Hijacking device

Abstract

To provide a sandwiching device which prevents reverse rotation of a screw body, for example, prevents rotation of the screw body in a direction such that the screw body is loosened to prevent looseness without fail.SOLUTION: A sandwiching device 1 sandwiches a sandwiched body P located between a pressing part 150 and a pressure receiving part 160. Each of a first female screw part in a first support part 122 and a second female screw part in a female screw body 140 is threadedly engaged with a male screw part of a male screw body 130.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Conventionally, when assembling temporary structures at construction, building, and civil engineering sites, etc., it has been common to fix each structural steel material by welding, bolt fastening, or a combination of welding and bolt fastening. However, in order to fix each of the above steel materials by welding, it is necessary to have a professional worker to perform the work, and the work itself takes time. Disassembly is also troublesome, and the cut steel materials often cannot be reused, etc. In the case of fastening with bolts, it takes time to align the hole positions of the bolts, and when the hole positions are misaligned, the holes have to be re-drilled, etc.

[0003] In order to improve these inconveniences, clamping fittings for temporary structures are known. By using this clamping fitting to clamp members such as steel materials, a temporary structure is assembled. For example, Patent Document 1 discloses a clamping fitting including a swallowing portion that sandwiches a steel material of a temporary structure, a tightening bolt that is attached to the upper part of the swallowing portion and fixes the steel material, and a receiving seat that is provided at the lower part of the swallowing portion and supports the bottom of the steel material.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in a clamping device that clamps a member by tightening a screw body, a reliable measure against loosening of the screw body is required.

Means for Solving the Problems

[0006] The present invention, for solving the aforementioned problems, is a clamping device for clamping an object to be clamped, positioned between a pressing portion and a pressure receiving portion, comprising: a main body having an opposing first support portion and a second support portion; a male screw body having a male screw portion formed by overlapping a first helical groove set at an appropriate lead angle and / or lead direction and a second helical groove set at a different lead angle and / or lead direction from the first helical groove within the same region on the outer circumferential surface of the shaft portion; and a female screw body that can be screwed into the male screw body, wherein the first support portion has a first female screw portion that can be screwed into either the first helical groove or the second helical groove of the male screw body; the second support portion has a pressure receiving portion that receives pressure from the pressing portion via the object to be clamped; the female screw body has a second female screw portion that can be screwed into the other of the first helical groove or the second helical groove of the male screw body; and the first female screw portion and the second female screw portion are each screwed into the male screw portion of the male screw body.

[0007] Furthermore, the clamping device of the present invention is characterized in that the female screw body has an annular projection, the first support portion has an annular recess on one end side of the first female screw portion, and when the first female screw portion and the second female screw portion are screwed into the male screw portion of the male screw body and joined together, the annular projection is configured to be accommodated in the annular recess.

[0008] Furthermore, the clamping device of the present invention has a convex insertion-side engaging portion on the outer circumferential surface of the annular projection and a convex receiving-side engaging portion on the inner circumferential surface of the annular recess, and when the annular projection is housed in the annular recess, the insertion-side engaging portion and the receiving-side engaging portion have at least one displacement portion, and the insertion-side engaging portion and the receiving-side engaging portion interfere with each other at the displacement portion, causing elastic deformation and / or plastic deformation.

[0009] Furthermore, the clamping device of the present invention is characterized in that the receiving-side engaging portion extends linearly with a component parallel to the receiving direction, and the insertion-side engaging portion extends linearly with a component perpendicular to the receiving direction, and / or the receiving-side engaging portion extends linearly with a component perpendicular to the receiving direction, and the insertion-side engaging portion extends linearly with a component parallel to the receiving direction.

[0010] Furthermore, the clamping device of the present invention is characterized in that the pressing portion is a cap body, and the cap body is rotatable relative to the tip of the male screw body.

[0011] Furthermore, the clamping device of the present invention is characterized in that the second support portion has a first concave seating surface with a substantially hemispherical inner surface that opens toward the first support portion, and the pressure receiving portion is composed of a pressure receiving surface provided on one end face side and a first spherical portion provided on the other end face side that corresponds to the first concave seating surface, the first spherical portion is arranged to slide and tilt toward the first concave seating surface, and the pressure receiving surface is located outward from the opening end of the first concave seating surface.

[0012] Furthermore, the clamping device of the present invention is characterized in that the pressure-receiving portion has a limiting portion extending radially outward between the pressure-receiving surface and the first concave seating surface, and the limiting portion abuts near the opening end of the first concave seating surface, thereby limiting the sliding and inclination of the first spherical portion to a predetermined range.

[0013] Furthermore, the clamping device of the present invention is characterized in that the first concave seating surface has a first insertion hole in its center, and the pressure-receiving portion has a second concave seating surface on the pressure-receiving surface whose inner surface is substantially hemispherical, and a second insertion hole is provided in the center of the second concave seating surface, and the fixing member is composed of a head having a second spherical portion corresponding to the second concave seating surface and a shaft portion inserted into the first insertion hole. [Effects of the Invention]

[0014] According to the clamping device of the present invention, it is possible to reliably prevent loosening by preventing reverse rotation of the screw body, for example, by preventing rotation in the direction that loosens the screw body. [Brief explanation of the drawing]

[0015] [Figure 1] (A) is a front view and (B) is a top view showing a clamping device according to one embodiment of the present invention. [Figure 2] This is a cross-sectional view taken along the arrow BB in Figure 1(B). [Figure 3] (A) is a front cross-sectional view and (B) is a bottom view showing the receiving side engagement portion in the annular recess provided in the first support portion of the main body. [Figure 4] (A) is a top view of the pressure-receiving section, (B) is a front view, (C) is an enlarged view of (A)B, and (D) is an enlarged view of (B)C. [Figure 5] (A) is a front view of the male screw body, (B) is a magnified view of both helical regions of (A), and (C) is a bottom view of the pressing portion. [Figure 6] This is a plan view showing the male thread portion in both helical groove regions. [Figure 7] (A) is a front view of the male screw body, (B) is a top view, and (C) is a cross-sectional view taken along the line AA in (B). [Figure 8] (A) is a front cross-sectional view of the first female thread portion, and (B) is a front cross-sectional view of the second female thread portion, which has the opposite spiral direction to the first female thread portion. [Figure 9] (A) to (C) are front views showing the relative rotational movement of the first female screw portion and the second female screw portion in the clamping device. [Figure 10] (A) through (C) are front views showing how to use the clamping device. [Figure 11] (A) through (C) are front views showing how to remove the object to be clamped from the clamping device. [Figure 12] This diagram illustrates the relative rotation suppression structure in the engaged state between the insertion-side engaging portion and the receiving-side engaging portion. [Figure 13]It is a partially enlarged perspective view showing a relative rotation suppression structure in an engaged state between an insertion-side engaging portion and a housing-side engaging portion. [Figure 14] It is a front view of a male screw body and a cap body according to a second embodiment. [Figure 15] It is a front cross-sectional view of a cap body. [Figure 16] It is a top view showing a ring member. [Figure 17] It is a front view showing a clamping device according to a third embodiment. [Figure 18] It is a front cross-sectional view showing a main body. [Figure 19] It is a front view showing a movable pressure-receiving body. [Figure 20] (A) and (B) are front views schematically showing the operation of a restricting portion. [Figure 21] It is a front cross-sectional view of a main body according to a modified example of a movable pressure-receiving body according to a third embodiment. [Figure 22] (A) showing a movable pressure-receiving body according to this modified example is a top view, (B) is a front view, and (C) is a front cross-sectional view. [Figure 23] (A) showing a fixing member is a front view, and (B) is a top view. [[ID=三十二]] [Figure 24] (A) and (B) are front cross-sectional views showing the operation of a movable pressure-receiving body. [Figure 25] It is a front cross-sectional view according to a modified example of a fastening structure of a male screw portion and a female screw portion of this embodiment. [Figure 26] It is a front view according to a modified example of a pressure-receiving portion of a clamping device. [Figure 27] It is a perspective view according to a modified example of a base portion of a clamping device. [Figure 28] It is a perspective view according to a modified example of a support portion of a clamping device. [Figure 29] (A) showing a clamping device including a set of a plurality of support portions having different clamping directions is a side view, and (B) is a front view.

Modes for Carrying Out the Invention

[0016] Hereinafter, with reference to the drawings, a clamping device 1 according to the first embodiment of the present invention will be described with reference to Figures 1 to 13. Note that the dimensions, materials, shapes, relative arrangements, etc., of the components described or shown in the drawings as embodiments are not intended to limit the scope of the present invention to the aforementioned content, but are merely illustrative examples. For example, expressions describing relative or unique arrangements such as "in a certain direction," "along a certain direction," "towards a certain direction," "parallel," "orthogonal," "perpendicular," "center," "concentric," or "coaxial" should not only strictly represent such arrangements, but also represent states of relative displacement with tolerances, or angles and distances sufficient to achieve the same function. For example, expressions describing things as being equal, such as "identical," "equal," "uniform," and "uniform density," should not only strictly represent states of equality, but also represent states where tolerances, or differences or ratios sufficient to achieve the same function exist. For example, expressions describing shapes such as triangular pyramids, cones, triangular prisms, and cylinders not only describe the geometrically precise shapes of triangular pyramids, cones, triangular prisms, and cylinders, but also, to the extent that the same effect is achieved, describe shapes that include concave and concave parts and chamfered parts. On the other hand, expressions such as "equipped with," "formed," "possessed," "possess," "include," or "have" a single component are not exclusive expressions that exclude the existence of other components.

[0017] Furthermore, in the drawings, the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system where appropriate. In the XYZ coordinate system, for convenience, the Z-axis direction is defined as the direction parallel to the axis direction of the central axis J of the male screw body 130 shown in Figure 1. The X-axis direction is the direction perpendicular to the Z-axis direction and is the left-right direction in Figure 1. The Y-axis direction is the direction perpendicular to both the X-axis and Z-axis directions. In addition, any direction in which the XY plane defined by the X and Y axes extends is referred to as the "horizontal direction".

[0018] Furthermore, in the following explanation, the Z-axis direction is defined as the up-and-down direction, the positive side of the Z-axis direction (+Z side) is referred to as the "upper side (upper Z-axis direction)," and the negative side of the Z-axis direction (-Z side) is referred to as the "lower side (lower Z-axis direction)." Also, the radial direction centered on the Z-axis is simply referred to as the "radial direction," and the circumferential direction (θ direction) centered on the Z-axis is simply referred to as the "circumferential direction." The X-axis direction is defined as the front-to-back direction (length direction), the positive side of the X-axis direction (+X side) is referred to as the "front," and the negative side of the X-axis direction (-X side) is referred to as the "rear." The Y-axis direction is defined as the width direction. Note that the terms radial direction, circumferential direction, up-and-down direction, upper side and lower side, front-to-back direction (length direction), front and rear, and width direction are merely descriptive terms and do not limit the actual positional relationships and directions.

[0019] In this specification, "extending" includes not only cases where the material extends strictly in the axial direction, but also cases where the material extends in a direction inclined to the axial direction by an angle of 45° or less. Furthermore, in this specification, "extending radially" includes not only cases where the material extends strictly in the radial direction, i.e., in a direction perpendicular to the Z-axis direction, but also cases where the material extends in a direction inclined to the radial direction by an angle of 45° or less.

[0020] In this embodiment, the clamping device 1 clamps the object to be clamped P, which is located between the pressing portion 150 and the pressure receiving portion 160, by tightening the male screw body 130. Furthermore, while the object to be clamped P is clamped, the female screw body 140 is used to prevent the male screw body 130 from loosening. Details will be explained below.

[0021] As shown in Figure 1, the clamping device 1 comprises a main body 120, a male threaded body 130, and a female threaded body 140.

[0022] The main body 120 has a base 121, a first support portion 122, and a second support portion 127. The first support portion 122 is formed extending forward (+X side) from the upper side (+Z side) of the base portion 121, and the second support portion 127 is formed extending forward (+X side) from the lower side (-Z side) of the base portion 121. The first support portion 122 and the second support portion 127 are substantially parallel to each other. Overall, the main body 120 is formed in a substantially U-shape that opens toward the front (+X side).

[0023] As shown in Figure 2, the first support portion 122 has a through hole 122a that penetrates in the Z-axis direction at its tip. The through hole 122a has a first female thread portion 123 and an annular recess 125, in that order from the upper side in the Z-axis direction.

[0024] As shown in Figure 8(A), the first female thread portion 123 has a first female thread spiral ridge 123a formed as a right-hand thread.

[0025] As shown in Figure 2, the annular recess 125 is formed on one end of the through hole 122a, facing the second support portion 127. As shown in Figure 3, the inner circumferential surface 125a of the annular recess 125 is inclined and is formed by expanding or contracting in the radial direction along the Z-axis direction. When the annular recess 125 is joined to the female screw body 140 shown in Figure 7, it is inclined so as to accommodate the annular projection 141b of the female screw body 140. In this embodiment, the inner circumferential surface 125a expands in diameter toward the downward side (-Z side) in the Z-axis direction. As shown in Figure 3(A), a plurality of receiving-side engaging portions 125b are formed on this inner circumferential surface 125a at equal intervals along the Z-axis direction. These receiving-side engaging portions 125b are formed in an annular band shape and are convex. The direction in which the convex shape of the receiving-side engaging portions 125b extends substantially coincides with the circumferential direction centered on the Z-axis.

[0026] This receiving-side engaging portion 125b can engage with the insertion-side engaging portion 142b of the female screw body 140 in the circumferential direction, and functions as a relative rotation suppression structure 30, which will be described later.

[0027] As shown in Figure 2, the second support portion 127 has a pressure-receiving portion 160 of a cylindrical base that protrudes toward the first support portion 122 at its tip. The pressure-receiving portion 160 receives the pressure from the pressing portion 150 via the clamping device P on the pressure-receiving surface 161 on the upper surface of the cylindrical base. Here, the pressure-receiving surface 161 is provided in a circular shape, but it goes without saying that it is not limited to a circular shape.

[0028] As shown in Figures 4(A) and 4(C), multiple square pyramidal projections 161a of the same shape are arranged at equal density on the pressure-receiving surface 161. In this way, the pressure-receiving surface 161 has irregularities formed by the multiple projections 161a. The vertex angle of the square pyramid is parallel to one side of the base passing through the vertex of the square pyramid, and is 90° in a cross section perpendicular to the pressure-receiving surface 161 (see enlarged view D). Note that the shape of the projections 161a formed on the pressure-receiving surface 161 is not limited to a square pyramid. Of course, the angle of the vertex is not limited to 90°. Other shapes of projections 161a may include pyramidal projections, conical projections, prismatic projections, hemispherical projections, etc.

[0029] Furthermore, the irregularities formed on the pressure-receiving surface 161 may be formed by arranging a plurality of independent recesses. In addition, although the plurality of protrusions 161a, which are irregularities, were arranged at equal density, the arrangement of the irregularities is not limited to this. The plurality of protrusions 161a may be arranged in a ring shape, or they may be arranged in a line in one direction and parallel to each other. Alternatively, they may be arranged in a close-packed manner, and the shape and arrangement of these protrusions 161a can be combined with each other.

[0030] Furthermore, the shape of the pressure-receiving section 160 is not limited to a cylindrical base; it may also be a square base, a star-shaped base, or the like. Also, the pressure-receiving section 160 does not need to be an integral structure with the first support section 122 of the main body 120; the pressure-receiving section 160 may be a separate component that can be attached to the first support section 122.

[0031] As shown in Figure 5, the male screw body 130 has a head 131 and a shaft portion 132. The head 131 is provided at one end of the shaft portion 132 and has a larger outer diameter shape compared to the shaft portion 132. Of course, the outer diameter shape of the head 131 is not limited to this, and it may have an irregularly shaped recess formed in the upper surface of the head in the manner of a so-called cap bolt. The shaft portion 132 of the male screw body 130 is provided with a male screw portion 133. The male screw portion 133 is composed of two helical groove regions W1 in which a first helical groove 133a set at an appropriate lead angle and / or lead direction, and a second helical groove 133b set at a different lead angle and / or lead direction from the first helical groove 133a are formed overlapping within the same region on the outer circumferential surface of the shaft portion 132 (see enlarged view of Figure 5).

[0032] As shown in Figures 5(A) and 5(B), in this embodiment, the male threaded portion 133 has two types of male threaded grooves formed in the same area: a first helical groove 133a which is a right-hand thread, and a second helical groove 133b which is a left-hand thread. Therefore, the male threaded portion 133 can be screwed into either a right-hand or left-hand threaded female thread body. Of course, the male threaded portion 133 is not necessarily limited to forming right-hand and left-hand threads; it may have a first helical groove 133a set with an appropriate lead angle and / or lead direction, and a second helical groove 133b set with a different lead angle and / or lead direction from the first helical groove 133a.

[0033] As shown in Figure 6, in both helical groove regions W1, threads G, which form approximately crescent-shaped strips extending circumferentially in a plane direction perpendicular to the axis (screw axis) C, are alternately provided on one side (right side in the figure) and the other side (left side in the figure) in the diametrical direction of the male thread portion 133. That is, the ridges of these threads G extend perpendicular to the axis, and the height of the threads G changes such that it is higher in the center in the circumferential direction and gradually decreases at both ends in the circumferential direction. Therefore, the thread height is lower in the portion that has a 90° phase difference in the circumferential direction from the point where the thread height of the thread G is highest. Note that the thread height is zero in the portion with a 180° phase difference in the circumferential direction. By configuring the threads G in this way, two types of helical grooves, a virtual helical groove structure that rotates clockwise and a virtual helical groove structure that rotates counterclockwise, can be formed between the threads G.

[0034] For details regarding the male screw portion 133, which has two types of male screw spiral structures, please refer to Japanese Patent Publication No. 4663813, issued by the inventor of this application.

[0035] The male threaded portion 133 may be composed only of the two helical groove regions W1, but is not limited to this. For example, it may be composed of the two helical groove regions W1 and a single helical groove region W2 in which either the first helical groove 133a or the second helical groove 133b is formed.

[0036] Returning to Figure 5(A), the pressing portion 150 is cylindrical and is provided at the other end of the shaft portion 132. The pressing portion 150 has a pressing surface 151 that presses against the object to be clamped P. As shown in Figure 5(C), multiple square pyramidal projections 151a of the same shape are arranged at equal density on the pressing surface 151. In this way, the pressing surface 151 has irregularities formed by the multiple projections 151a. The apex angle of the square pyramid is parallel to one side of the base passing through the apex of the square pyramid, and is 90° in a cross section perpendicular to the pressing surface 151. Note that the shape of the projections 151a formed on the pressing surface 151 is not limited to a square pyramid. Of course, the angle of the apex is not limited to 90°. It may be a pyramidal projection, a conical projection, a prismatic projection, a hemispherical projection, etc.

[0037] Furthermore, the irregularities formed on the pressing surface 151 may be formed by arranging multiple independent recesses. In addition, although the multiple protrusions 151a, which are irregularities, were arranged at equal density, the arrangement of the irregularities is not limited to this. The multiple protrusions 151a may be arranged in a ring shape, or they may be arranged in a line in one direction and parallel to each other. Alternatively, they may be arranged in a close-packed manner, and the shapes and arrangements of these protrusions 151a can be combined with each other.

[0038] The shape of the pressing portion 150 is not limited to a cylindrical shape; it may also be a rectangular prism, a star-shaped base, or the like. Furthermore, the end face of the tip portion 134 of the male screw body 130 may also serve as the pressing portion 150. The pressing portion 150 does not need to be an integral part of the male screw body 130; it may be a separate component that can be attached to the tip portion 134 of the male screw body 130.

[0039] As shown in Figures 7(A) and 7(B), the female threaded body 140 is nut-shaped and has a cylindrical portion 143. As shown in Figure 7(C), a second female threaded portion 141 is formed on the inner circumferential surface of the through hole 143a formed in the cylindrical portion 143. The second female threaded portion 141 has a second female threaded groove 141a that screws into either the first helical groove 133a or the second helical groove 133b of the male threaded body 130. In this embodiment, the second female threaded groove 141a is formed as a left-hand thread. Also, as shown in Figure 7(A), an annular projection 141b is formed on one end face of the female threaded body 140, projecting in a substantially frustoconical shape toward the upper side (+Z side) in the Z-axis direction. The outer circumferential surface 142a of the annular projection 141b is inclined and is formed by expanding or contracting in the radial direction along the Z-axis direction. The annular projection 141b of the female thread body 140 is inclined so as to be accommodated in the annular recess 125 of the first support portion 122 when it is joined to the first support portion 122 of the main body 120.

[0040] In this embodiment, the outer circumferential surface 142a of the annular projection 141b of the female screw body 140 tapers in diameter toward the upper side (+Z side) in the Z-axis direction. Multiple insertion-side engaging portions 142b are formed on this outer circumferential surface 142a. The insertion-side engaging portions 142b are formed in a band shape and are convex. The direction in which the convex shape of the insertion-side engaging portions 142b extends is set to align with the radial direction of the female screw body 140. As a result, the convex insertion-side engaging portions 142b on the outer circumferential surface 142a of the annular projection 141b extend radially from the axis (see Figure 7(B)). In this embodiment, 24 insertion-side engaging portions 142b are arranged at equal intervals with a relative phase difference of 15° in the circumferential direction. However, the arrangement phase difference and number of insertion-side engaging portions 142b, and the spacing at which the insertion-side engaging portions 142b are arranged are not limited thereto.

[0041] This insertion-side engaging portion 142b is capable of engaging with the receiving-side engaging portion 125b in the circumferential direction and functions as a relative rotation suppression structure 30, which will be described later.

[0042] Figures 8 and 9 omit the illustration of the relative rotation suppression structure for the sake of clarity and show a simplified representation.

[0043] As shown in Figure 8(A), a first female threaded groove 123a, which is a right-hand thread, is formed in the through hole 122a of the first female threaded portion 123 provided in the first support portion 122 of the main body 120. That is, the first female threaded groove 123a of the first female threaded portion 123 engages with the first helical groove 133a of the male threaded portion 133 of the male threaded body 130. As shown in Figure 8(B), a second female threaded groove 141a, which is a left-hand thread, is formed in the through hole 143a of the second female threaded portion 141 provided in the female threaded body 140. The second female threaded groove 141a engages with the second helical groove 133b of the male threaded portion 133 of the male threaded body 130.

[0044] Thus, when two types of first female threaded portions 123 and second female threaded portions 141, which have different lead angles and / or lead directions, are screwed onto the male threaded portion 133 of the male threaded body 130, for example, like a double nut, to clamp the object to be clamped P, rotational loosening is not possible unless the first female threaded portions 123 and second female threaded portions 141 rotate relative to each other. The principle of this will now be explained.

[0045] As shown in Figure 9(A), when attempting to rotate the first female thread portion 123, which is a right-hand thread, in the loosening direction Sa (clockwise when viewed from the head 131 side), the first female thread portion 123 attempts to screw in the direction Ja of the tip portion 134 of the male thread body 130. The second female thread portion 141, which is a left-hand thread and rotates together with the first female thread portion 123 in the Sa direction, attempts to screw in the direction Jb of the head 131 of the male thread body 130. Therefore, the first female thread portion 123 and the second female thread portion 141 interfere with each other in the axial direction, making loosening impossible.

[0046] On the other hand, as shown in Figure 9(B), when attempting to rotate the second female thread portion 141, which is a left-hand thread, in the loosening direction Sb (counterclockwise when viewed from the head 131 side), the second female thread portion 141 attempts to screw in the direction Ja of the tip portion 134 of the male thread body 130. The first female thread portion 123, which is a right-hand thread and rotates together with the second female thread portion 141 in the Sb direction, attempts to screw in the direction Jb of the head 131 of the male thread body 130. This direction Jb causes the male thread body 130 to rotate in the tightening direction, further clamping the clamped object P. Therefore, it interferes with the clamped object P already clamped by the male thread body 130 and cannot rotate any further. As a result, the second female thread portion 141 cannot be loosened.

[0047] In short, as shown in Figure 9(C), this double nut structure cannot be loosened by rotation unless the second female thread portion 141, which is a left-hand thread, is rotated independently in the loosening direction Sb without rotating the first female thread portion 123, or unless the second female thread portion 141 is rotated in the loosening direction Sb while the first female thread portion 123, which is a right-hand thread, is rotated in the opposite loosening direction Sa. In other words, relative rotation is an essential requirement for loosening the first female thread portion 123 and the second female thread portion 141. <Instructions on how to use the clamping device> Next, the method of using the clamping device 100 will be explained. First, as shown in Figure 10(A), the object to be clamped P is positioned between the pressing part 150 and the pressure receiving part 160. Then, the male screw body 130 is rotated with a predetermined torque in the direction indicated by arrow A, moving the pressing part 150 closer to the pressure receiving part 160 in the clamping direction.

[0048] As shown in Figure 10(B), the object to be clamped P is clamped by the pressing portion 150 and the pressure receiving portion 160 by tightening with the male screw body 130.

[0049] Then, the female threaded body 140 is rotated in the direction indicated by arrow A to join it to the first support portion 122. More specifically, the second female threaded portion 141 of the female threaded body 140 and the first female threaded portion 123 of the first support portion 122 are screwed into the male threaded portion 133 of the male threaded body 130 and joined together (see Figure 10(C)). This prevents the first female threaded portion 123 and the second female threaded portion 141 from rotating in a direction that would loosen them. The principle for preventing this loosening rotation is as described above.

[0050] Next, we will explain an example of how to remove the object to be clamped P from the clamping device 120.

[0051] Figure 11(A) shows the state in which the clamped object P is clamped by the pressing portion 150 and the pressure receiving portion 160 by tightening the male screw body 130. First, the male screw body 130 is rotated slightly in the direction indicated by arrow A, which is the tightening direction, relative to the first support portion 122 having the first female screw portion 123. As a result, the female screw body 140, which rotates together with the male screw body 130, moves away from the first support portion 122. This releases the connection between the female screw body 140 and the first support portion 122.

[0052] As shown in Figure 11(B), when the connection between the female thread body 140 and the first support portion 122 is released, the female thread body 140 is rotated in the direction indicated by arrow B and moved to a predetermined position toward the tip of the male thread body 130.

[0053] Figure 11(C) shows the female thread body 140 moved to a predetermined position on the male thread portion 133 of the male thread body 130. Then, the male thread body 130 is rotated in the direction indicated by arrow B. This allows the male thread body 130 to move away from the object to be clamped P, making it possible to remove the object to be clamped P from the clamping device 120. Alternatively, the female thread body 140 may be made to separate from the first support portion 122 and loosen when a sufficiently large loosening torque is applied to it.

[0054] In the state shown in Figure 11(A), if the male screw body 130 is rotated in a loosening direction relative to the first support part 122 having the first female thread portion 123, the first female thread portion 123 will attempt to screw in the direction Ja of the tip portion 134 of the male screw body 130. In other words, from the perspective of the first female thread portion 123, it can be said that the first female thread portion 123 is rotating clockwise. The second female thread portion 141, which rotates together with the first female thread portion 123, will attempt to screw in the direction Jb of the head portion 131 of the male screw body 130. Therefore, the first female thread portion 123 and the second female thread portion 141 interfere with each other in the axial direction, and loosening is not possible. This corresponds to the principle explained in Figure 9(A). <Relative rotation suppression structure> Here, the relative rotation suppression structure 30 will be explained. The insertion-side engaging portion 142b and the receiving-side engaging portion 125b interfere with each other in a direction perpendicular to the insertion direction id of the female screw body 140, causing elastic and / or plastic deformation. The receiving-side engaging portion 125b and the insertion-side engaging portion 142b are circumferentially engaged. The insertion-side engaging portion 142b is pressed against the receiving-side engaging portion 125b at the first support portion 122 of the main body 120 by the tightening of the female screw body 140. As a result, a part of it deforms so as to be recessed radially inward, and this deformation creates an insertion-side displacement portion 45 (see Figure 12). Note that in Figure 7, the state before fastening is shown, so the insertion-side displacement portion 45 has not been created.

[0055] The insertion-side engaging portion 142b of the female screw body 140 can be made of a softer material compared to the receiving-side engaging portion 125b of the first support portion 122 of the main body 120. In this case, the receiving-side engaging portion 125b, which interferes with the insertion-side engaging portion 142b, can actively deform the insertion-side engaging portion 142b. Alternatively, the insertion-side engaging portion 142b can be made with lower rigidity compared to the receiving-side engaging portion 125b. In this case, the insertion-side engaging portion 142b that abuts against the receiving-side engaging portion 125b can actively undergo elastic and / or plastic deformation.

[0056] In this embodiment, the entire body 120 is made of a high-strength material compared to the female thread body 140. In this case, the body 120 can be made of a material whose strength has been increased by adding additives to iron or by heat treatment. Furthermore, in this embodiment, the radial thickness of the annular recess 125 on the base 121 side of the first support portion 122 of the body 120 is made greater than the radial thickness of the annular projection 142b of the female thread body 140. As a result, the rigidity of the annular recess 125 is higher than that of the annular projection 141b.

[0057] In this embodiment, the insertion-side engaging portion 142b is made of a softer material than the receiving-side engaging portion 125b, but the receiving-side engaging portion may be made of a softer material. That is, a receiving-side displacement portion 40 may be provided. It is also preferable to use the same strength, the same rigidity, and the same material, so that the parts that are pressed against each other undergo the same deformation, thereby restraining each other's displacement and preventing loosening.

[0058] In Figure 13, a schematic representation shows a case where a strip-shaped insertion-side engagement portion 142b intersects with a single receiving-side engagement portion 125b to form a recess (insertion-side displacement portion 45). However, in reality, it may intersect with multiple receiving-side engagement portions 125b. Therefore, multiple insertion-side displacement portions 45 may be formed on each insertion-side engagement portion 142b. Intersection refers to a state in which the insertion-side engagement portion 142b and the receiving-side engagement portion 125b overlap in a manner in which they are in contact or pressed against each other at an angle other than parallel (an angle other than 0 degrees).

[0059] Returning to Figure 12, on the surface of the insertion-side engagement portion 142b, multiple insertion-side displacement portions 45 are created, extending over an axial range (region) W of one pitch or more of the female screw body 140. By forming the insertion-side displacement portions 45, which exert a relative rotation suppression effect, over a range extending over one pitch or more in the axial direction, the female screw body 140 can always exert a relative rotation suppression effect at all phases when it rotates once in the loosening direction. Specifically, it is preferable that they are created extending over an axial range of three pitches or more. This axial range (region) W can also be defined as the axial interference distance W between the receiving-side engagement portion 125b and the insertion-side engagement portion 142b.

[0060] Furthermore, when viewed from the axis of the annular projection 141b, multiple insertion-side displacement parts 45 are created in the circumferential direction, in this case at least 30 or more. In particular, if the insertion-side displacement parts 45 are formed at equal intervals (or at predetermined periodic intervals), the diametrical reaction forces when the multiple insertion-side displacement parts 45 deform cancel each other out, thereby suppressing the relative eccentric force acting between the first support part 122 of the main body 120 and the female screw body 140. As a result, it is possible to suppress so-called one-sided contact between the first support part 122 of the main body 120 and the female screw body 140 and the male screw body 130. Note that even if the circumferential arrangement interval of the multiple insertion-side displacement parts 45 is random, if there are many of them, the diametrical reaction forces will cancel each other out as a result.

[0061] Furthermore, the directions in which the receiving-side engaging portion 125b and the insertion-side engaging portion 142b extend may be opposite. That is, there are cases where the receiving-side engaging portion 125b is formed to extend linearly with a component parallel to the receiving direction and the insertion-side engaging portion 142b is formed to extend linearly with a component perpendicular to the receiving direction, and cases where the receiving-side engaging portion 125b is formed to extend linearly with a component perpendicular to the receiving direction and the insertion-side engaging portion 142b is formed to extend linearly with a component parallel to the receiving direction.

[0062] In this embodiment, an annular projection 141b is provided on the female threaded body 140, and an annular recess 125 is provided on the first support portion 122 of the main body 120. However, it is not necessarily required to provide the annular projection 141b and the annular recess 125. In this case, when the second female threaded portion 141 of the female threaded body 140 and the first female threaded portion 123 of the first support portion 122 are screwed into the male threaded portion 133 of the male threaded body 130 and joined together, an engagement mechanism may be provided with respect to the joint surface of the male threaded body 140 and the first support portion 122 to suppress relative movement between them. In this case, the engagement mechanism will be provided on the respective joint surfaces of the male threaded body 140 and the first support portion 122. For details of the engagement mechanism to which the relative movement suppression structure is applied, please refer to Japanese Patent No. 7014395 by the inventor of this application. [Second Embodiment] Figure 14 is a front view of the male screw body 230 and the cap body 250.

[0063] A clamping device 1, which is a second embodiment of the present invention, will now be described. The difference from the first embodiment is that the cap body 250 is given the function of a pressing portion 150, and the cap body 250 is configured to be rotatable at the tip portion 234 of the male screw body 230. In the second embodiment, components similar to those in the first embodiment are denoted by the same reference numerals as in the first embodiment, and detailed descriptions are omitted.

[0064] As shown in Figure 14, the male threaded body 230 has an annular groove (hereinafter referred to as the first annular groove) 234a formed on the outer circumference of the tip portion 234 of the shaft portion 132. The cap body 250 is rotatably mounted on the tip portion 340 of the male threaded body 230. The cap body 250 has a pressing surface 151 that presses against the object to be clamped P.

[0065] As shown in Figure 15, the cap body 250 has a concave shape and is composed of an inner circumferential surface 253 and an inner bottom surface 258. An annular groove (hereinafter referred to as the second annular groove) 255 is formed on the inner circumferential surface 253 of the cap body 250. A projection 151a is provided on the pressing surface 151, similar to the first embodiment. When the cap body 250 is attached to the tip 234 of the male screw body 230, the first annular groove 234a of the male screw body 230 and the second annular groove 255 of the cap body 250 are in a positional relationship where they face each other. A ring member 270 or the like can be interposed between the first annular groove 234a of the male screw body 230 and the second annular groove 255 of the cap body 250. By interposing this ring member 270, the first annular groove 234a of the male screw body 230 and the second annular groove 255 of the cap body 250 are connected so as to be able to rotate relative to each other.

[0066] As the ring member 270, a retaining ring such as an E-ring can be used. For example, as shown in Figure 16, the E-ring has locking projections 271 that protrude radially inward at three locations on its inner circumference: the center and both ends. The tips 271a of the projections on the inner circumference of these three locking projections 271 form an inner diameter approximately the same as the first annular groove 234a formed at the tip of the male screw body 230. The outer circumference 273 of the E-ring forms an outer diameter approximately the same as the second annular groove 255 formed in the cap body 250.

[0067] Thus, the configuration of the first annular groove 234a, the second annular groove 255, and the ring member 270 makes it possible to rotate the cap body 250 at the tip of the male threaded body 230 while preventing the cap body 250 from falling off the male threaded body 230.

[0068] Furthermore, when the clamped object P is clamped by the projection 151a and pressure receiving portion 160 of the cap body 250 (pressing portion 150), even if the male screw body 230 is rotated, slippage occurs between the first annular groove 234a of the male screw body 230 and the tip 271a of the protrusion of the ring member 270, and between the second annular groove 255 of the cap body 250 and the outer circumference 273 of the ring member 270, preventing the cap body 250 and the male screw body 230 from rotating together. Therefore, even when the male screw body 230 is rotated, it is possible to prevent damage to the clamped object P by the projection 151a of the cap body 250, as well as wear and breakage of the projection 151a.

[0069] In this embodiment, the configuration of a ring member 270, a first annular groove 234a, and a second annular groove 255 was described to prevent the cap body 250 from falling off the male threaded body 230, but these configurations are not necessarily required. If the inner circumferential surface 253 and / or inner bottom surface 258 of the cap body 250 can slide against the tip portion 234 of the male threaded body 230, it is possible to prevent the cap body 250 and the male threaded body 230 from rotating together. This makes it possible to prevent damage to the clamped object P by the projection 151a of the cap body 250, as well as wear and breakage of the projection 151a, even when the male threaded body 230 is rotated. [Third Embodiment] Figure 17 is a side view of the clamping device 300. Figure 18 is a front cross-sectional view of the main body 320. Figure 19 is a front view of the movable pressure receiving body 360.

[0070] A clamping device 300, which is a third embodiment of the present invention, will now be described. The difference from the first embodiment is that the pressure receiving portion 160 is a movable pressure receiving body 360, and the movable pressure receiving body 360 is configured to slide and tilt on the second support portion 327 of the main body 320. In the third embodiment, components similar to those in the first embodiment are denoted by the same reference numerals as in the first embodiment, and detailed descriptions are omitted.

[0071] As shown in Figures 17 and 18, the second support portion 327 has a substantially hemispherical first recessed seating surface 328 formed on its tip side, which opens toward the first support portion 122 and supports the movable pressure receiving body 360 in a sliding and tiltable manner.

[0072] As shown in Figure 19, the movable pressure receiving body 360 is composed of a substantially hemispherical first spherical portion 362 and a cylindrical flange portion 363 connected to the larger diameter side of the first spherical portion 362. The flange portion 363 has a pressure receiving surface 161 on one end face, similar to the first embodiment, with a projection 161a formed thereon. The flange portion 363 is formed to protrude radially outward from the outer diameter end of the first spherical portion 362. Here, the maximum outer diameter (OD1) of the flange portion 363 is set to be larger than the maximum outer diameter (OD2) of the first spherical portion 362. As a result, the flange portion 363 functions as a limiting portion 365, which will be described later. <Explanation of the restriction section> The limiting section 365 limits the inclination angle of the movable pressure receiving body 360 at the second support section 327 of the main body 300 to a predetermined range. Figure 20(A) shows the state in which the object to be clamped P is clamped by the pressing section 150 and the movable pressure receiving body 360. Figure 20(B) shows the state in which the movable pressure receiving body 360 is tilted due to the horizontal displacement of the object to be clamped P.

[0073] When the clamped body P is displaced horizontally, a horizontal force is applied from the clamped body P to the movable pressure receiving body 360, and the first spherical portion 362 of the movable pressure receiving body 360 tilts while sliding on the first concave seating surface 328. At this time, the lower outer edge (restricting portion 365) of the flange portion 363 on the side of the direction of displacement comes into contact with the second support portion 327. Specifically, the lower outer edge of the flange portion 363 comes into contact with the vicinity of the circumferential outer side of the open end 328a of the second support portion 327. This contact restricts the tilt angle of the movable pressure receiving body 360 at the second support portion 327 to a predetermined range.

[0074] In this case, the upper (+Z) clamping force from the movable pressure receiving body 360 on the upper end outer edge of the flange portion 363 on the side in which the clamped body P is displaced decreases. On the other hand, the upper (+Z) clamping force from the movable pressure receiving body 360 on the upper end outer edge of the flange portion 363 on the side opposite to the direction in which the clamped body P is displaced increases. In other words, even if the clamped body P is displaced horizontally, it becomes more difficult for the clamped body P to come off the clamping device 300.

[0075] Furthermore, as shown in Figure 19, the height (H1) from the bottom surface of the movable pressure receiving body 360 to the lower end of the flange portion 363 corresponding to the limiting portion 365 is set higher than the depth (D1) from the bottom surface of the first recessed seating surface 328 to the opening end 328a, as shown in Figure 18. In other words, the limiting portion 365 is located outward from the opening end 328a.

[0076] Note that the limiting portion 365 of the movable pressure receiving body 360 is not an essential component. For example, the movable pressure receiving body 360 may have a pressure receiving surface 161 with a projection 161a formed on the end face of the large-diameter side of the first spherical portion 362, without using the flange portion 363. In this case, if the pressure receiving surface 161 is located inward from the open end 328a of the first concave seating surface 328, the pressure receiving surface 161 will not be able to grip the object to be clamped P. Therefore, it is necessary for the pressure receiving surface 161 to be located outward from the open end 328a of the first concave seating surface 280.

[0077] In this embodiment, the limiting portion 365 has been described in the case where it is provided on the lower outer edge of the flange portion 363 of the movable pressure receiving body 360. However, the limiting portion 365 is not limited to the lower outer edge of the flange portion 360. For example, the limiting portion 365 may be provided on the outer circumferential surface of the flange portion 360 at the upper end or center in the Z-axis direction and in contact with the second support portion 327. Also, the shape of the flange 363 does not have to be cylindrical; for example, it may be rectangular. Furthermore, the shape of the limiting portion 365 is not limited to the flange shape. For example, multiple protruding shapes may be used as the limiting portion 365. [Modified version of the third embodiment] Figure 21 shows a modified example of the third embodiment. A modified example of the third embodiment of the present invention will now be described. The difference from the third embodiment is that a mechanism is provided to prevent the movable pressure receiving body 660 from falling from the main body 620. In this modified example, components similar to those in the third embodiment are denoted by the same reference numerals as in the third embodiment, and detailed descriptions are omitted.

[0078] As shown in Figure 21, the second support portion 627 has a substantially hemispherical first recessed seating surface 680 formed at its tip end, which opens toward the first support portion 122 and supports the movable pressure receiving body 660 in a sliding and tiltable manner. A first through hole 670 is provided in the center of this first recessed seating surface 680, which penetrates the second support portion 627 in the Z-axis direction. A female threaded portion 670a is formed in this first insertion hole 670. This female threaded portion 670a is screwed into the threaded portion 692b of the fixing member 690 shown in Figure 23.

[0079] As shown in Figure 22(B), the movable pressure-receiving body 660 is composed of a substantially hemispherical first spherical portion 662 and a cylindrical flange portion 360 connected to the larger diameter side of the first spherical portion 662. As shown in Figure 22(C), the outer circumferential surface 662a of the movable pressure-receiving body 660 is formed with the same curvature as the first concave seating surface 680 of the second support portion 627. The movable pressure-receiving body 660 has an inner circumferential surface 662b formed by a substantially hemispherical second concave seating surface 667 in the center of the pressure-receiving surface 161 and a second through hole 668 that is inserted from the bottom of the second concave seating surface 667, expanding in diameter outward in the Z-axis direction (minus Z-axis direction). The second concave seating surface 667 is formed with the same curvature as the second spherical portion 691c of the fixed member 690 shown in Figure 23.

[0080] The diameter of the second insertion hole 668 is small (r1) on the bottom side of the second recessed seating surface 667, and large (r2) on the outer surface side of the movable pressure receiving body 660.

[0081] As shown in Figure 23, the fixing member 690 consists of a head portion 691 and a shaft portion 692. The head portion 691 has a second spherical portion 691c formed in a substantially hemispherical shape on the seating surface from the shaft portion 692.

[0082] The outer diameter of the head 691 is set to be larger than the diameter (r1) of the hole on the bottom side of the second recessed seating surface 667 of the movable pressure receiving body 660. Therefore, the movable pressure receiving body 660 will not fall out from the head 691 side of the fixed member 690.

[0083] The shaft portion 692 is composed of a cylindrical insertion portion 692a and a male threaded portion 692b. The shaft diameter (r3) of the insertion portion 692a is set to be smaller than the small diameter (r1) of the second insertion hole 668 of the movable pressure receiving body 660. The male threaded portion 692b is screwed into the female threaded portion 670a in the first insertion hole 690 of the second support portion 627.

[0084] As shown in Figure 24, the movable pressure receiving body 660 is fixed in a state where it can slide and tilt on the first recessed seating surface 680 by screwing the threaded portion 692b of the fixing member 690 into the female threaded portion 670a of the first insertion hole 670. As described above, the second insertion hole 668 of the movable pressure receiving body 660 shown in Figure 22 expands in diameter from the bottom of the second recessed seating surface 667 outward in the Z-axis direction (-Z side). Therefore, tilting of the movable pressure receiving body 660 with respect to the Z-axis direction is permitted until the insertion portion 692a of the fixing member 690 contacts the inner circumferential surface of the second insertion hole 668 or until the tilt is restricted by the aforementioned limiting portion 365.

[0085] In the embodiments described above, the male screw body 130 (230), the first female screw portion 123, and the second female screw portion 141 are illustrated in the case where the pair of the first helical groove 133a and the first female screw helical ridge 123a and the pair of the second helical groove 133b and the second female screw helical ridge 141a are in a reverse thread relationship (right-hand thread and left-hand thread) (same lead angle but opposite lead direction), but the present invention is not limited thereto. For example, as shown in Figure 25, it is also possible to use the first helical groove 133a and the first female screw helical ridge 123a and the second helical groove 133b and the second female screw helical ridge 141a, which have the same lead direction (L1, L2) but different lead angles. In this case, by superimposing a helical groove with a different lead angle on the first helical groove 133a, the first helical groove 133a with a lead of L1 (lead angle α1) and the second helical groove 133b with a lead of L2 (lead angle α2) are formed with the thread direction aligned. In this case, the first thread G1 of the first helical groove 133a and the second thread G2 of the second helical groove 133b are not shared but remain separate.

[0086] In the embodiments described above, examples were given in which the pressing portion 150 (250) and the pressure receiving portion 160 (360) are located on the J-axis, which is the center of the male screw body 130 (230). However, the present invention is not limited thereto. For example, as shown in Figure 26, the pressure receiving portion 760 may be provided on the base 121 side (-X direction) of the J-axis.

[0087] In the above embodiments, an example was given in which a main body 120 is formed on a single base 121, comprising a first support portion 122 that supports the pressing portion 150 and a second support portion 127 on which a pressure receiving portion 160 is provided. However, the present invention is not limited to this.

[0088] For example, the clamping device may be constructed using multiple bases. As shown in Figure 27, the main body 820 consists of a first support portion 822 that supports the pressing portion, each formed in a roughly U shape, a second support portion 827 on which a pressure receiving portion 160 is provided, and a first base portion 821a and a second base portion 821b. The U-shaped ends of the first support portion 822 are connected to the upper side (+Z axis) of the first base portion 821a and the second base portion 821b, respectively, and the U-shaped ends of the second support portion 827 are connected to the lower side (-Z side) of the first base portion 821a and the second base portion 821b, respectively. In this way, the main body 820 may be constructed using multiple bases.

[0089] In the embodiments described above, an example was given in which a set of pressing parts 150 and pressure receiving parts 160 are used. However, the present invention is not limited to this, and multiple sets of pressing parts 150 and pressure receiving parts 160 can also be used. As shown in Figure 28, the main body 920 is composed of a first support part 922 that supports multiple pressing parts, each formed in a substantially T shape, a second support part 927 on which multiple pressure receiving parts 160 are provided, and a base part 121. One T-shaped end of the first support part 922 is connected to the upper side (+Z axis) of the base part 121, and one T-shaped end of the second support part 927 is connected to the lower side (-Z side) of the base part 121. Thus, the main body 920 may be provided with multiple sets of pressing parts 150 and pressure receiving parts 160. Alternatively, the first support portion 922 may be configured with a pressing portion 150 and a pressure-receiving portion 160 so that the pressing portion 150 and the pressure-receiving portion 160 face each other, and the second support portion 927 may also be configured with a pressing portion 150 and a pressure-receiving portion 160.

[0090] Furthermore, when multiple sets of pressing parts 150 and pressure receiving parts 160 are provided, each set may grip the object P in a different direction. For example, as shown in Figure 29, the first support part 1022a and the second support part 1027a grip in the Z-axis direction, and the first support part 1022b and the second support part 1027b grip in the Y-axis direction. In this example, the second support part 1027a has a configuration common to the second base part 1021b in relation to the first support part 1022a. Thus, a configuration that combines the functions of both a support part and a base part is also acceptable.

[0091] The components of the first to third embodiments described above can be combined with each other as long as they do not contradict each other. Furthermore, the clamped body P is not limited in terms of material such as steel, shape of member, or application such as temporary structures. As for materials, it can be applied to concrete, metal, synthetic resin, wood, glass, rubber, paper, etc. As for the shape of the member, it can be applied to similar items such as plates, columns, and blocks, or to different types of members. In terms of applications, it can be applied to all kinds of articles, including general use, furniture, civil engineering and / or building materials, and various types of machinery. [Explanation of Symbols]

[0092] 300, 620, 700, 800, 900, 1000... Clamping device, 30... Relative rotation suppression control structure, 40... Housing side displacement part, 45... Insertion side displacement part, 120, 320, 820, 920, 1020... Main body, 121... Base part, 122, 822, 922, 1022a, 1022b... First support part, 122a... Through hole, 123... First female thread part, 123... First female thread spiral, 125... Annular recess, 125a... Inner circumferential surface, 125b... Housing side engagement part, 127, 32 7, 627, 827, 927, 1027a, 1027b...Second support part, 130, 230...Male thread body, 131...Head, 132...Shaft part, 133...Male thread part, 133a...First helical groove, 133b...Second helical groove, 134, 234...Tip part, 140...Female thread body, 141...Second female thread part, 141a...Second female thread part, 141b...Annular projection, 142a...Outer surface, 142b...Insertion side engagement part, 143...Cylindrical part, 143a...Through hole, 150...Pressing part , 151... Pressing surface, 151a... Projection, 160, 760... Pressure receiving part, 161... Pressure receiving surface, 161a... Projection, 234a... First annular groove, 250... Cap body, 253... Inner circumferential surface, 255... Second annular groove, 258... Inner bottom surface, 270... Ring member, 271... Locking projection, 271a... Tip of projection, 273... Outer circumference, 328... First concave seating surface, 328a... Open end, 360, 660... Movable pressure receiving body, 362, 662... First spherical part, 363... • Flange section, 365...restriction section, 662a...outer circumference, 662b...inner circumference, 667...second concave seating surface, 668...second insertion hole, 670...first insertion hole, 670a...female thread section, 680...first concave seating surface, 690...fixing member, 691...head, 691a...end face, 691b...wrench hole, 691c...second spherical section, 692...shaft section, 692a...insertion section, 692b...threaded section, 821a, 1021a...first base section, 821b, 1021a...second base section

Claims

1. A clamping device for clamping an object to be clamped, positioned between a pressing part and a pressure receiving part, A main body having a first support part and a second support part facing each other, A male screw body having a male thread portion formed by overlapping a first helical groove set at an appropriate lead angle and / or lead direction, and a second helical groove set at a different lead angle and / or lead direction from the first helical groove, within the same region on the outer circumferential surface of the shaft portion. The male threaded body comprises a female threaded body that can be screwed into the male threaded body, The first support portion has a first female thread portion that can be screwed into either the first or second helical groove of the male thread body. The second support portion has a pressure receiving portion that receives the pressure from the pressing portion via the clamped body, The female threaded body has a second female threaded portion that can be screwed into the first helical groove or the other of the second helical groove of the male threaded body. A clamping device characterized in that the first female thread portion and the second female thread portion are screwed into the male thread portion of the male thread body, respectively.

2. The female threaded body has an annular projection, The first support portion has an annular recess on one end side of the first female screw portion, The clamping device according to claim 1, characterized in that the first female thread portion and the second female thread portion are screwed into the male thread portion of the male thread body and are joined together, and the annular projection portion is configured to be accommodated in the annular recess.

3. The annular projection has a convex insertion-side engaging portion on its outer circumferential surface, The annular recess has a convex receiving-side engaging portion on its inner circumferential surface, The clamping device according to claim 2, characterized in that, when the annular projection is housed in the annular recess, the insertion-side engaging portion and the housing-side engaging portion have at least one displacement portion, and the insertion-side engaging portion and the housing-side engaging portion interfere with each other at the displacement portion, causing elastic deformation and / or plastic deformation.

4. The clamping device according to claim 3, characterized in that the receiving-side engaging portion extends linearly with a component parallel to the receiving direction, and the insertion-side engaging portion extends linearly with a component perpendicular to the receiving direction, and / or the receiving-side engaging portion extends linearly with a component perpendicular to the receiving direction, and the insertion-side engaging portion extends linearly with a component parallel to the receiving direction.

5. The pressing portion is a cap body, The clamping device according to any one of claims 1 to 4, characterized in that the cap body is rotatable relative to the tip of the male screw body.

6. The second support portion has a first concave seating surface that opens toward the first support portion and has an inner surface that is substantially hemispherical in shape. The pressure-receiving portion is composed of a pressure-receiving surface provided on one end face and a first spherical portion corresponding to the first recessed seating surface provided on the other end face. The clamping device according to claim 1, characterized in that the first spherical portion is slidably and inclinedly arranged on the first recessed seating surface, and the pressure-receiving surface is located outward from the opening end of the first recessed seating surface.

7. The pressure-receiving portion has a limiting portion extending radially outward between the pressure-receiving surface and the first recessed seating surface. The clamping device according to claim 6, characterized in that the restricting portion abuts against the vicinity of the opening end of the first concave seating surface, thereby restricting the sliding and inclination of the first spherical portion to a predetermined range.

8. The first recessed seating surface has a first insertion hole in its center, The pressure-receiving portion has a second concave seating surface on its inner surface which is substantially hemispherical, and a second through hole is provided in the center of the second concave seating surface. The clamping device according to claim 6 or claim 7, characterized in that it has a fixing member comprising a head having a second spherical portion corresponding to the second concave seating surface and a shaft portion inserted into the first through hole.

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