WO2006126299A1

WO2006126299A1 - Tool for correcting thread

Info

Publication number: WO2006126299A1
Application number: PCT/JP2005/023167
Authority: WO
Inventors: Hideki Yamanaka
Original assignee: Light Seiki Co., Ltd.
Priority date: 2005-05-25
Filing date: 2005-12-16
Publication date: 2006-11-30
Also published as: CN101227996B; CN101227996A; JP2006326731A; JP4523486B2

Abstract

A tool for correcting threads capable of correcting the threads of a bolt from the intermediate portion of the bolt in a restricted area. The tool (1) for correcting the threads comprises a die (2) having divided two die pieces (2') and (2') and an openable polygonal holder (3) having, at its center portion, a die insertion hole (3a) for detachably holding the die (2). The holder (3) comprises a pair of holder pieces (3') and (3') rotatably connected to each other at their base ends and having semi-circular or square cutout parts (3a') forming the die insertion hole (3a) formed at their center portions facing each other, fixing screws (4) fixing the die pieces (2') and (2') to the cutout parts (3a') of the holder pieces (3') and (3'), an elastic body (5) interposed between the holder pieces (3') and (3') and energizing them in an opening direction, and a locking mechanism (6) installed between the holder pieces (3') and (3') and annularly forming the die pieces (2') and (2') fixedly held by the holder pieces (3') and (3') by keeping a distance therebetween at a prescribed distance.

Description

Specification

Thread correction tool

Technical field

[0001] In the present invention, for example, when a screw thread of a bolt such as an anchor bolt used at a construction site or an implanted bolt used in an automobile is crushed or rusted, the screw thread of the bolt is properly registered. In particular, it is possible to correct the screw thread of the bolt even in a narrow space reliably and satisfactorily, and even if it is a long bolt, the partial force of the bolt It relates to a thread correction tool that can be corrected.

Background art

[0002] Generally, at work sites such as construction sites and automobile repair shops, the bolts of bolts such as anchor bolts and anchor bolts that are driven into concrete and used in automobiles are crushed. If the bolt cannot be used due to or rusting, or if the bolt cannot be used due to foreign matter such as paint or concrete adhering to the screw thread, use a conventionally known die and die holder (not shown). The screw thread of the bolt is corrected.

[0003] That is, when correcting a screw thread of a bolt using a die and a die holder, the die is fixed to the die holder, and the cutting edge of the die is pressed against the tip of the bolt to be corrected. Hold the two rod-shaped handles provided on the die holder, rotate the whole die holder, and move the die and the die holder sequentially along the bolt. Then, when the die passes through the modified part of the bolt, the function of the die will correct the screw thread that has been crushed and the screw thread that has been crushed.

[0004] To correct the screw thread of the bolt using the die and the die holder, screw the die into the bolt tip force and move the die and the die holder along the bolt to the screw thread correction part. Therefore, when the screw thread that needs to be corrected when the bolt is corrected is in the position where the tip of the bolt is far away, the die and the die holder are moved tens of times or hundreds of times. Have to be rotated and the thread can be easily and easily corrected in a short time. There was a problem that it was not possible. However, if there is a screw thread that needs to be corrected at the tip of the bolt, the phase of the screw thread at the bolt tip newly formed by the die and the screw thread at the bottom of the bolt that was normally formed is matched. There was also a problem that the screw thread of the bolt could not be corrected accurately.

In addition, the die holder has two rod-shaped handles arranged in a straight line in the diameter direction of the die centering on the die, so a wide turning radius is required when correcting the bolt thread. As a result, there was a problem that the bolt thread could not be corrected in a narrow place where there was an obstacle within the turning radius of the handle.

[0005] On the other hand, in this type of field, a device has been developed so far that the screw thread of the bolt can be corrected from the middle part of the bolt, and is published as Japanese Utility Model Publication No. 1-92324. Patent Document 1).

That is, the instrument 20 (hereinafter referred to as a thread corrector 20) has a pair of half members 22, 22 in which a part as shown in FIG. And half dies 22a and 22a, each of which is provided on one side of both half members 22 and 22, and the dies are divided into two halves. It is composed of a flange 22b, 22b and a fixing mechanism 23 which is provided between both grip halves 22b, 22b and can fix both die halves 22a, 22a closed.

[0006] Thus, when correcting the thread of a bolt (not shown) using the thread corrector 20, first, the fixing mechanism 23 is operated to fix the two die halves 22a, 22a. The state is released, and both grip halves 22b, 22b are spread outward to open both die halves 22a, 22a. Next, insert a part of the bolt to be corrected between the two die halves 22a, 22a (the part where the thread is not deformed) and close both grip halves 22b, 22b Part 22a, 22a [This formed die tooth 22c, 22c [Thus, pinching the Bonole ridge], and in this state, the fixing mechanism part 23 is operated to close both die halves 22a, 22a. Fix it. After that, grasp both grip halves 22b and 22b by hand and rotate the entire thread corrector 20 around the bolt. Then, the screw thread crushed by the die teeth 22c and 22c of both die halves 22a and 22a is corrected to a regular shape.

This thread corrector 20 can open and close both die halves 22a, 22a with die function. As a result of this structure, it is possible to achieve an excellent effect that the screw thread of the bolt can be corrected even with a partial force of the bolt.

The screw thread corrector 20 has a relatively long bar-shaped grip half 22b, 22b similar to a die holder provided with two bar-shaped handles. A wide turning radius was required during work. As a result, there was a problem that the screw thread of the bolt could not be corrected in a narrow place where there was an obstacle within the turning radius of the grip halves 22b, 22b.

In addition, since the screw half corrector 20 has the die half parts 22a and 22a having a die function integrally provided on one side of the half part parts 22 and 22, the bolt diameter, the screw pitch, etc. The same thread corrector 20 could not be used when fixing different bolts. As a result, this thread corrector 20 needs to have several types of thread correctors 20 with different sizes of the die halves 22a and 22a depending on the diameter of the bolt to be corrected and the pitch of the screw. As a result, there was a problem that the cost would increase and it would be difficult to store and carry. However, if the die teeth 22c, 22c of the die halves 22a, 22a are damaged, the thread corrector 20 itself must be discarded, which is inferior in economic efficiency. It was.

Further, the thread corrector 20 includes a fixing shaft 23a that is fixedly released to one grip half 22b by a fixing mechanism 23 that fixes and releases both die halves 22a and 22a, and a fixing shaft. The fixed nut 23b that is screwed into the bolt provided at the tip of 23a and the split groove 23c formed in the other grip half 22b are also configured to fix and release both die halves 22a and 22a. When fixing, loosen the fixing nut 23b and remove the fixing shaft 23a from the split groove 23c formed in the grip half 22b, or insert the fixing shaft 23a into the split groove 23c of the grip half 22b and fix the nut. It was necessary to tighten with 23b. As a result, this thread corrector 20 has a problem that it takes time to fix and release both die halves 22a, 22a, and the bolt thread cannot be corrected quickly. In particular, when the number of bolts to be corrected is large, the above problem becomes more prominent.

Patent Document 1: Japanese Utility Model Publication No. 1 92324

Disclosure of the invention Problems to be solved by the invention

[0008] The present invention has been made in view of such problems, and its purpose is to reliably and satisfactorily correct the screw thread of the bolt even in a narrow place, and to determine whether the bolt is in the middle. Therefore, it is intended to provide a thread correction tool that can correct the thread, and is excellent in handling and operability, and can reduce costs.

Means for solving the problem

[0009] In order to achieve the above object, the invention of claim 1 of the present invention has a die for forming a screw thread and a die mounting hole for detachably holding the die at a central portion, A thread correction tool comprising a polygonal holder that opens and closes so that a hole is divided into two in the diametrical direction, and the die is formed by dividing a round die or a square die into two in the diametrical direction. The holders are arranged in parallel on the same plane, and their base ends are rotatably connected to each other, and each die piece is held at an opposite location in the central portion. A pair of plate-shaped holder pieces provided with semicircular or square cutouts for forming die attachment holes, and fixing for fixing each die piece held in the cutouts of both holder pieces to the cutouts. Between the screw and both holders, An elastic body that urges the rudder piece in the opening direction, and a lock that is provided between the two holder pieces and holds the gap between the two holder pieces at a predetermined distance to make the die pieces held and fixed to each holder piece circular. It is characterized by being configured to be openable and closable between a closed position where both die pieces are annular and an open position where both die pieces are separated.

[0010] According to the invention of claim 2 of the present invention, recesses in which the die pieces are detachably fitted in conformity with the shape of the outer peripheral edge portion of the die pieces are formed on the inner surfaces of the cutout portions of both holder pieces. There is a special feature.

[0011] The invention of claim 3 of the present invention is characterized in that both holder pieces are formed in a rectangular shape, and the outer peripheral edge in the longitudinal direction of both holder pieces is formed in a corrugated shape.

The invention's effect

[0012] A thread correction tool according to claim 1 of the present invention includes a half-shaped die formed of two die pieces formed by dividing a round die or a square die into two in the diametrical direction, and a half portion at a central portion. Openable and closable polygonal shape with a die mounting hole for holding and fixing the dies in a removable manner Because it is made up of a holder, the threaded handle where the rod-shaped handle of the conventional die holder has a long protruding part around the die, like the half-shaped grip half of the thread corrector, is rotated. The maximum working radius can be reduced. As a result, the screw thread correcting tool according to claim 1 of the present invention can perform the screw thread correcting work reliably and satisfactorily even in a narrow place.

In addition, since the screw thread correcting tool according to claim 1 of the present invention is configured to hold and fix the half-divided die so as to be detachable with a polygonal holder that can be opened and closed, the half-split is held and fixed to the holder. Can be exchanged for another halved die with different inner diameter and screw pitch. Therefore, the thread correction tool according to claim 1 of the present invention is a conventional screw thread that only needs to be replaced if the diameter of the bolt to be corrected, the pitch of the screw, or the like is changed. Prepare multiple thread correctors, such as correctors. You only need to prepare dies that have different screw pitches. As a result, the thread correction tool according to claim 1 of the present invention can be reduced in cost as compared with the conventional thread corrector, and can be easily stored and carried, and has excellent handling characteristics. . Still

The thread correction tool according to claim 1 of the present invention can be used again if only the die is replaced with a new one when the cutting edge of the die is damaged. It is also excellent in economic efficiency because it is not necessary to discard the tool itself.

The screw thread correction tool according to claims 2 and 3 of the present invention can provide the following effects in addition to the above effects.

That is, the thread correction tool according to claim 2 of the present invention has a configuration in which recesses into which the die pieces are detachably fitted are formed on the inner surfaces of the notch portions of both holder pieces forming the holder, respectively. When the die piece is held and fixed to the notch portion of the holder piece, the die piece is difficult to drop off, and the die piece can be held and fixed to the holder piece smoothly and smoothly.

Further, the screw thread correcting tool according to claim 3 of the present invention is configured so that both holder pieces are formed in a substantially rectangular shape and the outer peripheral edge portion in the longitudinal direction of both holder pieces is formed in a corrugated shape. This makes it easier for the operator to grip the holder when correcting the screw thread, enabling the thread correction tool itself to rotate smoothly and smoothly with respect to the bolt, and is also excellent in operability. It will be.

Brief Description of Drawings

FIG. 1 is a perspective view of a thread correction tool according to an embodiment of the present invention.

FIG. 2 is a plan view of the thread correction tool holder and the die closed.

FIG. 3 is a plan view showing a state in which the holder and the die of the thread correction tool are opened.

FIG. 4 is a front view of a thread correction tool.

FIG. 5 is a side view of a thread correction tool.

FIG. 6 is a side view of a state in which a die piece and a locking plate of a locking mechanism are mounted on one holder piece.

FIG. 7 is a side view of a state in which a die piece and an operation plate for a locking mechanism are mounted on the other holder piece.

FIG. 8 is a cross-sectional view taken along line AA in FIG.

FIG. 9 is a cross-sectional view taken along line BB in FIG.

FIG. 10 is a cross-sectional view showing a state where the locking plate of the locking mechanism and the operation plate are unlocked.

[Fig. 11] An explanatory diagram when the thread correction tool is used in a narrow space.

FIG. 12 is a front view of a conventional thread corrector.

Explanation of symbols

[0015] 1 is a thread correction tool, 2 is a die, 2 'is a die piece, 3 is a holder, 3' is a holder piece, 3a is a die insertion hole, 3b is a notch, 3f is a recess, and 4 is fixed Screw, 5 is an elastic body, 6 is a locking mechanism.

BEST MODE FOR CARRYING OUT THE INVENTION

FIGS. 1 to 11 show a thread correction tool 1 according to an embodiment of the present invention. The thread correction tool 1 is used in a construction site! When the thread of a bolt such as an implanted bolt that has been used is crushed or cracked, the thread is corrected to a regular shape, ensuring that the screw thread of the bolt is corrected even in tight spaces. In addition, the screw thread can be corrected even in the middle of the bolt even if it is a long bolt, and the thread can be corrected quickly and easily.

That is, the screw thread correcting tool 1 is a semi-finished screw thread forming tool as shown in FIGS. Has a split die 2 and a die mounting hole 3a for detachably holding the die 2 in the center, and the planar shape that opens and closes to divide the die mounting hole 3a into two in the diameter direction is approximately rectangular. It is made up of a holder 3 with a shape. By opening and closing the holder 3, the half-shaped die 2 can be opened and closed!

In this embodiment, the length of the holder 3 is set to 65 mm, the width of the holder 3 is set to 50 mm, and the thickness of the holder 3 is set to 14 mm!

[0018] The die 2 includes two semicircular die pieces, 2 'formed by dividing a round die having a cutting edge 2a in the inner peripheral edge thereof as shown in Figs. A female screw hole 2b is formed in the radial direction of the die 2 on the outer peripheral surface of both die pieces 2 ^, 2 '.

There are several halved dies 2 with the same outer diameter but different inner diameters, screw pitches, screw types, etc. Depending on the outer diameter, the pitch of the screw, the type of the screw, etc., it can be replaced as appropriate.

On the other hand, the holder 3 is arranged in parallel on the same plane, the base end portions thereof are connected to each other so as to rotate, and the die pieces 2 ′ and 2 ′ are arranged at opposite positions in the central portion. A pair of plate-like holder pieces 3 'formed with semicircular cutout portions 3 that form die attachment holes 3a, and the holder pieces 1 and 3' held in the cutout portions 3 ' A fixing screw 4 for fixing the die pieces 2 ′ and 2 ′ to the notch 3, and an elastic body 5 interposed between the holder pieces 1 and 3 ′ and biasing the holder pieces 1 and 3 ′ in the opening direction; The die pieces 2 'and 2' which are provided between the holder pieces 1 and 3 'and are held and fixed to the holder pieces 3' and 3 'while holding the gap between the holder pieces 1 and 3' at a predetermined interval are annular. And a locking mechanism 6 that opens and closes between a closed position (see Fig. 2) in which both die pieces 2 'are annular and an open position (see Fig. 3) in which both die pieces 2' are separated from each other. Configured.

[0020] Specifically, the pair of holder pieces 3 'are provided on both sides of the substantially rectangular thick metal block plate 3A and the metal block plate 3A as shown in Figs. It consists of two substantially rectangular metal cover plates 3B fixed by a plurality of fixing pins 7, and the outer peripheral edge in the longitudinal direction of each holder piece 3 'is the holder piece 3' It is formed into a corrugated shape to fit your hand when you hold it. On the base end side of each of the holder pieces 3 ', a pair of semicircular disk-shaped connecting portions 3c each having a penetrating shaft hole 3b are provided in a posture protruding outward, A rectangular storage space 3d for storing the locking mechanism 6 is formed at each of the opposing portions of the holder pieces 3 ′ and 3 ′ on the front end side. The connecting portions 3c of both the holder pieces 3 'are configured to be slidable so as to overlap each other, and are provided with a recessed portion 3e for accommodating the elastic body 5.

In addition, at the opposite positions (inner side of the holder piece, 3 ') of each holder piece, 3', each die piece, 'is detachably held to form a die attachment hole 3a. Circular cutouts 3a 'are provided respectively, and the die pieces 2' are detachably fitted to the inner surface of the cutout parts 3 to match the shape of the outer peripheral edge of the die pieces 2 '. A recessed portion 3f is formed.

Further, bolt holes 3g through which fixing screws 4 for fixing the die pieces 2 'to the recesses 3f of the notch 3 are passed are formed in the center of each holder piece 3'. This bolt hole 3g is formed in the center portion of both holder pieces 3 'so as to match the die piece fitted in the recess 3f of the notch 3 and the female screw hole 2b of 2'. This is a stepped bolt hole 3g consisting of a small diameter hole through which the screw part 4 is inserted and a large diameter hole in which the head of the fixing screw 4 is accommodated.

[0021] Then, the pair of holder pieces 3 'and 3' includes a shaft hole 3b that connects the connecting portion 3c of one holder piece 3 'and 3' with the connecting portion 3c of the other holder piece 3 'and 3'. The connecting shafts 8 are overlapped so as to coincide with each other, and the connecting shaft 8 is inserted into the shaft hole 3b of each connecting portion 3c, whereby the connecting shaft 8 inserted into the connecting portion 3c is pivotally connected. At this time, a die attachment hole 3a for detachably holding the die 2 is formed by a semi-circular cutout portion 3a 'at a location where the center portions of both holder pieces 3' are opposed to each other. The die attaching hole 3a is divided into two in the diametrical direction by turning both holder pieces 3 'in the opening direction.

[0022] The fixing screw 4 is formed of a hexagon socket head cap screw, and the screw portion is inserted into a bolt hole 3g formed in the central portion of the holder piece 3 ', and the tip end portion of the screw portion is attached to the holder piece 3' 3 The die piece 2 'can be held and fixed to the recess 3f of the notch 3 by screwing into the female screw hole 2b of the die piece 2' fitted to the recess 3f of the notch 3. [0023] The elastic body 5 also has a coil spring force in which both end portions are formed in a substantially linear shape as shown in FIGS. 2 and 3, and the coil portion is mounted on the connecting shaft 8 and has one linear end. The part is inertially locked to the inner surface of the recessed part 3e formed in the one holder piece, and the other end of the linear shape is locked to the inner surface of the recessed part 3e formed in the other holder piece. For this reason, the pair of holder pieces 3 'are always urged in the opening direction by the elastic force of the elastic body 5, and when the locking mechanism 6 described later is not functioning, both holder pieces 3', 3 ' The tip side is separated (see Fig. 3).

[0024] The locking mechanism 6 is provided in a storage space 3d formed on the front end side of both holder pieces 3 'and 3', and the die pieces 2 and 2 'held and fixed to both holder pieces 3'. The distance between the two holder pieces 3 'is kept at a predetermined distance so that is circular. That is, the locking mechanism 6 has a swingable locking plate 9 housed in a storage space 3d of one holder piece as shown in FIGS. 1 to 3, and a locking plate 9 attached in a predetermined direction. It comprises a coil spring 10 to be urged, a slidable operation plate 11 stored in the storage space 3d of the other holder piece, and a coil spring 12 for urging the operation plate 11 in a predetermined direction. And the operation plate 11 are detachably locked!

[0025] Specifically, most of the locking plate 9 is stored in the storage space 3d of one holder piece, on the same plane as the holder piece 3 'and in the longitudinal direction of the holder piece 3'. It is supported by a support pin 13 provided in the storage space 3d so that it can swing.

The locking plate 9 includes an arc-shaped locking piece 9a protruding outward from the storage space 3d, and a plurality of teeth 9b are formed at a constant pitch on the inner surface of the locking piece 9a. Has been. The plurality of teeth 9b are arranged on the same circumference around the connecting shaft 8.

Further, the locking plate 9 is urged so as to approach the connecting shaft 8 side by a coil spring 10 interposed between the inner surface of the storage space 3d and the locking plate 9.

On the other hand, the operation plate 11 is housed in the housing space 3d of the other holder piece, and is supported by a guide pin 14 provided in the housing space 3d so as to be slidable in the width direction of the holder piece.

The operation plate 11 has a plurality of teeth 11 that are removably engaged with a plurality of teeth 9b of the engagement plate 9. b is formed at the same pitch as the teeth 9b of the locking plate 9. The plurality of teeth l ib are also arranged on the same circumference around the connecting shaft 8.

Further, the operation plate 11 has a locking position where the tooth l ib of the operation plate 11 is engaged with the tooth 9b of the locking plate 9 (the position shown in FIGS. 2, 4 and 5) and the tooth l ib of the operation plate 11 It is slidable along the guide pin 14 over the non-locking position (position shown in FIG. 10) where the tooth 9b force of the locking plate 9 is released, and between the inner surface of the storage space 3d and the operation plate 11 It is always urged and held in the locking position by a plurality of coil springs 12 interposed. Further, the operation plate 11 is provided with a push button 11a for sliding the operation plate 11 at the locking position to the non-locking position by pushing operation. The push button 11a is provided on one side of the operation plate 11, protrudes outward from one cover plate 3B of one holder piece, and can be operated by pushing the operation plate 11 from the locking position to the non-locking position. And

Thus, according to the locking mechanism 6, when the holder 3 is closed from the open position shown in FIG. 3 to the closed position shown in FIG. 2, the locking plate 9 swings around the support pin 13. While moving, each tooth 9b of the locking plate 9 slides on each tooth 1 lb of the operating plate 11 in the locking position and is sequentially locked to each tooth l ib of the operating plate 11, When the holder 3 is stopped from closing, the teeth 9b of the locking plate 9 are locked to the teeth l ib of the operation plate 11 by the biasing force of the coil spring 10 provided on the locking plate 9 side. The interval between the holder pieces 3 'can be kept at a predetermined interval. In this state, as shown in FIG. 10, when the push button 11a is pushed in and the operation plate 11 is slid to the non-locking position by the locking position force, the locking state of the locking plate 9 and the operation plate 11 is released. Both the holder pieces 3 'of the holder 3 are rotated in the opening direction by the elastic force of the elastic body 5 to be in the open position.

[0028] Next, a description will be given of a case where a screw thread that has been crushed such as an anchor bolt or a stud bolt is corrected using the above-described screw thread correction tool 1.

[0029] First, the locking mechanism 6 is operated to bring the holder 3 into the open position, and in this state, the bolts that are intended to correct the two die pieces 2 'held and fixed to the holder pieces 3' in the holder 3 are fixed. The two holder pieces 3 'are piled on the elastic force of the elastic body 5 and closed to the closed position. At this time, both the holder pieces 1, 3 ′ are closed in stages by the locking mechanism 6. [0030] When both holder pieces 1 and 3 'are closed and the holder 3 is moved from the open position to the closed position, the die pieces 2 and 2' held and fixed to the holder pieces 3 and 3 'are formed into an annular shape so that a part of the bolt is removed. At the same time, the holder 3 is held in the closed position by the locking mechanism 6. At this time, the two die pieces 2 'hold the position near the portion where the screw thread of the bolt is normally formed and the screw thread is crushed or cracked. In addition, when the die pieces 2 ′ and 2 ′ hold a part of the bolt, the cutting blades 2a of the die pieces 2 ′ and 2 ′ are screwed into the thread of the bolt.

[0031] Next, hold the holder 3 with the two die pieces 2 'holding the bolt, and rotate the entire thread correction tool 1 around the bolt, and the die 2 screwed with the bolt 2 Move the screw to the side of the screw where the bolt is crushed and pass the part that needs to be corrected. Then, the die 2 function will correct the crushed screw thread and the screw thread that is crushed.

[0032] This thread correction tool 1 has a structure in which a halved die 2 is detachably held and fixed at the center of a polygonal holder 3 that can be freely opened and closed. It is possible to reduce the maximum working radius during rotation of the thread correction tool 1 where the protruding part is connected. As a result, it is possible to reliably and satisfactorily correct the thread of the bolt 15 even in a narrow place as shown in FIG.

In addition, the screw thread correcting tool 1 is configured such that a holder 1 that can be opened and closed between an open / close position and an open position is biased and held by an elastic body 5 to an open position, and a lock mechanism 6 provided on the holder 3 Since the rudder 3 is held in the closed position, when correcting the screw thread of the bolt, the bolt between the two separated die pieces 2 'of the holder 3 which is biased to the open position by the elastic body 5 is used. When the holder 3 is closed to the closed position against the urging force of the elastic body 5, the two die pieces 2 'sandwich the screw thread and the holder 3 is closed by the locking mechanism 6. Held in. As a result, this screw thread correcting tool 1 can quickly and easily fix the bolt, which can be easily closed by simply closing the holder 3 against the urging force of the elastic body 5, and also improves operability. It will be excellent.

Furthermore, since this thread correction tool 1 is composed of a half-shaped die 2 and an openable / closable holder 3, the thread that needs to be corrected when correcting the thread of a long bolt is the bolt. Even if it is far from the tip, the screw 2 can be mounted in the vicinity of the screw thread to be corrected, and the screw thread correction tool 1 can be rotated tens of times with respect to the bolt. The thread can be easily and easily corrected in a short time.

In addition, since this screw thread correcting tool 1 has the die 2 attached to the portion where the normal screw thread of the bolt is formed, the screw thread that was newly formed by the die 2 was originally formed normally. It is formed continuously with the thread, and it is possible to accurately correct the thread of the bolt without the fact that the thread is out of phase.

In addition, this thread correction tool 1 has both holder pieces 3 'and 3' of the holder 3 formed in a substantially rectangular shape, and the outer peripheral edges in the longitudinal direction of both holder pieces 3 'and 3' are formed in a waveform. Because it is configured, it is easy for the operator to grasp the holder 3 when correcting the screw thread of the bolt, and the screw correcting tool 1 itself can be rotated smoothly and smoothly with respect to the bolt, and the operability is also excellent. It will be a thing.

[0033] When the diameter of the bolt to be corrected, the pitch of the screw, etc. change, the die 2 that is held and fixed to the holder 3 is removed, and a new half-shaped shape that matches the bolt to be corrected is removed. Attach the die 2 to the die mounting hole 3a of the holder 3 and correct the screw thread of the bolt with the die 2.

[0034] In this thread correction tool 1, the die 2 held and fixed in the die mounting hole 3a of the holder 3 can be replaced with another half-shaped die 2 having a different screw pitch or the like. Therefore, if the diameter of the bolt to be modified, the pitch of the screw, the type of screw, etc. are changed, it is sufficient to replace only the half-shaped die 2. You only need to have 2 dice. As a result, this thread correction tool 1 can be reduced in cost without having to prepare a plurality of thread correction tools 1, and is easy to store and carry. It becomes.

In addition, when the cutting blade 2a of the die 2 is damaged, it is necessary to replace only the die 2 with a new one. It is also excellent in economic efficiency.

Further, the thread thread correcting tool 1 has a die piece 2 ', 2' that conforms to the shape of the outer peripheral edge of the die piece 2 ', 2' on the inner surface of the notch 3a 'of both holder pieces, 3'. Removable fit Since the recessed portions 3f to be joined are formed respectively, the die pieces 2 'and 2' are fixed to the notch portion 3 force when the die pieces 2 and 2 'are held and fixed to the notch portions 3a' of the holder pieces 3 'and 3'. It becomes difficult to drop off, and the die piece 2 'can be held and fixed to the holder piece 3' smoothly and smoothly.

[0035] In the above-described embodiment, the die 2 is also configured to have two die pieces 2 'and 2' force formed by dividing a circular round die into two in the diametrical direction. 3 ′ and 3 ′ are formed with semicircular cutouts 3a ′, and the inner surface of the cutout 3 is matched with the shape of the outer peripheral edge of the round die pieces 2 ′ and 2 ′. The recess 3f is formed so that the 2 'is detachably fitted. However, in another embodiment, the die 2 is divided into two hexagonal or square dies 2 in the diametrical direction. The formed two die pieces 2 'force also constitutes a polygonal cutout 3 on both holder pieces 3' and 3 ', and a rectangular die piece 3' on the inner surface of the cutout 3a ' A recess 3f in which the die pieces 2 'are detachably fitted in conformity with the shape of the peripheral edge portion may be formed.

[0036] In the above embodiment, the outer shape of the holder 3 is formed in a substantially rectangular shape. However, in other embodiments, the outer shape of the holder 3 is a square, hexagon. You may make it form in a shape or a triangle shape.

[0037] In the above embodiment, the force in which both the holder pieces 3 'are formed by the metal block plate 3A and the two metal cover plates 3B. The holders 1 and 3 'may be integrally formed of a metal material.

[0038] In the above embodiment, both holder pieces 3 'are made of a metal material. In other embodiments, both holder pieces 3' are made of synthetic resin. It may be formed by the block plate 3A and the two synthetic resin cover plates 3B, or both holder pieces 3 'may be formed integrally by a synthetic resin material.

[0039] In the above embodiment, both holder pieces 3 'are formed in slightly different shapes. In other embodiments, both holder pieces 3' are made of a metal material or a composite material. The resin material may be the same size, the same shape and the same structure.

[0040] In the above embodiment, the die pieces 2 'are held by the single fixing screw 4 Force fixed to the notch 3 of the piece 3 'In another embodiment, the die piece 2' is attached to the notch 3a 'of the holder piece 3' by a plurality of fixing screws 4. It may be fixed.

In the above embodiment, the coil spring is used for the elastic body 5. However, in the other embodiments, a plate panel (not shown) is used for the elastic body 5, and the plate panel is used. May be inserted between both holder pieces 3 '.

Claims

The scope of the claims

[1] A die (2) for forming a screw thread and a die mounting hole (3a) for detachably holding the die (2) at the center, and the die mounting hole (3a) is arranged in the diameter direction. A screw thread correcting tool (1) composed of a polygonal holder (3) that opens and closes in two parts, wherein the die (2) is obtained by dividing a round die or a square die into two in the diameter direction. It consists of two formed die pieces (2 '), (2'), and the holder (3) is arranged in parallel on the same plane, and its base ends are connected to each other in a freely rotatable manner. In addition, semi-circular or square cutouts (3) that hold the die pieces (2 '), (2') to form the die attachment holes (3a) are provided at opposite locations in the central part. A pair of plate-shaped holder pieces (3 '), (3') and the respective die pieces (2 '), {held in the notches (3a') of both holder pieces (3 '), (3') 2 ') is fixed to the notch (3a') An elastic body (5) interposed between the fixing screw (4) and the holder pieces (3 '), (3') and biasing the holder pieces (3 '), (3') in the opening direction , Holder pieces (3 '), and the holder pieces (3'), (3 ') are held between the holder holder pieces (3'), (3 '). The die piece),, (2 ') is held in a ring and the locking mechanism (6) is made into a ring, and the closed position where both die pieces), (2') are annular and both die pieces (2 ' ), {2 ') A screw thread correcting tool characterized in that it is configured to be openable and closable over an open position where it is separated.

[2] On the inner surface of the notch (3) of both holder pieces (3 '), (3'), match the shape of the outer peripheral edge of the die pieces (2 '), (2') 2. The thread correction tool according to claim 1, wherein each of the recesses (3f) into which {2 ') is detachably fitted is formed.

[3] Both holder pieces (3 '), (3') are formed in a substantially rectangular shape, and the outer peripheral edges in the longitudinal direction of both holder pieces (3 '), (3') are formed in a waveform. The screw thread correction tool according to claim 1 or 2, characterized by the above.