Clamp device and nut member

Abstract

To provide a clamp device that improves safety and is easy to assemble by preventing a tip part of a male screw member from protruding from a nut member.SOLUTION: A clamp device 1 is configured to fix a pipe member 2 by rotating a body member 3, which is a first member, and a lid member 4, which is a second member, to clamp the pipe member 2, which is a target member, and tightening a fastening member 13 bridged between the body member 3 and the cover member 4. The fastening member 13 comprises a male screw member 14 that is rotatably supported on a tip part 3b side of the body member 3, and a nut member 20 that is detachably engaged with a tip part 4b side of the cover member 4 and is screwed onto the male screw member 14. The nut member 20 has a nut head part 21 and a cylindrical part 22. A through hole is formed through the nut head part 21 and the cylindrical part 22. A female screw part screwed onto the male screw member 14 is formed inside the through hole on the cylindrical part 22 side.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a clamp device for gripping and fixing a tubular target member such as a pipe member or a rod-shaped target member that constitutes a temporary structure such as a temporary scaffold or a shoring work, and a nut member used in this clamp device.

Background Art

[0002] Conventionally, some clamp devices are configured to open and close two members, a main body member and a lid member, via a rotating portion pivotally supported therebetween to grip a target member such as a pipe. In the technique described in Patent Document 1 among such clamp devices, a bolt is connected to the main body member, and by tightening a nut on the bolt, the main body member and the lid member are configured to be able to grip and fix the target member.

[0003] The clamp device described in Patent Document 1 has a problem that when the nut is tightened on the bolt, the tip of the bolt protrudes from the lid member, so the safety is impaired by the protruding tip.

[0004] In order to solve this problem, the clamp devices described in Patent Document 2 and Patent Document 3, contrary to the clamp device described in Patent Document 1, are configured such that a nut member is provided on the main body member, a bolt is arranged on the lid member side, and the tip of the bolt does not protrude from the lid member.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, in the clamping device described in Patent Document 2 mentioned above, since the bolt is arranged on the lid member side, the tip of the bolt cannot be caulked, so there is a possibility that the bolt may fall off, and there is a problem of low safety.

[0007] In addition, the clamping device described in Patent Document 3 is composed of two members, a nut member and a member for fixing this nut member to the main body member. Therefore, there are problems that the assembly man-hours are large and the mass productivity is low.

[0008] Therefore, an object of the present invention is to provide a clamping device and a nut member in which the tip of the male screw member does not protrude from the nut member, the safety is improved, and the assembly is easy.

Means for Solving the Problems

[0009] In order to achieve such a problem, the invention described in claim 1 is a clamping device for gripping and fixing a rod-shaped or tubular target member, having a first member and a second member for sandwiching the target member, the first member and the second member are rotatably provided via a rotation axis, the first member and the second member are rotated to sandwich the target member, and the target member is fixed by tightening a fastening member spanned between the first member and the second member. The fastening member includes a male screw member rotatably supported on the tip side of the first member, and a nut member that is detachable on the tip side of the second member and is screwed onto the male screw member. The nut member has a nut head tightened by a tool and a cylindrical portion extended from the nut head, and a through hole penetrating through these nut head and the cylindrical portion is formed. A female screw portion screwed onto the male screw member is formed inside the through hole on the cylindrical portion side.

[0010] Further, the invention according to claim 2, in addition to the configuration according to claim 1, is characterized in that in the nut member, the female screw portion is formed on the tip side inside the through hole with respect to the tightening direction, an extension portion is formed continuously with the female screw portion on the rear end side inside the through hole, and the length of the extension portion is formed longer than the length of the female screw portion.

[0011] Further, the invention according to claim 3, in addition to the configuration according to claim 2, is characterized in that in the male screw member, a caulking portion is formed at the tip, and the diameter of the caulking portion is formed smaller than the diameter of the extension portion of the nut member.

[0012] Further, the invention according to claim 4, in addition to the configuration according to claim 1, is characterized in that in the nut member, the outer peripheral surface on the tip side of the cylindrical portion is formed in a tapered shape.

[0013] Further, the invention according to claim 5, in addition to the configuration according to claim 1, is characterized in that in the nut member, a guide portion for guiding when the tool engages is formed on the nut head portion tightened by the tool.

[0014] Further, the invention according to claim 6 is a nut member characterized by being used in any one of claims 1 to 5.

Advantages of the Invention

[0015] According to the invention described in claim 1, the fastening member includes a male screw member rotatably supported on the tip side of the first member and a nut member detachably engaged with the tip side of the second member and screwed onto the male screw member. This nut member has a nut head portion tightened by a tool and a cylindrical portion extending from this nut head portion, and a through hole penetrating these nut head portion and cylindrical portion is formed, and a female screw portion screwed onto the male screw member is formed inside the through hole on the cylindrical portion side. Therefore, the tip portion of the male screw member does not protrude from the nut member, improving safety and enabling easy assembly.

[0016] In addition, according to the invention described in claim 1, since the tip of the nut member extends in the axial direction of the male screw member, the exposed portion in the axial length of the male screw member when the nut member is tightened becomes shorter. And when the target member is gripped and fixed, since the exposed portion in the axial length of the male screw member to which the tightening force of the nut member is applied becomes shorter, the axial rigidity of the male screw member increases and the deformation of the male screw member decreases. As a result, a predetermined torque can be obtained at a correspondingly smaller number of rotations.

[0017] Further, according to the invention described in claim 2, in the nut member, the female screw portion is formed on the tip side inside the through hole with respect to the tightening direction, and an expansion portion is formed continuously with the female screw portion on the rear end side inside this through hole, and since the length of the expansion portion is formed longer than the length of the female screw portion, it is ensured that the tip portion of the male screw member does not protrude from the nut member, and the safety can be further improved.

[0018] Further, according to the invention described in claim 3, since the caulking portion is formed at the tip of the male screw member and the diameter of this caulking portion is formed smaller than the diameter of the expansion portion of the nut member, a caulking portion can be formed at the tip of the male screw member, and this caulking portion is locked to the female screw portion to prevent the nut member from coming off in advance, and the safety can be further improved.

[0019] Further, according to the invention described in claim 4, since the outer peripheral surface on the tip side of the cylindrical portion of the nut member is formed in a tapered shape, the tip side of the cylindrical portion does not come into contact with the target member, and the difference in cross-sectional performance between the female screw portion and the expansion portion can be reduced, and stress concentration on the cross-section of the expansion portion can be alleviated.

[0020] Further, according to the invention described in claim 5, since a guide portion serving as a guide when engaging the tool is formed on the nut head that is tightened by the tool on the nut member, the tool can be easily engaged with the nut member, and the working efficiency for tightening the nut member can be improved.

[0021] Further, according to the invention described in claim 6, since it is a nut member characterized by being used in any one of claims 1 to 5, the tip of the male screw member does not protrude, improving safety and enabling easy assembly.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Modes for Carrying Out the Invention

[0023] Hereinafter, an embodiment of the clamp device and the nut member of the present invention will be described.

[0024] (An Embodiment of the Clamp Device) FIG. 1 is a front view showing a state in which a thick target member is sandwiched in an embodiment of a clamping device according to the present invention. FIG. 2 is a longitudinal sectional view showing the clamping device of FIG. 1. FIG. 3 is a perspective view showing the clamping device of FIG. 1.

[0025] As shown in FIGS. 1 to 3, the clamping device 1 of the present embodiment grips and fixes a metal pipe member 2 as a tubular target member such as a single pipe. In this case, the target member may be a solid metal bar or the like. The clamping device 1 includes a main body member 3 as a first member and a lid member 4 as a second member, each formed in a curved shape (or bent shape) so as to sandwich the pipe member 2. The clamping device 1 is used to fix a functional component 5 attached to the main body member 3 to the pipe member 2. Examples of the functional component 5 include a hook for attaching a wire and a bracket for attaching a component used in a temporary scaffold.

[0026] The main body member 3 and the lid member 4 are each formed into a predetermined shape by pressing a metal plate material, and their base ends 3a and 4a are rotatably connected to each other by a first pin member 6 as a rotation axis.

[0027] The first pin member 6 is rotatably inserted into a through hole 7 formed in the main body member 3 and a through hole 8 shown in FIG. 2 formed in the lid member 4. The main body member 3 and the lid member 4 are configured to sandwich the pipe member 2 with their side wall portions 9 and 10 in contact with the outer peripheral surface of the pipe member 2, respectively.

[0028] As shown in FIG. 3, the tip portion 3b of the main body member 3 is formed by a pair of side wall portions 9. Through holes 11 are formed at the same positions in these tip portions 3b, and a second pin member 12 is rotatably inserted into these through holes 11. The second pin member 12 rotatably supports the base end portion of the male screw member 14 of the fastening member 13. The male screw member 14 of the fastening member 13 is formed with a caulking portion 14a at the tip end as shown in FIG. 2, and is formed to have a larger diameter than the shaft portion 14b of the male screw member 14.

[0029] As shown in FIG. 3, a U-shaped notch 15 is formed at the tip 4b of the lid member 4. This notch 15 is formed at the tip 4b of the lid member 4 such that the side of the first pin member 6 is blocked and the side opposite to the first pin member 6 is open, and has an opening width into which the shaft portion 14b of the male screw member 14 and the cylindrical portion 22 of the nut member 20 described later can be inserted, and extends in the longitudinal direction of the lid member 4 with a predetermined length. This predetermined length means a length longer than the outer diameter of the nut head 21 of the nut member 20 described later. On the portion of the tip 4b of the lid member 4 where the notch 15 is formed, on the caulking portion 14a side of the tip of the male screw member 14, a flat contact surface 16 for the nut head 21 of the nut member 20 to contact is formed.

[0030] The fastening member 13 has, in addition to the male screw member 14, a nut member 20. This nut member 20 is configured to be detachable with respect to the tip 4b of the lid member 4 and is screwed onto the male screw member 14.

[0031] Next, the configuration and operation of the nut member 20 will be described in detail.

[0032] FIG. 4 is a perspective view showing an embodiment of the nut member according to the present invention. FIG. 5 is a front view showing the nut member of FIG. 4. FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5.

[0033] Hereinafter, in the nut member 20 shown in FIGS. 4 to 6, the nut head 21 side will be described as the upper side (the other side), and the cylindrical portion 22 side will be described as the lower side (one side). That is, the cylindrical portion 22 side, which is the tip side in the tightening direction of the nut member 20, is the lower side (one side), and the nut head 21 side, which is the rear end side in the tightening direction, is the upper side (the other side).

[0034] As shown in FIGS. 4 to 6, the nut member 20 is integrally manufactured in a substantially cylindrical shape by forging, casting, cutting, or sintered metal, and has the nut head 21 tightened by a tool such as a torque wrench or an electric wrench (not shown), and a cylindrical portion 22 extending axially from the nut head 21. The nut member 20 is formed in a bilaterally symmetric shape in the cross-sectional view shown in FIG. 5.

[0035] The nut head 21 includes a hexagonal nut portion 23 formed in a hexagonal square tube shape, and a disc-shaped stepped portion 24 integrally formed continuously with the hexagonal nut portion 23. The hexagonal nut portion 23 is formed with a chamfered portion 23a whose upper corner portion serves as a guide portion when engaging with a tool such as a torque wrench or an electric wrench. The stepped portion 24 is formed in a flange shape and has a diameter larger than the width of the notch 15 at the tip 4b of the lid member 4. That is, the stepped portion 24 is formed to have a diameter such that its bottom surface abuts against the contact surface 16 at the tip 4b of the lid member 4.

[0036] A through hole 25 penetrating axially is formed in the nut head 21 and the cylindrical portion 22, and an internal thread portion 26 screwed onto the shaft portion 14b of the male thread member 14 is formed inside the through hole 25 on the cylindrical portion 22 side. The nut member 20 has a tapered surface 22a whose lower outer peripheral surface corresponding to the internal thread portion 26 inside the through hole 25 of the cylindrical portion 22 is formed in a tapered shape.

[0037] As shown in FIG. 6, in the nut member 20, the internal thread portion 26 is formed in the lower side (one side) inside the through hole 25 on the cylindrical portion 22 side which is the tip side in the tightening direction, and an expansion portion 27 is formed continuously with the internal thread portion 26 in the upper side (the other side) inside the through hole 25 on the rear end side in the tightening direction. The cylindrical portion 22 is formed longer than the axial length of the internal thread portion 26. Therefore, since the internal thread portion 26 can be disposed on the lower side in the axial direction of the cylindrical portion 22, the axial length of the male thread member 14 can be shortened. As a result, the axial rigidity of the male thread member 14 at a predetermined torque is increased, and it can be tightened with a small number of rotations of the nut member 20.

[0038] Further, the diameter of the expansion portion 27 is formed larger than the diameter of the caulking portion 14a of the male screw member 14. The diameter of the caulking portion 14a of the male screw member 14 is formed larger than the height of the thread of the female screw portion 26, that is, the inner diameter of the female screw portion 26. By setting the diameter of the expansion portion 27, the diameter of the caulking portion 14a, and the inner diameter of the female screw portion 26 in this way, the caulking portion 14a can move axially within the expansion portion 27. Also, even if an attempt is made to separate the nut member 20 from the male screw member 14, the caulking portion 14a is locked at the upper end portion of the female screw portion 26, thereby obtaining an effect of preventing the nut member 20 from coming off.

[0039] Here, the caulking portion 14a of the male screw member 14 is processed in a state where the second pin member 12 is removed from the through hole 11 and the male screw member 14 is removed from the main body member 3, and the male screw member 14 is screwed into the female screw portion 26 so that the tip end portion of the male screw member 14 protrudes from the nut head portion 21.

[0040] Next, the operation and effects of the clamp device 1 of the present embodiment will be described.

[0041] In order to grip and fix the pipe member 2 by the clamp device 1 configured as described above, first, as shown in FIGS. 1 to 3, the nut member 20 is rotated in a loosening direction with respect to the male screw member 14. For example, it is loosened to a state where three to four threads in front of the caulking portion 14a of the male screw member 14 are loosened. In this state, the nut head portion 21 of the nut member 20 is separated from the contact surface 16 of the lid member 4, and the nut head portion 21 of the nut member 20 does not contact the tip end portion 4b of the lid member 4, and the male screw member 14 is rotatable with respect to the second pin member 12.

[0042] Then, after rotating the male screw member 14 counterclockwise about the second pin member 12 as shown by the two-dot chain line in FIG. 2 to separate it from the notch portion 15 of the lid member 4, the lid member 4 is rotated counterclockwise about the first pin member 6, so that the lid member 4 is in an open state.

[0043] With the lid member 4 open, the pipe member 2 is disposed between the main body member 3 and the lid member 4. Next, the lid member 4 is rotated clockwise about the first pin member 6 and overlapped so as to cover the pipe member 2. As shown in FIG. 3, the male screw member 14 is rotated counterclockwise about the second pin member 12, and the shaft portion 14b of the male screw member 14 and the cylindrical portion 22 of the nut member 20 are inserted into the U-shaped notch portion 15. The hexagonal nut portion 23 of the nut head portion 21 of the nut member 20 is rotated by a tool such as a torque wrench or an electric wrench.

[0044] Then, the female screw portion 26 of the nut member 20 gradually tightens against the male screw member 14, and the stepped portion 24 of the nut member 20 is pressed against the contact surface 16 of the tip portion 4b of the lid member 4 as shown by the solid line in FIG. 2. And the clamping operation of the pipe member 2 of the clamping device 1 ends in a state where the female screw portion 26 cannot be screwed into the male screw member 14, that is, a state where the rotation operation of the nut member 20 by the above tool becomes impossible.

[0045] Thus, in the present embodiment, as shown in FIG. 2, the nut member 20 has a nut head portion 21 tightened by the above tool and a cylindrical portion 22 extended from the nut head portion 21. Since the female screw portion 26 screwed into the male screw member 14 is formed inside the through hole 25 on the cylindrical portion 22 side, the distance L1 from the tip of the female screw portion 26 of the nut member 20 to the center of the second pin member 12 which is the fixed position of the male screw member 14 is significantly shortened.

[0046] Incidentally, when the distance between the female screw portion 26 of the nut member 20 and the center of the second pin member 12 which is the fixed position of the male screw member 14 becomes short, the rigidity of the male screw member 14 increases. Therefore, the elongation of the male screw member 14 when the nut member 20 is tightened becomes small, and a predetermined tightening torque can be obtained with a smaller number of rotations of the nut member 20 as compared with the prior art documents. And the axial rigidity of the male screw member 14 = its longitudinal elastic modulus × the cross-sectional area of the male screw member 14 / length.

[0047] Therefore, in the present embodiment, since the female screw portion 26 that is screwed into the male screw member 14 is formed inside the through hole 25 on the cylinder portion 22 side, the tip of the male screw member 14 does not protrude from the nut member 20, improving safety and enabling easy assembly.

[0048] That is, according to the present embodiment, since the tip of the nut member 20 extends in the axial direction of the male screw member 14, the exposed portion in the axial length of the male screw member 14 when the nut member 20 is tightened becomes shorter. And when the pipe member 2 is gripped and fixed, since the exposed portion in the axial length of the male screw member 14 to which the tightening force of the nut member 20 is applied becomes shorter, the axial rigidity of the male screw member 14 increases and the deformation of the male screw member 14 decreases. As a result, a predetermined torque can be obtained at a smaller number of rotations.

[0049] Furthermore, according to the present embodiment, since the nut member 20 has the cylinder portion 22 extended from the nut head 21 when the pipe member 2 is tightened, normally the lower end portion of the cylinder portion 22 contacts the pipe member 2 and the pipe member 2 cannot be tightened any further. However, in the present embodiment, since the outer peripheral surface on the lower side of the cylinder portion 22 is formed as the tapered surface 22a in the nut member 20, the lower side of the cylinder portion 22 does not contact the pipe member 2, and the difference in cross-sectional performance between the female screw portion 26 and the expansion portion 27, that is, the difference in the wall thickness between the female screw portion 26 and the expansion portion 27, can be reduced, and stress concentration on the cross-section of the expansion portion 27 can be alleviated.

[0050] According to the present embodiment, in the nut member 20, the female screw portion 26 is formed on the tip side inside the through hole 25 with respect to the tightening direction, the expansion portion 27 is formed continuously with the female screw portion 26 on the rear end side inside the through hole 25, and the length of the expansion portion 27 is formed longer than the length of the female screw portion 26. Therefore, it is ensured that the tip of the male screw member 14 does not protrude from the nut member 20, and safety can be further improved. This is the case even when the diameters of the pipe members 2 and 2A are different, and similarly, the tip of the male screw member 14 does not protrude from the nut member 20.

[0051] Further, according to the present embodiment, since the male screw member 14 has a caulking portion 14a formed at its tip end, and the diameter of this caulking portion 14a is formed smaller than the diameter of the expanding portion 27 of the nut member 20, the caulking portion 14a can be formed at the tip end of the male screw member 14. This caulking portion 14a is engaged with the female screw portion 26 to prevent the nut member 20 from coming off in advance, and the safety can be further improved.

[0052] And, according to the present embodiment, since the nut member 20 has a chamfered portion 23a formed on the nut head 21 that is tightened by a tool, which serves as a guide when the tool is engaged, the tool can be easily engaged with the nut member 20, and the working efficiency for tightening the nut member 20 can be increased.

[0053] Also, according to the present embodiment, since the nut member 20 is formed in a bilaterally symmetric shape in the cross-sectional view shown in FIG. 5, it is easy to process and can be manufactured at low cost.

[0054] (Modification of the pipe member) FIG. 7 is a front view showing a state in which a thin target member is sandwiched in an embodiment of the clamp device according to the present invention. FIG. 8 is a longitudinal sectional view showing the clamp device of FIG. 7. FIGS. 7 and 8 show a clamp device 1 that grips and fixes a pipe member 2A having a smaller diameter than the pipe member 2 shown in FIGS. 1 and 2. Also, FIGS. 7 and 8 show a state in which the rotation operation of the nut member 20 has been completed. The clamp device 1 and the nut member 20 shown in FIGS. 7 and 8 are the same as those shown in FIGS. 1 to 6 and are sandwiching the small-diameter pipe member 2A.

[0055] In the present embodiment, when the small-diameter pipe member 2A is sandwiched, since a female screw portion 26 that is screwed onto the male screw member 14 is formed inside the through-hole 25 on the cylinder portion 22 side, the distance L2 from the tip end of the female screw portion 26 of the nut member 20 to the center of the second pin member 12, which is the fixed position of the male screw member 14, becomes even shorter than that of the pipe member 2.

[0056] In this embodiment, by tightening the female thread portion 26 of the nut member 20 against the male thread member 14 in the same manner as the pipe member 2, the stepped portion 24 of the nut member 20 is pressed against the contact surface 16 of the tip portion 4b of the lid member 4, and the female thread portion 26 is rotated with respect to the male thread member 14 until the pipe member 2A cannot be rotated. By sandwiching the pipe member 2A, the small-diameter pipe member 2A can be firmly gripped and fixed by the main body member 3 and the lid member 4. Thus, in this embodiment, until the tip portion in the tightening direction of the female thread portion 26 of the nut member 20 reaches the base end portion of the shaft portion 14b of the male thread member 14, or until the tip portion 4b of the lid member 4 contacts the tip portion 3b of the main body member 3, the small-diameter pipe member can be gripped and fixed. Then, a large-diameter pipe member can be gripped and fixed in the loosening direction of the female thread portion 26 of the nut member 20 until about three threads of the female thread portion 26 remain.

[0057] Therefore, in this embodiment, since it is possible to grip and fix the pipe member from a pipe member smaller in diameter than the small-diameter pipe member 2A shown in FIGS. 7 and 8 to a pipe member larger in diameter than the pipe member 2 shown in FIGS. 1 and 2, the versatility of the clamp device 1 can be significantly improved.

[0058] (Application Example of an Embodiment of the Clamp Device) Next, each application example of an embodiment of the clamp device according to the present invention will be described.

[0059] The clamp device 1 according to the above embodiment can be applied to the configuration as shown in FIGS. 9 to 12. In each application example shown in FIGS. 9 to 12, the same parts as those in the embodiment shown in FIGS. 1 to 8 are denoted by the same reference numerals, and redundant descriptions are omitted.

[0060] FIG. 9 is a perspective view showing an orthogonal clamp to which the clamp device of an embodiment is applied. FIG. 10 is a front view showing a universal clamp to which the clamp device of an embodiment is applied. FIG. 11 is a perspective view showing a wall connection to which the clamp device of an embodiment is applied. FIG. 12 is a partial cross-sectional front view showing a state in which the wall connection of FIG. 11 is attached to a wall.

[0061] The orthogonal clamp 30 shown in Fig. 9 and the universal clamp 40 shown in Fig. 10 are each composed of two clamp devices 1 shown in Figs. 1 to 8. The orthogonal clamp 30 shown in Fig. 9 is formed by arranging two clamp devices 1 so that the axes of the pipe members 2 are orthogonal, and overlapping and joining the main body members 3 together. The joining of the main body members 3 can be performed, for example, by rivets (not shown).

[0062] The universal clamp 40 shown in Fig. 10 is configured by connecting the main body members 3 of each of the two clamp devices 1 with a connecting member 41. The connecting member 41 connects the main body members 3 so as to be rotatable. Therefore, the angle formed by the pipe member 2 held and fixed by one clamp device 1 and the pipe member 2 held and fixed by the other clamp device 1 can be set to an arbitrary angle.

[0063] The wall connector 50 shown in Figs. 11 and 12 is for fixing the pipe member 2 to the wall 60 of a building. This wall connector 50 includes a support member 53 having a male screw member 52 that is screwed into an anchor 51 embedded in the wall 60 of the building, a slide member 54 that is movably fitted to the support member 53, and a clamp device 1 or the like that is welded, bolted, or riveted to the tip of the slide member 54.

[0064] Thus, the orthogonal clamp 30, the universal clamp 40, and the wall connector 50 configured using the clamp device 1 according to this embodiment prevent the nut member 20 from coming off compared to conventional clamp devices, and firmly clamp the pipe member 2 to securely hold and fix the pipe member 2.

[0065] [Other Embodiments of the Invention] Although each embodiment of the present invention has been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

[0066] For example, in the above embodiment, an example in which the nut member 20 is incorporated into the clamping device 1 has been described. However, the present invention is not limited thereto, and if the male screw member 14 is formed short to firmly fix the nut member 20, it can also be applied to other devices and the like.

[0067] Furthermore, in the above embodiment, an example applied to the assembly of temporary structures such as temporary scaffolds and shoring work has been described. However, the present invention is not limited thereto, and it can also be applied to the assembly of other structures.

Explanation of Reference Numerals

[0068] 1 Clamping device 2 Pipe member (target member) 3 Body member (first member) 3a Base end portion 3b Tip end portion 4 Cover member (second member) 4a Base end portion 4b Tip end portion 5 Functional component 6 First pin member (rotating shaft) 7 Through hole 8 Through hole 9 Side wall portion 10 Side wall portion 11 Through hole 12 Second pin member 13 Fastening member 14 Male screw member 14a Caulking portion 14b Shaft portion 15 Notch 16 Contact surface 20 Nut member 21 Nut head 22 Cylindrical part 22a Tapered surface 23 Hexagonal nut part 23a Chamfered part 24 Step part 25 Through hole 26 Female thread part 27 Expansion part 30 Orthogonal clamp 40 Universal clamp 41 Connecting member 50 Wall connection 51 Anchor 52 Male thread member 53 Strut member 54 Slide member 60 Wall of building

Claims

1. A clamp device for gripping and fixing a rod-shaped or tubular target member, comprising a first member and a second member for sandwiching the target member, wherein the first member and the second member are rotatably provided via a rotation axis, and are configured to sandwich the target member by rotating the first member and the second member, and to fix the target member by tightening a fastening member spanned between the first member and the second member. The fastening member includes a male screw member rotatably supported on the tip end side of the first member, and a nut member that is detachable on the tip end side of the second member and is screwed onto the male screw member. The nut member has a nut head tightened by a tool and a cylindrical portion extending from the nut head, and a through hole penetrating through the nut head and the cylindrical portion is formed. A clamp device, characterized in that a female screw portion screwed onto the male screw member is formed inside the through hole on the cylindrical portion side.

2. The nut member is characterized in that the female screw portion is formed on the tip end side inside the through hole with respect to the tightening direction, an expansion portion is continuously formed on the rear end side inside the through hole in continuity with the female screw portion, and the length of the expansion portion is formed longer than the length of the female screw portion. The clamp device according to claim 1.

3. The male screw member is characterized in that a caulking portion is formed at the tip end, and the diameter of the caulking portion is formed smaller than the diameter of the expansion portion of the nut member. The clamp device according to claim 2.

4. The nut member is characterized in that the outer peripheral surface on the tip end side of the cylindrical portion is formed in a tapered shape. The clamp device according to claim 1.

5. The nut member is characterized in that a guide portion serving as a guide when the tool is engaged is formed on the nut head tightened by the tool. The clamp device according to claim 1.

6. A nut member, characterized in that it is used in any one of claims 1 to 5.

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