JP2016217394A - Fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To flexibly cope with thickness fluctuation of a fastened member, in a fastening device such as a one-side bolt and the like.SOLUTION: A fastening device 1 has: a holding portion 10 disposed at a depth side in an axial direction; first and second rotary portions 15, 20 disposed at a front side in an axial direction; a power transmission portion 25 disposed between the first and second rotary portions 15, 20 and the holding portion 10 for transmitting axial force; a depth-direction seat portion 21 opposed to a depth side; a depth-side engagement portion 60 axially held between the power transmission portion 25 and the holding portion 10; and a screwing portion 30 for converting relative rotation of the first rotary portion and the second rotary portion 15, 20 into axial relative movement of the holding portion 10 and the power transmission portion 25. The power transmission portion 25 has a contraction mechanism contracting an axial length, inside of a fastened member when axial force over axial force acting in deformation or displacement of the depth-side engagement portion acts, forms a front-direction seat portion 64 by projecting radially outward of the depth-side engagement portion 60 by axial approach of the holding portion 10 and the power transmission portion 25, and is engaged with the fastened member by utilizing the front-direction seat portion 64 and the depth-direction seat portion 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fastening device that fastens a body to be fastened.

  Conventionally, a screw fastening body is used in various scenes to fasten a body to be fastened. The screw fastening body includes a male screw body (male fastening body) in which a spiral groove is formed on a columnar outer periphery, and a female screw body (female fastening body) in which a spiral groove is formed on the inner periphery of the cylindrical member. It is the structure which screwes together.

  By the way, some objects to be fastened cannot work from both sides. For example, when a screw fastening body is fastened to a hole formed in the wall surface, the work can be performed from the front side of the wall surface, but the work may not be performed from the back surface. In addition, when fastening a screw fastening body to a hole extending in and out of the circumferential surface of a long column steel or pipe steel, the work can be performed from the surface, but the work may not be performed from the inside. In such a case, a so-called one-side bolt that can realize a fastening operation including only the other side by a fastening operation only on one side of the body to be fastened is used.

  Conventional one-side bolts function as a washer on the back side by buckling the easily deformable valve sleeve inserted in the back side of the fastened body in the radial direction by crushing it in the axial direction with the core pin and grip sleeve. (See Non-Patent Document 1).

Lobtex Fastening System Co., Ltd., company web page "Home / Product catalog one → One side bolt → Hack high strength one side bolt", [online], [Search April 29, 2015], Internet <URL http: // www .lobfs.com / pages / p47.html>

  The conventional one-side bolt becomes a nut washer on the front side of the body to be fastened in order to secure a fastening distance (an additional fastening distance) to the fastened object after buckling the valve sleeve in the radial direction. A bearing washer and a shear washer are arranged, and when a desired axial force is applied, the shear washer is sheared and the front end of the grip sleeve is pulled into the bearing washer.

  Therefore, this one-side bolt can secure a fastening distance (reinforced fastening distance) with an object to be fastened by an axial distance for pulling the grip sleeve into the bearing washer, but the distance is small (for example, about 5 mm). There was a problem. Therefore, in order to make this one-side bolt compatible with fastened objects of various thicknesses, grip sleeves of various lengths are prepared, and the length of this grip sleeve is within an error range of 5 mm at maximum. It must be matched to the thickness of the object to be fastened. As a result, there is a problem that it is difficult to use the one-side bolt in an environment where the thickness of the object to be fastened cannot be determined in advance.

  Also, if this fastening distance is to be increased, it is necessary to set a large axial width of the bearing washer that defines the pull-in amount of the grip sleeve. There was a problem of getting in the way.

  In addition, the conventional one-side bolt crushes the valve sleeve into a flat state by relatively rotating the nut and the core pin that are screwed together. At this time, the core pin gradually protrudes to the front side of the fastened body. ing. Therefore, after fastening, there is a problem that the core pin protruding to the front surface becomes an obstacle.

  Further, this one-side bolt has a structure in which the axial force at the time of fastening is received by the washer (valve sleeve) because the valve sleeve is crushed to a flat state and functions as a washer. Therefore, there is a problem that the fastening is released when the washer is deformed. On the other hand, if the valve sleeve is thickened or a hard material is selected to increase the strength of the washer, there is a problem that it is difficult to buckle in the axial direction.

  The present invention has been made by the inventor's diligent research in view of the above-described problems, and an object thereof is to provide a fastening device that can flexibly cope with a thickness variation of an object to be fastened.

  The present invention that achieves the above-described object includes a sandwiching portion that is disposed on the back side in the axial direction, a first rotating portion and a second rotating portion that are disposed on the near side in the axial direction and are capable of rotating relative to each other, At least one of the first rotation unit and the second rotation unit, the power transmission unit disposed between the first rotation unit and the second rotation unit, and the clamping unit and transmitting axial force, and the first rotation unit and the second rotation unit A back-facing seat portion that is formed and faces the back side, a back-side engaging portion that is held in the axial direction between the power transmission portion and the holding portion, the first turning portion, and the second turning portion A screwing portion that converts the relative rotation of the holding portion and the power transmission portion in the axial direction, and the power transmission portion deforms or displaces the back side engagement portion. When an axial force exceeding the acting axial force is applied, it has a contraction mechanism in which the length in the axial direction contracts inside the fastened member, and the clamping portion and the power transmission portion are approached in the axial direction. By doing so, the back side engaging part is deformed or displaced, thereby forming a forward facing seat part that protrudes radially outward from the sandwiching part and the power transmission part and faces the near side. A fastening device that engages with a member to be fastened using a seat portion and the back-facing seat portion.

  In relation to the fastening device, the power transmission section includes a first power transmission piece located on the back side and a second power transmission piece located on the near side, the first power transmission piece and the second power transmission piece. The length of the power transmission portion in the axial direction contracts by sliding the power transmission piece in the axial direction.

  In relation to the fastening device, the first power transmission piece and the second power transmission piece are inserted into a fastened member.

  In connection with the fastening device, a shearing portion is disposed between the first power transmission piece and the second power transmission piece, and the first power transmission piece and the second power transmission piece are pivoted by the shearing portion. The first power transmission piece and the second power transmission are engaged with each other by being sheared by an axial force that exceeds the axial force acting when the rear engagement portion is deformed or displaced. The force piece slides in the axial direction.

  In relation to the fastening device, the power transmission part is constituted by a member that is extendable in the axial direction.

  In relation to the fastening device, the power transmission part is constituted by a cylindrical member having a plurality of notches extending in a direction perpendicular to the axis.

  In relation to the fastening device, the power transmission section is constituted by a member that is elastically deformable in the axial direction.

  In relation to the fastening device, the power transmission portion, the back side engagement portion, and the clamping portion are configured to engage with each other in the circumferential direction so as to be freely rotatable.

  In relation to the fastening device, the power transmission unit, the back side engagement unit, and the clamping unit are integrally configured.

  In relation to the fastening device, the shaft includes a shaft portion extending in the axial direction that can be rotated with the first rotating portion and has a male screw portion, and the clamping portion has a female screw portion that is screwed with the male screw portion. The second rotating part and the power transmission part can be rotated, and the clamping part and the power transmission part are rotated between the clamping part and the power transmission part, It is provided with the interlocking mechanism which moves a clamping part and the said power transmission part relatively to an axial direction, It is characterized by the above-mentioned.

  In relation to the fastening device, the back side engaging portion has the front facing seat portion facing the front side before being deformed or displaced, and the clamping portion and the power transmitting portion are By approaching, the forward-facing seat portion moves radially outward, and the forward-facing seat portion protrudes outward in the radial direction from the sandwiching portion and the power transmission portion.

  In relation to the fastening device, the power transmission part is configured by using a plurality of minute surfaces of at least one of a substantially triangular shape, a substantially parallelogram shape, a substantially trapezoidal shape, and a substantially hexagonal shape, and has a predetermined axial direction or more. It is characterized in that it can be contracted in the axial direction by inputting a compressive force.

  According to the present invention, it is possible to reduce the amount of protrusion to the front side after fastening.

In the fastening device which concerns on 1st embodiment of this invention, (A) The top view of the back side engaging part in a diameter-reduced state, (B) The whole front fragmentary sectional view in a diameter-reduced state, (C) In a diameter-expanded state FIG. 1B is a plan view of the rear engagement portion, FIG. 1D is an overall front partial cross-sectional view in the expanded diameter state, FIG. 1E is a cross-sectional view taken along the line E-E in FIG. It is FF arrow sectional drawing. It is the whole front fragmentary sectional view in the diameter-expanded state after the fastening of the fastening device. (A) a plan view of the back side engaging portion in the reduced diameter state, (B) a front partial sectional view in the vicinity of the back side engaging portion in the reduced diameter state, and (C) in the expanded diameter state according to a modification of the fastening device. It is a top view of a back side engaging part, (D) The front fragmentary sectional view of the back side engaging part vicinity in a diameter-expanded state. (A) a plan view of the back side engaging portion in the reduced diameter state, (B) a front partial sectional view in the vicinity of the back side engaging portion in the reduced diameter state, and (C) in the expanded diameter state according to a modification of the fastening device. It is a top view of a back side engaging part, (D) The front fragmentary sectional view of the back side engaging part vicinity in a diameter-expanded state. (A) a plan view of a back side engaging portion in a reduced diameter state according to a modification of the fastening device, (B) a cross-sectional plan view of the back side engaging portion in a reduced diameter state as seen from the arrow BB in FIG. (C) Front sectional view taken along line CC of (A) in the vicinity of the back side engaging portion in the reduced diameter state, (D) DD arrow in (A) near the back side engaging portion in the reduced diameter state. (E) Plan view of the back side engaging portion in the expanded diameter state, (F) Plan view of the back side engaging portion in the expanded diameter state, taken along the line FF of (G), (G) ) GG arrow front partial cross-sectional view in the vicinity of the back side engaging portion in the expanded diameter state, (H) HH arrow front view in the vicinity of the back side engaging portion in the expanded diameter state. It is a fragmentary sectional view. It is the front partial sectional view of the back side engaging part vicinity in the (A) diameter-reduced state which concerns on the modification of the fastening device, (B) The front partial sectional view of the back side engaging part vicinity in the diameter-expanded state. It is the front partial sectional view of the back side engaging part vicinity in the (A) diameter-reduced state which concerns on the modification of the fastening device, (B) The front partial sectional view of the back side engaging part vicinity in the diameter-expanded state. It is the front partial sectional view of the back side engaging part vicinity in the (A) diameter-reduced state which concerns on the modification of the fastening device, (B) The front partial sectional view of the back side engaging part vicinity in the diameter-expanded state. It is the whole front fragmentary sectional view in the (A) diameter-reduction state which concerns on the modification of the fastening device, (B) The whole front fragmentary sectional view in the diameter-expansion state. It is the whole front fragmentary sectional view in the (A) diameter-reduction state which concerns on the modification of the fastening device, (B) The whole front fragmentary sectional view in the diameter-expansion state. (A) is an overall front partial cross-sectional view and bottom view in which the right half is in a reduced diameter state and the left half is in an enlarged diameter state according to the fastening device of the second embodiment of the present invention, and (B) is the fastening It is the whole front fragmentary sectional view and bottom view in which the right half is a diameter-reduced state and the left half is a diameter-expanded state, according to a modification of the device. (A) is a front fragmentary sectional view of a clamping part, a back side engaging part, and a power transmission part according to the fastening device, and (B) is a clamping part, a back side engaging part and a modification according to a modification of the fastening device. The front view of a power transmission part, and BB arrow sectional drawing of a front view, (C) is the front view of a clamping part, a back side engaging part, and a power transmission part which concerns on the modification of the fastening device, and a front It is CC sectional view taken on the line of the figure. (A) is a front view of a clamping part, a back side engaging part, and a power transmission part according to a modification of the fastening device, and a cross-sectional view taken along the line AA in the front view, and (B) is a modification of the fastening device. It is the front view of a clamping part, a back side engaging part, and a power transmission part which concerns on an example, and BB arrow sectional drawing of a front view. It is AA arrow sectional drawing of the front view, side view, and front view of a clamping part, a back side engaging part, and a power transmission part which concern on the modification of the fastening device. It is the front view in the middle of the production process of the clamping part, back side engagement part, and power transmission part which concerns on the modification of the fastening device, the front view after completion of production, and the AA arrow sectional view of the front view. (A) Whole front partial sectional view in a reduced diameter state according to a modification of the fastening device, (B) Front sectional view showing only a modification of the power transmission part, (C) Only a modification of the power transmission part is shown. It is front sectional drawing. (A)-(C) Front sectional view showing only power transmission part, (D) Top view, front sectional view and XX arrow plane sectional view showing only power transmission part, according to modification of same fastening device (E) It is the top view which shows only a power transmission part, a front view, and a right view. It is the front partial sectional view of the back side engaging part vicinity in the (A) diameter-reduced state which concerns on the modification of the fastening device, (B) The front partial sectional view of the back side engaging part vicinity in the diameter-expanded state. It is the front view in a diameter-reduced state which concerns on the modification of the fastening device, (B) The rear view in a diameter-reduced state, (C) The side view in a diameter-reduced state. It is a perspective view in the diameter-reduced state which concerns on the modification of the fastening device. It is the (A) front view in the diameter-expanded state which concerns on the modification of the fastening device, (B) The rear view in the diameter-expanded state, (C) The side view in the diameter-expanded state. It is a perspective view in the diameter-expanded state which concerns on the modification of the fastening device. It is the (A) perspective view which shows the components of the back side engaging part which concerns on the modification of the fastening device, (B) Top view or bottom view, (C) Side view. It is the front view in a diameter-reduced state which concerns on the modification of the fastening device, (B) The rear view in a diameter-reduced state, (C) The side surface partial sectional view in a diameter-reduced state. It is a perspective view in the diameter-reduced state which concerns on the modification of the fastening device. They are (A) the front view in the diameter-expanded state which concerns on the modification of the fastening device, (B) the rear view in the diameter-expanded state, and (C) the side surface partial sectional view in the diameter-expanded state. It is a perspective view in the diameter-expanded state which concerns on the modification of the fastening device. It is (A) sectional perspective view, (B) perspective view, (C) front view, (D) front sectional view, and (E) bottom view which show the clamping part concerning the modification of the fastening device. (A) perspective view, (B) side view, (C) front view or back view, (D) top view or bottom view, showing parts of the back side engaging portion according to a modification of the fastening device, (E) It is a rear view or a front view. It is (A) top view, (B) side view, (C) front view, (D) perspective view which shows the power transmission part which concerns on the modification of the fastening device. It is the front partial sectional view of the back side engaging part vicinity in the (A) diameter-reduced state which concerns on the modification of the fastening device, (B) The front partial sectional view of the back side engaging part vicinity in the diameter-expanded state. It is (A) perspective view which shows the PCCP shell structure which concerns on the modification of the fastening device, (B) Front view, (C) Top view, (D) Perspective which shows the expansion-contraction tube structure which concerns on the modification of the fastening device (E) Front view, (F) Top view, (G) Perspective view showing these contracted states, (H) to (L) Perspective views of a power transmission unit and the like to which these structures are applied It is. (A) thru | or (C) and (E) are front sectional views showing the 2nd rotation part concerning the modification of the fastening device, the power transmission part, the back side engagement part, and the clamping part, (D ) Is a perspective view of the same portion, and (F) is a perspective view according to a modification of the fastening device.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a fastening device 1 according to the first embodiment. The fastening device 1 includes a shaft portion 5 that extends in the axial direction, a clamping portion 10 that is disposed on the back side in the axial direction of the shaft portion 5, and a first rotating portion 15 that is disposed on the front side in the axial direction of the shaft portion 5. The second rotating unit 20 disposed on the near side and relatively rotated with the first rotating unit 15 and the power transmitting unit disposed on the clamping unit 10 side with respect to the second rotating unit 20 and transmitting axial force 25, and a rear side engaging portion 60 that is clamped in the axial direction between the power transmission portion 25 and the clamping portion 10. In addition, although the case where these components or members are comprised with a metal is illustrated in this 1st embodiment, you may comprise with members other than a metal, and you may comprise combining different materials.

  The first rotation unit 15 is engaged with a tightening tool (not shown) and receives a turning force. For example, in order to engage with the spanner, the outer shape of the first rotating portion 15 is hexagonal, polygonal including convex and concave, or the like. In order to engage with a tightening tool such as a hexagonal wrench, a hole having a shape corresponding to the tightening tool such as a hexagonal hole or a hexagonal wrench is formed on the end surface of the first rotating portion 15. That's fine.

  The second rotating unit 20 is engaged with a tightening tool (not shown) and receives a turning force. There are various methods for engaging with the tightening tool. For example, in order to engage with the spanner, the outer shape of the second rotating portion 20 may be a hexagon.

  The first rotation unit 15 and the second rotation unit 20 rotate relative to each other and engage in the axial direction. In the present embodiment, the front side end face 22 of the second rotating portion 20 and the back seat portion 16 of the first rotating portion 15 are engaged in the axial direction.

  Here, the first rotating portion 15 is integrally provided at the front end portion of the shaft portion 5. Accordingly, the first turning portion 15 and the shaft portion 5 are rotated.

  The shaft portion 5 is a columnar member (it is not necessarily a columnar shape and may be a columnar member), and acts on the sandwiching portion 10, the screwing portion 30, the first rotating portion 15, and the like. Transmits axial force. In addition, in this embodiment, the axial part 5 transmits axial force between the clamping part 10 and the screwing part 30 (it mentions later for details) formed in itself. The shaft portion 5 is set longer than the thickness of the fastened member H.

  The clamping part 10 is integrally and coaxially provided at the back end part of the shaft part 5.

  The sandwiching portion 10 is a member having an outer shape larger than the diameter of the shaft portion 5, that is, a member that protrudes outward in the radial direction with respect to the shaft portion 5. Specifically, in the present embodiment, the outer shape of the clamping unit 10 is a column, a cylinder, or a cone.

  The clamping part 10 protrudes radially outward with respect to the shaft part 5, thereby forming a receiving part 11 facing the front side. Here, although the receiving part 11 is a conical taper surface, it may be a plane perpendicular to the axial direction.

  A screwing portion 30 is formed between the shaft portion 5 and the clamping portion 10. Specifically, the screw part 30 includes an internal thread part 31 formed on the inner periphery of the clamping part 10 and an external thread part 32 formed on the outer periphery at least on the back side of the shaft part 5 and screwed with the internal thread part 31. It is prepared for. Therefore, the clamping part 10 becomes a cylindrical internal thread body, and the axial part 5 becomes an external thread body.

  The 2nd rotation part 20 has the back direction seat part 21 which opposes a back side (the back side engaging part 60 side). The back-facing seat portion 21 engages with the near-side end surface 27 of the power transmission portion 25 in the axial direction and abuts with the near-side surface of the fastened member H. Note that the back-facing seat portion 21 may be in contact with a washer (not shown), and may be engaged with the power transmission portion 25 and the fastened member H in the axial direction via this washer.

  Between the clamping part 10 and the power transmission part 25, while the clamping part 10 and the power transmission part 25 are rotated, the interlocking mechanism 90 which relatively moves this clamping part 10 and the power transmission part 25 to an axial direction is comprised. . The interlocking mechanism 90 includes an interlocking sleeve 92 that is provided in the sandwiching portion 10 and extends in the axial direction on the inner side of the back side engaging portion 60, and a sleeve accommodation hole 94 that is provided in the power transmission portion 25 and accommodates the interlocking sleeve 92. Have. As shown in FIG. 1E, grooves or line-shaped protrusions extending in the axial direction and engaging with each other in the circumferential direction are formed in the circumferential direction on the outer circumferential surface of the interlocking sleeve 92 and the inner circumferential surface of the sleeve receiving hole 94. More than one series, preferably a plurality are formed. Therefore, the interlocking sleeve 92 and the sleeve receiving hole 94 are slidable in the axial direction and engage in the circumferential direction. Although not particularly shown here, it is also possible to form the sleeve accommodation hole 94 in the back side engaging portion 60 and form the interlocking sleeve 92 in the power transmission portion 25.

  The 2nd rotation part 20 rotates together by integrating with the power transmission part 25. FIG. Therefore, when the second rotation unit 20 is rotated, the clamping unit 10 is rotated via the power transmission unit 25 and the interlocking mechanism 90.

  When the first and second rotating portions 15 and 20 are relatively rotated, the relative rotation is converted into relative movement in the axial direction of the sandwiching portion 10 and the power transmitting portion 25 by the screwing portion 30.

  Here, the transmission portion 25 is a substantially cylindrical sleeve member, and the shaft portion 5 is inserted therein. The length of the power transmission part 25 is set to be equal to or greater than the thickness of the fastened member H and is set to be shorter than the shaft part 5. The power transmission unit 25 is disposed between the second rotation unit 20 and the back side engagement unit 60 and transmits an axial force like a so-called refilling rod. Although the case where the 2nd rotation part 20 and the power transmission part 25 are integrated is illustrated here, both may be separate.

  The maximum outer diameter of the power transmission part 25, the maximum outer diameter of the clamping part 10, and the maximum outer diameter of the rear side engaging part 60 before the diameter expansion are set so as to match or approximate. This is because it is necessary to insert all of these into the hole HP of the fastened member H from the front side.

  The power transmission unit 25 employs a contraction structure whose length can be contracted inside the hole HP of the fastened member H. As the contraction / shrinkage structure, for example, a cylindrical first power transmission piece 28A located on the back side and a cylindrical second power transmission piece 28B located on the near side are provided, and the first power transmission piece 28A and The second power transmission piece 28B is engaged in the circumferential direction while sliding in the axial direction. At this time, the inner diameter of the second power transmission piece 28B is set larger than the outer diameter of the first power transmission piece 28A, and the second power transmission piece 28B enters the outside of the first power transmission piece 28A. The entire length of the force portion 25 is contracted. As shown in FIG. 1 (F), between the outer periphery of the first power transmission piece 28A and the inner periphery of the second power transmission piece 28B, there are grooves or row projections that extend in the axial direction and engage with each other in the circumferential direction. By forming a plurality in the circumferential direction, the rotation of the second rotation unit 20 can be transmitted to the clamping unit 10.

  The shearing part (shear washer) 29 is fixed to the outer periphery of the first power transmission piece 28 </ b> A. When the power transmission part 25 is the longest, the rear end of the second power transmission piece 28 </ b> B contacts the shearing part 29. Touch. As shown in FIG. 1 (B), after the clamping unit 10 is moved to the near side and the rear side engagement unit 60 is expanded in diameter, an external force is further applied so as to further contract the power transmission unit 25 in the axial direction. Then, as shown in FIG. 2, the shearing portion 29 is sheared, the second power transmission piece 28B enters the outside of the first power transmission piece 28A, and the total length of the power transmission portion 25 is shortened. Particularly in this example, both the first power transmission piece 28A and the second power transmission piece 28B are set to have an outer diameter smaller than the hole HP of the fastened member H, and both are inserted into the hole HP. Further, the outer diameter of the shearing portion 29 is also set smaller than the hole HP (or set to be equal to or smaller than the maximum outer diameter of the power transmission portion 25), and is arranged near the center of the power transmission portion 25 in the axial direction. Sometimes it is located in the hole HP.

  The axial force when the shearing portion 29 shears is set to be larger than the axial force required when the rear side engaging portion 60 expands in diameter. That is, until the rear side engaging portion 60 is expanded in diameter, the transmission portion 25 is not contracted in the axial direction, only the clamping portion 10 is slid in the axial direction, and a larger axial force (that is, When an axial force at the time of fastening) is applied, the shearing portion 29 is actively broken and the power transmission portion 25 is contracted.

  The back side engaging part 60 is an annular member, and is a front side seating part 64 facing the front side in the axial direction, and a back side engaging part facing the back side in the axial direction and the receiving part 11 of the clamping part 10. It has a mating surface 66.

  In the rear side engaging portion 60, the front-facing seat portion 64 moves radially outward when the sandwiching portion 10 approaches the power transmission portion 25 in the axial direction, and the front-facing seat portion 64 is moved to the sandwiching portion 10. And projecting radially outward from the power transmission portion 25. Therefore, as shown in FIG. 1C, when the back side engaging portion 60 is viewed from the whole, the diameter is increased.

  As a result, the fastening device 1 can be fastened to the fastened member H using the front-facing seat portion 64 of the sandwiching portion 10 and the back-facing seat portion 21 of the second rotating portion 20. In addition, although the case where the front facing seat portion 64 and the back facing seat portion 21 are brought into direct contact with the fastened member H and fastened is illustrated, the present invention is fastened indirectly through a washer or the like. Including cases.

  The back side engaging portion 60 will be described in more detail.

  The back side engagement surface 66 is a tapered surface inclined with respect to the direction perpendicular to the axis. Accordingly, the axial force is converted into an expanding force toward the outside in the radial direction by pressing the receiving portion 11 and the back engagement surface 66 that are also tapered surfaces in the axial direction.

  The front-facing seat portion 64 abuts on the back end surface 26 on the back side in the axial direction of the power transmission portion 25. The front-facing seat portion 64 moves radially outward while sliding with respect to the back-side end surface 26.

  As a result, when the back side engaging surface 66 slides radially outward with respect to the receiving part 11, the front-facing seat part 64 slides radially outward with respect to the back side end face 26 in conjunction therewith. When both the back-side engaging surface 66 and the front-facing seat portion 64 move outward in the radial direction, they protrude outward in the radial direction from the sandwiching portion 10 and the power transmission portion 25. Since the back side engaging part 60 does not incline at the time of diameter expansion, it can be moved parallel to the outside in the radial direction without changing the axial dimension.

  As shown in FIG. 1A, a plurality of (three in this case) rear side engaging portions 60 are arranged in the circumferential direction, and each has a front facing seat portion 64 and a rear side engaging surface 66. The engagement piece 62 and the protrusion restricting portion 70 that defines a movement limit when the front-facing seat portion 64 moves radially outward are provided.

  The back side engagement piece 62 is a member having a partial arc shape when seen in a plan view, and a plurality of the rear side engagement pieces 62 are arranged in the circumferential direction so as to be substantially cylindrical except for the location of the continuous ring portion 72.

  The protrusion restricting portion 70 serves as a connecting portion 72 that connects the plurality of back side engaging pieces 62 in the circumferential direction. The link portion 72 is a member that can be easily deformed, and the dimension in the link direction, that is, the dimension (distance) in the circumferential direction is variable. Moreover, the upper limit is set to the circumferential direction dimension of the continuous ring part 72, and when the upper limit is reached, the distance does not further increase.

  Specifically, the connecting portion 72 is a thin-walled member that is folded in the circumferential direction by bending so as to reciprocate in the radial direction when the rear side engaging portion 60 in FIG. . Moreover, the continuous ring part 72 connects the outer peripheral side vicinity of the back side engaging part 60 mutually, and is bent toward the radial inside. Therefore, as shown in FIG. 1 (C), when the continuous ring portion 72 is elastically or plastically deformed in the circumferential direction until the upper limit is reached, the distance between the back side engaging pieces 62 adjacent in the circumferential direction increases, The side engaging piece 62 translates radially outward while maintaining the axial direction. When the continuous ring portion 72 is fully extended, the movement of the back side engagement piece 62 stops.

  As shown in FIG. 1 (D), when the first and second rotating portions 15 and 20 are relatively rotated and the fastened member H is fastened, the reaction force is a front facing seat of the back side engaging piece 62. It is transmitted to the receiving part 11 of the clamping part 10 via the part 64. As a result, each of the rear side engaging pieces 62 tries to move further outward in the radial direction, but further movement is restricted by the tension of the continuous ring portion 72, and the reaction force can be received.

  In the present embodiment, the case where the thin-walled continuous portion 72 is bent in the radial direction is exemplified in the plan view, but the thin-walled continuous portion 72 is bent in the axial direction and folded in the circumferential direction. You can also.

  According to the fastening device 1 of the present embodiment, the distance (shrinkage distance) M between which the first power transmission piece 28A and the second power transmission piece 28B slide is preferably a quarter of the total length of the power transmission section 25, preferably Can be reduced to one third or more. As a result, the single fastening device 1 can flexibly cope with the thickness variation of the fastened member H. Specifically, the variation allowable amount Ex of the thickness E of the member to be fastened can be 0.2 L or more with respect to the total axial length L of the fastening device 1, preferably 0.3 L or more, and more desirably. Can be 0.4 L or more. In addition, the maximum value that can be selected by the thickness E at this time can be 0.7 L or more, and more desirably 0.8 L or more. In other words, it is possible to flexibly cope with the thickness variation of the fastened member H while the entire length of the fastening device 1 is configured to be compact.

  Furthermore, according to the fastening device 1 of the present embodiment, when the first rotating portion 15 and the second rotating portion 20 are relatively rotated in the reduced diameter state of FIGS. The shaft portion 5 rotates together with the portion 15, and the clamping portion 10 rotates together with the second rotation portion 20. As a result, as shown in FIGS. 1C and 1D, the clamping portion 10 is moved to the near side by the screwing portion 30 between the shaft portion 5 and the clamping portion 10, and the back side engaging portion 60 is moved. The diameter can be increased. Therefore, even after the fastening, the shaft portion 5 does not protrude toward the front side, so that it does not get in the way.

  Further, unlike the conventional valve sleeve (corresponding to the back side engaging portion), it is not necessary to buckle the back side engaging portion 60 in the axial direction. Can be thick. Further, since the forward facing seat portion 64 of the back side engagement piece 62 can be moved as it is in the radial direction and the reaction force of the fastened member H can be received by the forward facing seat portion 64, the rigidity is enhanced. The fastening force can be increased.

  In particular, in the back side engaging part 60 of this embodiment, since the back side engaging piece 62 side is not elastically or plastically deformed by exclusively arranging the continuous ring part 72 that is deformed when the diameter is expanded, the wall thickness is further increased. Design becomes possible. Since the connecting portion 72 can be easily deformed, the burden on the operator when fastening is reduced.

  Further, if the continuous ring portion 72 is an elastic member that can be restored after deformation, it is possible to return to the reduced diameter state by separating the clamping portion 10 and the power transmission portion 55 after fastening, and the fastening device 1 It can be easily taken out from the fastened body H.

  Although the back side engaging part 60 of the said embodiment illustrated the case where the back side engaging piece 62 and the protrusion control part 70 (continuous ring part 72) were formed integrally, this invention is not limited to this, For example, As shown in FIG. 3, it is possible to combine different members. In this case, the rear engagement piece 62 may be made of a metal material whose surface hardness is increased by quenching or the like, and the continuous ring portion 72 may be made of a normal metal material or a metal material that can be easily elastically deformed. Of course, resin materials other than metals may be combined.

  Although the back side engaging part 60 of the said embodiment illustrated the case where three back side engaging pieces 62 are arrange | positioned, the number is not specifically limited, For example, as shown in FIG. You may arrange | position above. Two may be sufficient. Moreover, although the continuous ring part 72 of the back side engaging part 60 of the said embodiment illustrated the case where the outer peripheral side vicinity of the back side engaging part 60 was mutually connected, as shown in FIG. It is also preferable that the vicinity of the inner peripheral side of the side engaging portion 60 is connected to each other and bent outward in the radial direction. If it does in this way, the movement distance to the radial direction outer side engagement piece 62 by expansion | extension of the continuous ring part 72 can be enlarged.

  The back side engaging part 60 of the said embodiment illustrates the case where it is comprised so that the front facing seat part 64 and the back side engaging surface 66 of the back side engaging piece 62 may not exist in the place where the continuous ring part 72 exists. However, the present invention is not limited to this. For example, as shown in FIG. 5, in the back side engaging piece 62, the vicinity of the front-facing seat portion 64 and / or the back side engaging surface 66 can be expanded in the circumferential direction. That is, you may arrange | position so that the continuous ring part 72 and the front facing seat part 64 and / or the back side engaging surface 66 may overlap in an axial direction. If it does in this way, it will become possible to enlarge the area of the front facing seat part 64 and / or the back side engaging surface 66.

  The fastening device 1 of the above embodiment has a structure that receives the reaction force of the fastened member H by the tapered surfaces of the receiving portion 11 and the back-side engagement surface 66 in the diameter-expanded state of FIGS. 1 (C) and 1 (D). Although illustrated, this invention is not limited to this. For example, as shown in FIG. 6, the receiving part 11 is a first receiving part 11 a that is a tapered surface on the inner peripheral side, and a second that is disposed on the outer peripheral side of the first receiving part 11 a and is a flat surface that extends in the direction perpendicular to the axis. A two-stage structure including the receiving portion 11b is adopted. Moreover, the back side engaging surface 66 is a first back side engaging surface 66a that is a tapered surface on the outer peripheral side, and a plane that is disposed on the inner peripheral side of the first back side engaging surface 66a and extends in the direction perpendicular to the axis. A two-stage structure including a second back side engagement surface 66b. In this way, when the diameter is reduced in FIG. 6A, the first receiving portion 11a and the first back-side engagement surface 66a come into contact with each other, and the axial force is converted into the expansion force by the taper structure to engage the back-side. The diameter of the part 60 is expanded. At the end of the diameter expansion, as shown in FIG. 6B, the contact between the first receiving portion 11a and the first back side engagement surface 66a is released, and the second receiving portion 11b and the second back side engagement are released. The surface 66b abuts to complete the movement of the back side engagement piece 62 in the radial direction. Therefore, the second receiving portion 11b and the second back side engaging surface 66b can be defined as a part of the protrusion restricting portion 70 in the present invention.

  Further, the second receiving portion 11b and the second back side engaging surface 66b can receive the axial reaction force from the fastened member H on a vertical plane. At the same time, since the tension acting on the continuous ring portion 72 can be reduced or released in the expanded diameter state, fatigue of the continuous ring portion 72 can be suppressed. In addition, although the case where the receiving part 11 and the back side engaging surface 66 are made into a two-step structure was illustrated here, for example, when making the back side end surface 26 and the front facing seat part 64 into a taper structure, this is made into two steps. A structure is also possible.

  Further, as shown in FIG. 7, step portions 11 c and 66 c that are engaged with each other in the radial direction when the diameter expansion operation is completed (in the diameter expansion state) can be formed on the receiving portion 11 and the back side engagement surface 66. . Similarly, the back end face 26 and the forward facing seat portion 64 can be formed with step portions 26c and 64c that are engaged with each other in the radial direction when the diameter expansion operation is completed. Since these step portions can restrict the movement of the back side engagement piece 62 in the radial direction, these step portions can also be defined as a part of the protrusion restricting portion 70 in the present invention. .

  In the present embodiment, the front-facing seat portion 64 and the back-side end surface 26 are configured as a plane parallel to the direction perpendicular to the axis, but the present invention is not limited to this. For example, as shown in FIG. 8, it is also preferable to convert the axial pressing force into an expansion force that moves the front-facing seat portion 64 radially outward by using the front-facing seat portion 64 and the back end surface 26 as tapered surfaces. .

  In the present embodiment, the case where the front-facing seat portion 64 and a part of the back end surface 26 abut each other in the expanded diameter state of FIGS. 1C and 1D is illustrated, but the present invention is not limited to this. . For example, as shown in FIG. 9B, in the diameter-expanded state, the contact between the front-facing seat portion 64 and the back side end surface 26 is released, and the back side end surface 26 of the power transmission unit 25 is connected to the back side. It is also preferable to enter the inner peripheral side of the joint portion 60. In this way, the fastening amount (tightening amount) by the back side engaging portion 60 and the second rotating portion 20 can be increased by a distance T that allows the power transmission portion 25 to enter the back side engaging portion 60. Thus, it becomes possible to flexibly cope with a change in the thickness of the fastened member H.

  In addition, in the said embodiment, the screwing part 30 is arrange | positioned between the axial part 5 and the clamping part 10, and the clamping part 10 moves to the near side and illustrates the case where the back side engaging part 60 is expanded in diameter. However, the present invention is not limited to this.

  For example, as shown in FIG. 10A, a male screw part 32 is arranged on the front side of the shaft part 5 to form a female screw body, a second rotating part 20 is used as a nut, and a female screw part 31 is arranged on the inner peripheral surface. The screwing portion 30 can be configured by screwing the male screw portion 32 and the female screw portion 31 together.

  In this case, the first rotating unit 15, the shaft unit 5, and the holding unit 30 are integrally configured, and the second rotating unit 20 and the first rotating unit 15 are relatively rotated, whereby the holding unit 30. And the power transmission part 25 can be made to approach to an axial direction, and the back side engaging part 60 can be expanded in diameter (refer FIG.10 (B)). In addition, although the 2nd rotation part 20 and the power transmission part 25 are comprised separately from here, you may integrate.

  After the rear side engaging part 60 has expanded in diameter, when the second rotating part 20 and the first rotating part 15 are further rotated relative to each other and the clamping part 30 is moved to the near side, the shearing part of the power transmission part 25 29 is sheared, the second power transmission piece 28B enters the first power transmission piece 28A, and the total length of the power transmission portion 25 is shortened.

  Next, with reference to FIG. 11, the fastening device 1 which concerns on 2nd embodiment is demonstrated. In addition, about what has a function in common with the components, members, etc. of the fastening device shown in the first embodiment, the description and illustration are appropriately omitted by matching the names and / or symbols in the second embodiment, The differences are mainly explained.

  As shown in FIG. 11A, in the fastening device 1, the second rotating unit 20, the power transmission unit 25, the back side engaging unit 60, and the clamping unit 10 are integrally configured in the axial direction. Therefore, the turning force applied from the outside to the second rotating unit 20 can be transmitted to the clamping unit 10. In addition, the 2nd rotation part 20, the power transmission part 25, the back side engaging part 60, and the clamping part 10 can also be comprised, for example by injection-molding a resin material, and also cuts a metal material. Or by press molding, or by molding a metal or other powder material.

  The back side engaging portion 60 is a deformable sleeve that approaches the outer peripheral surface of the shaft portion 5 and can be easily buckled outward in the radial direction. The thickness of the deformation sleeve in the radial direction is smaller than the thickness of the sandwiching portion 10 and / or the power transmission portion 25. Therefore, as shown in the left half of FIG. 11 (A), when the first turning portion 15 and the second turning portion 20 are relatively rotated to bring the clamping portion 10 and the power transmission portion 25 closer to each other, The joint portion 60 buckles and deforms outward in the radial direction to form a so-called washer having a front-facing seat portion 64.

  Although not shown in FIG. 11, the power transmission unit 25 employs a contraction structure that can contract in the axial direction. This will be described later.

  In addition, while the back side engaging part 60 of this embodiment is comprised integrally between the clamping part 10 and the power transmission part 25, while being able to rotate the clamping part 10 and the power transmission part 25, a clamping part 25 and the power transmission unit 25 also serve as an interlocking mechanism that relatively moves in the axial direction.

  The back side engaging portion 60 is located at the boundary between the center buckling region 68C located at the center in the axial direction, the near side buckling region 68A located at the boundary with the power transmission portion 25, and the clamping portion 30. The buckling region 68B is made of a soft material, a thin-walled material, or a fragile material, and a portion where the front-facing seat portion 64 is formed after the buckling is completed, that is, a non-buckling region 67A on both outer sides in the axial direction of the central buckling region 68C. 67B is preferably a hard material, a thick material, or a highly rigid material. This is because the strength or rigidity after the deformation can be increased while facilitating the deformation.

  When these are made of a metal material, for example, at least a part (or all in some cases) of the center buckling region 68C, the front side buckling region 68A, and the back side buckling region 68B is made of a metal raw material, and is not buckled. At least a part (or all in some cases) of the regions 67A and 67B may be hardened steel.

  In addition, in FIG. 11 (A), although the case where the back side engaging part 60 approaches the outer peripheral surface of the axial part 5 was illustrated, this invention is not limited to this. For example, as shown in FIG. 11 (B), the rear side engaging portion 60 is disposed at a position where a clearance is formed in the radial direction from the shaft portion 5 within a range where buckling is possible by the sandwiching portion 10 and the power transmission portion 25. May be.

  Next, the axial contraction structure of the power transmission unit 25 will be described. For example, as shown in FIG. 12 (A), it is preferable that the power transmission portion 25 is formed in a so-called bellows shape and is expanded and contracted in the axial direction. The load at the time of expansion / contraction of the power transmission portion 25 is set to be larger than the buckling load in the axial direction of the back side engagement portion 60. In this way, after the buckling of the back side engaging portion 60 is completed, when the clamping portion 10 and the power transmission portion 25 are brought closer to each other with a stronger force, the power transmission portion 25 contracts and the fastened member H It is possible to engage in the axial direction.

  As another example, as shown in FIG. 12 (B), the power transmission portion 25 has a V-shaped first slit 226A and first slits 226A and 180 in a side view from the radially outer side to the inner side with respect to the cylindrical member. It is also preferable to form the second slits 226B having a phase difference of degrees alternately in the axial direction. In this way, when the power transmission unit 25 is viewed from the side, the first and second slits 226A and 226B form a so-called jagged shape (zigzag) having a gap in the axial direction. It becomes possible to contract in the direction.

  The phase and number of the slits are not particularly limited. As shown in FIG. 12C, the first slit 226A having a V-shape in a side view from the radially outer side toward the inner side with respect to the cylindrical member, A second slit 226B having a phase difference of 180 degrees from one slit 226A, a first slit 226A, 226B, a third slit 226C having a phase difference of 90 degrees, and a third slit 226C having a phase difference of 180 degrees. A fourth slit 226D serving as a phase difference may be formed. The first and second slits 226A, 226B are in the same position in the axial direction, and the third and fourth slits 226C, 226D are in the same position in the axial direction, but with respect to the first and second slits 226A, 226B Placed at a position shifted in the axial direction. Even in this case, it is possible to contract in the axial direction by the gap formed in the axial direction.

  Furthermore, the shape of the slit is not particularly limited. 13A, which is an application of FIG. 12B, includes first and second slits 226A and 226B having a parallel shape that are parallel to the direction perpendicular to the axis and form a gap in the axial direction. Have. 13B, which is an application of FIG. 12C, and first to fourth slits 226A, 226B, 226C, and 226D having parallel shapes. Also in these cases, it is possible to contract in the axial direction by the gap formed in the axial direction in the power transmission unit 25.

  Furthermore, the depth (depth) of the slit is not particularly limited. For example, like the power transmission unit 25 shown in FIG. 14 which is an application of FIG. 13A, the innermost portions (re-rear surfaces) of the first and second slits 226A and 226B are opposite in phase to the opening side of the slit. It is good also as a shape where the innermost part extends in the radial direction so as to wrap around the (180 degree phase difference) side. If it does in this way, the rigidity of power transmission part 25 will fall and it can contract flexibly in the direction of an axis.

  Furthermore, like the power transmission portion 25 shown in FIG. 15 which is an application of FIG. 13B, the first to fourth slits 226A, 226B, 226C having parallel shapes that form minute axial gaps with respect to the tubular member, After forming 226D (see FIG. 15A), the first to fourth slits 226A, 226B, 226C, and 226D are extended so as to be plastically deformed in the axial direction (see FIG. 15B). Can be extended in the axial direction, resulting in a V-shaped slit in side view.

  In addition, the contraction structure of the axial direction of the power transmission part 25 demonstrated in FIG. 12 thru | or FIG. 15 is applicable to the power transmission part 25 of the fastening apparatus 1 demonstrated in 1st embodiment.

  As described above, in the first embodiment, the case where the material itself of the power transmission unit 25 does not expand and contract in the axial direction is illustrated, but the present invention is not limited to this. For example, as shown in FIG. 16, the power transmission part 25 may include a cylindrical thin part 25 </ b> A that approaches the outer peripheral surface of the shaft part 5. Thereby, since the margin clearance S can be ensured between the power transmission portion 25 and the hole HP of the fastened member H, the thin portion 25A is deformed in the radial direction in the margin clearance S, and the axial dimension is reduced. It becomes possible to shorten. As a result, since the fastening amount by the back side engaging part 60 and the 2nd rotation part 20 is securable, it becomes possible to respond flexibly to the thickness change of the to-be-fastened member H. Here, the thin-walled portion 25A has a cylindrical shape, but a plurality of rod-like members extending in the axial direction may have a bowl shape arranged in the circumferential direction.

  16B, the thin portion 25A may be brought closer to the hole HP side of the fastened member H, and one end portion of the thin portion 25A as shown in FIG. 16C. Can be in the shape of a slanted cylinder so that the end HP approaches the hole HP of the fastened member H and the other end approaches the outer peripheral surface of the shaft portion 5. Although illustration of a 2nd rotation part is abbreviate | omitted, as shown to FIG. 17 (A), both ends of the thin part 25A approach the hole HP of the to-be-fastened member H, and the center side is on the outer peripheral surface of the axial part 5. It can also be a curved cylindrical shape approaching. As shown in FIG. 17 (B), both end portions of the thin portion 25A approach the outer peripheral surface of the shaft portion 5, and the center side may have a curved cylindrical shape approaching the hole HP of the fastened member H. it can. As shown in FIG. 17C, a certain range from both ends of the thin portion 25A toward the center approaches the hole HP of the fastened member H, and the center side except these approaches the outer peripheral surface of the shaft portion 5. It can also be set as a curved shape.

  Further, as shown in FIG. 17D, the thin portion 25A may have a cylindrical structure having a non-circular cross section. For example, the cross-sectional shape can be a star shape, a polygonal shape, a sawtooth shape continuous in the circumferential direction, a jagged shape, a zigzag shape, or a wave shape. At this time, by forming the opening 25D in the middle of the thin portion 25A, the fragile region 25E that is easily buckled or deformed in the axial direction can be formed.

  Further, as shown in FIG. 17E, the power transmission portion 25 is formed by laminating wave ring pieces in which a ring-shaped member is formed into a wave shape in multiple stages in the axial direction, or by winding a wire while spirally winding a wire. It can also be a so-called wave spring configured by stacking in a shape. If it does in this way, it can expand and contract by elastically deforming in the axial direction. A so-called coil spring may be used instead of the wave spring.

  16 and 17, the axial force required when the rear side engaging portion 60 is deformed or displaced is prevented from contracting the power transmitting portion 25 in the axial direction. When force (that is, axial force at the time of fastening) is applied, the force is positively contracted.

  Moreover, in 1st embodiment, although the case where the back side engaging part 60 was displaced so that it might translate in the radial direction outer side was illustrated, this invention is not limited to this. For example, as shown in FIG. 18 in which the contraction structure of the power transmission part 25 is omitted, the back side engaging part 60 is a deformation sleeve, and the side surface of the deformation sleeve after deformation is easily buckled toward the outside in the radial direction. May be the forward facing seat portion 64.

  In addition, although the case where there is one deformation sleeve is illustrated here, a plurality of deformation sleeves may be arranged separately or integrally in the axial direction, and each deformation sleeve may be buckled to form a multistage washer. .

  Furthermore, in 1st embodiment, the receiving part 11 of the clamping part 10 and the back side engaging surface 66 of the back side engaging part 60 are made into a taper surface, and the back side engaging part 60 is utilized using this taper surface. Although the case where it moved to the radial direction outer side was illustrated, this invention is not limited to this.

  For example, as shown in FIG. 19 and FIG. 20 in which the contraction structure of the power transmission unit 25 is omitted, the back side engaging portion 60 is arranged on the front side, the first back side engaging piece 660, and the back side. The second back side engagement piece 680 may be provided.

  As shown in FIG. 23, the first back side engaging piece 660 and the second back side engaging piece 680 have a common shape, and each has through holes 661 and 681 extending in the axial direction. When viewed from the axial direction, the holes 661 and 681 have a long hole shape extending in the radial direction. In FIG. 23, the first back side engagement piece 660 is in a posture reversed in the axial direction and the diameter direction.

  The first back side engagement piece 660 and the second back side engagement piece 680 are slidable in the radial direction by the length of the oval hole in a state where the shaft portion 5 is passed through the through holes 661 and 681. . Further, the first back side engagement piece 660 and the second back side engagement piece 680 have contact surfaces 663 and 683 that contact (oppose) each other, and the contact surfaces 663 and 683 pass through. The holes 661 and 681 are inclined in the long hole direction.

  Referring back to FIG. 19, the first back side engagement piece 660 and the second back side engagement piece 680 have a common shape, but are in an axially inverted state and a diametrically inverted state, that is, a contact surface. 663 and 683 are arranged in a point-symmetric state so as to face each other. As a result, the back side engaging surface 66 of the back side engaging portion 60 and the forward facing seat portion 64 are parallel to the direction perpendicular to the axis, and the contact surfaces 663 and 683 are inclined.

  Accordingly, as shown in FIGS. 21 and 22, when the holding portion 10 and the power transmission portion 25 are brought close to each other and the holding force is applied to the contact surfaces 663 and 683, the first back-side engagement piece 660 is moved. It moves to one side in the diameter direction, and the second back side engagement piece 680 moves to the other side in the diameter direction. That is, the first back side engagement piece 660 and the second back side engagement piece 680 are separated from each other in the diametrical direction. As a result, the front-facing seat portions 64 respectively formed on the first back-side engagement piece 660 and the second back-side engagement piece 680 move outward in the radial direction and protrude from the power transmission portion 25. As described above, it is also preferable that the back side engaging portion 60 is constituted by a plurality of members and the plurality of members are separated outward in the radial direction by disposing a tapered surface inside. In addition, although the interlocking mechanism is arrange | positioned here at the inner periphery of the back side engaging part 60, illustration is abbreviate | omitted.

  In addition, in a state where no external force is applied to the contact surfaces (tapered surfaces) 663 and 683, the first back side engagement piece 660 and the second back side engagement piece 680 are prevented from moving in the radial direction due to vibration or dead weight. For this purpose, a winding member such as a rubber ring is arranged around these members, the contact surfaces (tapered surfaces) 663 and 683 are temporarily fixed with an adhesive, the first back side engagement piece 660 and the second It is also preferable to attract the back side engagement piece 680 by magnetic force. When a restricting member such as a rubber ring is disposed, the first back side engaging piece 660 can be moved in a direction opposite to the tightening direction by rotating the relative rotating direction of the first rotating member 15 and the second rotating member 20. The second back side engagement piece 680 can be returned to the original coaxial position, and therefore the fastening device 1 that is in the fastening body with respect to the fastened member H can be detached from the fastened member H. Become.

  Further, in the modification example shown in FIGS. 19 to 23, the case where the back side engaging portion 60 is disposed in a state of being relatively rotatable in the circumferential direction with respect to the sandwiching portion 10 and the power transmission portion 25 is illustrated. However, the present invention is not limited to this.

  For example, as shown in FIGS. 24 and 30 in which the contraction structure of the transmission portion 25 is omitted, the oval direction of the through holes 661 and 681 (diameter direction of the shaft portion 5) with respect to the receiving portion 11 in the clamping portion 10 The receiving portion guide unevenness 11x extending in the direction of the shaft portion 5 extends in the diameter direction of the shaft portion 5 with respect to the respective back side engaging surfaces 66 of the first back side engaging piece 660 and the second back side engaging piece 680. The guide guide unevennesses 664 and 684 are formed, and the receiving portion guide unevenness 11x and the engagement piece guide unevennesses 664 and 684 can be slidable in the diameter direction and engaged in the circumferential direction. If it does in this way, since the 1st back side engaging piece 660 and the 2nd back side engaging piece 680 engage with the receiving part 11 in the circumferential direction, this back side engaging part 60 is the clamping part 10. Rotational power can be transmitted.

  Further, the inner guide irregularities 663a, 683a extending in the same direction as the engagement piece guide irregularities 664, 685 with respect to the contact surfaces 663, 683 of the first rear side engagement piece 660 and the second rear side engagement piece 680, respectively. , And the internal guide irregularities 663a and 683a can be slidable in the diametrical direction and engaged in the circumferential direction. In this case, the first back side engaging piece 660 and the second back side engaging piece 680 are slidable in the diametrical direction and engaged in the circumferential direction. Rotational power can be transmitted between the back side engaging pieces 680.

  Further, a seat guide irregularity 64x is formed on the front-facing seat portion 64 of the first back-side engagement piece 660 and the second back-side engagement piece 680, and the back-side end surface 26 of the power transmission portion 25 is formed. On the other hand, it is possible to form the power guide guiding unevenness 26x extending in the diametrical direction, and to allow the seat guide guiding unevenness 64x and the power transmitting portion guide unevenness 26x to be slidable in the diameter direction and engaged in the circumferential direction. it can. If it does in this way, since the 1st back side engagement piece 660 and the 2nd back side engagement piece 680 engage with the power transmission part 25 in the circumferential direction, the power transmission part 25 will be the back side engagement part. Rotational power can be transmitted to 60. With the above configuration, as shown in FIG. 25, the rotational force of the power transmission unit 25 can be transmitted to the clamping unit 10 via the back side engagement unit 60, and thus also serves as the interlocking mechanism 90 shown in the first embodiment ( Can be omitted).

  As shown in FIGS. 26 and 27, when the holding portion 10 and the power transmission portion 25 are brought close to each other and the holding force is applied to the contact surfaces 663 and 683, the power transmission portion guide unevenness 26x and the seat portion guide unevenness are obtained. 64x, inner guide unevennesses 663a and 683a, engagement piece guide unevennesses 664 and 684, and receiving portion guide unevenness 11x while being guided in the diameter direction, the first back side engagement piece 660 and the second back side engagement piece 680 Are diametrically separated from each other. As a result, the front-facing seat portions 64 respectively formed on the first back-side engagement piece 660 and the second back-side engagement piece 680 move outward in the radial direction and protrude from the power transmission portion 25.

  In the modification, the two first back side engagement pieces 660 and the second back side engagement pieces 680 are engaged in the diameter direction while being engaged with the transmission portion 25 and the sandwiching portion 10 in the circumferential direction. Although the case where it separates was illustrated, this invention is not limited to this, For example, the front facing seat part 64 of each back side engaging piece 62 of the back side engaging part 60 shown in 1st embodiment of FIG. A guide unevenness extending in the radial direction is formed on the rear engagement surface 66, and the guide unevenness is engaged with the guide unevenness formed in the same direction with respect to the power transmission portion 25 and the receiving portion 11. You may make it let it. That is, the back side engaging portion 60 may transmit the rotational force of the power transmission portion 25 to the clamping portion 10 by forming guide irregularities radially on the mutual contact surfaces.

  In addition, as the shape of the guide unevenness that is slidable in the radial direction and engaged in the circumferential direction, various modes such as a sawtooth shape in cross section, a rectangular shape in cross section, and dovetail grooves that cannot be separated from each other can be selected.

  Further, in the first to second embodiments, the case where the back side engaging portion 60 is mainly arranged in the axial direction is exemplified, but for example, as shown in FIG. 31, the back side engaging portion 60 is set in the axial direction. A plurality of multi-stage back side engagement pieces 690A, 690B, and 690C are provided, and the back side engagement pieces 690A, 690B, and 690C are radially outwardly contracted while being axially contracted by a nested structure or a telescopic structure. Expansion is also preferred. If the back side engagement pieces 690A, 690B, 690C are engaged in the axial direction in the expanded state, only the innermost back side engagement piece 690C is sandwiched between the holding part 10 and the power transmission part 25. The inner side engagement piece 690A disposed on the outermost side can be held in the axial direction. As a result, the moving amount in the radial direction of the back side engaging piece 690A arranged on the outermost side can be set large.

  Next, another modification of the fastening device of the first or second embodiment will be described.

  FIGS. 32A to 32C show an axial contraction structure or a radial expansion structure applicable to the power transmission section 25 or the back engagement section 60. This contraction or expansion structure is a so-called PCCP shell (Pseudo-Cylindrical Concave Polyhedral Shell) structure P in which trusses (triangular skeleton structures) are three-dimensionally combined. A portion (bottom portion) that protrudes radially outward and contacts the bottoms extending in the direction perpendicular to the axis is recessed radially inward. A portion where the oblique sides of the triangle are in contact with each other (the transition portion) connects the apex portion and the bottom portion. With this polyhedron, a pseudo cylinder can be formed. The PCCP shell structure P can be contracted (deformed) in the axial direction, and at that time, the apex portion protrudes radially outward. You may apply this PCCP shell structure P to the power transmission part 25 or the back side engaging part 60. FIG. Therefore, in the plane of the triangle, a region having high strength and difficult to deform is formed, and each side or each vertex of the triangle can constitute a region that can be easily deformed by a fold.

  FIGS. 32D to 32F show an axial contraction structure or a radial expansion structure applicable to the power transmission section 25 or the back engagement section 60. This contraction or expansion structure is a telescopic tube structure D in which a truss (skeleton structure) using a trapezoid is three-dimensionally combined, and a portion (short side portion) where the short sides of the trapezoid extending in the direction perpendicular to the axis intersect. A portion (long side portion) that protrudes radially outward and contacts long sides extending in the direction perpendicular to the axis is recessed radially inward. The part (transition part) where the oblique sides contact each other connects the short side part and the long side part. With this polyhedron, a pseudo cylinder can be formed. The telescopic tube structure D can be contracted (deformed) in the axial direction, and at that time, the short side portion projects outward in the radial direction. You may apply this expansion-contraction pipe structure D to the power transmission part 25 or the back side engaging part 60. FIG. Accordingly, the trapezoidal plane is a region that is strong and difficult to deform (hard deformation region), and each side or each vertex of the trapezoid forms a region that can be easily deformed by a fold (easy deformation region). Is possible. A parallelogram or a hexagon can be used instead of the trapezoid. For reference, FIG. 32G shows a state in which this type of PCCP shell structure or expansion tube structure is contracted in the axial direction. In general, the telescopic tube structure D can be more easily deformed in the axial direction than the PCCP shell structure P.

  FIG. 32H is an example in which both the PCCS shell structure P and the telescopic tube structure D are applied to the power transmission unit 15. In this case, the telescopic tube structure D shrinks preferentially. FIG. 32 (I) shows an example in which the telescopic tube structure D is applied to a part of the power transmission portion 25, the remaining portion is a straight polygonal tube, and the telescopic tube structure D is applied to the back engagement portion 60. It is. Note that a constriction is formed at the boundary between the power transmission portion 25 and the rear side engagement portion 60. FIGS. 32 (J) and (K) are examples in which the telescopic tube structure D is applied to the power transmission portion 25 and the telescopic tube structure D is also applied to the back side engaging portion 60. FIG. As for, it forms a confinement at the boundary.

  FIG. 32 (L) is an example in which the second rotating portion 20, the power transmission portion 25, the back side engagement portion 60, and the sandwiching portion 10 are integrally formed, and the PCCP shell structure P is applied to the power transmission portion 25. The telescopic tube structure D is applied to the back side engaging portion 60.

  FIG. 33A is an example in which the second rotating portion 20, the power transmitting portion 25, the back side engaging portion 60, and the clamping portion 10 are integrally formed. Here, further, a slit in the circumferential direction is formed on the outer peripheral surface of the central portion in the axial direction of the back side engaging portion 60 to form an easily deformable region 620A, and further on the both outer sides in the axial direction of the easily deformable region 620A. The easily deformable regions 620B and 620C are formed by a constricted structure.

  FIG. 33 (B) is an example in which the second rotating portion 20, the power transmitting portion 25, the back side engaging portion 60, and the clamping portion 10 are integrally formed. Here, in the rear side engaging portion 60, the axially central side is curved outward in the radial direction, and a circumferential slit is formed on the outer peripheral surface of the axially central portion to form the easily deformable region 620.

  33 (C) and 33 (D) are examples in which the second turning portion 20, the power transmission portion 25, the back side engaging portion 60, and the clamping portion 10 are integrally formed. Here, further, the back side engaging portion 60 is curved so that the center in the axial direction is curved outward in the radial direction, and the thickness is made thinner toward the protruding end. In addition, a plurality of notches extending in the axial direction are formed in the axial direction central portion in the circumferential direction, so that the axial central portion serves as an easily deformable region 620. In addition, the power transmission unit 25 forms a fragile region that is easily buckled or deformed in the axial direction by forming a plurality of openings 25D in a matrix in the middle of the axial direction.

  FIG. 33 (E) is an example in which the second rotating part 20, the power transmission part 25, the back side engaging part 60, and the clamping part 10 are integrally formed. Here, further, in the rear side engaging portion 60, the axially central side is curved outward in the radial direction so that the wall thickness decreases toward the protruding end. Due to this thin structure, the central portion in the axial direction is an easily deformable region 620.

  FIG. 33 (F) is an example in which five or more back side engagement pieces 62 are arranged in the circumferential direction in the back side engagement part 60, and the continuous ring part 72 is arranged therebetween.

  As described above, the present invention can take various configurations, and is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Fastening device 5 Shaft part 10 Clamping part 11 Receiving part 11a First receiving part 11b Second receiving part 11c Step part 15 First turning part 16 Backward facing seat part 20 Second turning part 21 Backward facing seat part 22 Front side End face 25 Power transmission part 25A Thin part 25D Opening 25E Fragile area 26 Back side end face 26c Step part 27 Front side end face 28A First power transmission piece 28B Second power transmission piece 29 Shearing part 30 Screwing part 60 Back side engagement part 62 Back side engagement piece 64 Seat portion 66 Back side engagement surface 66a First back side engagement surface 66b Second back side engagement surface 70 Protrusion restricting portion 72 Interlocking portion 80 Deformation sleeve 82 Buckling region 84 Non-buckling region 90 Interlocking mechanism 92 Interlocking sleeve 94 Sleeve receiving hole H Fastened member HP hole

Claims (12)

A clamping part arranged on the back side in the axial direction;
A first rotating part and a second rotating part which are arranged on the near side in the axial direction and are rotatable relative to each other;
A power transmission unit disposed between the first rotation unit and the second rotation unit and the clamping unit to transmit axial force;
A back-facing seat portion formed on at least one of the first rotating portion and the second rotating portion and facing the back side;
A back side engaging portion that is clamped in the axial direction between the power transmission portion and the clamping portion;
A threaded portion that converts relative rotation of the first rotating portion and the second rotating portion into relative movement in the axial direction of the clamping portion and the power transmitting portion;
The power transmission portion includes a contraction mechanism in which an axial length contracts inside the fastened member when an axial force exceeding an axial force acting when the back side engaging portion is deformed or displaced is applied. Have
By causing the sandwiching portion and the power transmission portion to approach each other in the axial direction, the rear engagement portion is deformed or displaced so that it protrudes outward in the radial direction from the sandwiching portion and the power transmission portion. Forming a facing front facing part,
Utilizing the front-facing seat and the back-facing seat, it engages with a fastened member,
Fastening device. The power transmission unit includes a first power transmission piece located on the back side and a second power transmission piece located on the near side,
The axial length of the power transmission portion contracts by sliding the first power transmission piece and the second power transmission piece in the axial direction.
The fastening device according to claim 1. The first power transmission piece and the second power transmission piece are inserted into a fastened member,
The fastening device according to claim 2. A shearing part is disposed between the first power transmission piece and the second power transmission piece, and the first power transmission piece and the second power transmission piece are engaged in the axial direction by the shearing part,
When the shearing portion is sheared by an axial force that exceeds an axial force acting when the rear engagement portion is deformed or displaced, the first power transmission piece and the second power transmission piece are axially moved. Characterized by sliding,
The fastening device according to claim 2 or 3. The power transmission part is constituted by a member that is extendable in the axial direction,
The fastening device according to any one of claims 1 to 4. The power transmission part is constituted by a cylindrical member having a plurality of notches extending in a direction perpendicular to the axis.
The fastening device according to any one of claims 1 to 5. The power transmission part is constituted by a member that is elastically deformable in an axial direction,
The fastening device according to any one of claims 1 to 6. The power transmission portion, the back side engagement portion, and the clamping portion are configured to engage with each other in the circumferential direction so as to be freely rotatable.
The fastening device according to any one of claims 1 to 7. The power transmission unit, the back side engagement unit and the clamping unit are configured integrally,
The fastening device according to any one of claims 1 to 8. An axial portion extending in the axial direction that can be rotated with the first rotating portion and has an external thread portion;
The clamping part has a female screw part screwed with the male screw part,
The second rotating part and the power transmission part can be rotated,
Between the said clamping part and the said power transmission part, while providing the said clamping part and the said power transmission part, it is provided with the interlocking mechanism which carries out relative movement of this clamping part and the said power transmission part to an axial direction. Features
The fastening device according to any one of claims 1 to 9. The back side engaging portion has the front facing seat portion facing the front side before being deformed or displaced,
When the sandwiching portion and the power transmission portion approach each other, the front-facing seat portion moves radially outward, and the front-facing seat portion protrudes radially outward from the sandwiching portion and the power transmission portion. It is characterized by
The fastening device according to any one of claims 1 to 10. The power transmission portion is configured by using a plurality of one or more micro surfaces of any one of a substantially triangular shape, a substantially parallelogram shape, a substantially trapezoidal shape, and a substantially hexagonal shape. It is configured to be retractable,
The fastening device according to any one of claims 1 to 11.

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