Fabricated decoration curtain wall fixing piece for fixing structural beam

Abstract

The invention relates to the technical field of accessories for building curtain wall installation, in particular to an assembly type decoration curtain wall fixing piece for fixing a structural beam. According to the fabricated decoration curtain wall fixing piece for fixing the structural beam, the technical problems that in the prior art, a connecting piece for fixing a curtain wall to a building is unreasonable in design, and a bearing beam or a bearing wall needs to be permanently damaged to be installed are solved. An assembly type decoration curtain wall fixing piece used for fixing a structural beam comprises a first fixing part. The first fixing part and the second fixing part are both fixed on a cross beam; and a locking assembly. And the first fixing part and the second fixing part are fixed on the cross beam in a hanging manner. Hanging connection is a non-intrusive connection method, destructive operation such as drilling in the cross beam is not needed, the fixed part is directly hung at the corresponding position of the cross beam, and preliminary positioning is achieved through cooperation between structures. The locking assembly tightly locks the fixed part on the cross beam through friction force, and it is guaranteed that the fixed part cannot loosen or fall off due to external force.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building curtain wall installation accessories, and particularly relates to a fabricated decoration curtain wall fixing component for fixing a structural beam. BACKGROUND

[0002] A curtain wall is often used as an external decoration surface in a building project, but the curtain wall is often fixed by using a welded keel, which requires a large number of embedded parts. If the embedded parts are not accurately embedded or are missing, holes or perforations often need to be drilled or punched in the wall or beam, causing permanent damage to the structure. In addition, when welding is used, it is easy to cause a fire accident in the building project.

[0003] Therefore, the connecting component for fixing the curtain wall to the building in the prior art has the technical problem of unreasonable design, and permanent damage to the load-bearing beam or load-bearing wall is required for installation. SUMMARY

[0004] The fabricated decoration curtain wall fixing component for fixing a structural beam provided by the present application solves the technical problem of unreasonable design of the connecting component for fixing the curtain wall to the building in the prior art, and permanent damage to the load-bearing beam or load-bearing wall is required for installation.

[0005] Some embodiments for solving the above technical problems include: A fabricated decoration curtain wall fixing component for fixing a structural beam, comprising a first fixing part; a second fixing part, the first fixing part and the second fixing part are both fixed to a cross beam; and a locking assembly, the locking assembly is arranged on the first fixing part and the second fixing part respectively, and the locking assembly is used to lock the first fixing part and the second fixing part to the cross beam respectively; wherein the first fixing part is hung on the cross beam, and the locking assembly arranged on the first fixing part pushes the first fixing part and locks the first fixing part to the cross beam by using friction; the second fixing part is hung on the cross beam, and the locking assembly arranged on the second fixing part pushes the second fixing part and locks the second fixing part to the cross beam by using friction; the first fixing part is fixedly connected with the second fixing part.

[0006] As a preferred, the cross beam comprises a first side wall and a second side wall opposite to the first side wall, the locking assembly arranged on the first fixing part is in contact with the second side wall, and the first fixing part is locked to the cross beam by pushing the first fixing part away from the second side wall.

[0007] As preferred, the first fixing part comprises a first connecting portion hanged on the cross beam and in contact with the first side wall, and a tensioning portion, a first tensioning portion is arranged between the first connecting portion and the tensioning portion, the locking assembly arranged on the first fixing part locks the first fixing part on the cross beam by pushing the first connecting portion against the first side wall through the tensioning portion.

[0008] As preferred, the locking assembly arranged on the second fixing part is in contact with the first side wall and the second side wall respectively, and the locking assembly locks the second fixing part on the cross beam by pushing a portion of the second fixing part away from the first side wall and pushing another portion of the second fixing part away from the second side wall at the same time.

[0009] As preferred, the second fixing part comprises a second connecting portion hanged on the cross beam and in contact with the first side wall, and a third connecting portion hanged on the cross beam and in contact with the second side wall, a second tensioning portion is arranged between the second connecting portion and the third connecting portion, the locking assembly arranged on the second fixing part locks the second fixing part on the cross beam by pushing the second connecting portion away from the first side wall and pushing the third connecting portion away from the second side wall.

[0010] As preferred, the locking assembly comprises a first screw arranged on the tensioning portion, the tensioning portion is provided with a first through hole matched with the first screw, the first screw is provided with a first contact block in contact with the second side wall, and the first screw is further provided with two first nuts, and the tensioning portion is located between the two first nuts.

[0011] As preferred, the tensioning portion is further provided with an extension plate extending along the length direction of the cross beam, and the locking assembly arranged on the first fixing part is multiple and arranged uniformly along the length direction of the extension plate.

[0012] As preferred, the locking assembly further comprises a second screw arranged on the second connecting portion, the second screw is provided with a second contact block in contact with the first side wall, the second connecting portion is provided with a second through hole matched with the second screw, the second screw is provided with two second nuts, and the second connecting portion is located between the two second nuts.

[0013] As a preferred, the locking assembly further comprises a third screw rod arranged on the third connecting part, the third screw rod is provided with a third abutting block, the third abutting block abuts against the second side wall, the third connecting part is provided with a third through hole matched with the third screw rod, the third screw rod is provided with two third nuts, and the third connecting part is located between the two third nuts; The first fixed part is provided with a fourth through hole matched with the third screw rod, and the third screw rod sequentially passes through the third through hole and the fourth through hole, and a part of the first fixed part and the third connecting part are located between the two third nuts.

[0014] As a preferred, the locking assembly further comprises a fourth screw rod, the fourth screw rod comprises a right-handed thread segment and a left-handed thread segment, the right-handed thread segment and the left-handed thread segment are opposite in screw rotation direction, the first connecting part is provided with a right-handed thread cylinder matched with the right-handed thread segment, the right-handed thread cylinder and the first connecting part are in an integral structure, the second connecting part is provided with a left-handed thread cylinder matched with the left-handed thread segment, the left-handed thread cylinder and the second connecting part are in an integral structure, the right-handed thread segment is arranged on the left-handed thread segment through an operation segment, the right-handed thread segment and the left-handed thread segment are in an integral structure with the operation segment, the right-handed thread segment and the left-handed thread segment are coaxially arranged, the operation segment has an inscribed circle axis coaxial with the right-handed thread segment, and the operation segment has a polygonal cross-sectional shape.

[0015] Compared with the prior art, the present application has the following advantages: The first fixed part and the second fixed part are both fixed to the cross beam in a hanging manner. Hanging is a non-invasive connection method that does not require destructive operations such as drilling holes in the cross beam. The fixed parts are directly hung on the corresponding positions of the cross beam, and the preliminary positioning is achieved by the cooperation between the structures.

[0016] The first fixed part and the second fixed part are both provided with a locking assembly. When the locking assembly works, it pushes the corresponding fixed part, so that the first fixed part and the second fixed part generate sufficient friction with the cross beam. This friction tightly locks the fixed parts on the cross beam, ensuring that the fixed parts will not loosen or fall off due to external forces such as wind force and curtain wall self-weight.

[0017] The locking assembly is arranged on the first fixed part and the second fixed part respectively. Its main function is to provide locking force for the fixed parts and to stabilize the fixed parts on the cross beam by generating friction. The first fixed part and the second fixed part are fixedly connected to form a whole fixed structure. This connection method can enhance the stability and carrying capacity of the whole fixed part, so that the curtain wall is more stably fixed on the building.

[0018] Because of the way of hanging and friction locking, there is no need to drill holes on the load-bearing beam or load-bearing wall, which avoids permanent damage to the structure caused by drilling holes, ensuring the structural integrity and safety of the building.

[0019] ‌The assembly type design makes the installation of fixed parts more convenient and fast, and the hanging and locking operation is relatively easier to control than traditional methods such as welding, reducing errors in the installation process and improving the accuracy of installation. At the same time, there is no need for complex embedded part embedding and welding operation, which shortens the construction period. Since welding operation is avoided, the risk of fire accidents caused by welding is fundamentally eliminated, improving the safety during the construction process of building engineering.

[0020] ‌This assembly type fixed part can be designed and adjusted according to the requirements of beams and curtain walls of different shapes and sizes, with strong adaptability and versatility, which can meet the needs of various construction projects. BRIEF DESCRIPTION OF DRAWINGS

[0021] For the purpose of explanation, several embodiments of the present technology are set forth in the following drawings. The following drawings are incorporated into this text and form part of the specific embodiments. In some cases, well-known structures and components are shown in block diagram form in order to avoid obscuring the concepts of the subject technology.

[0022] Figure 1 The first angle diagram of the present application installed on the beam.

[0023] Figure 2 The second angle diagram of the present application installed on the beam.

[0024] Figure 3 The front view of the present application installed on the beam.

[0025] Figure 4 The diagram of the first fixed part.

[0026] Figure 5 The diagram of the second fixed part.

[0027] Figure 6 The diagram of the first screw rod.

[0028] Figure 7 The diagram of the first fixed part provided with an extension plate in the present application.

[0029] In the figure: 1, the first fixed part, 11, the first connecting part, 12, the tensioning part, 13, the first tensioning part, 14, the mounting part, 15, the extension plate.

[0030] 2, the second fixed part, 21, the second connecting part, 22, the third connecting part, 23, the second tensioning part.

[0031] 3. Locking assembly; 31. First screw; 32. First abutment block; 33. First nut; 34. Fourth screw; 35. Positive thread section; 36. Negative thread section; 37. Operating section; 38. Positive thread cylinder; 39. Negative thread cylinder.

[0032] 100. Horizontal beam; 101. First side wall; 102. Second side wall. Detailed Implementation

[0033] The specific embodiments shown below are intended to describe various configurations of the subject matter of the invention and are not intended to represent the only configuration in which the subject matter of the invention can be practiced. The specific embodiments include particular details intended to provide a thorough understanding of the subject matter of the invention. However, it will be clear and apparent to those skilled in the art that the subject matter of the invention is not limited to the specific details shown herein and can be practiced without these specific details.

[0034] Reference Figures 1 to 7 As shown, a prefabricated decorative curtain wall fastener for fixing structural beams includes a first fixing part 1; The second fixing part 2, both the first fixing part 1 and the second fixing part 2 are fixed to the crossbeam 100; The locking component 3 is respectively disposed on the first fixing part 1 and the second fixing part 2, and the locking component 3 is used to lock the first fixing part 1 and the second fixing part 2 to the crossbeam 100 respectively; Wherein, the first fixing part 1 is attached to the crossbeam 100, and the locking component 3 provided on the first fixing part 1 pushes the first fixing part 1 and uses friction to lock the first fixing part 1 to the crossbeam 100; The second fixing part 2 is attached to the crossbeam 100, and the locking component 3 provided on the second fixing part 2 pushes the second fixing part 2 and locks the second fixing part 2 to the crossbeam 100 by friction. The first fixing part 1 is fixedly connected to the second fixing part 2.

[0035] Understandably, both the first fixing part 1 and the second fixing part 2 are U-shaped. For example, the first fixing part 1 can be a U-shaped opening facing downwards, and during installation, the first fixing part 1 is inserted into the crossbeam 100 from top to bottom.

[0036] The second fixing part 2 can be a U-shape with the opening facing upwards. During installation, the second fixing part 2 is inserted into the crossbeam 100 from bottom to top.

[0037] ReferenceFigures 1 to 6 As shown, after the first fixing part 1 and the second fixing part 2 are installed on the crossbeam 100, they are then locked onto the crossbeam 100 by the locking assembly 3. The locking assembly 3 uses friction to lock the first fixing part 1 and the second fixing part 2 onto the crossbeam 100 respectively, completing the fixing operation without damaging the crossbeam 100.

[0038] After the first fixing part 1 and the second fixing part 2 are both locked onto the crossbeam 100, the curtain wall is then fixed to the first fixing part 1 or the second fixing part 2.

[0039] In some embodiments, both the first fixing part 1 and the second fixing part 2 can be made of angle steel. For example, they can be formed by bending angle steel. Alternatively, they can be formed by welding angle steel.

[0040] In some embodiments, the first fixing part 1 and the second fixing part 2 may also be made of I-beams or other types of steel.

[0041] Reference Figures 1 to 6 As shown, in some embodiments, since the first fixing part 1 is installed on the crossbeam 100 from top to bottom, the curtain wall can be installed on the first part. The force exerted by the curtain wall on the first fixing part 1 is downward. Therefore, when the curtain wall is installed on the first fixing part 1, the curtain wall and the first fixing part 1 are not easy to fall off the crossbeam 100.

[0042] In some embodiments, the crossbeam 100 includes a first sidewall 101 and a second sidewall 102 opposite to the first sidewall 101. The locking assembly 3 disposed on the first fixing portion 1 abuts against the second sidewall 102, and the first fixing portion 1 is pushed away from the second sidewall 102 to lock the first fixing portion 1 to the crossbeam 100.

[0043] Reference Figures 1 to 6 As shown, in some embodiments, the first fixing part 1 includes a first connecting part 11 that is attached to the crossbeam 100 and contacts the first side wall 101. The first fixing part 1 also includes a tensioning part 12. A first tensioning part 13 is provided between the first connecting part 11 and the tensioning part 12. The locking assembly 3 provided in the first fixing part pushes the tensioning part 12 to make the first connecting part 11 press against the first side wall 101.

[0044] Understandably, the tensioning part 12 is pushed by the locking assembly 3, causing the entire first fixing part 1 to exert a force on the crossbeam 100, the direction of which is from the first side wall 101 toward the second side wall 102. That is, this force causes the first connecting part 11 to be tightly pressed against the first side wall 101, and the first fixing part 1 is fixed to the crossbeam 100 by friction.

[0045] In some embodiments, a mounting portion 14 for mounting the curtain wall may also be provided on the tensioning portion 12. The mounting portion 14 and the tensioning portion 12 are integrally formed. Alternatively, the mounting portion 14 may be welded to the tensioning portion 12.

[0046] For example, the mounting section can be made of angle steel or I-beams.

[0047] In some embodiments, the mounting portion 14 may be curved, or it may be straight. For example, the mounting portion 14 may be bent into a frame shape to facilitate the installation of the curtain wall.

[0048] Reference Figures 1 to 6 As shown, in some embodiments, the locking assembly 3 disposed on the second fixing part 2 abuts against the first side wall 101 and the second side wall 102 respectively, and pushes a part of the second fixing part 2 away from the first side wall 101 and pushes another part of the second fixing part 2 away from the second side wall 102 to lock the second fixing part 2 to the crossbeam 100.

[0049] In some embodiments, the second fixing part 2 includes a second connecting part 21 that is attached to the crossbeam 100 and contacts the first side wall 101, and a third connecting part 22 that is attached to the crossbeam 100 and contacts the second side wall 102. A second tensioning part 23 is provided between the second connecting part 21 and the third connecting part 22. The locking assembly 3 provided on the second fixing part 2 locks the second fixing part 2 to the crossbeam 100 by pushing the second connecting part 21 away from the first side wall 101 and the third connecting part 22 away from the second side wall 102.

[0050] In some embodiments, the locking assembly 3 includes a first screw 31 disposed on the tensioning portion 12, the tensioning portion 12 having a first through hole that engages with the first screw 31, the first screw 31 having a first abutment block 32 that contacts the second sidewall 102, the first screw 31 also having a first nut 33, there being two first nuts 33, and the tensioning portion 12 being located between the two first nuts 33.

[0051] In some embodiments, the first contact block 32 and the first screw 31 are an integral structure.

[0052] In some embodiments, the first abutment block 32 may have a larger area; for example, the diameter of the inscribed circle of the first abutment block 32 may be 3 to 5 times that of the screw.

[0053] Reference Figure 7As shown, in some embodiments, the tensioning part 12 is further provided with an extension plate 15, which extends along the length direction of the crossbeam 100. There are multiple locking components 3 provided on the first fixing part 1, and they are evenly arranged along the length direction of the extension plate 15.

[0054] The extension plate 15 can be integrated with the tensioning part 12.

[0055] Understandably, the more first screws 31 there are, the more first contact blocks 32 there are, the larger the contact area between the first contact blocks 32 and the crossbeam 100, and the more uniform the force on the first fixed part 1 and the crossbeam 100.

[0056] In some embodiments, the first connecting portion 11 may also be provided with a corresponding plate to increase the contact area between the first connecting portion 11 and the crossbeam 100.

[0057] In some embodiments, the locking assembly 3 further includes a second screw disposed on the second connecting portion 21, the second screw being provided with a second abutting block, the second abutting block abutting against the first sidewall 101, the second connecting portion 21 being provided with a second through hole cooperating with the second screw, the second screw being provided with a second nut, there are two second nuts, and the second connecting portion 21 is located between the two second nuts.

[0058] In some embodiments, the locking assembly 3 further includes a third screw disposed on the third connecting portion 22, the third screw being provided with a third abutting block, the third abutting block abutting against the second sidewall 102, the third connecting portion 22 being provided with a third through hole cooperating with the third screw, the third screw being provided with a third nut, there are two third nuts, and the third connecting portion 22 is located between the two third nuts.

[0059] In some embodiments, a fourth through hole may be provided on the mounting portion 14. The first fixing portion 1 is provided with a fourth through hole, which engages with the third screw. The third screw passes through the third through hole and the fourth through hole in sequence. A portion of the first fixing portion 1 and the third connecting portion 22 are both located between the two third nuts.

[0060] In some embodiments, the structures of the second screw and the third screw are the same as those of the first screw 31.

[0061] Understandably, since the second fixing part 2 is used to improve the connection strength between the first fixing part 1 and the crossbeam 100, and the second part does not bear or only bears a small force, the number of locking components 3 provided on the second fixing part 2 is not limited. Of course, corresponding plates can also be provided on the second part to increase the number of second and third screws.

[0062] Reference Figure 7 As shown, in some embodiments, the locking assembly 3 further includes a fourth screw 34, which includes a positive thread section 35 and a negative thread section 36. The positive thread section 35 and the negative thread section 36 have opposite thread directions. The first connecting part 11 is provided with a positive threaded cylinder 38 that mates with the positive thread section 35. The positive threaded cylinder 38 and the first connecting part 11 are integrally formed. The second connecting part 21 is provided with a negative threaded cylinder 39 that mates with the negative thread section 36. The negative threaded cylinder 39 and the second connecting part 21 are integrally formed. The positive thread section 35 is disposed on the negative thread section 36 through an operating section 37. Both the positive thread section 35 and the negative thread section 36 are integrally formed with the operating section 37. Furthermore, the positive thread section 35 and the negative thread section 36 are coaxially arranged. The inner circular axis of the operating section 37 is coaxial with the positive thread section 35. The cross-sectional shape of the operating section 37 is polygonal.

[0063] In some embodiments, the arrangement of the fourth screw 34 and the lower threaded cylinder and the reverse threaded cylinder 39 further improves the connection strength between the first fixed part 1 and the second fixed part 2, so that the first fixed part 1, the second fixed part 2 and the crossbeam 100 have a higher connection strength.

[0064] The technical solution of the present invention and its corresponding details have been described above. It is understood that the above description is only some implementation schemes of the technical solution of the present invention, and some details may be omitted in the specific implementation.

[0065] Furthermore, in some embodiments of the above invention, multiple embodiments may be combined; however, due to space limitations, all such combinations will not be listed here. Those skilled in the art can freely combine and implement the above embodiments according to their needs to obtain a better application experience.

[0066] When implementing the subject matter of this invention, those skilled in the art can obtain other detailed configurations or drawings based on the subject matter and drawings. Obviously, these details are still within the scope of the subject matter of this invention without departing from it.

Claims

1. A prefabricated decorative curtain wall fastener for fixing structural beams, characterized in that: The system includes a first fixing part (1); a second fixing part (2), both of which are fixed to a crossbeam (100); and a locking assembly (3), which is respectively disposed on the first fixing part (1) and the second fixing part (2), and is used to lock the first fixing part (1) and the second fixing part (2) to the crossbeam (100); wherein the first fixing part (1) is attached to the crossbeam (100), and is provided with The locking assembly (3) of the first fixing part (1) pushes the first fixing part (1) and locks the first fixing part (1) to the crossbeam (100) by friction; the second fixing part (2) is attached to the crossbeam (100), and the locking assembly (3) provided on the second fixing part (2) pushes the second fixing part (2) and locks the second fixing part (2) to the crossbeam (100) by friction; the first fixing part (1) and the second fixing part (2) are fixedly connected.

2. The prefabricated decorative curtain wall fastener for fixing structural beams according to claim 1, characterized in that: The crossbeam (100) includes a first sidewall (101) and a second sidewall (102) opposite to the first sidewall (101). The locking assembly (3) disposed on the first fixing part (1) abuts against the second sidewall (102), and pushes the first fixing part (1) away from the second sidewall (102) to lock the first fixing part (1) to the crossbeam (100).

3. The prefabricated decorative curtain wall fastener for fixing structural beams according to claim 2, characterized in that: The first fixing part (1) includes a first connecting part (11) that is attached to the crossbeam (100) and contacts the first side wall (101). The first fixing part (1) also includes a tensioning part (12). A first tensioning part (13) is provided between the first connecting part (11) and the tensioning part (12). The locking assembly (3) provided in the first fixing part pushes the tensioning part (12) to make the first connecting part (11) abut against the first side wall (101).

4. The prefabricated decorative curtain wall fastener for fixing structural beams according to claim 3, characterized in that: The locking assembly (3) disposed on the second fixing part (2) abuts against the first side wall (101) and the second side wall (102) respectively, and pushes a part of the second fixing part (2) away from the first side wall (101) and pushes another part of the second fixing part (2) away from the second side wall (102) to lock the second fixing part (2) to the crossbeam (100).

5. The prefabricated decorative curtain wall fastener for fixing structural beams according to claim 4, characterized in that: The second fixing part (2) includes a second connecting part (21) that is attached to the crossbeam (100) and contacts the first side wall (101) and a third connecting part (22) that is attached to the crossbeam (100) and contacts the second side wall (102). A second tensioning part (23) is provided between the second connecting part (21) and the third connecting part (22). The locking assembly (3) provided in the second fixing part (2) locks the second fixing part (2) to the crossbeam (100) by pushing the second connecting part (21) away from the first side wall (101) and the third connecting part (22) away from the second side wall (102).

6. The prefabricated decorative curtain wall fastener for fixing structural beams according to claim 5, characterized in that: The locking assembly (3) includes a first screw (31) disposed on the tensioning part (12). The tensioning part (12) is provided with a first through hole that cooperates with the first screw (31). The first screw (31) is provided with a first abutting block (32). The first abutting block (32) contacts the second side wall (102). The first screw (31) is also provided with a first nut (33). There are two first nuts (33). The tensioning part (12) is located between the two first nuts (33).

7. The prefabricated decorative curtain wall fastener for fixing structural beams according to claim 6, characterized in that: The tensioning part (12) is also provided with an extension plate (15), which extends along the length direction of the crossbeam (100). There are multiple locking components (3) provided in the first fixing part (1), which are evenly arranged along the length direction of the extension plate (15).

8. The prefabricated decorative curtain wall fastener for fixing structural beams according to claim 5, characterized in that: The locking assembly (3) further includes a second screw disposed on the second connecting part (21). The second screw is provided with a second abutting block, which abuts against the first side wall (101). The second connecting part (21) is provided with a second through hole that cooperates with the second screw. The second screw is provided with a second nut, and there are two second nuts. The second connecting part (21) is located between the two second nuts.

9. The prefabricated decorative curtain wall fastener for fixing structural beams according to claim 8, characterized in that: The locking assembly (3) further includes a third screw disposed on the third connecting part (22), the third screw being provided with a third abutting block, the third abutting block abutting against the second side wall (102), the third connecting part (22) being provided with a third through hole cooperating with the third screw, the third screw being provided with a third nut, there are two third nuts, the third connecting part (22) being located between the two third nuts; the first fixing part (1) being provided with a fourth through hole, the fourth through hole cooperating with the third screw, the third screw passing through the third through hole and the fourth through hole in sequence, a part of the first fixing part (1) and the third connecting part (22) being located between the two third nuts.

10. The prefabricated decorative curtain wall fastener for fixing structural beams according to claim 9, characterized in that: The locking assembly (3) further includes a fourth screw (34), which includes a positive thread section (35) and a negative thread section (36). The positive thread section (35) and the negative thread section (36) have opposite thread directions. The first connecting part (11) is provided with a positive threaded cylinder (38) that mates with the positive thread section (35). The positive threaded cylinder (38) and the first connecting part (11) are integrally formed. The second connecting part (21) is provided with a negative threaded cylinder (39) that mates with the negative thread section (36). The reverse threaded cylinder (39) and the second connecting part (21) are integral structures. The positive threaded section (35) is set on the reverse threaded section (36) through the operating section (37). The positive threaded section (35) and the reverse threaded section (36) are integral structures with the operating section (37). Furthermore, the positive threaded section (35) and the reverse threaded section (36) are coaxially arranged. The inner circle axis of the operating section (37) is coaxial with the positive threaded section (35). The cross-sectional shape of the operating section (37) is polygonal.

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