Bolt for clamp device, clamp device, and nut member

Abstract

 The present invention provides a bolt for a clamp device with which safety and reliability can be maintained without reducing the pull-out strength of a nut member. A bolt (20) for a clamp device is used in a clamp device (1) for securing a pipe member (2), said bolt being run between a body member (3) as a first member and a lid member (4) as a second member, and having a nut member (30) tightened thereon. A stopper (25) is provided between a shaft part (24) and a male screw part (23), the stopper (25) being formed so as to be larger than the outer diameter of the male screw part (23). The stopper (25) is configured to stop movement of the shaft part (24) in the tightening direction when the nut member (30) is threaded onto the male screw part (23) and moved in the tightening direction.

Description

Clamping device bolt, clamping device and nut member

[0001] The present invention relates to a bolt for a clamping device, a clamping device, and a nut member that grip and fix tubular or rod-shaped target members such as pipe members that constitute temporary structures such as temporary scaffolding and shoring.

[0002] Conventionally, there have been clamping devices configured to grip a target object such as a pipe by opening and closing two members, a main body member and a cover member, via a pivotal part journaled between them. In such a clamping device, the technology described in Patent Document 1 is configured such that a bolt is connected to the main body member, and the main body member and the cover member grip and fix the target object by tightening a nut on the bolt.

[0003] The clamping device described in Patent Document 1 uses a half-threaded bolt, and a crimped portion can be formed at the tip of the bolt to prevent the nut from coming off. The shank on the base end side of the bolt is thread-rolled from an arbitrary position, and the diameter between the thread ridge and the thread root (rolled material diameter) is the shank diameter.

[0004] Furthermore, the clamping device described in Patent Document 1 has the problem that when the nut is tightened onto the bolt, the tip of the bolt protrudes from the cover member, which compromises safety.

[0005] To solve this problem, the clamping devices described in Patent Documents 2 and 3 are configured in the opposite way to the clamping device described in Patent Document 1, by providing a nut member on the main body member and positioning the bolt on the cover member side so that the tip of the bolt does not protrude from the cover member.

[0006] JP 2006-177048 A Utility Model Registration No. 3185701 A JP 2010-138930 A

[0007] In the bolt used in the clamping device described in the aforementioned Patent Document 1, when the nut is tightly tightened toward its base end, the shank does not stop the movement of the nut in the tightening direction, and the nut rotates around the shank, cutting the threads. In this case, the diameter of the shank is equal to the height of the threads, resulting in a low-height thread. As a result, the nut's engagement with the threads becomes smaller, resulting in a weak pull-out strength and a reduced expected strength. Furthermore, using the nut for thread cutting in this way can result in partial damage to the nut, making normal tightening difficult.

[0008] Incidentally, the reason why half-threaded bolts are used for the bolts of the clamping device is that the lengths of the threaded portion and shank are preset to provide the desired attachment strength when the target member, such as a pipe, has a predetermined diameter. If a fully-threaded bolt were used in the clamping device, the target member could be clamped even if the diameter of the target member is smaller than the predetermined diameter, but when the target member is clamped by the clamping device, the contact area between the main member and the cover member and the target member becomes narrow, which can cause slippage, preventing the desired attachment strength from being obtained.

[0009] Furthermore, the clamping device described in Patent Document 2 mentioned above has the bolt positioned on the cover member side, and therefore the tip of the bolt cannot be crimped, which means that the bolt may fall off, resulting in a problem of low safety.

[0010] Furthermore, the clamping device described in Patent Document 3 is composed of two parts: a nut member and a member for fixing the nut member to the main body member, which results in problems such as a large number of assembly steps and low mass productivity.

[0011] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a bolt for a clamp device that can improve reliability and safety without reducing the pull-out strength of the nut member.

[0012] Another object of the present invention is to provide a clamping device and a nut member that are easy to assemble and improve safety by preventing the tip of the male threaded portion from protruding from the nut member.

[0013] In order to achieve this object, the invention described in claim 1 is a bolt for a clamping device used in a clamping device in which a first member and a second member are rotatably arranged via a pivot shaft, a rod-shaped or tubular target member is sandwiched between the first member and the second member, and a nut member is spanned between the first member and the second member to tighten the target member, the bolt having a pivot portion rotatably supported on the tip end side of the first member, a shank portion that is continuous with the pivot portion and has a circumferential surface on which a male thread portion is not formed, and a male thread portion that is continuous with the shank in the axial direction, and a stopper that is formed larger than the outer diameter of the male thread portion is provided between the shank and the male thread portion, and the stopper is configured to stop movement of the shank in the tightening direction when the nut member is threaded onto the male thread portion and moved in the tightening direction.

[0014] In addition to the configuration of claim 1, the invention described in claim 2 is characterized in that the stopper is formed integrally with the shaft portion.

[0015] Furthermore, in addition to the configuration of claim 1, the invention described in claim 3 is characterized in that the stopper is a washer provided between the shaft portion and the male thread portion.

[0016] Furthermore, the invention described in claim 4 is characterized in that, in addition to the configuration described in claim 1, the male threaded portion has a crimped portion formed at the tip, and the diameter of the crimped portion is larger than the outer diameter of the male threaded portion.

[0017] The invention described in claim 5 is a clamping device in which the clamping device bolt described in any one of claims 1 to 4 is placed between the first member and the second member to tighten the nut member, thereby fixing the target member, wherein the nut member has a nut head that is tightened by a tool and a tubular portion extending from the nut head, a through hole that passes through the nut head and the tubular portion, and a female thread portion that screws into the male thread portion is formed inside the through hole on the tubular portion side.

[0018] Furthermore, the invention described in claim 6 is characterized in that, in addition to the configuration described in claim 5, the nut member has the female thread portion formed on the tip end side inside the through hole in the tightening direction, and an expanded portion formed continuous with the female thread portion on the rear end side inside the through hole, and the length of the expanded portion is longer than the length of the female thread portion.

[0019] Furthermore, the invention described in claim 7 is characterized in that, in addition to the configuration described in claim 5, the male thread portion has a crimped portion formed at the tip, and the diameter of the crimped portion is formed smaller than the diameter of the expansion portion of the nut member.

[0020] Furthermore, the invention described in claim 8 is characterized in that, in addition to the configuration described in claim 5, the outer peripheral surface of the tip end side of the cylindrical portion of the nut member is formed in a tapered shape.

[0021] Furthermore, the invention described in claim 9 is characterized in that, in addition to the configuration described in claim 5, the nut member has a guide portion formed on the nut head that is tightened by the tool, which serves as a guide when the tool is engaged.

[0022] The invention described in claim 10 is a nut member characterized by being used in any one of claims 5 to 9.

[0023] According to the invention described in claim 1, a stopper formed larger than the outer diameter of the male threaded portion is provided between the shank and the male threaded portion, and this stopper is configured to stop movement of the shank in the tightening direction when the nut member is threaded onto the male threaded portion and moved in the tightening direction, thereby making it possible to improve reliability and safety without reducing the pull-out strength of the nut member.

[0024] According to the second aspect of the present invention, the stopper is formed integrally with the shaft portion, and therefore, when manufactured using a dedicated machine, manufacturing becomes extremely easy.

[0025] According to the third aspect of the invention, the stopper is a washer provided between the shaft portion and the male threaded portion, so that the stopper can be easily attached at a desired position.

[0026] Furthermore, according to the invention described in claim 4, the male threaded portion has a crimped portion formed at the tip, and the diameter of this crimped portion is formed larger than the outer diameter of the male threaded portion, thereby preventing the nut member from coming loose and further improving safety.

[0027] Furthermore, according to the invention described in claim 5, the nut member has a nut head that is tightened with a tool and a tubular portion that extends from the nut head, and a through hole that passes through the nut head and the tubular portion, and a female threaded portion that screws into the male threaded portion is formed inside the through hole on the tubular portion side, so that the tip of the male threaded portion does not protrude from the nut member, improving safety and enabling easy assembly.

[0028] In addition, according to the fifth aspect of the present invention, the tip of the nut member extends in the axial direction of the male thread portion, so that the exposed portion of the axial length of the male thread portion when the nut member is tightened is shorter. When the target workpiece is gripped and fixed, the exposed portion of the axial length of the male thread portion to which the tightening force of the nut member is applied is shorter, so the axial rigidity of the male thread portion is increased and deformation of the male thread portion is reduced. This allows the desired torque to be obtained with a correspondingly smaller number of rotations.

[0029] Furthermore, according to the invention described in claim 6, the nut member has a female thread portion formed on the tip end side inside the through hole in the tightening direction, and an expanded portion formed continuous with the female thread portion on the rear end side inside the through hole, and the length of the expanded portion is formed longer than the length of the female thread portion, so that the tip end of the male thread portion will not protrude from the nut member reliably, further improving safety.

[0030] Furthermore, according to the invention described in claim 7, a crimped portion is formed at the tip of the male threaded portion, and the diameter of this crimped portion is smaller than the diameter of the expansion portion of the nut member. Therefore, a crimped portion can be formed at the tip of the male threaded portion, and this crimped portion is engaged with the female threaded portion to prevent the nut member from coming loose, thereby further improving safety.

[0031] Furthermore, according to the invention described in claim 8, the outer peripheral surface of the nut member on the tip side of the tubular portion is formed in a tapered shape, so that the tip side of the tubular portion does not come into contact with the target member, and the difference in cross-sectional performance between the female thread portion and the expansion portion is reduced, making it possible to reduce stress concentration on the cross section of the expansion portion.

[0032] Furthermore, according to the invention described in claim 9, the nut member has a guide portion formed on the nut head, which is tightened by a tool, that serves as a guide when the tool is engaged. This makes it possible to easily engage the tool with the nut member, thereby improving the work efficiency for tightening the nut member.

[0033] Furthermore, according to the invention described in claim 10, since the nut member is characterized by being used in any one of claims 5 to 9, the tip of the male threaded portion does not protrude, improving safety and making assembly easier.

[0034] 18 is a front view showing a state in which a target member is clamped in a clamping device to which a first embodiment of the clamping device bolt according to the present invention is applied. FIG. 19 is a longitudinal sectional view showing the clamping device of FIG. 1. FIG. 20 is a perspective view showing the clamping device of FIG. 1. FIG. 21 is a perspective view showing the first embodiment of the clamping device bolt according to the present invention. FIG. 22 is a front view of FIG. 23. FIG. 24 is a perspective view showing a second embodiment of the clamping device bolt according to the present invention. FIG. 25 is a front view of FIG. 26. FIG. 27 is a perspective view showing a third embodiment of the clamping device bolt according to the present invention. FIG. 28 is a front view of FIG. 29. FIG. 29 is a perspective view showing an orthogonal clamp to which the clamping device bolt of the first embodiment is applied. FIG. 29 is a front view of a universal clamp to which the clamping device bolt of the first embodiment is applied. FIG. 29 is a partial sectional front view showing the wall connector of FIG. 12 attached to a wall. FIG. 29 is a front view showing a state in which a thick target member is clamped in one embodiment of the clamping device according to the present invention. FIG. 21 is a longitudinal sectional view of the clamping device of FIG. 14. FIG. 22 is a perspective view showing the clamping device of FIG. 14. FIG. 23 is a perspective view showing one embodiment of the nut member according to the present invention. FIG. 24 is a front view of the nut member of FIG. 27. FIG. 25 is a cross-sectional view taken along line A-A of FIG. 28. Fig. 21 is a front view showing a state in which a thin object workpiece is clamped in one embodiment of a clamping device according to the present invention. Fig. 22 is a longitudinal sectional view showing the clamping device of Fig. 20. Fig. 23 is a perspective view showing an orthogonal clamp to which one embodiment of a clamping device is applied. Fig. 24 is a front view showing a universal clamp to which one embodiment of a clamping device is applied. Fig. 25 is a perspective view showing a wall junction to which one embodiment of a clamping device is applied. Fig. 26 is a partial sectional front view showing the wall junction of Fig. 24 attached to a wall.

[0035] Hereinafter, various embodiments of the clamping device bolt and the clamping device of the present invention will be described.

[0036] (First embodiment of clamping device bolt) Fig. 1 is a front view showing a state in which a clamping device to which a first embodiment of a clamping device bolt according to the present invention is applied has clamped a target member. Fig. 2 is a vertical cross-sectional view showing the clamping device of Fig. 1. Fig. 3 is a perspective view showing the clamping device of Fig. 1. Fig. 4 is a perspective view showing a first embodiment of a clamping device bolt according to the present invention. Fig. 5 is a front view of Fig. 4.

[0037] As shown in FIGS. 1 to 3 , the clamping device 1 of this embodiment grips and secures a metal pipe member 2, such as a single-tube pipe, as a tubular target member. In this case, the target member may be a solid metal rod or the like. The clamping device 1 includes a main body member 3 as a first member and a cover member 4 as a second member, each of which is formed into a curved (or bent) shape so as to sandwich the pipe member 2. The clamping device 1 is used to secure a functional component 5 attached to the main body member 3 to the pipe member 2. The functional component 5 may be, for example, a hook for attaching a wire or a bracket for attaching components used in temporary scaffolding.

[0038] The main body member 3 and the cover member 4 are each formed into a predetermined shape by pressing a metal plate or by casting, and the base ends 3a and 4a are connected to each other so that they can rotate freely by a first pin member 6 which serves as a rotation axis.

[0039] The first pin member 6 is rotatably inserted through a through hole 7 formed in the main body member 3 and a through hole 8 (shown in Figure 2) formed in the cover member 4. The main body member 3 and the cover member 4 are configured to sandwich the pipe member 2 with their side wall portions 9 and 10 respectively in contact with the outer circumferential surface of the pipe member 2.

[0040] As shown in Figure 3, the tip end 3b of the main body member 3 is formed by a pair of side wall portions 9. A through hole 11 is formed in each of these tip end portions 3b at the same position, and a second pin member 12 is rotatably inserted into these through holes 11. This second pin member 12 is inserted into an insertion hole 21a of a rotating portion 21 on the base end side of a partially threaded bolt 20 of the fastening member 13 shown in Figure 4, and rotatably supports the partially threaded bolt 20.

[0041] As shown in Figure 3, a U-shaped notch 15 is formed in the tip 4b of the cover member 4. This notch 15 is closed on the side of the first pin member 6 and open on the side opposite the first pin member 6. The notch 15 has an opening width that allows the male threaded portion 23 of the partially threaded bolt 20 and the cylindrical portion 32 of the nut member 30 to be inserted therein, and extends a predetermined length in the longitudinal direction of the cover member 4. This predetermined length is longer than the outer diameter of the nut head 31 of the nut member 30. A flat abutment surface 16 is formed on the upper surface of the tip 4b of the cover member 4 where the notch 15 is formed, against which the bottom surface of the stepped portion 34 of the nut head 31 abuts.

[0042] The male thread portion 23 of the partially threaded bolt 20 extends above the abutment surface 16 at the tip 4b of the cover member 4, and is threadedly engaged with the nut member 14. The partially threaded bolt 20 is placed between the tip 3b of the main body member 3 and the tip 4b of the cover member 4, and the nut member 14 is tightened onto the male thread portion 23 to secure the pipe member 2.

[0043] Next, the structure and operation of the partially threaded bolt 20 will be described in detail.

[0044] Fig. 4 is a perspective view showing a first embodiment of the bolt for a clamping device according to the present invention, and Fig. 5 is a front view of Fig. 4. In Fig. 5, the nut member 30 is shown in vertical cross section.

[0045] In the following description, the rotating portion 21 side of the half-threaded bolt 20 shown in FIGS. 4 and 5 is referred to as the lower side (one side), and the crimped portion 22 side is referred to as the upper side (other side).

[0046] As shown in Figures 4 and 5, the partially threaded bolt 20 is integrally manufactured by rolling or cutting and includes the annular pivot portion 21 rotatably supported by the second pin member 12 on the tip end 3b of the main body member 3, a shank 24 formed continuous with the pivot portion 21 and having a peripheral surface without a male thread portion 23, and the male thread portion 23 extending axially from the shank 24. The partially threaded bolt 20 includes a crimped portion 22 formed on the tip end, the outer diameter D2 of which is larger than the outer diameter D1 of the threads of the male thread portion 23. Therefore, the crimped portion 22 is formed after the nut member 30 is threaded onto the male thread portion 23. The outer diameter D3 of the shank 24 is slightly larger than the outer diameter D1 of the threads of the male thread portion 23.

[0047] In the half-threaded bolt 20 of this embodiment, a stopper 25 is provided between the shank 24 and the male threaded portion 23, and the outer diameter D4 of this stopper 25 is formed to be larger than the outer diameter D1 of the threaded portion of the male threaded portion 23. This stopper 25 has the function of stopping movement of the nut member 30 in the tightening direction onto the shank 24 when the nut member 30 is threaded onto the male threaded portion 23 and moved in the tightening direction, i.e., the function of preventing the nut member 30 from biting into the shank 24.

[0048] The stopper 25 is formed concentrically with the male thread portion 23 and the shank 24, and is composed of a large-diameter portion 26 formed with a diameter larger than the outer diameter D1 of the thread portion of the male thread portion 23, a flat portion 27 formed on the upper surface of the large-diameter portion 26, and a tapered portion 28 below the large-diameter portion 26, the tapered portion 28 having approximately the same vertical width as the large-diameter portion 26. The tapered portion 28 is formed so that its diameter gradually decreases along the direction of the shank 24. The lower end of the tapered portion 28 is formed so as to be the same as the outer diameter D3 of the shank 24.

[0049] Next, the structure and operation of the nut member 30 will be described in detail.

[0050] 1 to 3, the nut member 30 is manufactured as a single unit in a substantially cylindrical shape by forging, casting, cutting, or sintering metal, and has the nut head 31 that is tightened or otherwise operated with a tool such as a torque wrench or electric wrench (not shown), and a cylindrical portion 32 that extends in the axial direction from the nut head 31. The nut member 30 is formed in a bilaterally symmetrical shape in the cross-sectional view shown in FIG.

[0051] The nut head 31 includes a hexagonal nut portion 33 formed in the shape of a hexagonal cylindrical tube, and a disk-shaped stepped portion 34 molded integrally with the hexagonal nut portion 33. The hexagonal nut portion 33 has a chamfered portion 33a at its upper corner that serves as a guide when engaging a tool such as a torque wrench or power wrench. The stepped portion 34 is flange-shaped and has a diameter larger than the width of the notch 15 at the tip 4b of the lid member 4. In other words, the stepped portion 34 has a diameter such that its bottom surface abuts against the abutment surface 16 at the tip 4b of the lid member 4.

[0052] A through hole 35 is formed in the nut head 31 and the tubular portion 32 in the axial direction, and a female threaded portion 36 is formed inside the through hole 35 on the tubular portion 32 side to be screwed onto the male threaded portion 23 of the half-threaded bolt 20.

[0053] 2, the nut member 30 has a female thread portion 36 formed on the lower side (one side) of the through-hole 35 on the cylindrical portion 32 side, which is the tip end side in the fastening direction, and an expanded portion 37 formed continuous with the female thread portion 36 on the upper side (the other side) of the through-hole 35 on the rear end side in the fastening direction. The axial length of this expanded portion 37 is formed to be approximately the same as the axial length of the female thread portion 36.

[0054] The diameter of the expansion portion 37 is larger than the outer diameter D2 of the crimped portion 22 of the partially threaded bolt 20. The outer diameter D2 of the crimped portion 22 of this partially threaded bolt 20 is larger than the height of the threads of the female thread portion 36, i.e., the inner diameter of the female thread portion 36. By setting the diameter of the expansion portion 37, the outer diameter D2 of the crimped portion 22, and the inner diameter of the female thread portion 36 in this manner, the crimped portion 22 is able to move axially within the expansion portion 37, and even if an attempt is made to remove the nut member 30 from the partially threaded bolt 20, the crimped portion 22 is locked at the upper end of the female thread portion 36, thereby preventing the nut member 30 from coming off.

[0055] Here, the crimped portion 22 of the half-threaded bolt 20 is machined by removing the second pin member 12 from the through hole 11 and removing the half-threaded bolt 20 from the main body member 3, and then screwing the male threaded portion 23 into the female threaded portion 36 so that the tip of the male threaded portion 23 protrudes from the nut head 31.

[0056] Next, the operation of the clamp device 1 of this embodiment and the operation and effects of the bolt for the clamp device will be described.

[0057] In order to grip and secure the pipe member 2 using the clamp device 1 configured as described above, first, as shown in Figures 1 to 3, the nut member 30 is rotated in a direction to loosen it relative to the male threaded portion 23 of the half-threaded bolt 20, for example, until it is loosened to three or four threads before the crimped portion 22 of the male threaded portion 23.In this state, the nut head 31 of the nut member 30 is separated from the abutment surface 16 of the cover member 4, and the nut head 31 of the nut member 30 does not come into contact with the tip portion 4b of the cover member 4, allowing the half-threaded bolt 20 to rotate around the second pin member 12.

[0058] Then, the half-threaded bolt 20 is rotated clockwise around the second pin member 12 as shown by the two-dot chain line in Figure 2 to remove it from the notch portion 15 of the cover member 4, and then the cover member 4 is rotated counterclockwise around the first pin member 6 to open the cover member 4 from the main body member 3.

[0059] With the cover member 4 in an open state, the pipe member 2 is disposed between the main body member 3 and the cover member 4. Next, the cover member 4 is rotated clockwise around the first pin member 6 to place it over the pipe member 2, and as shown in Figure 3, the half-threaded bolt 20 is rotated counterclockwise around the second pin member 12 to insert the shank 24 of the half-threaded bolt 20 and the cylindrical portion 32 of the nut member 30 into the U-shaped notch 15, and then the hexagonal nut portion 33 of the nut head 31 of the nut member 30 is rotated using a tool such as a torque wrench or an electric wrench.

[0060] 2, the stepped portion 34 of the nut member 30 is pressed against the abutment surface 16 of the tip end 4b of the cover member 4. Then, when the female threaded portion 36 can no longer be screwed onto the partially threaded bolt 20, i.e., when the nut member 30 can no longer be rotated by the tool, the clamping operation of the clamp device 1 onto the pipe member 2 is completed.

[0061] Here, the lengths of the male threaded portion 23 and the shank 24 of the partially threaded bolt 20 are preset relative to the diameter of the pipe member 2 to be clamped. However, if the partially threaded bolt 20 in this embodiment does not have a stopper 25 and the length of the male threaded portion 23 is short relative to the length of the shank 24, when the nut member 30 is tightly tightened toward the base end of the male threaded portion 23, the movement of the nut member 30 in the tightening direction toward the shank 24 cannot be stopped, and the nut member 30 rotates to carve a thread into the shank 24. This results in an incomplete thread, with only the root of the thread formed, on the shank 24. As a result, the engagement allowance of the nut member 30 is reduced, significantly reducing the expected strength of the nut member 30 and potentially causing the nut member 30 to break.

[0062] For this reason, in this embodiment, a stopper 25 formed larger than the outer diameter D1 of the threads of the male thread portion 23 is provided between the male thread portion 23 and the shank 24 of the partially threaded bolt 20, so that when the nut member 30 is threaded onto the male thread portion 23 and moved in the tightening direction, the stopper 25 stops the movement of the nut member 30 in the tightening direction onto the shank 24. This prevents the formation of an incomplete thread in which only the roots of the thread are formed on the shank 24, making it possible to improve reliability and safety without reducing the pull-out strength of the nut member 30.

[0063] Furthermore, according to this embodiment, the stopper 25 is formed integrally with the shaft portion 24, and therefore, when manufactured using a dedicated machine, manufacturing becomes extremely easy.

[0064] Furthermore, according to this embodiment, the male thread portion 23 has a crimped portion 22 formed at its tip, and the outer diameter D2 of this crimped portion 22 is larger than the outer diameter D1 of the thread portion of the male thread portion 23, thereby preventing the nut member 30 from coming loose and further improving safety.

[0065] (Second embodiment of bolt for clamp device) Fig. 6 is a perspective view showing a second embodiment of the bolt for clamp device according to the present invention. Fig. 7 is a front view of Fig. 6. In this embodiment, the same reference numerals are used to denote the same or corresponding parts as those in the first embodiment of the bolt for clamp device. The same applies to the other embodiments.

[0066] 6 and 7, in the clamping device bolt of this embodiment, a stopper 25a is provided between the male thread portion 23 and the shank 24a of the half-threaded bolt 20A. This stopper 25a is formed to have the same diameter as the outer diameter D3 of the shank 24a, and the outer diameter D3 of the shank 24a is formed to be larger than the outer diameter D1 of the threaded portion of the male thread portion 23 over the entire axial direction.

[0067] Therefore, according to the clamping device bolt of this embodiment, stopper 25a is formed on the upper end of shank 24a, and the outer diameter D3 of shank 24a is formed to be larger than the outer diameter D1 of the threads of male thread 23, so that when nut member 30 is threaded onto male thread 23 and moved in the tightening direction, it has the function of stopping movement of shank 24 in the tightening direction, i.e., the function of preventing biting of nut member 30. This prevents the formation of an incomplete thread in which only the roots of the thread are formed on shank 24, making it possible to improve reliability and safety without reducing the pull-out strength of nut member 30.

[0068] (Third embodiment of bolt for clamp device) Fig. 8 is a perspective view showing a third embodiment of the bolt for clamp device according to the present invention. Fig. 9 is a front view of Fig. 8 .

[0069] 8 and 9 , in the clamping device bolt of this embodiment, a flat washer 29 is provided between the male threaded portion 23 and the shank 24 of the partially threaded bolt 20B as a stopper. The flat washer 29 has an annular shape and a larger diameter than the outer diameter D1 of the threaded portion of the male threaded portion 23. Specifically, the outer diameter D5 of the flat washer 29 is larger than the outer diameter D1 of the threaded portion of the male threaded portion 23. Furthermore, the insertion hole 29a of the flat washer 29 has a larger diameter than the diameter of the material from which the partially threaded bolt 20B is formed before the male threaded portion 23 is formed. After the flat washer 29 is inserted into the material, the male threaded portion 23 is formed by rolling. This makes the diameter of the insertion hole 29a smaller than the outer diameter D1 of the threaded portion of the male threaded portion 23, preventing the flat washer 29 from slipping out of the male threaded portion 23.

[0070] Therefore, in the flat washer 29 serving as a stopper in this embodiment, the outer diameter D5 of the flat washer 29 is formed to be larger than the outer diameter D1 of the threaded portion of the male threaded portion 23, so that when the nut member 30 is threaded onto the male threaded portion 23 and moved in the tightening direction, it has the function of stopping movement of the shank 24 in the tightening direction, i.e., the function of preventing the nut member 30 from biting in. This prevents the formation of an incomplete thread in which only the roots of the thread are formed on the shank 24, and makes it possible to maintain safety and reliability without reducing the pull-out strength of the nut member 30.

[0071] In this embodiment, the flat washer 29 used as the stopper is formed in a circular ring shape, but this is not limited to this, and it may be, for example, semicircular or polygonal with a circular insertion hole.

[0072] (Application Examples of the First Embodiment of the Clamping Apparatus Bolt) Next, application examples of the first embodiment of the clamping apparatus bolt according to the present invention will be described.

[0073] The clamping device 1 according to the above embodiment can be applied to the configurations shown in Figures 10 to 13. In each application example shown in Figures 10 to 13, the same parts as those in the first embodiment shown in Figures 1 to 5 are designated by the same reference numerals, and duplicated explanations will be omitted.

[0074] Fig. 10 is a perspective view showing an orthogonal clamp to which the clamping device bolt of the first embodiment is applied. Fig. 11 is a front view showing a universal clamp to which the clamping device bolt of the first embodiment is applied. Fig. 12 is a perspective view showing a wall connector to which the clamping device bolt of the first embodiment is applied. Fig. 13 is a partial cross-sectional front view showing the wall connector of Fig. 12 attached to a wall.

[0075] The orthogonal clamp 40 shown in Figure 10 is configured using two of the clamping devices 1 shown in Figures 1 to 3. The orthogonal clamp 40 shown in Figure 10 is configured by arranging two clamping devices 1 so that the axes of the pipe members 2 are perpendicular to each other, and joining the main members 3 together by overlapping them. The main members 3 can be joined together by, for example, rivets (not shown).

[0076] 11 is configured by connecting the main body members 3 of two clamping devices 1 with a connecting member 51. The connecting member 51 connects the main body members 3 to each other so that they can rotate freely. Therefore, the angle formed between the pipe member 2 gripped and fixed by one clamping device 1 and the pipe member 2 gripped and fixed by the other clamping device 1 can be any angle.

[0077] 12 and 13 is for fixing a pipe member 2 to a wall 70 of a building. This wall member 60 includes a support member 63 having a male thread member 62 that is threaded into an anchor 61 embedded in the wall 70 of the building, a slide member 64 that is movably fitted to the support member 63, and a clamp device 1 that is welded, bolted, or riveted to the tip of the slide member 64.

[0078] In this way, the orthogonal clamp 40, the flexible clamp 50, and the wall connector 60 constructed using the clamping device 1 according to this embodiment are configured so that when the nut member 30 is threaded onto the male threaded portion 23 and moved in the tightening direction, the stopper 25 stops the movement of the nut member 30 in the tightening direction onto the shaft portion 24. This prevents the formation of an incomplete thread on the shaft portion 24, where only the valley portion of the thread is formed, and the pull-out strength of the nut member 30 is not reduced.

[0079] [Other Embodiments of the Invention] While various embodiments of the present invention have been described, these embodiments are presented by way of example only and are not intended to limit the scope of the invention. These embodiments may be embodied in various other forms, and various omissions, substitutions, modifications, and combinations may be made without departing from the spirit of the invention. These embodiments and their modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as set forth in the claims.

[0080] For example, in each of the above embodiments, examples have been described in which the present invention is applied to the assembly of temporary structures such as temporary scaffolding and shoring, but the present invention is not limited to these and can also be applied to the assembly of other structures.

[0081] In the first embodiment, the stopper 25 has the large diameter portion 26 formed with a diameter larger than the outer diameter D1 of the threaded portion of the male threaded portion 23, and in the second embodiment, the stopper 25a is the upper end of the shank 24a formed with a diameter larger than the outer diameter D1 of the threaded portion of the male threaded portion 23, and in the third embodiment, an example is described in which a flat washer 29 is provided as a stopper, but the present invention is not limited to these. A stopper such as a protrusion may be provided between the male threaded portion 23 and the shank 24, and this stopper may stop movement of the nut member 30 in the tightening direction onto the shank 24. This stopper such as a protrusion may be detachably provided between the male threaded portion 23 and the shank 24.

[0082] Furthermore, in the application example of the clamp device bolt, an example in which the clamp device bolt of the first embodiment is applied has been described, but this is not limited to this, and the clamp device bolt of the second embodiment or the third embodiment may also be applied.

[0083] (One embodiment of a clamping device) A clamping device including another nut member corresponding to the nut member in each of the embodiments of the bolt for a clamping device described above will be described in the following embodiment.

[0084] Fig. 14 is a front view showing a state in which a thick object member is clamped in one embodiment of a clamping device according to the present invention, Fig. 15 is a longitudinal sectional view showing the clamping device of Fig. 14, and Fig. 16 is a perspective view showing the clamping device of Fig. 14.

[0085] As shown in FIGS. 14 to 16 , the clamping device 100 of this embodiment grips and secures a metal pipe member 102, such as a single-tube pipe, as a tubular target member. In this case, the target member may be a solid metal rod or the like. The clamping device 100 includes a main body member 103 as a first member and a cover member 104 as a second member, each of which is formed into a curved (or bent) shape so as to sandwich the pipe member 102. The clamping device 100 is used to secure a functional component 105 attached to the main body member 103 to the pipe member 102. The functional component 105 may be, for example, a hook for attaching a wire or a bracket for attaching components used in temporary scaffolding.

[0086] The main body member 103 and the cover member 104 are each formed into a predetermined shape by pressing a metal plate, and the base ends 103a and 104a are connected to each other so that they can rotate freely by a first pin member 106 that serves as a rotation axis.

[0087] The first pin member 106 is rotatably inserted through a through hole 107 formed in the main body member 103 and a through hole 108 (shown in Fig. 15) formed in the cover member 104. The main body member 103 and the cover member 104 are configured to sandwich the pipe member 102 with their side wall portions 109 and 110 respectively in contact with the outer circumferential surface of the pipe member 102.

[0088] As shown in Figure 16, the tip portion 103b of the main body member 103 is formed by a pair of side wall portions 109. A through hole 111 is formed in each of these tip portions 103b at the same position, and a second pin member 112 is rotatably inserted into these through holes 111. This second pin member 112 rotatably supports the base end of an externally threaded portion 114 of a fastening member 113. As shown in Figure 15, the externally threaded portion 114 of the fastening member 113 has a crimped portion 114a formed at its tip portion, and is formed with a larger diameter than the shank 114b of the externally threaded portion 114.

[0089] As shown in Figure 16, a U-shaped notch 115 is formed in the tip 104b of the lid member 104. This notch 115 is closed on the side of the first pin member 106 and open on the side opposite the first pin member 106, and extends a predetermined length in the longitudinal direction of the lid member 104 with an opening width that allows the shank 114b of the male threaded portion 114 and a cylindrical portion 122 of a nut member 120 (described later) to be inserted therein. This predetermined length is longer than the outer diameter of a nut head 121 of the nut member 120 (described later). A flat abutment surface 116 for abutting against the nut head 121 of the nut member 120 is formed in the portion of the tip 104b of the lid member 104 where the notch 115 is formed, on the side of the crimped portion 114a of the tip of the male threaded portion 114.

[0090] The fastening member 113 has a nut member 120 in addition to the male thread portion 114 , and this nut member 120 is configured to be engageable with and detachable from the tip portion 104 b of the lid member 104 , and is screwed onto the male thread portion 114 .

[0091] Next, the structure and operation of the nut member 120 will be described in detail.

[0092] Fig. 17 is a perspective view showing one embodiment of a nut member according to the present invention, Fig. 18 is a front view showing the nut member of Fig. 17, and Fig. 19 is a cross-sectional view taken along line AA of Fig. 18.

[0093] 17 to 19, the nut head 121 side will be referred to as the upper side (other side) and the tubular portion 122 side will be referred to as the lower side (one side). In other words, the tubular portion 122 side, which is the leading end side in the fastening direction of the nut member 120, will be referred to as the lower side (one side), and the nut head 121 side, which is the rear end side in the fastening direction, will be referred to as the upper side (other side).

[0094] 17 to 19, the nut member 120 is manufactured as a single unit into a substantially cylindrical shape by forging, casting, cutting, or sintering metal, and has the nut head 121 that is tightened by a tool such as a torque wrench or an electric wrench (not shown), and a tubular portion 122 that extends in the axial direction from the nut head 121. The nut member 120 is formed in a bilaterally symmetrical shape in the cross-sectional view shown in FIG.

[0095] The nut head 121 includes a hexagonal nut portion 123 formed in the shape of a hexagonal cylindrical tube and a disk-shaped stepped portion 124 molded integrally with the hexagonal nut portion 123. The hexagonal nut portion 123 has a chamfered portion 123a at the upper corner that serves as a guide when engaging a tool such as a torque wrench or power wrench. The stepped portion 124 is flange-shaped and has a diameter larger than the width of the notch 115 in the tip end 104b of the lid member 104. In other words, the stepped portion 124 has a diameter such that its bottom surface abuts against the abutment surface 116 of the tip end 104b of the lid member 104.

[0096] A through hole 125 is formed in the nut head 121 and the cylindrical portion 122, penetrating in the axial direction, and a female threaded portion 126 is formed inside the through hole 125 on the cylindrical portion 122 side to be threaded onto the shaft portion 114b of the male threaded portion 114. The nut member 120 has a tapered surface 122a whose lower outer peripheral surface is tapered and corresponds to the female threaded portion 126 inside the through hole 125 of the cylindrical portion 122.

[0097] As shown in Figure 19, the nut member 120 has a female thread portion 126 formed on the lower side (one side) of the through-hole 125 on the cylindrical portion 122 side, which is the tip end side in the tightening direction, and an expanded portion 127 formed continuous with the female thread portion 126 on the upper side (the other side) of the through-hole 125 on the rear end side in the tightening direction. The cylindrical portion 122 is formed to be longer in the axial direction than the female thread portion 126. Therefore, the female thread portion 126 can be positioned axially below the cylindrical portion 122, which allows the axial length of the male thread portion 114 to be shortened. This increases the axial rigidity of the male thread portion 114 at a predetermined torque, allowing the nut member 120 to be tightened with a smaller number of rotations.

[0098] The diameter of the expansion portion 127 is larger than the diameter of the crimped portion 114a of the male thread portion 114. The diameter of the crimped portion 114a of the male thread portion 114 is larger than the height of the threads of the female thread portion 126, i.e., the inner diameter of the female thread portion 126. By setting the diameter of the expansion portion 127, the diameter of the crimped portion 114a, and the inner diameter of the female thread portion 126 in this manner, the crimped portion 114a is able to move axially within the expansion portion 127, and even if an attempt is made to remove the nut member 120 from the male thread portion 114, the crimped portion 114a is engaged with the upper end of the female thread portion 126, thereby preventing the nut member 120 from coming off.

[0099] Here, the crimped portion 114a of the male threaded portion 114 is machined by removing the second pin member 112 from the through hole 111 and removing the male threaded portion 114 from the main body member 103, and then screwing the male threaded portion 114 into the female threaded portion 126 so that the tip of the male threaded portion 114 protrudes from the nut head 121.

[0100] Next, the operation and effects of the clamping device 100 of this embodiment will be described.

[0101] In order to grip and fix the pipe member 102 using the clamping device 100 configured as described above, first, as shown in Figures 14 to 16, the nut member 120 is rotated in a direction to loosen it relative to the male threaded portion 114, for example, until it is loosened to three or four threads in front of the crimped portion 114a of the male threaded portion 114.In this state, the nut head 121 of the nut member 120 is separated from the abutment surface 116 of the cover member 104, and the nut head 121 of the nut member 120 does not come into contact with the tip portion 104b of the cover member 104, allowing the male threaded portion 114 to rotate relative to the second pin member 112.

[0102] Then, the male screw portion 114 is rotated clockwise around the second pin member 112 as shown by the dotted line in Figure 15 to remove it from the notch portion 115 of the cover member 104, and then the cover member 104 is rotated counterclockwise around the first pin member 106 to open the cover member 104.

[0103] With the lid member 104 in an open state, the pipe member 102 is disposed between the main body member 103 and the lid member 104. Next, the lid member 104 is rotated clockwise around the first pin member 106 to place it over the pipe member 102, and as shown in Figure 16, the male threaded portion 114 is rotated counterclockwise around the second pin member 112 to insert the shaft portion 114b of the male threaded portion 114 and the cylindrical portion 122 of the nut member 120 into the U-shaped notch 115, and the hexagonal nut portion 123 of the nut head 121 of the nut member 120 is rotated using a tool such as a torque wrench or an electric wrench.

[0104] 15, the stepped portion 124 of the nut member 120 is pressed against the abutment surface 116 of the tip end 104b of the cover member 104. Then, when the female threaded portion 126 can no longer be screwed into the male threaded portion 114, that is, when the nut member 120 can no longer be rotated by the tool, the clamping operation of the clamp device 100 onto the pipe member 102 is completed.

[0105] In this embodiment, as shown in Figure 15, the nut member 120 has a nut head 121 that is tightened by the tool and a tubular portion 122 that extends from the nut head 121, and a female threaded portion 126 that screws into the male threaded portion 114 is formed inside a through hole 125 on the tubular portion 122 side, so that the distance L1 from the tip of the female threaded portion 126 of the nut member 120 to the center of the second pin member 112, which is the fixed position of the male threaded portion 114, is significantly shortened.

[0106] Incidentally, when the distance between the female thread portion 126 of the nut member 120 and the center of the second pin member 112, which is the fixed position of the male thread portion 114, is shortened, the rigidity of the male thread portion 114 increases, so the elongation of the male thread portion 114 when the nut member 120 is tightened is reduced, and a predetermined tightening torque can be obtained with fewer rotations of the nut member 120 compared to the prior art documents. The axial rigidity of the male thread portion 114 = its Young's modulus x cross-sectional area / length of the male thread portion 114.

[0107] Therefore, in this embodiment, a female threaded portion 126 that screws into the male threaded portion 114 is formed inside the through hole 125 on the tubular portion 122 side, so that the tip of the male threaded portion 114 does not protrude from the nut member 120, improving safety and making assembly easier.

[0108] That is, according to this embodiment, because the tip of the nut member 120 extends in the axial direction of the male thread portion 114, the exposed portion of the axial length of the male thread portion 114 is shorter when the nut member 120 is tightened. Furthermore, when the pipe member 102 is gripped and fixed, the exposed portion of the axial length of the male thread portion 114 to which the tightening force of the nut member 120 is applied is shorter, so the axial rigidity of the male thread portion 114 is increased and deformation of the male thread portion 114 is reduced. As a result, a predetermined torque can be obtained with a correspondingly smaller number of rotations.

[0109] Furthermore, according to this embodiment, when the nut member 120 is tightened against the pipe member 102, the nut member 120 has a tubular portion 122 extending from the nut head 121. Normally, the lower end of the tubular portion 122 comes into contact with the pipe member 102, preventing the pipe member 102 from being tightened any further. However, in this embodiment, the outer peripheral surface of the lower side of the tubular portion 122 of the nut member 120 is formed into a tapered surface 122a, so that the lower side of the tubular portion 122 does not come into contact with the pipe member 102. This also reduces the difference in cross-sectional performance between the female threaded portion 126 and the expansion portion 127, i.e., the difference in thickness between the female threaded portion 126 and the expansion portion 127, thereby making it possible to reduce stress concentration on the cross section of the expansion portion 127.

[0110] According to this embodiment, the nut member 120 has the female thread portion 126 formed inside the through hole 125 toward the tip end in the tightening direction, and the expanded portion 127 formed contiguous with the female thread portion 126 toward the rear end inside the through hole 125, and the length of the expanded portion 127 is longer than the length of the female thread portion 126, so that the tip of the male thread portion 114 is reliably prevented from protruding from the nut member 120, further improving safety. This is because the tip of the male thread portion 114 will not protrude from the nut member 120 even if the diameters of the pipe members 102, 102A are different.

[0111] Furthermore, according to this embodiment, the male thread portion 114 has a crimped portion 114a formed at its tip, and the diameter of this crimped portion 114a is smaller than the diameter of the expansion portion 127 of the nut member 120. Therefore, the crimped portion 114a can be formed at the tip of the male thread portion 114, and this crimped portion 114a is engaged with the female thread portion 126 to prevent the nut member 120 from coming loose, thereby further improving safety.

[0112] Furthermore, according to this embodiment, the nut member 120 has a chamfered portion 123a formed on the nut head 121, which is tightened by a tool, that serves as a guide when the tool is engaged, so that the tool can be easily engaged with the nut member 120, thereby improving the work efficiency for tightening the nut member 120.

[0113] Furthermore, according to this embodiment, the nut member 120 is formed in a bilaterally symmetrical shape in the front view shown in FIG. 5, which makes it easy to process and allows it to be manufactured at low cost.

[0114] (Modification of Pipe Member) Figure 20 is a front view showing a state in which a thin target member is clamped in one embodiment of a clamping device according to the present invention. Figure 21 is a longitudinal cross-sectional view showing the clamping device of Figure 20. Figures 20 and 21 show a clamping device 100 that grips and fixes a pipe member 102A that has a smaller diameter than the pipe member 102 shown in Figures 14 and 15. Figures 20 and 21 also show a state in which the rotation of the nut member 120 has been completed. Note that the clamping device 100 and nut member 120 shown in Figures 20 and 21 are the same as those shown in Figures 14 to 19, and are clamping a small-diameter pipe member 102A.

[0115] In this embodiment, when a small diameter pipe member 102A is clamped, a female threaded portion 126 that screws into the male threaded portion 114 is formed inside the through hole 125 on the tubular portion 122 side, so the distance L2 from the tip of the female threaded portion 126 of the nut member 120 to the center of the second pin member 112, which is the fixed position of the male threaded portion 114, becomes even shorter than that of the pipe member 102.

[0116] In this embodiment, similarly to the pipe member 102, by tightening the female threaded portion 126 of the nut member 120 onto the male threaded portion 114, the stepped portion 124 of the nut member 120 is pressed against the abutment surface 116 of the tip end 104b of the cover member 104, and the pipe member 102A is clamped until the female threaded portion 126 cannot be rotated relative to the male threaded portion 114, thereby enabling even a small-diameter pipe member 102A to be firmly gripped and fixed by the main body member 103 and the cover member 104. As a result, in this embodiment, a small-diameter pipe member can be gripped and fixed until the tip end of the female threaded portion 126 of the nut member 120 in the tightening direction reaches the base end of the shank 114b of the male threaded portion 114, or until the tip end 104b of the cover member 104 comes into contact with the tip end 103b of the main body member 103. Then, the large diameter pipe member can be gripped and fixed in the direction in which the female thread portion 126 of the nut member 120 is loosened until about three threads remain on the female thread portion 126.

[0117] Therefore, in this embodiment, it is possible to grasp and fix pipe members having a diameter smaller than the small-diameter pipe member 102A shown in Figures 20 and 21, as well as pipe members having a diameter larger than the pipe member 102 shown in Figures 14 and 15, thereby greatly improving the versatility of the clamp device 100.

[0118] (Application Examples of an Embodiment of the Clamping Device) Next, application examples of an embodiment of the clamping device according to the present invention will be described.

[0119] The clamping device 100 according to the above embodiment can be applied to the configurations shown in Figures 22 to 25. In each application example shown in Figures 22 to 25, the same parts as those in the embodiment shown in Figures 14 to 21 are designated by the same reference numerals, and duplicated explanations will be omitted.

[0120] Fig. 22 is a perspective view showing an orthogonal clamp to which the clamping device of one embodiment is applied. Fig. 23 is a front view showing a universal clamp to which the clamping device of one embodiment is applied. Fig. 24 is a perspective view showing a wall connector to which the clamping device of one embodiment is applied. Fig. 25 is a partial cross-sectional front view showing the wall connector of Fig. 24 attached to a wall.

[0121] An orthogonal clamp 130 shown in Fig. 22 and a universal clamp 140 shown in Fig. 23 are each constructed using two of the clamping devices 100 shown in Figs. 14 to 21. The orthogonal clamp 130 shown in Fig. 22 is constructed by arranging two clamping devices 100 so that the axes of the pipe members 102 are perpendicular to each other, and joining the main body members 103 together by overlapping them. The main body members 103 can be joined together by, for example, rivets (not shown).

[0122] 23 is configured by connecting the main body members 103 of two clamping devices 100 with a connecting member 141. The connecting member 141 connects the main body members 103 to each other so that they can rotate freely. Therefore, the angle formed between the pipe member 102 gripped and fixed by one clamping device 100 and the pipe member 102 gripped and fixed by the other clamping device 100 can be any angle.

[0123] 24 and 25 is used to secure a pipe member 102 to a wall 160 of a building. This wall member 150 includes a support member 153 having a male threaded portion 152 that is threadedly engaged with an anchor 151 embedded in the wall 160 of the building, a slide member 154 that is movably fitted to the support member 153, and a clamp device 100 that is welded, bolted, or riveted to the tip of the slide member 154.

[0124] In this way, the orthogonal clamp 130, flexible clamp 140, and wall connector 150 constructed using the clamp device 100 of this embodiment are able to prevent the nut member 120 from coming loose compared to conventional clamp devices, and also firmly tighten the pipe member 102 to securely grip and fix the pipe member 102.

[0125] [Other Embodiments of the Invention] While various embodiments of the present invention have been described, these embodiments are presented by way of example only and are not intended to limit the scope of the invention. These embodiments may be embodied in various other forms, and various omissions, substitutions, modifications, and combinations may be made without departing from the spirit of the invention. These embodiments and their modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as set forth in the claims.

[0126] For example, in the above embodiment, an example in which the nut member 120 is incorporated into the clamp device 100 is described, but this is not limited to this, and the present invention can also be applied to other devices, etc., as long as the male thread portion 114 is formed short and the nut member 120 is firmly fixed.

[0127] Furthermore, in the above embodiment, examples have been described in which the present invention is applied to the assembly of temporary structures such as temporary scaffolding and shoring, but the present invention is not limited to these and can also be applied to the assembly of other structures.

[0128] DESCRIPTION OF SYMBOLS 1 Clamping device 2 Pipe member (target member) 3 Main body member (first member) 3a Base end portion 3b Tip portion 4 Cover member (second member) 4a Base end portion 4b Tip 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 15 Notch portion 16 Contact surface 20 Partially threaded bolt 20A Partially threaded bolt 20B Partially threaded bolt 21 Rotating portion 21a Insertion hole 22 Crimped portion 23 Male thread portion 24 Shaft portion 24a Shaft portion 25 Stopper 25a Stopper 26 Large diameter portion 27 Flat portion 28 Tapered portion 29 Flat washer (stopper) 30 Nut member 31 Nut head 32 Cylindrical portion 33 Hexagonal nut portion 33a Chamfered portion 34 Step portion 35 Through hole 36 Female thread portion 37 Expansion portion 40 Orthogonal clamp 50 Universal clamp 51 Connecting member 60 Wall connector 61 Anchor 62 Male thread member 63 Support member 64 Slide member 70 Wall of building 100 Clamping device 102 Pipe member (target member) 103 Main body member (first member) 103a Base end portion 103b Tip portion 104 Cover member (second member) 104a Base end portion 104b Tip portion 105 Functional part 106 First pin member (rotating shaft) 107 Through hole 108 Through hole 109 Side wall portion 110 Side wall portion 111 Through hole 112 Second pin member 113 Fastening member 114 Male thread portion 114a Crimped portion 114b Shaft portion 115 Notch portion 116 Abutment surface 120 Nut member 121 Nut head portion 122 Cylindrical portion 122a Tapered surface 123 Hexagonal nut portion 123a Chamfered portion 124 Stepped portion 125 Through hole 126 Female thread portion 127 Expansion portion 130 Orthogonal clamp 140 Universal clamp 141 Connecting member 150 Wall connector 151 Anchor 152 Male thread portion 153 Support member 154 Slide member 160 Wall of building D1 Outer diameter of thread portion of male thread portion D2 Outer diameter of crimped portion D3 Outer diameter of shaft portion D4 Outer diameter of stopper D5 Flat washer outer diameter

Claims

1. A bolt for a clamping device used in a clamping device in which a first member and a second member are rotatably provided via a rotation axis, a rod-shaped or tubular target member is sandwiched between the first member and the second member, and the target member is fixed by bridging a nut member between the first member and the second member and tightening it. The bolt for a clamping device has: a rotating portion rotatably supported on the tip end side of the first member; a shaft portion continuous with the rotating portion and having a circumferential surface without a male screw portion; and a male screw portion continuously provided in the axial direction of the shaft portion. A stopper formed larger than the outer diameter of the male screw portion is provided between the shaft portion and the male screw portion, and the stopper is configured to stop the movement of the shaft portion in the tightening direction when the nut member is screwed onto the male screw portion and moved in the tightening direction.

2. The bolt for a clamping device according to claim 1, wherein the stopper is integrally formed with the shaft portion.

3. The bolt for a clamping device according to claim 1, wherein the stopper is a washer provided between the shaft portion and the male screw portion.

4. The bolt for a clamping device according to claim 1, wherein the male screw portion has a caulking portion formed at the tip end, and the diameter of the caulking portion is formed larger than the outer diameter of the male screw portion.

5. A clamping device in which the bolt for a clamping device according to any one of claims 1 to 4 is bridged between the first member and the second member and the nut member is tightened to fix the target 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 the nut head and the cylindrical portion is formed. A female screw portion screwed onto the male screw portion of the bolt for the clamping device is formed inside the through hole on the cylindrical portion side.

6. The clamping device according to claim 5, wherein 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.

7. The clamp device according to claim 5, wherein the male screw portion has a caulking portion formed at its tip end, and the diameter of the caulking portion is formed smaller than the diameter of the expanding portion of the nut member.

8. The clamp device according to claim 5, wherein the outer peripheral surface of the nut member on the tip end side of the cylindrical portion is formed in a tapered shape.

9. The clamp device according to claim 5, wherein a guide portion for guiding when the tool engages is formed on the nut head portion tightened by the tool on the nut member.

10. A nut member characterized by being used in any one of claims 5 to 9.

Images