LIGHTWEIGHT CONNECTOR WITH A SPECIALLY SHAPED HEAD

Abstract

The invention relates to a connecting element (1) with a head (10). Accordingly, its novelty is that it contains at least two contact zones (11) having at least one disassembly contact surface (112) and one clamping contact surface (111) which enables the transmission of torque from the drive apparatus (40), and between the contact zones (11) there is a first curve (12), a second curve (13), a third curve (14) and a fourth curve (15) respectively, the first curve (12) and the second curve (13) have the same radius value, the third curve (14) and the fourth curve (15) have the same radius value. Figure 1

Description

1 TARIFF LIGHTWEIGHT CONNECTOR WITH A SPECIALLY SHAPED HEAD TECHNICAL AREA 5 The invention describes a lightweight coupling element that can be mounted with standard drive devices. It is related to. PREVIOUS TECHNIQUE 10 Fasteners are mechanical components used to hold different parts together. Widely used in many industrial sectors, particularly in the automotive and construction industries. They are used. The connecting element is necessary for tightening during the assembly of the parts. The appropriate kit, socket, or external or internal key parts located in the head shape can be selected. Axial rotation is achieved by applying torque with the help of special drive devices. This is being carried out. The contact of the crimping devices used for the external and internal key forms. Opening, tightening and loosening operations resulting from tolerances between surfaces 20 compared to the main contact area of ​​torque transmission during axial rotation, the contact This causes it to occur through smaller areas on their surfaces. Non-contacting areas on the surfaces have no other functionality and are not for squeezing. and remains idle under relaxation conditions. 25 located in these aforementioned regions. the material causes the fastener to weigh more than necessary In the area where it is used, an additional weight increase occurs due to the fastening element. The fastener... In weight reduction efforts in components, it is often the non-functional parts that are targeted. New designs are created by extracting and connecting the discarded material. Studies are being conducted to derive the element from the head shape. This situation is design 30 It has limitations in this regard, with a weight reduction rate of around 25%. It restricts. In weight reduction studies, the head shape changes due to the torque applied by the clamping device. Damage that causes it to deform and lose its original geometry, head shape 35 It is also possible for situations to occur where its rigidity and strength are lost. In addition, In special design studies conducted for the use of special drive apparatus, in the form of a head 2 Although the weight gain rates achieved are increased, the tightening and loosening operations are only Because this can only be done with the aforementioned special drive apparatus, the supply processes are prolonged, and Additional costs arise. That is, the weight that can be driven with standard clamping devices. Weight can be reduced with reduced fasteners and special drive devices. Even suitable fasteners can lead to different problems. 5 PCT application number WO8302983 concerns externally curved, clamping and loosening surfaces. the regions where they meet are on a circle concentric with the axis of the connecting element Head forms are available for fasteners based on the principle of being. The invention refers to... In the forms, the interior angle between two adjacent surfaces applying rotational force is alternately 10° as being smaller and larger than 180°, so that the connection points between them It proposes designs that alternately lie on an outer and an inner tangential circle. These fasteners require the use of special clamps with the same geometry as the head shape. It requires. Additionally, in the assembly conditions of the fasteners, for the purpose of tightening and loosening. Axial rotational forces generated depending on the applied torque, insufficient wrench Local plastic deformation in the parts in contact with the drive apparatus as a result of contact surfaces. A stripping problem is encountered, which causes the problem. The occurrence of a stripping problem... In this case, the axial rotation required to tighten and loosen the fastener is 20°. The force cannot be transmitted to the fastener by the drive device, and the desired locking mechanism cannot be established. The load cannot be supplied. Consequently, the assembly process cannot be carried out as required. It cannot be delivered. In the known state of the technique, to avoid the problem of stripping, the head shape is usually 25 for the fastener, providing the same form but a higher percentage of key contact surface. specialized drive devices are used, or as another solution, sufficient switches are available. The head height is increased to provide more contact area. However, this also requires extra space. This leads to increased material usage. In weight reduction efforts, the inward shaping of the central part of the head is often emphasized. correctly, in familiar shapes such as cylindrical, spherical, or fastener head The outer edges of the form are hollowed out inwards while maintaining a certain wall thickness. Weight reduction is achieved through this process. Additionally, the interior is designed in the shape of a head. Performing the tightening and loosening operation of the key parts and the fastener and 35 Although weight reduction has been achieved in the head shape, the dimensions of the wrenches to be used and 3 The weight reduction achieved due to tolerance ranges is at a lower level. It remains. In conclusion, all the problems mentioned above necessitate an innovation in the relevant technical field. It has made it mandatory. 5 A BRIEF DESCRIPTION OF THE INVENTION The present invention aims to eliminate the aforementioned disadvantages and contribute to the relevant technical field. It involves a reduced-weight fastener designed to offer new advantages. 10 One aim of the invention is to achieve the desired torque and / or locking load during assembly. where the stripping problem is not experienced to the extent desired for an effective connection. a fastening element that makes it possible to achieve connections that can be locked to reveal. 15 Another purpose of the invention is to provide a special actuator for tightening and loosening operations in assembly conditions. can be used with traditional hexagonal head borers without the need for an adapter. The goal is to introduce a connecting element. Another aim of the invention is to address one of today's industrial trends: lightweight and high-performance. traditional fasteners that serve the use of high-strength fasteners The goal is to create a fastening element with a unique head shape that differentiates it from other components. Another aim of the invention is to eliminate the clamping 25 that negatively affects assembly performance. and the wrench acted upon by the axial rotational force generated by the application of the removal torque. A solution to the stripping problem that occurs when contact areas are insufficient. The aim is to provide sufficient key contact areas without experiencing stripping problems, using traditional methods. via fewer contact points compared to fasteners with a hexagonal head. A connecting element that provides this has been introduced. 30 Another objective of the invention is to connect the contact areas with concave arcs. Thanks to this, the weight of the material in the shape of the head can be significantly reduced. The goal is to introduce a reduced number of connecting elements. 35 Another purpose of the invention is to protect the head-shaped material during tightening and loosening. key form geometry resulting from deformation caused by reduction 4 It prevents the head shape from being damaged in a way that would cause it to lose its shape. Thus, the head The form is rigid, and the relief is made in the center of the head, which is a conventional relief. In contrast to their forms, the characteristic main boundaries of the head form are taken as a reference. This has been accomplished. Accordingly, in the form of a head containing a rectangular cavity, much more A connecting element that achieves high weight savings is presented. 5 Another purpose of the invention is to improve the shaping production applied within the scope of the cold forging process. The goal is to create a fastening element that conforms to these methods. All the objectives mentioned above and those that will emerge from the detailed explanation below are 10 The present invention relates to a fastening element with a head. According to the innovation, it features a detachable contact surface that enables torque transmission from the drive apparatus and It must contain at least two contact zones, at least one of which has a squeezing contact surface. between the regions, respectively, a first curve, a second curve, a third curve, and a the inclusion of a fourth curve, the first and second curves having the same radius value, 15 The third and fourth curves must have the same radius value. Thus, the connection... The strength of the element and the head shape are such that it does not require special drive apparatus. While maintaining these standards, significant weight reduction and cost can be achieved. A characteristic feature of a possible design of the invention is that the number of contact areas is four. 20 This ensures optimal contact for torque transmission, providing a connection without compromising strength. The weight of the element is reduced. A feature of a possible configuration of the invention is that each contact area transmits torque. This is made possible by the fact that it includes a disassembly contact surface and a clamping contact surface. 25 A characteristic feature of a possible construction of the invention is the radius of the first curve and the radius of the second curve. its value is greater than the radius values ​​of the third and fourth curves. A characteristic feature of a possible configuration of the invention is that, after the drive apparatus is attached to the head, 30 between the first, second, third, and fourth curves and the drive apparatus. at least one unloading resulting from the removal of material from the remaining section This involves removing unnecessary material, thereby lightening the fastener. is provided. 35 A characteristic feature of a possible design of the invention is that the area between the contact regions must be at least It contains a cavity. Thus, the weight can be increased without reducing the strength of the head. This has been reduced. The characteristic of a possible construction of the invention is that the first curve, the second curve, the third curve 5 and at least one of the fourth curves must be a concave arc. Thus, the strength remains unchanged. Space can be created and weight reduced. Also, the amount of material used is decreased. As prices decrease, costs also decrease. A characteristic feature of a possible configuration of the invention is that it includes at least one flange. Thus, in assembly, 10 The strength of the connection is increased by preventing slipping and loosening. A feature of a possible configuration of the invention is that the flange connects the first curve with the second curve. The contact areas it connects are respectively a linear transition surface and a curved transition surface. a surface and a second linear transition surface; 15 where the third curve and the fourth curve meet. It contains a linear transition surface between the contact regions. Thus, the strength Weight can be reduced by removing material from the flange while maintaining its shape. A characteristic feature of a possible design of the invention is that the connecting element is a bolt and a shaft. It should include and have a shaft with helical teeth, preferably running along its outer surface. 20 Thus, assembly can be accomplished using female fasteners. A characteristic feature of the possible construction of the invention is that the cavity is rectangular in shape. Thus A symmetrical form is obtained, and as a result, production is carried out by cold forming. It is becoming easier and also, without loss of strength, the weight is significantly reduced by 25. It can be reduced. A feature of a possible design of the invention is that the fastening element is a nut and the groove a hole with a circular cross-section and helical teeth extending preferably along the inner surface of the hole It has the ability to be mounted onto male connectors. 30 BRIEF DESCRIPTION OF THE FIGURES Figures 1-2 show isometric views of the fastener element, the subject of the invention, from various angles. It has been given. 35 6 Figures 3-6 show the isometric views of the flanged version of the connector, which is the subject of the invention, from various angles. Their appearances are given. Figure 7 shows a top view of the flanged version of the connector that is the subject of the invention. Figure 8 shows the side and cross-section views of the flanged version of the connector element that is the subject of the invention. It has been given. Figure 9 shows the isometric view of the connecting element and a standard hexagonal drive apparatus that are the subject of the invention. The appearance is given. 10 Figure 10 shows a side section of the head of the connecting element that is the subject of the invention, through which the drive device passes. An image has been provided. Figure 11 shows the connection between the connecting element and the drive apparatus, which is the subject of the invention. a top in which the torque applied in the tightening direction is transmitted by contacting the tightening contact surfaces. A cross-sectional view is provided. Figure 12 shows the connection between the connecting element and the actuator, which is the subject of the invention. In a 20-degree procedure, the torque applied in the removal direction is transmitted by contacting the removal contact surfaces. A topographic view is provided. Figures 13 and 14 show the structure in which the fastening element of the invention is a nut. Isometric views are provided. Figures 15 and 16 show that the fastener in question is a nut containing a flange. The appearance is given. Figure 17 shows the upper part of the structure where the connecting element that is the subject of the invention is a flanged nut. The appearance is given. 30 Figures 18-19 show an alternative flange configuration of the connecting element that is the subject of the invention. Isometric views are provided. Figure 20 shows the top view of the alternative flange configuration of the connector element that is the subject of the invention. 35 It has been given. 7 DETAILED DESCRIPTION OF THE INVENTION In this detailed description, the subject of the invention, the fastener (1), is only to better explain the subject. It is explained with examples that do not create any limiting effect on understanding. Figures 1-6 show the representative isometric views of the connecting element (1) that is the subject of the invention. The present invention overcomes the aforementioned disadvantages in the prior art. Lightweight and high-strength connectors, which overcome challenges and are one of the industrial trends. The new head (10) form has been developed as an alternative to the elements (1). The generation is related to a connecting element (1). Connecting element (1) has 10 heads (10) in question. It can be a male or female connector. The connecting element (1) contains at least one groove (17) on the head (10). The groove (17) is the contact It is in the form of a quadrilateral between regions (11). The cavity in the form of a quadrilateral is shown in Figure 7. The visible top and bottom corners, that is, the intersection points of the top and bottom edges, 15 It is located on the central axis (M). In the preferred configuration, the cavity (17) Only one pair of opposite sides are equal to each other. However, in the alternative construction, all of them... It can also be a rhombus with opposite sides of equal length. In this case, the hollow (17) is based on the central axis (M) passing through the center of the head (10), as can be seen in Figure 7. It has become symmetrical. The cavity (17) is essentially a 20 with a certain depth on the head (10). It is a gap. Thanks to the gap (17), the head forms of traditional hexagonal connecting elements The weight has been significantly reduced according to their weight. The hollow (17) has a radius at its corners. It may involve transitions. If the fastener is a male fastener, preferably a bolt, the slot is 25. (17), in the form of a quadrilateral on the head as described above, extending towards the flange (20). It is a channel with a specific depth. This structure is shown in the cross-sectional view in Figure 8. It is shown that in this case the connecting element (1) also contains at least one shaft (30). Shaft (30) has a helical gear running along its entire outer surface. If the connecting element (1) is a female connecting element, preferably a nut, then The recess (17) is a hole passing through the center of the connecting element (1). In other words As can be seen in Figures 13 and 14, it is a circular hole with open ends. The wall thickness of the hole is determined in a way that does not compromise mechanical performance. In addition, the hole makes it possible to connect male fasteners such as bolts to the nut. 35 It is preferably internally threaded so that it will work. 8 The connecting element (1) has at least one flange (20) as can be seen in Figure 3 and Figure 18. It may contain. The flange (20) is located under the head (10) and the flange (20) The circumference of the head (10) is similar to traditional hexagonal flanged fittings (1). It has a larger diameter than its form. In addition, the head with respect to the aforementioned flange (20) The flange angle in the region above (10) is between 3° and 10°. Preferably the flange angle is between 5° and 7° 5 It is between them. In addition, the flange angle in the area on the flange (20) and the head (10) is conventional six. The flange aspect of the angled flanged connection elements (1) is lower. This allows for cold In order to facilitate production in the shaping process, the height of the head (10) The optimum flange angle (20) value was obtained for easy adjustment. The head (10) enables a drive apparatus (40) to apply force to the connecting element (1) of a drive apparatus (40). It contains at least two contact zones (11). In the preferred configuration, the contact zone (11) there are four. Contact areas (11) from the axial rotation force formed. It is designed so that it will not be deformed. Drive apparatus (40), contact By applying rotational force from the (11) regions to the head (10) part, the connecting element (1) 15 It enables rotation in the tightening direction (I) or the loosening direction (II). Drive device (40) can be a standard key. The contact areas (11) are subjected to the torque applied in the tightening direction (I) via the drive apparatus (40). 20 the drive apparatus (40) used, namely the substandard corner boring machine, which contacts the surfaces It contains at least one squeezing contact surface (111). In the preferred configuration, the squeezing contact There are four surfaces (111) located in each contact region (11). The dimensional dimensions of the clamping contact surfaces (111) are in accordance with the main standard for fasteners, 25 “ISO 898-1 - Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch The highest fastener strength class defined within the "thread" category is 12.9. corresponding to the strength values ​​and “ISO 898-7 - Mechanical properties of fasteners Part 7: Torsional testing and minimum torques for bolts and screws with nominal 30 Minimum fracture torques given within the scope of the "diameters 1 mm to 10 mm" standard. It is determined according to the sufficient key contact areas that will provide. The most important factors affecting the performance of fasteners under assembly conditions (1) To reach the locking load, which is one of the parameters, 35 is applied during the tightening process. The magnitude of the axial rotational force generated in the contact regions with the torque (11) is important. The contact areas (11) located in the head (10) during tightening the connecting element (1) 9 Axial shift occurring at the highest torque values ​​that causes it to lose functionality Even when rotational force is applied, there is no abrasion in the aforementioned contact areas (11). It is optimized to provide durability. The axial torque created by the torque applied in the disassembly direction (II) in the contact area (11) is 5 Standard used to ensure that the rotational force is transmitted to the connecting element (1). At least one disassembly contact surface in contact with the surfaces of the hexagonal boring machine (112) The disassembly contact surface (112) is located in each contact area (11). There are four of them. The connecting element (1) contains at least one drain (16) on the head (10). Drain (16), when looking at the cross-section view of the head (10) taken from above as in Figures 11 and 12, with the wrench (10) on the head so as not to affect the assembly performance of the fastener (1). These are the parts where material is reduced in the non-contact areas. These discharges (16) are two contact areas. The gaps between region (11) are bounded by concave springs and the drive apparatus 15 is happening. The height of the discharges (16) is the height of the connecting element (1) in the present invention. It has the same height as the wrench holding height. In other words, for tightening and loosening. The contact surfaces (112) are at the same height. The mentioned discharge (16) is shown in Figures 11 and 12. As can be seen, after the drive apparatus (40) is attached to the head (10), the drive is connected to the head (10). It is formed between the apparatus (40). To make it more understandable, the gap (16), connection causing the rigidity and strength of the form of the element (1) head (10) to be lost It is created by reducing the material in such a way that it will not be possible and the connecting element (1) head (10) It helps to reduce its weight. 25 As a result of the discharge (16) created, the head (10) has a first curve (12), a second curve (13), a It includes a third curve (14) and a fourth curve (15). So there are four contact zones. (11) the first arc (12), the second arc (13), the third arc (14) which are mentioned in turn and are connected by the fourth curve (15). Therefore, the mentioned curves 30 (The curves mentioned are the first curve (12), the second curve (13), the third curve (14) and The fourth curve (15) is located between the two contact zones (11). The curves mentioned are in the form of concave arcs and have a radius value. Four Since there are four curves, there are four drainage holes (16). The curve is concave. This means that the head (10) curves inwards towards the center. 35 As a result, the contact areas (11) are not a straight line as in the current technique, but curves. They are connected to each other. In order to reduce the use of material in the head (10). In order to create the mentioned curves, material was removed from the head (10) as described above. discharges (16) occur. In other words, discharges (16) occur side by side. The directions of the clamping and loosening contact surfaces (112) of the two contact areas are 5 Boundary lines obtained by continuing an imaginary straight line, another In other words, the imaginary head corresponding to the standard six-sided head form taken as the basis for the head (10). The boundary lines of the hexagon, and the concave curved surface extending between these contact regions (11). These are the areas between which there is no material. The radius values ​​of the first curve (12) and the second curve (13) are equal. Again The radius values ​​of the third curve (14) and the fourth curve (15) are also equal. As a result As can be seen in Figure 7, the central axis passes through the center of the connecting element (1). A symmetrical structure is obtained according to (M). Therefore, an equal number of clamping contact surfaces. (111) and disassembly contact surface (112) are present. As a result, a smoother 15 Consistency in results obtained in different metrics of torque distribution and fastening element (1) It has been ensured that the central axis (M) is located in two mutually contact regions (11). from the points where the area clamping contact surface (111) and the disassembly contact surface (112) intersect It is the passing axis. Considering the outline of the discharge (16) form, by means of concave springs Sharp edges were avoided by making transitions. In addition, the aforementioned discharges (16) between the hollow (17) and the inner and outer limits of the head (10) geometry The amount of material can cause stripping problems during the tightening and loosening process. It has been optimized to prevent this. The depth of discharge (16) and cavity (17), head (10) 25 in a way that maximizes material savings from weight, for the intended use The metric is determined according to the connecting element (1). The dimensions of the head (10) form correspond to the key width measurement preferred for different metrics. It can be revised in terms of design. The usability of the connecting element (1) is 30 In order to increase each geometric feature and dimensions in the form of the head (10), the key It is ratioed according to a specific coefficient based on the width measurement. The aforementioned link element (1) flange diameter (20), desired head (10) bearing surface It is determined according to the area it will have. Thus, the risk of loosening of the connecting element (1) By reducing the number of connections, connection security is increased. 35 11 The characteristic form of the head (10) is the main production in the production of fasteners (1). suitable for shaping techniques applied within the scope of cold forging process. It has been determined in such a way that there is no need for weight-reduced fasteners (1). It can be produced quickly and easily in high volumes at the points where it is needed. In an alternative configuration of the invention shown in Figures 18–20, the flange (20) and the first curve (12) between the contact regions (11) which are joined by the second curve (13), respectively a linear transition The surface comprises a curved transition surface followed by a second linear transition surface. Between the contact zones (11) that connect the third curve (14) and the fourth curve (15) The flange (20) contains only a linear transition surface. 10 In this configuration, the circumferential contour of the flange (20) is related to the relevant, as can be seen in Figure 20. to the clamping contact surfaces (111) and the desoldering contact surfaces in the contact areas (11) (112) are connected to the contact areas (11) in a tangential manner. Thus, the flange (20) The weight can be further reduced by removing unnecessary materials around it. Another 15 In other words, the outer diameter of the flange (20) defines the outer boundary of the head (10) and the contact areas (11) the imaginary circle passing through the outer endpoints of the tightening and loosening contact surfaces (112) It can be determined in such a way that it is essentially the same as the diameter. In light of all that has been said, the invention works as follows: The connecting element (1), standard 20 with the hexagonal drive apparatus (40), through the contact areas (11) located in its head (10). being grasped (See Figure 9 and Figure 10) and an equal number of squeezes in these contact areas (11) by rotating via the contact surfaces (111) and the disassembly contact surfaces (112) It can be assembled and disassembled. In addition, durability will not be reduced. The head (10) in the parts connecting the contact areas (11), four discharge (16) 25 It includes these discharges (16) respectively the first curve (12), the second curve (13), the third It forms the first curve (14) and the fourth curve (15). Due to the discharges (16), the material The weight can be reduced and decreased. Finally, if the connecting element (1) is a bolt, 30 from the center of the head (10). The hollow in the form of a quadrilateral symmetrical with respect to the passing central axis (M) (17) (essentially a (other gaps) allow for material reduction while maintaining rigidity and strength. It recognizes it. During assembly, the drive device (40) is rotated in the tightening direction (I). Tightening and loosening by applying force to the clamping contact surfaces (111) shown in Figure 11. By rotating in the direction (II), force 35 is applied to the disassembly contact surfaces (112) as seen in Figure 12. Removal can be accomplished by applying this method. 12 If the connecting element (1) is a nut, then the recess (17) is a male connection nut. It has a hole to allow connection to the element. This configuration is without a flange. The flanged version can be seen in Figures 13-14 and Figures 15-17 respectively. Therefore, the connecting element (1), the recess (17) on the head (10), the discharges (16) and 5 Thanks to four contact zones (11), compared to traditional hexagonal connectors This allows for sufficient torque transmission by using less material in the head region, and It allows for the preservation of mechanical strength. Four contact zones (11) Thanks to the four clamping and loosening contact surfaces (112) on it, clamping and loosening The distribution of torque applied during the process is ensured to be more homogeneous, and 10 especially during repeated assembly-disassembly operations for maintenance purposes, the head (10) part appears The risk of resulting abrasion and local deformation is reduced. In this way, the head (10) is used By eliminating unnecessary material, the total weight of the fastener (1) is significantly reduced. a reduction is achieved and costs are lowered through the use of less raw materials. contributions are being made. 15 In addition, tightening and loosening operations are performed over the same number of contact areas (11). to be realized and the head (10) form will be balanced around the drive axis during the design, scaling of the connecting element (1) to different metric dimensions 20 This facilitates and creates more homogeneous stress on the mold during cold forming production. It helps to ensure their distribution. In conclusion, it can be mounted with substandard corner drive fittings without compromising strength. A connecting element (1) with significantly reduced weight was developed without giving any weight. 25 The scope of protection of the invention is specified in the claims attached hereto, and these details are strictly adhered to. The explanation cannot be limited to those given for illustrative purposes. Because a technically skilled person... the person, without deviating from the main theme of the invention, in light of what has been described above, similar It is clear that these structures can emerge. 30 13 REFERENCE NUMBERS GIVEN IN THE FIGURE 1 Fastener Head 11 Contact Zone 5 111 Squeezing Contact Surface 112 Removal Contact Surface 12 First Arc 13 Second Arc 14 Third Arc 10 Fourth Arc 16 Unloading 17 Holes Flange Shaft 15 40 Drive Devices (I) Clamping Direction (II) Direction of Removal (M) Central Axis

Claims

14 REQUESTS 1. The invention is a connecting element (1) with a head (10); its characteristic is: to be mounted with standard six-sided drive devices (40) and to reduce weight as follows; 5 a disassembly contact surface (112) that enables torque transmission of the drive apparatus (40) and at least two contact zones (11) having at least one of a squeezing contact surface (111) including, between the contact zones (11) there is a first curve (12), a second curve (13), and a It includes a third curve (14) and a fourth curve (15), 10 The first curve (12) and the second curve (13) have the same radius value, The third curve (14) and the fourth curve (15) have the same radius value.

2. According to claim 1, a connecting element (1) has the property that the number of contact areas (11) There are four of them. 15 3. A connecting element (1) according to claim 1, and its characteristic is that each contact region (11), a disassembly contact surface (112) and a clamping contact that enables torque transmission It includes the surface (111).

4. According to claim 1, a connecting element (1) has the characteristic of being; the first curve (12) and the second The radius value of the curve (13) is the radius of the third curve (14) and the fourth curve (15). It is greater than its value.

5. According to claim 1, a connecting element (1) has the characteristic of having 25 between contact areas (11). the remaining part contains at least one cavity (17).

6. According to claim 1, a connecting element (1) has the following properties; first curve (12), second curve (13), at least one of the third arc (14) and the fourth arc (15) is a concave arc That is. 30 7. According to claim 1, a connecting element (1) has the characteristic of being; the drive apparatus (40) to the head. (10) after installation, first arch (12), second arch (13), third arch (14) and material from the part between the fourth curve (15) and the drive apparatus (40) It contains at least one discharge (16) resulting from the reduction. 35 8. A connecting element (1) according to claim 1, and its characteristic is; at least one flange (20) It includes.

9. According to claim 1, a connecting element (1) has the characteristic that the connecting element (1) is a bolt. It is that it contains a shaft (30). 5 10. According to claim 5, a connecting element (1) has the characteristic of being a quadrilateral groove (17). It is in the form of...

11. According to claim 1, a connecting element (1) has the property that the connecting element (1) is 10 It is a nut and the groove (17) is a hole with a circular cross-section.

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