Screw, method for manufacturing screw, and method for putting screw into untightened state

Abstract

The screw itself has a locking effect, and can be safely loosened and returned to the fastened state. Provide a screw that can be used. A first male threaded portion 11 on the tip side and a first male threaded portion 22 are arranged coaxially with each other. The thread 12a has the same shape and pitch as the thread 11a of the screw portion, and the recess 16 The second male threaded portion 12 and the first male threaded portion have a protruding portion protruding from the end face of the second male threaded portion. A connecting rod 13 is formed to be inserted into the recess, and the second male screw portion and the connecting rod are joined together. The first male thread portion and the second male thread portion are joined by a step 15, and the first male thread portion and the second male thread portion are rotated around the axis at a predetermined angle. The threads are out of phase with each other and are threaded at the tip of the first male threaded portion and / or the base of the connecting rod. An engagement portion 17 is provided at the end portion for engaging with a tool for turning the first male threaded portion.

Description

[Technical field]

[0001] The present invention relates to a screw and a method for manufacturing a screw, as well as a method for rendering a screw in an untightened state. [Background technology]

[0002] The screw described in claim 1 of Patent Document 1 has a first male thread portion on the tip side and The thread of the first male screw portion is arranged coaxially with the shaft and has the same shape and pitch as the thread of the first male screw portion. a second male screw portion having a same thread as the first male screw portion; and a connecting rod connecting the first male screw portion and the second male screw portion. and a recess in the second male threaded portion into which the connecting rod is inserted. The connecting rod protrudes from an end surface of the first male threaded portion on the side of the second male threaded portion, The second male thread portion and the connecting rod are connected by a joint means, and the first male thread The first male thread portion and the second male thread portion are threads that are out of phase with each other by a predetermined angle around the axis.

[0003] This screw 110 shown in FIG. 12 (FIG. 1 of Patent Document 1) has a second male screw portion 112 and The first male thread portion 111 is provided with a recess 116 formed in the second male thread portion 112, and the thread 1 The first male screw portion 111 has a head 114 for fastening the screw. A connecting rod 113 protrudes from the base end side, and the connecting rod 113 is welded at a welded portion 115. The threads 111a and 112a have the same shape and a pitch P 11 and pitch P 12 are identical. The threads 111a and 112a are not continuously connected, but are offset by a predetermined angle. When trying to screw the screw 110 into the female thread of a nut or the like, it will enter the female thread at a point out of phase. It is necessary to twist the connecting rod 113 to align the phase. When the second male thread portion 112 enters the female thread, it can be screwed in smoothly. The screw 110 screwed into the female thread is firmly secured by the untwisting of the connecting rod 113. Since the screw is fixed to the female thread of the fastened object, it is revolutionary and does not loosen due to vibration, etc. It becomes. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7411864 Summary of the Invention [Problem to be solved by the invention]

[0005] The screw described in Patent Document 1 exhibits a spontaneous anti-loosening effect by itself, This is a revolutionary new technology compared to the passive loosening of screws using nuts, etc. However, when loosening the screw described in Patent Document 1 after the screw has been fastened, the head 114 is loosened. If you try to pull it out by rotating it in the opposite direction, the connecting rod 1 will move in the opposite direction due to the effect of the action shown in FIG. In this way, the screw described in Patent Document 1 is revolutionary. Instead of having a self-locking effect, it may break when trying to unscrew it and remove it. The drawback is that

[0006] The photograph shown in FIG. 13 shows the actual state of the head 124 of the screw 120 being fastened to the workpiece using a hexagonal wrench. 1 shows the state in which the connecting rod 123 breaks when an attempt is made to remove it from the second male screw. The first male screw portion 122 has a screw thread 122a formed thereon, and the first male screw portion 121 has a screw thread 121a formed thereon. The connecting rod 123 is attached to the base end of the connecting rod 123 by a stop pin 1. The connecting rod 123 is fixed to the head 124 of the second male screw portion 122 by a screw 25. The area around position F has stretched and broken.

[0007] The object of the present invention is to provide a method for fixing a screw by preventing the screw itself from loosening. To provide a screw which has a locking effect and can be safely loosened to a fastened state. It is. [Means for solving the problem]

[0008] The present invention (1) made to solve the above problem comprises a first male thread portion on the tip side, and A thread of the first male thread portion is arranged coaxially with the axis of the first male thread portion and has the same shape and the same pin as the thread of the first male thread portion. a second male threaded portion having a first thread and a recess formed therein; and a front end of the first male threaded portion. A connecting rod is formed to protrude from an end face of the second male screw portion and to be inserted into the recess, The second male thread portion and the connecting rod are connected by a joint means, and the first male thread portion and The second male screw portion is a screw having a predetermined angle phase shift around the axis, The first male threaded portion is turned to the tip end of the first male threaded portion and / or the base end of the connecting rod. It is a screw that has an engaging portion that engages with a tool for turning.

[0009] The screw of the present invention (1) is, for example, a screw having the structure shown in FIG. 2(A). and a tool for rotating the first male screw portion at the tip end of the connecting rod and / or the base end of the connecting rod. Since the connecting rod is provided with an engaging portion, the screw can be released without being stretched. It is possible.

[0010] The present invention (2) is a first male threaded portion on the tip side, the first male threaded portion having a recess formed therein. and a thread of the first male screw portion. and a second male thread portion having a thread of the same pitch, and the second male thread portion has the first male thread. A connecting rod is formed to protrude from the end face on the threaded portion side and to be inserted into the recess, and the first male screw The first male thread portion and the second male thread portion are connected to each other by a connecting means. The male thread portion is a thread that is shifted by a predetermined angle around the axis, and the first male thread An engagement portion is provided at the tip of the first male screw portion for engaging with a tool for rotating the first male screw portion. It is a screw that is needed.

[0011] The screw of the present invention (2) is, for example, a screw having the structure shown in FIG. 2(B). Since the tip of the screw is provided with an engagement portion that engages with a tool for rotating the first male screw portion, , the screw can be untightened without the connecting rod being stretched.

[0012] The present invention (3) is a first male threaded portion on the tip side, and is arranged coaxially with the axis of the first male threaded portion, a second male threaded portion having threads of the same shape and pitch as the threads of the first male threaded portion; and a connecting rod that connects the first male threaded portion and the second male threaded portion, The threaded portion, the second male threaded portion and the connecting rod are separate bodies, and the first male threaded portion has A first recess into which a connecting rod is inserted is formed, and the connecting rod is inserted into the second male thread portion. a second recess into which the first male thread portion, the second male thread portion and the connecting rod are inserted; The first male thread portion and the second male thread portion are joined by a joining means. A screw having a predetermined angle phase difference around an axis, the screw having a tip end of the first male thread portion, and and / or a tool for rotating the first male threaded portion is engaged with the base end of the connecting rod. It is a screw that is provided with an engaging portion.

[0013] The present invention (3) is, for example, a screw having the structure shown in FIG. 2(C). and / or a tool for engaging the first male threaded portion at the proximal end of the connecting rod to rotate the first male threaded portion. Since the connecting rod is provided with an engagement portion, the screw can be released without being stretched. This can be done.

[0014] The present invention (4) is characterized in that the joining means is a locking male screw formed on the base end side of the connecting rod. and a locking female thread formed on the inner surface of the base end side of the recess of the second male thread portion, The male locking thread and the female locking thread are threads of the present invention (1) that screw together.

[0015] The screw of the present invention (4) is, for example, a screw having the structure shown in FIG. A locking male screw formed on the base end side of the connecting rod and a base end of the recess of the second male screw portion and a locking female screw formed on the inner surface of the locking male screw. Since the screws are screwed together, they are less likely to come loose and can be safely put into an untightened state, making it easier to manufacture screws. It becomes easy.

[0016] The present invention (5) is characterized in that the joining means is a locking male screw formed on the tip side of the connecting rod. and a locking female thread formed on the inner surface of the tip side of the recess of the first male thread portion. The male locking thread and the female locking thread are threads of the present invention (2) that screw together.

[0017] The screw of the present invention (5) is, for example, a screw having the structure shown in FIG. A locking male screw formed on the end side of the first male screw portion and a locking male screw formed on the inner surface of the tip side of the recess of the first male screw portion The locking male screw and the locking female screw are screwed together, so that the locking male screw and the locking female screw are not loosened. This makes it easier to manufacture screws that are less likely to break and can be safely put into an untightened state.

[0018] The present invention (6) includes a step of preparing a member for a first male thread portion on which the locking male thread is formed. and a step of preparing a member for a second male screw portion in which the female screw for locking and the recess are formed. and a groove is interposed between the opposing surfaces of the first member for male thread portion and the second member for male thread portion, and the groove is formed by the following formula: (1) A step of preparing a spacer having a thickness T calculated by the above formula; The locking male screw and the second male screw member are attached to each other with the spacer therebetween. and assembling the female thread for locking to prepare a screw member; The threads on the outer periphery of the member are formed across the first male thread member and the second male thread member. and releasing the engagement between the locking male screw and the locking female screw to remove the spacer. removing the laser, and removing the first male screw member having the thread formed thereon and the screw. The second male threaded portion member having a thread formed thereon is connected to the male locking screw and the female locking screw. and screwing the two together to assemble the two screws. It is. Formula (1) T=P×(360°−α°) / 360° P; Thread pitch α°: Phase shift angle between the first male thread portion and the second male thread portion

[0019] The present invention (6) is, for example, a method for manufacturing a screw as shown in FIG. 7. According to this manufacturing method, This makes it easier to manufacture screws that are less likely to loosen and that can be safely put into an untightened state.

[0020] The present invention (7) includes a step of preparing a member for a first male thread portion on which the locking male thread is formed. The tip side is calculated by the following formula (2). preparing a member for a second male thread portion that is longer than a predetermined dimension by a dimension L that is provided by the first male thread portion; The threaded portion member and the second male threaded portion member are connected to the locking male thread and the locking female thread. A step of preparing a screw member by screwing and assembling the screw member, and threading the outer periphery of the screw member forming the first male thread portion member and the second male thread portion member; The tip side of the second male threaded portion member is set to the dimension L 1 and removing only the thread. The first male screw portion member is formed with the thread and has a tip end with a dimension L 1 Only The second male screw portion member is screwed into the male locking screw and the female locking screw. and assembling the screw. Formula (2)L 1 =P×(360°-α°) / 360° P; Thread pitch α°: Phase shift angle between the first male thread portion and the second male thread portion

[0021] The present invention (7) is, for example, a method for manufacturing a screw as shown in FIG. 8. According to this manufacturing method, This makes it easier to manufacture screws that are less likely to loosen and that can be safely put into an untightened state.

[0022] The present invention (8) is a method for forming the recess and the female thread for engagement, the calculation being carried out according to the following formula (3). Dimension L 2preparing a member for a first male thread portion, the member having a base end side longer than a predetermined dimension by , A step of preparing a second male screw member on which the locking male screw is formed; The threaded portion member and the second male threaded portion member are connected to the locking male thread and the locking female thread. A step of preparing a screw member by screwing and assembling the screw member, and threading the outer periphery of the screw member forming the first male thread portion member and the second male thread portion member; The base end side of the first male threaded portion member is set to the dimension L 2 and removing only the thread. The base end is dimension L 2 The first male screw portion member is cut out, and the thread is formed. The second male screw portion member is screwed into the male locking screw and the female locking screw. and assembling the screw. Formula (3)L 2 =P×(360°-α°) / 360° P; Thread pitch α°: Phase shift angle between the first male thread portion and the second male thread portion

[0023] The present invention (8) is, for example, a method for manufacturing a screw shown in FIG. 9. According to this manufacturing method, This makes it easier to manufacture screws that are less likely to loosen and that can be safely put into an untightened state.

[0024] The present invention (9) is a method for untightening a screw according to any one of the present inventions (1) to (5) that has been fastened to a fastened body. A method for setting the engagement portion to a state, comprising the steps of: engaging the engagement portion with the tool; and rotating the screw in a direction to loosen the screw. do.

[0025] According to the method of the present invention (9), a screw that is difficult to loosen can be safely put into an untightened state. . Effect of the Invention

[0026] According to the present invention, the screw itself has a locking effect, and can be safely loosened and put into an untightened state. A screw may be provided. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is a perspective view of a screw according to a first embodiment of the present invention. [Diagram 2] FIG. 2(A) is a cross-sectional view of a first embodiment of the screw of the present invention, FIG. 2(B) is a cross-sectional view of a second embodiment, and FIG. 2(C) is a cross-sectional view of a third embodiment. [Diagram 3] FIG. 3(A) is a cross-sectional view of a fourth embodiment of the screw of the present invention, and FIG. 3(B) is a cross-sectional view of a fifth embodiment. [Figure 4] 4(A) to 4(C) are schematic diagrams showing the mechanism of the present invention. [Diagram 5] FIG. 11 is a cross-sectional view of a sixth embodiment of the screw of the present invention. [Figure 6] FIG. 11 is a cross-sectional view of a seventh embodiment of the screw of the present invention. [Figure 7] FIG. 1 is a schematic diagram showing an example of the production method of the present invention (6). [Figure 8] FIG. 1 is a schematic diagram showing an example of the production method of the present invention (7). [Figure 9] FIG. 1 is a schematic diagram showing an example of a production method according to the present invention (8). [Figure 10] FIG. 13 is a schematic diagram showing one method for safely untightening the screw of the present invention. [Figure 11] FIG. 13 is a schematic diagram showing one method for safely untightening the screw of the present invention. [Figure 12] FIG. 1 is a partial cross-sectional view showing the structure of the screw described in Patent Document 1. [Figure 13] 1 is a photograph showing the state of damage to the screw described in Patent Document 1 when the head of the screw is twisted in the direction of loosening. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. These are essentially preferred examples and are not intended to limit the scope of the invention, its applications, or its uses. It is not intended to

[0029] FIG. 1 is a perspective view of a first embodiment of the screw of the present invention. The screw 10 has a first male thread portion 1. 1. A second male thread portion 12 is provided, and the thread 11a and the thread 12a are aligned at the boundary between the two male thread portions. The phases are shifted by a predetermined angle. 2(A) is provided. The connecting rod 13 is connected to the head 14 by a stop pin 15. They are combined. A locking portion 17 is formed at the tip of the first male screw portion 11. A wrench or the like is applied to the locking portion 17. When the tool is attached and rotated in the loosening direction, the screw 10 is safely put into an untightened state. The locking portion 17 is a hexagonal hole, but it can be a Phillips groove, a flathead groove, or a Torx (commercially available) Marking) Holes etc. are acceptable.

[0030] FIG. 2(A) is a cross-sectional view of the screw of the first embodiment shown in FIG. 1, and the parts described in FIG. The connecting rod 13 is inserted into a recess 16 inside the second male screw portion 12. is.

[0031] FIG. 2(B) is a cross-sectional view of the second embodiment. The screw 20 has a head 24 and a connecting rod 23. The second male screw portion 22 has a screw thread 22a formed therein, and a recess 26 is formed therein. The connecting rod 23 and the first male screw portion 21 are fixed to each other. The first male screw portion 21 is connected to the first male screw portion 25 by a locking portion 27 formed at the tip thereof. By loosening the screw 27 using a tool such as a wrench, the screw 20 can be safely put into an unfastened state. do.

[0032] FIG. 2C is a cross-sectional view of the third embodiment, in which the screw 30 has a head 34 and a thread 32. a is engraved on the second male screw portion 32 having a second recess 36b formed therein, and a screw thread 31a is engraved on the second male screw portion 32 having a second recess 36b formed therein. The first male screw portion 31 having the first recess 36a formed therein and the first recess 36a and the second recess 36b are The first male thread portion 31 and the second male thread portion 32 are inserted into the first male thread portion 31 and the second male thread portion 32 by two locking pins 35. The connecting rod 33 is connected to the first male screw portion 31. The locking portion 37 is fixed to the tip of the first male screw portion 31. When a tool such as a wrench is attached to the locking portion 17 and the locking portion 17 is rotated in the loosening direction, , the screw 30 can be safely left in an untightened state.

[0033] FIG. 3(A) is a cross-sectional view of a fourth embodiment of the screw of the present invention. The screw 40 is the same as that shown in FIG. ) screw, the difference being that the base end of the connecting rod 43 also has a locking portion. 47b is formed. Adding 30 to the symbol in FIG. 2(A) gives the symbol in FIG. 3(A). Since it matches, details are omitted. Attach a tool such as a wrench to either the locking portion 47a or the locking portion 47b and turn it in the loosening direction. By turning the screw 40, the screw 40 can be safely put into an unfastened state, which makes it easier to remove the screw. Convenience improves.

[0034] FIG. 3(B) is a cross-sectional view of the fifth embodiment of the screw of the present invention. The screw 50 is the same as that shown in FIG. ) thread, the difference being that the base end of the connecting rod 53 also has a second engagement thread. 2(A) is added to the reference numeral 20, the reference numeral 20 in FIG. The symbols are the same, so detailed explanations will be omitted. Attach a tool such as a wrench to either the locking portion 57a ​​or the locking portion 57b and turn it in the direction to loosen it. By turning the screw 50, the screw 50 can be safely put into an unfastened state, which makes it easier to remove the screw. Convenience improves.

[0035] 4(A) to 4(C) are schematic diagrams showing the mechanism of the present invention. FIG. 4(A) shows a female screw. A screw 10 is used to fasten a plate 1 with a groove 1a and a plate 2 with a through hole 2a. The screw 10 has a thread 11a of a first male screw portion 11 and a thread 11b of a second male screw portion 12. In order to eliminate the phase difference between the head 14 and the head 12a, a torque T 1 This shows where the Torque T 1 As a result, the connecting rod 13 is twisted as shown by the dotted and thin lines in the figure. .

[0036] FIG. 4B shows the state in which the second male thread portion 12 is screwed into the female thread 1a of the plate 1, and the head 14 is then removed. Torque T in the loosening direction 2 The connecting rod 13 has a connecting Untwisting torque t of rod 13 1 and torque T 2 Torque by t 2 It is being linked. The base end of the rod 13 is subjected to a twisting torque t 1 and torque T 2 By Tor Kt 2 It is taking. 1 and 2 When these are equal, the torque applied to the first male thread portion 11 is At this point, the first male screw portion 11 can finally start moving. The base end of 13 is t1 +t 2 =2t 1 At that time, the torque is applied to the second male thread. Since 12 can move to the right by then, the connecting rod 13 extends. If the angle exceeds this, the connecting rod 13 will break. This causes the head 14 to rotate and loosen the screw 10. This is the mechanism by which the connecting rod 13 is damaged.

[0037] FIG. 4C shows how a wrench or the like is applied to the locking portion 17 on the tip side of the first male thread portion 11 and torque is applied. T 3 The figure shows the state where the connecting rod 10 is loosened by applying pressure to the connecting rod 10. The torque of 13 is t 1 and 3 is applied in the opposite direction, and the base end side of the connecting rod 13 is 1 and 3 are applied in the same direction. 1 and 3 When these become equal, the torque on the tip side of the connecting rod 13 is The torque on the base end of the connecting rod 13 becomes zero. 1 This situation is shown in Fig. 4(B) and The first male thread portion 11 and the second male thread portion 12 are the same, but differ in terms of displacement. Since they are connected without the intervention of a large mechanism, the displacement of the first male screw portion 11 on the driving side is greater than the displacement of the first male screw portion 11 on the passive side. The displacement of the second male screw portion 12 does not become large. As a result, when the screw 10 is loosened by using the locking portion 17, the connecting rod 1 Since 3 does not stretch, screw 10 can be removed safely.

[0038] FIG. 5 is a cross-sectional view of the sixth embodiment of the screw of the present invention, which is the same as the fourth embodiment shown in FIG. In the point that a locking male screw 65a and a locking female screw 65b are used instead of the locking pin 45 of The screw 60 has a head 64, a recess 66 formed therein, and a thread 62a formed therein. A second male threaded portion 62 and a first male threaded portion 61 having a thread 61a and a connecting rod 63. The first locking portion 67a at the tip end side of the first male screw portion 61 and the base end side of the connecting rod 63 are The first male screw portion 61 can be driven by using either of the first and second locking portions 67b. Since the connecting rod 63 is on the side of the screw 60, the connecting rod 63 does not stretch and the screw 60 can be safely put into the untightened state. This can be done.

[0039] FIG. 6 is a diagram showing the screw of the present invention. EMBODIMENT 7 1 is a cross-sectional view of Figure 2(B) Shown in EMBODIMENT 2 of Stop pin 25 Instead of the above, a male locking screw 75a and a female locking screw 75b are used. The screw 70 has a head 74, a thread 71a, and a connecting rod 73. The second male screw portion 72 and the first male screw portion 71 having a thread 71a are provided. The threaded portion 71 is provided with a locking portion 77 at the tip end thereof. When the locking portion 77 is used, the first male threaded portion 7 Since the connecting rod 73 does not extend, the screw 70 can be safely put into an untightened state. It can be.

[0040] FIG. 7 is a schematic diagram showing a manufacturing method of the screw 60 shown in FIG. 5. As shown in FIG. The second male threaded portion material 62M has a head 64, a locking female thread 65b, and a recess 66 formed therein. However, the threads have not yet been engraved. The first male screw portion material 61M includes a first locking portion 67a, a locking male screw 65a, and a connecting rod 63. is formed but has no threads yet. A spacer 68 is sandwiched between the first male thread portion 61 and the second male thread portion 62. The thickness T of the pacer 68 is calculated by the formula (1) T = P × (360 ° - α °) / 360 °, Here, P is the pitch of the thread, and α° is the phase difference between the first male thread portion and the second male thread portion. This is the deviation angle.

[0041] In the state shown in FIG. 7(A), the screw threads 61a and 62a are engraved. The spacer 68 is still Since the threads 61a and 62a are interposed, no phase difference occurs between the threads 61a and 62a. As shown in (C), when the spacer 68 is removed and the screw thread 61a and the screw thread 62a are assembled, A phase difference of α° occurs between the two, and the screw 60 is completed.

[0042] FIG. 8 is a schematic diagram showing another method of manufacturing the screw 60 shown in FIG. The second male threaded portion material 62M has a head 64, a female thread 65b for locking, and a recess 66. The screw is attached but has no threads yet. The first male screw portion material 61M includes a first locking portion 67a, a locking male screw 65a, and a connecting rod 63. is formed but has no threads yet. The second male threaded portion material 62M has a surplus tip portion 62m formed at the tip. Axial length L of 2m 1 teeth, Formula (2)L 1 = P × (360° - α°) / 360°, where P is the thread pitch and α° is the phase shift angle between the first male thread portion and the second male thread portion.

[0043] If threads 61a and 62a are engraved in the state shown in FIG. 8(A), the result will be FIG. 8(B). Since the excess tip portion 62m is interposed, the phase difference between the thread 61a and the thread 62a is As shown in Figure 8(C), when the excess tip 62m is cut off and assembled, the screw A phase difference of α° occurs between the thread 61a and the thread 62a, and the screw 60 is completed.

[0044] FIG. 9 is a schematic diagram showing another method of manufacturing the screw 70 shown in FIG. The second male threaded portion material 72M includes a head 74, a connecting rod 73, and a male thread 75b for locking. The screw is attached but not yet threaded. The first male thread material 71M is formed with a locking portion 77, a female thread 75b for locking, and a recess 76. The screw is attached but has no threads yet. The first male thread material 71M has a surplus tip portion 71m formed at the base end. Axial length L of 1m 2 teeth, Formula (3)L 2 = P × (360° - α°) / 360°, where P is the thread pitch and α° is the phase shift angle between the first male thread portion and the second male thread portion.

[0045] If threads 71a and 72a are engraved in the state shown in FIG. 9(A), the state shown in FIG. 9(B) will result. Since the excess tip portion 71m is interposed, the phase difference between the thread 71a and the thread 72a is As shown in Figure 9(C), when the excess tip 71m is cut off and assembled, the screw A phase difference of α° occurs between thread 71a and thread 72a, and screw 70 is completed.

[0046] FIG. 10 is a schematic diagram showing one method of safely untightening the screw of the present invention. 0 includes a head 84, a recess 86, a second male threaded portion 82 having a thread 82a, a connecting rod 83 and The first male screw portion 81 has a thread 81a. The first male screw portion 81 and the second male screw portion 82 The stop pin 85 is inserted into the through hole 88b and has a tip As shown in the figure, the through hole 88a is also formed in the axial direction. In order to safely release the screw 80 from the fastened state after the screw 80 has been fastened to the workpiece, The first male screw portion 81 and the second male screw portion 82 can be separated from each other. A method of inserting a blade-shaped push pin 89a from above in the axial direction into the through hole 88a and hammering it As a result, the locking pin 85 is removed to the left, and the first male thread portion 81 and the second male thread portion 82 are disconnected. can be separated. Another method is to insert the push pin 89b into the through hole 88b and hammer it from right to left. As a result, the locking pin 85 is removed to the left, and the first male thread portion 81 and the second male thread The section 82 can be separated.

[0047] FIG. 11 is a schematic diagram showing one method of safely disengaging the screw of the present invention. 0 includes a head 94, a recess 96, a second male threaded portion 92 having a thread 92a, a connecting rod 93, and The first male thread portion 91 has a thread 91a. The first male thread portion 91 and the second male thread portion 92 The C-ring 97 is fitted into a connecting recess 98. The head 94 and the connecting rod 93 are connected to each other. In order to safely release the screw 90 after the screw 90 has been fastened to the workpiece, The first male screw portion 91 and the second male screw portion 92 are simply separated from each other. When the special tool is inserted and the C-ring 97 is pulled inward, it comes out of the connection recess 98. The threaded portion 91 and the second male threaded portion 92 can be separated. [Industrial Applicability]

[0048] As described above, the present invention provides a screw that has a locking effect on the screw itself and can be loosened safely. A screw that can be fastened can be provided. [Explanation of symbols]

[0049] 1 board 1a Female thread 2 boards 2a Through hole 10, 20, 30, 40, 50, 60, 70, 80, 90 Screw 11, 21, 31, 41, 51, 61, 71, 81, 91 First male thread 11a, 21a, 31a, 41a, 51a, 61a, 71a, 81a, 91a thread (Male thread) 12, 22, 32, 42, 52, 62, 72, 82, 92 Second male thread 12a, 22a, 32a, 42a, 52a, 62a, 72a, 82a, 92a thread (Male thread) 13, 23, 33, 43, 53, 63, 73, 83, 93 Connecting rod 14, 24, 34, 44, 54, 64, 74, 84, 94 head 15, 25, 35, 45, 55, 85, 95 Locking pin (jointing means) 65a, 75a, locking male screw 65b, 75b, female thread for locking 16, 26, 46, 66, 76, 86, 96 recesses 36a, 56a 1st recess 36b, 56b 2nd recess 17, 27, 37, 77 Locking part 47a, 57a, 67a 1st locking part 47b, 57b, 67b 2nd locking part 61M, 1st male thread material 62M, 2nd male thread material 62m excess tip 68 Spacer 72M Second male thread material 72m excess tip 88a, 88b through hole 89a, 89b Push pin 97 C-Ring 98 Connection recess 99 holes

Claims

1. A first male thread portion on a tip side; A thread of the first male thread portion is disposed coaxially with the axis of the first male thread portion and has the same shape as the thread of the first male thread portion. and a second male threaded portion having a thread of the same pitch and a recess formed therein, The first male thread portion has a protruding end surface on the side of the second male thread portion and is inserted into the recess. A connecting rod is formed, The second male threaded portion and the connecting rod are connected by a joint means, The first male thread portion and the second male thread portion are out of phase with each other by a predetermined angle around the axis. A screw having a The first male thread is provided at the tip end of the first male thread portion and / or at the base end of the connecting rod. A screw having an engaging portion that engages with a tool for rotating the screw portion.

2. A first male threaded portion on a tip side, the first male threaded portion having a recess formed therein; A thread of the first male thread portion is disposed coaxially with the axis of the first male thread portion and has the same shape as the thread of the first male thread portion. and a second male threaded portion having a thread of the same pitch, The second male thread portion has a protruding end surface on the side of the first male thread portion and is inserted into the recess. A connecting rod is formed, The first male threaded portion and the connecting rod are connected by a joint means, The first male thread portion and the second male thread portion are out of phase with each other by a predetermined angle around the axis. A screw having a An engagement tool for engaging with the tip end of the first male threaded portion to rotate the first male threaded portion. A screw provided with a recess.

3. A first male thread portion on a tip side; A thread of the first male thread portion is disposed coaxially with the axis of the first male thread portion and has the same shape as the thread of the first male thread portion. and a second male thread portion having a thread of the same pitch; a connecting rod connecting the first male thread portion and the second male thread portion, The first male thread portion, the second male thread portion, and the connecting rod are separate bodies, and the first male thread portion The connecting rod is inserted into a first recess formed in the second male threaded portion. A second recess into which a connecting rod is inserted is formed, and the first male thread portion, the second male thread portion and the front The connecting rod is connected by a joint means, and the first male thread portion and the second male thread portion are The portion is a screw having a predetermined angle phase shift around the axis, The first male screw is attached to a tip end of the first male screw portion and / or a base end of the connecting rod. A screw having an engaging portion that engages with a tool for rotating the screw portion.

4. The connecting means includes a locking male screw formed on the base end side of the connecting rod and the second male screw. and a locking female thread formed on the inner surface of the base end side of the recess of the screw portion, The screw according to claim 1 , wherein the screw is in threaded engagement with the female locking thread.

5. The connecting means includes a locking male screw formed on the tip end side of the connecting rod and the first male screw. and a locking female screw formed on the inner surface of the tip side of the recess of the screw portion, The screw according to claim 2, wherein the screw is in threaded engagement with the female locking thread.

6. A step of preparing a first male threaded portion member on which the locking male thread is formed; preparing a second male-threaded member having the locking female thread and the recess; 、 The first male thread portion member and the second male thread portion member are interposed between opposing surfaces of the member and the second male thread portion member, and the following formula (1 preparing a spacer having a thickness T calculated by The first male thread portion member and the second male thread portion member are arranged with the spacer therebetween. A step of assembling the locking male screw and the locking female screw by screwing them together to prepare a screw member. and, The threads on the outer periphery of the screw member are threaded by the first male thread member and the second male thread member. forming a conductor over the material; The male and female locking screws are released from each other, and the spacer is removed. Steps and The first male threaded member having the thread formed thereon and the second male threaded member having the thread formed thereon The screw member is assembled by screwing the male screw and the female screw together. The method for manufacturing a screw according to claim 4 or 5, further comprising: Formula (1) T=P×(360°−α°) / 360° P: Thread pitch α°: phase shift angle between the first male thread portion and the second male thread portion

7. A step of preparing a first male threaded portion member on which the locking male thread is formed; The female thread and the recess are formed, and the tip side has a dimension calculated by the following formula (2). preparing a second male threaded portion member that is longer than a predetermined dimension by a length L1; The first male threaded portion member and the second male threaded portion member are connected to the locking male screw and the locking male screw. preparing a screw member by screwing and assembling the female screw; The threads on the outer periphery of the screw member are threaded by the first male thread member and the second male thread member. forming a conductor over the material; The tip side of the second male threaded portion member is set to the dimension L １ and removing only the The first male screw portion member having the screw thread formed thereon, and the tip side of the first male screw portion member having the screw thread formed thereon Dimension L １ The second male screw portion member from which only the first male screw portion is cut is connected to the locking male screw and the locking The method for manufacturing a screw according to claim 4, further comprising the step of assembling the female thread by screwing the female thread. Formula (2) L １ =P×(36°-α°) / 36° P: Thread pitch α°: phase shift angle between the first male thread portion and the second male thread portion

8. The recess and the female screw are formed, and the dimension L is calculated by the following formula (3). 2 Only place A step of preparing a member for a first male thread portion, the member having a base end side longer than a fixed dimension; preparing a member for a second male thread portion on which the locking male thread is formed; The first male threaded portion member and the second male threaded portion member are connected to the locking male screw and the locking male screw. preparing a screw member by screwing and assembling the female screw; The threads on the outer periphery of the screw member are threaded by the first male thread member and the second male thread member. forming a conductor over the material; The base end side of the first male thread portion member is set to the dimension L ２ and removing only the The screw thread is formed, and the base end side has a dimension L ２ the first male thread portion member from which only the first male thread portion is cut off; The second male screw portion member on which the screw thread is formed is connected to the locking male screw and the locking The method for manufacturing a screw according to claim 5, further comprising the step of assembling the female thread by screwing the female thread. Formula (3) L ２ =P×(36°-α°) / 36° P: Thread pitch α°: phase shift angle between the first male thread portion and the second male thread portion

9. The screw according to any one of claims 1 to 5 which has been fastened to a fastened body is put into an untightened state.

1. A method comprising: Engaging the tool with the engagement portion; and rotating the tool in a direction to loosen the screw. How to make it.

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