Clamping device for torsion test of box-shaped piece

Abstract

The utility model relates to a clamping device for a box-shaped piece torsion test, the clamping device comprises a first clamp body, a second clamp body and a base, the first clamp body is jointed to the base at the top of the base, the first clamp body is provided with a first accommodating groove, and the second clamp body is provided with a second accommodating groove. By means of the first clamp body and the second clamp body, the two ends of the box-shaped piece to be tested can be detachably clamped in the first containing groove and the second containing groove respectively, so that the box-shaped piece can be stably and firmly fixed, the accuracy of test data of a torsion test is guaranteed, and the test efficiency is improved. And such a configuration of the clamping device contributes to rapid installation and removal of the box.

Description

Technical Field

[0001] This utility model relates to the technical field of testing plastic products, and in particular to a clamping device for testing the torque of box-shaped parts. Background Technology

[0002] The content in this section only provides background information related to this utility model and may not constitute prior art.

[0003] Plastic products, such as plastic boxes, are ubiquitous necessities in daily life. The materials used to manufacture plastic boxes affect their various properties. Manufacturers typically produce multiple plastic boxes made of different materials in advance and conduct various performance tests on these boxes, such as torsion tests. Ultimately, based on the test data, they determine the material with the best performance from among many materials and then use that material in production to manufacture plastic boxes.

[0004] Torque testing of plastic boxes is generally performed using a torque tester. To ensure the accuracy of the test data, the plastic box needs to be kept stable and the test contact surface between the torque tester and the plastic box needs to be uniform during the test. Therefore, suitable fixtures are required to meet these requirements. Utility Model Content

[0005] Therefore, one objective of this utility model is to provide a clamping device for testing the torque of box-shaped parts that can stably and reliably hold them, thereby ensuring the accuracy of the test data.

[0006] Another objective of this invention is to provide a clamping device for testing the torque of a box-shaped component, which can ensure uniform contact between the box-shaped component and the clamping device and facilitate the quick installation and removal of the box-shaped component.

[0007] Another objective of this invention is to provide a clamping device for testing the torque of box-shaped parts that can be adapted to a dedicated torque tester.

[0008] This utility model provides a clamping device for testing the torque of a box-shaped component. The clamping device includes a first clamping body, a second clamping body, and a base. The first clamping body is engaged with the base at the top. The first clamping body has a first receiving groove, and the second clamping body has a second receiving groove. The two ends of the box-shaped component to be tested are adapted to be received in the first receiving groove and the second receiving groove, respectively, so that the box-shaped component is detachably clamped between the first clamping body and the second clamping body.

[0009] In some embodiments, the first opening of the first receiving groove is configured to be rectangular, and the first receiving groove has a first gap portion extending in the depth direction of the first receiving groove at at least one first corner of the first opening; and the second opening of the second receiving groove is configured to be rectangular, and the second receiving groove has a second gap portion extending in the depth direction of the first receiving groove at at least one second corner of the second opening.

[0010] In some embodiments, the first gap is formed by a portion of the inner wall of the first receiving groove recessing inward from the first corner of the first opening; and the second gap is formed by a portion of the inner wall of the second receiving groove recessing inward from the second corner of the second opening.

[0011] In some embodiments, the base has a clamping opening, the first clamping part includes a first snap-fit ​​portion and a neck, the first snap-fit ​​portion is provided with a first receiving groove, the neck is configured to be recessed inward from both sides relative to the first snap-fit ​​portion and adapted to be clamped in the clamping opening, and the first snap-fit ​​portion contacts the top surface of the base located at the clamping opening.

[0012] In some embodiments, the first clamping body further includes a second latching portion connected to the first latching portion via a neck, and the second latching portion contacts the bottom surface of the base located at the clamping opening.

[0013] In some embodiments, the second clamping device further has an engagement portion connected to and extending from the outer bottom surface of the second receiving groove, the engagement portion having a third receiving groove adapted to engage with a torque tester.

[0014] In some embodiments, the third opening of the third receiving groove is configured to be rectangular, and the third receiving groove has a third gap extending in the depth direction of the third receiving groove at at least one third corner of the first opening.

[0015] In some embodiments, the base includes a body having a clamping opening extending through two lateral sides of the body, and the body having a receiving space below the clamping opening communicating with the clamping opening for installing and removing the first clamping body.

[0016] In some embodiments, the body is composed of a first vertical segment and a second vertical segment, and the first vertical segment and the second vertical segment are configured to form a clamping opening and a receiving space between them.

[0017] In some embodiments, the first vertical segment includes a first docking portion, a first vertical portion, and a first horizontal structural portion connected to each other, and the second vertical segment includes a second docking portion, a second vertical portion, and a second horizontal structural portion connected to each other, wherein the bottom surface of the first docking portion contacts the top surface of the second docking portion, the first vertical portion and the second vertical portion are arranged parallel to each other and opposite to each other to form a receiving space between them, and the first horizontal structural portion and the second horizontal structural portion are arranged parallel to each other and opposite to each other to form a clamping orifice between them.

[0018] According to the clamping device for torque testing of a box-shaped component of this application, the clamping device includes a first clamping body, a second clamping body, and a base. The first clamping body is engaged with the top of the base and has a first receiving groove, and the second clamping body has a second receiving groove. By means of the second clamping body and the second clamping body, the two ends of the box-shaped component to be tested can be clamped in the first receiving groove and the second receiving groove respectively, so as to stably and securely fix the box-shaped component, thereby ensuring the accuracy of the torque test data. Furthermore, the first and second openings of the first and second receiving grooves are each constructed as rectangles adapted to the shape of the box-shaped component, thereby ensuring uniform contact between the box-shaped component and the clamping device. Further, the first and second openings have gaps at their respective corners, thereby facilitating the quick installation and removal of the box-shaped component relative to the first and second receiving grooves. Furthermore, the first clamp has a first engaging portion, a neck, and a second engaging portion. The neck is clamped in the clamping opening of the base, and the first and second engaging portions contact the top and bottom surfaces forming the clamping opening, respectively, thereby further ensuring the clamping firmness of the box-shaped component and the transmission of force. Additionally, the second clamp also includes a joint with a third receiving groove suitable for engagement with a torque tester, thus enabling it to be adapted to a dedicated torque tester. Attached Figure Description

[0019] The embodiments of the present invention will be described below by way of example only with reference to the accompanying drawings. In the drawings, the same features or parts are indicated by the same reference numerals, and the drawings are not necessarily drawn to scale. In the drawings:

[0020] Figure 1 A schematic diagram is shown of a clamping device for torque testing of a box-shaped component according to an embodiment of this application, in which a box-shaped component to be tested is clamped.

[0021] Figure 2 It shows Figure 1 A schematic diagram of the first clamping device of the clamping device from one perspective.

[0022] Figure 3 It shows Figure 2 The first clamp in the diagram is shown from another perspective.

[0023] Figure 4 It shows Figure 2 A schematic diagram of the second clamping device of the clamping device from one perspective.

[0024] Figure 5 It shows Figure 4 The second clip in the diagram is shown from another perspective. Detailed Implementation

[0025] The following description is exemplary in nature and is not intended to limit the invention, its application, or its uses. It should be understood that in all these figures, similar reference numerals indicate the same or similar parts and features. The figures only schematically illustrate the concept and principles of embodiments of the invention and do not necessarily show the specific dimensions and scale of each embodiment. Certain parts of specific figures may be depicted in an exaggerated manner to illustrate relevant details or structures of embodiments of the invention.

[0026] In the description of the embodiments of this utility model, the directional terms related to "upper," "lower," "top," and "bottom" are used to describe the positions or orientations shown in the accompanying drawings. In practical applications, the above-mentioned positional relationships used herein can be limited according to actual circumstances, and it is understood that these relationships can be reversed. In this document, the X direction refers to the direction parallel to the length / extension direction of the box-shaped member, wherein the box-shaped member is clamped in the clamping device according to the embodiment of this application, and the Y direction is perpendicular to the X direction, and the X and Y directions are in... Figure 1 As shown in the image.

[0027] The following will combine Figures 1 to 5 Various embodiments of the clamping device for torque testing of box-shaped parts according to this application will be described.

[0028] Figure 1 This is a schematic diagram of a clamping device 1 for torque testing of a box-shaped component, according to an embodiment of this application, holding a box-shaped component 2 to be tested. In this embodiment, the box-shaped component 2 may be made of plastic. Figure 2 yes Figure 1 A schematic diagram of the first clamping device in the clamping mechanism. Figure 4 yes Figure 1 A schematic diagram of the second clamp of the clamping device in the diagram.

[0029] like Figure 1As shown, the clamping device 1 for testing the torque of a box-shaped component includes a first clamping body 11, a second clamping body 12, and a base 13. The box-shaped component 2 to be tested is detachably clamped between the first clamping body 11 and the second clamping body 12. The first clamping body 11 is detachably engaged to the top of the base 13, so that the base 13 can support the entire clamping device 1. Figure 1 It is also shown that one end of the second clamping body 12 of the clamping device 1 (i.e., the end not used for clamping the box-shaped piece) is detachably engaged with the torque tester 3. The specific structures of the first clamping body 11 and the second clamping body 12 will be described below. It should be noted that, for ease of explanation, Figure 1 Only a portion of the torque tester 3 is schematically shown, which has a force-transmitting part (not shown) for engaging with the second clamp 12. Figure 2 and Figure 4 As shown, the first clamping body 11 has a first receiving groove 111, and the second clamping body 12 has a second receiving groove 121. The first receiving groove 111 has a first opening 112 for receiving one end of the box-shaped member 2, and the other end of the first receiving groove 111 may be closed. The second receiving groove 121 has a second opening 122 for receiving the other end of the box-shaped member 2, and the other end of the second receiving groove 121 may also be closed. When clamping the box-shaped member 2, one end of the box-shaped member 2 passes through the first opening 112 of the first receiving groove 111 and is in complete contact with the inner bottom surface of the first receiving groove 111, and the other end of the box-shaped member 2 passes through the second opening 122 of the second receiving groove 121 and is in complete contact with the inner bottom surface of the second receiving groove 121, so as to ensure the transmission of force between the clamping device and the box-shaped member and the clamping stability of the box-shaped member. The two ends of the box-shaped member 2 are clamped by means of the first receiving groove 111 and the second receiving groove 121 respectively. This clamping device can stably and securely hold the box-shaped component 2, ensuring the accuracy of the test data. For example... Figure 1As shown, when the box-shaped component 2 is mounted on the clamping device, it can be oriented horizontally (i.e., along the X direction) between the first clamping body 11 and the second clamping body 12. That is, the first clamping body 11 and the second clamping body 12 are arranged along the length of the box-shaped component 2. It is understood that the first receiving groove 111 and the second receiving groove 121 are arranged at the same height in the Y direction to facilitate horizontal clamping of the box-shaped component 2 between them. In this embodiment, the first clamping body 11 and the second clamping body 12 are two independent components, i.e., they are not connected. Furthermore, the first receiving groove 111 and the second receiving groove 121 are respectively matched to the size and shape of the two ends of the box-shaped component 2 to be tested, preferably with a clearance fit, so that the two ends of the box-shaped component 2 are received in the first receiving groove 111 and the second receiving groove 121 with essentially no clearance, thereby achieving good surface contact and force transmission.

[0030] Figure 3 and Figure 4 Exemplary structures of the first receiving groove 111 and the second receiving groove 121 are shown respectively. In the embodiments of this application, the box-shaped member 2 can be a cuboid as a whole, that is, the cross-section of the box-shaped member 2 is rectangular. Accordingly, as Figure 3 As shown, the first opening 112 of the first receiving groove 111 is configured as a rectangle adapted to the shape of the box-shaped member 2, and the first receiving groove 111 has a first gap portion 113 extending in the depth direction of the first receiving groove 111 at at least one first corner C1 of the first opening 112. It is understood that the depth direction of the first receiving groove 111 is parallel to the X direction. For example, the first receiving groove 111 may have a first gap portion 113 at all four first corners C1 of the first opening 112. Optionally, the first gap portion 113 may be formed by a portion of the inner wall of the first receiving groove 111 recessed inward from the first corner C1. Further, as shown... Figure 3 As shown, the cross-section of the first gap 113 can be an incomplete circle, that is, the first gap 113 is configured as an incomplete cylindrical space. By providing the first gap 113, the box-shaped member 2 can be quickly installed and removed relative to the first receiving groove 111, avoiding unnecessary interference. A structure similar to the first receiving groove 111 described above, such as... Figure 4As shown, to facilitate the quick installation and removal of the box-shaped member 2 relative to the second receiving groove 121, the second opening 122 of the second receiving groove 121 can also be constructed as a rectangle, and the second receiving groove 121 can also have a second gap portion 123 extending in the depth direction of the second receiving groove 121 at at least one second corner C2 of the second opening 122. Similarly, the second receiving groove 121 can also have a second gap portion 123 at each of the four second corners C2 of the first opening 112, and the second receiving groove 121 can also be formed by a portion of the inner wall of the second receiving groove 121 recessed inward from the second corner C2. Furthermore, as... Figure 4 As shown, the cross-section of the second gap 123 can also be an incomplete circle.

[0031] The following will refer to Figure 2 and Figure 3 The following describes a structural embodiment of the first clamping body 11.

[0032] As an example, the first clamping unit 11 can be constructed as a structure having a substantially "T"-shaped longitudinal cross-section. Specifically, as... Figure 2 As shown, the first clamping body 11 may include a first engaging portion 114 and a neck 115 for forming the aforementioned "T"-shaped structure. The neck 115 may be formed by recessing inwards from both sides relative to the first engaging portion 114, such that the dimension of the neck 115 in the X direction is smaller than the dimension of the first engaging portion 114 in the X direction. This dimensional difference between the neck 115 and the first engaging portion 11 makes the neck 115 suitable for engagement with the base 13. The base 13 may have a clamping aperture 131 in which the neck 115 of the aforementioned "T"-shaped first clamping body 11 can be clamped; the specific structure of the base 13 will be described below. Furthermore, the bottom surface of the first engaging portion 114 may engage with the outside of the clamping aperture 131 and contact the top surface of the base 13 at the clamping aperture 131 to ensure the stability of the first clamping body. It is understood that the size of the clamping aperture 131 is adapted to the size of the neck 115. Since the first latching portion 114 has a larger size in the X direction, the first latching portion 114 as a whole can be exposed on the top of the base 13 so that the first receiving groove 111 of the first latching portion 114 can hold the box-shaped piece 2.

[0033] Preferably, in some embodiments, such as Figure 2As shown, the first clamp body 11 also includes a second latching portion 116, which is connected to the first latching portion 114 via a neck 115. Similar to the first latching portion 114, the dimension of the second latching portion 116 in the X direction is also larger than the dimension of the neck 115 in the X direction. For example, the dimension of the second latching portion 116 in the X direction can be less than or equal to the dimension of the first latching portion 114 in the X direction. In other words, the first clamp body 11 is integrally constructed to have... Figure 2 The structure shown is basically an "I"-shaped longitudinal cross section. Furthermore, the second snap-fit ​​portion 116 can contact the bottom surface of the base 13, which is opposite to the top surface, forming the clamping hole 131. Thus, the first clamping body 11 contacts the base 13 on both the top and bottom surfaces, thereby further ensuring the stability of the first clamping body 11.

[0034] The following will refer to Figure 4 and Figure 5 To describe the structural embodiment of the second clamping body 12.

[0035] In addition to the second receiving groove 121 described above, the second clamping body 12 may also have a joint 127 connected to the outer bottom surface of the second receiving groove 121. The joint 127 extends from the outer bottom surface of the second receiving groove 121 away from the outer bottom surface in the X direction. Exemplarily, the joint 127 may be constructed as a cylinder. Furthermore, the joint 127 may have a third receiving groove 124 adapted to engage with the torque tester 3, thereby enabling the clamping device according to the embodiments of this application to be adapted to various commonly used types / models of torque testers 3 known in the art. When engaged with the torque tester 3, the third opening 126 of the third receiving groove 124 may receive the end of the torque tester 3, such as the force transmission part of the torque tester 3, and the end of the torque tester 3 shall be in full contact with the inner bottom surface of the third receiving groove 124, thereby ensuring the transmission of force. Exemplarily, the third receiving groove 124 may also be constructed as a rectangle to facilitate full contact with the end of the torque tester 3. Preferably, in some embodiments, to facilitate the quick installation and removal of the torque tester 3 relative to the third receiving groove 124, similar to the first receiving groove 111 and the second receiving groove 121, such as... Figure 5 As shown, the third receiving groove 124 may also have a third gap portion 125, which is located at at least one third corner C3 of the third opening 126 and extends in the depth direction of the third receiving groove 124. Furthermore, the third gap portion 125 may also be formed by a portion of the inner wall of the third receiving groove 124 recessed inward from the third corner C3. Additionally, as... Figure 5 As shown, the cross-section of the second gap 123 can also be an incomplete circle.

[0036] Return now Figure 1 The following will refer to Figure 1 The following describes a structural embodiment of the base 13.

[0037] like Figure 1 As shown, the base 13 may include a body 132, on which the aforementioned clamping opening 131 for the first clamping body 11 is provided. The clamping opening 131 can penetrate through the two lateral sides of the body 132, and the body 132 may have a receiving space S below the clamping opening 131 that communicates with the clamping opening 131. That is, the clamping opening 131 is open at the top, bottom, and both lateral sides. This structure facilitates the installation and removal of the first clamping body 11 relative to the base 13.

[0038] Alternatively, in some embodiments, such as Figure 1 As shown, the main body 132 can be composed of a first vertical segment 133 and a second vertical segment 134. The first vertical segment 133 and the second vertical segment 134 are oriented as a whole to extend in the vertical direction (i.e., parallel to the Y direction), and the first vertical segment 133 and the second vertical segment 134 are configured to form a clamping opening 131 and a receiving space S between them.

[0039] Furthermore, in some embodiments, such as Figure 1 As shown, the first vertical segment 133 may include a first docking portion 133A, a first vertical portion 133B, and a first horizontal structural portion 133C. The first docking portion 133A and the first horizontal structural portion 133C may extend from both ends of the first vertical portion 133B in opposite directions perpendicular to the first vertical portion 133B, that is, the first docking portion 133A and the first horizontal structural portion 133C are parallel to each other, but their extending directions are opposite. The second vertical segment 134 may include a second docking portion 134A, a second vertical portion 134B, and a second horizontal structural portion 134C. The second docking portion 134A and the second horizontal structural portion 134C may extend from both ends of the second vertical portion 134B in the same direction perpendicular to the second vertical portion 134B, that is, the second docking portion 134A and the second horizontal structural portion 134C are parallel to each other, and their extending directions are the same. For example... Figure 1As shown, the bottom surface of the first docking portion 133A and the top surface of the second docking portion 134A can contact each other, thereby realizing the connection between the first vertical split 133 and the second vertical split 134. The size of the second docking portion 134A in the X direction can be configured to be larger than the size of the first docking portion 133A in the X direction, so as to construct a receiving space S. The first horizontal structural portion 133C and the second horizontal structural portion 134C can be arranged parallel to each other, but they do not contact each other, thereby forming a clamping hole 131 between the first horizontal structural portion 133C and the second horizontal structural portion 134C. Furthermore, the first vertical portion 133B and the second vertical portion 134B can be arranged parallel to each other, but they do not contact each other, thereby forming a receiving space S between the first vertical portion 133B, the second vertical portion 134B and the second docking portion 134A. It is understood that the first vertical portion 133B and the second vertical portion 134B extend in the Y direction, and the first horizontal structural portion 133C and the second horizontal structural portion 134C extend in the X direction.

[0040] In some embodiments, the clamping device for testing the torque of a box-shaped component according to this application may be made entirely of metal.

[0041] As described above, the clamping device for torque testing of a box-shaped component according to this application includes a first clamping body, a second clamping body, and a base. The first clamping body is engaged with the top of the base and has a first receiving groove, and the second clamping body has a second receiving groove. By means of the second and second clamping bodies, the two ends of the box-shaped component to be tested can be clamped in the first and second receiving grooves respectively, so as to stably and securely fix the box-shaped component, thereby ensuring the accuracy of the torque test data. Furthermore, the first and second openings of the first and second receiving grooves are each constructed as rectangles adapted to the shape of the box-shaped component, thereby ensuring uniform contact between the box-shaped component and the clamping device. Further, the first and second openings have gaps at their respective corners, thereby facilitating the quick installation and removal of the box-shaped component relative to the first and second receiving grooves. Furthermore, the first clamp has a snap-fit ​​portion, a neck, and a second snap-fit ​​portion. The neck is clamped in the clamping hole of the base, and the snap-fit ​​portion and the second snap-fit ​​portion contact the top and bottom surfaces forming the clamping hole, respectively, thereby further ensuring the secure clamping of the box-shaped component. Additionally, the second clamp also includes a joint portion with a third receiving groove suitable for engagement with a torque tester, thus enabling adaptation to a dedicated torque tester.

[0042] This document has described in detail exemplary embodiments of the clamping device for torque testing of box-shaped components according to the present invention. However, it should be understood that the present invention is not limited to the specific embodiments described and shown above. Various modifications and variations can be made to the present invention by those skilled in the art without departing from its spirit and scope. All such modifications and variations fall within the scope of the present invention. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A clamping device for torque testing of box-shaped parts, characterized in that, The clamping device (1) includes a first clamping body (11), a second clamping body (12), and a base (13). The first clamping body (11) is engaged with the base (13) at the top of the base (13). The first clamping body (11) has a first receiving groove (111), and the second clamping body (12) has a second receiving groove (121). The two ends of the box-shaped piece (2) to be tested are adapted to be received in the first receiving groove (111) and the second receiving groove (121) respectively, so that the box-shaped piece (2) is detachably clamped between the first clamping body (11) and the second clamping body (12).

2. The clamping device according to claim 1, characterized in that, The first opening (112) of the first receiving groove (111) is rectangular, and the first receiving groove (111) has a first gap (113) extending in the depth direction of the first receiving groove (111) at at least one first corner (C1) of the first opening (112); and The second opening (122) of the second receiving groove (121) is configured to be rectangular, and the second receiving groove (121) has a second gap (123) extending in the depth direction of the first receiving groove (111) at at least one second corner (C2) of the second opening (122).

3. The clamping device according to claim 2, characterized in that, The first gap (113) is formed by a portion of the inner wall of the first receiving groove (111) recessed inward from the first corner (C1); and The second gap (123) is formed by a portion of the inner wall of the second receiving groove (121) recessed inward from the second corner (C2).

4. The clamping device according to any one of claims 1 to 3, characterized in that, The base (13) has a clamping opening (131). The first clamping body (11) includes a first snap-fit ​​portion (114) and a neck (115), and the first snap-fit ​​portion (114) is provided with the first receiving groove (111). The neck (115) is configured to be recessed inward from both sides relative to the first snap-fit ​​portion (114) and adapted to be clamped in the clamping hole (131), and the first snap-fit ​​portion (114) contacts the top surface of the base (13) located at the clamping hole (131).

5. The clamping device according to claim 4, characterized in that, The first clamping body (11) further includes a second locking part (116), which is connected to the first locking part (114) via the neck (115), and the second locking part (116) contacts the bottom surface of the base (13) located at the clamping hole (131).

6. The clamping device according to any one of claims 1-3, characterized in that, The second clamping body (12) also has a joint (127) extending from the outer bottom surface of the second receiving groove (121), the joint (127) having a third receiving groove (124) adapted to engage with the torque tester (3).

7. The clamping device according to claim 6, characterized in that, The third opening (126) of the third receiving groove (124) is constructed in a rectangular shape, and the third receiving groove (124) has a third gap (125) extending in the depth direction of the third receiving groove (124) at at least one third corner (C3) of the third opening (126).

8. The clamping device according to claim 4, characterized in that, The base (13) includes a body (132) having the clamping opening (131). The clamping opening (131) extends through the two lateral sides of the body (132), and the body (132) has a receiving space (S) below the clamping opening (131) that communicates with the clamping opening (131) for installing and removing the first clamping body (11).

9. The clamping device according to claim 8, characterized in that, The body (132) is composed of a first vertical segment (133) and a second vertical segment (134), and the first vertical segment (133) and the second vertical segment (134) are configured to form the clamping opening (131) and the receiving space (S) between them.

10. The clamping device according to claim 9, characterized in that, The first vertical segment (133) includes a first docking portion (133A), a first vertical portion (133B) and a first horizontal structural portion (133C) connected to each other, and the second vertical segment (134) includes a second docking portion (134A), a second vertical portion (134B) and a second horizontal structural portion (134C) connected to each other. The bottom surface of the first docking portion (133A) is in contact with the top surface of the second docking portion (134A). The first vertical portion (133B) and the second vertical portion (134B) are arranged parallel to each other and opposite to each other to form the receiving space (S) between them, and The first horizontal structure (133C) and the second horizontal structure (134C) are arranged parallel to each other and opposite to each other to form the clamping aperture (131) between them.

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