Aircraft frame component, aircraft structural frame, and aircraft

Abstract

The present invention relates to a columnar aircraft frame component, an aircraft structural frame, and an aircraft. The columnar aircraft frame component includes: a first plug connector forming a first end of the columnar aircraft frame component; a second plug connector forming a second end of the columnar aircraft frame component, the second end being opposite to the first end; a first rod extending from the first plug connector towards the second plug connector; and a coupling member coupled to the second plug connector and configured to detachably couple with the first rod. The first rod has a circumferential outer surface that includes at least one ridged section and at least one smooth section that are alternately located on a circumferential path in a cross-section of the first rod, and each ridged section includes at least one ridge. The coupling member includes a tubular portion having a circumferential inner surface that includes at least one ridged section and at least one smooth section that are alternately located on a circumferential path in a cross-section of the tubular portion, and each ridged section includes at least one ridge.

Description

Technical Field

[0001] The present invention relates to an aircraft frame component, an aircraft structural frame having the aircraft frame component, and an aircraft having the aircraft structural frame. In particular, the present invention relates to a columnar aircraft frame component having a variable length, an aircraft structural frame including such a columnar aircraft frame component, and an aircraft having at least one aircraft structural frame. Background Art

[0002] The manufacture of complex structural frames (such as aircraft, especially aircraft fuselages) requires connecting a plurality of structural components to form the frame. This connection is usually accomplished using rivets or screws (each connection between two structural components requires a plurality of rivets or screws) or by welding or gluing. In addition, when setting rivets or screws, shims or other additional materials are required to compensate for the tolerances of the structural components and / or the unexpected distance between two structural components.

[0003] Such manufacture of complex structural frames is time-consuming and may result in internal stresses due to uncompensated tolerances. Summary of the Invention

[0004] Accordingly, it is an object of the present invention to provide a frame component and a structural frame that can be constructed in a simple and rapid manner, and to provide an aircraft that can be manufactured in a cost-effective manner.

[0005] This object is solved by the present invention as defined herein. Preferred embodiments can be learned from the following.

[0006] According to one aspect, a columnar aircraft frame component includes a first plug-and-turn connector forming a first end of the columnar aircraft frame component and a second plug-and-turn connector forming a second end of the columnar aircraft frame component, the second end being opposite the first end. The aircraft frame component (referred to simply as "frame component") further includes a first rod extending from the first plug-and-turn connector towards the second plug-and-turn connector and a coupling member coupled to the second plug-and-turn connector and configured to be detachably coupled to the first rod. Thus, the frame component can be fixed to other parts of a frame (such as an aircraft frame) in a simple and rapid manner by simply inserting the connector into other parts of the frame and rotating the connector for fixation.

[0007] The longitudinal direction of the columnar frame component is the direction from one end (i.e., the first plug-and-turn connector) along the length direction to the opposite end (i.e., the second plug-and-turn connector). The cross-section or cross-sectional area of the columnar frame component and especially of the first rod is arranged perpendicular to the longitudinal direction (or longitudinal axis) of the first rod.

[0008] The first rod has a circumferential outer surface that includes at least one ridged section and at least one plain section that are alternately located on a circumferential path in a cross-section of the first rod, where each ridged section includes at least one ridge. The circumferential path is the intersection curve of the outer surface of the first rod and the cross-section of the first rod. Thus, as traveling along the circumferential path on the outer surface of the first rod, a plain section follows a ridged section. There may be more than one ridged section, so that as traveling completely around the outer surface along the circumferential path, a plain section follows a ridged section, and then another ridged section follows this plain section, and so on.

[0009] If the first rod has a circular cross-section, each of the ridged section and the plain section corresponds to an arc or a segment of a circle. The at least one ridge of the ridged section extends over the entire arc, i.e., has the same length as the arc. The first rod may have different cross-sectional shapes, such as oval or rectangular with two opposite curved sides. The ridged section may be arranged at any segment of the circumferential outer surface, interrupted by plain sections.

[0010] In addition, the coupling member includes a tubular portion having a circumferential inner surface that includes at least one ridged section and at least one plain section that are alternately located on a circumferential path in a cross-section of the tubular portion, where each ridged section includes at least one ridge. For the first rod, the circumferential path is the intersection curve of the inner surface of the tubular portion and the cross-section of the tubular portion. Thus, as traveling along the circumferential path on the inner surface of the tubular portion, a plain section follows a ridged section. There may be more than one ridged section, so that as traveling completely around the inner surface along the circumferential path, a plain section follows a ridged section, and then another ridged section follows this plain section, and so on.

[0011] The tubular portion of the coupling member may have a circular cross-section, so that each of the ridged section and the plain section corresponds to an arc or a segment of a circle. The at least one ridge of the ridged section extends over the entire arc, i.e., has the same length as the arc. Similar to the first rod, the cross-sectional shape of the tubular portion may be different forms other than circular, such as oval or rectangular with two opposite curved sides.

[0012] The first rod is configured to be inserted into the tubular portion of the coupling member in a state where a cross-sectional projection of the at least one ridged section of the first rod coincides with a cross-sectional projection of the at least one smooth section of the coupling member. In other words, the cross-sectional projection of the first rod including the ridged section does not overlap with the cross-sectional projection of the inner opening of the tubular portion. This allows the first rod to be easily inserted into the tubular portion of the coupling member.

[0013] One of the first rod and the coupling member is configured to rotate relative to the other of the first rod and the coupling member so that the corresponding ridges of the first rod and the coupling member engage. Each ridged section of the first rod is located in the corresponding smooth section of the coupling member when inserted and is thus adjacent to the ridged section of the coupling member. When the first rod or the coupling member is rotated, the ridges of the first rod engage with the ridges of the coupling member. The ridges of the first rod and the coupling member are fixed to each other when engaged. In other words, the engaged ridges of the first rod and the coupling member prevent the first rod from detaching from the coupling member.

[0014] By inserting the first rod into the tubular portion of the coupling member, the length of the columnar frame assembly can be adjusted. Since the first rod can move freely in the longitudinal direction of the frame assembly within the tubular portion of the coupling member, any desired length of the frame assembly can be achieved as long as the ridged sections of the first rod can be engaged with the ridged sections of the coupling member by rotating the first rod and / or the coupling member. This provides for a quick and easy construction of the frame.

[0015] According to a variant, the rotational axis of the first plug connector coincides with the central longitudinal axis of the first rod. For example, when the first rod is rotated to couple with the coupling member, the plug connector is also rotated. Thus, the first rod can be used to insert and rotate the first plug connector.

[0016] Additionally or alternatively, the rotational axis of the second plug connector coincides with the central longitudinal axis of the coupling member. Similar to the first rod and the first plug connector, rotating the coupling member allows the second plug connector coupled to the coupling member to be inserted and rotated.

[0017] In addition, the first plug connector and the first rod may form an integral part of the frame assembly, such as a first longitudinal connector. The second plug connector and the coupling member may also form an integral part of the frame assembly, such as a second longitudinal connector. Due to the ridged section of the first rod and the tubular portion of the coupling member, the first rod and the coupling member can be mounted to each other at any desired length (i.e., the distance between the first plug connector and the second plug connector), as long as the ridged section of the first rod and the coupling member overlap in the longitudinal direction and can engage with each other.

[0018] In another variant, the frame assembly further includes a second rod extending from the second plug connector towards the first plug connector. The second rod may be formed in the same manner as the first rod. Thus, the second rod and the second plug connector may form a third longitudinal connector. This allows the same longitudinal connectors to be used at both ends of the frame assembly, thereby reducing the number of components required to form the frame assembly. Alternatively, longitudinal connectors with different longitudinal lengths may be manufactured, so that the frame assembly can be constructed in any desired length.

[0019] The coupling member may be coupled to the second plug connector by detachably coupling with the second rod. For example, the coupling member may have two opposite ends formed in the same manner, such as having another tubular portion for receiving the second rod as in the case of the first rod. According to one variant, the tubular portion of the coupling member may extend through the entire coupling member, so that the coupling member forms a connection sleeve. Alternatively, the coupling member includes two tubular portions, having corresponding openings at the respective opposite ends of the coupling member for receiving the corresponding rods.

[0020] According to one variant, the second rod has a circumferential outer surface, which includes at least one ridged section and at least one smooth section alternately located on a circumferential path in the cross-section of the second rod, wherein each ridged section includes at least one ridge. The second rod may be configured to be inserted into the tubular portion of the coupling member in a state where the cross-sectional projection of at least one ridged section of the second rod coincides with the cross-sectional projection of at least one smooth section of the coupling member. Similar to the first rod, at least one of the second rod and the coupling member may be configured to rotate relative to the other of the second rod and the coupling member, so that the corresponding ridges of the second rod and the coupling member engage.

[0021] In other words, if the first rod and the second rod at least have ridge sections with overlapping cross-sectional projections, the coupling member can be rotated to be detachably coupled to the first rod and the second rod simultaneously. This allows the frame assembly to be constructed in a very fast and efficient manner, thus significantly reducing the manufacturing time and cost of complex structural frames.

[0022] Alternatively, the second bayonet connector is fixed to or integrally formed with the coupling member. This forms a two-piece frame assembly that is easier to operate. For example, the first rod can be inserted into the tubular portion of the coupling member to the maximum extent, the frame assembly can be placed in the correct position in the frame, including adjusting the length of the frame assembly, and by rotating one of the first rod and the coupling member, the first rod and the coupling member are fixed to each other in their longitudinal directions. For example, by engaging the corresponding ridges of the first rod and the coupling member, the frame assembly can be set to the desired length and position.

[0023] According to another variant, the frame assembly may further include a fixing element that prevents relative movement between the first rod and the coupling member. It will be understood that the fixing element can also prevent relative movement between the second rod and the coupling member. Alternatively, another fixing element is employed to prevent relative movement between the second rod and the coupling member.

[0024] For example, the fixing element can be attached to the first rod / second rod and / or the coupling member in a manner that prevents relative rotation between the rod and the coupling member. Such a fixing element may include one or more protrusions or similar elements that engage corresponding recesses in the rod and / or the coupling member and are capable of transmitting loads in the circumferential direction between the fixing element and the rod and / or the coupling member. Additionally or alternatively, such circumferential loads can be transmitted by friction between the surface of the fixing element contacting the rod and the coupling member.

[0025] In yet another variant, the first bayonet connector and / or the second bayonet connector has at least one fastening element extending in a radial direction substantially perpendicular to the longitudinal axis of the corresponding first rod or second rod. Such a fastening element can be any form of protrusion extending in the radial direction from the remainder of the first bayonet connector / second bayonet connector. According to one variant of the embodiment, a plurality of protrusions can form the fastening element.

[0026] According to another variant of the embodiment, at least one of the protrusions extends at a specific angle with respect to the longitudinal axis in the radial direction, the angle being different from 90°. For example, at least one protrusion may extend at an angle between 75° and 90° with respect to the longitudinal axis of the first / second rod. Thus, the outermost end of the fastening element is located in a cross-section (perpendicular to the longitudinal axis) different from the root of the fastening element, the root of the fastening element being closer to the central longitudinal axis of the first / second plug connector.

[0027] Due to the ridges formed on the (corresponding) tubular portions of the first / second rod (hereinafter simply referred to as "rod") and the coupling member, various lengths of the frame assembly can be achieved. Specifically, depending on the number of ridges arranged on the rod and / or on the tubular portion of the coupling member, the rod can be fixed to the coupling member at any desired insertion depth. For example, if a plurality of ridges are arranged in the longitudinal direction of the rod and / or the tubular portion, the rod can be fixed to the coupling member once the first ridge of the rod can engage with the first ridge of the coupling member. In other words, at the moment when the rod has been inserted into the tubular portion of the coupling member such that one ridge of the rod has passed one ridge of the coupling member in the longitudinal direction, the engagement of these two ridges is possible and the rod and the coupling member can be fixed to each other. Thus, having a plurality of ridges on the rod and / or the coupling member provides for adjusting the length of the frame assembly.

[0028] The rotation angle for the complete engagement of the ridges of the rod and the ridges of the coupling member depends on the number and / or arc length of the ridged sections of both the rod and the coupling member. For example, there may be only one ridged section on the rod and the coupling member, which respectively occupies a quarter or a half of the circumferential path of the outer surface of the rod and the inner surface of the coupling member. Thus, for the complete engagement of the ridges, at least a quarter turn or a half turn of one of the rod and the coupling member is required.

[0029] It will be understood that the ridged section may have any desired dimensions along the outer surface of the rod / the inner surface of the coupling member. In the case where the rod and the coupling member have ridges of equal dimensions, their respective lengths are limited to half the length of the circumferential path of the respective outer surface / inner surface. Otherwise, the cross-sectional projections of the ridged sections will overlap and the rod cannot be inserted into the coupling member. Additionally, the dimensions of the ridged section of one of the rod and the coupling member may be different from the dimensions of the ridged section of the other of the rod and the coupling member. For example, when the coupling member has a ridged section that (in its circumferential direction) occupies (almost) three-quarters of the inner surface of its tubular portion, the rod may have a ridged section that occupies (almost) one-quarter of its outer surface. Thus, insertion of the rod and the coupling member into each other is still possible while allowing engagement over three-quarters of the inner surface of the coupling member. This provides reliable engagement and fixation.

[0030] The dimensions of the ridges outlined above do not limit the present disclosure. Instead, the ridges of the rod and the coupling member may have any dimensions (length along their respective circumferential paths) as long as their cross-sectional projections do not overlap.

[0031] Furthermore, at least one smooth section of at least one of the tubular portions of the rod and the coupling member may include a recess. The cross-sectional dimensions of such a recess may be slightly larger than the cross-sectional dimensions of the corresponding ridged section of the other of the rod and the coupling member. This provides for easy insertion since a small tilt of one of the rod and the coupling member will not cause the rod or the coupling member to be blocked before full insertion.

[0032] According to one embodiment variant, the at least one ridge of the ridged section of the rod and the at least one ridge of the ridged section of the coupling member may have a pitch value of zero. Thus, the ridges of the ridged section may all be in a plane parallel to the cross-section of the tubular portions of the rod and the coupling member. A frame assembly made of at least one rod and coupling member both having ridges with a pitch value of zero allows for the formation of a frame assembly of a specific length without generating forces in the longitudinal direction of the frame assembly. This reduces or completely avoids internal stresses in the frame assembly and the resulting frame.

[0033] According to another variant of the embodiment, the at least one ridge of the ridged section of the rod and the at least one ridge of the ridged section of the coupling member may have a pitch value greater than zero. In other words, each ridged section may form a thread, i.e., a section of thread interrupted by the smooth section. In the case where the pitch value is greater than zero, any desired length of the frame assembly (the distance between the first plug connector and the second plug connector) can be achieved. When one of the rotating rod and the coupling member is rotated, the corresponding ridged sections start to engage, and when the rotation continues, the degree to which the rod is inserted into the tubular portion of the coupling member increases due to the positive pitch value. It will be understood that a negative pitch value is also possible. In this case, the engagement of the corresponding ridged sections will provide for coupling the rod and the coupling member, and depending on the degree of rotation, will further provide for moving the rod out of the tubular portion of the coupling member. Thus, depending on the pitch value, any desired distance between the first plug connector and the second plug connector can be achieved. This allows for further compensation of any tolerances or clearances when the frame assembly is employed.

[0034] According to another variant of the frame assembly, the rod may include at least two ridged sections on a circumferential path in the cross-section of the rod, wherein the at least one ridge of the first ridged section may be positioned differently in the longitudinal direction of the rod than the at least one ridge of the second ridged section. In other words, when traveling along the circumferential path on the outer surface of the rod, the first ridged section is followed by a smooth section, which is followed by the second ridged section, and the second ridged section is followed by another smooth section. It will be understood that even more than two ridged sections may be arranged on the rod. The ridges of the first ridged section may be located in a plane parallel to the cross-section of the rod, while the ridges of the second ridged section may be located in a different plane that is also parallel to the cross-section of the rod and spaced apart from the plane of the ridges of the first ridged section by a distance. Thus, there is an offset distance between the plane in which the first ridged section is arranged and the plane in which the ridges of the second ridged section are arranged.

[0035] Then, the tubular portion of the coupling member may include a ridged section on a circumferential path in the cross-section of the tubular portion. The size of the ridged section of the tubular portion corresponds to at least one of the smooth sections of the rod. This allows the ridges of the rod and the ridges of the coupling member to engage at different levels when the rod is inserted into the tubular portion of the coupling member. Depending on the offset distance between the ridges of the two ridged sections of the rod, the coupling between the rod and the coupling member can be achieved with a fine spacing dimension. It is advantageous if the offset distance is less than the pitch of the ridges, i.e., the distance between two adjacent ridges, because the engagement of the ridges can be achieved at an insertion level of the rod and the coupling member that is less than the pitch.

[0036] According to another arrangement, the tubular portion of the coupling member may include at least two ridged sections, wherein the ridges of the first ridged section are offset from the ridges of the second ridged section in the longitudinal direction of the tubular portion. Thus, the rod having only one ridged section allows the rod and the corresponding ridges of the coupling member to engage with a fine spacing dimension (i.e., at an insertion level smaller than the pitch of the ridges).

[0037] According to another variant, the coupling member may include tool attachment means at at least one longitudinal end of the tubular portion, the tool attachment means being configured to receive a tool for rotating the coupling member. For example, the tool attachment means may include an external nut-like form or two or more holes provided in the front surface or the circumferential surface of the tubular portion of the coupling member.

[0038] According to another aspect, an aircraft structural frame includes: a frame assembly; at least one structural element, such as an element of an aircraft structure; and at least one attachment element fixed to one of the at least one structural element. The frame assembly may be any frame assembly of the above aspects and variants.

[0039] The attachment element has an opening configured to receive the first rotational connector or the second rotational connector and is configured to hold the first rotational connector or the second rotational connector in the longitudinal direction of the frame assembly if the received first rotational connector or second rotational connector rotates a predetermined degree in the opening. Receiving the first rotational connector or the second rotational connector means that the first rotational connector / second rotational connector moves generally in the longitudinal direction of the frame assembly while at least a portion of the first rotational connector / second rotational connector mates with the opening during this movement.

[0040] The opening includes a first section that extends from the outer surface towards the structural element in the insertion direction (the insertion direction being parallel to the longitudinal direction of the frame assembly). The first section may have a cross-sectional shape corresponding to the circumferential profile of the first plug connector or the second plug connector (perpendicular to the insertion direction). The circumferential profile of the first plug connector or the second plug connector is the profile of the cross-sectional projection of the front surface of the first plug connector or the second plug connector. The cross-sectional shape of the opening includes at least one protrusion that protrudes towards the central axis of the opening in a direction substantially perpendicular to the insertion direction. Additionally, the opening includes a second section that further extends from the first section in the insertion direction. The second section has a circular or square cross-sectional shape, having a cross-sectional extension of at least the widest part of the first section. In other words, the opening may have a circular or square cross-sectional form (a can-like shape), and in the region defined by the outer surface of the attachment element (i.e., the region corresponding to the first section), one or more protrusions towards the central axis of the opening are provided. However, the protrusions only partially extend in the insertion direction within the range of the first section.

[0041] Furthermore, the first plug connector or the second plug connector includes a first section that extends along its longitudinal direction from the respective first rod or second rod. The first section of the first plug connector or the second plug connector may have a circular or square cross-sectional shape corresponding to the minimum cross-sectional dimension of the first section of the opening. In other words, even when the first plug connector / second plug connector rotates, the first section of the first plug connector or the second plug connector fits through the protrusions arranged in the first section of the opening. The first plug connector or the second plug connector includes a second section that further extends along the longitudinal direction from the first section. The second section may have an irregular circumferential profile that forms at least one fastening element.

[0042] The irregular circumferential profile of the first plug connector or the second plug connector may be conceived as at least one protrusion that extends radially away from the central longitudinal axis of the first plug connector or the second plug connector and extends along the longitudinal direction within the range of the second section. The root of the protrusion is located in the region of the first section of the first plug connector / second plug connector, so that the protrusion also extends radially away from the outer circumferential surface of the first section of the first plug connector / second plug connector.

[0043] The longitudinal extent of the first section of the first plug-in connector or the second plug-in connector can be at least that of the first section of the associated opening. In other words, when looking along the longitudinal axis of the first plug-in connector or the second plug-in connector, the first section is long enough to pass through the first section of the opening, i.e., through the innermost region of the protrusion formed in the first section of the opening.

[0044] Furthermore, the longitudinal extent of the second section of the opening is at least that of the second section of the first plug-in connector or the second plug-in connector. Thus, the second section of the first plug-in connector or the second plug-in connector is adapted to the second section of the opening. Similarly, the radial extent of the opening in the first and second sections of the opening is at least that of the corresponding first and second sections of the first plug-in connector or the second plug-in connector.

[0045] In a variant, the extent of the protrusion of the opening in the circumferential direction and / or the extent of the protrusion of the first plug-in connector / second plug-in connector can coincide with or at least be similar to the extent of the ridged section of the rod and / or the coupling member in the circumferential direction. Additionally, the number of protrusions can correspond to the number of ridged sections on the rod. Thus, when the rod is rotated, the associated first plug-in connector / second plug-in connector can engage in the opening of the attachment element, and at the same time, the ridges of the rod and the coupling member can engage with each other. Thus, the frame assembly is fixed to the attachment element while the components of the frame assembly are coupled to each other. This reduces the manufacturing time of the aircraft structural frame.

[0046] According to another variant, the aircraft structural frame (referred to simply as the "structural frame") can further include a fixing element that prevents relative movement between the frame assembly and the attachment element. For example, the fixing element can be attached to the first plug-in connector / second plug-in connector or the corresponding rod and / or the attachment element in a manner that prevents relative rotation between the plug-in connector and the attachment element. Such a fixing element can include one or more protrusions or similar elements that engage with corresponding recesses in the frame assembly and / or the attachment element and are capable of transmitting loads in the circumferential direction between the fixing element and the frame assembly and / or the attachment element. Additionally or alternatively, such circumferential loads can be transmitted by friction between the surface of the fixing element contacting the frame assembly and the attachment element. Furthermore, the fixing element can cover at least a portion of the plug-in connector received in the attachment element and at least a portion of the attachment element. This provides protection to the attachment element at the plug-in connector from negative influences (such as impacts, moisture, water, corrosive fluids, etc.).

[0047] According to a variant, the at least one attachment element is fixed to one of the at least one structural element by 3D printing. For example, the at least one attachment element can be directly formed on the structural element by a printing method. Alternatively, the attachment element can be pre-formed and subsequently fixed to the structural element, for example, by welding, gluing or riveting.

[0048] According to another variant, the at least one attachment element is made of an alloy. For example, the at least one attachment element can be made of AlMgSc. This allows the attachment element to be formed by a 3D printing method. In addition, the attachment element made of AlMgSc provides further advantages and properties, such as being a high-strength material, resistant to water including brine and salt solutions, and being a weldable material. Thus, such an attachment element can be applied to the structural frame in a very fast manner, thereby reducing the cost and time of manufacturing the frame.

[0049] The structural element can be a beam, a frame, a truss or any other structural element forming part of a frame. For example, the structural element can be an element of the fuselage of a vehicle such as an aircraft. In addition, the structural element can be formed by extrusion.

[0050] Furthermore, according to a variant of an embodiment, the structural frame further includes a structural connector, which includes at least two attachment elements. Such a structural connector can be regarded as at least two attachment elements mounted to each other so that a number of frame components up to the number of attachment elements of the structural connector can be connected to each other.

[0051] For example, the first swivel connector or the second swivel connector is received in the first attachment element of the at least two attachment elements, and the third swivel connector of another frame component is received in the second attachment element of the at least two attachment elements. Thus, two or more frame components can be joined to form a skeleton.

[0052] In its variant, the structural connector is configured to have a fixed or variable angle between the respective insertion directions of the at least two attachment elements. The fixed angle between the respective insertion directions provides a very rigid structural connector to achieve a reduction in the movement tolerance of the attached frame components. On the other hand, the variable angle increases the flexibility of the frame.

[0053] According to another aspect, an aircraft includes at least one structural frame. The at least one structural frame can be manufactured according to any of the above aspects and variants. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The preferred embodiments of the frame component, the structural frame and the aircraft are described in more detail with reference to the attached schematic drawings below, in which:

[0055] Figure 1 Show (a) a perspective view of a longitudinal connector, (b) a cross-sectional view of a coupling member, and (c) a perspective view of the coupling member,

[0056] Figure 2 Show (a) a perspective view of a frame assembly, (b) a cross-sectional view of a coupling member with two longitudinal connectors coupled thereto, (c) a cross-sectional view of a portion of the coupling member into which a portion of the longitudinal connector is inserted, and (d) a cross-sectional view of the portion of the coupling member when the portion of the longitudinal connector is rotated and coupled to the coupling member,

[0057] Figure 3 Show (a) a perspective view of an attachment element, (b) a perspective view of a longitudinal connector, (c) a perspective view of the longitudinal connector received and held by the attachment element, and (d) a perspective view of another variant of a plug connector and a corresponding attachment element,

[0058] Figure 4 Show (a) a side view of an attachment element and a longitudinal connector, (b) a perspective view of details of an opening of a plug connector and an attachment element of the longitudinal connector, and (c) a perspective view of the plug connector during insertion into the opening of the attachment element,

[0059] Figure 5 Show (a) a side view of the longitudinal connector inserted into the opening of the attachment element and (b) a cross-sectional view when the plug connector and the attachment element are coupled to each other,

[0060] Figure 6 Show (a) a side view of an aircraft having a structural frame, (b) a perspective view of details of the structural frame, and (c) an illustrative view of details of a frame assembly of an attachment element mounted to the structural frame,

[0061] Figure 7 Schematic view showing a plan view of a section of an opening of an attachment element receiving a plug connector,

[0062] Figure 8 Show a cross-sectional view of an integral attachment element coupled with a longitudinal connector,

[0063] Figure 9 Schematically show (a) a cross-sectional view of a frame assembly having two separate longitudinal connectors and (b) a cross-sectional view of a frame assembly having coupled longitudinal connectors,

[0064] Figure 10 Schematically show (a) a cross-sectional view of a variant of a frame assembly having one separate longitudinal connector and (b) a cross-sectional view of a variant of a frame assembly having coupled longitudinal connectors, and

[0065] Figure 11 A cross-sectional view schematically showing a structural connector for a structural frame is presented. DETAILED DESCRIPTION

[0066] The following detailed description of the schematic diagrams focuses on exemplary frame components and variations and implementations of the structural frame. The present disclosure is not limited to the described and illustrated components and frames, but includes combinations of their variations and implementations as described.

[0067] Figure 1 (a) A perspective view showing a longitudinal connector 11 of a frame component 10 is presented. The longitudinal connector 11 includes a swivel connector 101 and a rod 110 extending longitudinally from the swivel connector 101. The rod 110 has a circumferential outer surface that includes at least one ridged section 111 and at least one smooth section 112 that are alternately located on a circumferential path in the cross-section of the rod. Each ridged section 111 includes at least one ridge 113. The ridged sections 111 extend longitudinally on the outer surface such that a plurality of ridges 113 are arranged parallel to each other.

[0068] Figure 1 (b) A cross-sectional view showing a coupling member 12 of the frame component 10 is presented. The coupling member 12 includes a tubular portion 120 that may extend throughout the length of the coupling member 12 (as shown) or may extend only over a portion of the coupling member 12 in the longitudinal direction (along the central axis A3 of the coupling member 12). The tubular portion 120 has a circumferential inner surface that includes at least one ridged section 121 and at least one smooth section 122 that are alternately located on a circumferential path in the cross-section of the tubular portion 120. Each ridged section 121 includes at least one ridge 123. In the direction of the central axis A3, the coupling member 12 may have a single ridged section 121 and a single smooth section 122. Alternatively, as Figure 1 shown in (b), two ridged sections 121 and two smooth sections 122 may be arranged on the circumferential inner surface, which are disconnected by a smooth section extending around the entire circumferential path in the cross-section of the tubular portion 120.

[0069] Figure 1 (c) A perspective view showing the coupling member 12 is presented. As Figure 1 illustrated in (c), more than one ridged section 121 and more than one smooth section 122 may be arranged along the circumferential path in the cross-section of the tubular portion 120. For example, the ridged section 121 may correspond to the smooth section 112 of the rod 110, such that the rod 110 may be inserted into the tubular portion 120 of the coupling member 12 in a state where the cross-sectional projection of at least one ridged section 111 of the rod 110 coincides with the cross-sectional projection of at least one smooth section 122 of the coupling member 12.

[0070] This insertion state is shown in Figure 2 (a), Figure 2 (a) shows a perspective view of the frame assembly 10. The frame assembly 10 includes a coupling member 12 and a first longitudinal connector 11 having a first plug connector 101. The first longitudinal connector (particularly its first rod 110) is inserted into the first tubular portion 120 of the coupling member 12. At the other end of the coupling member 12, there is a second longitudinal connector 11 having a second plug connector 102. The first plug connector 101 forms the first end of the columnar frame assembly 10, and the second plug connector 102 forms the second end of the columnar frame assembly 10, where the second end is opposite to the first end.

[0071] Figure 2 (b) shows a cross-sectional view of the coupling member 12 of the frame assembly 10, with two longitudinal connectors 11 coupled to the coupling member 12. In particular, the first rod 110 of the first longitudinal connector 11 is inserted into one end (tubular portion 120) of the coupling member 12, and the second rod 110 of the second longitudinal connector 11 is inserted into the opposite end (tubular portion 120) of the coupling member 12. For example, the central axis A3 of the coupling member 12 may coincide with the central axis A2 of the rod 110.

[0072] Since the ridged section 111 of the rod 110 coincides with the smooth section 122 of the coupling member 12 in the cross-sectional projection, the rod 110 can be inserted into the coupling member 12 to any desired extent. As Figure 2 (b) illustrates, the upper rod 110 is inserted further into the coupling member 12 than the lower rod 110. Thus, any desired distance Δ between the upper rod 110 and the lower rod 110 can be achieved, thereby achieving any desired distance between the first plug connector 101 and the second plug connector 102. Therefore, the length of the frame assembly 10 can be adjusted to any desired extent as long as the rod 110 and the coupling member 12 have sufficient overlap. Sufficient overlap can be achieved by engaging three or more ridges 113 of the rod 110 with corresponding three or more ridges 123 of the coupling member 12.

[0073] In Figure 2 (c) and Figure 2 (d), the engagement of the ridges 113, 123 can be seen, Figure 2 (c) and Figure 2(d) shows a cross-sectional view of a part of the coupling member 12 in which a part of the longitudinal connector 11 is inserted and a cross-sectional view of the part of the coupling member 12 when the part of the longitudinal connector 11 is rotated and coupled to the coupling assembly 12. More specifically, the rod 110 is arranged relative to the coupling member 12 such that at least one smooth section 112 of the rod 110 coincides with at least one ridged section 121 of the coupling member 12. This allows the rod 110 to move in the longitudinal direction of the frame assembly 10 (i.e., parallel to the central axis A2 of the rod 110). This movement allows adjustment of the length of the frame assembly 10, i.e., to achieve the desired distance between the first plug-in connector 101 and the second plug-in connector 102.

[0074] When the desired degree of insertion of the rod 110 is achieved, the rod 110 and / or the coupling member 12 can be rotated relative to each other, thereby engaging the corresponding ridges 113 and 123 of the rod 110 and the coupling member 12. This is illustrated in Figure 2 (d) showing the engaged ridges 113, 123. Due to this engagement of the ridges 113, 123, the rod 110 is coupled to the coupling member 12 in a manner that allows the rod 110 to move in the longitudinal direction of the frame assembly 10.

[0075] Figure 3 (a) shows a perspective view of the attachment element 201 forming part of the structural frame. The attachment element 201 has an opening 210 for receiving the plug-in connectors 101, 102 shown in more detail in Figure 3 (b). Figure 3 (b) shows a perspective view of the longitudinal connector 11. The opening 210 extends from the outer surface 214 into the attachment element 201 along the insertion direction ( Figure 3 from the top to the bottom in (a)). The upper part of the opening 210 (at the outer surface 214) may have a cross-sectional shape corresponding to the circumferential profile of the plug-in connectors 101, 102. For example, at least one protrusion 213 may be formed in a direction substantially perpendicular to the insertion direction. At least one protrusion 213 of the opening 210 may correspond to the recess formed between the fastening elements 114 of the plug-in connectors 101, 102 as illustrated in Figure 3 (b).

[0076] This allows at least a portion of the plug connectors 101, 102 to be inserted into the opening 210 of the attachment element 201, whereby the fastening element 114 passes through the opening 210 adjacent to the projection 213. The rotational axis A1 of the plug connectors 101, 102 can coincide with the central longitudinal axis A2 of the rod 110. Thus, rotation of the rod 110 also causes the fastening element 114 to rotate within the opening 210. Rotating the plug connectors 101, 102 in the opening 210 by a predetermined degree causes the fastening element 114 to enter a position overlapping with the projection 213 of the attachment element 201 (in a top view along the central longitudinal axis A2 of the rod 110). This provides for holding the plug connectors 101, 102 in the longitudinal direction of the frame assembly 10 by the attachment element 201, which is illustrated in Figure 3 (c), Figure 3 (c) shows a perspective view of the longitudinal connector 11 received and held by the attachment element 201. In the example of Figure 3 (a)- Figure 3 (c) with three fastening elements 114 and three projections 213 in the opening 210, one-sixth of a full turn (i.e., 60°) is required to rotate the plug connectors 101, 102 into the holding position, i.e., to bring the fastening element 114 into an overlapping position relative to the projection 213 of the attachment element 201.

[0077] In Figure 3 (d), a perspective view illustrates another variant of the plug connectors 101, 102 and the corresponding attachment element 201 separated from each other. Here, the attachment element 201 has an opening 210 with four projections 213 protruding towards the central axis of the attachment element 201. Correspondingly, the plug connectors 101, 102 have four fastening elements 114, and the fastening elements 114 are dimensioned to fit through the remaining opening 210, i.e., between the projections 213 of the attachment element 201. Thus, one-eighth of a full turn (i.e., 45°) is required to bring the plug connectors 101, 102 into the holding position so that the fastening elements 114 overlap with the projections 213 of the attachment element 201.

[0078] It will be understood that the number of fastening elements 114 and projections 213 is not limited to three or four as shown in the figure. The plug connectors 101, 102 may similarly have more or fewer fastening elements 114, such as one, two, five, six, etc., and the attachment element 201 has a corresponding number of projections 213. In addition, the number of fastening elements 114 may also not be equal to the number of projections 213 in the attachment element 201. For example, the plug connectors 101, 102 may have fewer fastening elements 114 than the projections 213 in the attachment element 201. As long as the position of the fastening element 114 coincides with the remaining part of the opening 210 between the projections 213 such that the fastening element 114 can be inserted into the opening 210, and as long as the rotation of the plug connectors 101, 102 brings the fastening element 114 into a position overlapping the projection 213, the frame assembly 10 can be attached and mounted to the attachment element 201.

[0079] In addition, the attachment element 201 may include a stop element (not shown) within the opening 210. Such a stop element can prevent the plug connectors 101, 102 from rotating further than the overlapping position, thereby avoiding the loosening of the plug connectors 101, 102 from the attachment element 201 due to rotating the plug connectors 101, 102 beyond a required predetermined degree. Such a stop element can be implemented by a projection protruding parallel to the longitudinal axis of the attachment element 101 within the opening, such that the fastening element 114 abuts against the stop element after rotating a predetermined degree.

[0080] Figure 4 (a) shows a side view of the attachment element 201 and the longitudinal connector 11 in a separated state. The plug connectors 101, 102 include a first section 118 extending from the rod 110 along the longitudinal direction of the rod (i.e., parallel to the central axis A2). The first section 118 has a circular or square cross-sectional shape, which corresponds to the minimum cross-sectional dimension of the opening 210 at the projection 213. The plug connectors 101, 102 include a second section 119 extending further from the first section 118 along the longitudinal direction. The second section 119 has an irregular circumferential profile, thereby forming at least one fastening element 114.

[0081] Figure 4 (b) shows a perspective view of the details of the plug connectors 101, 102 of the longitudinal connector 11 and the opening 210 of the attachment element 201. In particular, Figure 4(b) shows a perspective view of the longitudinal connector 11 and the attachment element 201, in which the plug connectors 101, 102 of the longitudinal connector 11 are aligned with the opening 210 of the attachment element 201. In other words, the cross-sectional projection of the front surfaces of the plug connectors 101, 102 enters a state of overlapping with the opening 210. In this overlapping state, the plug connectors 101, 102 can be inserted into the opening 210, which is illustrated in Figure 4 (c). Figure 4 (c) shows a perspective view of the plug connectors 101, 102 during insertion into the opening 210 of the attachment element 201.

[0082] Insertion is completed when the adjacent elements 116 of the plug connectors 101, 102 abut the outer surface 214 of the attachment element 201, which is illustrated in Figure 5 (a). Figure 5 (a) shows a side view of the longitudinal connector 11 inserted into the opening 210 of the attachment element 201. The cross-section of this state is illustrated in Figure 5 (b). Figure 5 (b) shows a cross-sectional view of the plug connectors 101, 102 and the attachment element 201 when they are coupled to each other.

[0083] More specifically, the surface 117 of the adjacent element 116 abuts the outer surface 214 of the attachment element 201. It will be understood that, depending on the variant of the longitudinal connector 11, the adjacent element 216 may be omitted. For example, the outermost surface 115 (the front surface 215 thereof) of the plug connectors 101, 102 may abut the innermost surface 215 of the attachment element 201, so that the surface 115 forms the adjacent element.

[0084] In any case, the first section 118 of the plug connectors 101, 102 is arranged close to the first section 211 of the opening 210, where the first section 211 extends from the outer surface 214 in the insertion direction (downward in Figure 5 (b)). As illustrated in Figure 4 (b), the first section 211 of the opening 210 has a cross-sectional shape corresponding to the circumferential profile of the plug connectors 101, 102. The attachment element 201 or its opening 210 includes a second section 212 that further extends from the first section 211 in the insertion direction. The second section 212 has a circular or square cross-sectional shape that has a cross-sectional extension range of at least the widest part of the first section 211 of the opening 210. Since the second section 119 of the plug connectors 101, 102 is adapted to pass through the opening 210 at the first section 211 of the opening 210, the second section 212 of the opening 210 is wide enough for the second section 119 of the plug connectors 101, 102 to rotate about the rotation axis A1 of the plug connectors 101, 102.

[0085] As Figure 5 (b) further illustrates, the outer surface 214 and / or the innermost surface 215 of the attachment element 201 may have a circular or spherical shape. Additionally, the adjacent surface 117 and / or the outermost surface 115 of the plug connectors 101, 102 may have a circular or spherical shape corresponding to the outer surface 214 and / or the innermost surface 215 of the attachment element 201. This provides the longitudinal connector 11 and thus the frame assembly 10 with freedom of movement about the center point C. Accordingly, the attachment element 201 and the plug connectors 101, 102 may form a ball-and-socket joint. The range of the protrusion 213 and / or the plug connectors 101, 102 in the radial direction at their first section 118 may limit the movement of the frame assembly 10 about the center point C.

[0086] Alternatively, the surfaces 115, 117 of the plug connectors 101, 102 and / or the surfaces 214, 215 of the attachment element 201 may be flat. According to another variant, the protrusion 213 of the attachment element 201 may extend in the radial direction such that the circumferential outer surface of the plug connectors 101, 102 at their first section 118 abuts against the protrusion 213 as much as possible, thereby hindering the movement of the longitudinal connector 11 and the frame assembly 10.

[0087] Figure 6 (a) shows a perspective view of an aircraft 100 having a structural frame 20, and the structural frame 20 is partially schematically shown in Figure 6 (b) which is a perspective view of a detail of the structural frame 20. The structural frame 20 includes at least one structural element 202, such as an extruded beam, a strut, a rib, a frame, a spar, etc. The attachment element 201 may be fixed to one of the structural elements 202, for example, by welding, riveting or 3D printing methods. Alternatively, the attachment element 201 may be integrally formed with at least one of the structural elements 202.

[0088] The structural frame 20 is formed by connecting the frame assembly 10 to the structural element 202. As Figure 6 (c) illustrates, this is achieved by receiving the plug connectors 101, 102 of the frame assembly 10 in the openings 210 of the attachment element 201 in the order illustrated in Figure 4 and Figure 5 and rotating the plug connectors 101, 102 in the openings 210 into a holding state. In this holding state, the fastening elements 114 of the plug connectors 101, 102 are arranged to overlap with the protrusion 213 of the attachment element 201, so that the frame assembly 10 is held by the attachment element 201 at least in the longitudinal direction of the frame assembly 10.

[0089] Figure 7Schematic diagram showing a plan view of the opening 210 of the attachment element 201 receiving the second section 119 of the plug connectors 101, 102. This plan view only includes the second section 119 of the plug connectors 101, 102 to illustrate the interrelationship between the first section 211 of the attachment element 201 and the second section 119 of the plug connectors 101, 102. Figure 7 The plan view illustrated in Figure 4 corresponds to the state of the structural component 20 shown in

[0090] The plug connectors 101, 102 include four fastening elements 114 received in the first section 211 of the opening 210, where the fastening elements 114 pass through the recess formed between the four protrusions 213 of the attachment element 201. As seen from Figure 7 the example illustrated in Figure 7 the second section 212 of the opening 210 is wider in the radial direction, so that the plug connectors 101, 102 can move to a certain extent within the opening 210. After Figure 5 the state illustrated, and when the plug connectors 101, 102 are fully inserted into the opening 210 (see

[0091] Figure 8 a cross-sectional view of the integral attachment element 201 with the longitudinal connector 11 coupled is shown. The integral attachment element 201 can be a part of the structural element 202. In other words, by providing the opening 210, the integral attachment element 201 can be formed in the structural element 202. In the case where the adjacent surfaces 214, 215 of the opening 210 are uneven, as Figure 8 illustrated in

[0092] Figure 8 a sealant 310 provided between the adjacent surface 214 of the attachment element 201 and the adjacent surface 117 of the plug connectors 101, 102 is additionally illustrated. This sealant 310 prevents moisture and water from entering the opening 210. Therefore, corrosion and other damages of the structural element 202 caused by moisture or water can be prevented. In addition, the sealant 310 can further form a fixing element to prevent the longitudinal connector 11 from rotating when the longitudinal connector 11 is coupled to the integral attachment element 201. For example, due to the friction achieved by the sealant 310 between the longitudinal connector 11 and the attachment element 201, the longitudinal connector 11 is prevented from rotating and thus the plug connectors 101, 102 are prevented from loosening from the attachment element 201.

[0093] Figure 9 (a) A cross-sectional view schematically showing a frame assembly 10 having two separate longitudinal connectors 11. The frame assembly 10 includes a coupling member 12, and the coupling member 12 has a tubular portion 120 extending through the entire length of the coupling member 12. The tubular portion 120 has at least two ridged sections 121 in its longitudinal direction.

[0094] The longitudinal connectors 11 can be inserted into the tubular portion 120 of the coupling member 12 from both sides, wherein the ridged sections (not shown) of the longitudinal connectors 11 coincide with the smooth section 122 of the coupling member 12.

[0095] Figure 9 (b) A cross-sectional view schematically showing a frame assembly 10 having the longitudinal connectors 11 coupled. After inserting the longitudinal connectors 11 into the coupling member 12, the longitudinal connectors 11 and / or the coupling member 12 can be rotated so that the ridges 113 of the ridged sections 111 of the longitudinal connectors 11 engage with the ridges 123 of the coupling member 12. In this state, the longitudinal connectors 11 are prevented from moving in the longitudinal direction of the frame assembly 10.

[0096] To avoid rotational movement of the longitudinal connectors 11 or the coupling member 12 that would disengage the ridges 113, 123, the frame assembly 10 includes a fixing element 301. A fixing element 301 can be provided for each longitudinal connector 11, and the fixing element 301 prevents relative movement between the rod 110 of the longitudinal connector 11 and the coupling member 12. For example, the fixing element 301 can have a protrusion that engages with a corresponding recess (not shown) on the coupling member 12 to prevent rotational movement of the fixing element 301 relative to the coupling member 12. Additionally, corresponding means for preventing rotational movement between the fixing element 301 and the longitudinal connector 11 are provided at the section where the fixing element 301 engages with the longitudinal connector 11. For example, the cross-sections of the longitudinal connector 11 and the fixing element 301 can have corresponding circumferential surfaces that are irregular in the cross-section, thereby forming corresponding protrusions and recesses (not shown).

[0097] Figure 10 (a) A cross-sectional view schematically showing a variant of the frame assembly 10 having separate longitudinal connectors 11. Compared with the Figure 9 frame assembly 10 illustrated in Figure 10 the coupling member 12 of the frame assembly 10 has a tubular portion 120 that terminates in the longitudinal direction within the coupling member 12. At opposite ends of the coupling member 12, a second plug connector 102 is fixed to the coupling member 12 or is integrally formed with the coupling member 12.

[0098] The first longitudinal connector 11 (inFigure 10 as illustrated at the bottom) and the functions of the coupling member 12 are the same as those Figure 9 illustrated. The only difference is that only one longitudinal connector 11 has to be rotated relative to the coupling member 12 so that the respective ridges 113, 123 of the longitudinal connector 11 and the coupling member 12 (see Figure 10 (b)) engage. Compared with the Figure 9 frame assembly 10, this type of frame assembly 10 is suitable for a structural frame that requires a shorter frame assembly 10. Figure 10 An advantage of the frame assembly 10 is that the number of parts required to construct the frame assembly 10 is reduced.

[0099] Figure 11 A cross-sectional view schematically showing a structural connector 205 for a structural frame 20 is shown. The structural connector 205 includes at least two attachment elements 201 or at least openings 210 corresponding to at least two attachment elements 201. Figure 11 A structural connector 205 having a combined four attachment elements 201 is illustrated. However, a structural connector 205 including any number of openings 210 can be constructed. Each opening 210 is adapted to receive a respective plug connector 101, 102. Thus, at least two frame assemblies 10 can be attached to each other.

[0100] For example, the insertion directions of the openings 210 can be arranged at an angle α so as to be able to construct a framework. This angle between the insertion directions of the openings 210 can be fixed or variable so as to be able to construct any desired framework.

Claims

1. A columnar aircraft frame assembly (10), comprising: A first plug connector (101) forming the first end of the columnar aircraft frame assembly (10), the first plug connector being arranged to be received in a first opening of a first attachment element, and the first plug connector being arranged such that: if the first plug connector rotates a first predetermined angle about a first axis of rotation in the first opening, then the first plug connector is held in the longitudinal direction of the columnar aircraft frame assembly; A second plug connector (102) forming the second end of the columnar aircraft frame assembly (10), the second end being opposite to the first end, the second plug connector being arranged to be received in a second opening of a second attachment element, and the second plug connector being arranged such that: if the second plug connector rotates a second predetermined angle about a second axis of rotation in the second opening, then the second plug connector is held in the longitudinal direction of the columnar aircraft frame assembly; A first rod extending from the first plug connector (101) towards the second plug connector (102); A coupling member (12) coupled to the second plug connector (102) and configured to be detachably coupled to the first rod, wherein the first rod has a circumferential outer surface, the circumferential outer surface comprising at least one ridged section and at least one smooth section alternately located on a circumferential path in a cross-section of the first rod, and wherein each ridged section of the circumferential outer surface comprises at least one ridge (113), wherein the coupling member (12) comprises a tubular portion (120) having a circumferential inner surface, wherein the circumferential inner surface comprises at least one ridged section (121) and at least one smooth section (122) alternately located on a circumferential path in a cross-section of the tubular portion (120), and wherein each ridged section (121) of the circumferential inner surface comprises at least one ridge (123), wherein the first rod is configured to be inserted into the tubular portion (120) of the coupling member (12) in a state where a cross-sectional projection of the at least one ridged section of the first rod coincides with a cross-sectional projection of the at least one smooth section (122) of the coupling member (12), and wherein one of the first rod and the coupling member (12) is configured to rotate relative to the other of the first rod and the coupling member (12) such that the corresponding ridges (113, 123) of the first rod and the coupling member (12) engage.

2. The columnar aircraft frame assembly (10) according to claim 1, wherein the first axis of rotation of the first plug connector (101) coincides with the central longitudinal axis (A2) of the first rod, and / or wherein the second axis of rotation of the second plug connector (102) coincides with the central longitudinal axis (A3) of the coupling member (12).

3. The columnar aircraft frame assembly (10) according to claim 1 or 2, further comprising: A second rod extending from the second plug connector (102) towards the first plug connector (101), wherein the coupling member (12) is coupled to the second plug connector (102) by detachably coupling with the second rod.

4. The columnar aircraft frame assembly (10) according to claim 3, wherein the second rod has a circumferential outer surface including at least one ridged section and at least one smooth section alternately located on a circumferential path in a cross-section of the second rod, and each ridged section of the circumferential outer surface of the second rod includes at least one ridge (113), wherein the second rod is configured to be inserted into the tubular portion (120) of the coupling member (12) in a state where a cross-sectional projection of the at least one ridged section of the second rod coincides with a cross-sectional projection of the at least one smooth section (122) of the coupling member (12), and wherein one of the second rod and the coupling member (12) is configured to rotate relative to the other of the second rod and the coupling member (12) so that corresponding ridges (113, 123) of both the second rod and the coupling member (12) engage.

5. The columnar aircraft frame assembly (10) according to claim 1 or 2, wherein the second plug connector (102) is fixed to the coupling member (12) or integrally formed with the coupling member (12).

6. The columnar aircraft frame assembly (10) according to claim 1 or 2, further comprising: A fixing element (301) for preventing relative movement between the first rod and the coupling member (12).

7. The columnar aircraft frame assembly (10) according to claim 3, wherein the first plug connector (101) and / or the second plug connector (102) has at least one fastening element (114) extending in a radial direction perpendicular to the longitudinal axis (A2) of the corresponding first rod or second rod.

8. An aircraft structural frame (20), comprising: A columnar aircraft frame assembly (10), the columnar aircraft frame assembly comprising: - A first plug connector (101) forming a first end of the columnar aircraft frame assembly (10); - A second plug connector (102) forming a second end of the columnar aircraft frame assembly (10), the second end being opposite to the first end; - A first rod extending from the first plug connector (101) towards the second plug connector (102); - A coupling member (12) coupled to the second plug connector (102) and configured for detachably coupling with the first rod, - wherein the first rod has a circumferential outer surface including at least one ridged section and at least one smooth section alternately located on a circumferential path in a cross-section of the first rod, and each ridged section of the circumferential outer surface includes at least one ridge (113), - wherein the connecting member (12) includes a tubular portion (120) having an inner circumferential surface, wherein the inner circumferential surface includes at least one ridged section (121) and at least one smooth section (122) alternately located on a circumferential path in a cross-section of the tubular portion (120), and wherein each ridged section (121) of the inner circumferential surface includes at least one ridge (123), - wherein the first rod is configured to be inserted into the tubular portion (120) of the connecting member (12) in a state where a cross-sectional projection of the at least one ridged section of the first rod coincides with a cross-sectional projection of the at least one smooth section (122) of the connecting member (12), and - wherein one of the first rod and the connecting member (12) is configured to rotate relative to the other of the first rod and the connecting member (12) so that the corresponding ridges (113, 123) of both the first rod and the connecting member (12) engage; at least one structural element (202); and at least one attachment element (201) disposed on one of the at least one structural element (202), wherein the attachment element (201) has an opening (210) configured to receive the first plug connector (101) or the second plug connector (102) and configured to hold the first plug connector (101) or the second plug connector (102) in the longitudinal direction of the columnar aircraft frame assembly (10) if the received first plug connector (101) or second plug connector (102) rotates a predetermined degree in the opening (210).

9. The aircraft structural frame (20) according to claim 8, wherein, The columnar aircraft frame assembly (10) further includes: a second rod extending from the second plug connector (102) towards the first plug connector (101), wherein the connecting member (12) is coupled to the second plug connector (102) by being detachably coupled to the second rod, The opening (210) includes a first section (211) extending from an outer surface (214) towards the structural element (202) in an insertion direction, the first section (211) having a cross-sectional shape corresponding to a circumferential profile of the first plug connector (101) or the second plug connector (102), the cross-sectional shape including at least one protrusion (213) protruding in a direction perpendicular to the insertion direction, and wherein the opening (210) includes a second section (212) further extending from the first section (211) in the insertion direction, the second section (212) having a circular or square cross-sectional shape having a cross-sectional extension range of at least the widest part of the first section (211), and Wherein the first plug connector (101) or the second plug connector (102) includes a first section (118) extending along the longitudinal direction of the corresponding first rod or second rod, the first section (118) of the first plug connector (101) or the first section (118) of the second plug connector (102) having a circular or square cross-sectional shape corresponding to the minimum cross-sectional dimension of the first section (211) of the opening (210), and wherein the first plug connector (101) or the second plug connector (102) includes a second section (119) extending further along the longitudinal direction from the first section (118), the second section (119) having an irregular circumferential profile forming at least one fastening element (114).

10. The aircraft structural frame (20) according to claim 9, wherein the longitudinal extent of the first section (118) of the first plug connector (101) or the longitudinal extent of the first section (118) of the second plug connector (102) is at least the longitudinal extent of the first section (211) of the opening (210), and wherein the longitudinal extent of the second section (212) of the opening (210) is at least the longitudinal extent of the second section (119) of the first plug connector (101) or the longitudinal extent of the second section (119) of the second plug connector (102).

11. The aircraft structural frame (20) according to any one of claims 8 to 10, wherein the at least one attachment element (201) is fixed to the one structural element of the at least one structural element (202) by 3D printing.

12. The aircraft structural frame (20) according to any one of claims 8 to 10, wherein the at least one attachment element (201) is made of an alloy.

13. The aircraft structural frame (20) according to any one of claims 8 to 10, further comprising: a structural connector (205) including at least two attachment elements (201), wherein the first plug connector (101) or the second plug connector (102) is received in the first attachment element of the at least two attachment elements (201), and wherein a third plug connector of another columnar aircraft frame assembly (10) according to any one of claims 1 to 7 is received in the second attachment element of the at least two attachment elements (201).

14. The aircraft structural frame (20) according to claim 13, wherein the structural connector (205) is configured to have a fixed or variable angle between the respective insertion directions of the at least two attachment elements (201).

15. The aircraft structural frame (20) according to claim 11, wherein the at least one attachment element (201) is fixed to the one structural element of the at least one structural element (202) by an FTM printing method.

16. The aircraft structural frame (20) according to claim 12, wherein the at least one attachment element (201) is made of AlMgSc.

17. An aircraft (100) comprising at least one aircraft structural frame (20) according to any one of claims 8 to 16.

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