Clamp for attaching separate components

Abstract

To provide a clamp for fitting another member applicable when incorporating another member, for example, a brace, to the steel pipe of a framework structure like a temporary scaffold.SOLUTION: A wedge body 5 has a tip end side slip-off preventing protrusion 7 at a tip end part 5a thereof. A tip end side wedge insertion hole 3 of a U-shaped body 2 is formed in a width allowing in-and-out of the tip end part 5a together with the tip end side slip-off preventing protrusion 7. A rear end side wedge insertion hole 4 of the U-shaped body 2 has a horizontal width not allowing passing of the tip end side slip-off preventing protrusion 7, and has a cutout recessed part 8 for passing and moving the tip end part 5a of the wedge body through the rear end side wedge insertion hole 4 in a lowered state to the lower end part of the rear end side wedge insertion hole 4. When a pressing member 6 is pivoted, a pivoting part 10 thereof enters the moving route of the tip end part 5a of the wedge body when putting in / out the tip end part 5a of the wedge body to / from the rear end side wedge insertion hole 4 by using the cutout recessed part 8.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a clamp for attaching a separate member that can be used when incorporating another member, such as a brace member, into a steel pipe of a frame structure like a temporary scaffold.

Background Art

[0002] When incorporating a brace member into a frame structure like a temporary scaffold, the ends of the diagonal brace members are overlapped on two vertical steel pipes that make up the frame structure, and a double pipe clamp formed by connecting two pipe clamps so as to be relatively rotatable is used to connect the vertical steel pipe and the ends of the brace members that obliquely overlap it, or the horizontal member connecting the two vertical steel pipes and the ends of the brace members are overlapped with each other and connected by bolts and nuts, etc. Such methods have been adopted.

Summary of the Invention

Problems to be Solved by the Invention

[0003] However, in the conventional methods as described above, there is a problem that it takes time to twist the fastening bolts provided in the pipe clamp or the bolts and nuts directly fastening the ends of the horizontal member and the brace member, and the work cannot be efficiently advanced. Of course, a wedge-type clamp that fastens by driving a wedge instead of a fastening bolt is also known, but in this wedge-type clamp, the driven wedge strongly slides on the peripheral surface of the steel pipe, and the wedge and the peripheral surface of the steel pipe are in a line contact state, and due to stress concentration at this line contact portion, not only the peripheral surface of the steel pipe is severely damaged, but there is also a risk of deformation and breakage of the wedge.

Means for Solving the Problems

[0004] The present invention proposes a clamp for attaching a separate component that can solve the conventional problems described above. To facilitate understanding of the relationship with the embodiments described later, the clamp for attaching a separate component according to the present invention is shown with reference numerals in parentheses, as used in the description of the embodiments, and comprises a U-shaped body (2) equipped with a separate component attachment part (1), a wedge body (5) used by passing through two wedge insertion holes (3, 4) provided in both arm parts (2a, 2b) of the U-shaped body (2), and inside the wedge body (5) In a clamp for attaching a separate member, the clamp is provided with a pressing member (6) pivotally supported on one arm portion (2b) of the U-shaped body (2) so as to be openable and closable, and the steel pipe (P) into which the U-shaped body (2) is fitted is clamped between the pressing member (6) and the curved bottom portion (2c) of the U-shaped body (2) by driving in the wedge body (5), the wedge body (5) is provided with a tip-side retaining projection (7) that protrudes laterally from the vertical side surface of the tip portion (5a) on the driving direction side, and of the two wedge insertion holes (3,4), the tip portion (5) of the wedge body (5) The front end wedge insertion hole (3) through which a) passes is formed to be wide enough for the front end (5a) of the wedge body (5) to move in and out together with the front end retaining projection (7), and the rear end wedge insertion hole (4) through which the rear end (5b) of the wedge body (5) passes has a width that prevents the front end retaining projection (7) of the wedge body (5) from passing through, and when the front end (5a) of the wedge body (5) is lowered to the lower end of the rear end wedge insertion hole (4) and moved through the rear end wedge insertion hole (4), the front end retaining projection (7) of the wedge body (5) does not pass through. A movable notched recess (8) is provided on the side surface near the lower end of the rear end wedge insertion hole (4), and the pivot support (10) of the pressing member (6) is provided on one side arm portion (2b) equipped with the rear end wedge insertion hole (4) at a position below the wedge body (5) when used for fastening steel pipes, and the pivot support (10) of the pressing member (6) is positioned within the movement path of the tip (5a) of the wedge body (5) when the tip (5a) of the wedge body (5) is moved in and out of the rear end wedge insertion hole (4) using the notched recess (8). [Effects of the Invention]

[0005] According to the above-described configuration of the present invention, during assembly, the tip of the wedge body is inserted from the rear end wedge insertion hole toward the inside of the U-shaped body before pivotally supporting the retaining member on the U-shaped body. At this time, the tip of the wedge body can be inserted toward the inside of the U-shaped body from the rear end wedge insertion hole by inserting and passing the tip-side retaining projection on the side of the tip of the wedge body through the notched recess provided in the rear end wedge insertion hole. After inserting the tip of the wedge body toward the inside of the U-shaped body from the rear end wedge insertion hole in this manner, the retaining member is pivotally supported on the U-shaped body. That is, the retaining member is inserted below the tip of the wedge body that has entered the inside of the U-shaped body, and the end portion constituting the pivot support portion of the retaining member is pivotally supported by a support shaft on one side arm portion of the U-shaped body that has a rear end wedge insertion hole, so as to be able to open and close.

[0006] In the clamp for attaching separate components of the present invention, which has been assembled as described above, if the wedge body, with both ends inserted into the wedge insertion holes in both arms of the U-shaped body, moves in the opposite direction to the normal wedge driving direction, the tip of the wedge body will come out of the tip-side wedge insertion hole to the inside of the U-shaped body. However, there is no risk of the wedge body falling out of the U-shaped body by the tip of the wedge body passing further outward from the inside through the rear-end wedge insertion hole. In other words, for the tip of the wedge to move through the rear end wedge insertion hole, the projection on the tip of the wedge that prevents it from coming loose must move through a notched recess provided near the lower end of the rear end wedge insertion hole. Since the pivot support of the retaining member is located within the movement path of the tip of the wedge at this time, as long as the retaining member is pivotally supported by the U-shaped body, the wedge cannot unexpectedly fall out of the U-shaped body, nor can the wedge be artificially removed from the U-shaped body.

[0007] The above-mentioned effects can be expected due to the presence of a tip-side retaining projection provided at the tip of the wedge body. With the configuration of the present invention described above, it is only necessary to use the notched recess provided near the lower end of the side of the rear-end wedge insertion hole of the U-shaped body to insert the tip of the wedge body equipped with the tip-side retaining projection into the inside of the U-shaped body through the rear-end wedge insertion hole, and then pivotally support the retaining member at a predetermined position on the U-shaped body. This eliminates the need to perform processing work to form the retaining projection on the tip of the wedge body, such as press forming of the projection or welding a separate member constituting the projection to the tip of the wedge body, as in the conventional method, and makes the assembly of the clamp for attaching the separate member simple and easy. In other words, a clamp for attaching a separate component can be easily, simply, and inexpensively obtained, in which the wedge is always integrated with the U-shaped body, eliminating the risk of the wedge unexpectedly falling off, and eliminating the need to prepare the wedge and assemble it into the U-shaped body when in use.

[0008] When implementing the present invention as described above, the wedge body (5) is formed in a gate-shaped cross-section, comprising a top plate portion (11) and side plate portions (12) that are bent downward from both left and right sides along the length of the top plate portion (11). An overhang portion (12a) is formed on the lower side of the side plate portion (12) at the tip portion (5a) of the wedge body (5), and the tip-side retaining projection (7) is formed at a position below the midpoint of the height of the tip portion (5a) including the overhang portion (12a) and below the rear end portion (5b) of the wedge body (5), a projection (17) can be provided projecting downward to raise the height of the rear end portion (5b) above the height of the rear end wedge insertion hole (4). With this configuration, even when the retaining projection at the tip is formed by press working, a sufficient surface area can be secured below the retaining projection at the tip. This not only facilitates the press working of the retaining projection at the tip, but also results in the lower edge of the wedge between the protruding part at the bottom of the tip and the projection at the bottom of the rear end being recessed inward. This minimizes the increase in weight of the wedge compared to increasing the overall height of the side plate portion of the wedge.

[0009] Furthermore, the U-shaped body (2) comprises a U-shaped strip plate portion (13) in which the wedge insertion holes (3,4) are provided and which is curved in a U shape, and left and right U-shaped side plate portions (14) which are bent inward from both the left and right sides of the U-shaped strip plate portion (13), and the retaining member (6) comprises a curved thick plate portion (15) which curves along the circumferential surface of the steel pipe (P) into which the U-shaped body (2) is fitted, and which is connected to one end of the curved thick plate portion (15) and the left and right U-shaped The retaining member (6) is composed of a pair of left and right bearing plate portions (16) located inside the U-shaped side plate portion (14), and a support shaft (9) passing through this pair of left and right bearing plate portions (16) is installed between the left and right U-shaped side plate portions (14) to form the pivot portion (10) of the retaining member (6), and the lower side of the wedge body (5) passing through the two wedge insertion holes (3,4) can be configured to be loosely fitted between the pair of left and right bearing plate portions (16) at the pivot portion (10) of the retaining member (6). With this configuration, compared to a pivot portion in which a cylindrical portion through which the support shaft passes is provided on one end of the retaining member, the height of the retaining member relative to the wedge body can be made slightly higher, and the overall structure can be made lighter and more compact. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a front view of one embodiment of the present invention in a state where the clamp for attaching a separate component is not being used. [Figure 2] Figure 2 is a right side view of Figure 1. [Figure 3] Figure 3 is a partially cutaway cross-sectional plan view showing the wedge body stretched between the two arm sections of the U-shaped main body. [Figure 4] Figure 4 is an exploded perspective view of the components excluding the wedge body. [Figure 5] Figure 5 is a longitudinal cross-sectional front view showing the first stage when the U-shaped body is fitted onto the steel pipe. [Figure 6] Figure 6 is a longitudinal cross-sectional front view showing the second stage described above. [Figure 7] Figure 7 is a longitudinal cross-sectional front view showing the U-shaped body fixed to a steel pipe with a wedge. [Figure 8]Figure 8 is a cross-sectional plan view showing the first step in assembling the clamp for attaching a separate component. [Figure 9] Figure 9 is a longitudinal cross-sectional front view showing the first stage described above. [Figure 10] Figure 10 is a cross-sectional plan view showing the operation of removing the wedge from the clamp used to attach a separate component that has been assembled. [Figure 11] Figure 11 is a front view of the same cross-section. [Figure 12] Figure 12 is a left side view of the main part of the same component. [Figure 13] Figure 13 is an elevation view showing one example of use of the clamp for attaching separate components according to the present invention. [Modes for carrying out the invention]

[0011] A preferred embodiment of the present invention will be specifically described below with reference to the attached Figures 1 to 7. The clamp for attaching a separate member of the present invention comprises a U-shaped body 2 equipped with a separate member attachment portion 1, a wedge body 5 used by passing through two wedge insertion holes 3 and 4 provided in both arm portions 2a and 2b of the U-shaped body 2, and a pressing member 6 pivotally supported on one arm portion 2b of the U-shaped body 2 so as to be openable and closable inside the wedge body 5. By driving in the wedge body 5, the steel pipe P into which the U-shaped body 2 fits is clamped between the steel pipe and the curved bottom portion 2c of the U-shaped body 2 via the pressing member 6.

[0012] The wedge body 5 has a gate-shaped cross-section, comprising a top plate portion 11 and side plate portions 12 that are bent downwards from both the left and right sides along the length of the top plate portion 11. An overhang portion 12a is formed on the lower side of the side plate portion 12 at the tip portion 5a of the wedge body 5, and a tip-side retaining projection 7 is provided at a position lower than the midpoint of the height of the tip portion 5a including the overhang portion 12a. Furthermore, a projection portion 17 is integrally formed on the side plate portion 12 at the rear end portion 5b of the wedge body 5, extending downwards flush with the rear end surface of the wedge body 5. In the illustrated embodiment, the overhang portion 12a and the projection portion 17 are provided in pairs symmetrically on the lower sides of the left and right side plate portions 12 of the wedge body 5, but they can also be provided on only one side plate portion 12. Furthermore, the tip-end retaining projection 7 may also be provided on both side plate portions 12, but in this embodiment, it is provided only on the side plate portion 12 which has one overhang portion 12a. This tip-end retaining projection 7 is formed by pressing outward from the inside of the side plate portion 12, so as to protrude in a hemispherical shape integrally with the side plate portion 12.

[0013] The U-shaped body 2 comprises a U-shaped strip plate portion 13, which is a strip plate with the wedge insertion holes 3 and 4 provided on it, curved into a U shape, and left and right U-shaped side plate portions 14 that are bent inward from both the left and right sides of the U-shaped strip plate portion 13. The retaining member 6 is composed of a curved thick plate portion 15 that curves along the circumferential surface of the steel pipe P into which the U-shaped body 2 is fitted, and a pair of left and right bearing plate portions 16 that are bent upward from both the left and right sides of the flat plate portion 15a at one end of the curved thick plate portion 15 and are adjacent to the inside of the left and right U-shaped side plate portions 14. A support shaft 9 that passes through this pair of left and right bearing plate portions 16 is installed between the left and right U-shaped side plate portions 14, forming the pivot portion 10 of the retaining member 6. Furthermore, the support shaft 9 is fixed to the arm portion 2b by a head 9a at one end and a post-formed retaining head 9b at the other end, with the support shaft 9 passing through shaft holes 23 provided concentrically in both the left and right U-shaped side plate portions 14. In addition, the support shaft through holes 18 provided in both the left and right bearing plate portions 16 are elongated holes that extend in an L-shape from the bearing plate portion 16 to the flat plate portion 15a, so that the support shaft 9 passing through them can be positioned at a low position so that it contacts the upper surface of the flat plate portion 15a of the retaining member 6.

[0014] The separate component mounting section 1 is configured to correspond to the separate component to be actually attached. In this embodiment, however, it is a gate-shaped structure in which the upper ends of a pair of side plate sections 20, each having bolt holes 19 concentrically provided, are connected by a connecting plate section 21 so that the ends of the brace material can be connected with connecting bolts and nuts. The longitudinal cross-section of this connecting plate section 21 in the direction in which the pair of side plate sections 20 are connected is concave to follow the curved surface of the curved bottom 2c of the U-shaped body 2, and the connecting plate section 21 is attached to the outside of the curved bottom 2c of the U-shaped body 2 in a state where they are in surface contact with each other. For this attachment, bolts and nuts passing through mounting through holes 22 provided in the center of the curved bottom 2c can also be used, but in this embodiment, the two are joined and integrated by welding around the contact surface of both.

[0015] The tip-side wedge insertion hole 3 provided in the U-shaped body 2 is formed to be wide enough for the tip portion 5a of the wedge body 5 to move in and out together with the tip-side retaining projection 7. The rear-side wedge insertion hole 4 through which the rear end portion 5b of the wedge body 5 passes is configured to have a width that prevents the tip-side retaining projection 7 of the wedge body 5 from passing through, and a height that includes a lower end portion 4a that extends downward from the lower side of the wedge body 5 when used for fastening steel pipes. Furthermore, a semicircular notched recess 8 is provided on the side surface near the lower end of the rear-side wedge insertion hole 4, allowing the tip portion 5a of the wedge body 5 to pass through when it is lowered to the lower end portion 4a of the rear-side wedge insertion hole 4. Furthermore, on both side plate portions 12 of the arm portion 2b, which is equipped with a wedge insertion hole 4 at the rear end of the U-shaped main body 2, shaft holes 23 for supporting the retaining member are provided concentrically at a position directly lateral to the lower end portion 4a of the wedge insertion hole 4 at the rear end.

[0016] The assembly method of the clamp for attaching a separate member according to the present invention having the above structure will be described. As shown in FIGS. 8 and 9, the tip 5a of the wedge 5 is inserted from the outside into the rear-end-side wedge insertion hole 4 of the U-shaped body 2. At this time, the tip 5a of the wedge 5 inserted into the rear-end-side wedge insertion hole 4 is lowered so that the anti-slip projection 7 on the tip side is located at the same height as the notch recess 8 provided at a position near the lower end of the side of the rear-end-side wedge insertion hole 4, and the anti-slip projection 7 on the tip side is operated to pass through the notch recess 8. After this, the pressing member 6 is pivotally supported on the U-shaped body 2. That is, the pressing member 6 is inserted below the tip 5a of the wedge 5 that has entered the inside of the U-shaped body 2 from the rear-end-side wedge insertion hole 4, and the pair of left and right bearing plate portions 16 of the pressing member 6 are positioned inside the shaft holes 23 provided in the side plate portions 12 of the arm portions 2b of the U-shaped body 2. In this state, the support shaft 9 is inserted into the shaft hole 23 and the support shaft through hole 18, and a retaining head 9b is formed at the tip of the support shaft 9 protruding from the side plate portion 12 of the arm portion 2b, and the arm portion 2b is sandwiched between the head 9a and the support shaft 9 is fixed. As a result, the pressing member 6 is attached to the U-shaped body 2 so as to be able to open and close vertically around the support shaft 9.

[0017] The clamp for attaching a separate member of the present invention configured as described above can be utilized, for example, as shown in FIG. 13, when incorporating a brace member 27 that obliquely connects and integrates both of the vertical columns 24a and 24b composed of a pair of left and right steel pipes P in a temporary scaffold frame structure 26 composed of horizontal connecting members 25 that connect and integrate these two columns 24a and 24b. An example of the procedure for incorporating the brace member 27 will be described. For example, two clamps C1 and C2 for attaching separate members are respectively attached to both ends of the brace member 27 in advance by connecting the ends of the brace member 27 to the separate member attachment portions 1 with bolts and nuts, and the clamps C1 and C2 for attaching separate members are coupled to the brace member upper end attachment position of one column 24a and the brace member lower end attachment position of the other column 24b, and the brace member 27 can be obliquely installed between both columns 24a and 24b.

[0018] A method of coupling the respective member attachment clamps C1 and C2 to the support columns 24a and 24b (steel pipes P) will be described based on FIGS. 5 to 7. As shown in FIG. 5, the wedge body 5 is pulled out to the limit position (a state where the tip-side retaining projection 7 of the wedge body 5 abuts against the side of the rear-end-side wedge insertion hole 4) on the side of the rear-end of one arm portion 2b of the U-shaped body 2, and the pressing member 6 is opened upward around the support shaft 9 to open the space between both arm portions 2a and 2b of the U-shaped body 2. In this state, the U-shaped bodies 2 of the respective member attachment clamps C1 and C2 are externally fitted to the support columns 24a and 24b (steel pipes P). Thereafter, as shown in FIG. 6, the pressing member 6 is closed downward around the support shaft 9 so that the support columns 24a and 24b (steel pipes P) are sandwiched between the curved thick plate portion 15 and the curved bottom portion 2c of the U-shaped body 2. Finally, with the tip portion 5a of the wedge body 5 inserted into the tip-side wedge insertion hole 3 of the other arm portion 2a of the U-shaped body 2 from the inside, the rear-end portion of the wedge body 5 is struck to drive in the wedge body 5. As a result, two locations in the length direction of the upper surface (the surface of the top plate portion 11) of the wedge body 5 are pressed upward against the upper side of the tip-side wedge insertion hole 3 and the upper side of the rear-end-side wedge insertion hole 4 of the U-shaped body 2, and the lower side (the lower sides of the left and right side plate portions 12) of the wedge body 5 is pressed downward against one location C on the curved surface of the curved thick plate portion 15 of the pressing member 6. As a result, the pressing member 6 sandwiches and fixes the support columns 24a and 24b (steel pipes P) between the curved bottom portion 2c of the U-shaped body 2, and the respective member attachment clamps C1 and C2 are fixed to the support columns 24a and 24b (steel pipes P) via the U-shaped body 2.

[0019] Furthermore, as shown in Figure 7, when the U-shaped body 2 is fixed to a steel pipe P of a predetermined diameter using the wedge 5, the position of the lower side of the wedge 5 is approximately constant. At this time, the wedge 5 is positioned above the support shaft 9 at the pivot support portion 10 of the retaining member 6. In addition, the pair of left and right bearing plates 16 at the pivot support portion 10 are positioned between the left and right side plates 12 of the wedge 5 and the U-shaped side plates 14 of the U-shaped body 2. Judging from this state, the lower side of the rear end wedge insertion hole 4 should be positioned slightly below the lower side of the wedge body 5 in this usage state. However, in the present invention, the position of the lower side of the rear end wedge insertion hole 4 is lowered, and the rear end wedge insertion hole 4 is configured to be vertically elongated so that it has a lower end portion 4a that protrudes relatively large below the lower side of the wedge body when used for fastening steel pipes. By lowering the tip portion 5a of the wedge body 5 to the lower end portion 4a of the rear end wedge insertion hole 4, the tip-side retaining projection 7 protruding from the side surface of the tip portion 5a of the wedge body 5 can be moved through a notched recess 8 provided on the side surface near the lower end of the rear end wedge insertion hole 4.

[0020] Therefore, when inserting the tip 5a of the wedge body 5 into the rear end wedge insertion hole 4 before the retaining member 6 is pivotally supported on the U-shaped main body 2, that is, when the pivot support portion 10 of the retaining member 6 does not exist, the tip 5a of the wedge body 5 is lowered to a height where it is in contact with the lower end of the rear end wedge insertion hole 4, thereby allowing the tip-side retaining projection 7 on the side of the tip 5a of the wedge body 5 to pass through into the notched recess 8 provided on the side surface near the lower end of the rear end wedge insertion hole 4. As a result, before attaching the retaining member 6 to the U-shaped body 2, the tip 5a of the wedge body 5 is inserted into the inside of the U-shaped body 2 through the rear end wedge insertion hole 4 using the notched recess 8. Once inserted, the wedge body 5 can be moved upward within the rear end wedge insertion hole 4, allowing the retaining member 6 to be pivotally supported on the U-shaped body 2 by the support shaft 9 while the wedge body 5 is raised.

[0021] In other words, according to the configuration of the present invention, after inserting the tip portion 5a of the wedge body 5 into the inside of the U-shaped body 2 through the rear end wedge insertion hole 4, the retaining member 6 is pivotally supported at a predetermined position on the U-shaped body 2, thereby obtaining a clamp for attaching a separate component in which the wedge body 5 is integrated with the U-shaped body 2, and there is no risk of the wedge body 5 unexpectedly falling out of the U-shaped body 2. However, after inserting the tip portion of the wedge body 5, which does not have the tip-side retaining projection 7, into the inside of the U-shaped body 2 through the rear end wedge insertion hole 4, it is possible to fix, for example, a separate component to the tip portion 5a of the wedge body 5 located between the two arm portions 2a and 2b of the U-shaped body 2 by welding, and to provide a retaining projection that protrudes from the side of the tip portion 5a. However, compared to such a conventionally conceivable configuration, according to the configuration of the present invention, the work of assembling the clamp for attaching a separate component with the U-shaped body, the retaining member, and the wedge body can be performed extremely simply and easily. [Industrial applicability]

[0022] The clamp for attaching other components according to the present invention can be used when incorporating other components, such as bracing materials, into steel pipes of a frame structure such as temporary scaffolding. [Explanation of Symbols]

[0023] 1. Mounting section for separate components 2 U-shaped body 2a, 2b Arm section 2c Curved bottom 3. Wedge insertion hole on the tip side 4. Wedge insertion hole on the rear end side 4a Bottom end 5 Cuneiform 5a Tip 5b Rear end 6. Retaining member 7. Protrusion for preventing detachment at the tip. 8 Notched recess 9 Spindle 9a head 9b Post-molded retaining head 10. Pivot support of the retaining member 11 Top panel 12 Side plate part 12a Overhang 13 U-shaped strip plate section 14 U-shaped side plate 15. Curved thick plate section 15a Flat plate part 16 Bearing plate section 17 Protrusion 18 Support shaft through hole 19 bolt holes 20 Pair of side plate sections 21 Concave curved connecting plate section 22 Through-holes for mounting 23 Shaft hole 24a, 24b Vertical support columns 25 Horizontal connecting member 26. Temporary scaffolding framework structure 27 Brace material C1, C2 Clamps for attaching separate components P steel pipe

Claims

1. A clamp for attaching a separate component comprises a U-shaped body with a separate component attachment section, a wedge body used by passing through two wedge insertion holes provided on both arms of the U-shaped body, and a pressing member pivotally supported on one arm of the U-shaped body inside the wedge body so as to be openable and closable, wherein the steel pipe into which the U-shaped body is fitted is clamped between the steel pipe and the curved bottom of the U-shaped body via the pressing member by driving in the wedge body, wherein the wedge body has a tip-side retaining projection that protrudes laterally from the vertical side of the tip on the driving direction side, and of the two wedge insertion holes, the tip-side wedge insertion hole through which the tip of the wedge body passes is formed to be wide enough so that the tip of the wedge body can be inserted and removed together with the tip-side retaining projection, A clamp for attaching a separate member, wherein the rear end of the wedge body passes through a rear-end wedge insertion hole, the hole has a width that prevents the tip-side retaining projection of the wedge body from passing through, and when the tip of the wedge body is lowered to the lower end of the rear-end wedge insertion hole and moved through the rear-end wedge insertion hole, a notched recess is provided on the side surface near the lower end of the rear-end wedge insertion hole through which the tip-side retaining projection of the wedge body passes, and the pivot support of the pressing member is provided on one side of the arm portion equipped with the rear-end wedge insertion hole, at a position below the wedge body when used for fastening steel pipes, and the pivot support of this pressing member is located within the movement path of the tip of the wedge body when the tip of the wedge body is moved in and out of the rear-end wedge insertion hole using the notched recess.

2. The wedge body has a gate-shaped cross-section comprising a top plate portion and side plate portions bent downward from both left and right sides along the length of the top plate portion, an overhang portion is formed on the lower side of the side plate portion at the tip of the wedge body, the tip-side retaining projection is formed at a position below the overhang portion, which is lower than the midpoint of the height of the tip portion including the overhang portion, and a projection is provided on the lower side of the rear end of the wedge body that protrudes downward to raise the height of the rear end above the height of the rear end wedge insertion hole, as described in claim 1.

3. The clamp for attaching a separate member according to claim 1 or 2, wherein the U-shaped body comprises a U-shaped strip plate portion in which a strip plate having a wedge insertion hole is curved in a U shape, and left and right U-shaped side plate portions bent inward from both left and right sides of the U-shaped strip plate portion, and the pressing member comprises a curved thick plate portion that curves along the circumferential surface of a steel pipe into which the U-shaped body is fitted, and a pair of left and right bearing plate portions connected to one end of the curved thick plate portion and located inside the left and right U-shaped side plate portions, and a support shaft passing through the left and right pair of bearing plate portions is installed between the left and right U-shaped side plate portions to form the pivot support portion of the pressing member, and the lower side of the wedge body is configured to be loosely fitted between the left and right pair of bearing plate portions at the pivot support portion of the pressing member.

Images