Clamping tool

Abstract

To solve the problem that in a clamping tool for clamping an object to be clamped by tightening a screw body, when the object to be clamped vibrates, there is a risk of vibration fatigue or loosening of the screw body due to vibration.SOLUTION: A clamping tool comprises: a first clamping body 2 having a first clamping part 2a and a storage part 5; and a second clamping body 3 having a second clamping part 3a, an insertion hole 3c into which a male screw part 30b can be inserted, an insertion part 6 that can be stored in the storage part 5, and a first female screw part 11 provided with a first spiral thread 12 that is coaxial with the insertion hole 3c and can screw into the first spiral groove 31, where the insertion part 6 can be advanced and retreated within the storage part 5 by screwing the male screw part 30b and the first female screw part 11 relative to each other.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a clamping device. [Background technology]

[0002] Conventionally, a clamping device is known that clamps a clamped object by bringing a pair of clamping bodies close to each other so as to narrow the gap by tightening a screw body. For example, a snow-stop angle mounting bracket (see, for example, Patent Document 1) is used in which an angle mounting part to which a snow-stop angle can be attached is provided on the upper part of a bracket body that can be clamped and fixed to a mounting part of a roof (such as the seam part of a vertical flat roof). Such a snow-stop angle mounting bracket is placed on a roof so that the mounting part of the roof is sandwiched between a pair of opposing clamping bodies, and is attached and fixed to the mounting part (on the roof) by screwing and tightening a tightening nut to a tightening bolt installed between the opposing clamping bodies. That is, by tightening the tightening nut to the tightening bolt, the pair of opposing clamping bodies come close to each other, and the mounting part is clamped and held from both outsides by the opposing clamping bodies, and the snow-stop angle mounting bracket is attached and fixed to the mounting part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-065311 Summary of the Invention [Problem to be solved by the invention]

[0004] In a clamping device that clamps a clamped object by tightening a threaded body, if the clamped object vibrates, the threaded body may be broken due to vibration fatigue or may become loose due to vibration. Therefore, measures against fatigue breakage and loosening due to vibration are required for the clamping device. [Means for solving the problem]

[0005] The clamping device of the present invention for solving the above problem is a clamping device that clamps a clamped body between a first clamping portion and a second clamping portion, and has a male-threaded body having a male-threaded portion with a spiral groove formed on the outer peripheral surface of a shaft portion, the first clamping portion and the second clamping portion have an insertion hole into which the male-threaded body is inserted, one of the first clamping portion and the second clamping portion has an insertion portion that is approximately cylindrical and has an inner diameter that is larger than the outer diameter of the shaft portion of the male-threaded body, and the other has a receiving portion in which at least a portion of the insertion hole receives the insertion portion and communicates with the insertion hole, and a helical thread that can be screwed into the male-threaded body is formed on the inner peripheral surface of the insertion hole of the first clamping portion and / or the second clamping portion.

[0006] In addition, the clamping device of the present invention is characterized in that a first male thread spiral groove set at an appropriate lead angle and / or lead direction and a second male thread spiral groove set at a lead angle and / or lead direction different from that of the first male thread spiral groove are formed in the same region on the outer circumferential surface of the shank of the male threaded portion, the first clamping portion and the second clamping portion are provided on the tip end side of the male threaded body with a first female thread spiral rib that can be screwed into the first male thread spiral groove, and the inner circumferential surface of the insertion hole of the first clamping portion and / or the second clamping portion is formed with a second female thread spiral rib that can be screwed into the second male thread spiral groove.

[0007] In addition, the clamping device of the present invention is characterized in that the female threaded body is screwed into the male threaded body, the clamping device has one or more plate pieces arranged protruding from a through hole toward an axis, and the tip of the plate piece forms an intermittent or continuous spiral rib.

[0008] Furthermore, the clamping device of the present invention is characterized in that the first clamping portion has a guide portion that guides the female-threaded body so that it can be inserted and removed, the guide portion regulates the rotation of the female-threaded body around the axial direction, and the female-threaded body arranged in the guide portion communicates with each of the insertion holes of the first clamping portion and the second clamping portion and can be screwed into the male screw.

[0009] In addition, the clamping device of the present invention is characterized in that the guide portion has a groove that supports the peripheral surface of the female-threaded body, and an opening that can displace the female-threaded body in a direction perpendicular to the axis.

[0010] In the clamping device of the present invention, the female-threaded body is mounted on or inside the guide portion.

[0011] In addition, the clamping device of the present invention is characterized in that the female threaded body has a removal portion located outside the guide portion. Effect of the Invention

[0012] According to the clamping device of the present invention, with a simple structure, it is possible to suppress fatigue fracture of the threaded body and to prevent loosening, thereby maintaining the fastened state for a long period of time. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a perspective view of the clamping device according to the first embodiment, seen from a second clamping body side. [Diagram 2] 1 is a perspective view of a clamping device according to a first embodiment, viewed from a first clamping body side. FIG. [Diagram 3] 1A to 1D are views showing a first clamping body according to a first embodiment, in which (A) is a front view, (B) is a side view, (C) is a rear view, and (D) is a bottom view. [Figure 4] 3A to 3D are views showing a second clamping body according to the first embodiment, in which (A) is a rear view, (B) is a side view, (C) is a front view, and (D) is a top view. [Diagram 5] FIG. 4 is a cross-sectional view showing a second clamping body according to the first embodiment. [Figure 6] FIG. 2 is a view showing a male-threaded body according to the first embodiment. [Figure 7] FIG. [Figure 8] FIG. 11 is a cross-sectional view showing a clamping device according to a modified example of the first embodiment. [Figure 9] FIG. 11 is a perspective view showing a clamping instrument according to a second embodiment. [Figure 10]5A and 5B show a male-threaded body according to a second embodiment, in which (A) is a front view and (B) is a plan view showing the male-threaded portion in both spiral groove regions. [Figure 11] FIG. 11 is a diagram showing another example of the male thread portion according to the second embodiment. [Figure 12] 11A to 11D are views showing a second clamping body according to a second embodiment, in which (A) is a front view, (B) is a side view, (C) is a rear view, and (D) is a top view. [Figure 13] 1 shows a female-threaded body, in which (A) is a front view, (B) is a rear view, (C) is a side view, and (D) is a cross-sectional view taken along the line AA in (A). [Figure 14] 11A to 11C are views showing a procedure for mounting the female-threaded body to a second holding body. [Figure 15] 1A is a partial cross-sectional view showing a state in which a rotational force is applied to a right-handed female-threaded body to rotate it, and FIG. 1B is another partial cross-sectional view of FIG. [Figure 16] 10A, 10B, 10C, and 10D are cross-sectional views taken along the line AA of the drawings, each showing an internally-threaded body according to a modified example of the second embodiment. [Figure 17] FIG. 13A is a top view of a guide portion according to a modified example of the second embodiment, and FIG. 13B is a top view of a state in which an internally-threaded body is disposed in the guide portion. [Figure 18] FIG. 13 is a diagram showing a clamping instrument 300 according to a third embodiment. [Figure 19] 13A is a front view illustrating the transition of the relative rotation state of a relative rotation suppression structure according to a modified example of the fourth embodiment; (B) is a cross-sectional view taken along the line BB of (A); (C) is a front view; (D) is a cross-sectional view taken along the line DD of (C); (E) is a front view; and (F) is a cross-sectional view taken along the line FF of (E). [Figure 20] 4A is a front view and FIG. 4B is a plan view of a second clamping body to which a relative rotation suppression structure is applied. [Figure 21] FIG. 2A is a front view and FIG. 2B is a plan view of an internally-threaded body to which a relative rotation suppression structure is applied. [Figure 22] 4 is a diagram showing the outer circumferential length of an annular convex portion and the inner circumferential length of an annular concave portion. FIG. [Diagram 23]19(A) is an enlarged cross-sectional view of (F) in FIG. 19, and (B) is a cross-sectional view showing a state in which the second internally-threaded body has been relatively rotated with respect to (A). [Figure 24] FIG. 13 is a partial cross-sectional side view showing a reverse rotation prevention structure for a male-threaded body of a fourth embodiment. [Diagram 25] 1 shows a male-threaded body used in a reverse rotation prevention structure, where (A) is a partial cross-sectional side view and (B) is a bottom view. [Figure 26] 1A and 1B show a washer used in a reverse rotation prevention structure, where (A) is a top view and (B) is a partial cross-sectional side view. [Figure 27] 13A and 13B are diagrams showing other examples of the first clamping portion and the second clamping portion. [Figure 28] FIG. 13 is a diagram showing an example of another internally threaded body. [Figure 29] FIG. 13 is a diagram showing an example in which a plurality of objects to be clamped are clamped. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, the clamping device 1 according to the first embodiment will be described with reference to the drawings. The dimensions, materials, shapes, and relative arrangements of the components described as the embodiment or shown in the drawings are merely illustrative examples, and are not intended to limit the scope of the present invention to the above-mentioned contents. For example, expressions expressing a relative or unambiguous arrangement, such as "in a certain direction," "along a certain direction," "toward a certain direction," "parallel," "orthogonal," "vertical," "center," "concentric," or "coaxial," not only strictly express such an arrangement, but also express a state in which things are relatively displaced with a tolerance or an angle and distance to the extent that the same function is obtained. For example, expressions expressing that things are in an equal state, such as "same," "equal," "uniform," and "equal density," not only strictly express a state in which things are in an equal state, but also express a state in which there is a tolerance, or a difference to the extent that the same function is obtained, or a ratio. For example, expressions expressing shapes such as a triangular pyramid, a cone, a triangular prism, and a cylinder not only express shapes such as a triangular pyramid, a cone, a triangular prism, and a cylinder in the strict geometric sense, but also express shapes including uneven portions, chamfered portions, curved portions, R-shaped portions, etc., within the scope in which the same effect is obtained. On the other hand, expressions such as "comprise", "formed by", "include", "equip", "include", "contain", or "have" a certain component are not exclusive expressions that exclude the presence of other components.

[0015] 1 is a perspective view showing a fastening member 1 according to this embodiment, and the fastening member 1 clamps and fastens fastened members in a gap between a first narrow fastening portion and a second narrow fastening portion. The fastening member 1 can adjust the amount of gap between the male threaded body and the first narrow fastening portion and the second narrow fastening portion.

[0016] In addition, in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional Cartesian coordinate system. In the XYZ coordinate system, for the sake of convenience, the X-axis direction is taken to be parallel to the axial direction of the male-threaded body 10. The Y-axis direction is taken to be perpendicular to the X-axis direction and is the width direction of the fastened member 10. The Z-axis direction is taken to be perpendicular to both the X-axis direction and the Y-axis direction. In addition, any direction in which the XY plane defined by the X-axis and Y-axis extends is referred to as the "horizontal direction."

[0017] In the following description, the Z-axis direction is the up-down direction, the positive side (+Z side) of the Z-axis direction is referred to as the "upper side (upper side in the Z-axis direction)", and the negative side (-Z side) of the Z-axis direction is referred to as the "lower side (lower side in the Z-axis direction)". The X-axis direction is the front-rear direction (length direction), the positive side (+X side) of the X-axis direction is referred to as the "front", and the negative side (-X side) of the X-axis direction is referred to as the "rear". The radial direction centered on the X-axis is simply referred to as the "radial direction", and the circumferential direction (θ direction) centered on the X-axis is simply referred to as the "circumferential direction". The Y-axis direction is the width direction. Note that the radial direction, circumferential direction, up-down direction, upper and lower sides, front-rear direction (length direction), front and rear, and width direction are names used simply for the purpose of explanation and do not limit the actual positional relationship and direction.

[0018] In this specification, "extend" includes not only extending strictly in the axial direction but also extending in a direction tilted at an angle of 45° or less from the axial direction, and "extend in the radial direction" includes not only extending strictly in the radial direction, i.e., in a direction perpendicular to the X-axis direction, but also extending in a direction tilted at an angle of 45° or less from the radial direction.

[0019] The clamping device 1 of the first embodiment narrows the gap between the first clamping portion 2a and the second clamping portion 2b by tightening the male threaded body 10, and clamps the clamped object P between the first clamping portion 2a and the second clamping portion 2b. In this embodiment, the clamping tool 1 can be generally applied to anything that can clamp at least a clamped object P. In addition, there is no limitation on the object to be clamped.

[0020] As shown in Figures 1 and 2, the clamping device 1 comprises a first clamping body 2, a second clamping body 3, and a male threaded body 10. The male threaded body 10 is inserted into the first clamping body 2 and screwed into the first female threaded portion 11 of the second clamping body 3. By tightening the male threaded body 10, the first clamping body 2 is displaced toward the second clamping body 3, and the second clamping body 3 is displaced toward the first clamping body 2, so that the clamped object P located between the first clamping body 2 and the second clamping body 3 can be clamped.

[0021] 3 shows the first clamping body 2, where (A) is a front view, (B) is a side view, (C) is a rear view, and (D) is a bottom view. From the lower side (−Z side), the first clamping body 2 has a first clamping portion 2a, a main body portion 2b continuing therefrom, and the like.

[0022] The first clamping portion 2a is disposed facing the second clamping portion 3a of the second clamping body 3 so as to clamp the clamped object P (see FIG. 1, for example). The first clamping portion 2a is formed to protrude toward the second clamping body 3 (+X side) along the lower edge of the main body portion 2b. The portion of the first clamping portion 2a that contacts the clamped object P has a shape corresponding to the surface shape of the clamped object P. For example, when a recess such as a groove is formed in the clamped object P, the first clamping portion 2a has a protrusion that can fit into the recess. Alternatively, the first clamping portion 2a may be provided with unevenness, strip-shaped protrusions, grooves, and / or multiple small unevenness on the contact surface against the clamped object P to improve the frictional force between the first clamping portion 2a and the clamped object P.

[0023] The main body 2b is formed in an inverted L-shape, and has an insertion hole 2c at approximately the center of the long side (YZ plane) of the inverted L-shape. The insertion hole 2c extends in the X-axis direction, and the male threaded body 10 can be inserted from the rear (-X side) of the first clamping body 2.

[0024] The diameter of the insertion hole 2c, at the entrance side where the male threaded body 10 is inserted, is smaller than the outer diameter of the head 20 of the male threaded body 10 and larger than the diameter of the shaft portion 30. On the other hand, at the exit side of the male threaded body 10 inserted into the first clamping body 2, the diameter of the insertion hole 2c is enlarged, and a hollow cylindrical receiving portion 5 is formed.

[0025] The accommodation portion 5 accommodates the insertion portion 6 of the second clamping body 3. The accommodation portion 5 does not need to accommodate the entire insertion portion 6, and may be formed to accommodate at least a part of the insertion portion 6. Specifically, it is sufficient that the accommodation portion 5 is configured so that the insertion portion 6 can relatively advance and retreat within the accommodation portion 5, and that the accommodation portion 5 can share a part or all of the bending load and shear load acting on the male-threaded body 10 with the insertion portion 6 accommodated in the accommodation portion 5 to a certain extent, thereby supporting and reinforcing the male-threaded body 10 and suppressing a decrease in the durability and fatigue degree of the male-threaded body 10. By configuring it in this manner, not only is it possible to suppress a decrease in the yield strength of the male threaded body 10 and extend its fatigue life, but it is also possible to improve the durability of the clamping device 1 and further extend its fatigue life.

[0026] The body 2b has a groove 2d formed in the short side (XY plane) of the inverted L shape, approximately parallel to the X-axis direction. The groove 2d is formed with a bottom so that the lower side (-Z side) from the short side is an open surface. The wall 2e constituting the groove 2d abuts against a positioning portion 3d of the second clamping body 3, which will be described later, and positions the first clamping body 2 and the second clamping body 3 in the Y direction. Furthermore, the groove portion 2d may be formed in a so-called dovetail shape (a groove having a cross section shaped like an inverted V) to prevent the positioning portion 3d from becoming displaced in the vertical direction when inserted into the groove portion 2d.

[0027] This facilitates positioning of the first clamping body 2 and the second clamping body 3 during the operation of clamping the object to be clamped P, and also prevents the misuse of parts with different shapes of the positioning portion 3d. Furthermore, when fastened by the male thread body 10, not only is relative rotation between the first clamping body 2 and the second clamping body 3 prevented, but rattling between the first clamping body 2 and the second clamping body 3 is also prevented, and relative inclination is also prevented.

[0028] 4 shows the second clamping body 3, where (A) is a rear view, (B) is a side view, (C) is a front view, and (D) is a top view. The second clamping body 3 has, from the lower side (−Z side), a second clamping portion 3a, a main body portion 3b continuing above the second clamping portion 3a, and a positioning portion 3d.

[0029] The second clamping portion 3a is disposed so as to face the first clamping portion 2a of the first clamping body 2 and clamp the clamped object P (see FIG. 1). The second clamping portion 3a is formed so as to protrude toward the first clamping body 2 along the lower end edge of the main body portion 3b. The portion of the second clamping portion 3a that contacts the clamped object P has a shape corresponding to the surface shape of the clamped object P. For example, when a recess such as a groove is formed in the clamped object P, the second clamping portion 3a has a protrusion that can fit into the recess. Alternatively, the second clamping portion 3a may be configured to improve the frictional force between the clamped object P and the clamped object P by providing unevenness, strip-shaped protrusions, grooves, and / or multiple small unevenness on the contact surface against the clamped object P.

[0030] The main body 3b has an insertion hole 3c at approximately the center thereof into which the male threaded portion 30b of the male threaded body 10 can be inserted. A hollow cylindrical insertion portion 6 extending in the X-axis direction toward the first clamping body 2 is connected to the insertion hole 3c. At least a portion of the insertion portion 6 can be accommodated in the accommodation portion 5 of the first clamping body 2.

[0031] A first helical rib 12 (see FIG. 5, for example) constituting the first female thread portion 11 is formed on the inner peripheral wall portion 6b of the insertion hole 3c. The first helical rib 12 is screwed into a first helical groove 31 in the male thread portion 30b of the male threaded body 10, which will be described later. In this embodiment, the first female thread portion 11 is formed with the first helical rib 12 which is a right-handed thread 11a, but the first female thread portion 11 is not limited to a right-handed thread.

[0032] It is sufficient that at least a portion of the insertion portion 6 is formed so as to be able to be accommodated in the accommodation portion 5, and that the insertion portion 6 is configured so as to be able to relatively advance and retreat within the accommodation portion 5.

[0033] The positioning portion 3d is in the form of a protrusion, and is formed so as to come into contact with the wall portion 2e of the groove portion 2d of the first clamping body 2. As described above, the positioning portion 3d comes into contact with the wall portion 2e constituting the groove portion 2d, and determines the positions of the first clamping body 2 and the second clamping body 3.

[0034] In this embodiment, the groove portion 2d is formed in the first clamping body 2, and the positioning portion 3d is formed in the second clamping body 3, but this is not limited to the above. For example, the positioning portion 3d may be formed in the first clamping body 2. Also, it is not necessarily required to provide the groove portion 2d and the positioning portion 3d in the clamping device 1.

[0035] 6 is a diagram showing a male-threaded body 10, which has a head 20 and a shank 30. The head 20 is provided at one end of the shank 30, and has a larger outer diameter than the shank 30. Of course, the outer diameter shape of the head 20 is not limited to this, and it may have an irregular recess recessed into the top surface of the head in the shape of a so-called cap bolt.

[0036] The shaft portion 30 is provided with a cylindrical portion 30a and a male thread portion 30b. The male thread portion 30b has a first spiral groove 31 set with an appropriate lead angle and / or lead direction formed on the outer circumferential surface of the shaft portion 30. In this embodiment, the male thread portion 30b has the first spiral groove 31 formed as a right-handed thread, but the male thread portion 30b is not limited to a right-handed thread.

[0037] The clamping device 1 of this embodiment is configured by accommodating the insertion portion 6 of the second clamping body 3 in the accommodation portion 5 of the first clamping body 2 as shown in Fig. 7(A), and then inserting the male screw body 10 into the insertion hole 2c of the first clamping body 2 and screwing it into the first female screw portion 11 as shown in Fig. 7(B). In addition, the male screw body 10 can be rotated in the tightening direction to regulate the relative displacement between the first clamping body 2 and the second clamping body 3 and clamp the clamped body P. That is, by tightening the male screw body 10, the second clamping body 3 is screwed in the axial direction, while the first clamping body 2 abuts against the seat surface of the head 20 to restrict the axial displacement, so that the distance between the first clamping body 2 and the second clamping body 3 is narrowed, and the clamped body P can be clamped between the first clamping portion 2a and the second clamping portion 3a.

[0038] As described above, according to the clamping device 1 of this embodiment, the first clamping body 2 has the accommodation portion 5 capable of accommodating the insertion portion 6 of the second clamping body 3, and is configured so that the insertion portion 6 can be advanced and retreated within the accommodation portion 6 by relatively screwing the male threaded portion 30b of the male threaded body 10 and the first female threaded portion 11 of the second clamping body 3. As a result, when a shear force acts on the boundary surface between the first clamping body 2 and the second clamping body 3, the shear force can be received by the outer circumferential surface of the insertion portion 6. In addition, the first clamping body 2 including the accommodation portion 5 and the second clamping body 3 including the insertion portion 6 are integrated, which makes it possible to increase the rigidity against the shear force. Therefore, compared to a clamping device not having this configuration, the clamping device 1 of this embodiment can increase rigidity against shear forces, suppress fatigue fracture of the male-threaded body, and prevent loosening, thereby maintaining the fastened state for a long period of time, even if the diameter of the male-threaded body 10 is made smaller. Furthermore, even when the male threaded body 10 is removed from the clamping device 1 during work such as replacing the clamped object P, the insertion portion 6 of the second clamping body 3 remains accommodated in the accommodation portion 5 of the first clamping body 2, so separation of the first clamping body 2 and the second clamping body 3 can be prevented, and it is possible to prevent, for example, either the first clamping body 2 or the second clamping body 3 from falling.

[0039] [Modification of the first embodiment] 8 shows a clamping device 1 according to a modified example of the first embodiment, where (A) is a diagram showing each component, and (B) is a cross-sectional view showing the assembled state. The clamping device 1 comprises a first clamping body 2, a second clamping body 3, and a male threaded body 10. The clamping device 1 clamps a clamped object P located between the first clamping body 2 and the second clamping body 3 by tightening the male threaded body 10.

[0040] The clamping device 1 of the first embodiment differs from the clamping device 1 of the first embodiment in that the first clamping body 2 has an insertion portion 16, and the second clamping body 3 has a storage portion 15. In the modified example of the first embodiment, the same components as those described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0041] The first clamping body 2 has a first clamping portion 2a and an insertion hole 2c into which the male screw portion 30b can be inserted, and has an insertion portion 16 that can be accommodated in the accommodation portion 15 of the second clamping body 3. The insertion portion 16 has a hollow cylindrical shape extending toward the second clamping body 3 in the X-axis direction, and is connected to the insertion hole 2c.

[0042] The second clamping body 3 has a second clamping portion 3a and a housing portion 15 capable of surrounding the insertion portion 16. The second clamping body 3 further has a first female screw portion 11 formed with a first helical thread 12 that is coaxial with the insertion hole 2c of the first clamping body 2 and can be screwed into the first helical groove 31. Therefore, the clamping device 1 can be configured so that the insertion portion 16 can be advanced and retreated within the accommodation portion 15 by screwing the male thread portion 30b and the first female thread portion 11 relative to each other.

[0043] As a result, when a shear force acts on the boundary surface between the first clamping body 2 and the second clamping body 3 that constitute the clamping device 1, the shear force can be received by the outer circumferential surface of the insertion portion 16.

[0044] [Second embodiment] 9 is a perspective view showing a clamping instrument 100 according to a second embodiment. The clamping instrument 100 according to the second embodiment will be described. As in the first embodiment, the clamping instrument 100 can be generally applied to clamping an object P, and there is no limitation on the object to be clamped. The same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof will be omitted.

[0045] In the second embodiment, the clamping device 100 includes a first clamping body 2, a second clamping body 3, an externally threaded body 110, and an internally threaded body 50. The clamping device 100 clamps a clamped body P located between the first clamping body 2 and the second clamping body 3 by tightening the externally threaded body 110. Furthermore, the internally threaded body 50 is used to prevent the externally threaded body 110 from loosening.

[0046] The clamping device 100 differs from the clamping device 1 of the first embodiment in that it uses an externally threaded body 110 (see Figure 10) in which right-handed and left-handed threads are formed overlapping within the same region on the outer peripheral surface of the shaft, and in that the insertion portion 6 of the second clamping body 3 is provided with an internally threaded body 50 in which a first internally threaded portion 11 that can be screwed into either the right-handed thread 131a or the left-handed thread 131b of the externally threaded body 110 is formed, and a second internally threaded portion that can be screwed into the other of the right-handed thread 131a or the left-handed thread 131b of the externally threaded body 110 is formed.

[0047] 10 shows a male-threaded body according to a second embodiment, (A) being a front view, and (B) being a plan view showing the male-threaded portion in both spiral groove regions. The male-threaded body 110 has a head 120 and a shank 130. The head 120 is provided at one end of the shank 130, and has a larger outer diameter shape than the shank 130. Of course, the outer diameter shape of the head 120 is not limited to this, and it may have an irregular recess recessed into the top surface of the head in the shape of a so-called cap bolt.

[0048] The shaft portion 130 is provided with a cylindrical portion 130a and a male thread portion 130b. The male thread portion 130b has an overlapping region W in which two types of male thread spiral grooves, a first spiral groove 133a which is a right-handed thread 131a and a second spiral groove 133b which is a left-handed thread 131b, are overlapped on the outer circumferential surface of the shaft portion 130. Therefore, the male thread portion 130b can be screwed into either a right-handed or left-handed female-threaded body.

[0049] As shown in FIG. 10(B), in the male thread portion 130b, threads G each having a roughly crescent-shaped stripe shape extending circumferentially in a surface direction perpendicular to the axis (screw axis) C are alternately provided on one side (the right side of the figure) and the other side (the left side of the figure) in the diameter direction of the male thread portion 130b. That is, the ridge of this thread G extends perpendicularly to the axis, and the height of the thread G varies so that it is higher at the circumferential center and gradually decreases at both circumferential ends. Therefore, the height of the thread G is lower in a portion having a phase difference of 90° in the circumferential direction from the point where the thread height is the highest.

[0050] In addition, the crest height is zero in the circumferentially 180° phase difference portion. By configuring the thread G in this manner, two types of helical grooves can be formed between the threads G: a virtual helical groove structure that turns clockwise and a virtual helical groove structure that turns counterclockwise.

[0051] Furthermore, the male thread portion 130b is not necessarily limited to forming right-handed and left-handed threads, but may have a first spiral groove 133a set at an appropriate lead angle and / or lead direction, and a second spiral groove 133b set at a lead angle and / or lead direction different from that of the first spiral groove 133a. For example, the first spiral groove 133a and the first spiral rib 12, and the second spiral groove 133b and the second spiral rib 54, which have the same lead direction (L1, L2) but different lead angles, may be adopted. In this case, as shown in Fig. 11, a spiral groove with a different lead angle is further superimposed on the first spiral groove 133a, so that the first spiral groove 133a with a lead of L1 (lead angle α1) and the second spiral groove 133b with a lead of L2 (lead angle α2) are formed with the same screw direction. In this case, the first thread G1 of the first spiral groove 133a and the second thread G2 of the second spiral groove 133b are not shared but are separate. For details of the male screw portion 130b in which the two types of male screw helical structures are formed, please refer to Japanese Patent No. 4663813 invented by the inventor of the present application.

[0052] Next, the second clamping body 3 will be described. As shown in Fig. 12, an insertion portion 6 that can be accommodated in the accommodation portion 5 of the first clamping body 2 is formed on one side of the main body portion 3b of the second clamping body 3. In addition, a guide portion 7 that allows the female threaded body 50 to be attached and detached is formed on the other side of the main body portion 3b.

[0053] 12, the guide portions 7 are formed to face both sides in the Y direction of an insertion hole 3c formed in the main body portion 3b of the second clamping body 3. The guide portion 7 has a groove 7a having a generally U-shaped cross section so that the guide portion 7 can be sandwiched by an engagement portion 55a of the female threaded body 50 described later. The recessed groove 7a has an open mouth 7b on the upper side (upper side in the Z-axis direction), and allows the female threaded body 50 to be disposed at a predetermined position along the recessed groove 7a from the open mouth 7b.

[0054] By providing the guide portion 7, the female threaded body 50 can be detachably attached (exterior mounted) to the guide portion 7 on the outside of the second holding body 3. By making the female threaded body 50 a separate body from the second holding body 3, it is possible to reduce processing costs and facilitate replacement when the female threaded body 50 is damaged, etc.

[0055] The opening 7b of the guide 7 is preferably provided on the upper side (upper side in the Z-axis direction) of the main body 3b, but is not limited thereto. For example, the opening 7b of the guide 7 may be provided on the side (Y-axis direction) of the main body 3b.

[0056] In this embodiment, the guide portion 7 is used to make the female threaded body 50 detachable. However, the female threaded body 50 may be provided on the second clamping body 3 without using the guide portion 7. For example, the female threaded body 50 may be fixed to the second clamping body 3 by welding, or the female threaded body 50 and the second clamping body 3 may be processed as an integrated body.

[0057] The female-threaded body 50 will now be described. Fig. 13 shows the female-threaded body 50, with (A) being a front view, (B) being a rear view, (C) being a side view, and (D) being a cross-sectional view taken along the line AA in (A). In plan view, the female-threaded body 50 is made of a plate-like member 55 having a substantially rectangular shape with a short side portion 50a and a long side portion 50b, and a through hole 51 is formed in the substantially central portion. In addition, a second female-threaded portion 53 (see Fig. 13(C)) that can be screwed into the left-handed thread 131b of the male-threaded portion 130b of the male-threaded body 110 is formed in one end edge of the through hole 51.

[0058] The plate-like member 55 has a locking portion 55a formed with a generally U-shaped cross section on the side opposite to the side on which the second female screw portion 53 is formed (see FIG. 13(C)). The locking portion 55a is engaged with the recessed groove 7a of the guide portion 7 of the second clamping body 3 (see FIG. 13(B)).

[0059] The second female threaded portion 53 can be formed by plate pieces 52. Specifically, six elastic plate pieces 52 each having a substantially arc-shaped tip portion 52a are disposed on the through hole periphery that borders the entire circumference of the through hole 51. The tip portions 52a of these plate pieces 52 each protrude at an angle toward the axis C of the second female threaded portion 53, and are arranged in a virtual left-handed spiral shape as a whole. In this embodiment, the number of plate pieces 52 is set to six, but it is sufficient that the number is one or more.

[0060] In addition, the radially outer portion of the plate piece 52 is fixed to the periphery of the through hole 51, and the radially inner portion of the plate piece 52 is made a free end, and this free end side is configured to bend in only one direction from the steady position toward the direction of tightening the male threaded body 110.

[0061] The width, inclination angle, and position of the six plate pieces 52 are set so as to match the pitch, outer diameter, and valley diameter of the second spiral groove 133b, which is the left-handed thread 131b of the male-threaded body 110, and the tip shape of the plate pieces 52 is formed into an arc that forms a left-handed spiral. That is, the second female-threaded portion 53 of the female-threaded body 50 is formed with a second helical thread 54 of an intermittent helical left-handed thread that can be screwed into the second helical groove 133b of the male-threaded body 110. In this embodiment, the intermittent helical thread is formed by six plate pieces 52, but the present invention is not limited to this. For example, a continuous helical thread may be formed by one plate piece 52.

[0062] The width of the plate piece 52 is set to the difference between the outer diameter and the root diameter of the left-handed thread 131b of the male-threaded body 110. The installation inclination angle is set corresponding to the ratio of the pitch to the outer diameter of the left-handed thread 131b of the male-threaded body 110. Here, the outer diameter of the right-hand thread 131a and the outer diameter of the left-hand thread 131b of the male-threaded body 110, and the root diameter of the right-hand thread 131a and the root diameter of the left-hand thread 131b are set to be equal, but they can also be set to be different.

[0063] In other words, the radial inclination of the plate piece 52 from the through hole 51 of the plate-shaped member 55 arranged perpendicular to the axis of the first female thread portion 11 is set so that T ≒ tan θ, where θ is the inclination angle from a plane perpendicular to the axis of the first female thread portion 11 and T is the ratio of the pitch PL to the outer diameter of the left-handed thread 131b of the male-threaded body 110. In other words, when the lead angle of the first helical rib 12 on the inner peripheral surface of the first female thread portion 11 is taken as α, the angle is set to approximately θ=(180-2α)°±15°. The positions of the plate pieces 52 are set to correspond to the pitch PL of the left-handed thread 131b of the male-threaded body 110, so that the plate pieces 52 are in a positional relationship in which they mesh with the left-handed thread 131b. When a plurality of plate pieces 52 are provided, they can be arranged so as to be staggered with respect to each other.

[0064] The procedure for mounting the female-threaded body 50 to the second holding body 3 is as follows: first, the locking portion 55a of the female-threaded body 50 is opposed to the guide portion 7 along the Z direction as shown in Fig. 14(A). Then, the locking portion 55a is fitted into the guide portion 7 along the Z direction to mount the female-threaded body 50 to the second holding body 3. That is, the locking portion 55a is inserted into the groove 7a as shown in Fig. 14(B), and the female-threaded body 50 is positioned at the innermost position of the guide portion 7 (groove 7a) as shown in Fig. 14(C), thereby mounting the female-threaded body 50 to the second holding body 3. The female-threaded body 50 can be removed from the second holding body 3 by sliding the anti-rotation member 30 in the opposite direction to that in which it was attached.

[0065] The position of the axis of the through hole 51 of the female threaded body 50 attached to the second holding body 3 is located on a substantially extended line of the axis of the insertion hole 3c. Therefore, the female threaded body 50 can be screwed into the male threaded body 110 that is screwed into the first female threaded portion 11 of the second holding body 3. Note that the female threaded body 50 does not rotate together with the male threaded body 10 that screws in, because the locking portion 55a engages with the guide portion 7 and rotation around the axis is restricted.

[0066] Furthermore, when the male-threaded body 110 is inserted into the insertion hole 2c and rotated in the tightening direction (clockwise direction), the male-threaded portion 130b screws into the first female-threaded portion 11. Furthermore, as the male-threaded body 110 is tightened, the plate pieces 52 of the second female-threaded portion 53 engage with the threads of the male-threaded body 110 and elastically deform to allow the male-threaded body 110 to screw forward. That is, since the plate pieces 52 are arranged in a virtual left-handed spiral shape, when the male-threaded body 110 is rotated in the tightening direction relative to the first female-threaded portion 28, the plate pieces 52 engage with the threads of the male-threaded body 110 and their free ends on the radial center side bend and expand in diameter toward the advancing direction of the male-threaded body 110.

[0067] When each plate piece 52 is released from the engaged state with the thread, it contracts due to its elastic restoring force. That is, when each plate piece 52 is screwed to a required position (a position away from the right-handed thread 131a) in the male-threaded portion 130b of the male-threaded body 110, the plate piece 52 returns to its original position due to its elastic restoring force and engages with the left-handed thread 131b of the male-threaded body 110, so that each plate piece 52 and the left-handed thread 131b are aligned with each other. Each plate piece 52 aligned with the left-handed thread 131b of the male-threaded body 110 does not bend in the direction opposite to the moving direction of the male-threaded body 110 (the moving direction when the male-threaded body 110 is loosened). Alternatively, the plate pieces 52 are provided so as to be extremely difficult to bend.

[0068] By simply attaching such a second female threaded portion 53 to the second clamping body 3 and screwing the male threaded body 110 having two types of male thread spiral structures into the first female threaded portion 11 and the second female threaded portion 53, it is possible to prevent the male threaded body 110 from loosening. For example, when the clamped object P vibrates or the clamping tool 100 vibrates due to the application of an external force such as an earthquake, there is a risk that this vibration will also apply a counterclockwise torque to the first female thread portion 11 of the clamping tool 100.

[0069] In this case, when a left-handed torque is applied to the first female threaded portion 11, as shown in Figure 15, a force in the opposite direction to the direction of advancement during screwing is applied to the second clamping body 3 itself. However, since the plate pieces 52 are aligned with the left-handed threads 131b of the male-threaded body 110 and do not bend in the opposite direction, a force that tends to advance in the direction of advancement of the left-handed thread, i.e., the direction of advancement during screwing (towards the head 120 of the male-threaded body 110), is applied to each plate piece 52 on which the left-handed torque is applied.

[0070] In other words, the force tending to move the right-handed first helical thread 12 formed on the inner surface of the insertion hole 3c of the second clamping body 3 backward and the force tending to move the plate pieces 52 fixed to the second clamping body 3 forward are counterbalanced, and as a result, the second clamping body 3 stops at a given fixed position on the overlap region W of the male-threaded body 110. That is, in the screw-engaged combination of the male-threaded body 110 of this embodiment and the first female-threaded portion 11 of the second clamping body 3, the second clamping body 3 either advances or stops, and does not retreat. Therefore, the male-threaded body 110 cannot screw forward in the loosening direction relative to the first threaded portion 11. In other words, the female-threaded body 50 of the second embodiment can restrict the male-threaded body 110 from loosening.

[0071] [Modification of the second embodiment] 16 and 17 are diagrams showing a modified version of the second embodiment of the female-threaded body 50. The difference from the second embodiment is that the shape of the locking portion 55b of the female-threaded body 50 is different, and that the shape of the guide portion 70 corresponds to the shape of the locking portion 55b. In other words, the female-threaded body 50 is mounted (interiorly mounted) on the inside surrounded by the guide portion 70 so that the female-threaded body 50 is embraced by the guide portion 70. In addition, the number of plate pieces 52 constituting the second female thread portion 53 is different from that of the first embodiment. In this embodiment, the same components as those in the second embodiment are denoted by the same reference numerals as in the second embodiment, and detailed description thereof will be omitted.

[0072] As shown in FIG. 16, a locking portion 55b having a generally U-shaped cross section is formed on the short side portion 50a of the plate-shaped member 55 toward the side on which the second female threaded portion 53 is formed. A single elastic plate piece 52 having a substantially arc-shaped tip portion 52a is disposed on the through hole periphery that borders the entire circumference of the through hole 51. The tip portion 52a of this plate piece 52 protrudes at an angle toward the axis C of the second female threaded portion 53. A continuous helical thread is formed by this single plate piece 52. That is, the second female threaded portion 53 of the female threaded body 50 has a second helical thread 54 of a continuous left-handed thread that can be screwed into the second helical groove 133b of the male threaded body 110.

[0073] Next, the guide portion 70 will be described. As shown in Fig. 17, the guide portion 70 is provided on both sides of the insertion hole 3c formed in the main body portion 3b of the second clamping body 3, facing each other. The guide portion 70 is provided to protrude at a position corresponding to the position of the locking portion 55b of the female-threaded body 50 when the female-threaded body 50 is disposed, and has a substantially U-shaped cross section that holds the locking portion 55b by sandwiching it. The guide portion 70 is formed of a recessed groove 70a with an opening 70b on the upper side (upper side in the Z-axis direction), and allows the female-threaded body 50 to be disposed at a predetermined position along the recessed groove 70a from the opening 70b.

[0074] Here, both ends of the female threaded body 50 are provided with U-shaped locking portions 55b, and are elastically inserted into the recessed groove 70a, but the present invention is not limited thereto, and the both ends may be flat instead of U-shaped, or may be tapered. Also, the U-shape may be formed in a substantially U-shaped cross section, facing in the opposite direction to the side where the second female threaded portion 53 is formed. Specifically, the female threaded body 50 is inserted into the guide portion 70 from the opening 70b while being slid from the upper side (upper side in the Z-axis direction) in a state where it is overlapped on the surface of the main body portion 3b. As a result, the female threaded body 50 is held in a predetermined position with both sides and the outer edge of the lower side of the female threaded body 50 sandwiched between the recessed groove 70a of the guide portion 70.

[0075] [Third embodiment] FIG. 18 shows a clamping device 300 according to a third embodiment, in which (A) is a cross-sectional view of the first clamping body 2, the second clamping body 3, the male threaded body 110, and the female threaded body 310 separated, and (B) is a cross-sectional view of the various parts assembled. It is. In the third embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals as those in the first and second embodiments, and detailed description thereof will be omitted. As shown in Fig. 18(A), the clamping device 300 includes a first clamping body 2, a second clamping body 3, a male threaded body 110, and a female threaded body 310. The clamping device 300 can clamp a clamped body between the first clamping body 2 and the second clamping body 3 by tightening the male threaded body 110. Furthermore, the female threaded body 310 is used to prevent the male threaded body 110 from loosening.

[0076] The female-threaded body 310 is a so-called nut having a cylindrical shape and has a second female-threaded portion 313 as a left-handed screw. That is, the female-threaded body 310 has a second helical rib of a left-handed screw on the inner peripheral surface of the through hole 311, and the second helical rib can be screwed into the second helical groove 133b of the male-threaded body 110.

[0077] The first female thread portion 11 of the second clamping body 3 has a first right-handed helical thread 12 for screwing into the first helical groove 133 a of the male-threaded body 110 . Here, the second clamping body 3 having a first female thread portion 11 that screws into the right-handed thread in the male thread portion 130b of the male threaded body 110, and the female threaded body 310 having a second female thread portion 313 that screws into the left-handed thread in the male thread portion 130b of the male threaded body 110 form a so-called double nut structure.

[0078] Of course, the male thread portion 130b is not necessarily limited to forming right-handed and left-handed threads, but may have a first spiral groove 133a set at an appropriate lead angle and / or lead direction, and a second spiral groove 133b set at a lead angle and / or lead direction different from that of the first spiral groove 133a.

[0079] In this embodiment, by adopting a double nut structure, the second holding body 3 and the female threaded body 310 cannot loosen unless they rotate relative to each other. That is, as shown in Fig. 18(B), the first holding body 2 and the second holding body 3 are assembled, the male threaded body 110 is screwed into the first female threaded portion 11, and the female threaded body 310 is screwed into the tip side of the male threaded body 110, thereby preventing the second holding body 3 from loosening relative to the male threaded body 110. Regarding the point that rotational loosening cannot occur unless there is relative rotation, please refer to Japanese Patent No. 7014395 to the inventor of the present application for details of the principle.

[0080] [Modification of the third embodiment] Figure 19 illustrates the transition of the relative rotation state of a relative rotation suppression structure related to a modified example of the third embodiment, where (A) is a front view, (B) is a cross-sectional view taken along the line BB of (A), (C) is a front view, (D) is a cross-sectional view taken along the line DD of (C), (E) is a front view, and (F) is a cross-sectional view taken along the line FF of (E).

[0081] In a clamping device 500 which is a modification of the third embodiment, a relative rotation suppression structure 8 is provided between the second clamping body 503 and the female threaded body 550. It becomes possible to reliably suppress relative rotation between the second clamping body 503 and the female threaded body 550. Note that other parts and members of this modification, excluding the relative rotation suppression structure 8, are similar to the other embodiments, and therefore description thereof will be omitted here.

[0082] <Relative rotation prevention structure> As shown in FIG. 19, the relative rotation prevention structure 8 includes an annular protrusion 505 formed on the second holding body 503 and an annular recess 552 formed on the female threaded body 550 for accommodating the annular protrusion 505 therein.

[0083] 20(A), the outer circumferential surface of the annular protrusion 505 of the second clamping body 503 is a tapered surface that expands or contracts in the radial direction K along the axial direction J. Here, the outer circumferential surface contracts in diameter toward the outside in the axial direction J (toward the internally threaded body 550).

[0084] As shown in FIG. 20B, a first (counter) displacement portion 540 that displaces in the radial direction K as it moves in the circumferential direction S is formed on the outer peripheral surface of the annular convex portion 505. When viewed from the axial direction, this first displacement portion 540 is a protrusion that protrudes outward in the radial direction K with respect to a partial arc M1 of a virtual regular circle M (virtual regular cone) that is coaxial with the center of rotation. Therefore, the curvature of the outer peripheral surface of the protruding portion of the first displacement portion 540 is smaller than the curvature of the virtual regular circle M. In addition, the center of curvature when the outer peripheral surface of the annular convex portion 505 is viewed from the axial direction is always located inside the outer peripheral surface (or inside the virtual regular circle M). That is, the curvature of the outer peripheral surface of the first displacement portion 540 is set so that the positive and negative are not reversed along the circumferential direction. 34, the outer peripheral surface of the annular convex portion 505 is convex radially outward or at least becomes a flat surface circumscribing the imaginary perfect circle M, so that it can come into close contact over the entire circumference with the second deformation allowance portion 560 that undergoes elastic-plastic deformation in the female-threaded body 550. As a result, the annular convex portion 505 and the annular concave portion 552 are mechanically structurally configured to have roughly equivalent convex and concave portions that fit together, so that relative rotation is structurally prevented and loosening of the fastened state can be prevented.

[0085] Each protrusion of the first displacement portion 540 occupies a phase range of 120° in the circumferential direction, and the three first displacement portions 540 are evenly arranged in the circumferential direction. As a result, when the annular convex portion 505 is viewed axially, it is in the form of a rounded equilateral triangle, and the imaginary boundary 540X between a pair of adjacent first displacement portions 540 is a linear plane. The present invention is not limited to this, and various shapes such as a rounded regular square or regular pentagon can be adopted.

[0086] The first displacement portion 540 extends in the axial direction J. The cross-sectional shape of the first displacement portion 540 in the axis-perpendicular direction is similar to that of the annular protrusion 505, being smaller at the tip end side and larger at the base end side. The outer circumferential length of the outer circumferential surface of the annular protrusion 505 is the largest R1 at the base end side, the smallest R3 at the tip end side, and R2 in between (R1>R2>R3). The partially arc-shaped outer surface of the first displacement portion 540 is displaced in the radial direction K as it moves in the circumferential direction S.

[0087] As shown in FIG. 21, the conical inner peripheral surface (cylindrical surface) of the annular recess 552 of the female-threaded body 550 is a regular circle shape, and is a tapered surface that expands or contracts in diameter in the radial direction K along the axial direction J. Here, the inner peripheral surface expands in diameter toward the second clamping body 503 side and is parallel to the outer peripheral surface of the annular protrusion 505. This inner peripheral surface is a smooth surface. The inner peripheral length of the inner peripheral surface is the largest E1 at the tip end, the smallest E3 at the base end, and E2 in between (E1>E2>E3). When these inner peripheral lengths E1, E2, and E3 are compared with the outer peripheral lengths R1, R2, and R3 of the outer peripheral surface of the annular protrusion 505, the following conditions are satisfied.

[0088] R1 ≥ E1 > R2 ≥ E2 > R3 ≥ E3 (see Figure 22)

[0089] 19(E) and (F), in a state where the annular convex portion 505 and the annular concave portion 552 are finally fitted together, the outer circumferential length of the annular convex portion 505 and the inner circumferential length of the annular concave portion 552 at the location where they coincide in the axial direction are substantially equal to each other. In other words, with this setting, the second deformation allowance portion 560 of the annular concave portion 552 cannot receive the first displacement portion 540 of the annular convex portion 505 unless it undergoes elastic deformation and / or plastic deformation (elasto-plastic deformation).

[0090] 23, the entire annular recess 552 becomes the second (thread body side) deformation-permitting portion 560. Therefore, by utilizing the fastening force generated when the second clamping body 503 and the female-threaded body 550 approach each other, the second deformation-permitting portion 560 is pressed against the first displacement portion 540 of the second clamping body 503, so that a portion of the second deformation-permitting portion 560 is deformed so as to be recessed radially outward, and this deformation creates the second (thread body side) displacement portion 555.

[0091] As shown in FIG. 23, a pair of created surfaces 562A, 562B that define the recessed shape of the second displacement portion 555 after deformation has a width in the radial direction K (is displaced). In addition, the created surfaces 562A, 562B extend in the axial direction J. On the surface of the second deformation-permitting portion 560, the second displacement portion 555 is created so as to extend over an axial range (region) of one pitch or more of the threaded body. As a result, when the female-threaded body 550 rotates once in the loosening direction, the effect of suppressing relative rotation can always be exerted in all phases. Specifically, it is preferable that the second displacement portion 555 is created so as to extend over an axial range of three pitches or more. This axial range (region) can also be defined as the axial interference distance between the second deformation-permitting portion 560 and the first displacement portion 540.

[0092] For details of the engagement mechanism to which the relative rotation suppression structure is applied, please refer to Japanese Patent No. 7014395, which is owned by the inventor of the present application.

[0093] [Fourth embodiment] A clamping device 600 of the fourth embodiment will be described with reference to a partial cross-sectional side view showing a reverse rotation prevention structure of a male-threaded body of the fourth embodiment in Fig. 24. As shown in Fig. 24, the clamping device 600 has a first clamping body 602 and a male-threaded body 610. The clamping device 600 clamps a clamped body located between the first clamping body 602 and a second clamping body 3 (not shown) by tightening the male-threaded body 610. Furthermore, by using a reverse rotation prevention structure for the threaded body, the male-threaded body 610 is prevented from loosening.

[0094] 24 shows a reverse rotation prevention structure for a threaded body according to a fourth embodiment. The reverse rotation prevention structure for a threaded body is configured to include a male threaded body 610 and an annular washer 690.

[0095] 25 shows a male-threaded body 610 used in a reverse rotation prevention structure, where (A) is a partial cross-sectional side view and (B) is a bottom view. The male-threaded body 610 has a head 620 and a shaft portion 630. A threaded body side seat portion 622 is formed at a portion corresponding to the lower part or base of the head 620. A cylindrical portion 630a and a male-threaded portion 630b are formed at the shaft portion 630. Of course, the cylindrical portion 630a is not essential.

[0096] A first receiving portion 660 is formed on one side of the washer 690 (the upper surface side in FIG. 24). This first receiving portion 660 faces the threaded body side seat portion 622, and a first engagement mechanism A is formed between them. When at least the threaded body side seat portion 622 attempts to rotate in a direction to loosen the male-threaded body 610 in a fastened state, this first engagement mechanism A causes the first receiving portion 660 and the threaded body side seat portion 622 to engage with each other, thereby preventing relative rotation between the first receiving portion 660 and the threaded body side seat portion 622 in the rotation direction.

[0097] A second receiving portion 670 is formed on the other side (the lower surface side in FIG. 24) of the washer 690. The second receiving portion 670 faces the first clamping body 602.

[0098] The first clamping body 602 is formed with a member side seat portion 682 facing the second receiving portion 670 of the washer 690. A second engagement mechanism B is formed between the member side seat portion 682 of the first clamping body 602 and the second receiving portion 670 of the washer 690. When at least the washer 690 attempts to rotate together with the male threaded body 610 in the loosening direction, the second receiving portion 670 and the member side seat portion 682 engage with each other in this second engagement mechanism B, thereby preventing relative rotation between the second receiving portion 670 and the member side seat portion 682 in the rotation direction.

[0099] When the male threaded body 610 attempts to rotate in the loosening direction due to the action of the first engagement mechanism A and the second engagement mechanism B, the relative rotation between the male threaded body 610 and the first clamping body 602 is restricted by the presence of the washer 690. As a result, the male threaded body 610 is prevented from loosening.

[0100] 24, as a first engagement mechanism A, threaded body side irregularities 624 are formed on the threaded body side seat portion 622 of the male-threaded body 610. The threaded body side irregularities 624 are formed in a sawtooth shape that is provided in a plurality of successive rows in the circumferential direction. The direction in which each of the threaded body side irregularities 624 extends, i.e., the direction in which the ridge lines extend, is the radial direction of the male-threaded body 610. As a result, the threaded body side irregularities 624 extend radially from the axis.

[0101] Furthermore, the threaded body side seat portion 622 is formed with a threaded body side tapered surface 626 that is inclined in the radial direction. This threaded body side tapered surface 626 is inclined so that the center side approaches the tip of the screw, resulting in a convex cone shape toward the tip side. More preferably, the threaded body side irregularities 624 described above are formed on this threaded body side tapered surface 626.

[0102] 26, as the first engagement mechanism A, a first receiving portion 660 of a washer 690 is formed with first receiving portion side irregularities 664 that engage with the threaded body side irregularities 624. The first receiving portion side irregularities 664 are formed in a sawtooth shape and are provided in a plurality of consecutive rows in the circumferential direction. The direction in which each of the first receiving portion side irregularities 664 extends, i.e., the direction in which the ridge lines extend, is aligned with the radial direction of the male-threaded body 610. As a result, the first receiving portion side irregularities 664 extend radially from the center of the through hole 52 of the washer 690.

[0103] Furthermore, preferably, the first receiving portion 660 is formed with a washer side tapered surface 666 that is inclined in the radial direction. The washer side tapered surface 666 is inclined so that the center side approaches the tip of the screw and forms a mortar shape, resulting in a cone shape that is concave toward the tip side. The washer side tapered surface 666 is formed with the first receiving portion side irregularities 664 described above.

[0104] As a result, when the male threaded body 610 is tightened, in the first engagement mechanism A, the threaded body side tapered surface 626 of the threaded body side seat portion 622 enters into the recess of the washer side tapered surface 666 of the washer 690, and the threaded body side concave / convex 624 and the first receiving portion side concave / convex 664 engage with each other.

[0105] 26, the distance of an outer wall 672 of a second receiving portion 670 of a washer 690 from the axis of the screw varies along the circumferential direction. Specifically, the outer wall 672 has a circular shape that is eccentric with respect to the axis of the screw (the center of the through hole 652).

[0106] 24, the member side seat portion 682 of the first clamping body 602 has an accommodating recess 684 for accommodating the second receiving portion 670 of the washer 690, and the inner wall of this accommodating recess 684 is also circular and eccentric with respect to the axis of the screw. The amount of eccentricity is the same for the second receiving portion 670 and the accommodating recess 684, and the diameter difference (extra clearance) between the second receiving portion 670 and the accommodating recess 684 is set to be smaller than the amount of eccentricity.

[0107] According to the reverse rotation prevention structure for the threaded body of the fourth embodiment, a first engagement mechanism A is formed between the threaded body side seat portion 622 and the first receiving portion 660 by interposing a washer 690, and a second engagement mechanism B is formed between the member side seat portion 682 and the second receiving portion 670. When the male threaded body 610 attempts to loosen, the male threaded body 610 is brought into a state of circumferential engagement with the first clamping body 602 by the restricting action of both the first engagement mechanism A and the second engagement mechanism B, and reverse rotation, i.e., loosening, is prevented. Therefore, a fastening state that does not loosen at all can be obtained even if vibration or the like occurs.

[0108] In this embodiment, the washer 690 is used, but the configuration of the washer 690 may be provided in the first clamping body 602. That is, the first clamping body 602 may be formed with the first receiving portion 660, and the first engagement mechanism A may be provided between the first receiving portion 660 and the screw body side seat portion 622.

[0109] In the above first to fourth embodiments, the clamping device is provided with a housing portion capable of housing the insertion portion, thereby making it possible to increase the rigidity against the shear force that may occur between the first clamping body and the second clamping body that constitute the clamping device. However, the clamping device may not have these configurations. For example, a clamping device for clamping a clamped object includes a male-threaded body (110, 610) having a male-threaded portion (130b) formed by forming a first helical groove (133a) set at an appropriate lead angle and / or lead direction and a second helical groove (133b) set at a lead angle and / or lead direction different from the first helical groove (133a) so as to overlap with the first helical groove (133a) in the same region on the outer circumferential surface of the shaft, and an insertion hole (2c) into which the first clamping portion (2a) and the male-threaded body (110, 610) can be inserted. The clamping device includes a first clamping body (602) having a second clamping portion (3a) and a first female threaded portion (11) formed with a first helical thread (12) that can be screwed into one of the first helical groove (133a) or the second helical groove (133b) of the male threaded body (110, 610), and a female threaded body (50, 550) having a second female threaded portion (53) formed with a second helical thread (54) that can be screwed into the other of the first helical groove (133a) or the second helical groove (133b) of the male threaded body (110, 610). The first female threaded portion (11) and the second female threaded portion (53) are screwed into the male threaded portion (130b) of the male threaded body (110, 610). The clamping device of this configuration can prevent the threaded body from loosening.

[0110] The components of the first to fourth embodiments described above can be combined with each other as long as there is no contradiction. In addition, the first clamping body, the second clamping body, the male threaded body, and the female threaded body constituting the clamping device in each embodiment can be made of metal materials such as iron-based materials and non-ferrous materials, resin materials, reinforced resin materials, or combinations of these materials.

[0111] Furthermore, the clamped object is not particularly limited as long as it can be clamped between the first clamping body and the second clamping body, and examples of the clamped object include various pipes for water supply, sewerage, gas, steam, various chemicals, oil, etc., beams, columns, diagonal braces, steel materials, reinforcing bars, wires, cables, wires, plate-shaped members, etc. that constitute buildings. The material of the clamped object includes metals and / or non-metals. Metals include pure substances such as aluminum, copper, silver, gold, iron, nickel, tungsten, titanium, and zinc, as well as mixtures and compounds containing these as components, such as alloys such as brass, stainless steel, and magnesium alloys. Non-metals include wood, plastic, paper, fire-retardant wood, plywood, stone, glass, ceramic, pottery, porcelain, rubber, natural resin, synthetic resin, concrete, asphalt, and composite materials of these. The clamped object may be either a conductive material or an electrically insulating material.

[0112] For example, as shown in Fig. 27(a), a substantially circular space 200 is created between the first clamping portion 2a and the second clamping portion 3a, and the shapes of the first clamping portion 2a and the second clamping portion 3a can be determined so as to cover the outer periphery of the clamped object having a substantially circular cross section and disposed in the space 200. As shown in Fig. 27(b), the first clamping portion 2a and the second clamping portion 3a may have a planar contact surface 210 so as to contact the clamped object on a flat surface to clamp it.

[0113] Furthermore, a pull-out piece may be provided on the female-threaded body 50 so that the female-threaded body 50 can be easily pulled out from the guide portion 70. For example, the female-threaded body 50 can be provided with a pull-out portion 150 as a pull-out piece at the upstream end in the mounting direction when mounted on the guide portion 70. The removal portion 150 is a portion bent with respect to the plate-like member 55 so as to protrude in the thickness direction of the plate-like member 55. The length by which the removal portion 150 protrudes is not particularly limited, and may be a length that protrudes forward in the axial direction beyond the guide portion 70, or may be a length that does not protrude forward beyond the guide portion 70. The removal portion 150 may extend in a direction parallel to the thickness direction, or may extend in a direction inclined with respect to the thickness direction.

[0114] Such an extraction portion 150 is provided so as to be disposed above the guide portion 70 when the internally threaded body 50 is inserted vertically downward into the second clamping body 3 and attached thereto, as shown in Fig. 28(A). Moreover, since the extraction portion 150 is exposed outside the guide portion 70, the internally threaded body 50 can be easily removed from the second clamping body 3 by pulling up the extraction portion 150, as shown in Fig. 28(B).

[0115] Furthermore, the clamping device 100 of the present invention is not limited to clamping a single object to be clamped, but may be capable of clamping a plurality of objects to be clamped P. For example, as shown in Fig. 29, the clamping device 100 may be used to clamp and hold two objects to be clamped P in an overlapping state. When the held object P is a plate-like member, the first clamping portion 2a and the second clamping portion 3a bring abutment surfaces having a plurality of projections and recesses on the surface into contact with the held object P. This may suppress sliding of the held object P against the first clamping portion 2a or the second clamping portion 3a. Of course, the shape of the abutment surface is not limited to the above, and may include a pair of projections and recesses, one or more grooves and / or stripes, a twill or flat pattern with fine projections and recesses or cuts, or the like. [Explanation of symbols]

[0116] 1,100,300,500,600... Clipping device, 2,602... First clamping body, 2a... First clamping part, 2b... Main body, 2c... Insertion hole, 2d... Groove, 2e... Wall, 3,50 3...Second clamping body, 3a...Second clamping part, 3b...Main body part, 3c...Insertion hole, 3d...Positioning part, 4...Connection part, 5,15...Accommodating part, 5a...Bottom surface, 5b...Inner peripheral wall part, 5 c ···Tip edge, 6,16···Insertion portion, 6b···Inner peripheral wall portion, 6c···Tip edge, 7,70···Guide portion, 7a,70a···Groove, 7b,70b···Opening, 8···Relative rotation suppression structure, 10,110,610···Malely threaded body, 11···First female thread portion, 11a···Right-handed thread, 12···First helical thread, 20,120,620···Head portion, 30,130···Shaft portion, 30a···Cylindrical portion, 3 0b... male thread portion, 31... first spiral groove, 50, 550... female thread body, 50a... short side portion, 50b... long side portion, 51... through hole, 52... plate piece, 52a... tip portion, 53... second female thread portion, 54... second spiral rib, 55... plate-shaped member, 55a, 55b... engaging portion, 130b... male thread portion, 131a... right-hand thread, 131b... left-hand thread, 133a... first spiral groove, 133b...second spiral groove, 505...annular convex portion, 540...first displacement portion, 552...annular concave portion, 555...second displacement portion, 560...second deformation allowance portion, 562A, 562B...formed surface, 652...through hole, 660...first receiving portion, 664...first receiving portion side concave / convex, 666...washer side tapered surface, 670...second receiving portion, 672...outer wall, 682...member side seat portion, 684...accommodation concave portion, 690...washer,

Claims

1. A clamping device that clamps a clamped object between a first clamping part and a second clamping part, A male-threaded body having a male-threaded portion with a helical groove formed on the outer circumferential surface of a shaft portion, The first clamping portion and the second clamping portion have an insertion hole into which the male threaded body is inserted, One of the first clamping portion and the second clamping portion has a substantially cylindrical insertion portion having an inner diameter larger than the outer diameter of the shaft portion of the male threaded body, and the other has a receiving portion in which at least a part of the insertion hole receives the insertion portion and communicates with the insertion hole, A clamping device characterized in that a helical thread capable of screwing into the male threaded body is formed on the inner surface of the insertion hole of the first clamping portion and / or the second clamping portion.

2. A first male thread spiral groove set at an appropriate lead angle and / or lead direction and a second male thread spiral groove set at a lead angle and / or lead direction different from that of the first male thread spiral groove are formed in a shaft portion of the male thread portion so as to overlap each other within the same region on the outer circumferential surface of the shaft portion, A female-threaded body having a first female-threaded helical rib that can be screwed into the first male-threaded helical groove is provided on the tip end side of the male-threaded body relative to the first clamping portion and the second clamping portion, The clamping device according to claim 1, characterized in that a second female thread helical groove capable of screwing into the second male thread helical groove is formed on the inner surface of the insertion hole of the first clamping portion and / or the second clamping portion.

3. The clamping device according to claim 2, characterized in that the female-threaded body has one or more plate pieces that are screwed into the male-threaded body and are arranged to protrude from a through hole toward an axis, and the tip portions of the plate pieces form intermittent or continuous spiral threads.

4. The first clamping portion has a guide portion that guides the female-threaded body so that it can be inserted and removed, The guide portion regulates rotation of the female-threaded body around an axial direction, 4. The clamping device according to claim 3, wherein the female-threaded body disposed in the guide portion communicates with each of the insertion holes of the first clamping portion and the second clamping portion and can be screwed into the male screw.

5. 5. The clamping device according to claim 4, wherein the guide portion has a recessed groove that supports a peripheral surface of the female-threaded body, and an opening that allows the female-threaded body to be displaced in a direction perpendicular to the axis.

6. 5. The gripping device according to claim 4, wherein the female threaded body is fitted to the exterior or interior of the guide portion.

7. 7. The internally-threaded body according to claim 4, further comprising a take-out portion located outside the guide portion.

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