WO2016021335A1

WO2016021335A1 - Screw thread corrector

Info

Publication number: WO2016021335A1
Application number: PCT/JP2015/068775
Authority: WO
Inventors: 隆志浜口
Original assignee: 隆志浜口
Priority date: 2014-08-08
Filing date: 2015-06-30
Publication date: 2016-02-11
Also published as: TW201609295A

Abstract

　A screw thread corrector (1) for correcting a screw thread of a damaged screw, the screw thread corrector (1) being provided with: a screw thread correcting blade (8) having a plurality of correcting blades (20) arranged in the direction of progress due to rotation of a screw to be corrected, the correcting blades (20) meshing between screw threads of the screw to be corrected; and a contacting means (3) for coming in contact with the screw to be corrected and clamping the screw to be corrected against the screw thread correcting blade (8); an inclined face (21) inclined inward in the thickness direction of the screw thread correcting blade (8) being formed in the cross-section of each correcting blade (20) in the direction orthogonal to the arrangement direction of the correcting blades (20).

Description

Thread corrector

The present invention relates to a thread corrector that corrects a thread of a damaged screw close to the original thread.

Some structures with members fixed with screws can be replaced by removing the screw alone, but there are also structures where the screw is integrated with the structure and cannot be replaced. . In a structure in which a single screw cannot be replaced, when a screw thread is damaged, a situation occurs in which the entire structure must be replaced even though the damaged portion is only the single screw.

For this reason, there has been a demand for a thread corrector capable of correcting a damaged thread with a simple operation. For example, the screw thread corrector described in Patent Document 1 below is capable of screw thread correction in a state where a single screw is integrated with a structure, and has a plurality of blades that match the thread pitch of the screw to be corrected. The screw to be corrected is sandwiched between the blade and the guide roller, and the damaged screw thread is corrected while rotating the screw to be corrected or the screw thread corrector.

JP 2012-101278 A

However, when the present inventor confirmed the actual machine, in the screw thread corrector of Patent Document 1, when the screw to be corrected is pinched strongly, the cutting edge of the screw thread correcting blade is caught by the damaged thread and it becomes difficult to rotate. This is considered to be because the cutting edge of the thread correction blade having a low cutting force tries to push the broken thread of the screw to be corrected straight. For this reason, in the thread corrector of Patent Document 1, it is necessary to finely adjust the pressure for pinching the screw to be corrected very finely according to the damaged state of the thread, and to remove and repair the damaged thread gradually. there were.

On the other hand, if the pressure to clamp the screw to be corrected is weak, the screw to be corrected gets over the guide roller and easily comes off the thread corrector. For this reason, since the screw thread corrector of Patent Document 1 requires technical skill in handling, it has not been possible for anyone to easily perform screw correction.

The present invention solves the conventional problems as described above, and provides a thread corrector that has a high thread correcting ability and can be easily corrected without requiring technical skill. The purpose is to provide.

In order to achieve the above object, a thread corrector according to the present invention is a thread corrector for correcting a thread of a damaged screw, and includes a plurality of screw correctors arranged along a traveling direction by rotation of a corrected screw. A thread correction blade having a correction blade, each correction blade engaging with a thread of the screw to be corrected, and a contact means for contacting the screw to be corrected and sandwiching the screw to be corrected between the thread correction blade; Each of the plurality of correction blades has an inwardly inclined surface formed on an end surface in the thickness direction of the thread correction blade, and the side surface of the correction blade and the inclined surface intersect with each other. An angle that contacts the broken portion of the screw is formed in the ridge line portion, and the angle formed by the inclined surface causes the correction blade to exert an action of cutting the broken portion of the screw. Features.

According to this configuration, since the angle of the correction blade is in contact with the damaged portion of the screw thread in an inclined state, the action of the correction blade corner to push straight through the damaged portion is weakened and the cutting force due to the angle of the correction blade is reduced. Increased and unreasonable cutting is realized. Even after the damaged part has been scraped off by the corner of the correction blade, if the screw to be corrected is further rotated, the side of the correction blade comes into contact with the damaged part, and the damaged part is pushed back toward the original state by the correction blade. The thread is corrected to the original state by plastic deformation. That is, in this embodiment, when the screw to be corrected is rotated by having the inclined surface on the correction blade, cutting of the damaged portion of the correction screw by the correction blade (first stage) and subsequent plastic deformation of the damaged portion are performed. The action of the second stage (second stage) is exhibited, and the screw thread correction becomes smooth and the correction capability is enhanced. As a result, even if the screw to be corrected is firmly sandwiched, the screw to be corrected can be rotated without difficulty, and the screw can be easily corrected without requiring technical skill because of its high ability to correct the thread.

In the thread corrector of the present invention, the inclined surface may be a curved inclined surface. This configuration increases the processing cost, but increases the effect of preventing the correction blade from being caught by the screw to be corrected, and makes the screw thread correction easier.

Moreover, the inclined surface may be formed on both end surfaces in the thickness direction of the thread correction blade. According to this configuration, the thread can be corrected regardless of the rotation direction of the screw to be corrected or the thread corrector.

Further, when the screw thread correcting blade sandwiches the screw to be corrected between the screw thread correcting blade and the abutting means, the intersection of the blade edge of the correcting blade and the inclined surface is the object to be corrected. It is preferable that it is arranged so as to be in contact with the root of the screw.

According to this configuration, when the screw to be corrected and the correction blade are engaged with each other, the outer periphery of the screw to be corrected and the valley bottom of the correction blade come into contact with each other. A gap is formed between the blade base and the outer periphery of the screw to be corrected. This gap prevents the correction blade from being caught by the screw to be fixed even if the screw to be corrected is rotated with the screw to be corrected tightly, making it easy to adjust the pressure to pinch the screw to be corrected, and to correct the thread. It becomes easy.

Furthermore, the gap gradually decreases as the rotation of the screw to be corrected proceeds, and finally disappears at the contact point. As the gap decreases, the damaged portion is gradually pushed back on the side of the correction blade, which acts to plastically deform the damaged portion to the normal position, which is advantageous for thread correction.

According to the present invention, the inclined surface is formed on the correction blade, so that when the screw to be corrected is rotated, the damaged portion of the screw to be corrected is cut by the correction blade (first stage) and the subsequent damaged portion is corrected. The two-stage action of plastic deformation (second stage) is exhibited, and the screw thread correction becomes smooth and the correction ability increases. As a result, even if the screw to be corrected is firmly sandwiched, the screw to be corrected can be rotated without difficulty, and the screw can be easily corrected without requiring technical skill because of its high ability to correct the thread.

The perspective view of the thread corrector which concerns on the 1st Embodiment of this invention. The side view of the thread corrector shown in FIG. FIG. 2 is a plan view of the thread corrector shown in FIG. 1. The front view of the thread corrector shown in FIG. The perspective view which shows the state which mounted | wore the to-be-corrected screw with the thread corrector shown in FIG. The top view of the single unit of the thread ridge correction blade which concerns on one Embodiment of this invention. Sectional drawing in the AA line of FIG. Schematic which shows the damage state of the thread of a to-be-corrected screw. The perspective view which expanded some screw thread correction blades concerning one embodiment of the present invention. The perspective view which expanded a part of screw thread correction blade concerning a comparative example. The figure which shows the principal part at the time of the screw thread correction using the screw thread corrector which concerns on a comparative example. The figure which shows the principal part at the time of the thread correction using the thread corrector which concerns on the 1st Embodiment of this invention. In the 1st Embodiment of this invention, the elements on larger scale which show mesh | engagement with the thread of a to-be-corrected screw, and a correction blade. Sectional drawing in the BB line of FIG. Sectional drawing of the screw thread corrector which concerns on the 2nd Embodiment of this invention. Sectional drawing of the thread corrector which concerns on the 3rd Embodiment of this invention. Sectional drawing of the thread corrector which concerns on another example of the 3rd Embodiment of this invention. Sectional drawing of the screw thread corrector which concerns on the 4th Embodiment of this invention. The perspective view of the screw thread corrector which concerns on the 5th Embodiment of this invention. The perspective view of the screw thread corrector which concerns on the 6th Embodiment of this invention. The perspective view of the thread corrector which concerns on the 7th Embodiment of this invention. The perspective view of the thread corrector which concerns on the 4th Embodiment of this invention.

Hereinafter, a thread corrector according to an embodiment of the present invention will be described with reference to the drawings. The thread corrector according to the present embodiment attaches a corrected screw (a screw in which a part of the thread is broken), and rotates the screw to be corrected or the screw corrector 1 while rotating the screw of the damaged screw. It is an instrument that corrects it close to the original thread. 1 is a perspective view of a thread corrector 1 according to a first embodiment of the present invention, FIG. 2 is a side view, FIG. 3 is a plan view, and FIG. 4 is a front view.

As shown in FIGS. 1 and 2, a guide roller 3, which is a contact means for a screw to be corrected, is rotatably attached to the main body 2 via a shaft 4. The pressure adjusting screw 5 is screwed to the main body 2 and the moving support piece 6. The pressure adjusting screw 5 is integrated with the pressure adjusting knob 7. A thread correction blade 8 is fixed to the moving support piece 6. In this embodiment, the mounting screw 11 is fastened to the moving support piece 6 via the washer 12, and the screw thread correcting blade 8 is fixed to the moving support piece 6.

As shown in FIG. 4, the convex portion 10 of the movable support piece 6 is engaged with the concave groove 9 of the main body 2. By rotating the pressure adjusting knob 7 in FIG. 1, the pressure adjusting screw 5 integrated therewith rotates. In accordance with this rotation direction, the moving support piece 6 moves forward or backward while the convex portion 10 slides along the concave groove 9, and the thread correction blade 8 integrated with the moving support piece 6 also moves back and forth linearly. This makes it possible to adjust the distance between the thread correction blade 8 and the guide roller 3.

FIG. 5 is a perspective view showing a state in which the screw 15 to be corrected is mounted on the thread corrector 1. In advance, the screw 15 to be corrected is disposed between the screw correction blade 8 and the guide roller 3 in a state where the distance between the screw correction blade 8 and the guide roller 3 is larger than the diameter of the screw 15 to be corrected, and the pressure is adjusted. By rotating the knob 7, the screw 15 to be corrected is held in a state of being pressed by the thread correction blade 8 and the guide roller 3. In this state, by rotating the to-be-corrected screw 15 or the thread corrector 1, the damaged portion of the thread 16 of the to-be-corrected screw 15 is corrected by the thread correcting blade 8. Details of this will be described later.

FIG. 6 shows a plan view of a single thread correction blade 8. A plurality of correction blades 20 are formed on each piece of the rectangular thread correction blade 8. Each blade of the plurality of correction blades 20 is arranged along the axial direction of the screw 15 to be corrected shown in FIG. The correction blade 20 is formed so as to mesh with the thread of the screw 15 to be corrected. Each piece of the correction blade 20 of the screw thread correction blade 8 has a different pitch, and can correspond to the corrected screw 15 having a different pitch. Specifically, in FIG. 1, the mounting screw 11 is loosened and the thread correction blade 8 is rotated so that the correction blade 20 facing the guide roller 3 is replaced with the correction blade 20 that matches the pitch of the screw 15 to be corrected. That's fine.

FIG. 7 is a cross-sectional view taken along line AA in FIG. 6, and is a cross-sectional view in a direction orthogonal to the arrangement direction of the correction blade 20. In the cross section of the correction blade 20, an inclined surface 21 inclined inward is formed in the thickness direction of the thread correction blade 8. When the inventor of the present application has the inclined surface 21 and rotates the screw 15 to be corrected, the two-stage action of cutting the damaged portion of the screw 15 to be corrected by the correcting blade 20 and plastic deformation of the damaged portion following the cutting. As a result, it was found that the correction becomes smoother and the correction ability is enhanced. The reason why such an effect can be obtained is considered as follows.

FIG. 8 is a schematic view showing a broken state of the thread of the screw 15 to be corrected. The thread protrudes from the valley bottom 25 toward 26. In the damaged portion 27, the hook 26 is crushed and the screw thread extends in the lateral direction. When the broken portion 27 is largely crushed or when the broken portion 27 is formed on a plurality of screw threads, a situation where the function as a screw is not performed at all may occur.

FIG. 9 is an enlarged perspective view of a part of the thread correction blade 8 according to the present embodiment, and FIG. 10 is an enlarged perspective view of a part of the thread correction blade 54 according to the comparative example. In the thread correction blade 8 according to the present embodiment in FIG. 9, the correction blade 20 has a corner 23 formed at the ridge line where the inclined surface 21 and the side surface 22 intersect. In the thread correction blade 54 according to the comparative example of FIG. 10, there is no shape corresponding to the inclined surface 21, and the correction blade 50 has a corner 53 formed at the ridge line where the flat portion and the side surface 52 intersect. In the correction blade 50 according to the comparative example, the corner 53 is not inclined in the thickness direction of the thread correction blade 54, whereas in the correction blade 20 according to the present embodiment, the corner 23 is the thickness of the thread correction blade 8. Inclined inward in the direction.

FIG. 11 is a diagram showing a main part at the time of thread correction using the thread corrector according to the comparative example. A correction blade 50 is engaged between a thread bottom 25 and a hook 26 of the screw 15 to be corrected. Since the hook 26 is also the outer periphery, the guest 26 is appropriately expressed as the outer periphery 26. Hereinafter, the corrected screw 15 is a right-hand screw. When the screw 15 to be corrected is rotated (in the direction of the arrow b), the damaged portion 27 of the screw 15 to be corrected contacts the corner 53 of the correction blade 50. In this state, the corner 53 contacts the damaged portion 27 in an orthogonal state. When the rotation of the screw 15 to be corrected is advanced in this contact state, the corner 53 tries to push the damaged portion 27 straight as it is.

However, when the present inventor confirmed the actual machine, in the comparative example, when the screw 15 to be corrected is pinched strongly, the broken portion 27 is caught on the corner 53 of the correction blade 50, which makes it difficult to rotate. This is considered to be because the corner 53 is orthogonal to the damaged portion 27 in the comparative example, as shown in FIG.

On the other hand, FIG. 12 is a diagram showing a main part at the time of thread correction using the thread corrector 1 according to the present embodiment shown in FIG. Similarly to FIG. 11, the correction blade 20 is engaged between the thread bottom 25 and the hook 26 of the screw 15 to be corrected. When the screw 15 to be corrected is rotated (in the direction of the arrow b), the damaged portion 27 of the screw 15 to be corrected contacts the corner 23 of the correction blade 20. In this state, the corner 23 comes into contact with the damaged portion 27 in an inclined state. When the rotation of the screw 15 to be corrected proceeds in this contact state, the damaged portion 27 is easily removed by the corner 23.

In this embodiment, the reasonable cutting is realized because the corner 23 is not in contact with the damaged portion 27 in the orthogonal state as in the comparative example, but is in contact with the damaged portion 27 in the inclined state. This is probably because the action of the corner 23 trying to push the damaged portion 27 straight as it is is weakened.

In FIG. 12, even after the corner 23 abuts on the damaged portion 27 and the damaged portion 27 is scraped off, when the screw 15 to be corrected is further rotated (in the direction of arrow b), the corrected blade 20 shown in FIG. Then, the damaged portion 27 is pushed back toward the original state by the correction blade 20, and the thread is corrected to the original state by plastic deformation.

According to the above, in this embodiment, when the correction screw 15 is rotated by having the inclined surface 21 on the correction blade 20, cutting of the damaged portion of the correction screw 15 by the correction blade 20 (first stage) is performed. It is considered that the subsequent two-stage action of plastic deformation (second stage) of the damaged portion is exhibited. That is, since the damaged portion 27 is plastically deformed after cutting, the correction becomes smooth and the correction capability increases.

Here, FIG. 13 is a partially enlarged view showing the engagement between the thread of the screw to be corrected 15 and the correction blade 20. 14 is a cross-sectional view taken along line BB in FIG. In FIG. 14, the screw thread correcting blade 8 is arranged such that the intersection 29 between the cutting edge 30 of the correcting blade 20 and the inclined surface 21 is in contact with the valley bottom 25 of the screw 15 to be corrected. The inventor has found that this configuration is more advantageous in increasing the thread correction capability. Specifically, it is as follows. Note that FIG. 14 is an example, and there is an intersection 29 on the center line 34 that passes through the center 33 of the screw 15 to be corrected. However, the intersection 29 may not be on the center line 34.

14, in the correction blade 20, the valley bottom 32 of the correction blade 20 that meshes with the outer periphery 26 of the screw 15 to be corrected is formed linearly in the vertical direction. For this reason, the outer periphery 26 of the screw 15 to be corrected and the bottom 32 of the correction blade 20 come into contact with each other at the contact 28. On the other hand, since the outer periphery 26 of the correction screw 15 is circular, a gap a is formed between the base 31 of the correction blade 20 and the outer periphery 26 of the correction screw 15. Even if the correction screw 15 is rotated with the correction screw 15 being strongly sandwiched by the gap a, the correction blade 20 is prevented from being caught by the correction screw 15. This facilitates the adjustment of the pressure sandwiching the screw 15 to be corrected, and also facilitates the screw thread correction.

Furthermore, the clearance a gradually becomes smaller as the rotation of the screw 15 to be corrected (in the direction of the arrow b) advances, and finally disappears at the contact 28. As the gap a decreases, the damaged portion 27 is gradually pushed back by the side surface 22 of the correction blade 20, which acts to plastically deform the damaged portion 27 to the normal position, which is advantageous for thread correction.

As mentioned above, although the possible reason was demonstrated about the effect of this invention being demonstrated, this inventor was able to confirm the result along the said content, when actual machine confirmation was performed. In the actual machine according to the present embodiment, even if the screw to be corrected 15 is strongly sandwiched, the screw to be corrected 15 can be rotated without difficulty, and chips are generated during this time. By repeating this correction work several times, the extended portion of the damaged portion 27 shown in FIG. 8 is almost eliminated, and the corrected screw 15 can be restored to a state where it can be actually used.

In the above-described embodiment, the example in which the screw 15 to be corrected is rotated at the time of screw thread correction work has been described, but the thread thread corrector 1 may be rotated. Furthermore, although the to-be-corrected screw 15 has been described as an example of a right-hand screw, it may be a left-hand screw (reverse screw). In this case, the rotation direction during correction may be reversed.

The first embodiment of the present invention has been described above, but the following embodiment may be used. Also in the following embodiments, the principle of screw thread correction is the same as that of the first embodiment. FIG. 15 is a cross-sectional view of the thread corrector according to the second embodiment, and is a cross-sectional view corresponding to FIG. 14 of the first embodiment. In the first embodiment, as shown in FIG. 14, the inclined surface 21 of the correction blade 20 is not curved and is a straight line in the sectional view. On the other hand, in 2nd Embodiment, as shown in FIG. 15, the inclined surface 21 of the correction blade 20 is an inclined surface which inclines and curves inside.

Compared with the first embodiment in which the inclined surface 21 of the correction blade 20 is not curved, the second embodiment increases the processing cost, but the correction blade 20 is prevented from being caught by the screw 15 to be corrected. The effect is higher and the thread correction is easier. As described with reference to FIG. 14, the correction blade 20 is prevented from being caught by the correction screw 15 because the gap between the base 31 of the correction blade 20 and the outer periphery 26 of the correction screw 15 is prevented. The reason for this is that a is formed. In the second embodiment, the inclined surface 21 is curved, so that the gap a is increased.

FIG. 16 is a cross-sectional view of the thread corrector according to the third embodiment, and is a cross-sectional view corresponding to FIG. 14 of the first embodiment. In the first embodiment, as shown in FIG. 14, the inclined surface 21 of the correction blade 20 is formed only on one end face in the thickness direction of the thread correction blade 8. On the other hand, in the third embodiment, as shown in FIG. 16, the inclined surfaces 21 of the correction blade 20 are formed on both end surfaces in the thickness direction of the thread correction blade 8. According to this configuration, the screw thread can be corrected regardless of the rotation direction of the corrected screw 15 or the screw thread correcting device 1. FIG. 17 is another example of the third embodiment, and the inclined surface 21 of the correction blade 20 formed on both end faces is an inclined surface that is curved inwardly in the same manner as in FIG. 15.

17 may be modified as shown in FIG. FIG. 18 is a cross-sectional view of the thread corrector according to the fourth embodiment, and is a cross-sectional view corresponding to FIG. 14 of the first embodiment. FIG. 22 shows a perspective view of a thread corrector according to the fourth embodiment. In FIG. 17, the straight blade tips 30 are interposed between the inclined surfaces 21 at both end surfaces in the thickness direction of the thread correction blade 8, but in FIG. 18, the ends of the inclined surfaces 21 at both end surfaces are the intersections. 29.

19 to 21 show an embodiment relating to the overall configuration of the thread corrector 1. FIG. FIG. 18 shows a perspective view of a thread corrector 1 according to the fifth embodiment of the present invention. 1 is configured to adjust the distance between the guide roller 3 and the thread correction blade 8 by moving the screw thread correction blade 8 back and forth. The configuration of FIG. Is moved forward and backward to adjust the distance between the guide roller 3 and the thread correction blade 8. In FIG. 19, the guide roller 3 is attached to a support body 35, and the support body 35 is engaged with a support plate 36. In this configuration, by rotating the pressure adjustment knob 7 so that the pressure adjustment screw 5 advances, the pressure adjustment screw 5 pushes the support 35, and the support 35 slides along the support plate 36, The distance between the screw thread correcting blade 8 can be adjusted.

FIG. 20 shows a perspective view of a thread corrector according to the sixth embodiment of the present invention. In this figure, when the pressure adjustment knob 7 is rotated, the built-in pressure adjustment screw 5 is rotated, and the support body 37 supporting the thread correction blade 8 integrally with this is moved back and forth. The distance between the screw thread correcting blade 8 can be adjusted.

FIG. 21 shows a perspective view of a thread corrector according to the seventh embodiment of the present invention. In the configuration of FIG. 1, the abutting means for the screw to be corrected is the guide roller 3 that can rotate via the shaft 4, but is formed by a V-shaped member 38 in FIG. 21. Even with this configuration, it is possible to sandwich the screw to be corrected. Further, the abutting means may be configured so that the screw to be corrected can be sandwiched between the screw thread correcting blade 8 and may be another configuration.

DESCRIPTION OF SYMBOLS 1 1st triangular board 2 2nd triangular board 3 Graphic board set 10, 20 Graphic board set 25 Inscribed circle 26, 47 circumscribed circle 27 Outer center (similar center)
28 Inner core 35 Plate member 36

Recess

41, 42, 43, 51, 52, 53, 54, 55 Triangular plate 48 Outer core

Claims

A thread corrector for correcting the thread of a damaged screw,
A thread correction blade having a plurality of correction blades arranged along the advancing direction by rotation of the screw to be corrected, and each correction blade meshing with the thread of the screw to be corrected;
Abutting means for abutting the screw to be corrected and sandwiching the screw to be corrected with the thread correction blade;
Each of the plurality of correction blades is formed with an inclined surface inclined inward on an end surface in the thickness direction of the thread correction blade,
In the part of the ridgeline where the side surface of the correction blade and the inclined surface intersect, an angle that contacts the damaged part of the screw is formed,
The screw thread corrector according to claim 1, wherein an angle formed by the inclined surface causes the correction blade to act to cut a damaged portion of the screw.
The thread corrector according to claim 1, wherein the inclined surface is a curved inclined surface.
The thread corrector according to claim 1, wherein the inclined surface is formed on both end faces in the thickness direction of the thread correcting blade.
The thread correction blade has an intersection between the tip of the correction blade and the inclined surface when the screw to be corrected is sandwiched between the thread correction blade and the contact means. The thread corrector according to claim 1, wherein the thread corrector is disposed so as to be in contact with a valley bottom.