WO2024111191A1 - Clamp - Google Patents

Abstract

[Problem] To provide a clamp that makes it difficult for the shaft of a bolt to come off from a U-shaped notch and that can firmly fasten a member to be clamped. [Solution] A clamp comprises a main body member 23 (first clamping member) and a lid member 24 (second clamping member) that are rotatably connected to each other by a first pin member 26, and a bolt screw-in member 38 rotatably connected to the main body member by a second pin member 37, and also comprises a bolt 41 in which a shaft 42 is inserted into a U-shaped notch 51 at the end of the lid member, the shaft is screwed into the bolt screw-in member, and a head 43 is in contact with a portion of the lid member on the opposite side of the bolt screw-in member. By rotating the bolt at the head, a pipe member 22 (member to be clamped) is clamped by the main body member and the lid member, and the position where the second pin member is arranged with respect to the bolt axis A of the bolt is eccentric to the pipe member side. A gap S1 is created between the bolt screw-in member and the pipe member from the start to the end of the rotation operation of the bolt at the head.

Description

Clamp

The present invention relates to a clamp that clamps and secures pipe members that constitute temporary structures such as temporary scaffolding and shoring.

An example of a conventional clamp is described in Patent Document 1. The clamp disclosed in Patent Document 1 is a flexible clamp that connects a pipe member used in temporary scaffolding to another pipe member in a crossed state at any angle. This conventional clamp will be explained using Figure 14. The clamp 1 shown in Figure 14 has a pair of clamping parts 3, 4 that clamp a pipe member 2 as a clamped member. The clamping parts 3, 4 are connected to each other by a connecting member 5 so that they can rotate freely.

Each clamping portion 3, 4 has a first clamping member 7 and a second clamping member 8, one end of which is rotatably connected to each other by a first pin member 6. A bolt screwing member 10 is rotatably connected to the other end of the first clamping member 7 by a second pin member 9. The bolt screwing member 10 has a female threaded member 11. The shaft portion 12a of a bolt 12 is screwed into the female threaded member 11. The portion of the bolt screwing member 10 that faces the pipe member 2 is formed into a shape that follows the shape of the outer circumferential surface of the pipe member 2.

A U-shaped notch 13 is formed at the other end of the second clamping member 8. The U-shaped notch 13 is closed on the side of the first pin member 6 and is formed in a U-shape such that the side opposite the side of the first pin member 6 is open. The shaft 12a of the bolt 12 described above is inserted into this U-shaped notch 13.
The bolt 12 is screwed into the bolt screwing member 10 with its head 12 b abutting against a portion of the other end of the second clamping member 8 on the opposite side to the bolt screwing member 10 .
The second pin member 9 connecting the first clamping member 7 and the bolt screwing member 10 is positioned eccentrically toward the pipe member 2 with respect to the bolt axis of the bolt 12 whose shaft portion 12a is screwed into the bolt screwing member 10.

In a conventional clamp 1 configured in this manner, the pipe member 2 as the clamped member is clamped by the first clamping member 7, the second clamping member 8, and the bolt screw-in member 10 when the bolt 12 is rotated at the head 12b.

Japanese Utility Model Application Publication No. 59-17305

In the clamp 1 shown in Patent Document 1, when the bolt screwing member 10 comes into contact with the pipe member 2 while the head 12b is being rotated to screw the bolt 12 into the bolt screwing member 10, the position of the bolt 12 is determined relative to the second clamping member 8, and there is a risk that the screwing of the bolt 12 will end before the shaft 12a of the bolt 12 has reached the bottom of the U-shaped notch 13 (the end on the first pin member side). In such a case, since the shaft 12a of the bolt 12 is located closer to the opening side than the bottom of the U-shaped notch 13, it will be easier to come off the U-shaped notch 13 than if the shaft 12a was located at the bottom of the U-shaped notch 13.

In addition, if the bolt screwing member 10 comes into contact with the pipe member 2 while the bolt 12 is being tightened, the first clamping member 7 will be unable to rotate around the first pin member 6 or will be unable to rotate at all after this contact due to the friction between the bolt screwing member 10 and the pipe member 2. This makes it difficult to tighten the pipe member 2 with a large force between the first clamping member 7 and the second clamping member 8.

The object of the present invention is to provide a clamp that makes it difficult for the bolt shaft to come out of the U-shaped notch and can firmly clamp the clamped member.

In order to achieve this object, the clamp of the present invention comprises a first clamping member and a second clamping member, one end of which is rotatably connected to each other by a first pin member, a bolt screwing member rotatably connected to the other end of the first clamping member by a second pin member, and a U-shaped notch formed at the other end of the second clamping member, the side of which facing the first pin member is closed and the side opposite to the first pin member is open, into which a shaft portion is inserted, the shaft portion being screwed into the bolt screwing member, and a head portion being inserted into the U-shaped notch formed at the other end of the second clamping member. A clamp that includes a bolt that is in contact with a portion opposite to the bolt screw-in member, and a clamped member is clamped between the first clamping member and the second clamping member by rotating the bolt at the head, and the position at which the second pin member is positioned relative to the bolt axis of the bolt whose shaft is screwed into the bolt screw-in member is eccentric toward the clamped member, and a gap is generated between the bolt screw-in member and the clamped member from the start to the end of the rotation of the bolt at the head.

In the present invention, in the clamp, the end of the rotation operation of the bolt at the head may be when the rotation operation of the bolt at the head becomes impossible.

In the present invention, in the clamp, the rotation of the bolt at the head is performed by an electric tool, and the time when the rotation of the bolt at the head becomes impossible may be when the rotation by the electric tool reaches its limit.

The present invention may be such that, in the clamp, when the shaft of the bolt reaches the end of the U-shaped notch on the side of the first pin member, the rotation of the bolt at the head is completed.

In the present invention, in the clamp, the surface of the bolt screwing member that faces the clamped member may be inclined in a direction away from the clamped member as it extends from the second pin member side to the head side of the bolt.

In the present invention, in the clamp, the bolt screwing member may be directly provided with a female threaded hole into which the shaft of the bolt is screwed.

In the clamp of the present invention, the bolt screwing member may include a female threaded member having a female threaded hole into which the shaft portion of the bolt is screwed, and a rotating member to which the female threaded member is fixed and which is freely rotatable around the second pin member.

In the present invention, in the clamp, a gap may be formed between the other end of the first clamping member and the clamped member from the start to the end of the rotation operation of the bolt at the head.

In the present invention, the position at which the second pin member is disposed in the clamp may be a position away from the female threaded hole into which the bolt of the bolt-insertion member is screwed, toward the clamped member.

In the present invention, by inserting the bolt shaft into the U-shaped notch and screwing the bolt into the bolt screwing member, the bolt screwing member is pulled by the bolt, and a rotational moment is applied to the bolt screwing member around the second pin member. By applying the rotational moment to the bolt screwing member in this manner, the bolt screwing member rotates around the second pin member toward the clamped member. Since a gap is formed between the bolt screwing member and the clamped member from the start to the end of the bolt rotation operation at the head, the rotational movement of the bolt screwing member continues until the tightening of the bolt is completed. At this time, the bolt also rotates (swings) together with the bolt screwing member. Therefore, the head of the bolt moves toward the end of the U-shaped notch that is the first pin side in association with the swinging of the bolt screwing member.
As a result, the shank of the bolt is pulled toward the first pin within the U-shaped cutout, making it difficult for the bolt to come out of the U-shaped cutout.

In addition, because the bolt screwing member does not come into contact with the clamped member when the bolt is tightened, the pivoting movement of the first clamping member rotating about the first pin member is not impeded by the bolt screwing member. Therefore, a rotational moment about the first pin member continues to act on the first clamping member until tightening of the bolt is completed, so that the clamped member can be firmly clamped by the first clamping member and the second clamping member.
Therefore, according to the present invention, it is possible to provide a clamp in which the bolt shaft is unlikely to come out of the U-shaped notch and which is capable of firmly clamping a clamped member.

FIG. 1 is a front view of a single clamp clamping a pipe member. FIG. 2 is a cross-sectional view of a single clamp clamping a pipe member. FIG. 3 is a perspective view of a single clamp. FIG. 4 is a perspective view of the single clamp showing a state in which the bolts are removed and the cover member is open. FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is a front view of the single clamp with a part of the cover member cut away. FIG. 8 is a front view of a single clamp clamping a pipe member having a small outer diameter. FIG. 9 is a cross-sectional view of a single clamp showing a modified example of the bolt screwing member. FIG. 10 is a perspective view showing another modified example of the bolt screwing member. FIG. 11 is a front view of the orthogonal clamp clamping a pipe member. FIG. 12 is a front view of the flexible clamp clamping a pipe member. FIG. 13 is a front view of the wall ties after they have been installed on a wall. FIG. 14 is a front view of a conventional clamp.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a clamp according to the present invention will now be described in detail with reference to FIGS.
1 is what is called a single clamp, and includes a main body member 23 as a first clamping member that clamps a pipe member 22 as a clamped member, and a cover member 24 as a second clamping member. This clamp 21 is used to fix a functional part 25 attached to the main body member 23 to the pipe member 22. Although not shown in detail, the functional part 25 is, for example, a hook for attaching a wire or a bracket for attaching a part used in temporary scaffolding.

The main body member 23 and the cover member 24 are each formed into a predetermined shape by pressing a metal plate, and one end 23a, 24a of each is rotatably connected to the other by a first pin member 26. As shown in FIG. 5, the main body member 23 has a horizontal wall 31 extending in the axial direction of the first pin member 26, and a pair of vertical walls 32, 32 formed by bending both ends of the horizontal wall 31. The cover member 24 has a horizontal wall 33 extending in the axial direction of the first pin member 26, and a pair of vertical walls 34 formed by bending both ends of the horizontal wall 33.

The first pin member 26 is rotatably passed through a first through hole 35 formed in each of the pair of vertical walls 32 of the main body member 23 and a second through hole 36 formed in each of the pair of vertical walls 34 of the cover member 24. The main body member 23 and the cover member 24 are configured to sandwich the pipe member 22 with the vertical walls 32, 34 in contact with the outer circumferential surface of the pipe member 22.
As shown in Fig. 2, the other end 23b of the main body member 23 is formed by a pair of vertical walls 32. A bolt screwing member 38 is rotatably connected to the other end 23b by a second pin member 37. The second pin member 37 is rotatably passed through a third through hole 39 formed in the other end 23b (vertical wall 32) of the main body member 23 as shown in Fig. 6.

The bolt screwing member 38 is a member into which a bolt 41 is screwed in order to clamp the body member 23 and the cover member 24 of this clamp 1 to the pipe member 22. As shown in FIG. 4, the bolt 41 is composed of a shaft portion 42 having a male thread 41a formed thereon, and a head portion 43 provided at one end of the shaft portion 42. The head portion 43 is formed of a tool engaging portion 43a formed in a hexagonal prism shape when viewed from the axial direction of the shaft portion 42, and a disk-shaped washer portion 43b provided at the boundary with the shaft portion 42.

As shown in FIG. 4, the bolt screwing member 38 according to this embodiment is composed of a connecting portion 38a inserted between a pair of vertical walls 32 of the main body member 23, and a female threaded portion 38b having a female threaded hole 44 into which the shaft portion 42 of the bolt 41 is screwed. The shaft portion 42 of the bolt 41 is screwed into the female threaded hole 44 from the side of the cover member 24. The bolt screwing member 38 according to this embodiment is manufactured by forging, casting, or sintered metal. Therefore, the connecting portion 38a and the female threaded portion 38b are integrally formed from the same metal material.

2 and 6, a fourth through hole 45 is formed in the connecting portion 38a, through which the second pin member 37 is rotatably passed. The position of the fourth through hole 45, in other words, the position where the second pin member 37 is disposed after being passed through the fourth through hole 45, is located away from the female thread hole 44 toward the pipe member 22.
4, a reinforcing rib 46 is provided so as to connect to the female thread portion 38b in the center of the connecting portion 38a in the axial direction of the second pin member 37. A side surface 46a of the reinforcing rib 46 facing the pipe member 22, i.e., a side surface of the bolt screwing member 38 facing the pipe member 22, is inclined in a direction away from the pipe member 22 as it extends from the second pin member 37 side to the head 43 side of the bolt 41, as shown in FIGS.

4, a U-shaped notch 51 is formed in the other end 24b of the cover member 24. The U-shaped notch 51 is formed in the other end 24b of the cover member 24 so that the side of the first pin member 26 is closed and the side opposite the first pin member 26 is open, and the U-shaped notch 51 extends a predetermined length in the longitudinal direction of the cover member 24 with an opening width that allows the shaft 42 of the bolt 41 to be inserted. This predetermined length is longer than the outer diameter of the head 43 of the bolt 41.
This is the portion where the U-shaped notch 51 is formed at the other end 24b of the cover member 24, and on the side opposite the bolt screwing member 38, a flat bolt abutment surface 52 is formed for the washer portion 43b of the head 43 of the bolt 41 to abut against.

To clamp the clamp 21 configured in this manner to the pipe member 22, first, with the bolt 41 removed from the bolt screwing member 38 and the lid member 24 open as shown in Figure 4, the pipe member 22 is inserted between the body member 23 and the lid member 24. Next, the lid member 24 is placed over the pipe member 22, and the shaft 42 of the bolt 41 is inserted into the U-shaped notch 51 and the bolt 41 is screwed into the bolt screwing member 38 as shown in Figure 7.

7 shows the state at the start of tightening the bolt 41 by screwing the bolt 41 into the bolt screwing member 38 until the head 43 of the bolt 41 abuts on the cover member 24. At this time, i.e., at the start of the rotation operation of the bolt 41 at the head 43, a gap S1 is generated between the bolt screwing member 38 and the pipe member 22.
In this state, when the bolt 41 is rotated at the head 43 of the bolt 41, an attractive force F acts on the bolt screwing member 38 into which the shaft 42 of the bolt 41 is screwed, toward the head 43. To rotate the bolt 41, a tool 53 is engaged with the head 43 and turned. The tool 53 may be a manual ratchet wrench or an electric wrench (power tool).

The position at which the second pin member 37 that connects the bolt screwing member 38 to the main body member 23 is positioned is offset by a distance L toward the pipe member 22 with respect to the bolt axis A of the bolt 41 whose shaft portion 42 is screwed into the bolt screwing member 38. For this reason, a rotational moment M1 is applied to the bolt screwing member 38 toward the pipe member 22, centered on the second pin member 37, due to the attractive force F. As a result of the rotational moment M1 acting on the bolt screwing member 38 in this way, the bolt screwing member 38 rotates toward the pipe member 22, centered on the second pin member 37.

As a result, the bolt 41, whose shaft portion 42 is screwed into the bolt screwing member 38, also rotates (swings) integrally with the bolt screwing member 38 toward the pipe member 22 around the second pin member 37. As a result, the shaft portion 42 of the bolt 41 moves inside the U-shaped cutout 51 toward the first pin member 26, as shown by the two-dot chain line in FIG. 7. By continuing to screw the bolt 41 into the bolt screwing member 38, the shaft portion 42 of the bolt 41 moves even closer to the pipe member 22, and it is also possible for the shaft portion 42 to reach the end portion 51a of the U-shaped cutout 51 on the side of the first pin member 26.

The screwing of the bolt 41, i.e., the rotation of the bolt 41 by the tool 53, ends when the rotation of the bolt 41 at the head 43 becomes impossible. When the rotation becomes impossible, this means when the tool 53 (e.g., a manual ratchet wrench) can no longer be physically turned, or when the rotation by the power tool reaches the limit of the tightening torque value set for the power tool.
When the rotation operation of the bolt 41 is completed, as shown in FIG. 2, the shaft portion 42 of the bolt 41 can reach the closed end portion 51a of the U-shaped notch 51 on the side of the first pin member 26.

It is desirable that the tightening torque applied to the bolt 41 when the bolt 41 cannot be rotated be between the lower and upper limits of a predetermined appropriate value. In the clamp 21 according to this embodiment, the shaft 42 is configured to be located at or near the end 51a of the U-shaped notch 51 on the side of the first pin member 26 when the tightening torque of the bolt 41 is between the lower and upper limits of the appropriate value.

As shown in Figures 1 and 2, even when the rotation of the bolt 41 is completed, a gap S1 is generated between the bolt screwing member 38 and the pipe member 22. That is, in this clamp 21, a gap S1 is generated between the bolt screwing member 38 and the pipe member 22 from the start to the end of the rotation of the bolt 41 at the head 43. If the bolt screwing member 38 comes into contact with the pipe member 22 during the rotation of the bolt 41, the bolt screwing member 38 will no longer rotate around the second pin member 37 toward the pipe member 22 after this contact, and the shaft 42 of the bolt 41 will no longer be able to move any further toward the first pin member 26 within the U-shaped notch 51.

However, in the clamp 21 of this embodiment, a gap S1 is created between the bolt screwing member 38 and the pipe member 22 from the start to the end of the rotation operation of the bolt 41, and the rotation of the bolt screwing member 38 is not restricted by the pipe member 22, so it is possible to move the shaft 42 of the bolt 41 through the U-shaped notch 51 toward the first pin member 26 until the screwing is completed.

In this way, in the clamp according to this embodiment, tightening the bolt 41 moves the shaft 42 of the bolt 41 toward the first pin in the U-shaped notch, preventing the shaft 42 of the bolt 41 from moving toward the end of the U-shaped notch 51 opposite the first pin member 26, i.e. preventing the shaft 42 of the bolt 41 from coming out of the U-shaped notch 51.

Also, as shown in Figure 7, when an attractive force F acts on the bolt screw-in member 38, a rotational moment M2 acts on the main body member 23 via the bolt screw-in member 38 in a direction in which the main body member 23 closes relative to the cover member 24 around the first pin member 26. This rotational moment M2 causes the main body member 23 to rotate around the first pin member 26 in a direction in which it closes relative to the cover member 24, and the main body member 23, together with the cover member 24, clamps and tightens the pipe member 22.

If the bolt screwing member 38 comes into contact with the pipe member 22 during this tightening, the friction between the bolt screwing member 38 and the pipe member 22 will prevent the main body member 23 from rotating around the first pin member 26, or will barely rotate at all. This makes it difficult to tighten the pipe member 22 between the main body member 23 and the cover member 24 with a large force. However, in the clamp 21 according to this embodiment, there is a gap S1 between the bolt screwing member 38 and the pipe member 22, and this gap S1 is maintained even during the tightening, so the bolt screwing member 38 can continue to rotate around the first pin member 26 in the closing direction relative to the cover member 24. This means that by rotating the head 43 of the bolt 41 to the end, it becomes possible to tighten the pipe member 22 between the main body member 23 and the cover member 24 with a large force.

Therefore, according to this embodiment, it is possible to provide a clamp that makes it difficult for the shaft portion 42 of the bolt 41 to come out of the U-shaped notch portion 51 and can firmly tighten the pipe member 22.

In the clamp 21 according to this embodiment, the end of the rotation of the bolt 41 at the head 43 is when the rotation of the bolt 41 at the head 43 becomes impossible, as described above. This allows the shaft 42 of the bolt 41 to be brought as close as possible to the end of the first pin member 26 side in the U-shaped notch 51, making it even more difficult for the shaft 42 of the bolt 41 to come out of the U-shaped notch 51, and allowing the pipe member 22 to be tightened even more firmly by the main body member 23 and the cover member 24.

In addition, in this embodiment, when an electric wrench (electric tool) is used, the moment when the head 43 of the bolt 41 becomes unable to rotate means, as described above, when the rotation operation by the electric wrench reaches the limit of the tightening torque value set in the electric tool. This makes it possible to prevent the tightening torque of the bolt 41 from varying for each clamp 21, making it easier to manage the tightening torque of the bolt 41.

In the clamp 21 according to this embodiment, the rotation of the bolt 41 at the head 43 ends when the shaft 42 of the bolt 41 reaches the end 51a on the side of the first pin member 26 in the U-shaped notch 51. The end 51a on the side of the first pin member 26 in the U-shaped notch 51 is the strongest part of the U-shaped notch 51 because this end 51a is the closed end of the U-shaped notch 51. Therefore, in order to clamp the pipe member 22 between the body member 23 and the cover member 24 with a large force, the head 43 of the bolt 41 can be rotated at the strongest part, thereby making it possible to tighten the clamping state of the pipe member 22.

In the clamp 21 according to this embodiment, the surface of the bolt screwing member 38 that faces the pipe member 22 (side surface 46a of the reinforcing rib 46) is inclined away from the pipe member 22 as it extends from the second pin member 37 side toward the head 43 side of the bolt 41. This makes it possible to more reliably prevent the bolt screwing member 38 from coming into contact with the pipe member 22 when the bolt screwing member 38 rotates toward the pipe member 22 around the second pin member 37.

In this embodiment, the bolt screwing member 38 is directly provided with a female threaded hole 44 into which the shaft 42 of the bolt 41 is screwed. Therefore, compared to when the bolt screwing member 38 is formed by bending a plate material, the bolt screwing member 38 can be formed more robustly by forging, casting, or sintering metal.

In the clamp 21 according to this embodiment, the second pin member 37 is positioned toward the pipe member 22 from the female threaded hole 44 into which the shank 42 of the bolt 41 of the bolt screwing member 38 is screwed, relative to the bolt axis A. This allows the eccentricity distance L of the second pin member 37 relative to the bolt axis A to be large, making it possible to apply a large rotational moment M1 to the bolt screwing member 38. As a result, it becomes possible to more reliably bring the shank 42 of the bolt 41 closer to the end 51a of the U-shaped cutout 51 on the side of the first pin member 26.

(Modification of the Pipe Member)
The pipe member to be used may have a smaller diameter than the pipe member 22 shown in Figures 1 and 2. Figure 8 shows the clamp 21 clamping a small diameter pipe member. Figure 8 shows the state after the bolt rotation operation has been completed. The clamp 21 shown in Figure 8 is the same as that shown in Figures 1 to 7, and clamps a small diameter pipe member 61.
By clamping the small diameter pipe member 61 between the main body member 23 and the cover member 24, a gap S2 is created between the other end 23b of the main body member 23 and the small diameter pipe member 61 from the start to the end of the rotation operation of the bolt 41 at the head 43.

As a result, the rotational moment M2 about the first pin member 26 continues to act on the main body member 23 until the rotation of the bolt 41 is completed, and the main body member 23 rotates about the first pin member 26 in the closing direction relative to the cover member 24, cooperating with the cover member 24 to clamp and tighten the small diameter pipe member 22. Therefore, the clamp 21 according to this embodiment is capable of firmly clamping even a small diameter pipe member 61.

(Modification of the bolt screw-in member)
The bolt screwing member can be configured as shown in Figures 9 and 10. In Figures 9 and 10, members that are the same as or equivalent to those described with reference to Figures 1 to 7 are given the same reference numerals and detailed description thereof will be omitted as appropriate.
The bolt screwing member 62 shown in Figure 9 is composed of a female threaded member 64 having a female threaded hole 63 into which the shaft portion 42 of the bolt 41 is screwed, and a rotating member 65 to which the female threaded member 64 is fixed and which is freely rotatable around the second pin member 37.

The rotating member 65 shown in FIG. 9 differs from the female threaded portion 38b of the bolt screwing member 38 shown in the embodiment described above only in that a fifth through hole 67 is formed instead of the female threaded hole 44. The fifth through hole 67 penetrates the rotating member 65 formed in a block shape. The hole diameter of one end 67a of this fifth through hole 67 on the side of the cover member 24 is smaller than the other parts to prevent the female threaded member 64 from coming out. The female threaded member 64 can be a ready-made cylindrical product with a female threaded hole 63 formed therein, and this female threaded member 64 is pressed into the fifth through hole 67 from the other end thereof and fixed to the rotating member 65.

The bolt screwing member 71 shown in Figure 10 is composed of a nut 73 as an internally screwed member having an internally screwed hole 72 into which the shaft portion 42 of the bolt 41 is screwed, and a rotating member 74 to which the nut 73 is fixed and which is freely rotatable around the second pin member 37.
The rotating member 74 shown in Fig. 10 is formed into a predetermined shape by bending a metal plate, and has a pair of vertical walls 74a, 74a aligned in the axial direction of the second pin member 37, and a horizontal wall 74b connecting one ends of the vertical walls 74a, 74a. The distance between the pair of vertical walls 74a, 74a is such that the nut 73 can be engaged between the vertical walls 74a so as to enclose the nut 73 so as not to rotate. A sixth through hole 75 is formed in the horizontal wall 74b, into which the shaft portion 42 of the bolt 41 can be inserted.
The nut 73 is welded to the vertical wall 74a or the horizontal wall 74b in a state where one axial end of the female threaded hole 72 abuts against the horizontal wall 74b of the rotating member 74. Although not shown, by forming a protrusion on the vertical wall 74a to prevent the nut 73 from falling off, the nut 73 can be held on the rotating member 74 without welding.

Even if the bolt screwing members 62, 71 are configured as shown in Figures 9 and 10, the shaft portion 42 of the bolt 41 can be brought closer to the end 51a of the U-shaped cutout 51 by screwing it into the female threaded holes 63, 72, making it difficult for the shaft portion 42 of the bolt 41 to come out of the U-shaped cutout 51 and enabling the pipe member 22 to be firmly tightened.
Furthermore, by adopting the configuration shown in Figures 9 and 10, it is not necessary to machine a female threaded hole in a block-shaped bolt-insertion member, and therefore the bolt-insertion members 62, 71 can be manufactured more easily than in the case of adopting the embodiment shown in Figures 1 to 7.

(Another embodiment of the clamp)
The clamp 21 according to the present invention can be configured as shown in Figures 11 to 13. In Figures 11 to 13, members that are the same as or equivalent to those described with reference to Figures 1 to 7 are given the same reference numerals and detailed description thereof will be omitted as appropriate.
An orthogonal clamp 81 is shown in Figure 11, a universal clamp 82 is shown in Figure 12, and a wall tie 83 is shown in Figure 13.

The orthogonal clamp 81 shown in FIG. 11 and the flexible clamp 82 shown in FIG. 12 are each constructed using two clamps (single clamps) 21 shown in FIG. 1 to FIG. 7. The orthogonal clamp 81 shown in FIG. 11 is constructed by overlapping and joining two clamps 21 with the main body members 23 overlapping each other in a position in which the axes of the pipe members 22 are perpendicular to each other. The main body members 23 can be joined together, for example, by using rivets (not shown).

The flexible clamp 82 shown in FIG. 12 is constructed by connecting the main body members 23 of two clamps 21 with a connecting member 84. The connecting member 84 connects the main body members 23 to each other so that they can rotate freely. Therefore, the angle between the pipe member 22 clamped to one clamp 21 and the pipe member 22 clamped to the other clamp 21 can be any angle.

13 is for fixing a pipe member 22 to a wall 85 of a building. This wall connector 83 is composed of a support member 88 having a male thread member 87 that is screwed into an anchor 86 embedded in the wall 85, a slide member 89 movably fitted to this support member 88, and a clamp 21 welded to the tip of the slide member 89.
The orthogonal clamp 81, swivel clamp 82, and wall connector 83 constructed using the clamp 21 of the present invention make it more difficult for the bolt 41 to come loose than with conventional ones, and also firmly clamp the pipe member 22 to securely clamp the pipe member 22.

The present invention can be used as a clamp that clamps and secures pipe members of temporary structures such as scaffolding and shoring.

1...clamp, 22...pipe member which is the clamped member, 23...main body member which is the first clamped member, 24...cover member which is the second clamped member, 23a, 24a...one end, 23b, 24b...other end, 26...first pin member, 37...second pin member, 38...bolt screw-in member, 41...bolt, 42...shaft, 43...head, 44, 63, 72...female threaded hole, 46a...side surface which faces the clamped member, 51...U-shaped notch, 53...tool, 64...female threaded member, 65, 74...rotating member, 73...nut which is the female threaded member, A...bolt axis, S1, S2...gap.

Claims (9)

the bolt includes a first clamping member and a second clamping member, one end of each of which is rotatably connected to the other end of the first clamping member by a first pin member; a bolt screwing member rotatably connected to the other end of the first clamping member by a second pin member; and a bolt, the other end of the second clamping member having a U-shaped notch that is closed on the side of the first pin member and open on the side opposite the first pin member side, an shank being inserted into the bolt screwing member, the shank being screwed into the bolt screwing member, and the head of the bolt abutting against a portion of the other end of the second clamping member on the side opposite the bolt screwing member,
A clamp in which a clamped member is clamped between the first clamping member and the second clamping member by rotating the bolt at the head portion,
In a clamp, a position at which the second pin member is disposed with respect to a bolt axis line of the bolt having the shank screwed into the bolt screwing member is eccentric toward the clamped member,
A clamp, characterized in that a gap is generated between the bolt screwing member and the clamped member from the start to the end of the rotation operation of the bolt at the head. The clamp according to claim 1, wherein the end of the rotation of the bolt at the head is when the bolt can no longer be rotated at the head. 3. The clamp according to claim 2, wherein the rotation of the bolt at the head is performed by a power tool,
A clamp characterized in that the state where the bolt cannot be rotated at the head is when the rotational operation by the power tool reaches its limit. The clamp according to any one of claims 1 to 3, characterized in that the rotation of the bolt at the head is terminated when the shaft of the bolt reaches the end of the U-shaped notch on the side of the first pin member. The clamp according to claim 1, wherein the surface of the bolt screwing member that faces the clamped member is inclined in a direction away from the clamped member as it extends from the second pin member side toward the head side of the bolt. The clamp according to claim 1, characterized in that the bolt screwing member is provided directly with a female threaded hole into which the shaft of the bolt is screwed. The clamp according to claim 1, wherein the bolt screwing member includes a female threaded member having a female threaded hole into which the shaft of the bolt is screwed, and a rotating member to which the female threaded member is fixed and which is rotatable about the second pin member. The clamp according to claim 1, characterized in that a gap is generated between the other end of the first clamping member and the clamped member from the start to the end of the rotation operation of the bolt at the head. The clamp according to claim 1, characterized in that the position at which the second pin member is disposed is located away from the female threaded hole into which the bolt of the bolt screwing member is screwed, toward the clamped member.

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