incomplete screw part 37.

[0080] Such an incomplete screw part 37 is formed, for example, within a range corresponding to 2 to 3 pitches of the external thread 36.

[0081] On the other hand, the main body 21 of the front end part 2 is Figure 1B or Figure 3B as shown, a cylindrical structure body with a required length L and an end part having a connection port 23 is composed of an outer diameter K.

[0082] In addition, the main body 21 has a through space 24 formed by a plurality of inner diameters. Among them, when the front end portion 2 is mounted on the main body portion 3 in the main body 21, the inner diameter E4 of the portion where the fitting portion 32 of the main body portion 3 is inserted is substantially the same as the outer diameter E2 of the fitting portion 32. And, in the main body 21, the portion where the fitting portion 32 of the main body portion 3 is inserted is formed as a cylindrical inner peripheral surface formed by a length N1 substantially the same as the length M1 of the fitting portion 32.

[0083] As Figure 3B shown, in the portion where the fitting portion 32 of the main body portion 21 is inserted, an internal thread 25 is formed from the connection port 23 with a required length W2. The internal thread 25 is formed by thread protrusions connected in a spiral shape with a required pitch. Figure 3B The double-dashed line in

[0084] In addition, in the portion where the fitting portion 32 of the main body 21 is inserted, as Figure 3B shown, on the inner side (the side with the front end port 2) relative to the internal thread 25, a circular inner peripheral surface portion 27 into which at least a part of the cylindrical outer peripheral surface portion 32b of the fitting portion 32 of the main body portion 3 is inserted is provided. The inner peripheral surface portion 27 is formed, for example, by a portion with a required length of M2.

[0085] In addition, the front end port 22 of the main body 21 is formed as a circular opening portion with a required aperture D. Since the front end port 22 is formed at the slender front end of the main body 21, the aperture D of the front end port 22 is smaller than the inner diameter E4 of the connection port 23 on the opposite side of the front end port 22 (D < E4). In addition, regarding the front end port 22, the cross section of its edge portion is formed in a slender shape like a sharp edge.

[0086] As Figure 3B shown, the through space 24 on the side of the front end port 22 of the main body 21 is formed as a continuous cylindrical space, and the inner diameter is the same as the aperture D of the front end port 22. However, the through space 24 on the side of the front end portion 22 is not limited to this manner. For example, in order to substantially follow the slender shape in the appearance of the main body 21, it may also be formed as a space with an inner peripheral surface shape whose inner diameter gradually changes.

[0087] In addition, the through threaded hole 26 in the front end portion 2 is integrally formed in a portion of the outer peripheral surface 21a of the front end portion 2 that faces a part of the external thread 36 of the main body portion 3. As Figure 5 shown, the through threaded hole 26 in Embodiment 1 is formed as a hole that penetrates to the internal thread 25 with a required aperture in a portion that faces a part of the complete screw portion 360 in the external thread 36. In this threaded hole 26, a thread protrusion (internal thread 26c) for engaging with the set screw 4 (external thread 41c) is formed by a tap.

[0088] The headless set screw 4 embedded in the through threaded hole 26 is only provided by Figure 5 The set screw 4 is composed of a headless screw shaft 41 as shown in the figure. The set screw 4 has a required external thread 41c formed on the outer peripheral surface of the threaded shaft 41. The length H of the set screw 4 is inserted into the through threaded hole 26, and the length is such that the screw head 41a reaches the external thread 36 of the main body 3. This set screw 4 is formed by using a synthetic resin material such as epoxy resin and screw processing.

[0089] In addition, the through stop screw 4 is as Figure 5 As shown in the enlarged view, the screw head 41a is pre-attached with adhesive 45, and on the other hand, a tool groove 43 for inserting a screwing tool is provided on the rear end 41b. The shape of the screw head 41a can be a flat tip, but it can also be a shape other than this. In addition, the shape of the tool groove 43 can be a flat-shaped (linear groove) of a flat-shaped screwdriver, but it can also be a shape other than this. For the adhesive 45, an adhesive that can be used can at least be bonded to the external thread 36 on the main body 3, and has the performance of fixing the stop screw 4 to the extent that it does not rotate during the insertion operation, etc.

[0090] The set screw 4 may be detachable from the front end portion 2 as an accessory, or may be pre-engaged in the threaded hole 26 of the front end portion 2 to a certain extent.

[0091] Furthermore, the hook hole 28 on the outer peripheral surface 21a of the front end portion 2 is formed integrally with the inner peripheral surface 21b provided with the internal thread 25 at a portion close to the front end 22. The hook hole 28 may be formed, for example, so that a Fig. 7A The protrusion 63 of the hook wrench 6 shown has a hole diameter or a hole depth.

[0092] The hook spanner 6 is a kind of fastening tool. Fig. 7A As shown in FIG. 1 , the hook wrench 6 is composed of action parts 61 and 62 provided at both ends of a plate-like member 60 in a shape bent inwardly concavely, and protrusions 63 and 64 provided protrudingly at one end of the action parts 61 and 62. The action parts 61 and 62 are curved in arcs with curvature radii R1 and R2 set according to the size of the object to be fastened. The hook wrench 6 is not limited to this structure, and for example, there may be only one action part.

[0093] In addition, in the punching tool 1 , the Rockwell hardness of the tip portion 2 is harder than the Rockwell hardness of the body portion 3 .

[0094] The Rockwell hardness is a Rockwell hardness (HRC) measured using a Rockwell hardness tester (manufactured by FUTURE-TECH Co., Ltd.: FR series). Specifically, the Rockwell hardness of the tip portion 2 is measured using the above-mentioned Rockwell hardness tester with a model number of FR1L, and the Rockwell hardness of the main body 3 is measured using the above-mentioned Rockwell hardness tester with a model number of FR-1.

[0095] The Rockwell hardness of the front end portion 2 can be such that cracks easily appear when the front end portion 2 is naturally dropped from a height of about 30 cm and struck with a hammer or other striking tool (with a weight of 1 to 2 pounds) 65 (see Fig.9A On the other hand, the Rockwell hardness of the main body 3 is the same as that of the front end 2, and only needs to be a hardness that does not cause cracks or is difficult to cause cracks when struck with a striking tool 65 such as a hammer.

[0096] In the first embodiment, the Rockwell hardness of the tip portion 2 is set within a range of 59 to 64, and the Rockwell hardness of the body portion 3 is set within a range of 50 to 56.

[0097] When the Rockwell hardness of the tip 2 is less than 59, the durability of the drilling operation is likely to be reduced and the product life is likely to be shortened. On the contrary, when the Rockwell hardness of the tip 2 exceeds 64, the toughness is reduced and the tip becomes brittle, which is likely to be damaged during the drilling operation.

[0098] Regarding the Rockwell hardness of the tip portion 2 and the main body 3, for example, it is preferable that the Rockwell hardness is within the above range even if the outer diameter and thickness (wall thickness) of the tip portion 2 and the main body 3 are different. In addition, it is more preferable that the Rockwell hardness of the tip portion 2 is set within the range of 60 or more and 61 or less, and the Rockwell hardness of the main body 3 is set within the range of 51 or more and 53 or less.

[0099] Furthermore, in the punching tool 1, the front end portion 2 is attached to and detached from the main body portion 3 in the following manner.

[0100] First, when installing the front end 2, Fig. 6A As shown, after the connection port 23 of the front end portion 2 is brought close to the fitting portion 32 of the main body portion 3 , the front end portion 2 is operated so as to be rotated in the screw tightening direction.

[0101] At this time, in the initial stage, the internal thread 25 of the front end portion 2 and the external thread 36 of the main body portion 3 are completely screwed together. Figure 4 ) engages without obstruction, and the front end portion 2 moves in a manner close to the main body 3 through the engagement of the screw.

[0102] Next, when the internal thread 25 of the front end portion 2 reaches the incomplete screw portion 37 of the external thread 36 of the main body portion 3, due to the different shapes of the thread recesses of the internal thread 25 and the incomplete screw portion 37, they do not bite in a normal state and encounter resistance and are difficult to move.

[0103] After this stage, if Figure 7B As shown, the installation work is performed using the hook spanner 6. That is, in this case, the protrusion 63 of the corresponding action part 61 of the hook spanner 6 is inserted into the hook hole 28 of the front end part 2, and the action part 61 is in close contact with the outer peripheral surface of the front end part 2, and the hook spanner 6 is rotated in the direction P required for tightening.

[0104] As a result, the front end portion 2 is rotated by the strong tightening action of the hook wrench 6, so that a stronger driving force is obtained at the engagement point of the fully screwed portion 360 of the internal thread 25 and the external thread 36.

[0105] Finally, the front end 2 is Figure 6B As shown, the internal thread 25 on the front end portion 2 is forced to pass over the incomplete screw portion 37 of the external thread 36 on the main body portion 3.

[0106] In addition, the front end portion 2 at this time finally Figure 6B As shown, the edge of the connection port 23 contacts the wall surface 38 which has a height difference with the mounting portion 32 in the main body 3 and stops.

[0107] At this time, a portion of the incomplete screw portion 37 of the internal thread 25 of the front end portion 2 that first passes over the external thread 36 of the main body portion 3 is in a state of facing the groove-shaped outer peripheral surface 32a of the mounting portion 32 of the main body portion 3. In addition, at this time, the inner peripheral surface 27 of the front end portion 2 is slightly fitted with the cylindrical outer peripheral surface 32b of the fitting portion 32 of the main body portion 3. Furthermore, at this time, the through space 24 at the front end portion 2 and the through space 34 at the main body portion 3 are connected to each other and are in a continuous state.

[0108] Finally, the headless set screw 4 is tightened by turning it with a screwdriver and inserted into the through screw hole 26 in the front end portion 2 connected to the main body 3. The set screw 4 is installed with its screw head 41a abutting against the external thread 36 in the fitting portion 32 of the main body 3.

[0109] At this stage, the state of the stop screw 4 is as follows Figure 6B As shown, the set screw 4 is embedded in the threaded hole 26 that penetrates the entire body, and does not protrude from the outer peripheral surface 21a of the front end portion 2. In addition, the set screw 4 at this time is bonded to the external thread 36 by the adhesive 45 on the screw head 41a, and is kept in a state that is difficult to rotate.

[0110] Thus, the front end portion 2 is fixed to the fitting portion 32 (strictly speaking, a part of the external thread 36) of the main body portion 3 by the set screw 4. In addition, at this time, the set screw 4 of the front end portion 2 is fixed to a part of the external thread 36 by the adhesive 45, so that it is more firmly fixed to the fitting portion 32 of the main body portion 3.

[0111] Therefore, if Figure 1A or Figure 6B As shown, the front end portion 2 is seamlessly mounted on the main body portion 3, and the two are integrated. That is, by integrating the front end portion 2 and the main body 3, the punching tool 1 is assembled.

[0112] In this way, the front end portion 2 of the punching tool 1 can be easily installed on the main body 3 through the engagement of the internal thread 25 and the external thread 36 .

[0113] In addition, since at least a portion of the internal thread 25 of the front end portion 2 is forcibly engaged with the incomplete screw portion 37 of the external thread 36 in an abnormal state to be installed to constitute the punching tool 1, the structure of the front end portion 2 is difficult to be separated from the main body 3. Moreover, in the punching tool 1, since the screw fastening including the incomplete screw portion 37 and the headless set screw 4 are used when the front end portion 2 is installed on the installation portion 32 of the main body 3, the fastening state of the internal thread 25 of the front end portion 2 and the external thread 36 of the main body 3 is not easy to loosen due to the cooperative fixing action of the incomplete screw portion 37 and the set screw 4, and the front end portion 2 is maintained in a state of being firmly installed on the main body 3.

[0114] Thus, since the front end portion 2 of the punching tool 1 is firmly mounted on the main body 3, the punching operation can be performed stably. In addition, for the punching tool 1, even if the front end portion 2 is used in contact with an object and the screw begins to loosen, the presence of the meshing portion between the internal thread 25 and the incomplete screw portion 37 prevents the front end portion 2 from turning in the direction of the screw loosening, eliminating the risk of the front end portion 2 falling off from the main body 3.

[0115] Furthermore, even if the incomplete screw portion 37 is not present in the structure of the punching tool 1, the hook wrench 6 can be used to install the front end portion 2 on the main body 3, thereby, the installation work will not damage the outer peripheral surface of the front end portion 2 and can be carried out very conveniently.

[0116] Next, when the front end portion 2 is disassembled, first, the set screw 4 is loosened and left in the through threaded hole 26 , or is completely removed from the threaded hole 26 .

[0117] As a result, the fixing state of the set screw 4 with respect to the main body 3 of the distal end portion 2 is partially released.

[0118] Then, if Figure 7BAs shown, this can be done by rotating the front end portion 2 in the direction of loosening the screw using a hook wrench 6.

[0119] As a result, the front end portion 2 is rotated by the strong rotational action of the hook wrench 6, so that a stronger driving force is obtained at the engagement point between the internal thread 25 and the fully screwed portion 37 of the external thread 36.

[0120] Finally, the front end 2 is Figure 6B As shown, the internal thread 25 advances over the incomplete screw portion 37 of the external thread 36 in the main body 3 .

[0121] Therefore, if Figure 1B As shown, the tip portion 2 of the punching tool 1 is removed from the main body 3 and is in a disassembled state.

[0122] In this way, the front end portion 2 can be easily removed from the main body portion 3 by loosening the set screw 4 and releasing the engagement between the internal thread 25 and the external thread 36 .

[0123] Furthermore, even if the incomplete screw portion 37 is not present in the punching tool 1 , the tip portion 2 can be easily removed from the main body 3 by using the hook wrench 6 .

[0124] Moreover, for example Figure 8B As shown, the punching tool 1 is used in a state of being mounted on a supporting member 5 such as a bracket.

[0125] like Fig. 8A As shown, in the support member 5 shown in FIG. 8 , a mounting hole 51 is provided on the support body 50 formed of a desired shape, into which the mounting portion 33 of the main body 3 of the sashimi 1 is embedded.

[0126] Since the mounting portion 33 of the punching tool 1 is a hollow cylindrical portion, the mounting hole 51 is a cylindrical hole having a cylindrical support portion 52 formed in the center. Fig. 8A As shown in FIG. 5 , only one mounting hole 51 is provided for the supporting member 5 , but a plurality of mounting holes 51 are generally provided for the supporting member 5 .

[0127] The support member 5 is further provided with a fixing hole 53 , into which a fixing member 7 is inserted and fixed. The fixing member 7 is used to fix the mounting portion 33 of the punching tool 1 mounted on the mounting hole 51 .

[0128] Furthermore, the support member 5 is provided with a mounting support post 55 for mounting the support member 5 to which the boring tool 1 is mounted on a device such as a drilling machine (not shown) that actually moves.

[0129] The fixing hole 53 is a hole that penetrates the mounting hole 51 and faces the support portion 52. The fixing hole 53 is provided at a position facing the through hole 39 in the mounting portion 33 of the punching tool 1. When the fixing member 7 is a screw, an internal thread is formed in the fixing hole 53.

[0130] In addition, as the fixing member 7, for example, a screw or the like is suitable. Fig. 8A The fixing member 7 shown is composed of a screw portion 71 formed with an external thread and a head portion 72 having a larger diameter than the screw portion 71 .

[0131] When the punching tool 1 is mounted on the supporting member 5, as shown in FIG. Figure 8B As shown, the mounting portion 33 of the punching tool 1 is inserted into the mounting hole 51. At this time, the support portion 52 in the mounting hole 51 enters the inner space (through space 34) of the mounting portion 33.

[0132] Next, the fixing member 7 is inserted from the fixing hole 53 of the supporting member 5 , passed through the through hole 39 of the mounting portion 33 of the boring tool 1 , and pressed against the support portion 52 .

[0133] Therefore, if Figure 8B As shown, the punching tool 1 is mounted in the mounting hole 51 of the support member 5. In addition, the support member 5 to which the punching tool 1 is mounted is mounted on a device such as a drilling machine (not shown).

[0134] When the punching tool 1 is removed from the supporting member 5 , the fixing member 7 can be removed or loosened to easily remove the punching tool 1 from the mounting hole 51 of the supporting member 5 .

[0135] Moreover, when using Figure 8B As shown, the punching tool 1 is used by first bringing the distal end portion 2 into contact with the object 100 and then moving the punching tool 1 in a manner of piercing and then withdrawing the punching tool 1.

[0136] For example, when the object 100 is a lawn or other ground, the punching tool 1 can be used to perform a punching operation on the lawn of the object 100. Incidentally, when performing the punching operation, in the punching tool 1, the roots or soil of the lawn that enter the front port 22 of the front end portion 2 enter the through space 34 of the main body portion 3 through the through space 24 of the front end portion 2, and after moving in this direction, are finally discharged to the outside through the opening 35.

[0137] Furthermore, by repeatedly piercing the object 100 such as the ground, the tip portion 2 of the boring tool 1 that first comes into contact with the object 100 may be worn or partially damaged.

[0138] In this case, the front end 2 of the punching tool 1 can only be removed from the main body 3 and replaced with a new front end 2. In addition, the replacement operation can be performed on the punching tool 1 in a state installed on the support member 5 without removing the punching tool 1 from the support member 5.

[0139] In addition, after the punching tool 1 is used for piercing work, the front end 2 is sometimes difficult to remove. The front end 2 is difficult to remove because it is difficult to loosen the set screw 4, or the front end 2 is deformed by use, and the bite force of the external thread 36 is stronger than the initial stage, and finally it is difficult to loosen the bite of the screw even if the hook wrench 6 is used to rotate the front end 2.

[0140] However, in the punching tool 1, if Fig.9A As shown, by striking with a striking tool 65 such as a hammer from a height of about 30 cm, the front end portion 2 can be easily removed from the main body 3. That is, since the Rockwell hardness of the front end portion 2 of the punching tool 1 is relatively higher than that of the main body 3, cracks 67 are easily formed by the striking. Fig.9A The reference numeral 65a in FIG. 1 denotes a hammer head, and the reference numeral 65b denotes a handle having a grip.

[0141] Therefore, due to the existence of the crack 67, the stop screw 4 becomes loose or the engagement of the screw becomes loose, so that Fig. 9B As shown, it can be easily removed from the main body 3. By the way, since the stop screw 4 is a synthetic resin screw, when it is difficult to loosen, it can be solved by heating its front end 2 or the like to loosen the stop screw 4, or by destroying the stop screw 4 itself.

[0142] Therefore, when the punching tool 1 is used, even if the front end portion 2 is worn or partially damaged, it is not necessary to replace the entire punching tool 1 including the front end portion 2. In addition, when replacing, since the punching tool 1 can be installed on the support member 5, it is not necessary to remove the punching tool 1 from the support member 5.

[0143] Furthermore, when the punching tool 1 is used, even if the tip portion 2 is difficult to remove, the tip portion 2 can be easily removed from the main body 3, so that the tip portion 2 can be easily replaced.

[0144] [Implementation Method 2]

[0145] exist Fig. 10A and Fig. 10B , a punching tool 1 according to a second embodiment is shown.

[0146] The drilling tool 1 according to Embodiment 2 is composed of the same structure as the drilling tool 1 according to Embodiment 1, except that the front end portion 2B is changed and a through threaded hole 26 is provided at a position opposite to the incomplete screw portion 37 in the external thread 36 of the main body portion 3.

[0147] In the case of this drilling tool 1, when the front end portion 2B is attached to the main body portion 3, as Fig. 10B shown, since the set screw 4 is inserted into the through threaded hole 26 in a state of being pressed against the incomplete screw portion 37 of the external thread 36, the front end portion 2B can be more firmly fixed to the main body portion 3.

[0148] Therefore, in the drilling tool 1 to which this front end portion 2B is applied, the front end portion 2B can be more firmly fixed to the main body portion 3 and maintained in a state where it is more difficult to come off. In addition, in this case, the portion of the external thread 36 other than the incomplete screw portion 37 is not deformed by the pressing of the screw head 41a of the set screw 4.

[0149] [Embodiment 3]

[0150] Fig.11A The drilling tool 1 according to Embodiment 3 is shown.

[0151] The drilling tool 1 according to Embodiment 3 is composed of the same structure as the drilling tool 1 according to Embodiment 1, except that it is provided with different types of front end portions 2C and 2D having different opening sizes of a plurality of (two in this example) front ports 22. Fig.11A As shown, the drilling tool 1 having a plurality of front end portions 2C and 2D prepared in advance can form a drilling tool kit. In this drilling tool kit, there is one main body portion 3, which is shared by the front end portions 2C and 2D.

[0152] The front end portion 2C shown in

[0153] Fig.11A has a circular front port 22 formed by a hole diameter D1, and the length of the front end portion 2C is formed by a specified length L1. On the other hand, Fig.11A the front end portion 2D shown in

[0154] has a circular front port 22 formed by a hole diameter D2 (>D1) larger than the above-mentioned hole diameter D1, and the length of the front end portion 2D is formed by a length L2 (<L1) shorter than the above-mentioned length L1.

[0155] In the punching tool 1 having the plurality of front end portions 2C and 2D, the size of the front port 22 and the like of the front end portions 2C and 2D can be selected to match the state and condition of the object 100, and the punching tool 1 can be used after being mounted on the main body 3. In addition, the front end portions 2C and 2D can be replaced during use.

[0156] In addition, the punching tool 1 involved in the third embodiment, as Fig. 11B As shown, the punching tool 1 according to the first embodiment has the same structure as that of the punching tool 1 according to the first embodiment except that a plurality of (two in this example) different types of front end portions 2E and 2F having different opening shapes of the front ports 22 are provided.

[0157] The punching tool 1 having the plurality of tip portions 2E and 2F in advance can also be configured as a punching tool kit.

[0158] Fig. 11B The front end 2E shown has a circular front port 22E. On the other hand, Fig. 11B The front end portion 2F shown has a quadrilateral front port 22F.

[0159] The front end portion 2E and the front end portion 2F differ only in the shape of the front port 22 , and have the same structure except for that.

[0160] In the punching tool 1 having a plurality of tip portions 2E, 2F, the shapes of the opening holes 2E, 2F of the tip portions 2E, 2F can be selected to match the state and condition of the object 100, and the punching tool 1 can be used after being mounted on the main body 3. In addition, the tip portions 2E, 2F can be replaced during use.

[0161] [Modifications]

[0162] The present invention is not limited at all to the structural examples of the punching tool 1 according to the above-mentioned first to third embodiments, and includes, for example, the following modified examples.

[0163] For example, the incomplete screw portion 37 in the drilling tool 1 is not limited to the structure example of the first embodiment, and other structures for forming the incomplete screw portion may be applied.

[0164] The front end portion 2 can also be rotated manually or by using other tools without using the hook spanner 6 when it is disassembled. In this case, for example, the hook hole 28 provided on the outer peripheral surface 21a of the front end portion 2 can be omitted. In addition, as long as there is no concern about deformation of the threaded protrusion (internal thread) 26c of the through threaded hole 26, the threaded hole 26 can be used instead of the hook hole of the hook spanner 6. On the other hand, in the case where the hook hole 28 is provided, the conditions such as the position of the hook hole 28 can be arbitrarily changed.

[0165] In addition, the front end portion 2 may also omit the inner peripheral surface 27 into which the cylindrical outer peripheral surface 32b of the fitting portion 32 in the main body 3 fits. In this case, the operation without providing the inner peripheral surface 27 is

[0166] In addition, the headless set screw 4 can also be made of materials such as metal other than synthetic resin. However, it is preferably made of synthetic resin. In addition, the tool groove 43 in the set screw 4 can also be formed into a groove shape (positive shape, hexagonal hole, etc.) corresponding to other screwing tools.

[0167] Furthermore, the set screw 4 may be one in which the adhesive 45 is not attached to the screw head 41 a, but it is preferable to use one in which the adhesive is attached.

[0168] In addition, the main body 3 of the punching tool 1 may also have other forms of structure as long as it has a mounting portion 32 for mounting the front end portion 2. The front end portion 2 may also have a structure in which its outer diameter is increased, for example, by increasing the wall thickness of the portion where the internal thread 25 is formed. When this structure is adopted, the portion where the internal thread 25 is formed in the front end portion 2 can be protected, and in addition, the main body 3 (the mounting portion 32, etc.) can be protected.

[0169] The mounting portion 33 of the main body 3 is not limited to the configuration example illustrated in the first embodiment, and may be configured by other configurations, for example, in consideration of the mounting form corresponding to the support member 5 or the like to which the punching tool 1 is mounted.

[0170] Furthermore, the punching tool including a plurality of distal end portions 2 may include a plurality of different types of distal end portions having different opening sizes and shapes of the distal ends 22 .

[0171] Furthermore, the punching tool including a plurality of tip portions 2 may include a plurality of different types of tip portions, wherein the plurality of tip portions 2 of the tip portion are made of different materials.

[0172] In addition, the punching tool 1 can also be used to perform hole punching or demolding operations on an object 100 made of a base material such as leather. In addition, the support member 5 for mounting the punching tool 1 is not limited to the structure described in the first embodiment, and can of course be other structures including commercial products that can mount the punching tool 1.

[0173] Description of Reference Numerals

[0174] 1… Punch tool

[0175] 2. 2B…Front end

[0176] 2C, 2D, 2E, 2F...Multiple front ends

[0177] 3…Main body

[0178] 4…Set screw without head

[0179] 6…Hook wrench

[0180] 25…Internal thread

[0181] 26…Through screw holes

[0182] 36…External thread

[0183] 37…Incomplete screw part

[0184] 45…Adhesive

[0185] 100…objects

Claims

1. A punching tool comprising a cylindrical front end portion that first contacts an object, and a main body portion at least part of which is cylindrical and at one end of which the front end portion is mounted, The front end portion is detachably mounted on one end of the main body portion, and has an inner peripheral surface provided with an internal thread at the end portion mounted on one side of the main body portion. The main body has an outer peripheral surface at the end portion on the side where the front end portion is mounted, and the outer peripheral surface is provided with an external thread engaged with the internal thread, and an incomplete screw portion is provided in the inner end region of the external thread. A through threaded hole is provided at a portion of the front end portion that is opposite to a portion of the external thread, and when mounted at one end of the main body portion, a headless set screw is inserted and fixed in the through threaded hole.

2. A punching tool according to claim 1, characterized in that: The stop screw has adhesive attached to the screw head.

3. A punching tool according to claim 1, characterized in that: The stop screw is a screw made of synthetic resin.

4. A punching tool according to claim 1, characterized in that: The through threaded hole is disposed at a position opposite to the incomplete screw portion.

5. A punching tool according to claim 1, characterized in that: The incomplete screw portion is a portion that engages with a portion of the internal thread of the front end portion in an abnormal state, and the recessed portion of the external thread gradually becomes shallower as it moves away from the end of the main body portion.

6. A punching tool according to claim 1, characterized in that: The Rockwell hardness of the front end portion is harder than the Rockwell hardness of the main body portion.

7. A punching tool according to claim 1, characterized in that: A hook hole into which the protrusion of the hook wrench is inserted is provided on the outer peripheral surface of the front end portion.

8. A punching tool according to any one of claims 1 to 7, characterized in that: A plurality of different types of front end portions are provided, and the front end opening that first comes into contact with the object has different sizes and shapes, or both, or different materials.

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