JP2016003663A - Fixing bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely rotate a rotation lock member which is rotated in a hollow space within a structure and becomes an anchor, regardless of a direction of insertion, the fixing bolt including the rotation lock member.SOLUTION: In a fixing bolt 11 including a bolt body 12 and a rotation lock member 13, the rotation lock member 13 is formed into a shape, of which the cross section is U-shaped, including a pair of sidewall parts 31 which are disposed at an interval while interposing the bolt body 12 therebetween, and a bottom plate part 32 connecting the sidewall parts 31 with each other. One end portion 22 of the bolt body 12 is pivoted between the sidewall parts 31, and a leaf spring 15 is held on the bottom plate part 32. The leaf spring 15 includes an action part 54 which is fixed in one end portion 32 of the bottom plate part 32 in a length direction, extends a distal end side to a side of another end portion 32b along an inner surface of the bottom plate part 32, extends obliquely in a direction away from the bottom plate part 32 in the middle, and is abutted to a side surface of the bolt body 12 when the rotation lock member 13 is rotated in one direction and becomes oblique to the bolt body 12, such that effects of spring elasticity are stabilized.

Description

  The present invention relates to a fixing bolt that is preferably used when an article is fixed to a structure having a hollow inside from the outside.

  Examples of the structure having a hollow inside include a steel pipe, a housing, a wall, a roof, and a building plate. Even if an object is fixed to such a structure using bolts and nuts from the outside, it cannot be fixed unless the nut can be rotated within the structure.

  For example, one of the building boards is an extruded cement board. This extruded cement board is preferably used for an outer wall or the like. As shown in FIG. 10, the extrusion-molded cement board 101 has a rectangular plate shape and has protrusions 102 or grooves 103 for fitting on the long side, and between the protrusions 102 and the grooves 103 inside. In addition, a plurality of long hollow portions 104 are arranged in parallel along the longitudinal direction.

  In order to fix the extruded cement plate 101 having such a configuration as an outer wall or the like, it is necessary to fix a predetermined metal fitting 105 to the outer surface of the extruded cement plate 101 as shown in FIG. As shown in FIG. 11, the metal fitting 105 is fixed by making a hole 106 in the fixed-side surface of the extruded cement plate 101 and inserting a square nut 108 while supporting the hollow portion 104 with an insertion tool 107. This is done by screwing the hexagon bolt 109 from above.

  The insertion tool 107 is required, and it is difficult to insert the square nut 108 at a predetermined position, so that workability is not good.

  Conventionally, as a bolt that can be used for a structure having a hollow inside, a suspension bolt as in Patent Document 1 below and a board anchor as in Patent Document 2 below have been proposed.

  The suspension bolt of Patent Document 1 has a concave groove extending in the axial direction of the bolt at one end of the bolt, and a rod-like or plate-like suspension fitting (rotation locking member) is pivotally attached to the concave groove. Structure. The suspension fitting pivots at a position that is biased to one side from the middle position in the longitudinal direction. Thereby, when the part by the side of the suspension metal fitting of a suspension bolt is inserted in fixation object, a suspension metal fitting becomes easy to rotate.

  However, since the suspension fitting is merely pivotally attached, the rotation must be left to the natural state, and it is uncertain, and it is necessary to vibrate greatly after inserting the suspension bolt in order to rotate the suspension fitting. In addition, when the suspension bolt of Patent Document 1 is inserted with the suspension fitting down, the suspension fitting does not automatically rotate after insertion, and thus cannot be used.

  The board anchor of Patent Document 2 has a screw shaft and an anchor portion (rotating locking member) that is rotatably attached to the screw shaft via an attachment member. The attachment member has a ring shape and is screwed onto the tip of the screw shaft. An anchor part is provided with the leaf | plate spring which urges | biases so that an anchor part may become the direction orthogonal to a screw axis in the screwing state with respect to the screw axis of an attachment member. That is, the anchor part is rotated by the urging force of the leaf spring, and the certainty that the desired rotation is performed can be increased.

  However, this leaf spring is fixed to one end portion of the anchor portion in the longitudinal direction, and when the anchor portion is rotated from a state perpendicular to the screw shaft to a direction along the screw shaft, the tip portion of the leaf spring is screwed. It is configured to abut against the side surface of the shaft and accumulate an urging force by further rotation.

  Since this is a leaf spring, if the urging force is not stable because the tip of the leaf spring is caught by the thread of the screw shaft, or if the force required to deform the leaf spring is too strong to insert, the leaf spring There have been cases where the leaf springs have become useful before actual construction is performed due to deformation or displacement. For this reason, the desired effect of reliably rotating the anchor portion may not be obtained.

Japanese Utility Model Publication No. 53-18462 Japanese Patent No. 3734146

  Accordingly, the main object of the present invention is to ensure that the rotation locking member can be rotated in any case and to be easy to use.

  Means therefor is a fixing bolt comprising a bolt body having an external thread on the outer peripheral surface, and a rotation locking member formed longer than the diameter of the bolt body and rotatable relative to the bolt body, The rotation locking member includes a pair of side wall portions arranged at an interval across the bolt main body, and a bottom plate portion that connects the side wall portions, and the pair of side wall portions with respect to one end portion of the bolt main body. The leaf spring is held by the bottom plate portion, the leaf spring is held at one end portion in the longitudinal direction of the bottom plate portion, and the bottom plate in the holding portion. Extending from the portion corresponding to the inner surface of the portion toward the other end side in the longitudinal direction of the bottom plate portion, extending along the inner surface of the bottom plate portion, and extending from the tip of the extension portion and away from the inner surface of the bottom plate portion Inclined to the rotation locking part A fixing bolt having a working portion which abuts against the side surface of the bolt body when it is oblique to the bolt body rotates in one direction.

  When the fixing bolt of this configuration is relatively rotated so that the longitudinal direction of the rotation locking member and the longitudinal direction of the bolt body are aligned, the surface of the action portion of the leaf spring comes into contact with the side surface of the bolt body, and further rotation causes The action part is elastically deformed and accumulates the urging force. When the bolt main body and the rotation locking member are aligned in the longitudinal direction and inserted into the fixation target, the rotation locking member rotates inside the fixation target due to the urging force accumulated in the leaf spring, and the rotation locking member It will be in the state of retaining it perpendicular to the bolt body. A leaf | plate spring is hold | maintained at the baseplate part which connects the side wall parts of a rotation latching member, and is a state with high integration with respect to a baseplate part by a holding | maintenance part and an extension part.

  According to the present invention, since the rotation locking member is rotated by the urging force of the leaf spring, a reliable retaining state can be obtained regardless of the direction in which the fixing bolt is used. In addition, the urging force of the leaf spring is stored with the surface of the working portion abutting against the side surface of the bolt body, and the leaf spring is held with high integrity on the bottom plate portion of the rotation locking member, so that an unexpected misalignment may occur. Because there is no power, the dominant power is always stable and easy to use.

The perspective view of a bolt for fixation. The exploded perspective view of the bolt for fixation. The front view of a bolt for fixation. Sectional drawing which shows the usage condition of a volt | bolt for fixing. Sectional drawing which shows the usage condition of a volt | bolt for fixing. Sectional drawing and the top view which show the other example of a washer. Sectional drawing which shows the use condition of the volt | bolt for fixing. Sectional drawing which shows the use condition of the volt | bolt for fixing. The disassembled perspective view which shows the use condition of a volt | bolt for fixing. The perspective view which shows an example of a prior art. Sectional drawing which shows an example of a prior art.

An embodiment for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a fixing bolt 11. The fixing bolt 11 is used to fix an article from the outside to a structure having a hollow inside.

  As shown in FIG. 2, the fixing bolt 11 includes a bolt main body 12 and a rotation locking member 13 that is formed longer than the diameter of the bolt main body 12 and is rotatable relative to the bolt main body 12.

  The bolt main body 12 has a round bar shape and has a male screw 21 on the outer peripheral surface from a portion on one end side to the other end. The male screw 21 is a portion into which a nut 61 for tightening as shown in FIG. 3 is screwed. One end portion 22 of the bolt body 12 is a portion that does not have the male screw 21, and a shaft hole 23 for pivot attachment is formed.

  The length and thickness of the bolt body 12 are appropriately set according to the location and purpose of using the fixing bolt 11.

  The rotation locking member 13 includes a pair of side wall portions 31 arranged at an interval across the one end portion 22 of the bolt main body 12 and a bottom plate portion 32 that connects the side wall portions 31 to each other. The side wall portion 31 and the bottom plate portion 32 have a strip shape and are set slightly wider than the diameter of the bolt body 12. The side wall portion 31 has a corner radius portion 33 at a corner opposite to the bottom plate portion 32.

  The length of the side wall portion 31 is appropriately set according to the location and purpose of using the fixing bolt 12. The bottom plate portion 32 is formed at a position that fits within the length of the side plate portion 31.

  A through hole 34 through which the shaft member 14 as a shaft portion for pivotally attaching the bolt body 12 is formed at an intermediate position in the longitudinal direction of the side wall portion 31 and an intermediate position in the width direction. That is, when one end portion 22 of the bolt body 12 is inserted between the pair of side wall portions 31 and the shaft member 14 is inserted and held in the through hole 34 of the side wall portion 31 and the shaft hole 23 of the bolt body 12, the side wall portion 31 is The bolt body 12 is held rotatably with respect to the one end portion 22.

  A plurality of anti-rotation protrusions 36 are formed on the edge 35 of the side wall 31 opposite to the bottom plate 32 at intervals in the longitudinal direction of the side wall 31. The anti-rotation protrusion 36 protrudes appropriately from the edge 35 and is provided one by one on both sides with an intermediate position in the longitudinal direction interposed therebetween. A plurality of anti-rotation protrusions 36 may be formed in a concavo-convex shape on both sides of the intermediate position in the longitudinal direction. The anti-rotation protrusion 36 has an anti-rotation action and also has a positioning action with respect to the opposing portion.

  The bottom plate portion 32 of the rotation locking member 13 includes a leaf spring 15 for biasing the rotation locking member 13 so as to cross the bolt main body 12.

  For this reason, the bottom plate part 32 has a square hole 37 through which the leaf spring 15 is fixed at one end 32a in the longitudinal direction, and a part of the elastically deformed leaf spring 15 at the other end 32b in the longitudinal direction. It has the notch part 38 which misses.

  The leaf spring 15 is a plate having an appropriate width narrower than the bottom plate portion 32, and has a holding portion 51 held at one end portion 32 a in the longitudinal direction of the bottom plate portion 32 at one end portion. As shown in FIGS. 2 and 3, the holding portion 51 is formed by being folded back with an interval sandwiching the bottom plate portion 32. The front portion 51 a of the holding portion 51 is in surface contact along the inner surface of the bottom plate portion 32, and the back portion 51 b is in surface contact along the outer surface of the bottom plate portion 32. A portion corresponding to the square hole 37 of the bottom plate portion 32 in the back side portion 51b of the holding portion 51 has a cut-and-raised portion 52 by making a U-shaped cut. When the cut-and-raised portion 52 is pushed into the square hole 37, the holding portion 51 can be prevented from being detached and positioned. The cut-and-raised part 52 preferably raises the side corresponding to the one end part 32 a side of the bottom plate part 32.

  The tip of the holding portion 51 of the leaf spring 15 extends from a portion of the holding portion 51 corresponding to the inner surface of the bottom plate portion 32 toward the other end portion 32b in the longitudinal direction of the bottom plate portion 32 and extends along the inner surface of the bottom plate portion 32. An extension 53 is provided. The entire surface of the extension portion 53 facing the surface is in surface contact with the inner surface of the bottom plate portion 32. The length of the extension portion 53 is slightly closer to the other end portion 32b side in the longitudinal direction than the portion corresponding to the bolt main body 12, specifically, the position corresponding to the shaft member 14 of the bolt main body 12 as shown in FIG. It is good to extend to the position.

  The tip of the extension portion 53 of the leaf spring 15 is inclined in a direction extending from the tip of the extension portion 53 and away from the inner surface of the bottom plate portion 32, and the rotation locking member 13 rotates in one direction with respect to the bolt body 12. It has the action part 54 which contact | abuts to the side surface of the bolt main body 12 when it becomes diagonal. The action part 54 is preferably formed in a straight line. Although the inclination angle of the action part 54 is appropriately set in relation to the position of the starting end of the action part 54, it is preferable that the inclination angle is in a range of about 30 degrees to 40 degrees, for example. Desirably, when the action part 54 contacts the bolt main body 12, the action part 54 and the bolt main body 12 may be set in parallel so that the entire longitudinal direction of the action part 54 contacts the bolt main body 12 at the same time.

  The length of the action portion 54, that is, the tip position of the action portion 54 is also set as appropriate. However, if the length is set within the side wall portion 31, the leaf spring 15 can be prevented from unexpectedly contacting other members. The leaf spring 15 may be protected.

  At the tip of this action part 54, there is a buffer bending part 55 that bends toward the bottom plate part 32 side in order to ease the contact with the side surface of the bolt body 12 and to smoothly deform the action part 54. The length of the buffer bending portion 55 may be short. Further, it is desirable that the buffer bending portion 55 bends at an obtuse angle with respect to the action portion 54.

  The buffer bending portion 55 is a portion that fits into a notch portion 38 formed in the other end portion 32 b of the bottom plate portion 32 when the action portion 54 is elastically deformed and has a shape along the inner surface of the bottom plate portion 32. That is, a cutout portion 38 that allows the buffer bending portion 55 to escape is formed in a portion corresponding to the buffer bending portion 55 when the action portion 54 of the bottom plate portion 32 is aligned with the inner surface of the bottom plate portion 32. Thus, the bolt main body 12 and the rotation locking member 13 can be transformed into a posture in which both longitudinal directions are parallel to each other.

  As shown in FIG. 3, the fixing bolt 11 configured in this way is used by holding the nut 61 and the washer 62 in advance or later on the portion having the male screw 21 of the bolt body 12. The nut 61 may be a nut with a washer.

  The fixing bolt 11 having such a configuration is used as follows. In use, the fixing bolt 11 is used in any orientation, so that the same effect is obtained. In FIGS. 4 and 5 showing the usage mode, the fixing bolt 11 is inserted with the rotation locking member 13 facing downward. An example is shown.

  First, as shown in FIG. 4, from the posture in which the rotation locking member 13 intersects the bolt body 12, the rotation locking member 13 is rotated relative to the side having the notch 38 of the rotation locking member 13, that is, the bottom plate. The other end portion 32b in the longitudinal direction of the portion 32 rotates in a direction to attract the bolt body 12. By this rotation, the action part 54 of the leaf spring 15 contacts the side surface of the bolt main body 12, and the action part 54 is deformed along the inner surface of the bottom plate part 32 by further rotation. The relative rotation of the rotation locking member 13 is performed until the fixing bolt 11 can be inserted into the through hole 72 of the fixing object 71.

  In this state, since the urging force is accumulated in the leaf spring 15, the rotation locking member 13 is inserted into the through hole 72 of the fixed object 71 and the entire rotation locking member 13 enters the internal space 73 of the fixed object 71. Then, the rotation locking member 13 is automatically rotated by the urging force, and changes to a posture intersecting with the bolt main body 12 and a posture orthogonal to each other, and a retaining state is obtained.

  Next, as shown in FIG. 5, when the bolt body 12 of the fixing bolt 11 is pulled in a direction away from the fixing object 71, the rotation locking member 13 becomes completely perpendicular to the bolt body 12, and the rotation engagement member 13 is rotated. The edge portion 35 of the side wall portion 31 of the stop member 13 comes into contact with the inner surface constituting the internal space 73 of the fixed object 71. Since the anti-rotation protrusion 36 is formed on the edge portion 35, the anti-rotation and positioning can be performed with respect to the inner surface of the inner space 73 of the fixed object 71. When the rotation locking member 13 rotates in a posture orthogonal to the bolt main body 12, since the side wall portion 31 has the corner radius portion 33, smooth rotation is possible without damaging the inner surface of the fixed object 71.

  In this state, the nut 61 is tightened. Since the rotation locking member 13 is prevented from rotating with respect to the fixed object 71 by the rotation preventing projection 36, the rotation locking member 13 can be easily screwed to the bolt body 12 integrated with the rotation locking member 13 in a non-rotatable state.

  The fixed state is maintained by tightening the nut 61. In this fixed state, the position of the fixing bolt 11 with respect to the through hole 72 of the fixing object 71 is stabilized by the positioning action by the rotation preventing projection 36.

  4 and 5 show an example in which only the fixing bolt 11 is fixed to the fixing object 71. However, when the article is also fixed to the fixing object 71 at the same time, the article having a through hole is set as the fixing object. Once again, the fixing bolt 11 is fixed as described above. When the nut 61 is not held in advance in the bolt body 12 of the fixing bolt 11, the article can be inserted and held in the bolt body 12 after the fixing bolt 11 is inserted and held in the fixing object 71.

  In addition, when the difference between the size of the through hole 72 of the fixing object 71 and the thickness of the bolt body 12 of the fixing bolt 11 is large and the position of the bolt body 12 needs to be regulated, FIG. As shown in FIG. 6B, a washer 63 having a position regulating function may be used. FIG. 6A is a sectional view in a separated state, and FIG. 6B is a plan view of the washer 63.

  In other words, the washer 63 has an arcuate fitting edge projecting toward the through hole 72 with a size corresponding to the through hole 72 of the fixing object 71 and a bolt hole 63a of a size corresponding to the bolt body 12 to be fitted. It is the structure which has two parts 63b alternately by the circumferential direction by making those centers the same. When such a washer 63 is used, the fitting edge 63b is fitted into the through hole 72 of the fixed object 71 and positioned with respect to the through hole 72, and the bolt body 12 is positioned through the through hole 72 of the fixed object 71 by the bolt hole 63a. Positioned in the center of

Hereinafter, some examples of use of the fixing bolt as described above will be described.
FIG. 7 is an example in which a C-shaped steel 74a as an article is used, which is used when a solar panel (not shown) or the like is installed on a folded plate roof 71a as a fixing object 71. The fixing bolt 11 is fixed to the through hole 72 portion of the folded plate roof 71a, and then the C-shaped steel 74a is fixed. In this case, since waterproofing is required between the folded plate roof 71 a and the fixing bolt 11, a seal washer 64 is provided between the nut 61 and the washer 62.

  FIG. 8 is an example used for construction of an outer wall of a building and repair of the outer wall. That is, in order to fix the trunk edge 74b as an article to a base 71b such as RC (steel reinforced concrete) or ALC (lightweight cellular concrete) as the fixing object 71, a through hole 72 having a predetermined diameter is formed in the base 71b. Then, the fixing bolt 11 is inserted into the through hole 72 from above the trunk edge 74b to perform the fixing as described above. After the nut 61 is tightened and fixed, if the excess portion of the bolt body 12 is cut, the protrusion of the bolt body 12 from the trunk edge 74b can be suppressed as necessary.

  FIG. 9 shows an example in which a metal fitting is fixed to the extrusion-molded cement board described in [Background Art]. That is, a through hole 72 is formed in one surface of an extruded cement plate 71c as a fixing object 71, and the rotation locking member 13 of the fixing bolt 11 is inserted into the through hole 72 to prevent the fixing bolt 11 from coming off. Subsequently, a metal fitting 74 c as an article is inserted into the bolt main body 12 protruding from the through hole 72 of the extrusion-molded cement board 71 c and fixed by the nut 61 and the washer 62. The metal fitting 74c is provided with a through hole 75 having a size corresponding to the fitting with the bolt body 12. When the fixing bolt 11 is fixed in this manner, the fixing bolt 11 is positioned by the anti-rotation protrusion 36, so that the positional deviation can be suppressed without using the washer 63 (see FIG. 6) having a position restricting function.

  The through hole 75 of the metal fitting 74c may be formed larger than the size corresponding to the bolt main body 12, and the fixing bolt 11 may be inserted from above the metal fitting 74c as described above. When using a washer 63 having a position regulating function (see FIG. 6), it is placed under the metal fitting 74c.

  The fixing bolt 11 to be used as described above is fixed because the rotation locking member 13 to be rotated when inserted into the through hole 72 of the fixing object 71 is reliably rotated by the urging force of the leaf spring 15. A reliable retaining state can be obtained regardless of whether the rotation locking member 13 of the bolt 11 is directed upward, downward or laterally.

  The leaf spring 15 that accumulates the urging force for the rotation is formed long from the one end portion 32 a of the rotation locking member 13 to the other end portion 32 b beyond the portion corresponding to the bolt body 12, and the rotation locking member 13. Since the contact portion 54 is provided at a relatively wide portion in the longitudinal direction of the bolt body 12, the contact portion 54 of the leaf spring 15 is provided. An excessive load is not applied to the portion, and sufficient spring elasticity can be obtained. In addition, the leaf spring 15 has a holding portion 51 that sandwiches the bottom plate portion 32 and an extension portion 53 that is in surface contact with the bottom plate portion 32, and is also locked by the cut-and-raised portion 52. Contributes to stability. For this reason, there is no inconvenience that the handedness of the leaf spring 15 is lowered or lost in use, and a reliable effect can be expected. Since the leaf spring 15 is fixed by the holding portion 51 that sandwiches the bottom plate portion 23, the assembling work is easy.

  Further, since the buffer portion 55 is provided at the tip of the action portion 54, the tip of the action portion 54 is not caught by the bolt body 12, and a flexible spring elasticity can always be obtained with certainty. Become. Further, since the buffer bending portion 55 has the cutout portion 38 that allows the action portion 54 to be deformed, the rotation locking member 13 can be made completely parallel to the bolt body 12, and the through hole 72 can be made relatively small. can do.

  When the rotation locking member 13 is rotated and the urging force is accumulated in the leaf spring 15, the rotation notch 38 of the rotation locking member 13 is rotated so as to be attracted to the bolt main body 12. Since the locking member 13 only needs to be rotated, the fingertip does not slip even when wearing gloves, and the operation can be performed reliably. In addition, the leaf spring 15 is held by the one end portion 32a of the bottom plate portion 32 of the rotation locking member 13 and extends to the other end portion 32b side as described above, and the other end portion 32b extends away from the bottom plate portion 32. Since the other end portion 32b of the bottom plate portion 32 has a notch portion 38, in a natural state in which the fixing bolt is in a posture in which the rotation locking member 13 is positioned downward, as shown by an imaginary line in FIG. Due to the difference in the height, the side having the notch 38 is raised, so that it is possible to prevent erroneous operation when the urging force is accumulated in the leaf spring 15.

  Further, the edge 35 of the rotation locking member 13 is provided with a detent projection 36, and the detent projection 36 is formed on both sides of the longitudinal intermediate position where the bolt body 12 is pivotally attached. Therefore, compared with the case where it is formed in the vicinity of the bolt body 12, the anti-rotation effect and the positioning effect are high. Moreover, even if the through hole 72 of the fixing object 71 is larger than the thickness of the bolt body 12, a sufficient anti-rotation effect can be obtained.

In correspondence between the configuration of the present invention and the above-described configuration,
The shaft portion of the present invention corresponds to the above-described shaft member,
The present invention is not limited to the above-described configuration, and other configurations can be employed.

  For example, the pivoting of the bolt body and the rotation locking member may be a pivoting structure that does not penetrate the bolt body instead of the shaft member penetrating both.

  In addition to the shape described above, the leaf spring may have, for example, an extension portion that is longer than a portion of the inner surface of the bottom plate portion corresponding to the bolt body, or a shape in which the action portion is curved.

  The leaf spring may be fixed by holding the holding portion and locking the cut-and-raised portion as described above, or by a rivet or the like.

  For example, a rod-shaped insertion support member is detachably provided at the other end of the bolt main body, that is, on the side opposite to the side having the rotation locking member, and most or all of the bolt main body is fixed to the fixing target. You may enable it to fix even if it inserts in a through-hole. The insertion support member can be made detachable by a male screw of the bolt body, a screw hole formed on the other end surface of the bolt body, or the like. If comprised in this way, the necessity of lengthening the length of a bolt main body more than necessary can be eliminated.

DESCRIPTION OF SYMBOLS 11 ... Fixing bolt 12 ... Bolt main body 13 ... Rotation locking member 14 ... Shaft member 15 ... Plate spring 21 ... Male screw 22 ... One end part 31 ... Side wall part 32 ... Bottom plate part 32a ... One end part 32b ... Other end part 35 ... Edge Part 36: Anti-rotation protrusion 38 ... Notch part 51 ... Holding part 53 ... Extension part 54 ... Action part 55 ... Buffer bending part

Claims (4)

A bolt main body having a male screw on the outer peripheral surface, and a fixing bolt including a rotation locking member formed longer than the diameter of the bolt main body and rotatable relative to the bolt main body,
The rotation locking member includes a pair of side wall portions arranged at an interval across the bolt body, and a bottom plate portion that connects the side wall portions to each other,
The pair of side wall portions are rotatably held by the shaft portion with respect to one end portion of the bolt body,
A leaf spring is held on the bottom plate portion,
The leaf spring is held at one end portion in the longitudinal direction of the bottom plate portion, and from the portion corresponding to the inner surface of the bottom plate portion in the holding portion toward the other end portion side in the longitudinal direction of the bottom plate portion. An extension portion extending along the inner surface of the bottom plate portion, and extending from the tip of the extension portion to be inclined away from the inner surface of the bottom plate portion, and the rotation locking portion rotates in one direction relative to the bolt body. A fixing bolt having an action part that comes into contact with a side surface of the bolt main body when inclined. The fixing bolt according to claim 1, wherein the extension portion extends to a portion corresponding to the bolt main body on the inner surface of the bottom plate portion, and the action portion extends linearly. The fixing bolt according to claim 1 or 2, wherein a plurality of anti-rotation protrusions are formed at an edge of the side wall portion opposite to the bottom plate portion at intervals in the longitudinal direction of the side wall portion. While having a buffer bending portion that bends toward the bottom plate portion side at the tip of the action portion,
4. The device according to claim 1, further comprising: a cutout portion for escaping the buffer bending portion at a portion corresponding to the buffer bending portion when the action portion of the bottom plate portion is arranged along the inner surface of the bottom plate portion. The fixing bolt according to one item.

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