Screw, method for manufacturing screw, and method for bringing screw into non-fastened state

Abstract

To provide a screw that itself has a loosening-prevention effect, and that can be safely loosened to bring it into a non-fastened state.SOLUTION: A screw includes: a first male screw portion 11 located on the tip side; a second male screw portion 12 which is disposed coaxially with the axis of the first male screw portion, and has thread ridges 12a of the same shape and the same pitch as the thread ridges 11a of the first male screw portion, and in which a recess 16 is formed; and a connecting rod 13 that protrudes from an end surface on the second male screw portion side of the first male screw portion and is inserted into the recess. The second male screw portion and the connecting rod are joined by joining means 15, and the first male screw portion and the second male screw portion are angularly offset from each other by a predetermined phase angle around the axis. An engagement portion 17 with which a tool for rotating the first male screw portion engages is provided at the tip end of the first male screw portion and / or at the base end of the connecting rod.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a screw, a method for manufacturing a screw, and a method for disengaging a screw. [Background technology]

[0002] The screw described in claim 1 of Patent Document 1 has a first male thread portion on the tip side and a 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 thread, and a connecting rod connecting the first male screw portion and the second male screw portion. and a second male threaded portion having a recess 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 threaded portion and the second male threaded 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 thread portion 112 and The first male threaded portion 111 has a recess 116 formed in the second male threaded portion 112, and the second male threaded portion 112 has a thread 1 The first male thread portion 111 has a head 114 for fastening the screw. The connecting rod 113 protrudes from the base end side, and the connecting rod 113 is welded at a welded portion 115. The thread 111a and the thread 112a have the same shape and a pitch P 11 and Pitch P 12 are identical. The threads 111a and 112a are not connected continuously, but are offset by a predetermined angle. When screw 110 is screwed into a female thread of a nut or the like, it enters the female thread at a position out of phase. It is necessary to twist the connecting rod 113 to adjust 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. This 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 locking effect by itself, so This is a revolutionary new technology compared to passive screws that are difficult to loosen using nuts, etc. However, when loosening the screw described in Patent Document 1 after fastening the screw, the head 114 is loosened. When you try to remove it by rotating it in the opposite direction, the connecting rod 1 In this way, the screw described in Patent Document 1 is revolutionary. Although it has a self-locking effect, it may break if you try to unscrew it and remove it. The drawback is that

[0006] The photograph shown in FIG. 13 shows the actual screw head 124 of the screw 120 being fastened to the object to be fastened using a hexagonal wrench. The figure 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 locking pin 1. 25 to the head 124 of the second male screw portion 122. The connecting rod 123 is The area around position F has stretched and broken.

[0007] The object of the present invention has been made in view of the above points, and its object is to prevent the screw itself from loosening. To provide a screw which has a locking effect and can be safely loosened to a fastened state. is. [Means for solving the problem]

[0008] The present invention (1) made to solve the above problem is a first male thread portion on the tip side, 1. A thread having the same shape and pin as the thread of the first male thread portion is arranged coaxially with the axis of the first male thread portion. a second male threaded portion having a recess formed therein, and a front end of the first male threaded portion; a connecting rod is formed to protrude from the end face on the second male thread portion side and to be inserted into the recess; The second male threaded portion and the connecting rod are connected by a connecting means, and the first male threaded portion and The second male screw portion is a screw that is shifted in phase by a predetermined angle around the axis, The first male screw portion is turned to the tip end of the first male screw 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 Figure 2(A). and / or a tool for turning the first male threaded 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, which is disposed coaxially with the axis of the first male screw portion and has the same shape as the thread of the first male screw portion. and a second male screw portion having a thread of the same pitch, and the second male screw portion has the first male screw 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 thread The first male threaded portion and the second male threaded portion are connected by a connecting means. The male thread portion is a thread that is shifted in phase by a predetermined angle around the axis, and the first male thread An engaging portion is provided at the tip of the first male screw portion to engage 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 Figure 2(B). The tip of the screw is provided with an engaging portion that engages with a tool for rotating the first male screw portion. The screw can be released 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 the 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 threaded portion, the second male threaded 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 angular phase difference around an axis, the screw including a tip of the first male thread portion, and and / or a tool for engaging with the base end of the connecting rod to rotate the first male thread portion. It is a screw equipped with an engaging portion.

[0013] The present invention (3) is, for example, a screw having the structure shown in Figure 2(C). and / or a proximal end of the connecting rod that engages with a tool for turning the first male threaded portion. Since the connecting rod is provided with an engaging 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 screw formed on the inner surface of the base end side of the recess of the second male screw portion, The male locking screw and the female locking screw are threads of the present invention (1) that are screwed together.

[0015] The screw of the present invention (4) is, for example, a screw having the structure shown in FIG. 5. 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 threaded portion; The locking male screw and the locking female screw are formed on the inner surface of the locking male screw. Since the screws are screwed together, they are difficult to loosen and can be safely untightened, making it easy 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 screw formed on the inner surface of the tip side of the recess of the first male screw portion, The male locking screw and the female locking screw are threads of the present invention (2) that are threaded together.

[0017] The screw of the present invention (5) is, for example, a screw having the structure shown in Figure 6. a locking male screw formed on the end side of the first male threaded portion and a locking male screw formed on the inner surface of the tip side of the recess of the first male threaded portion; The locking male screw and the locking female screw are threaded together, so that the locking male screw and the locking female screw are not loosened. This makes it easier to manufacture screws that are unsightly and can be safely put into an untightened state.

[0018] The present invention (6) provides 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 thread portion in which the female thread for locking and the recess are formed. and a screw is interposed between the opposing surfaces of the first member for male thread portion and the second member for male thread portion, and (1) A step of preparing a spacer having a thickness T calculated by (1), and The locking male screw and the second male screw member are connected to each other with the spacer interposed therebetween. and the female thread for locking are screwed together to prepare a screw member; The threads on the outer periphery of the member are formed across the first male thread portion member and the second male thread portion member. and a step of releasing the engagement between the locking male screw and the locking female screw to remove the space. removing the laser, and removing the first male threaded portion member 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 assembling the screws by screwing them together. 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 shown in FIG. 7, and according to this manufacturing method, This makes it easier to manufacture screws that are less likely to loosen and can be safely put into an untightened state.

[0020] The present invention (7) provides 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 to be obtained by inserting the first male thread portion into the second male thread portion; The threaded portion member and the second male threaded portion member are connected to the locking male screw and the locking female screw. A step of screwing and assembling the screw members to prepare a screw member; forming the first male thread portion member and the second male thread portion member across the first male thread portion member; a step of cutting off the tip side of the second male thread portion member by the dimension L1; The first male screw portion member is formed with the threads, and the tip side is cut off by a dimension L1. The second male screw portion member is screwed together with the male locking screw and the female locking screw. and assembling the screws. Formula (2) L1=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 shown in FIG. 8, and according to this manufacturing method, This makes it easier to manufacture screws that are less likely to loosen and can be safely put into an untightened state.

[0022] The present invention (8) is a method for manufacturing a bearing in which the recess and the female thread for locking are formed, and the following formula (3) is used to calculate the preparing a member for a first male thread portion, the member being longer on the base end side than the predetermined dimension by a dimension L2 to be , a step of preparing a second male threaded portion member on which the locking male thread is formed; The threaded portion member and the second male threaded portion member are connected to the locking male screw and the locking female screw. A step of screwing and assembling the screw members to prepare a screw member; forming the first male thread portion member and the second male thread portion member across the first male thread portion member; a step of cutting off the base end side of the first male thread portion member by the dimension L2; The first male screw portion member is formed, and the base end side is cut off by a dimension L2, and the thread is formed The second male screw portion member is screwed together with the male locking screw and the female locking screw. and assembling the screws. Formula (3) L2=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, and according to this manufacturing method, This makes it easier to manufacture screws that are less likely to loosen and 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 achieving this state includes the steps of: engaging the tool with the engagement portion; and rotating the screw in a direction to loosen the screw. do.

[0025] According to the method of the present invention (9), screws that are difficult to loosen can be safely put into an untightened state. . [Effects 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 can be provided. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a perspective view of a screw according to a first embodiment of the present invention. [Figure 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. [Figure 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. [Figure 5] FIG. 10 is a cross-sectional view of a sixth embodiment of the screw of the present invention. [Figure 6] FIG. 10 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 the production method of the present invention (8). [Figure 10] FIG. 10 is a schematic diagram showing one method for safely untightening the screw of the present invention. [Figure 11] FIG. 10 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 when the head of the screw described in Patent Document 1 is twisted in the direction of loosening. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, embodiments 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 screw according to a first embodiment 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)). The connecting rod 13 is attached by a head 14 and a stop pin 15. It is bonded. A locking portion 17 is formed at the tip of the first male thread portion 11. A wrench or the like is attached to this locking portion 17. When the tool is attached and turned in the loosening direction, the screw 10 is safely put into an untightened state. The locking portion 17 has a hexagonal hole, but it can be fitted with a Phillips groove, a flathead groove, or a Torx (commercially available) screw. Mark) 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. are.

[0031] FIG. 2(B) is a cross-sectional view of the second embodiment, in which the screw 20 has a head 24 and a connecting rod 23. and a second male screw portion 22 having a thread 22a formed therein, and a recess 26 formed therein. The connecting rod 23 and the first male screw portion 21 are fastened together. The first male threaded portion 21 is connected to the first male threaded 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 untightened state. do.

[0032] FIG. 2(C) is a cross-sectional view of the third embodiment, in which the screw 30 has a head 34 and threads 32. a is engraved on the second male screw portion 32, and a second recess 36b is formed on the second male screw portion 32. The first male screw portion 31 having the first recess 36a formed therein and the second recess 36b The first male thread portion 31 and the second male thread portion 32 are inserted into the screw hole 31 by two locking pins 35. The connecting rod 33 is connected to the first male screw portion 31. The locking portion 37 is When a tool such as a wrench is attached to the locking portion 17 and 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, and the screw 40 is the same as that shown in FIG. ) screw, the difference is that the base end of the connecting rod 43 also has a locking portion. 3(A) is obtained by adding 30 to the symbol in FIG. 2(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 untightened state, which makes it possible to remove the screw. Improved bowel movements.

[0034] FIG. 3(B) is a cross-sectional view of a fifth embodiment of the screw of the present invention, and the screw 50 is the same as that shown in FIG. ) screw, the difference is that the base end of the connecting rod 53 also has a second engaging screw. 2(A) is added to the reference numeral 20, the reference numeral 3(B) is added to the reference numeral 3(C) in FIG. The symbols match, 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 loosening direction. By turning the screw 50, the screw 50 can be safely put into an untightened state, which makes it possible to remove the screw. Improved bowel movements.

[0035] 4(A) to 4(C) are schematic diagrams showing the mechanism of the present invention. 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 first male thread portion 11 and a second male thread portion 12, and the threads 11a of the first male thread portion 11 and the second male thread portion 12 are threaded together. and 12a, torque T1 is applied to the head 14 to eliminate the phase difference. The torque T1 causes the connecting rod 13 to twist as shown by the dotted and thin lines in the figure. .

[0036] FIG. 4(B) shows the state in which the second male screw portion 12 is screwed into the female screw 1a of the plate 1, and the head 14 is then removed. The torque T2 is applied in the direction of loosening. The torque t2 is applied due to the untwisting torque t1 of the rod 13 and the torque T2. The base end of the rod 13 is subjected to a torque due to the untwisting torque t1 and torque T2 of the connecting rod 13. When t1 and t2 are equal, the torque applied to the first male thread portion 11 is The first male screw portion 11 can finally start to move at this point. At that time, a torque of t1 + t2 = 2t1 is applied to the base end of 13, and 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 breaks.

[0037] FIG. 4(C) shows a state in which a wrench or the like is applied to the locking portion 17 at the tip end of the first male thread portion 11 and torque is applied. This shows the state where T3 is applied and the screw 10 is loosened. As in Figure 4(B), the connecting rod The torque of 13 acts on t1 and t3 in the opposite direction, and on the base end side of the connecting rod 13, t1 and t3 When t1 and t3 are equal, the torque on the tip of the connecting rod 13 is The torque on the base end side of the connecting rod 13 becomes zero, and the torque on the base end side of the connecting rod 13 becomes 2t1. This situation is shown in FIG. 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 a large mechanism, the displacement of the first male screw portion 11 on the drive side is greater than that of the first male screw portion 11 on the passive side. The displacement of the second male screw portion 12 does not increase. As a result, when the screw 10 is loosened using the locking portion 17, the connecting rod 1 Since 3 does not stretch, screw 10 can be safely removed.

[0038] FIG. 5 is a cross-sectional view of the screw of the sixth embodiment of the present invention, which is the same as the screw of 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 The screw 60 has a head 64, a recess 66 formed therein, and a thread 62a formed therein. a second externally threaded portion 62 and a first externally 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 provided. The first male screw portion 61 can be driven by using either of the first and second locking portions 67a and 67b. Therefore, the connecting rod 63 does not extend and the screw 60 can be safely put into an untightened state. This can be done.

[0039] FIG. 6 is a cross-sectional view of the screw of the sixth embodiment of the present invention, which is the same as the screw of the fifth embodiment shown in FIG. In place of the locking pin 55, a locking male screw 75a and a locking female 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 on which the threads 71a are formed are provided. A locking portion 77 is provided on the tip side of the threaded portion 71, and by using this locking portion 77, 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 made into.

[0040] 7A and 7B are schematic diagrams showing a method for manufacturing the screw 60 shown in FIG. 5. As shown in FIG. 7A, The second male thread 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 thread portion material 61M includes a first locking portion 67a, a locking male thread 65a, and a connecting rod 63. is formed but has not yet been threaded. 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 threads 61a and 62a are cut. The spacer 68 is still Since the threads 61a and 62a are interposed, there is no phase difference between them. As shown in (C), when the spacer 68 is removed and the screw thread 61a is assembled, the screw thread 62a A phase difference of α° occurs between the two, and the screw 60 is completed.

[0042] 8A and 8B are schematic diagrams showing another method of manufacturing the screw 60 shown in FIG. The second male thread material 62M has a head 64, a locking female thread 65b, and a recess 66 formed therein. The screw is attached, but the threads are not yet formed. The first male thread portion material 61M includes a first locking portion 67a, a locking male thread 65a, and a connecting rod 63. is formed but has not yet been threaded. The second male thread material 62M has a surplus tip portion 62m formed at the tip. The axial length L1 of 2m is It is calculated by formula (2) L1 = 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 cut in the state shown in FIG. 8(A), it will become 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] 9A and 9B are schematic diagrams showing another method of manufacturing the screw 70 shown in FIG. The second male thread material 72M has a head 74, a connecting rod 73, and a male locking thread 75b. The screw is attached but not yet threaded. The first male thread material 71M has a locking portion 77, a female locking thread 75b, and a recess 76 formed therein. The screw is attached, but the threads are not yet formed. The first male thread material 71M has a surplus tip portion 71m formed at the base end. The axial length L2 of 1m is It is calculated by the formula (3) L2 = 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 cut in the state shown in FIG. 9(A), it will become FIG. 9(B). 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 the thread 71a and the thread 72a, and the screw 70 is completed.

[0046] FIG. 10 is a schematic diagram showing one method for safely untightening the screw of the present invention. 0 includes a head 84, a recess 86, a second externally threaded portion 82 having a thread 82a, a connecting rod 83, and The first male screw portion 81 has a first male screw portion 81a and a second male screw portion 82. The stop pin 85 is inserted into the through hole 88b and has its 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 object, The first male screw portion 81 and the second male screw portion 82 can be separated from each other. A method of inserting a rod-shaped push pin 89a into the through hole 88a from above in the axial direction and hammering it. As a result, the stop pin 85 is removed to the left, and the first male thread portion 81 and the second male thread portion 82 are separated. 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 stop pin 85 comes out 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 for safely untightening the screw of the present invention. 0 includes a head 94, a recess 96, a second externally threaded portion 92 having a thread 92a, a connecting rod 93, and The first male screw portion 91 has a first male screw portion 91a and a second male screw portion 92. are connected by a C-ring 97. The C-ring 97 fits into a connecting recess 98. The head 94 and the connecting rod 93 are connected together. In order to safely release the screw 90 after it has been fastened to the object, The first male screw portion 91 and the second male screw portion 92 are simply separated from each other. When the dedicated tool is inserted and the C-ring 97 is narrowed inward, it will come 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 screws 11, 21, 31, 41, 51, 61, 71, 81, 91 First male thread 11a, 21a, 31a, 41a, 51a, 61a, 71a, 81a, 91a threads (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 locking screw 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, First male thread material 62M, Second male thread material 62m excess tip 68 spacer 72M Second male thread material 72m excess tip 88a, 88b through hole 89a, 89b push pins 97 C-ring 98 Connection recess 99 holes

Claims

1. a first male thread portion on the tip side; The thread is arranged coaxially with the axis of the first male screw portion and has the same shape as the thread of the first male screw portion. and a second male threaded portion having a thread of the same pitch and a recess formed therein; The first male threaded portion has a protruding portion protruding from an end surface of the second male threaded portion and inserted into the recess. A connecting rod is formed, the second male threaded portion and the connecting rod are connected by a joining 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 turning the portion.

2. a first male threaded portion on the tip side, the first male threaded portion having a recess formed therein; The thread is arranged coaxially with the axis of the first male screw portion and has the same shape as the thread of the first male screw portion. and a second male thread portion having threads of the same pitch; The second male screw portion has a protruding portion protruding from an end surface of the first male screw portion and 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 of the first male threaded portion to rotate the first male threaded portion. A screw provided with a part.

3. a first male thread portion on the tip side; The thread is arranged coaxially with the axis of the first male screw portion and has the same shape as the thread of the first male screw portion. and a second male thread portion having threads of the same pitch; a connecting rod that connects the first male threaded portion and the second male threaded 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 second male threaded portion has a first recess into which the connecting rod is inserted. 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 connecting means, and the first male thread portion and the second male thread portion are The portion is a screw that is shifted in phase by a predetermined angle around the axis, The first male screw is attached to the tip end of the first male screw portion and / or the base end of the connecting rod. A screw having an engaging portion that engages with a tool for turning the 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 screw 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 threadedly engaged 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 threadedly engaged with the female locking thread.

6. preparing a member for a first male thread portion on which the locking male thread is formed; preparing a member for a second male thread portion in which the female locking thread and the recess are formed; 、 The first member for male thread portion and the second member for male thread portion are interposed between their opposing surfaces, 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 in between. a step of assembling the locking male screw and the locking female screw to prepare a screw member; and, The threads on the outer periphery of the screw member are connected to the first male thread portion member and the second male thread portion member. forming a material over the material; The male locking screw and the female locking screw are unscrewed, and the spacer is removed. Steps and The first male threaded member on which the threads are formed and the second male threaded member on which the threads are formed The threaded portion member is assembled by screwing together the male locking screw and the female locking screw. 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. preparing a member for a first male thread portion on which the locking male thread is formed; The female thread for locking and the recess are formed, and the tip side has a dimension calculated by the following formula (2). preparing a member for a second male thread portion that is longer than a predetermined dimension by a measure L; The first male screw portion member and the second male screw 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 connected to the first male thread portion member and the second male thread portion member. forming a material over the material; The tip side of the second male thread portion member is １ and removing only the The first male screw portion member on which the threads are formed, and the tip side of the first male screw portion member on which the threads are formed 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 5. The method for manufacturing a screw according to claim 4, further comprising the step of assembling the female thread by screwing the female thread together. Equation (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 thread are formed, and the dimension L is calculated by the following formula (3). 2 Only place preparing a member for a first male thread portion, the member having a base end side longer than a predetermined dimension; preparing a member for a second male thread portion on which the locking male thread is formed; The first male screw portion member and the second male screw 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 connected to the first male thread portion member and the second male thread portion member. forming a material 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 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 threads are formed is connected to the locking male screw and the locking 6. The method for manufacturing a screw according to claim 5, further comprising the step of assembling the female thread by screwing the female thread together. Equation (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

9. The screw according to any one of claims 1 to 5 that has been fastened to a fastened object is brought 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 do it.

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