JP7399512B2 - Reverse rotation prevention structure of screw fastening mechanism and intervening member of screw fastening mechanism - Google Patents

Description

The present invention relates to a reverse rotation prevention 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 have been used to fasten objects to be fastened in various situations. For example, in the case of a screw fastening mechanism that uses a male screw and a female screw, in order to screw the female screw into the male thread 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 head of the male screw. The objects to be fastened are fastened by sandwiching the objects to be fastened by the female screw and the female thread. Furthermore, 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 are made up of an integral plate, into which a plurality of bolts can be inserted, and in which projections and depressions are fitted between the bolts (for example, see Patent Document 1). Further, Patent Document 1 describes a washer that slidably supports a bolt inserted therethrough, thereby allowing a bolt insertion hole to be displaced in accordance with the relative positions of the bolts. Examples of such a washer include a washer in which the hole into which the bolt is fitted is made into an elongated hole, and a washer in which the bolt is fitted with a plurality of intervening bodies. A washer that can be slidably assembled is disclosed.

JP2015-72056A

In the washer described in Patent Document 1 mentioned above, when the hole into which the bolt is fitted is made into a long hole, the fitting area between the bolt and the washer is reduced compared to when the bolt is fitted into a circular hole. However, there is a problem in that the fit between the bolt and washer is weakened. In addition, if the washer is made up of multiple intervening bodies, each intervening body is fixed to the object to be fastened with bolts, and the intervening bodies are aligned by fitting them together, so it is difficult for an inexperienced worker to do so. If the correct method for assembling the intervening bodies and the procedure for configuring the washer is not known, there is a risk that due to human error, the washer may be fixed to the object to be fastened without assembling the washer, that is, the intervening bodies do not fit together. .

The present invention has been achieved through intensive research by the inventor in view of the above problems, and has a simple structure to prevent reverse rotation of an advanced screw fastening mechanism, that is, to reliably prevent the screw fastening mechanism from loosening. In addition, it is an object of the present invention to provide a means for making it possible to displace a position that can be engaged with a screw fastening mechanism.

The relative rotation prevention structure of the screw fastening mechanism of the present invention is such that a screw is assembled to a plurality of fastening bodies arranged at intervals for fixing the fastened bodies to fix the fastened bodies. A structure for preventing relative rotation of a fastening mechanism, wherein the screw fastening mechanism includes a fastening body and an intervening member interposed between the fastening body and the fastened body, and the fastening body has a male threaded portion through which the fastening body is inserted into the fastened body. The intervening member can insert the male threaded part, has a plurality of insertion parts having insertion holes, and a connecting part that connects the insertion parts to each other, and the intervening member has a It is characterized in that it includes a rotation prevention mechanism that restricts rotation, and that the relative positions of the insertion holes can be changed 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 part that can be screwed into the male threaded part, and the intervening member is disposed between the female threaded body and the object to be fastened. The female threaded body has a female threaded side rotation preventing portion that can prevent relative rotation with respect to the male threaded portion in the fastened state, and the intervening member engages with the female threaded side rotation preventing portion provided on the insertion portion to prevent the female threaded body from rotating relative to the male threaded portion in the fastened state. It is characterized by having an intervening member-side rotation prevention part that can prevent relative rotation with respect to the male threaded part.

Further, the relative rotation prevention structure of the screw fastening mechanism of the present invention includes a rotation prevention mechanism provided in the male thread part, a male thread side rotation prevention part that can prevent relative rotation with respect to the intervening member, and a rotation prevention mechanism provided in the insertion part. The intervening member-side rotation prevention portion is capable of engaging with the male-thread side rotation prevention portion to prevent relative rotation of the male-thread portion with respect to the object to be fastened.

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

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

Further, the relative rotation prevention structure of the screw fastening mechanism of the present invention is characterized in that the female thread body has female thread side rotation prevention portions on the front and back surfaces arranged along the axis.

Further, the intervening member of the screw fastening mechanism of the present invention is a screw fastening mechanism arranged between a plurality of fastened bodies arranged at intervals and a fastened body, and fixes the fastened bodies. An intervening member that can be inserted into the male threaded portion of the fastening body, and that engages with the fastening body, and is formed on the front and back surfaces of the insertion portions along the axis of the through holes. The present invention is characterized in that it has a rotation prevention part that restricts the rotation of the fastening body, and a connecting part that connects the insertion parts to each other, and the relative position of the insertion holes can be changed by changing the angle of the connecting part.

Further, in the intervening member of the screw fastening mechanism of the present invention, the fastening body includes a head of a male threaded body, the head can engage with a rotation prevention part, and has a male thread side rotation prevention part that restricts relative rotation. Features.

Further, the intervening member of the screw fastening mechanism of the present invention is a female threaded body that allows the fastening body to be screwed into the male threaded part, and the female threaded side rotation prevention part that can engage with the rotation prevention part and restricts relative rotation. It is characterized by having the following.

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

Moreover, the intervening member of the screw fastening mechanism of the present invention is characterized in that the relative position of the insertion holes is changed by elastically and/or plastically deforming the connecting portion.

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

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

It is a partial cross-sectional view showing the reverse rotation prevention structure of the screw fastening mechanism according to the first embodiment. It is a figure showing a male screw body of a first embodiment. The intervening member of the first embodiment is shown, with (a) being a plan view and (b) being a side view. The female threaded body of the first embodiment is shown, with (a) being a side view and (b) being a sectional view. 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 example of the shape of the unevenness|corrugation of an engagement groove part and an engagement protrusion part. FIG. 7 is a diagram showing another example of the direction in which the projections and depressions of the engagement groove and the engagement protrusion extend. It is a figure which shows other examples of an intervening member. FIG. 7 is a diagram showing an intervening member of a second embodiment. A partial body for configuring an intervening member according to a second embodiment is shown, with (a) being a plan view and (b) being a sectional view. It is a figure which shows the displacement of the relative position of insertion parts by the intervening member based on 2nd embodiment. It is a figure which shows the intervening member which formed the engagement groove part on both surfaces. It is a figure which shows the internally threaded body which formed the engaging protrusion part on both surfaces. It is a figure which shows the screw fastening structure when an intervening member and a male thread body engage. It is a figure which shows the other example of the partial body which forms an intervening member.

The 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 sectional view showing a reverse rotation prevention structure of a 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 in which a plurality of insertion holes 24 are formed, and a male screw body 10, and bodies 100 and 110 to be fastened. The objects to be fastened 100 and 110 are fastened together by a screw fastening body consisting of a male threaded body 10 and a 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 12 and a shaft portion 14 . A fastening portion side seat portion 12a is formed at a portion corresponding to the lower portion or root of the head 12. The shaft portion 14 is formed with a cylindrical portion 14a and a male threaded portion 14b, and a male threaded helical 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, with (a) being a plan view and (b) being a side view. The intervening member 20 includes a plurality of insertion portions 22 and a connecting portion 28 that connects the insertion portions 22 to each other. Although there are two insertion portions 22 here, the number of insertion portions 22 can be set as appropriate, 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 into which the shaft portion 14 can be inserted, and an engagement groove portion 26 (intervening member side rotation prevention portion) formed to surround the insertion hole 24. Further, the width (surface area) of the insertion portion 22 is set so that it can come into contact with substantially the entire end surface of the female threaded body 30.

The engagement groove portion 26 is formed in a concave shape with a tapered inner circumferential surface and a substantially truncated conical cross section at one end surface (the upper end surface shown in FIG. 3(b)) that abuts the female threaded body 30. Further, a plurality of irregularities are formed along the circumferential direction on the tapered inner circumferential surface of the engagement groove portion 26. This 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, In other words, the direction in which the ridge line extends is set along the radial direction of the insertion hole 24. Therefore, the unevenness on the inner circumferential surface of the engagement groove portion 26 extends radially from the axis of the insertion hole 24 .

The shape of the connecting portion 28 is set so that it can be elastically and/or plastically deformed by applying an external force of a predetermined magnitude or more. Here, the central part of the intervening member 20 existing between the insertion parts 22 in plan view is the connecting part 28, and the connecting part 28 has a shape that is narrower than the insertion part 22 and easily deformed by external force. . That is, the connecting portion 28 is a portion disposed between the insertion portions 22, and the width perpendicular to the imaginary line connecting the axes of the two insertion holes 24 is narrower than the width of the insertion portion 22. Set. Thereby, the connecting portion 28 can be deformed along the width direction by applying an external force of a predetermined amount or more. 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 that the thickness of the connecting part 28 in the axial direction is set thinner than that of the insertion part 22.

Further, the external force of a predetermined magnitude for bending the connecting portion 28 described above may be an external force that can be applied manually, or may be an external force that can be applied using various tools, but the usage environment It is set appropriately according to the size of the objects 100 and 110 to be fastened, the size of the female threaded body 30, etc.

FIG. 4 shows the female threaded body 30 of the first embodiment, with (a) being a side view and (b) being a sectional view. The female threaded body 30 is a so-called hexagonal nut, and includes a cylindrical portion 32. A female threaded portion 34 is formed on the inner circumferential surface of the cylindrical portion 32. .

Further, an engagement protrusion 36 (female thread side rotation prevention part) that engages with the engagement groove 26 is formed on one end surface of the female thread body 30 in the axial direction. The engagement protrusion 36 protrudes from one end surface along the axial direction in a substantially truncated conical shape, and has a plurality of irregularities formed along the circumferential direction on its tapered outer circumferential surface. The unevenness has a sawtooth shape (for example, see FIG. 6(a)), and is set so that the direction in which the unevenness extends, that is, the direction in which the ridge line extends, is along the radial direction of the female threaded body 30. As a result, the irregularities on the tapered outer circumferential surface of the engagement protrusion 36 extend 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 100a, 110a are formed at positions corresponding to each other in the bodies 100, 110 to be fastened, and communicate with each other when the bodies 100, 110 to be fastened are fastened by the screw fastening mechanism 1.

Here, the fastening of the fastened objects 100 and 110 will be explained. 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 into the through holes 100a and 110a. At this time, it is assumed that the fastening portion side seat portion 12a of the head 12 contacts the fastened body 110, and the fastened body 100 is disposed on the tip side of the shaft portion 14.

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

Thereby, a first rotation prevention mechanism is configured between the intervening member 20 and the female threaded body 30, which restricts the relative rotation of the female threaded body 30 with respect to the intervening member 20. Further, a second rotation prevention mechanism is configured between the intervening member 20 and the plurality of female threaded bodies 30 to restrict the relative rotation of the intervening member 20 with respect to the objects to be fastened 100 and 110.

The first rotation prevention mechanism is constituted by engagement between the engagement groove 26 of the intervening member 20 and the engagement protrusion 36 of the female threaded body 30. Specifically, when the female threaded body 30 rotates in the tightening direction and moves toward the intervening member 20, the engagement protrusion 36 enters the engagement groove 26. Further, when the female screw body 30 rotates in the tightening direction, the projections and depressions of the engagement protrusion 36 and the projections and depressions of the engagement groove 26 engage with each other.

Here, the sawtooth shape of both is such that when the female threaded body 30 rotates in the fastening direction, the inclined surfaces (or the surfaces with a gentler slope) contact each other, and the distance between the two is narrowed in the axial direction, allowing 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 a stronger inclination) contact each other to prevent relative movement between the two.

Therefore, in the first rotation prevention mechanism, by tightening the female threaded body 30, the engagement between the engagement protrusion 36 and the engagement groove 26 is strengthened, and the strength to resist rotation in the loosening direction of the female threaded body 30 is improved. This acts as a reliable locking mechanism for the female threaded body 30.

The second anti-rotation mechanism is configured by 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 that could cause the intervening member 20 to rotate is applied, the rotation is regulated and rotation of the intervening member 20 is prevented. It functions as a mechanism.

In the screw fastening mechanism 1 described above, the distance between the through holes 100a (and the through holes 110a) of the fastened body 100 (and the fastened body 110) does not match at each location due to various reasons such as design errors. Even if there is no intervening member 20, by deforming the intervening member 20, the relative positions of the insertion portions 22 can be displaced and fixed to the objects to be fastened 100, 110. Specifically, as shown in FIG. 5, in the intervening member 20, when the connecting portion 28 is bent, the relative position of the insertion holes 24 changes due to a change in the angle of the connecting portion 28. As a result, by increasing the angle change of the connecting portion 28 from the initial state shown in FIG. Even if the distance between the holes 100a (and the through holes 110a) varies from place to place, the male threaded body 10 can be reliably inserted through the 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 engage with each other by the first rotation prevention mechanism, and the female threaded body 30 engages with the male threaded body 10. On the other hand, rotation in the loosening direction can be restricted. Further, the intervening member 20 is prevented from rotating relative to the fastened bodies 100 and 110 by the respective male screw bodies 10 by the second rotation prevention mechanism. Therefore, even if vibration or the like occurs, a fastened state that does not loosen at all can be obtained. Furthermore, by bending the connecting portion 28 and changing the angle, it is possible to change the relative position of the through holes 24, so even if the distance between the through holes 100a varies from place to place, the same type of intervening member 20 can be changed. The male threaded body 10 and the female threaded body 30 can be fastened together through the connector. Further, since the insertion portion 22 of the intervening member 20 contacts substantially the entire end surface of the female threaded body 30, the intervening member 20 can be stably engaged with the female threaded body 30 even if the relative positions of the insertion portions 22 are displaced.

In addition, since the relative positions of the insertion parts 22 are changed by deforming the connection part 28, the insertion parts 22 are always connected to each other, so that when a washer is configured with a plurality of intervening bodies as described in Patent Document 1, In comparison, the rotation prevention function of the intervening member 20 with respect to the objects to be fastened 100 and 110 will not be impaired due to human error, and rotation of the intervening member 20 with respect to the objects to be fastened 100 and 110 can be reliably prevented. .

Although 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)), the present invention is not limited to this. For example, as shown in FIG. 6(b), it may be a mountain shape formed by an inclined surface, or as shown in FIG. 6(c), it may be a waveform with curved peaks and valleys.

In addition, although the direction in which the unevenness extends is assumed to be the radial direction, as shown in FIG. 7(a), the unevenness extends in a spiral shape, and as shown in FIG. 7(b), the circumferential phase is different from the radial direction. It may be unevenness extending linearly in an inclined direction so as to change.

Further, the shape of the intervening member 20 is not particularly limited as long as the plurality of insertion parts 20 are connected by the connecting part 28. For example, as shown in FIG. As shown in FIG. 8(b), the insertion portion 20 may have a substantially rectangular outer shape in plan view, and the corner portions of the rectangle may be connected to each other as a connecting portion. .

Next, a screw fastening mechanism 1 according to a second embodiment will be explained. Here, 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. Note that the screw fastening mechanism 1 of the second embodiment differs from the screw fastening mechanism 1 of the first embodiment in that a plurality of partial bodies 52 and 54 are connected to form an intervening member 50.

FIG. 9 is a diagram showing an intervening member according to the second embodiment, and FIG. 10 is a partial body for configuring the intervening member according to the second embodiment, in which (a) is a plan view and (b) is a cross-sectional view. It is a diagram. The intervening member 50 according to the second embodiment is configured by connecting the partial bodies 52 and 54 through a connecting portion 60 so as to be relatively rotatable. As shown in FIG. 10, each of the partial bodies 52 and 54 has an insertion portion 22 formed therein. Further, the partial body 52 forms a part of the connecting portion 60 and includes a connecting region 52a having a concave upper surface. A fitting protrusion 56 having a convex shape is formed approximately at the center of the connecting region 52a. On the other hand, the partial body 54 forms a part of the connecting portion 60 and includes a connecting region 54a having a concave lower surface. Furthermore, a fitting hole portion 58 into which the fitting protrusion 56 can fit is formed approximately at the center of the connecting region 54a.

The thickness of the connecting regions 52a and 54a along the axial direction of the insertion hole 24 is set to approximately half the thickness of the insertion portion 22. Therefore, the partial body 52 has a step 53 between the insertion portion 22 and the connection region 52a on the upper surface portion in the orientation shown in FIG. 9(b). Similarly, the partial body 54 has a step 55 between the insertion portion 22 and the connecting region 54a on the lower surface thereof. The step 53 is formed to extend substantially linearly in plan view, as shown in FIG. 9(a). Note that the step 55 is also formed to extend substantially linearly in plan view, similarly to the step 53. Furthermore, when the intervening member 50 is formed, the directions in which the steps 53 and 55 extend are set so that they form a symmetrical shape with the connecting portion 60 as the center.

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. At this time, the upper surfaces of the partial bodies 52 and 54 are aligned substantially flush with each other, and the lower surfaces thereof are aligned substantially flush with each other, forming the intervening member 50.

In this way, the fitting protrusion 56 is fitted into the fitting hole 58 and the connecting regions 52a and 54a are connected to each other, thereby forming the connecting portion 60. Specifically, this is done by fitting the fitting protrusion 56 into the fitting hole 58 so that the upper surface of the connecting region 52a and the lower surface of the connecting region 54a are in contact with each other. Thereby, the partial body 52 can rotate relative to the partial body 54 around the connecting portion 60 (fitting protrusion 56). Therefore, the connecting portion 60 functions to displace the relative position between the insertion portion 22, that is, between the partial bodies 52 and 54.

Here, FIG. 11 is a diagram showing displacement of the relative positions of the insertion portions 22 by the intervening member 50 according to the second embodiment. FIG. 11A shows a first state in which the distance between the partial bodies 52 and 54 is the longest, and in the first state, the fitting protrusion 56 and the axis 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 based on the first state. FIG. 11(b) shows a state between the first state and a restricted 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. Further, FIG. 11(c) shows a restricted state in which the partial body 52 has rotated to the limit of its rotatable range (restricted position). Here, the restriction position is a position where the step 53 of the partial body 52 is in contact with the side surface of the partial body 54, and a position where the step 55 of the partial body 54 is in contact with the side surface of the partial body 52. That is, since the partial body 52 (partial body 54) comes into contact with the step 55 (step 53), further rotation is restricted.

In this way, the partial body 52 comes into contact with the step 55, and the partial body 54 comes into contact with the step 53, thereby forming the restricted state of the intervening member 50, and when the restricted state is reached, the distance between the insertion portions 22 is at its maximum. be shortened. Therefore, in the intervening member 50, the relative positions of the insertion portions 22 are displaced in the order of the first state, the second state, and the restricted state so that the distance between the insertion portions 22 can be shortened.

As explained 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 the other. This allows the relative positions of the insertion portions 22 to 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 either one, the intervening member 50 can be placed in the first state, the second state, or the restricted state. Since the intervening member 50 remains configured, the insertion portion 22 can be aligned and disposed between the body 100 to be fastened and the female threaded body 30. That is, the intervening member 50 can be configured and disposed between the fastened body 100 and the female threaded body 30 so that the partial bodies 52 and 54 cannot be separated. Therefore, it is possible to reliably prevent only the partial body from being disposed between the fastening body 100 and the female threaded body 30 without forming the intervening member 50 due to human error or the like.

In the second embodiment, the partial bodies 52 and 54 are connected by fitting the fitting protrusion 56 into the fitting hole 58, but the invention is not limited to this. After fitting into the hole 58, the fitting protrusion 56 may be caulked. In addition, instead of the fitting protrusion 56 and the fitting hole 58, holes are provided in the connection area 52a of the partial body 52 and the connection area 54a of the partial body 54, respectively, and both holes are made to communicate with each other and a pin is inserted into the part. The bodies 52, 54 may be coupled for relative rotation.

In addition, in each embodiment mentioned above, the case where the engagement groove part 26 was formed only in one surface of the intervening member was demonstrated, but the engagement groove part 26 may be made to be formed in both surfaces. For example, in the intervening member 20 according to the first embodiment, as shown in FIG. 12, engagement grooves 26 are formed on two surfaces arranged along the axial direction of the insertion hole 24.

By using the intervening member 20 in which the engagement groove portions 26 are formed on two surfaces 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 do it. That is, in the screw fastening mechanism 1 according to the first embodiment, there is a possibility that the intervening member 20 is arranged in a direction in which the engagement groove 26 is oriented 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 rotation prevention mechanism is not formed. On the other hand, if the engagement grooves 26 are formed on two surfaces arranged along the axial direction of the intervening member 20, the first rotation prevention mechanism can be reliably formed no matter which direction the intervening member 20 is arranged. can do.

Similarly, in the female threaded body 30, as shown in FIG. Since the engagement protrusion 36 reliably engages the engagement groove 26 in either direction, the first rotation prevention mechanism can be formed.

Furthermore, although the above-described screw fastening structure 1 has been described as one in which the intervening member 20 and the female threaded body 30 engage with each other, it may, of course, engage with the male threaded body 10. For example, a fastened body 100 shown in FIG. 14 is formed with a plurality of female screw holes 100a that are screwed into male threaded parts, and when a fastened body 110 is fixed between the fastened body 100 and the male threaded body 10, , an intervening member 20 is disposed between the male threaded body 10 and the fastened body 110. In such a case, an engagement protrusion 13 corresponding to the engagement protrusion 36 is formed on the side seat portion 12a of the fastening portion of the head 12 of the male threaded body 10, and the engagement protrusion 13 corresponding to the engagement protrusion 13b of the male threaded body 10 is interposed. The member 20 is engaged with the engagement groove 26 .

Moreover, although the case where the intervening member 20 has the engaging groove part 26 and the female threaded body 30 has the engaging protrusion part 36 has been described as an example, the present invention is not limited to this, and the intervening member 20 has the engaging protruding part. The female screw body 30 may have an engagement groove.

Further, in the intervening member 50 according to the second embodiment described above, the steps 53 and 55 of the partial bodies 52 and 54 are extended in a substantially straight line in plan view, but the present invention is not limited to this. The shape may be bent and stretched. With such a bent shape, the range of relative rotation between the partial bodies 52 and 54 can be narrowed or expanded compared to when the partial bodies 52 and 54 have a straight shape.

For example, when the step 53 in the portion 52 is bent so as to reduce the area of the connection region 52a, that is, as shown in FIG. When the step 53 is bent at the center so as to be inclined toward the distal end side, the range in which the partial bodies 52 and 54 can rotate relative to each other is different from that in the second embodiment described above. to zoom out. Further, when the step 53 is bent so as to expand the area of the connecting region 52a, that is, as shown in FIG. 15(b), both ends of the step 53 along the extending direction are inclined toward the insertion portion 22. Thus, when the step 53 is bent at the center, the range in which the partial bodies 52 and 54 can rotate relative to each other is expanded compared to the case of the second embodiment described above.

DESCRIPTION OF SYMBOLS 1... Screw fastening mechanism, 10... Male thread body, 12... Head, 12a... Fastening part side seat part, 14... Shaft part, 14a... Cylindrical part, 14b... Male thread part, 20, 50... Intervening member, 22... Insertion part , 24... Insertion hole, 26... Engagement groove, 28, 60... Connection part, 30... Female threaded body, 32... Cylindrical part, 34... Female threaded part, 36... Engagement protrusion, 52, 54... Partial body, 52a, 54a... Connection region, 56... Fitting projection, 58... Fitting hole portion, 100, 110... Fastened body, 100a, 110a... Through hole.

Claims (10)

A relative rotation prevention structure for a screw fastening mechanism that is assembled to a plurality of fastening bodies arranged at intervals to fix the fastened bodies to fix the fastened 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 threaded portion that is inserted into the fastened body,
The intervening member has a plurality of insertion parts through which the male thread part can be inserted and has an insertion hole, and a connecting part that connects the insertion parts to each other,
A rotation prevention mechanism is provided between the fastening body and the intervening member to restrict relative rotation therebetween;
The connecting portion can be deformed along a plane perpendicular to the axis of the insertion holes so as to change the relative position of the insertion holes ,
The width of the connecting portion is narrower than the width of the insertion portion, and the connecting portion is elastically and/or plastically deformed to change the relative positions of the insertion holes. Features a relative rotation prevention structure for the screw fastening mechanism. The fastening body includes a female threaded body having a female threaded part that can be screwed into the male threaded part,
The intervening member is arranged between the female threaded body and the fastened body,
The female threaded body has a female thread side rotation prevention portion capable of preventing relative rotation in a fastened state with respect to the male threaded portion,
The intervening member is characterized in that it has an intervening member side rotation prevention part that can engage with the female thread side rotation prevention part provided on the insertion part to prevent relative rotation of the female threaded body with respect to the male thread part. A relative rotation prevention structure for a screw fastening mechanism according to claim 1. The rotation prevention mechanism is
a male thread side rotation prevention portion provided on the male thread portion and capable of preventing relative rotation with respect to the intervening member;
Claim 1 characterized by comprising an intervening member side rotation prevention part provided in the insertion part that can engage with the male thread side rotation prevention part to prevent relative rotation of the male thread part with respect to the fastened body. Relative rotation prevention structure of the screw fastening mechanism described in . Reverse rotation of the screw fastening mechanism according to claim 2 or 3 , wherein the intervening member side rotation prevention portion is formed on the front and back surfaces of the intervening member arranged along the axis of the insertion hole. Prevention structure. 3. The relative rotation prevention structure for a screw fastening mechanism according to claim 2 , wherein the female thread body has the female thread side rotation prevention portions on front and back surfaces arranged along the axis. An intervening member of a screw fastening mechanism for fixing the objects to be fastened, which is arranged between a plurality of fasteners arranged at intervals and the object to be fastened,
a plurality of insertion portions having insertion holes through which the male threaded portion of the fastening body can be inserted;
a rotation prevention portion that is formed on the front and back surfaces of the insertion portion along the axis of the insertion hole and that can engage with the fastening body and restricts rotation of the fastening body;
a connecting part that connects the insertion parts,
An intervening member of a screw fastening mechanism, wherein the connecting portion can be deformed along a plane perpendicular to the axis of the insertion holes so as to change the relative position of the insertion holes. The fastening body includes a head of a male threaded body,
7. The intervening member of the screw fastening mechanism according to claim 6 , wherein the head has a male thread side rotation prevention part that can engage with the rotation prevention part and restricts relative rotation. 7. The intervening member of the screw fastening mechanism according to claim 6, wherein the rotation prevention portion engages with a rotation prevention portion on the female thread side of the female thread body. The width of the connecting portion is narrower than the width of the insertion portion, and the connecting portion is elastically and/or plastically deformed to change the relative positions of the insertion holes. An intervening member of a screw fastening portion according to any one of claims 6 to 8 . The present intervening member consists of a plurality of partial bodies including the insertion portion,
The intervening member of a screw fastening mechanism according to any one of claims 6 to 8, wherein the connecting portion has a connecting means for rotatably connecting the partial bodies to each other.

Images