JP2022173514A - Reverse rotation prevention structure of screw fastening mechanism and inclusion member of screw fastening mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means which performs reverse rotation prevention of high screw fastening mechanism, that is, reliable locking of the screw fastening mechanism and, at the same time, makes a position engageable with the screw fastening mechanism displaceable with a simple structure.

SOLUTION: In a relative rotation prevention structure of a screw fastening mechanism for fixing a body to be fastened, which is assembled with respect to a plurality of fastening bodies arranged and formed with an interval, the screw fastening mechanism includes the fastening bodies and inclusion members included between the fastening bodies and the body to be fastened, the fastening bodies have male screw parts inserted to the body to be fastened, the inclusion members have a plurality of insertion parts which can insert the male screw parts and have insertion holes and connection parts which connect the insertion parts with each other. Therein, a rotation prevention mechanism which regulates mutual relative rotation is provided between the fastening bodies and the inclusion member and a relative position of the insertion holes with each other can be changed in accordance with an angular change of the connection parts.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse rotation preventing structure for preventing reverse rotation of a screw fastening mechanism and an intervening member of the screw fastening mechanism.

Conventionally, fastening bodies such as bolts and nuts are used to fasten objects to be fastened in various situations. For example, in the case of a screw fastening mechanism using a male screw and a female screw, in order to screw the female screw into the male screw region of the male screw, the male screw is inserted into a hole formed in the object to be fastened, and then the female screw is screwed into the male screw head. and the female screw to clamp the object to be fastened. In addition, a washer is inserted between the object to be fastened and the head of the male screw or between the object to be fastened and the female screw.

Some washers consist of an integral plate, through which a plurality of bolts can be inserted, and have recesses and projections fitted between each bolt (see, for example, Patent Document 1). Further, Patent Literature 1 describes a washer that slidably supports an inserted bolt so that the bolt insertion hole can be displaced according to the relative positions of the bolts. As such a washer, in addition to a washer having an elongated hole into which a bolt is fitted, a washer composed of a plurality of intervening bodies, in which each intervening body and the bolt are fitted together and the intervening bodies are separated from each other. A slidably mating washer is disclosed.

JP 2015-72056 A

With the washer described in Patent Document 1, when the hole into which the bolt is fitted is elongated, the fitting area between the bolt and the washer is reduced compared to when the bolt is fitted in a circular hole. However, there is a problem that the fit between the bolt and the washer is weakened. In addition, when the washer is composed of a plurality of intervening bodies, each intervening body is fixed to the object to be fastened with a bolt, and at this time, the intervening bodies are aligned so as to fit each other. There is a risk that, due to human error, the washer will not be assembled, that is, the intervening bodies will not fit together, and the intervening bodies will be fixed to the object to be fastened without knowing the correct way to assemble the interposed bodies and the procedure for configuring the washer. .

The present invention has been achieved by the present inventor's intensive research in view of the above-mentioned problems, and has a simple structure to prevent reverse rotation of a screw fastening mechanism, that is, to reliably prevent loosening of the screw fastening mechanism. It is also an object of the present invention to provide means for displacing the position where the screw fastening mechanism can be engaged.

The relative rotation prevention structure of the screw fastening mechanism of the present invention is a screw that is assembled to a plurality of fastening bodies arranged at intervals for fixing the fastening body to fix the fastening body. A structure for preventing relative rotation of a fastening mechanism, wherein the screw fastening mechanism comprises a fastening body and an intervening member interposed between the fastening body and the body to be fastened, and a male thread portion through which the fastening body is inserted into the body to be fastened. The intervening member has a plurality of insertion portions through which the male screw portion can be inserted, and has a plurality of insertion portions having insertion holes, and a connecting portion that connects the insertion portions. It is characterized by having a rotation preventing mechanism for restricting rotation, and capable of changing the relative positions of the insertion holes by changing the angle of the connecting portion.

Further, in the relative rotation prevention structure of the screw fastening mechanism of the present invention, the fastening body includes a female threaded body having a female threaded portion that can be screwed to the male threaded portion, and the intervening member is arranged between the female threaded body and the fastened body. The female threaded body has a female thread side rotation preventing portion that can prevent relative rotation in the tightened state with respect to the male thread portion, and the intervening member engages with the female thread side rotation preventing portion provided on the insertion portion to prevent the female thread body from rotating. and an intervening member-side rotation preventing portion capable of preventing relative rotation with respect to the male thread portion of the.

Further, the relative rotation preventing structure for a screw fastening mechanism of the present invention includes a male screw side rotation preventing portion that can prevent relative rotation with respect to an intervening member, in which the rotation preventing mechanism is provided in the male screw portion, and a rotation preventing portion that is provided in the insertion portion. and an intervening member side rotation prevention portion that can engage with the male thread side rotation prevention portion to prevent relative rotation of the male screw portion with respect to the fastened body.

Moreover, the relative rotation prevention structure of the screw fastening mechanism of the present invention is characterized in that the relative positions of the insertion holes are changed by elastically and/or plastically deforming the connecting portion.

Further, in the relative rotation preventing structure of the screw fastening mechanism of the present invention, the intervening member is composed of a plurality of partial bodies including the insertion portion, and the connecting portion has connecting means for rotatably connecting and connecting the partial bodies. characterized by

Further, the relative rotation prevention structure for a screw fastening mechanism of the present invention is characterized in that the intervening member-side anti-rotation portions are formed on the front and back surfaces of the intervening member arranged along the axis of the insertion hole.

Moreover, the relative rotation prevention structure of the screw fastening mechanism of this invention is characterized by having a female screw side rotation prevention part in the front and back surface where a female screw body is arrange|positioned along an axial center.

In addition, the intervening member of the screw fastening mechanism of the present invention is a screw fastening mechanism that is arranged between a plurality of fastening bodies arranged at intervals and a fastening target body and that fixes the fastening target body. An intervening member, which is capable of being inserted through the male threaded portion of the fastening body and has a plurality of insertion holes, and engages with the fastening body, which is formed on the front and rear surfaces of the insertion part along the axial center of the insertion hole. It is characterized by having a rotation preventing portion for restricting the rotation of the fastening body and a connecting portion for connecting the insertion portions, so that the relative positions of the insertion holes can be changed by changing the angle of the connecting portion.

Further, in the intervening member of the screw fastening mechanism of the present invention, the fastening body includes the head of the male screw body, and the head can be engaged with the rotation prevention part and has the male screw side rotation prevention part that restricts relative rotation. Characterized by

In addition, the intervening member of the screw fastening mechanism of the present invention is a female threaded body in which the fastening body can be screwed into the male threaded part, and the female threaded body can be engaged with the rotation prevention part to restrict relative rotation. characterized by having

Moreover, the intervening member of the screw fastening mechanism of the present invention is characterized in that the female screw body has female screw side rotation preventing portions on front and back surfaces along the axis.

Further, the intervening member of the screw fastening mechanism of the present invention is characterized in that the connecting portion is elastically and/or plastically deformed to change the relative positions of the insertion holes.

Further, the intervening member of the screw fastening mechanism of the present invention is composed of a plurality of partial bodies including the insertion portion, and the connecting portion has connecting means for rotatably connecting and connecting the partial bodies. characterized by

According to the present invention, with a simple structure, it is possible to prevent reverse rotation of the fastening body, that is, to reliably prevent loosening of the fastening body, and to displace the position where the fastening body can be engaged.

FIG. 4 is a partial cross-sectional view showing the anti-reverse rotation structure of the screw fastening mechanism according to the first embodiment; It is a figure which shows the external thread body of 1st embodiment. The interposition member of 1st embodiment is shown, (a) is a top view, (b) is a side view. The internal thread body of 1st embodiment is shown, (a) is a side view, (b) is sectional drawing. It is a figure which shows the displacement of the relative position of insertion parts by deformation|transformation of the intervening member of 1st embodiment. It is a figure which shows the other shape example of the unevenness|corrugation of an engagement groove part and an engagement protrusion part. FIG. 10 is a diagram showing another example of the direction in which the protrusions and recesses of the engagement groove and the engagement projection extend. FIG. 10 is a diagram showing another example of an intervening member; It is a figure which shows the interposition member of 2nd embodiment. The partial body for comprising the interposition member which concerns on 2nd embodiment is shown, (a) is a top view, (b) is sectional drawing. It is a figure which shows the displacement of the relative position of insertion parts by the intervening member which concerns on 2nd embodiment. It is a figure which shows the intervening member which formed the engagement groove part in both surfaces. It is a figure which shows the internal thread body which formed the engagement protrusion part on both surfaces. It is a figure which shows the screw fastening structure in case an intervening member and a male thread body engage. FIG. 10 is a diagram showing another example of a partial body forming an intervening member;

A reverse rotation prevention structure of the screw fastening mechanism 1 according to the first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view showing the reverse rotation prevention structure of the screw fastening mechanism 1 according to the first embodiment. The reverse rotation prevention structure of the screw fastening mechanism 1 of this embodiment includes a plurality of male screw bodies 10 arranged at intervals, an intervening member 20 as a washer having a plurality of insertion holes 24 formed therein, and a male screw body 10 and body 100, 110 to be fastened. The objects to be fastened 100 , 110 are fastened by a screw fastening body composed of the male threaded body 10 and the female threaded body 30 .

FIG. 2 is a diagram showing the male threaded body 10 of the first embodiment. The male threaded body 10 is a so-called bolt and has a head portion 12 and a shaft portion 14 . A fastening portion-side seat portion 12a is formed at a portion corresponding to the lower portion or base of the head portion 12. As shown in FIG. A cylindrical portion 14a and a male threaded portion 14b are formed on the shaft portion 14, and a male screw spiral groove is formed on the outer peripheral surface of the male threaded portion 14b. Of course, the cylindrical portion 14a is not essential.

FIG. 3 shows the intervening member 20 of the first embodiment, where (a) is a plan view and (b) is a side view. The interposed member 20 has a plurality of insertion portions 22 and connecting portions 28 that connect the insertion portions 22 to each other. Although two insertion portions 22 are provided here, the number of insertion portions 22 can be appropriately set, and it goes without saying that three or more insertion portions 22 may be provided. The insertion portion 22 has a substantially circular insertion hole 24 through which the shaft portion 14 can be inserted, and an engagement groove portion 26 (interposed member side rotation prevention portion) formed to surround the insertion hole 24 . The width (area of the surface) of the insertion portion 22 is set so that it can contact substantially the entire end face of the female threaded body 30 .

The engaging groove portion 26 is formed in a recessed shape with a substantially truncated cone-shaped cross-section having a tapered inner peripheral surface at one end face (upper end face shown in FIG. 3B) that contacts the female threaded body 30 . A plurality of unevennesses are formed along the circumferential direction on the tapered inner peripheral surface of the engaging groove portion 26 . The unevenness has a sawtooth shape, that is, a shape consisting of a vertical surface rising substantially perpendicular to the inner peripheral surface and an inclined surface (a surface connecting the vertical surface and the inner peripheral surface), and the direction in which the unevenness extends, That is, the direction in which the ridgeline extends is set along the radial direction of the insertion hole 24 . Accordingly, the unevenness of the inner peripheral surface of the engaging groove portion 26 extends radially from the axial center of the insertion hole 24 .

The shape of the connecting portion 28 is set so that it can be elastically and/or plastically deformed when an external force of a predetermined magnitude or more is applied. Here, the central portion of the intervening member 20 between the insertion portions 22 in a plan view is the connection portion 28, and the connection portion 28 has a constriction compared to the insertion portion 22 and has a shape that is easily deformed by an external force. . That is, the connecting portion 28 is a portion disposed between the insertion portions 22 and has a width perpendicular to the imaginary line connecting the axial centers of the two insertion holes 24 narrower than the width of the insertion portion 22 . set. As a result, the connecting portion 28 can be deformed along the width direction by application of an external force greater than or equal to a predetermined amount. Note that the connecting portion 28 may be deformable in the width direction and/or the axial direction. In particular, when deforming in the axial direction, it is preferable to set the thickness of the connecting portion 28 in the axial direction thinner than that of the insertion portion 22 .

In addition, the external force of a predetermined magnitude for bending the connecting portion 28 described above may be, for example, an external force that can be applied manually or an external force that can be applied using various tools. , the sizes of the bodies to be fastened 100 and 110, the size of the internal thread body 30, and the like.

FIG. 4 shows the internal thread body 30 of 1st embodiment, (a) is a side view, (b) is sectional drawing. The female threaded body 30 is a so-called hexagonal nut, and has a cylindrical portion 32. On the inner peripheral surface of the cylindrical portion 32, a female threaded portion 34 having a female threaded helical thread to be screwed with the male threaded helical groove of the male threaded portion 14b is formed. .

An engaging protrusion 36 (female screw side anti-rotation portion) that engages with the engaging groove 26 is formed on one axial end face of the female thread body 30 . The engaging protrusion 36 protrudes in the axial direction from one end face in a substantially truncated cone shape, and has a tapered outer peripheral surface formed with a plurality of irregularities along the circumferential direction. The unevenness has a sawtooth shape (see, for example, FIG. 6A), and the direction in which the unevenness extends, that is, the direction in which the ridgeline extends is set along the radial direction of the female screw body 30 . As a result, the unevenness of the tapered outer peripheral surface of the engaging projection 36 extends radially from the axis.

The objects to be fastened 100 and 110 have a plurality of through holes 100a and 110a, respectively. The through-holes 100 a and 110 a are formed at positions corresponding to each other between the objects to be fastened 100 and 110 , and communicate with each other when the screw fastening mechanism 1 fastens the objects 100 and 110 .

Here, the fastening of the fastened bodies 100 and 110 will be described. When fastening the objects 100 and 110 to be fastened by the screw fastening mechanism 1, the shaft portion 14 of the male threaded body 10 is inserted through the through holes 100a and 110a. At this time, it is assumed that the fastening portion side seat portion 12 a of the head portion 12 abuts on the fastening object 110 , and the fastening object 100 is arranged on the tip side of the shaft portion 14 .

An intervening member 20 and a female threaded body 30 are arranged on the side opposite to the head portion 12 of the male threaded body 10 with the fastened bodies 100 and 110 interposed therebetween. That is, the intervening member 20 is inserted through the shaft portion 14 inserted through the through holes 100a and 110a of the objects to be fastened 100 and 110 with the engaging groove portion 26 facing outward (opposite side of the object to be fastened 100). Further, the female threaded body 30 is screwed into the male threaded portion 14b from the outside of the intervening member 20. As shown in FIG. At this time, the engagement protrusion 36 of the female threaded body 30 is opposed to the engagement groove 26 .

Thereby, between the intervening member 20 and the female threaded body 30, a first anti-rotation mechanism for restricting the relative rotation of the female threaded body 30 with respect to the intervening member 20 is constructed. A second anti-rotation mechanism for restricting the relative rotation of the intervening member 20 with respect to the fastened bodies 100 and 110 is configured between the intervening member 20 and the plurality of female screw bodies 30 .

The first anti-rotation mechanism is configured by engagement between the engagement groove portion 26 of the intervening member 20 and the engagement projection portion 36 of the internal thread body 30 . Specifically, when the female threaded body 30 rotates in the tightening direction and moves toward the intervening member 20 , the engaging protrusion 36 enters the engaging groove 26 . Furthermore, when the female threaded body 30 rotates in the tightening direction, the unevenness of the engaging protrusion 36 and the unevenness of the engaging groove 26 engage with each other.

Here, when the female threaded body 30 rotates in the tightening direction, the serrated surfaces of both of them contact each other with their slanted surfaces (or the surface on the side with the gentler inclination), and the distance between the two is narrowed in the axial direction to allow relative sliding. set to allow. On the other hand, when the female threaded body 30 rotates in the loosening direction, the vertical surfaces (or the surfaces on the side with the stronger inclination) are set to abut against each other to prevent relative movement therebetween.

Therefore, in the first anti-rotation mechanism, by tightening the female threaded body 30, the engagement between the engaging protrusion 36 and the engaging groove 26 is strengthened, and the strength against rotation of the female threaded body 30 in the loosening direction is improved. As a result, it acts as a reliable locking mechanism for the female screw body 30 .

The second anti-rotation mechanism is composed of an intervening member 20 and a plurality of male screw bodies 10 inserted through the intervening member 20 . Specifically, since the intervening member 20 is fixed at a plurality of locations by the plurality of male screw bodies 10, even if an external force capable of rotating the intervening member 20 is applied, the rotation of the intervening member 20 is restricted and the rotation of the intervening member 20 is prevented. function as a mechanism.

In the screw fastening mechanism 1 described above, the intervals between the through holes 100a (and the through holes 110a) of the fastened body 100 (and the fastened body 110) do not match due to various causes such as design errors. Even if there is no intervening member 20 , the relative positions of the insertion portions 22 can be displaced by deforming the interposed member 20 to fix them to the objects 100 and 110 to be fastened. Specifically, as shown in FIG. 5, when the connecting portion 28 of the intervening member 20 is bent, the angle of the connecting portion 28 changes to change the relative positions of the insertion holes 24 . As a result, the distance a between the insertion holes 24 can be shortened by increasing the angle change of the connecting portion 28 from the initial state shown in FIG. Even if the distance between 100a (and through-hole 110a) deviates from place to place, male threaded body 10 can be reliably inserted through intervening member 20 .

As described above, according to the screw fastening mechanism 1 according to the first embodiment, the intervening member 20 and the female threaded body 30 are engaged by the first anti-rotation mechanism, and the female threaded body 30 engages the male threaded body 10. Rotation in the loosening direction can be restricted. Further, the rotation of the intervening member 20 with respect to the objects to be fastened 100 and 110 is restricted by the male screw bodies 10 by the second anti-rotation mechanism. Therefore, even if vibration or the like occurs, it is possible to obtain a fastened state that does not loosen at all. Further, by bending the connecting portion 28 to change the angle, the relative position between the through holes 24 can be changed. The male threaded body 10 and the female threaded body 30 can be fastened together. In addition, since the inserting portion 22 of the intervening member 20 abuts substantially the entire end surface of the female threaded body 30, even if the relative positions of the inserting portions 22 are displaced, the interposed member 20 can be stably engaged with the female threaded body 30.

In addition, since the relative positions of the insertion portions 22 are changed by deforming the connection portion 28, the insertion portions 22 are always connected to each other. In contrast, the rotation prevention function of the intervening member 20 with respect to the objects to be fastened 100, 110 does not fail due to human error, and the rotation of the intervening member 20 with respect to the objects to be fastened 100, 110 can be reliably prevented. .

The engagement groove 26 and the engagement protrusion 36, which are the first anti-rotation mechanism, have been described as having a sawtooth shape (see FIG. 6(a)), but the present invention is not limited to this. For example, as shown in FIG. 6(b), it may be a mountain shape composed of inclined surfaces, or a waveform having curved ridges and troughs as shown in FIG. 6(c).

Further, although the direction in which the unevenness extends has been described as the radial direction, as shown in FIG. Concavities and convexities extending linearly in a direction inclined to change may be used.

The shape of the intervening member 20 is not particularly limited as long as the plurality of insertion portions 20 are connected by connecting portions 28. For example, as shown in FIG. , or a shape in which the insertion portion 20 having a substantially rectangular outer shape in a plan view as shown in FIG. 8B and corner portions of the rectangle are connected as connecting portions .

Next, a screw fastening mechanism 1 according to a second embodiment will be described. Here, the differences from the screw fastening mechanism 1 according to the first embodiment will be explained, and the same parts will be denoted by the same reference numerals, and the explanation thereof will be omitted. The screw fastening mechanism 1 of the second embodiment differs from the screw fastening mechanism 1 of the first embodiment in that an intervening member 50 is configured by connecting a plurality of partial bodies 52 and 54 .

9 is a diagram showing an intervening member of the second embodiment, FIG. 10 shows a partial body for constituting the intervening member according to the second embodiment, (a) is a plan view, (b) is a cross section It is a diagram. The intervening member 50 according to the second embodiment is configured by connecting the partial bodies 52 and 54 via the connecting portion 60 so as to be relatively rotatable. As shown in FIG. 10, each of the partial bodies 52 and 54 is formed with an insertion portion 22 . The partial body 52 also forms a part of the connecting portion 60 and has a connecting region 52a with a concave upper surface. A fitting protrusion 56 having a convex shape is formed in a substantially central portion of the connecting region 52a. On the other hand, the partial body 54 forms a part of the connecting portion 60 and has a connecting region 54a with a recessed lower surface. A fitting hole portion 58 into which the fitting projection 56 can be fitted is formed in substantially the central portion of the connecting region 54a.

The thickness of the connection regions 52 a and 54 a along the axial direction of the insertion hole 24 is set to approximately half the thickness of the insertion portion 22 . For this reason, the partial body 52 has a step 53 between the insertion portion 22 and the connecting region 52a on the upper surface in the orientation shown in FIG. 9(b). Similarly, the partial body 54 has a step 55 on its underside between the insertion portion 22 and the connecting region 54a. The step 53 is formed so as to extend substantially linearly in a plan view, as shown in FIG. 9(a). It should be noted that the step 55 is also formed so as to extend substantially linearly in plan view in the same manner as the step 53 . Further, the extending directions of the steps 53 and 55 are set so that when the interposed member 50 is formed, the steps 53 and 55 form a symmetrical shape with respect to the connecting portion 60 .

Further, as shown in FIG. 10(b), the fitting protrusion 56 is fitted into the fitting hole 58, and the upper surface of the connecting region 52a of the partial body 52 and the lower surface of the connecting region 54a of the partial body 54 are brought into contact. When the partial bodies 52 and 54 are arranged such that their upper surfaces are substantially flush with each other and their lower surfaces are substantially flush with each other, the intermediate members 50 are formed.

By fitting the fitting protrusion 56 into the fitting hole 58 and connecting the connecting regions 52a and 54a to each other, the connecting portion 60 is formed. Specifically, the fitting protrusion 56 is fitted into the fitting hole 58 so that the top surface of the coupling region 52a and the bottom surface of the coupling region 54a are in contact with each other. As a result, the partial body 52 can rotate relative to the partial body 54 around the connecting portion 60 (the fitting protrusion 56). The connecting portion 60 thus functions to displace the relative position between the insertion portions 22, ie between the partial bodies 52,54.

Here, FIG. 11 is a diagram showing displacement of the relative positions of the insertion portions 22 by the interposed member 50 according to the second embodiment. FIG. 11(a) shows a first state in which the distance between the partial bodies 52 and 54 is the longest. and the axial center of the fitting hole portion 58 is located.

11B and 11C show a state in which the distance between the partial bodies 52 and 54 is shorter than in the first state, and a state in which the partial body 52 is rotated with reference to the first state. FIG. 11(b) shows a state between the first state and a regulated state, which will be described later, and shows a second state in which the partial body 52 is rotated to an intermediate position within the rotatable range. FIG. 11(c) shows a regulated state in which the partial body 52 is rotated to the limit of the rotatable range (regulated position). Here, the restriction position is a position where the step 53 of the partial body 52 abuts against the side surface of the partial body 54 and a position where the step 55 of the partial body 54 abuts against the side surface of the partial body 52 . That is, since the partial body 52 (partial body 54) abuts on the step 55 (step 53), further rotation is restricted.

In this manner, the partial body 52 contacts the step 55 and the partial body 54 contacts the step 53, thereby forming a regulated state of the intervening member 50. When the regulated state is established, the distance between the insertion portions 22 is maximized. shortened. Therefore, in the intervening member 50, the relative positions of the insertion portions 22 are displaced so that the distance between the insertion portions 22 can be shortened in the order of the first state, the second state, and the restricted state.

As described above, according to the intervening member 50 according to the second embodiment, the partial bodies 52 and 54 are connected to each other so as to be relatively rotatable, and the partial bodies 52 and 54 are rotated relative to each other. Thus, the relative positions of the insertion portions 22 can be displaced.

Further, the partial bodies 52 and 54 are connected by fitting the fitting protrusion 56 into the fitting hole 58, and by rotating one of them, the intermediate member 50 can be in any one of the first state, the second state, and the restricted state. Since the insertion member 50 is formed, the insertion portion 22 can be aligned and arranged between the fastened body 100 and the female screw body 30 while the interposed member 50 is formed. That is, the intervening member 50 can be arranged between the body 100 to be fastened and the female threaded body 30 so that it cannot be separated into the partial bodies 52 and 54 . Therefore, it is possible to reliably prevent only the partial body from being disposed between the fastening body 100 and the female screw body 30 without forming the intervening member 50 due to human error or the like.

In the above-described second embodiment, the partial bodies 52 and 54 are connected by fitting the fitting projection 56 into the fitting hole portion 58, but the present invention is not limited to this. After fitting into the hole 58, the fitting projection 56 may be crimped to stop. Further, instead of the fitting protrusion 56 and the fitting hole portion 58, holes are provided in the connection region 52a of the partial body 52 and the connection region 54a of the partial body 54, respectively, and the holes are communicated with each other to insert and fit the pin. The bodies 52, 54 may be coupled for relative rotation.

In each of the embodiments described above, the case where the engaging groove portion 26 is formed only on one surface of the intervening member has been described as an example, but the engaging groove portion 26 may be formed on both surfaces. For example, in the intervening member 20 according to the first embodiment, as shown in FIG. 12, the engaging groove portions 26 are formed on the two surfaces of the insertion hole 24 arranged along the axial direction.

By using the intervening member 20 in which the engaging grooves 26 are formed on two sides arranged along the axial direction of the insertion hole 24 in this way, it is possible to prevent the intervening member 20 from being arranged in the wrong direction. I can. That is, in the screw fastening mechanism 1 according to the first embodiment, there is a possibility that the engaging groove portion 26 of the intervening member 20 is arranged in a direction opposite to the direction shown in FIG. . In that case, the engagement protrusion 36 of the female threaded body 30 cannot engage with the engagement groove 26, so the first anti-rotation mechanism is not formed. On the other hand, if the engaging grooves 26 are formed on the two surfaces of the intervening member 20 arranged along the axial direction, the first anti-rotation mechanism can be reliably formed regardless of the orientation of the intervening member 20. can do.

Similarly, in the female threaded body 30, as shown in FIG. Since the engaging protrusion 36 is reliably engaged with the engaging groove 26 in either direction, the first anti-rotation mechanism can be formed.

Moreover, although the screw fastening structure 1 mentioned above was demonstrated as what the intervening member 20 and the internal thread body 30 engage, of course, you may engage with the external thread body 10. FIG. For example, the object to be fastened 100 shown in FIG. 14 is formed with a plurality of female threaded holes 100a that are screwed into the male threaded portion. , the intervening member 20 is disposed between the male threaded body 10 and the body 110 to be fastened. In such a case, an engaging projection 13 corresponding to the engaging projection 36 is formed on the fastening portion side seat portion 12a of the head 12 of the male threaded body 10, and interposed with the engaging projection 13b of the male threaded body 10. The member 20 is engaged with the engaging groove portion 26 .

In addition, the case where the intervening member 20 has the engaging groove portion 26 and the female threaded body 30 has the engaging protruding portion 36 has been described as an example, but it is not limited to this, and the intervening member 20 has the engaging protruding portion. and the female screw body 30 may have an engagement groove.

In addition, in the intervening member 50 according to the above-described second embodiment, the steps 53 and 55 of the partial bodies 52 and 54 are extended substantially linearly in a plan view. It may have a shape that bends and stretches. With such a bent shape, the relative rotation range between the partial bodies 52 and 54 can be narrowed or widened as compared with the case where the partial bodies 52 and 54 are straight.

For example, when the step 53 in the portion 52 is bent so as to reduce the area of the connecting region 52a, that is, as shown in FIG. When the step 53 is bent at the central portion so as to incline toward the distal end of the step 53, the relative rotatable range between the partial bodies 52 and 54 is larger than that in the above-described second embodiment. down. Further, when the step 53 is bent to expand the area of the connecting region 52a, that is, as shown in FIG. Thus, when the step 53 is bent at the central portion, the relative rotatable range between the partial bodies 52 and 54 is expanded as compared with the second embodiment described above.

Reference Signs List 1 screw fastening mechanism 10 male screw body 12 head 12a fastening portion side seat portion 14 shaft portion 14a cylindrical portion 14b male thread portion 20, 50 intervening member 22 insertion portion , 24... Insertion hole, 26... Engagement groove, 28, 60... Connection part, 30... Female screw body, 32... Cylindrical part, 34... Female screw part, 36... Engagement protrusion, 52, 54... Partial body, 52a, 54a... Connection area, 56... Insertion projection, 58... Insertion hole portion, 100, 110... Objects to be fastened, 100a, 110a... Through hole.

Claims (13)

A structure for preventing relative rotation of a screw fastening mechanism that is assembled to a plurality of fastening bodies arranged at intervals for fixing the fastening bodies to fix the fastening bodies,
The screw fastening mechanism includes the fastening body and an intervening member interposed between the fastening body and the fastened body,
The fastening body has a male thread portion that is inserted through the fastening body,
The intervening member has a plurality of insertion portions through which the male screw portion can be inserted and has insertion holes, and a connecting portion that connects the insertion portions,
A rotation prevention mechanism for restricting relative rotation between the fastening body and the intervening member is provided,
A relative rotation preventing structure for a screw fastening mechanism, wherein the connecting portion is deformable along a plane perpendicular to the axial center of the through hole so as to change the relative position between the through holes. The fastening body includes a female threaded body having a female threaded portion that can be screwed to the male threaded portion,
The intervening member is arranged between the female threaded body and the body to be fastened,
The female threaded body has a female thread side anti-rotation portion that can prevent relative rotation in the fastening state with respect to the male threaded portion,
The intervening member has an intervening member side anti-rotation portion that engages with the female thread side anti-rotation portion provided on the insertion portion to prevent relative rotation of the female thread body with respect to the male thread portion. The structure for preventing relative rotation of a screw fastening mechanism according to claim 1. The anti-rotation mechanism is
a male-screw-side rotation preventing portion provided on the male-screw portion capable of preventing relative rotation with respect to the intervening member;
2. An intervening member side rotation preventing portion provided in said insertion portion, which is engaged with said male thread side rotation preventing portion to prevent relative rotation of said male screw portion with respect to said object to be fastened. Relative rotation prevention structure of the screw fastening mechanism according to 1. The connecting portion has a width narrower than the width of the insertion portion, and elastically and/or plastically deforming the connecting portion changes the relative positions of the insertion holes. A reverse rotation prevention structure for a screw fastening mechanism according to any one of claims 1 to 3. The intervening member is composed of a plurality of partial bodies including the insertion portion,
4. The reverse rotation preventing structure for a screw fastening mechanism according to claim 1, wherein said connecting portion has connecting means for rotatably connecting and connecting said partial bodies. 6. The screw fastening mechanism according to any one of claims 1 to 5, wherein the intervening member-side rotation preventing portion is formed on front and rear surfaces of the intervening member arranged along the axial center of the insertion hole. Reverse rotation prevention structure. 4. The structure for preventing relative rotation of a screw fastening mechanism according to claim 3, wherein the female screw body has the female screw side rotation preventing portion on front and back surfaces arranged along the axis. An intervening member of a screw fastening mechanism that is arranged between a plurality of fastening bodies arranged at intervals and a fastening body and that fixes the fastening body,
a plurality of insertion portions having insertion holes through which the male screw portion of the fastening body can be inserted;
a rotation prevention portion formed on the front and back surfaces of the insertion portion along the axis of the insertion hole, capable of engaging with the fastening body and restricting rotation of the fastening body;
a connection portion that connects the insertion portions to each other;
An intervening member of a screw fastening mechanism, wherein the connecting portion is deformable along a plane perpendicular to the axis of the through holes so as to change the relative position between the through holes. The fastening body includes a head of a male screw body,
9. The intervening member of the screw fastening mechanism according to claim 8, wherein the head has a male screw side anti-rotation portion that can be engaged with the anti-rotation portion and restricts relative rotation. The fastening body is a female threaded body that can be screwed to the male threaded portion,
9. The intervening member of the screw fastening mechanism according to claim 8, wherein the female screw body has a female screw side anti-rotation portion that can be engaged with the anti-rotation portion and restricts relative rotation. 11. The intervening member of the screw fastening mechanism according to claim 10, wherein the female screw body has the female screw side anti-rotation portion on front and back surfaces along the axis. The connecting portion has a width narrower than the width of the insertion portion, and elastically and/or plastically deforming the connecting portion changes the relative positions of the insertion holes. 12. The intervening member of the screw fastening part according to any one of claims 8 to 11. The intervening member is composed of a plurality of partial bodies including the insertion portion,
12. The intervening member of the screw fastening mechanism according to claim 8, wherein the connecting portion has connecting means for rotatably connecting and connecting the partial bodies.

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