TW201604425A - Loosening protection bolt - Google Patents

Abstract

The present invention provides a loosening protection bolt, which comprises: a bolt and a push piece; a passage which is formed in a threaded shank of the bolt; at least one receiving space formed in an external circumferential surface of the threaded shank and in communication with the passage; and at least one abutting piece received in the receiving space in a movable manner, the abutting piece comprising at least one abutting section extending into the passage. The push piece is mounted in the passage of the bolt and can push the abutting piece to move towards the outer circumferential surface of the bolt. With the abutting piece abutting tightly against a corresponding screw fastener, the bolt of this invention allows for improve the fixation of the bolt to prevent the bolt from loosening.

Description

Avoid loose bolts

The invention relates to a threaded element and, in particular, to a bolt that prevents loosening.

The bolt is typically threaded into the nut to form a threaded assembly for securing the item to be secured. When the screw assembly is used or there are quite a lot of equipment, when the use of the screw assembly is subjected to variable load or frequent vibration, the bolt and the nut are often loosened under unpredictable conditions, causing loss and damage. Especially for equipment with high safety requirements, such as vehicles or bridges, power plants, etc., the screw assembly is not allowed to loosen.

In order to prevent the bolts and nuts from being loosened, the inventors have filed a patent application No. 102,121, 375, which, as shown in the first figure, is provided with more than one elastic member 10 between a bolt 12 and a nut 14. The elastic contact force between the bolt and the nut is prevented to prevent the bolt 12 and the nut 14 from loosening. However, the elastic energy of the elastic member 10 is a constant value. In the above-mentioned structure, the bolt 12 is only held by the constant elastic energy of the elastic member 10 to avoid loosening, in other words, the anti-loose method relies solely on the elasticity. The elastic anti-loose effect of the object is still not ideal.

Furthermore, the bolts required for different equipment have different degrees of looseness. The conventional structure shown in the first figure cannot change the anti-loosening effect between the bolt and the nut in response to the screwing conditions of different occasions. The inventor is in the spirit of excellence, and continues to The research and development techniques have been improved to develop the present invention.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a bolt that avoids loosening, which is an active anti-loose means to prevent loosening of the bolt.

Another object of the present invention is to provide a bolt that avoids loosening, and can adjust the anti-loose effect of the bolt to accommodate various fixtures and different screwing conditions.

The bolt provided by the present invention comprises: a bolt having a head and a screw; a passage disposed in the screw; at least one receiving space disposed on a peripheral surface of the screw of the bolt, and the passage Connected; at least one abutting member is disposed in the accommodating space and is displaceable in a radial direction of the screw; the abutting member has an abutting portion extending into the passage; and a holding member is disposed at the passage When the top member is displaced in the passage, the abutting portion of the abutting member can be pushed to move the abutting member to the outer circumferential surface of the screw.

Thereby, the bolt has an active anti-slipping structure. When the bolt is screwed with the opposite screw, the abutting member is pushed by the holding member to urge the abutting member to press the opposing screw. To make the bolt and the relative screw joints have a positioning effect to prevent loosening. Moreover, the present invention can adjust the pressing force of the abutting member against the corresponding screw member to meet various screwing conditions.

20, 20’, 20”, 20’” ‧‧‧ bolts

21‧‧‧ head

22‧‧‧ screw

24‧‧‧ channel

241‧‧‧ thread

25‧‧‧Open end

26‧‧‧ accommodating space

28‧‧‧Connected holes

30‧‧‧Agreement

32‧‧‧ Body

321‧‧‧ protruding parts

34‧‧‧Apartment

36‧‧‧Departure Department

40‧‧‧Top holding parts

42‧‧‧Touching Department

50, 55‧‧‧ nuts

52, 56‧‧‧ screw holes

58‧‧‧Top column

60‧‧‧ linkages

In order to enable your review board to further understand the purpose of the present invention, The eight preferred embodiments of the present invention are described in detail below with reference to the drawings. The first figure is a cross-sectional view of a bolt and a nut.

The second drawing is a perspective partial cross-sectional view of the bolt of the first preferred embodiment of the present invention, and shows that the bolt is screwed to a nut.

The third figure is a cross-sectional view of a bolt of a first preferred embodiment of the present invention.

The fourth figure is a cross-sectional view of the bolt of the first preferred embodiment of the present invention after screwing.

The fifth drawing is a cross-sectional view of the bolt of the first preferred embodiment of the present invention which is screwed and abutted.

Figure 6 is a cross-sectional view showing a bolt of a second preferred embodiment of the present invention.

Figure 7 is a cross-sectional view of the bolt of the second preferred embodiment of the present invention after screwing.

Figure 8 is a cross-sectional view showing the bolt of the second preferred embodiment of the present invention after being screwed and abutted.

Figure 9 is a cross-sectional view showing a bolt of a third preferred embodiment of the present invention.

Figure 11 is a cross-sectional view showing a bolt of a fourth preferred embodiment of the present invention.

Figure 11 is a cross-sectional view showing a bolt of a fifth preferred embodiment of the present invention.

Figure 12 shows the state of use of the eleventh figure. Figure 13 is a cross-sectional view showing a bolt of a sixth preferred embodiment of the present invention.

Figure 14 is a cross-sectional view showing a bolt of a seventh preferred embodiment of the present invention.

The fifteenth figure is a cross-sectional view taken along line 15-15 of Figure 14.

Figure 16 is another preferred embodiment of the abutment of the present invention.

Figure 17 is a cross-sectional view showing a bolt of an eighth preferred embodiment of the present invention.

Figure 18 is a cross-sectional view showing a bolt of a ninth preferred embodiment of the present invention. The bolt of the present embodiment is used in conjunction with a nut.

Figure 19 is a cross-sectional view showing a bolt of a tenth preferred embodiment of the present invention, and showing a nut engaged with the bolt.

Referring to the second and third figures, the bolt for avoiding loosening according to the first preferred embodiment of the present invention comprises: a bolt 20 having a head 21 and a screw 22, the top end of the screw 22 being connected to the bolt The bottom surface of the head 21 has a thread on its outer peripheral surface.

a passage 24 is disposed in a straight line and is disposed inside the bolt and located between the two ends of the bolt. The passage 24 has at least one open end located on the bottom surface of the screw 22 or the top surface of the head 21, such as the tenth Seven maps. In this embodiment, the passage 24 is disposed in the screw along the axial direction of the screw 22, and the open end 25 is located on the bottom surface of the screw. The passage 24 is a hole in the embodiment, and the inner peripheral surface is provided with a thread. 241.

At least one accommodating space 26 is provided on the outer circumferential surface of the screw 22 of the bolt 20. In this embodiment, an accommodating space 26 is disposed on the screw, and the accommodating space 26 has a groove shape and has a suitable length, such as, but not limited to, a length not less than one half of the length of the screw 22. . The at least one communication hole 28 is disposed on the inner wall of the accommodating space 26 and communicates with the accommodating space 26 and the channel 24 .

At least one abutting member 30, the embodiment has an abutting member 30, which is made of a metal strip or a metal sheet body, and has a body portion 32 and an abutting portion 34. The body portion 32 is bent in a U shape. The configuration is flexible and has a certain length; the abutting portion 34 is provided at one end of the body 32. The abutting member 30 is mounted on the bolt 20 , and the body portion 32 is received in the accommodating space 26 . The abutting portion 34 extends through the communication hole 28 and extends into the passage 24 . The abutting member 30 is slidable in the radial direction of the bolt 20 in the accommodating space 26 . The radial direction of the present invention refers to the inside of the bolt In the direction between the outer peripheral surface of the screw, the radial direction is not limited to the direction of the axial direction of the vertical bolt. The length direction of the body portion 32 is located in the longitudinal direction of the bolt 20, and the body portion has a compressible elasticity in the radial direction of the screw 22.

A top member 40 is provided with a tapered portion 42. The top member 40 is disposed in the passage 24 of the bolt 20 and is displaceable within the passage. The holding member 40 of the embodiment is a screwing member (small screw), and the outer peripheral surface thereof is provided with a thread; the touch portion 42 is conical, and is located at one end (inner end) of the holding member 40, and the holding member The passage 24 is screwed to the bolt, and when it is rotated, it can be displaced within the passage 24. The touch portion 42 corresponds to the abutting portion 34 of the abutting member 30. The touch portion 42 and the abutting portion 34 may be in contact with each other in a curved surface, a spherical surface, or a sloped surface in addition to the tapered surface.

In use, the bolt 20 is screwed to a screw hole provided in a screwing position (not shown) or screwed to a nut 50, as shown in the second and fourth figures, whereby the object 55 is fixed. For example, in the case of the bolts and the nuts of the drawings, the holding member 40 does not abut the abutting member 30 before the bolts 20 are used. Therefore, the body portion 32 of the abutting member 30 is located in the accommodating space 26 . The bolts and nuts can be screwed smoothly without being obstructed by the abutting member 30. The user bolts the bolt to the nut and tightens the bolt 20 to the required tightness to complete the screwing operation of the bolt and the nut. Then, the holding member 40 is rotated to move in the direction of the top end of the channel 24, that is, the holding member is moved into the bolt to make the touch portion 42 abut against the abutting member 30. The portion 34 moves and touches the abutment portion. Since the touch portion 42 has a tapered shape and has a sloped surface, the contact portion 42 pushes the abutting portion 34 away from the passage 24 as the abutting member 30 continues to move toward the top cymbal, so that the abutting member 30 slides outward in the radial direction of the screw 22. The body portion 32 moves in the accommodating space 26 toward the outer peripheral surface of the screw 22, and presses the hole wall of the screw hole 52 of the nut 50. The elastic pressing force of the abutting member 30 is present in the bolt and the nut. Between the bolts and the nut, the screw lock effect will not be loose. The The elastic effect of the body 32 is to improve the anti-loosening effect between the bolt and the nut. The top member of the embodiment directly pushes the displacement of the abutting member.

The pressing force of the abutting member 30 to tighten the nut 50 (relatively, the pressing force also acts on the bolt) can be adjusted by the holding member 40, and the more the holding member 40 abuts the abutting member 30 The abutting portion 34, the body portion 32 is more outwardly convex, and the force of the tightening nut is added. Otherwise, when the pushing member 40 pushes against the abutting portion 34, the abutting member 30 is weak. The nut is tightened with a small force. Thus, the pressing force of the abutting member 30 can be changed in accordance with various types of objects to be fixed, and the utility of the bolt 20 can be increased.

When the bolt 20 and the nut 50 are to be loosened, the holding member 40 is rotated in the other direction to move in the releasing direction in the passage 24, that is, the holding member 40 is moved toward the opening end 25. The releasing portion 42 releases the pressing force on the abutting portion 34; the body portion 32 of the holding member 40 no longer tightens the nut 50 to loosen the bolt and the nut.

In the present invention, the supporting member 40 is forced against the active abutting structure of the abutting member 30 to increase the abutting action between the bolt and the nut, and reduce the loosening of the wire to ensure that it remains in the screwed state. And the use of the holding member 40 can adjust the tightness of the abutting member 30, change the tightness between the bolt and the nut, and can adapt to various different objects to be fixed, for example, in precision instruments and mechanical devices. An article having a high safety factor and a high vibration frequency, such as a bridge or a vehicle, can cause the holding member 40 to firmly press the abutting member 30, and strengthen the strength of the body portion 32 of the abutting member 30 to tighten the nut. Therefore, the bolt and the nut are not loosened to meet the screwing requirement; on the contrary, when the structure with low safety factor requirement and low vibration frequency is used, the holding member 40 can be pressed against the lower strength. Piece 30, so that the bolt and the nut will not loosen. Other preferred embodiments described below can achieve the same efficacy.

Please refer to the sixth to eighth figures, which are presented in the second preferred embodiment of the present invention. For the bolts 20, the same elements follow the same symbols. The structure of this embodiment is mostly the same as that of the first preferred embodiment, and the same points are not described herein. Wherein: the body portion 32 of the abutting member 30 is an elongated metal body; the abutting portion 34 is disposed at one end of the body portion 32. When the abutting portion 34 is pressed by the contact portion 42 of the holding member 40, the abutting member 30 is displaced outwardly in the accommodating space 26 along the radial direction of the bolt 20. The body portion 32 is slidable relative to the abutment portion 34, and therefore, the body portion is provided with elasticity in the radial direction of the screw 22. When the bolt 20 is screwed into the screw hole of the screwing portion or the nut 50, the top member 40 is moved in the top direction, and the touch portion 42 is pushed against the abutting portion 34 of the abutting member 30. The body portion 32 of the abutting member 30 is caused to slide outwardly, and the wall of the hole of the screw hole 52 of the nut 50 is elastically pressed. The abutting member has an elastic contact force between the bolt and the nut, so that the bolt 20 and the nut 50 maintain a tight screwing effect and are not loose. When the holding member 40 is loosened and displaced in the releasing direction, the pushing member 40 can be released from the abutting member 30.

Please refer to the ninth embodiment, which is a bolt 20 provided by the third preferred embodiment of the present invention, and its structure is the same as that of the foregoing embodiment. The at least one accommodating space 26 is disposed on the screw 22; the two communicating holes 28 are separated by a predetermined distance, and communicate with the accommodating space 26 and the channel 24.

The at least one abutting member 30 is received in the accommodating space 26, and the body portion 32 of the abutting member 30 is elongated and straight; and the two abutting portions 34 are disposed on the body portion 32. Preferably, it is disposed at the two ends of the body. The body has flexibility/elasticity between the two abutting portions.

The holding member 40 has two touch portions 42 disposed along the axial direction of the holding member 40. For example, but not limited to, one touch portion 42 is disposed at an inner end of the top member, and the other touch portion 42 is disposed. Located on the body of the top holding member. The two touch portions 42 respectively correspond to the two abutting portions 34 of the abutting member 30.

When the holding member 40 is moved into the bolt 20, the two-touch portion 42 respectively pushing the two abutting portions 34 to urge the abutting member 30 to the outer circumferential surface of the screw 22, so that the body portion 32 is elastically pressed against the screwing member (the screw hole of the screw portion to be screwed or the bolt is screwed) The nut) has the elastic pressing force of the abutting member between the bolt and the opposite screw member, and the screwing state is not loosened. When the top holding member is moved outside the bolt 20, the elastic pressing force applied between the bolt and the opposing screw member can be released.

The tenth embodiment is a fourth preferred embodiment of the bolt of the present invention. The bolt 20 of the present embodiment is substantially the same as the third preferred embodiment, and the same reference numerals are used. The difference is that the body portion 32 of the abutting member 30 is curved and has a plurality of protruding portions 321 , and the abutting members 30 are connected to the corresponding screwing members by the protruding portions 321 (nuts or screws) The screw hole of the part can increase the contact effect between the abutting member and the opposite screw. The manner of use and effects of the present embodiment are the same as those of the foregoing embodiments. .

Referring to FIG. 11 , a bolt according to a fifth preferred embodiment of the present invention, the bolt 20 ′ also has a head 21 and a screw 22 , and a passage 24 disposed in the screw and at least one accommodating space. 26; an abutting member 30 is disposed in the accommodating space 26; a holding member 40 is disposed in the passage 24, the passage is provided with a thread 241, and has an open end 25.

The accommodating space 26 is a through hole, one end of which communicates with the passage 24, and the other end communicates with the outer peripheral surface of the screw 22; the abutting member 30 is a metal pin body, and the inner end is an abutting portion 34, and the outer end is The end is an abutment 36. The abutting member 30 is mounted in the accommodating space 26 and slidable. The abutment portion 34 can extend into the passage 24.

In use, as shown in the twelfth figure, the bolt and the nut 50 are screwed together as an example, and the holding member 40 is moved in the top direction of the channel 24 (ie, moved into the bolt), and the touch portion 42 thereof is used. Applying pressure to the abutting portion 34 of the abutting member 30 to urge the The abutting member is displaced outwardly along the accommodating space 26, and the abutting portion 36 urges the hole wall of the screw hole 52 of the nut 50 so that the bolt and the nut are not loosened. When the bolt and the nut are to be loosened, the pressing member 40 is first released from the pressing member 40 to loosen the bolt.

Referring to the thirteenth embodiment, the bolt 20 is provided in the sixth preferred embodiment of the present invention. The difference between this embodiment and the fifth embodiment is that a plurality of accommodating spaces 26, such as three accommodating spaces, are spaced apart. The ground is provided from one end of the screw 22 to the other end. In the longitudinal direction of the bolt, the three accommodating spaces 26 are located at different heights. The three accommodating spaces 26 may be on the same plane, that is, the three accommodating spaces are located at the same angular position on the circumference of the screw.

A plurality of the abutting members 30, for example, the three abutting members, are respectively accommodated in the accommodating spaces 26.

The holding member 40 is an elongated body; the three-touch portion 42 is disposed at intervals on the holding member 40 and respectively corresponds to the abutting portion 34 of the three abutting members 30. Preferably, a touch portion 42 is disposed at the inner end of the top member 40, and the remaining touch portions are disposed at the body of the top member.

When the holding member 40 is moved in the top direction, the three-touch portion 42 respectively touches the abutting portion 34 of the three abutting members 30 to slide the abutting member outward, thereby forcing the relative screwing member to be pressed. Bolts and opposing screws will not loosen.

The fourteenth and fifteenth drawings are the bolts 20' of the seventh preferred embodiment of the present invention. The present embodiment has the same accommodating space 26 and the abutting member 30, in the same manner as the sixth embodiment. The spaces 26 are not in the same plane and are spaced apart on the circumference of the screw 22, preferably at equal intervals, so that the accommodating spaces are located at different angular positions on the screw. In addition, in the longitudinal direction of the bolt, the accommodating spaces 26 are respectively located at different heights.

It can be understood that the three accommodating spaces can also be disposed at the same height and arranged on the same circumference on the screw. In this case, the three abutting members 30 are located at the same height, and only one of the engaging portions 42 is required to simultaneously push the abutting portions 34 of the three abutting members.

The embodiment shown in the eleventh to fifteenth embodiments can use the abutting member 30' shown in FIG. 16 to make the abutting portion 36 into a tip shape, so that the abutting member oppresses the opposing screw member. The force can be more concentrated, increase the frictional resistance between the bolt and the opposite screw, and improve the anti-loosening effect of the bolt and the relative screw.

In the first to tenth embodiments and the seventeenth embodiment described below, a plurality of abutting members may be provided as shown in the eleventh to fifteenth embodiments.

The seventh embodiment of the present invention provides an eighth preferred embodiment of the present invention, wherein at least one accommodating space 26 is disposed on the screw 22; a communication hole 28 communicating with the passage 24 and the accommodating space 26. The top member 30 and the top member 40 are respectively disposed in the accommodation space 26 and the passage 24 of the screw.

In addition, a linkage member 60, for example, a bead body, is disposed in the communication hole 28 and is slidable in the communication hole, and the inner end of the linkage member 60 extends into the passage 24. The contact portion 42 of the holding member 40 is opposite to the inner end of the linking member 60. The inner end 322 of the body portion 32 of the abutting member 30 contacts the outer end of the linkage member 60. Preferably, the body portion 32 has elasticity.

The holding member 40 is moved in the direction of the abutting direction, and the engaging portion 42 can move the linking member 60 outwardly, and the linking member 60 pushes the abutting member 30 to the outer peripheral surface of the screw to force the body 32 of the abutting member Tightly opposite to the screw member, the anti-loose effect of the bolt and the opposite screw member is achieved. When the holding member 40 is moved in the releasing direction, the state in which the abutting member is pressed against the screw member can be released. The top member of the embodiment indirectly pushes the abutting member through the linking member.

Figure 18 is a snail provided in a ninth preferred embodiment of the present invention The plug 20'" has a head 21 and a screw 22, and the screw 22 is provided with a passage 24 and at least one accommodating space 26; two abutting members 30 are installed in the accommodating space 26; 40, installed in the channel 24 and displaceable along the channel, the holding member has two touch portions 42 corresponding to the abutting portions 34 of the two abutting members 30. The wall surface of the channel 24 and the top portion The outer peripheral surface of the holding member 40 is unthreaded; a nut 55 is screwed to the free end of the screw 22, the nut 55 has a blind hole-shaped screw hole 56; and a top post 58 is disposed at the screw hole 56. The closed end is against the outer end of the top member 40.

The bolt 20'" and the nut 55 are used in special occasions or equipment, for example, for automobiles. When the nut 55 is screwed into the bolt 20'", the top post 58 is to be displaced by the nut. The top member 40 is pushed into the channel 24 to move the top member in the top direction, and the two abutting members 30 are pushed out of the chamber 26, so that the body portion 32 of the abutting member 30 is pressed against the screw portion. The wall of the hole of the screw hole is such that the bolt does not come loose.

Figure 19 is a cross-sectional view of a bolt 20'" of a tenth preferred embodiment of the present invention, and uses the symbol of the ninth preferred embodiment. The difference between this embodiment and the ninth embodiment is that the top holding The outer end of the member 40 is located outside the passage 24 and contacts the wall surface of the closed end of the screw hole 56 of the nut 55. Thereby, when the nut 55 is screwed with the bolt 20'", the holding member is the same 40 is pushed into the passage 24, thereby causing the holding member 40 to push the two abutting members 30 out of the chamber 26.

The structure of the preferred embodiment of Figures 18 and 19 can be applied to any of the preferred embodiments described above.

The bolt provided by the invention utilizes an active anti-loose structure of the top holding member and the abutting member to generate a pressing force between the bolt and the opposite screwing member, thereby enhancing the positioning effect between the screwing structures and effectively preventing the screw. The connection structure is loose. Moreover, the present invention allows the pressing force between the bolt and the opposing screw to be changed to suit various different screwing conditions, so that the applicability is wide.

The above examples are merely illustrative of the invention and not to be limiting. The invention The bolts provided are the first structure of the same kind of articles, and the improvement of the existing bolts is improved, and it is progressive.

20‧‧‧ bolt

21‧‧‧ head

22‧‧‧ screw

24‧‧‧ channel

241‧‧‧ thread

25‧‧‧Open end

26‧‧‧ accommodating space

28‧‧‧Connected holes

30‧‧‧Agreement

32‧‧‧ Body

34‧‧‧Apartment

40‧‧‧Top holding parts

42‧‧‧Touching Department

Claims (14)

A bolt for avoiding looseness, comprising: a bolt having a head and a screw, the top end of the screw being connected to the head, and having an outer peripheral surface provided with a thread; a passage disposed in the screw and having The at least one open end is located at one end of the bolt; at least one accommodating space is disposed on the outer peripheral surface of the screw of the bolt and communicates with the passage; at least one abutting member is disposed in the accommodating space, and the screw is Radial displacement; and a holding member disposed in the passage and displaceable in the passage; the retaining member can directly or indirectly push the abutting member when the displacement member is displaced, and the abutting member is moved to the screw The outer peripheral surface moves. The bolt of claim 1, wherein: the abutting member has an abutting portion that extends into the passage; and the holding member pushes the abutting portion of the abutting member. The bolt of claim 2, wherein each of the accommodating spaces has a communication hole that communicates with the accommodating space and the channel; the abutting portion of the splicing member extends through the communication hole and extends into the channel Each of the holding members has at least one touch portion, and the pressing portion pushes the abutting portion of the abutting member with the touch portion, and the touch portion and the abutting portion are tapered, curved or The shape of the bevel is in contact. The bolt of claim 1 or 2 or 3, wherein: the abutting member further has a body; the abutting portion is coupled to the body, the body being located in the accommodating space. The bolt of claim 4, wherein the body of the abutting member has an elongated configuration with a longitudinal direction of the bolt. The bolt of claim 2, wherein: each of the accommodating spaces is a perforation, one end of which communicates with the passage, and the other end of which communicates with the outer peripheral surface of the screw; In the shape of a pin, the inner end is the abutting portion; each of the holding members has at least one touch portion, and the pressing portion pushes the abutting portion of the abutting member with the touch portion, the touch portion and the abutting portion The joints are in contact with each other in the form of a cone, a slope, a sphere or a curved surface. The bolt of claim 1 or 2 or 3 or 6, wherein: the screw has two or more accommodating spaces; and two or more damper members are respectively disposed in the accommodating spaces in. The bolt according to claim 7, wherein: in the longitudinal direction of the bolt, the accommodating spaces are at different heights; the ejector member has two or more touch portions, respectively corresponding to the splicing members Responsible department. The bolt of claim 7, wherein: in the longitudinal direction of the bolt, the accommodating spaces are at the same height and are arranged on the same circumference on the screw; the abutting portions of the dampers correspond to The same touch portion of the top member. The bolt according to claim 1, wherein: at least one communication hole is disposed in the screw to communicate with the accommodating space and the passage; and further includes: a linkage member disposed in the communication hole for being connected Sliding in the hole; one end of the linking member extends into the passage; when the holding member is displaced in the passage, the linking member is activated, and the linking member drives the holding member to move to the outer circumferential surface of the screw. A bolt according to claim 1 or 2 or 3 or 10, wherein: the abutting member has elasticity in a radial direction of the screw. The bolt of claim 10, wherein the holding member and the linking member are in contact with each other in the form of a tapered surface, a sloped surface, a curved surface or a spherical surface. A bolt according to claim 1 or 2 or 6 or 10, wherein: the passage is a threaded hole; and the holding member is a threaded screw member having a peripheral surface. The bolt of claim 1 or 10, further comprising: a nut having a blind hole-shaped screw hole; the nut is screwed to the free end of the screw; The end system is in contact with the nut; when the nut rotates on the bolt, the top member is displaced.