JPH01503128A - thread cutting tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] thread cutting tool The present invention relates to tools for cutting and repairing threads, and particularly relates to tools for cutting and repairing threads. Repair damaged or twisted threads by cutting new threads. , to restore damaged thread threads or to clean dirty or corroded thread threads. It is about the tool and how to use this tool. More specifically, the book The invention is a hand tool with a variable diameter tap, and is designed to prevent damage to one side of the thread, especially the thread thread. This machine can cut female threads even when the tool can only be inserted from the opposite side. It's about the ingredients. More details《In other words, the present invention is basically a manual telescoping system. A tap shaped like a spark plug hole or similar hole in an internal combustion engine. If the internal thread is damaged or twisted, there is also a tool to repair it. It is.

The description of the invention is particularly applicable to repairing damaged spigots in spark plug holes. However, the present invention is not limited thereto. However, those with other structures or those used for other purposes are also included within the scope of the present invention. Please note that this tool can only be used with female threads, e.g. spark plug hoses. A telescopic tool for cutting internal threads, such as those formed on the inner surface of a threaded hole, such as a It can be a tap or a stand, such as an engine stand or an exhaust manifold. A variable-diameter screwdriver used to cut threads on the outside of a stand, etc. It may also be of a type.

When using lightweight alloys in engineering, especially in the automotive industry, e.g. When using parts made by casting aluminum rod or 1R lightweight alloy containing aluminum, this The problem is that these alloys are softer than traditional materials like cast iron. become. Therefore, such alloy parts may require the wrong tool to repair them. Sparks are easily damaged, especially if they are used in a harsh manner or handled roughly. It is a problem if the threads of the lug holes become scratched. What is the structure of modern engines? 11 One or more spark plugs may be damaged due to Is it installed in a place that is hard to reach, or is it surrounded by other parts? This is often the case. Parts are packed closely together in the engine compartment. Therefore, before turning the plug or screwing it into the hole, make sure that the spark plug and spark It is difficult to check whether the plug hole cores are aligned accurately. If the spark plug core is not aligned correctly, the male thread of the plug may not fit into the plug hole. If the thread cannot be engaged correctly with the female thread of the plug hole, the thread of the plug hole may have more spacing. The plug is made of a softer material than the threads of the plug, so the former may be damaged. , may be twisted or even damaged, and in such cases This prevents the plug from being inserted deeper into the plug hole. The airtightness of the grilling chamber cannot be maintained.

Also, the area around the spark plug is dirty, corroded, or has deposits attached. If you do so, the female thread of the spark plug hole will become clogged, and the spark plug Accurate alignment becomes impossible and the spark plug is forced into the plug hole. Doing so may damage the threads of the hole. In addition, particulate substances such as bullets may adhere to the If the threads of the spark plug meet the threads of the hole in the plug hole, There is a risk that threads that can be inserted may be attached. In such cases, plug It will be necessary to straighten or repair the holes. Repairs usually require an engine head must be removed, which is time consuming and therefore costly. It turns out. Particularly auto repair shops remove heads, repair threads, and This saves time because it is difficult to charge the repair client for the cost of restoring the item to its original condition. I have to make a promise. You can also use the spark plug hole to repair threads. Expand it with a drill, re-thread it with a tap with a larger circumference, and then add a larger circumferential tap there. Another option is to screw in an insert like Izu's Helicoil. In this way is the chips generated when drilling and threading to insert the helicoil. However, it falls into the combustion chamber through the spark plug hole, which has a negative impact on the life of the engine. Impact is inevitable.

The main object of the invention is therefore a new tap for cutting and repairing internal threads. , especially when a tool can only be inserted from one side of the tapped hole. The purpose is to provide a large threaded tap for repairing damaged threads. this The tap is, for example, the spark plug socket in the cylinder head or engine block. Mounting can be used to repair screws the size of screws. Spark plug hole.

In this case, only the outermost threads are damaged and the remaining threads are intact. is common. Repairing such damaged threads with conventional taps is extremely difficult. damage to threads is most likely to occur at the beginning of the thread size, so It is very difficult to insert the cap into the screw hole and make sure that they engage correctly. If the initial engagement is not done correctly, residual damage will occur as the tap is pushed in. This will damage even the threads that are not covered.

The invention consists of at least two movable body parts, each part having a threaded section. The threaded portion is moved into the first and second positions by the movement of the main body portion. when the threaded part is in one position and the other position. Thread cutting operations can be carried out because they are closer to each other than when We have created a positioning means that helps to accurately locate the cut part in the threading position. Provides a thread cutting tool with features.

The invention also comprises at least two movable body parts, each body part having its own movable body part. Has a threaded section at or extending toward one end. , the body portion is movable between a first position and a second position, and Precisely align the threaded portion with at least one of said threaded portions. A thread cutting tool equipped with a positioning means for determining the thread cutting position, the tool When the body part is in the first position, the thread cutting part is separated from the material to be threaded. and when the main body portion is in the second position, the thread cutting part is used for thread cutting operation. To provide a thread cutting tool characterized in that the tool is located at a certain position.

Additionally, the present invention provides positioning means to help accurately locate the tool within the screw hole. , a plurality of body parts have threaded portions facing outward, and provided with means for moving between the retracted position and the retracted position, when the body part is in the activated position. The thread cutting part can cut a single helical female thread of a predetermined diameter, and the recessed When in position, the threaded portions are located close to each other and have the predetermined diameter. can pass through the tapped hole, and the threaded portion engages the opening of the tapped hole. For thread cutting, characterized in that it is placed in a position within a screw hole by the positioning means. Provide tools.

A typical example of the main body part is a long and thin shape that connects to the tool with elasticity. and is elastically pressed in one position, and a force that opposes this pressing force is applied. A structure that moves to the other position when a force is applied, and elastically returns to the first position when the force is removed. Examples include:

In one embodiment, the threaded portion and the body portion are arranged so that the tool is in its normal rest position. At some point, they are located close to each other due to the pressing force caused by the elasticity of the main body. a Alternatively, in another embodiment, the threads and the body portion are located in the normal rest position of the tool. When placed, the pressure acting on these parts causes them to be placed further apart from each other. The sea urchin is turning. Therefore, in some embodiments, the rest position is when the tool is folded. This refers to the folded and retracted state, and in this state, the main body is inserted into the screw hole. By the means of moving the part, it is spread out against the natural pressing force of the tool, and the working position is take. In yet another embodiment, the natural state is the actuated position and the tool is drilled into the drill hole. It is only momentarily crushed when the tool is inserted into the tool, but the natural elasticity of the tool itself immediately It widens to take up the thread cutting working position.

One example of a means of operation, ie, a means of moving a body part, is to It serves to hold the tool in a stable or working position, preventing the tool from being compressed during use. Examples include those with a structure that prevents cavities. In other cases, this means of operation may be applied to the tool. It has a structure that transforms the tool from its natural state to an expanded state, that is, an operating position. Ru.

The operating means may also be in the form of an elongated spindle or prongs; One end of the spindle or prong may be tapered and the other end may have a larger diameter. It is recommended to provide a large diameter operating knob with a spindle or prong. A means for turning or inserting the plug, such as a handle or a horizontal It is possible to provide a means such as a hole, a jagged part to make it easier to grasp with fingers, or a prismatic shape. shape, and use a correspondingly shaped handle such as a spanner or four or hex wrench. The main body of the tool may be adapted to be able to be attached to the handle, and the operating means may be provided with a collar. It may also be screwed into.

In this case, the thread of the operating means should be left-handed, and the operating means of this tool An elastic means may be provided between the bodies. The elastic means is preferably a rubber O-ring. .

The operating means is a sleeve that covers the outside of the tool and is movable along the axis of the tool. may contact the elongated body portion when the sleeve is in one position and are pressed together and compressed.

In addition, when the sleeve is in the other position, the pressure applied to the main body when the sleeve is retracted is The main body part becomes wider. The operating means is also a pin provided in the center of the hollow part of the main body, Press it against the body and push it apart so that the pin is partially or completely retracted from the body. The main body may be compressed slightly when the pin is pressed down. It can be installed inside the hollow part of the main body and controlled so that the main body part is gradually expanded. When the bottle is in one position, it is spring-loaded. when the pin is released from the spring load, pulling the two body parts apart from each other. It may also be possible to push the spring apart by an amount corresponding to a predetermined spring tension. .

The main body part is attached to the tool with elasticity, and between the compressed position and the operating position It is a good idea to have enough flexibility to move the tool. , 4, 5, 6 or more body members are provided at regular intervals. A body member having a good Spacing between each lot is maintained. This elongated slot has elastic material. a cutout or small hole forming a hinge means located at the base of the body member; The main body part provided at the end of the tool on the side far from the threaded part is movable. The main body member has an elongated shape, and its longitudinal axis is the same as the tool length. The longitudinal axis of the slot should preferably be parallel to the longitudinal axis of the slot. It is also preferable to arrange them so that they are parallel to the longitudinal axis of the tool.

Next, a method of using one embodiment of the tamp of the present invention will be described. Tap in retracted position At some point, the positioning means inserts the threaded part into the threaded hole of the predetermined diameter, and a zero-order operating means, i.e., a main body, which can be inserted until it engages the wall around the mouth; Operate the means to move the part to expand the main part and align it with the thread of the threaded part. Adjust the diameter of the threaded part accurately so that the valley engages with the thread-sized valley and peak.

Next, carefully insert the threaded part into the undamaged thread and turn it. By rotating the thread, the threaded part may engage with the thread of the tapped hole, causing damage to the part. Can perform minute thread repairs. When you pull out the tap from the screw hole in this way, , the threads have been repaired cleanly, and the positioning means of the spark bra are threaded It may also be a shoulder adjacent to the inner end of the section.

The thread cutting section has a tapered chamfer and a center part for completely cutting the thread. The cutting edge of a thread cutter should consist of a central part and a tapered trailing part. It is best to allow the thread to be cut when the threaded section is pulled out of the hole. stomach.

The rake angle of the threaded portion may be negative, zero, or positive.

The invention will now be described in conjunction with the accompanying drawings.

In the diagram: FIG. 1 is a partial cross-section showing one form of the present invention consisting of an outer main body portion and an inner spindle. Side view.

FIG. 2 is a side view of the outer main body of the embodiment of FIG.

Figure 3 is a side view of the inner spindle in Figure 1, and Figure 4 shows the cylinder in the compressed state. 2 shows the tap of FIG. 1 inserted into the spark plug hole of the driver head.

Figure 5 shows the state in which it is expanded to the thread cutting position and pressed against the cylinder head. shows the tap.

FIG. 6 is a diagram similar to FIG. 6 showing another form of the tap of the present invention.

FIG. 7 is a diagram similar to FIG. 5 showing another form of the tap in FIG. 6.

FIG. 8 is a side view of the outer main body portion of a tap according to another embodiment of the present invention.

FIG. 9 is a side view of the spindle inside the tap according to another embodiment of the present invention.

FIG. 10 is a partially sectional side view showing the case where the parts shown in FIG. 8.90 are used in combination.

The tap 2 shown in Figure 1-7 has a hollow cylindrical body 4 over its entire length and a body 4 when in use. It consists of a spindle 6 which is housed within. Spindle 6 can rotate inside main body 4 It is attached so that the axial position of the main body 4 can be adjusted, and the retractable The position can be adjusted between the tapping position and the position corresponding to the tap operating position. There is.

One end of the main body 4 is formed with four axially extending slots 8, each having a circular opening. It continues to the mouth part 1o. Between this slot 8 are four elastic fingers. A portion 12 is formed. The finger 12 is elastically inserted into the circular opening of the main body. It is attached around 10. A threaded portion 14 is provided at the end of the finger 12. is provided.

When the tap is moved between the retracted and activated positions, the four The elastic fingers 4 are movable relative to each other. Method of manufacturing main body 4 and Then, the threaded portion 14 is formed by a single screw thread, and then the slot 8 is formed, Finally, it is preferred to form holes 10 in the body, in this embodiment the fingers are As shown in Figure 0, the natural state when it is recessed is when it is not under any load. When the finger is retracted, the slot 8 at the free end of the finger is closed. Therefore, adjacent threaded portions 14 are in contact with each other. In this position, the finger The end can be inserted into the spark plug hole as shown in Figure 4, but the screw The type or shape of the threaded part 14 is not suitable for cutting work, regardless of the type or shape. For example, the rake angle can be positive, negative, or zero; It may have a uniform diameter over its length, or it may have a lead-in and/or lead-out. A chamfered end consisting of a threaded portion may also be provided.

Unlike the conventional plug 2, the plug 2 of the present invention cannot be inserted into the screw hole 28. If you pull it out from there, it may form a new thread at the threaded part or cause damage. It is used to repair damaged screw threads.

One end of the spindle 6 engages with a tapered cam surface 26 provided inside the threaded portion. , a tapered part 16 for expanding or reducing the diameter of the threaded part, and a strip at the other end. A boss 18 is provided for turning the spindle.

In addition, there is a male thread 20 near the boss of the spindle, so when in use, Threadedly engages with a female thread 22 provided at the end opposite to the threaded portion 14 on the inner surface of the body 4. Ru.

A retaining napft 24 or a member of M4El may be provided on the screw thread 20 (Fig. 6). ．． In the embodiment shown in FIG. This is because it functions as a stopper that limits the movement of the dollar only within the hollow body 4.

When using the device of the invention, the spindle 6 is inserted into the central longitudinal bore of the hollow body 4. Insert the spindle until it is almost completely seated in the 0 When in the reduced diameter position of Fig. 4, the taper part 1 of the spindle is screwed into thread engagement with the thread 22. 6 is not in contact with the tapered cam surface 26. In this state, the main body 4 is as shown in FIG. The adjacent threaded portions 14 are in contact with each other (or When the spindle inside the hollow body 4 is further turned, the The perforator portion 16 moves axially and engages the cam surface 26, causing the finger 12 to move in the normal non-operating position. Push outward from the moving position. The spindle is fully inserted into the main body 4. , when the threaded portion 14 is rotated deeper and inserted, the threaded portion 14 cooperates as shown in FIGS. 1 and 5. each other to a position where they can work together to form a single spiral thread. It has a length that allows it to be pushed apart. Tap at this position As it rotates, the tool gradually pulls out of the hole, and at this time a new tensioning process is performed. It can straighten and repair damaged or twisted threads.

Figure 4 shows the cylinder with the tool in the retracted position, i.e., under normal load. In this figure, the cylinder head is inserted into the screw hole of the head 30. The upper part of the screw hole when viewed from the outside, that is, the 1st, 2nd, and 3rd threads from the outside are damaged. 34, which forms the head of the combustion chamber. The inward threads of the section shall be intact. The thread 34 is a threaded portion 14 is compressed enough to pass through the screw hole 28, the head 30 is It can be seen that it is located near the inner wall. From this state, attach the spindle 6 to the main body 4. When screwed in, the finger 12 expands and the threaded portion 14 also expands into the threaded hole 28. It widens until its diameter is large enough to form a ridge of the same diameter. In this way When the tool assumes the threading position, the fingers move from their normal unloaded position. Expand. At this time, the threaded portion 14 will be properly engaged with the undamaged screw. must operate the tool carefully.

When the tool 2 is turned, the threaded part 14 passes through the screw hole 28, and at this time, the damaged part is removed. The mountain 32 is repaired and corrected. The threaded portion 14 is an undamaged thread 34. The tap engages in precise alignment with the damaged thread. 32 can be corrected so that it is accurately aligned with the thread 34. That is, the present invention In this case, the undamaged threads 32 are used to guide the tool to remove the damage. This is to ensure that the damaged threads 32 are accurately repaired. At this stage, The spindle 6 must be rotating together with the body 4, and for this one implementation In the example, a locking napft 24 is provided to securely fix the spindle to the main body 4. so that it rotates with the main body. During the thread cutting process, the flat of body 4 A spanner engaged with the top surface 36 or a pin or shaft inserted into the inner hole 40 of the boss 18. Rotational torque from the foot 38 or other means acts directly on the main body 4. Grease or Screw a sticky glue-like lubricant like a paste-like substance boiled into it Clean the surface of newly formed or repaired threads. At the same time, the chips generated during the repair work are pasted to prevent the chips from falling into the combustion chamber. It may be lowered to prevent damage to the engine.

Like reference numerals in the embodiment shown in Figure 6.7 refer to similar features as in the embodiment of Figures 1-5. shall be shown. In this embodiment, the outer surface of the tamp 2 near the threaded portion 14 has a shoulder. A section 50 is provided. The shoulders 50 are arranged circumferentially and each finger It consists of four parts corresponding to 12. When the tool is in the retracted position, shoulder 5 The outer diameter of 0 is larger than the diameter of screw hole 28 to prevent the tool from being inserted too deeply into the screw hole. It can be prevented. Also, in this embodiment, a locking nut is attached to the thread of the spindle 16. Instead of providing the thread 24, a relatively large pinch left-hand thread 52 is provided, and the thread 20 By engaging with the screw thread 54 provided instead, the post 18 becomes a hollow body. Insert the spindle 16 deep enough into the body 4 until it hits the top of the finger 14 can be expanded. To use this tool, The body 4 is inserted into the screw hole 28 while the ringer 12 is not under the retracted load. In addition, avoid touching either the damaged or undamaged threads 32. However, the shoulder portion 50 contacts the head 30 and the tap 2 is inserted deeper into the screw hole 28. Next, screw the spindle 6 into the main body 4 until it can no longer be inserted. The entire cut portion 14 is expanded so that the thread 34 and the valleys and peaks of the thread of the thread cut portion 14 are correct. While rotating the main body 4 and spindle 6 together, rotate the tap 2 until the main body 4 and spindle 6 are properly engaged. When pulled out from the screw hole 28 using the screw thread 34 as a guide, the damaged screw thread will be correctly removed. will be repaired.

A guide sleeve 4 having an inner diameter approximately the same as the outer diameter of the cylindrical portion 44 of the main body 4 is attached to this tamp 2. When using the tap 2, the lower end 46 of the sleeve 42 may be attached to the head. 30, grip the sleeve firmly and rotate the tap 2 therein.

The sleeve 42 ensures that the tap is pushed outward in the axial direction of the screw hole 28. This results in more accurate thread cuts and threads 28. It became possible to align oneself with Ru.

Thread 20.22 in one embodiment of the invention and thread 52 in another embodiment ．． Both 54 are preferably left-handed threads, and represent the rotational torque that the tool receives during the thread cutting process. is preferably transmitted via a pin 38 connected to the spindle. .

By making the thread a left-hand thread, the spindle 6 can be pulled out from the main body 4 during rotation. There is no fear and the main body 4 and spindle 6 can surely rotate together.

Further, the main body 4 may be provided with a protruding piece or a protruding portion extending in the length direction of the tool. The length of the handle 6 can be changed as appropriate. In addition, the spindle itself can be expanded and contracted. If a short tap cannot reach the screw hole, a long tool can be used. It is necessary to use.

In yet another embodiment, the body 4 is provided with upper and lower threaded sections, which prevent damage. Chips cut from the girder thread 32 by the upper thread cutter are removed from the upper thread. It is stopped by the lower threaded part that continues at intervals from the cut part, and the chips enter the combustion chamber. is prevented from falling. or viscous materials such as molybdenum disulfide or vaseline jelly. An adhesive substance may be used to adhere the chips so that they do not fall off.

Another embodiment of the tool, shown in Figures 8-10, includes an improved threaded section 14 and a hexagonal collar. -60 and an improved spindle 6 is provided. This spindle has a rubber A groove 62 for fitting an O-ring is provided. Fingers 12 are pushed apart. The rest position is when the finger is in the pressed position, and the finger receiving the pressing force at this time is shaped The size of the opening formed is approximately the same as the opening of the spark plug hole. That is, it is approximately equal to the opening of the spark plug hole, or slightly larger. Alternatively, the main body 4 is configured to be small. Opening size when in rest position The size may be the same as or slightly different from the size of the opening required during operation.

In any case, the size of the opening when in the rest position is such that the screw hole 28 has a threaded portion 1. The threaded portion 14 is larger than the opening in the retracted position before inserting the threaded portion 14. has a distal end 68 forming a chamfered trailing thread, and an object to be threaded or A central portion 70 having a maximum diameter corresponding to the thread to be repaired, and a biting portion. It consists of a root portion 72 with a chamfered surface. The threaded portion 14 is shouldered by the shaft portion 74. part 50, and the threaded part 14, especially the central part 70, is damaged. It engages securely with the unrecognized thread 34, and the threaded section is cut by this thread. It is designed to guide you accurately. In another embodiment, the size of the central portion 70 is The hole is made one size larger than the screw hole to be cut. A thread is formed in the screw hole and an insert such as a helicoil is inserted into this hole. It has become.

To explain the power of using this tool, first, when the spindle 6 is not inserted inside. Grasp the main body 4 and compress the finger 12 against the elasticity of the finger itself. Ru. With the fingers compressed, insert the threaded part 14 into the threaded hole 28, and then When released, the threaded portion 14 expands and engages the undamaged thread 34. If the center alignment is not accurate, shake the main body 4 to correct the center of the tap. Make sure that the threads are aligned properly and that the threaded portion 14 engages with an undamaged thread. Bye.

Next, insert the spindle 6 to the deepest part of the hollow body 4 against the resistance of the ○ ring 64. Enter. At this time, the tapered portion 6 of the spindle 16 comes into contact with the cam surface 26 of the finger 12. Touch the finger and hold it in the activated position, or slowly move the finger until it is in the activated position. Next, remove the main body 4 from the screw hole 28 while rotating it together with the spindle 6. If a large rotational force is required, use a suitable means such as a spanner or handle to tighten the lock. You may apply torque to the roller 60, and pull out the tap 2 while twisting it. , the threaded part advances while being guided by the undamaged thread 34, If it hits the damaged thread 32, a new thread will be formed there or a damaged thread will form. It works to repair. i.e. the undamaged thread 34 and the center of the tamp 2. are precisely aligned, creating a single continuous spiral thread. This allows damage to the screw to be repaired. The advantage of this tool is that even if the tool is Even if you get stuck in the mountains, you can easily compress the main body. This means that it can be pulled out of the hole.

The tap of the invention can also be used to clean dirty threads. . In this case, the dirt is pushed out of the screw hole by the threaded part, so There is little risk of falling down.

The foregoing descriptions are merely illustrative of the present invention, and the disclosure herein is intended to be illustrative only. The invention includes any and all novel features and/or combinations of novel features. Various changes may be made to the above embodiments without departing from the scope of the invention. Please note that there may be variations of the present invention other than those disclosed here. Those skilled in the art will understand that the present invention does not fall within its spirit and scope. Like Balinese Siran, which includes modifications.

international search report

Claims (18)

[Claims] 1. at least two movable body portions each having a threaded portion; the portion is movable between a first position and a second position; When in the first position, the threaded part is moved away from the member to be threaded. an operating means for placing the body in a position, and when the operating means is moved, the main body portion is moved forward. said second position, i.e. an operating position for performing thread cutting operations on said material. A thread cutting tool characterized in that the tool is held at the same position or at that position. 2. at least two movable body parts, at one end of each of said body parts; a threaded portion located at or extending toward one end of each of said; The body part is movable between an active thread cutting position and an open position in which the tool is removed from the thread. operating means for use when the tool is in the operative position; at least one of the threaded portions, the threading means being adapted to the threading position; A thread cutter characterized by being equipped with a positioning means for accurately positioning the thread tools. 3. A positioning means for positioning the tool at a precise position in the hole and a plurality of screws. A threaded portion provided on the outer surface of the body portion and a threaded portion provided on the outer surface of the body portion and the threaded portion provided on the outer surface of the body portion and the A position where the threaded part can form a single helical internal thread with a predetermined diameter. and when in the retracted position the threaded portions are relatively close together. in order to move said body part so that it can be placed in position and pass freely through the threads. the threaded portion being engaged with the opening of the threaded hole; A thread cutter characterized by being positioned within the thread by a determining means. Tools for cleaning. 4. When the threaded portion is in the operating position, it is a generally cylindrical screw in the form of a tap or die. According to any one of the above claims, characterized in that the shape is for cutting into pieces. Thread cutting tool as described. 5. The operating position of the threaded part is equal to the open position and is opposite to the pressing force of the main body part. Any of the above, characterized in that it is able to expand elastically depending on the situation. A thread cutting tool according to claim 1. 6. When the threaded portion is in the open position, the spacing is approximately equal to that required for the operating position. spaced apart from each other by a distance and directed inwardly against the natural pressing force of said body portions. Any one of the above claims characterized in that the material is elastically deformable. The thread cutting tool described in . 7. Where said positioning means is provided, it is arranged such that it engages the object to be threaded. The thread cutting tool according to any one of the preceding claims, characterized in that the shoulder portion is Ingredients. 8. The tool is moved to the operating position by the movement of the operating means. A thread cutting tool according to any one of the preceding claims. 9. The operating means is a spindle that can be inserted into the hollow body portion. A thread cutting tool according to any one of the preceding claims. 10. One end of the spindle is tapered, and the other end is used to rotate the spindle. 10. The thread cutting tool according to claim 9, further comprising means for rotating the thread. 11. The spindle is provided with a screw or an elastic resistance means, preferably an O-ring. The thread cutting tool according to claim 9 or 10, wherein the thread cutting tool is provided with a thread cutting tool. 12. The operating means is a sleeve provided on the outer periphery of the substantially cylindrical body of the tool, and the front A sleeve is movable axially along the length of the body to place said body portion in an actuated position. It is characterized by being able to move between the position where it is placed and the position where it is in contact with the outer surface of the main body part. A thread cutting tool according to any one of the preceding claims. 13. The positioning means is provided on the outer periphery of the tool somewhat toward the center of the threaded portion. A thread cutting tool according to any preceding claim, characterized in that it is a shoulder means. 14. The main body portion has corresponding strips provided at substantially constant intervals in the circumferential direction of the tool. elongated fingers separated by long slots, said fingers is resiliently connected to the body. Thread cutting tool. 15. forming hinge means for moving the body portion in the elongated slot; a hole is provided therein, and the side further from the threaded portion located at the base of the body portion; A tool according to claim 14, characterized in that the hole is provided near the end of the tool. Tool for cutting. 16. A chamfered chamfered part where the threaded part is inward of the remaining threaded part. , a main thread located in the center, and a chamfer located at the end of the other thread. Thread cutting according to any of the preceding claims, characterized in that it consists of a trailing part with a tools. 17. The threaded portion includes an upper threaded portion and a lower threaded portion, and the upper threaded portion and the lower thread cutting section are separated, and the upper thread cutting section exclusively performs the thread cutting work. , the lower threaded section is followed by the upper threaded section by the upper threaded section. The device according to any one of the above claims, characterized in that the device is adapted to catch generated chips. Thread cutting tool included. 18. A thread cutting tool as described in the text with reference to the accompanying drawings.