Mechanical fastening system and related structural components and methods

Abstract

The present application relates to mechanical fastening systems and related structural assemblies and methods. A structural assembly includes: a first structural member defining a first partial hole and including a first protrusion and a second protrusion; a second structural member defining a second partial hole and including a first protrusion and a second protrusion, wherein the second partial hole is aligned with the first partial hole to define a through hole; a shaft extending through the through hole, wherein the shaft includes a first end and a second end; a first engaging member proximate to the first end, wherein the first engaging member engages both the first protrusion of the first structural member and the first protrusion of the second structural member; and a second engaging member proximate to the second end, wherein the second engaging member engages both the second protrusion of the first structural member and the second protrusion of the second structural member.

Description

Technical Field

[0001] The present application relates to the connection of structural members, and more particularly, to a mechanical fastening system for connecting one structural member to one or more other structural members. Background Art

[0002] The wings of an aircraft are generally composed of ribs, spars, and skin panels (e.g., upper skin panels and lower skin panels). Specifically, the ribs are spaced apart from each other along the length of the wing. The front end of the rib is connected to the front spars, and the rear end of the rib is connected to the rear spars. The upper skin panel is connected to the upper portion of each rib, and the lower skin panel is connected to the lower portion of each rib.

[0003] Thus, the ribs, spars and skin panels define a closed wing box which, for some aircraft, can be used as a tank for fuel storage purposes. Once the wing box is closed, any work that must be done in the wing requires personnel to enter the confined space. Therefore, various safety precautions must be taken, which increases the overall cost of aircraft manufacturing.

[0004] To avoid the limited space problem, a split wing design was developed. As an example, a two-piece wing box is used, where an upper skin panel is connected to an upper wing box section, and a lower skin panel is connected to a lower wing box section. Thus, the wing box can be opened for work or inspection, and then closed by connecting the upper wing box section to the lower wing box section. However, the process of aligning and connecting the upper and lower wing box sections is time consuming, and the fasteners used significantly increase the weight of the aircraft.

[0005] Therefore, those skilled in the art continue to conduct research and development work on the connection of structural members. Summary of the invention

[0006] A structural component is disclosed. In one example, the disclosed structural component includes: a first structural member having a first side and a second side opposite to the first side, and defining a first partial hole extending from the first side to the second side, the first structural member further including a first protrusion and a second protrusion, the first protrusion extending on the first side of the first structural member near the periphery of the first partial hole, and the second protrusion extending on the second side of the first structural member near the periphery of the first partial hole; a second structural member including a first side and a second side opposite to the first side, and defining a second partial hole extending from the first side to the second side, the second structural member further including a first protrusion and a second protrusion, the first protrusion extending on the second side of the first structural member near the periphery of the first partial hole a first protrusion extending from a first side of the second structural member near the periphery of the second partial hole, a second protrusion extending from a second side of the second structural member near the periphery of the second partial hole, wherein the second partial hole is aligned with the first partial hole along the hole axis to define a through hole; a shaft extending through the through hole, wherein the shaft includes a first end and a second end longitudinally opposite to the first end; a first engaging member, near the first end, wherein the first engaging member engages both the first protrusion of the first structural member and the first protrusion of the second structural member; and a second engaging member, near the second end, wherein the second engaging member engages both the second protrusion of the first structural member and the second protrusion of the second structural member.

[0007] In another example, the disclosed structural assembly includes: a first structural member having a first side and a second side opposite to the first side, and defining a first partial hole extending from the first side to the second side, the first structural member further including a first protrusion and a second protrusion, the first protrusion protruding near the periphery of the first partial hole on the first side of the first structural member, and the second protrusion protruding near the periphery of the first partial hole on the second side of the first structural member; a second structural member including a first side and a second side opposite to the first side, and defining a second partial hole extending from the first side to the second side, the second structural member further including a first protrusion and a second protrusion, the first protrusion protruding near the periphery of the second partial hole on the first side of the second structural member, and the second protrusion protruding near the periphery of the second partial hole on the second side of the second structural member, wherein the second partial hole is aligned with the first partial hole along the hole axis to define a through hole; a first engaging member engaging with both the first protrusion of the first structural member and the first protrusion of the second structural member; and a second engaging member engaging with both the second protrusion of the first structural member and the second protrusion of the second structural member, wherein the first structural member and the second structural member are clamped between the first engaging member and the second engaging member.

[0008] A method for connecting a first structural member to a second structural member is also disclosed, each of the first structural member and the second structural member including a first side, a second side opposite the first side, a partial hole extending from the first side to the second side, a first protrusion extending near the periphery of the partial hole on the first side, and a second protrusion extending near the periphery of the partial hole on the second side. In one example, the disclosed method may include the following steps: (1) aligning the partial hole of the first structural member with the partial hole of the second structural member along the hole axis to define a through hole; (2) positioning a first engaging member to engage with both the first protrusion of the first structural member and the first protrusion of the second structural member; and (3) positioning a second engaging member to engage with both the second protrusion of the first structural member and the second protrusion of the second structural member.

[0009] In another example, the disclosed method may include the following steps: (1) aligning a partial hole of a first structural member with a partial hole of a second structural member along a hole axis to define a through hole; (2) positioning a first engaging member to engage with both a first protrusion of the first structural member and a first protrusion of the second structural member; (3) positioning a second engaging member to engage with both a second protrusion of the first structural member and a second protrusion of the second structural member; and (4) applying a clamping force to the first engaging member and the second engaging member to clamp the first structural member and the second structural member between the first engaging member and the second engaging member.

[0010] Other examples of the disclosed mechanical fastening systems and related structural assemblies and methods will become apparent from the following detailed description, drawings, and appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic perspective view of an example aircraft incorporating the disclosed mechanical fastening system;

[0012] Figure 2 yes Figure 1 a partially exploded side sectional view of a portion of a wing of an aircraft;

[0013] Figure 3A and Figure 3B is an exploded perspective view of one example of the disclosed mechanical fastening system;

[0014] Figure 4 is through Figure 3A and Figure 3B A side elevation view of two structural members connected by a mechanical fastening system;

[0015] Figure 5 is a side perspective view of an example of the disclosed structural assembly, which can be Figure 4 The structural components and Figure 3A and Figure 3B The mechanical fastening system is connected to form;

[0016] Figure 6 yes Figure 5 a cross-sectional view of a structural component;

[0017] Figure 7 is a cross-sectional view of another example of the disclosed structural assembly;

[0018] Figure 8 is a cross-sectional view of yet another example of the disclosed structural assembly;

[0019] Fig. 9 is a flow chart depicting an example of the disclosed connection method;

[0020] Fig.10 is a cross-sectional view of an example of the disclosed structural assembly secured by a one-piece threaded mechanical fastening system;

[0021] Fig.11 is a cross-sectional view of an example of the disclosed structural assembly secured by another one-piece threaded mechanical fastening system;

[0022] Fig.12 is a cross-sectional view of one example of the disclosed structural assembly secured by yet another one-piece threaded mechanical fastening system;

[0023] Fig.13 is a cross-sectional view of an example of the disclosed structural assembly secured by a mechanical fastening system that secures the joined members using mechanical deformation;

[0024] Fig.14 is a cross-sectional view of an example of the disclosed structural assembly secured by another mechanical fastening system that secures the engaging members using mechanical deformation;

[0025] Fig.15 is a cross-sectional view of an example of the disclosed structural assembly secured by yet another mechanical fastening system that secures the engaging members using mechanical deformation;

[0026] Fig.16 is a cross-sectional view of an example of the disclosed structural assembly secured by a mechanical fastening system that directly secures the structural assembly using mechanical deformation;

[0027] Fig.17 is a cross-sectional view of an example of the disclosed structural assembly secured by another mechanical fastening system that uses mechanical deformation to directly secure the structural assembly;

[0028] Fig.18is a cross-sectional view of an example of the disclosed structural assembly secured by yet another mechanical fastening system that uses mechanical deformation to directly secure the structural assembly;

[0029] Fig.19 is an exploded perspective view of one example of the disclosed mechanical fastening system directly connected to a shaft;

[0030] Fig. 20 is a rear exploded perspective view of one example of the disclosed mechanical fastening system; the mechanical fastening system is directly connected to the shaft;

[0031] Fig.21 is a cross-sectional view of one example of the disclosed structural assembly secured by a mechanical fastening system directly connected to a shaft;

[0032] Fig. 22 is a cross-sectional view of one example of the disclosed structural assembly secured by another mechanical fastening system directly connected to a shaft;

[0033] Fig.23 is a cross-sectional view of yet another example of the disclosed structural assembly secured by a mechanical fastening system directly connected to a shaft;

[0034] Fig.24 is an exploded perspective view of one example of the disclosed structural assembly secured by a "click" mechanical fastening system;

[0035] Fig.25 is a cross-sectional view of one example of the disclosed structural assembly secured by a "click" mechanical fastening system;

[0036] Fig.26 is an exploded perspective view of one example of the disclosed structural assembly secured by a plunger mechanical fastening system;

[0037] Fig. 27 is a perspective view of one example of the disclosed structural assembly secured by a plunger mechanical fastening system;

[0038] Fig.28 is a cross-sectional view of an example of the disclosed structural assembly secured by a plunger mechanical fastening system;

[0039] Fig.29 is a flow chart of aircraft manufacturing and maintenance methods; and

[0040] Fig.30 It is a block diagram of an aircraft. DETAILED DESCRIPTION

[0041] The disclosed mechanical fastening system 100 ( Figure 3A and Figure 3B ) can be incorporated into an aircraft, e.g. Figure 1 The fixed-wing aircraft 10 shown, or a rotary-wing aircraft. Various aircraft, including commercial aircraft, personal aircraft, and military aircraft, may benefit from the disclosed mechanical fastening system 100 without departing from the scope of the present disclosure. Various non-aircraft applications, including non-aerospace applications, for the disclosed mechanical fastening system 100 are also contemplated.

[0042] refer to Figure 1 The aircraft 10 may include a fuselage 12, one or more wings 14 ( Figure 1 Two wings 14 are shown, as well as one or more engines 16 ( Figure 1 Two engines 16 are shown in the figure. Each wing 14 of the aircraft 10 may be fixedly connected to the fuselage 12 and may extend outwardly from the fuselage 12. Each engine 16 may be connected to the associated wing 14 (e.g., suspended below it) via a pylon 18.

[0043] refer to Figure 2 Each wing 14 of the aircraft 10 may include a rib 20 (at Figure 2 1 ), a front spar 22, a rear spar 24, a first (e.g., upper) skin portion 26, and a second (e.g., lower) skin portion 28. The rib 20 may include a first (e.g., upper) rib portion 30 and a second (e.g., lower) rib portion 32. The first skin portion 26 may be connected to the first rib portion 30, and the second skin portion 28 may be connected to the second rib portion 32. The first rib portion 30 may be connected to the second rib portion 32 using the disclosed mechanical fastening system 100 to form an assembled rib 20.

[0044] A forward end 34 of the rib 20 may be connected to the front spar 22, for example, using mechanical fasteners 36, and a rearward end 38 of the rib 20 may be connected to the rear spar 24, for example, using mechanical fasteners 40. Additionally, a forward control surface 42 (e.g., a slat) may be connected to the front spar 22, and a rearward control surface 44 (e.g., an aileron) may be connected to the rear spar 24. Thus, the wing 14 may include a wing box 46 defined by the rib 20, the forward and rearward control surfaces 42, 44, and the first and second skin portions 26, 28.

[0045] like Figure 2As shown, the wing 14 may be opened by separating the first rib portion 30 and the associated first skin portion 26 from the wing box 46. Such separation may be achieved by separating the first rib portion 30 from the second rib portion 32 with the aid of the disclosed mechanical fastening system 100. Then, once any work and / or inspection within the wing 14 is completed, the wing 14 may be closed by connecting the first rib portion 30 (and the associated first skin portion 26) to the second rib portion 32 via the disclosed mechanical fastening system 100.

[0046] refer to Figure 3A and Figure 3B , one example of the disclosed mechanical fastening system, generally designated 100, may include a first engagement member 102, a second engagement member 104, and a clamping assembly 106. The first engagement member 102 may be aligned with the second engagement member 104 along a longitudinal axis A. The clamping assembly 106 may engage with both the first engagement member 102 and the second engagement member 104 to axially (along the longitudinal axis A) urge the first engagement member 102 toward the second engagement member 104 to facilitate clamping a structural member therebetween, as described in greater detail herein.

[0047] exist Figure 3A and Figure 3B In the example of , the clamping assembly 106 may include a bolt member 110 and a nut member 112. The bolt member 110 may engage the first engagement member 102. The nut member 112 may engage the second engagement member 104 and may be threadedly engaged with the bolt member 110. Therefore, by screwing the nut member 112 onto the bolt member 110, the first engagement member 102 may be axially pushed toward the second engagement member 104.

[0048] Specifically, the bolt member 110 of the clamp assembly 106 may include a shaft 114 elongated along a longitudinal axis A and including a first end 116 and a second end 118 longitudinally opposite the first end 116. The shaft 114 of the bolt member 110 may optionally define a bolt member through hole 120 extending from the first end 116 to the second end 118. Although optional, using a bolt member 110 having a bolt member through hole 120 may reduce the overall weight of the mechanical fastening system 100 and may provide a route (bolt member through hole 120) for routing wires, hoses, pipes, etc.

[0049] The first engagement member 102 of the disclosed mechanical fastening system 100 may be fixedly connected to a first end 116 of a shaft 114 of a bolt member 110 of a clamping assembly 106. For example, Figure 3A and Figure 3BAs shown, the first engagement member 102 can be integral with the first end 116 of the shaft 114 of the bolt member 110 (e.g., the bolt member 110 and the first engagement member 102 can be formed as a single integral body). When the bolt member 110 has a bolt member through hole 120, the first engagement member 102 can be generally annular so as not to block the bolt member through hole 120.

[0050] The threads 122 may extend along the shaft 114 of the bolt member 110 from the second end 118 of the shaft 114 toward the first end 116. The nut member 112 may be provided with corresponding threads 124 and may be screwed onto the shaft 114 of the bolt member 110. Thus, when the second engagement member 104 of the disclosed mechanical fastening system 100 is coaxially received on the shaft 114 of the bolt member 110 (similar to a washer), the process of screwing the nut member 112 onto the bolt member 110 may cause the nut member 112 to abut against the second engagement member 104, thereby urging the second engagement member 104 along the shaft 114 toward the first engagement member 102.

[0051] Although the clamping assembly 106 is shown and described as utilizing a threaded engagement, it is contemplated that clamping assemblies utilizing various techniques other than threads (e.g., toothing) may be utilized to achieve approximation of the first engagement member 102 and the second engagement member 104. The use of a non-thread-based clamping assembly would not result in a departure from the scope of the present disclosure.

[0052] like Figure 3A As shown, the first engagement member 102 of the disclosed mechanical fastening system 100 may define a recess 130 extending axially into the first engagement member 102 and opening toward the second engagement member 104. In one particular configuration, the first engagement member 102 may include an annular body 132 having an annular surface 134, and the recess 130 may be a groove 136 extending circumferentially along the annular surface 134. Although the groove 136 is Figure 3A 1 and 2. Although shown as continuous in FIG. 1, it is also contemplated that the groove 136 may be discontinuous (eg, comprised of two or more spaced-apart groove segments).

[0053] Although the engagement members 102, 104 are shown in the figures as having an annular body 132 with an annular surface 134, engagement members 102, 104 having various other shapes and configurations may be used to achieve the same function as the illustrated engagement members 102, 104. Variations in engagement member shapes will not result in a departure from the scope of the present disclosure.

[0054] like Figure 3BAs shown, the second engagement member 104 of the disclosed mechanical fastening system 100 may define a recess 140 extending axially into the second engagement member 104 and opening toward the first engagement member 102. In one particular configuration, the second engagement member 104 may include an annular body 142 having an annular surface 144, and the recess 140 may be a groove 146 extending circumferentially along the annular surface 144. Although the groove 146 is Figure 3B As shown as continuous, it is also contemplated that the groove 146 may be discontinuous (eg, comprised of two or more spaced apart groove segments).

[0055] The mechanical fastening system 100 can be assembled by positioning the second engagement member 104 on the shaft 114 of the bolt member 110 and threading the nut component 112 onto the bolt member 110. Once assembled, the first engagement member 102 can be axially aligned with the second engagement member 104 such that the recess 130 (e.g., groove 136) in the first engagement member 102 faces the recess 140 (e.g., groove 146) in the second engagement member 104.

[0056] The disclosed mechanical fastening system 100 can be used to connect two or more structural members 202, 204 ( Figure 4 ) to produce structural component 200 ( Figure 5 and Figure 6 Importantly, once the structural members 202, 204 have been connected to form the structural assembly 200, the structural members 202, 204 may subsequently be separated by the disclosed mechanical fastening system 100 and, if desired, reconnected by the disclosed mechanical fastening system 100.

[0057] refer to Figure 5 and Figure 6 An example of the disclosed structural assembly, generally designated 200, may include a first structural member 202, a second structural member 204, and the disclosed mechanical fastening system 100 (in Figure 5 Five mechanical fastening systems 100 are shown in FIG. 1 . The mechanical fastening systems 100 may connect a first structural member 202 to a second structural member 204 .

[0058] The first structural member 202 of the disclosed structural assembly 200 may include a first side 210 and a second side 212 ( Figure 6 ).like Figure 4 As best shown in FIG. 1 , the first structural member 202 may define a first partial aperture 214 (at Figure 4 2 , two first partial holes 214 are shown, which extend through the first structural member 202 from the first side 210 to the second side 212. The first partial holes 214 have a perimeter 216.

[0059] like Figure 6 , the first protrusion 218 may extend proximate (herein or near) the perimeter 216 of the first partial hole 214 on the first side 210 of the first structural member 202. Similarly, the second protrusion 220 may extend proximate (herein or near) the perimeter 216 of the first partial hole 214 on the second side 212 of the first structural member 202. The first protrusion 218 and the second protrusion 220 of the first structural member 202 may be sized and shaped to be at least partially received within the corresponding recesses 130, 140 of the first and second engaging members 102, 104 of the disclosed mechanical fastening system 100.

[0060] In one particular configuration, the first protrusion 218 of the first structural member 202 can be a first ridge 222, and the first ridge 222 can extend completely or partially along the perimeter 216 of the first partial hole 214. Similarly, the second protrusion 220 of the first structural member 202 can be a second ridge 224, and the second ridge 224 can extend completely or partially along the perimeter 216 of the first partial hole 214. The first ridge 222 and the second ridge 224 of the first structural member 202 can be sized and shaped to be at least partially received within the corresponding grooves 136, 146 of the first engagement member 102 and the second engagement member 104 of the disclosed mechanical fastening system 100. For example, the first ridge 222 and the second ridge 224 can have a circular cross-sectional profile, such as Figure 6 shown.

[0061] Reference again Figure 5 and Figure 6 The second structural member 204 of the disclosed structural assembly 200 may include a first side 230 and a second side 232 ( Figure 6 ).like Figure 4 As best shown in FIG. 1 , the second structural member 204 may define a second partial aperture 234 (at Figure 4 2 , two second partial holes 234 are shown, which extend through the second structural member 204 from the first side 230 to the second side 232. The second partial holes 234 have a perimeter 236.

[0062] like Figure 6, the first protrusion 238 may extend proximate (herein or near) the perimeter 236 of the second partial hole 234 on the first side 230 of the second structural member 204. Similarly, the second protrusion 240 may extend proximate (herein or near) the perimeter 236 of the second partial hole 234 on the second side 232 of the second structural member 204. The first protrusion 238 and the second protrusion 240 of the second structural member 204 may be sized and shaped to be at least partially received within the corresponding recesses 130, 140 of the first and second engaging members 102, 104 of the disclosed mechanical fastening system 100.

[0063] In one particular configuration, the first protrusion 238 of the second structural member 204 can be a third ridge 242, and the third ridge 242 can extend completely or partially along the perimeter 236 of the second partial hole 234. Similarly, the second protrusion 240 of the second structural member 204 can be a fourth ridge 244, and the fourth ridge 244 can extend completely or partially along the perimeter 236 of the second partial hole 234. The third ridge 242 and the fourth ridge 244 of the second structural member 204 can be sized and shaped to be at least partially received within the corresponding grooves 136, 146 of the first and second engaging members 102, 104 of the disclosed mechanical fastening system 100. For example, the third ridge 242 and the fourth ridge 244 can have a circular cross-sectional profile, such as Figure 6 shown.

[0064] In this regard, those skilled in the art will appreciate that the first structural member 202 of the disclosed structural assembly 200 may be an aircraft 10 ( Figure 1 ) of the wing 14( Figure 2 ) of the first rib portion 30 ( Figure 2 ), and the second structural member 204 may be the second rib portion 32, such that the structural assembly 200 is an assembled rib 20. However, this is merely one specific and non-limiting aerospace example. Those skilled in the art will appreciate that a variety of structural members 202, 204 may be connected with the disclosed mechanical fastening system 100, and that the specific size, shape, configuration, and function of the structural members 202, 204 are not limiting. In fact, the disclosed structural assembly 200 may be used in a variety of non-aerospace applications, such as automotive applications, marine applications, and residential / commercial building applications, without departing from the scope of the present disclosure.

[0065] Reference now Figure 6To connect the first structural member 202 to the second structural member 204, the first structural member 202 may be positioned relative to the second structural member 204 such that the first partial hole 214 of the first structural member 202 is substantially aligned with the second partial hole 234 of the second structural member 204 along the hole axis B. Thus, the first structural member 202 and the second structural member 204 may define a through hole 250 including the first partial hole 214 and the second partial hole 234.

[0066] Although a cylindrical through hole 250 is shown, through holes having various shapes may be used without departing from the scope of the present disclosure. The cylindrical through hole 250 is merely one specific, non-limiting example.

[0067] With the through hole 250 defined, the bolt member 110 of the clamp assembly 106 of the disclosed mechanical fastening system 100 may be inserted through the through hole 250, thereby engaging the first engagement member 102 with both the first protrusion 218 of the first structural member 202 and the first protrusion 238 of the second structural member 204. When the first engagement member 102 engages with the first protrusions 218, 238 of the first structural member 202 and the second structural member 204, the first protrusions 218, 238 may be at least partially received within the recess 130 of the first engagement member 102.

[0068] With the bolt member 110 of the clamp assembly 106 of the disclosed mechanical fastening system 100 extending through the through hole 250, the second engagement member 104 may be received on the second end 118 of the bolt member 110. The nut member 112 may then be threaded onto the bolt member 110, thereby bringing the nut member 112 into abutting engagement with the second engagement member 104. When the nut member 112 is threaded onto the bolt member 110, the nut member 112 may urge the second engagement member 104 into engagement with the second protrusion 220 of the first structural member 202 and the second protrusion 240 of the second structural member 204. When the second engagement member 104 is engaged with the second protrusions 220, 240 of the first structural member 202 and the second structural member 202, the second protrusions 220, 240 may be at least partially received within the recess 140 of the second engagement member 104.

[0069] When the nut member 112 of the clamping assembly 106 of the disclosed mechanical fastening system 100 is threaded onto the bolt member 110, the first structural member 202 and the second structural member 204 become clamped between the first engagement member 102 and the second engagement member 104. Because the first engagement member 102 engages with the first protrusions 218, 238 of the first structural member 202 and the second structural member 204, and the second engagement member 104 engages with the second protrusions 220, 240 of the first structural member 202 and the second structural member 204, separation of the first structural member 202 relative to the second structural member 204 is prevented.

[0070] Thus, the disclosed mechanical fastening system 100 can be used to connect two or more structural members 202, 204. The mechanical fastening system 100 can be self-centering, can withstand lateral and tensile loads, and can be at or near weight neutral, particularly when the bolt member 110 includes a bolt member through hole 120.

[0071] refer to Figure 7 In an alternative example, the disclosed structural assembly, generally indicated at 200', may include a first structural member 202', a second structural member 204', and a mechanical fastening system 100'. The mechanical fastening system 100' may include a first engagement member 102', a second engagement member 104', and a clamping assembly 106'. The clamping assembly 106' may be thread-based and may include a bolt member 110', a first nut member 112', and a second nut member 113'. The first nut member 112' may be threadedly engaged with the bolt member 110' and may be in abutting engagement with the first engagement member 102'. The second nut member 113' may be threadedly engaged with the bolt member 110' and may be in abutting engagement with the second engagement member 104'.

[0072] Therefore, for the structural assembly 200', due to the threaded engagement of the first nut member 112' and the second nut member 113' with the bolt assembly 110', the first structural member 202' and the second structural member 204' are clamped between the first engagement member 102' and the second engagement member 104'. Figure 6 ), in the structural assembly 200, the first joint member 102 ( Figure 6 ) is connected to the bolt member 110 ( Figure 6 ) (e.g. integral therewith).

[0073] refer to Figure 8In another alternative example, the disclosed structural assembly, generally indicated at 200", may include a first structural member 202", a second structural member 204", and a mechanical fastening system 100". The mechanical fastening system 100" may include a first engaging member 102", a second engaging member 104", and a clamping assembly 106". The clamping assembly 106" may be thread-based and may include a bolt member 110" and a nut member 112". The bolt member 110" may include a flange 111" that is in abutment engagement with the first engaging member 102". The nut member 112" can be threadedly engaged with the bolt member 110" and can be in abutment engagement with the second engagement member 104". Therefore, by positioning the flange 111" of the bolt member 110" against the first engagement member 102" and screwing the nut member 112" into abutment engagement with the second engagement member 104", the first structural member 202" and the second structural member 204" can be clamped between the first engagement member 102" and the second engagement member 104".

[0074] A method for connecting a first structural member to a second structural member is also disclosed. Each structure may include a first side, a second side opposite the first side, a partial hole extending from the first side to the second side, a first protrusion extending from a perimeter of the partial hole on the first side, and a second protrusion extending from a perimeter of the partial hole on the second side.

[0075] refer to Fig. 9 One example of the disclosed connection method, generally indicated at 300, may begin at block 302 with the step of aligning a partial hole of a first structural member with a partial hole of a second structural member. The partial holes may be aligned along a hole axis to define a through hole.

[0076] At block 304, the first engagement member may be positioned to engage with both the first protrusion of the first structural member and the first protrusion of the second structural member. The first engagement member may define one or more recesses (e.g., circumferential grooves), and the engagement between the first engagement member and the first protrusions of the first structural member and the second structural member may include receiving the first protrusion in the recess of the first engagement member.

[0077] At block 306, the second engagement member may be positioned to engage with both the second protrusion of the first structural member and the second protrusion of the second structural member. The second engagement member may define one or more recesses (e.g., circumferential grooves), and the engagement between the second engagement member and the second protrusions of the first structural member and the second structural member may include receiving the second protrusion in the recess of the second engagement member.

[0078] At block 308, a clamping force may be applied to the first and second engagement members. The clamping force may clamp the first and second structural members between the first and second engagement members. Although a clamping assembly including a bolt member and a nut member is shown and described herein to apply such a clamping force, a person skilled in the art will appreciate that a variety of techniques may be used to apply the clamping force to the first and second engagement members to clamp the first and second structural members between the first and second engagement members.

[0079] refer to Fig.10 In an alternative example, the disclosed structural assembly, generally indicated at 2100, includes a first structural member 1010 and a second structural member 1020. A mechanical fastening system 2110 couples the first structural member 1010 with the second structural member 1020.

[0080] The first structural member 1010 includes a first side 1011 and a second side 1012 opposite to the first side 1011. The first structural member 1010 defines a first partial hole 1015 extending from the first side 1011 to the second side 1012. The first protrusion 1013 protrudes on the first side 1011 of the first structural member 1010 near (at or near) a perimeter 1016 of the first partial hole 1015. The second protrusion 1014 protrudes on the second side 1012 of the first structural member 1010 near a perimeter 1016 of the first partial hole 1015.

[0081] The second structural member 1020 includes a first side 1021 and a second side 1022 opposite to the first side 1021. The second structural member 1020 defines a second partial hole 1025 extending from the first side 1021 to the second side 1022. The first protrusion 1023 protrudes on the first side 1021 of the second structural member 1020 near (at or near) a perimeter 1026 of the second partial hole 1025. The second protrusion 1024 protrudes on the second side 1022 of the second structural member 1020 near a perimeter 1026 of the second partial hole 1025. The second partial hole 1025 is aligned with the first partial hole 1015 along the hole axis B1 to define a through hole 1030.

[0082] The mechanical fastening system 2110 includes a first engaging member 2120, a second engaging member 2130, and a shaft 2140. The shaft 2140 may have a generally circular cross-sectional shape, extend through the through hole 1030, and include a first end 2150 and a second end 2160. The first end 2150 may be provided with a thread 2151 extending along the shaft 2140 toward the second end 2160. The second end 2160 may be integral with the second engaging member 2130 (e.g., the second engaging member 2130 and the second end 2160 of the shaft 2140 may be formed as a single integral body). The first engaging member 2120 may be provided with a thread 2121 corresponding to the thread 2151 on the first end 2150 of the shaft 2140.

[0083] Thus, the first engagement member 2120 may be screwed onto the first end 2150 of the shaft 2140 and caused to engage with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. Furthermore, the threaded engagement between the first engagement member 2120 and the first end 2150 of the shaft 2140 may cause the second engagement member 2130 to engage with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. Thus, the threaded engagement of the first engagement member 2120 with the shaft 2140 may fix the first structural member 1010 relative to the second structural member 1020.

[0084] refer to Fig.11 In another alternative example, the disclosed structural assembly, generally designated 2200, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.10 1020). The mechanical fastening system 2210 couples the first structural member 1010 with the second structural member 1020. The mechanical fastening system 2210 includes a first engaging member 2220, a second engaging member 2230, and a shaft 2240. The shaft 2240 extends through the through hole 1030 and includes a first end 2250 and a second end 2260. The first end 2250 may be provided with a thread 2251 extending along the shaft 2240 toward the second end 2260, and the second end 2260 may be provided with a thread 2261 extending along the shaft 2240 toward the first end 2250. In addition, the first engaging member 2220 may be provided with a thread 2221 corresponding to the thread on the first end 2250, and the second engaging member 2230 may be provided with a thread 2231 corresponding to the thread 2261 on the second end 2260.

[0085] Thus, the first engagement member 2220 may be screwed onto the first end 2250 of the shaft 2240 and caused to engage with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. The second engagement member 2230 may be screwed onto the second end 2260 of the shaft 2240 and caused to engage with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. In this way, the threaded engagement of the first engagement member 2220 and the second engagement member 2230 with the shaft 2240 may fix the first structural member 1010 relative to the second structural member 1020.

[0086] refer to Fig.12 In yet another alternative example, the disclosed structural assembly, generally indicated at 2300, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.10 10). The mechanical fastening system 2310 couples the first structural member 1010 to the second structural member 1020. The mechanical fastening system 2310 includes a first engaging member 2320, a second engaging member 2330, and a shaft 2340. The shaft 2340 extends through the through hole 1030 and includes a first end 2350 and a second end 2360. The first end 2350 may be provided with a thread 2351 extending along the shaft 2340 toward the second end 2360. The first engaging member 2320 may be provided with a thread 2321 corresponding to the thread on the first end 2350. The second end 2360 may include a flange 2370 that is abutted against the second engaging member 2330.

[0087] Thus, the first engagement member 2320 can be screwed onto the first end 2350 of the shaft 2340 and caused to engage with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. In addition, by positioning the flange 2370 against the second engagement member 2330, the threaded engagement between the first engagement member 2320 and the first end 2350 of the shaft 2340 can cause the second engagement member 2330 to engage with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. In this way, the threaded engagement of the first engagement member 2320 with the shaft 2340 can fix the first structural member 1010 relative to the second structural member 1020.

[0088] Reference now Figures 13 to 28 , discloses an alternative example of a non-thread-based mechanical fastening system. However, those skilled in the art will appreciate that various combinations of threaded and non-threaded structures and components may be employed without departing from the scope of the present disclosure.

[0089] refer to Fig.13In an alternative embodiment, the disclosed structural assembly, generally indicated at 3100, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.10 10). The mechanical fastening system 3110 couples the first structural member 1010 to the second structural member 1020. The mechanical fastening system 3110 includes a first engaging member 3120, a second engaging member 3130, and a shaft 3140. The shaft 3140 extends through the through hole 1030 and includes a first end 3150 and a second end 3160. The first end 3150 can be mechanically deformed so that the mechanical deformation portion 3151 extends from the shaft 3140 and abuts against the first engaging member 3120. The second end 3160 can be integral with the second engaging member 3130 (for example, the second engaging member 3130 and the second end 3160 of the shaft 3140 can be formed as a single integral body).

[0090] Therefore, the mechanical deformation part 3151 can cause the first joint member 3120 to engage with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. In addition, the engagement between the mechanical deformation part 3151 and the first joint member 3120 can cause the second joint member 3130 to engage with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. In this way, the engagement of the mechanical deformation part 3151 with the first joint member 3120 can fix the first structural member 1010 relative to the second structural member 1020.

[0091] refer to Fig.14 In another alternative example, the disclosed structural assembly, generally indicated at 3200, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.10 10). The mechanical fastening system 3210 couples the first structural member 1010 to the second structural member 1020. The mechanical fastening system 3210 includes a first engaging member 3220, a second engaging member 3230, and a shaft 3240. The shaft 3240 extends through the through hole 1030 and includes a first end 3250 and a second end 3260. The first end 3250 can be mechanically deformed so that a first mechanical deformation portion 3251 extends from the shaft 3240 and abuts against the first engaging member 3220. The second end 3260 can also be mechanically deformed so that a second mechanical deformation portion 3261 extends from the shaft 3240 and abuts against the second engaging member 3230.

[0092] Thus, the first mechanical deformation portion 3251 can cause the first engaging member 3220 to engage with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. The second mechanical deformation portion 3261 can cause the second engaging member 3230 to engage with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. In this way, the engagement of the first mechanical deformation portion 3251 with the first engaging member 3220 and the engagement of the second mechanical deformation portion 3261 with the second engaging member 3230 can fix the first structural member 1010 relative to the second structural member 1020.

[0093] refer to Fig.15 In yet another alternative example, the disclosed structural assembly, generally indicated at 3300, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.10 10). The mechanical fastening system 3310 couples the first structural member 1010 to the second structural member 1020. The mechanical fastening system 3310 includes a first engaging member 3320, a second engaging member 3330, and a shaft 3340. The shaft 3340 extends through the through hole 1030 and includes a first end 3350 and a second end 3360. The first end 3350 is mechanically deformable so that a mechanically deformed portion 3351 extends from the shaft 3340 and abuts against the first engaging member 3320. The second end 3360 may include a flange 3370 that abuts against the second engaging member 3330.

[0094] Thus, the mechanical deformation portion 3351 can cause the first engagement member 3320 to engage with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. In addition, by positioning the flange 3370 against the second engagement member 3330, the engagement between the mechanical deformation portion 3351 and the first engagement member 3320 can cause the second engagement member 3330 to engage with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. In this way, the engagement of the mechanical deformation portion 3351 with the first engagement member 3320 can fix the first structural member 1010 relative to the second structural member 1020.

[0095] refer to Fig.16 In another alternative example, the disclosed structural assembly, generally indicated at 4100, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.1010). The mechanical fastening system 4110 couples the first structural member 1010 to the second structural member 1020. The mechanical fastening system 4110 includes a first engaging member 4120, a second engaging member 4130, and a shaft 4140. The shaft 4140 extends through the through hole 1030 and includes a first end 4150 and a second end 4160. The first end 4150 can be mechanically deformed so that a mechanically deformed portion is generated that extends from the shaft 4140 and engages both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. This mechanically deformed portion becomes the first engaging member 4120. The second end 4160 can be integral with the second engaging member 4130 (for example, the second engaging member 4130 and the second end 4160 of the shaft 4140 can be formed as a single integral body).

[0096] Thus, by mechanically deforming the first end 4150, the first engaging member 4120 may be generated, thereby causing the first engaging member 4120 to engage with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. In addition, mechanically deforming the first end 4150 may cause the second engaging member 4130 to engage with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. Thus, mechanically deforming the first end 4150 may fix the first structural member 1010 relative to the second structural member 1020.

[0097] refer to Fig.17 In another alternative example, the disclosed structural assembly, generally indicated at 4200, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.10 10). The mechanical fastening system 4210 couples the first structural member 1010 with the second structural member 1020. The mechanical fastening system 4210 includes a first joining member 4220, a second joining member 4230, and a shaft 4240. The shaft 4240 extends through the through hole 1030 and includes a first end 4250 and a second end 4260. The first end 4250 can be mechanically deformed so as to generate a first mechanical deformation portion extending from the shaft 4240 and engaging with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. This first mechanical deformation portion becomes the first joining member 4220. The second end 4260 can also be mechanically deformed so as to generate a second mechanical deformation portion extending from the shaft 4240 and engaging with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. This second mechanical deformation portion becomes the second joining member 4230.

[0098] Thus, by mechanically deforming the first end 4250, a first engaging member 4220 may be generated, thereby causing the first engaging member 4220 to engage with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. In addition, by mechanically deforming the second end 4260, a second engaging member 4230 may be generated, thereby causing the second engaging member 4230 to engage with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. In this way, mechanically deforming the first end 4250 and the second end 4260 may fix the first structural member 1010 relative to the second structural member 1020.

[0099] refer to Fig.18 In yet another alternative example, the disclosed structural assembly, generally indicated at 4300, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.10 10). The mechanical fastening system 4310 couples the first structural member 1010 with the second structural member 1020. The mechanical fastening system 4310 includes a first engaging member 4320, a second engaging member 4330, and a shaft 4340. The shaft 4340 extends through the through hole 1030 and includes a first end 4350 and a second end 4360. The first end 4350 can be mechanically deformed so as to generate a mechanically deformed portion extending from the shaft 4340 and engaging with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. This mechanically deformed portion becomes the first engaging member 4320. The second end 4360 may include a flange 4370 that is adjacently engaged with the second engaging member 4330.

[0100] Thus, by mechanically deforming the first end 4350, a first engaging member 4320 may be created, thereby causing the first engaging member 4320 to engage with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. Furthermore, by positioning the flange 4370 against the second engaging member 4330, mechanically deforming the first end 4350 may cause the second engaging member 4330 to engage with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. Thus, mechanically deforming the first end 4350 may fix the first structural member 1010 relative to the second structural member 1020.

[0101] refer to Figures 13 to 18In the examples described in the drawings, those skilled in the art will appreciate that various methods may be used to produce mechanical deformation, including cold forging, hot forging, indentation, deep drawing, and shearing. Thus, the mechanical deformation may be swaging. Those skilled in the art will also appreciate that other methods of producing mechanical deformation may be used without departing from the scope of the present disclosure.

[0102] refer to Fig.19 , Fig. 20 and Fig.21 In an alternative embodiment, the disclosed structural assembly, generally indicated at 5100, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.10 10). The mechanical fastening system 5110 couples the first structural member 1010 to the second structural member 1020. The mechanical fastening system 5110 includes a first engaging member 5120, a second engaging member 5130, and a shaft 5140. The shaft 5140 extends through the through hole 1030 and includes a first end 5150 and a second end 5160. The first engaging member 5120 can be connected to the first end 5150 of the shaft 5140. This connection 5121 can be at least one of bonding, bonding, and interference fit. The second end 5160 can be integral with the second engaging member 5130 (for example, the second engaging member 5130 and the second end 5160 of the shaft 5140 can be formed as a single integral body).

[0103] Thus, the first structural member 1010 and the second structural member 1020 can be positioned between the first engagement member 5120 and the second engagement member 5130 such that the first engagement member 5120 engages both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020, and the second engagement member 5130 engages both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. Once positioned, the first engagement member 5120 can be connected to the first end 5150 such that the position of the first engagement member 5120 is fixed along the axis 5140. In this way, the connection 5121 between the first engagement member 5120 and the first end 5150 can fix the first structural member 1010 relative to the second structural member 1020.

[0104] refer to Fig. 22 In another alternative example, the disclosed structural assembly, generally indicated at 5200, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.1010). The mechanical fastening system 5210 couples the first structural member 1010 to the second structural member 1020. The mechanical fastening system 5210 includes a first engaging member 5220, a second engaging member 5230, and a shaft 5240. The shaft 5240 extends through the through hole 1030 and includes a first end 5250 and a second end 5260. The first engaging member 5220 can be connected to the first end 5250 of the shaft 5240. This connection 5221 can be at least one of engagement, bonding, and interference fit. The second engaging member 5230 can be connected to the second end 5260 of the shaft 5240. This second connection 5231 can be at least one of engagement, bonding, and interference fit.

[0105] Thus, the first structural member 1010 and the second structural member 1020 can be positioned between the first engagement member 5220 and the second engagement member 5230 such that the first engagement member 5220 engages both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020, and the second engagement member 5230 engages both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. Once positioned, the first engagement member 5220 can be connected to the first end 5250, and the second engagement member 5230 can be connected to the second end 5260 such that the positions of the first engagement member 5220 and the second engagement member 5230 are fixed along the axis 5240. In this way, the connections 5221, 5231 between the first engagement member 5220 and the second engagement member 5230 and the first end 5250 and the second end 5260 can fix the first structural member 1010 relative to the second structural member 1020.

[0106] refer to Fig.23 In yet another alternative example, the disclosed structural assembly, generally indicated at 5300, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.10 10). The mechanical fastening system 5310 couples the first structural member 1010 to the second structural member 1020. The mechanical fastening system 5310 includes a first engaging member 5320, a second engaging member 5330, and a shaft 5340. The shaft 5340 extends through the through hole 1030 and includes a first end 5350 and a second end 5360. The first engaging member 5320 may be connected to the first end 5350 of the shaft 5340. This connection 5321 may be at least one of engagement, bonding, and interference fit. The second end 5360 may include a flange 5370 that is abutted against the second engaging member 5330.

[0107] Thus, by positioning flange 5370 against second engagement member 5330, first structural member 1010 and second structural member 1020 can be positioned between first engagement member 5320 and second engagement member 5330 such that first engagement member 5320 engages both first protrusion 1013 of first structural member 1010 and first protrusion 1023 of second structural member 1020, and second engagement member 5330 engages both second protrusion 1014 of first structural member 1010 and second protrusion 1024 of second structural member 1020. Once positioned, first engagement member 5320 can be connected to first end 5350 such that the position of first engagement member 5320 is fixed along axis 5340. In this way, connection 5321 between first engagement member 5320 and first end 5350 can fix first structural member 1010 relative to second structural member 1020.

[0108] refer to Figures 19 to 23 The examples disclosed in the drawings will be understood by those skilled in the art that there are several suitable methods for connecting the joining member to the shaft. For example, the joining can be produced by welding, simmering, soldering, local heat melting and / or vibration melting. The bonding can be produced using resins, acrylic resins and / or epoxies. The interference fit can be produced by thermal interference fit and / or friction interference fit. Those skilled in the art will also understand that other methods for connection can be used without departing from the scope of the present disclosure.

[0109] refer to Fig.24 and Fig.25 In an alternative embodiment, the disclosed structural assembly, generally indicated at 6100, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.10 10). The mechanical fastening system 6110 couples the first structural member 1010 to the second structural member 1020. The mechanical fastening system 6110 includes a first engaging member 6120, a second engaging member 6130, and a shaft 6140. The shaft 6140 extends through the through hole 1030 and includes a first end 6150 and a second end 6160. The first end 6150 may include a protrusion 6151 that extends radially outward and abuts against the first engaging member 6120. This protrusion 6151 may also be defined by a plurality of discontinuous connecting fingers 6152. The second end 6160 may be integral with the second engaging member 6130 (e.g., the second engaging member 6130 and the second end 6160 of the shaft 6140 may be formed as a single integral body).

[0110] Thus, the first engagement member 6120 can move along the axis 6140 toward the second engagement member 6130 so that it mechanically deforms the connecting finger 6152 of the protrusion 6151 inwardly. Thus, once the first engagement member 6120 has moved past the outermost radial point of the protrusion 6151, the connecting finger 6152 can deform back toward its original configuration so that the protrusion 6151 abuts against the first engagement member 6120 and causes it to engage with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020 (e.g., the first engagement member 6120 "clicks" into place). In addition, the abutting engagement of the protrusion 6151 with the first engagement member 6120 can cause the second engagement member 6130 to engage with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. In this way, the first structural member 1010 can be secured relative to the second structural member 1020 by "clicking" the first engagement member 6120 into place.

[0111] refer to Fig.26 , Fig. 27 and Fig.28 In an alternative embodiment, the disclosed structural assembly, generally indicated at 7100, includes a first structural member 1010 and a second structural member 1020 (eg, Fig.10 1020 ). The mechanical fastening system 7110 couples the first structural member 1010 to the second structural member 1020. The mechanical fastening system 7110 includes a first engaging member 7120, a second engaging member 7130, a shaft 7140, and a plunger 7190. The shaft 7140 extends through the through hole 1030 and includes a first end 7150 and a second end 7160. The first end 7150 can be integral with the first engaging member 7120 (e.g., the first engaging member 7120 and the first end 7150 of the shaft 7140 can be formed as a single integral body). The first engaging member 7120 can also extend radially outward from the shaft 7140 and be defined by a plurality of discontinuous connecting fingers 7121. The second end 7160 can be integral with the second engaging member 7130 (e.g., the second engaging member 7130 and the second end 7160 of the shaft 7140 can be formed as a single integral body). Furthermore, the shaft 7140 can define a throughbore 7180 extending along the length of the shaft 7140. The plunger 7190 can be at least partially received by the throughbore 7180 and can include a protrusion 7191 extending radially outward.

[0112] Therefore, by inserting the plunger 7190 into the through hole 7180 of the shaft, the protrusion 7191 of the plunger 7190 can abuttingly engage the first engagement member 7120, thereby urging the first engagement member 7120 to engage with both the first protrusion 1013 of the first structural member 1010 and the first protrusion 1023 of the second structural member 1020. In addition, the abutting engagement of the protrusion 7191 of the plunger 7190 with the first engagement member 7120 can urge the second engagement member 7130 to engage with both the second protrusion 1014 of the first structural member 1010 and the second protrusion 1024 of the second structural member 1020. In this way, inserting the plunger 7190 into the through hole 7180 of the shaft can fix the first structural member 1010 relative to the second structural member 1020.

[0113] Optionally, the plunger 7190 may further include a flange 7192 that nests adjacent to the second engagement member 7130 .

[0114] exist Figures 10 to 28 The examples disclosed in generally describe mechanical fastening systems having a circular cross-sectional shape. However, the shape of the mechanical fastening system need only generally correspond to the shape of the structural member that the mechanical fastening system is securing, which may be non-circular. Therefore, those skilled in the art will appreciate that mechanical fastening systems having other non-circular cross-sectional shapes may be used without departing from the scope of the present disclosure.

[0115] Available in Fig.29 Aircraft manufacturing and service method 400 is shown and Fig.30 Examples of the present disclosure are described in the context of aircraft 402 as shown. During pre-production, aircraft manufacturing and service method 400 may include specification and design 404 of aircraft 402 and material procurement 406. During production, component / subassembly manufacturing 408 and system integration 410 of aircraft 402 occurs. Aircraft 402 may then go through certification and delivery 412 for entry into service 414. While in service by a customer, aircraft 402 is scheduled for routine maintenance and service 416, which may also include modification, reconfiguration, refurbishment, etc.

[0116] Each process of method 400 may be performed or executed by a system integrator, a third party, and / or an operator (e.g., a customer). For the purposes of this specification, a system integrator may include, but is not limited to, any number of aircraft manufacturers and major system subcontractors; a third party may include, but is not limited to, any number of suppliers, subcontractors, and vendors; and an operator may be an airline, a leasing company, a military entity, a service organization, etc.

[0117] like Fig.30As shown, aircraft 402 produced by example method 400 may include fuselage 418 and interior 422 having plurality of systems 420. Examples of plurality of systems 420 may include one or more of propulsion system 424, electrical system 426, hydraulic system 428, and environmental system 430. Any number of other systems may be included.

[0118] The disclosed mechanical fastening systems and related structural assemblies and methods may be used in any one or more stages of the aircraft manufacturing and service method 400. As an example, components or subassemblies corresponding to component / subassembly manufacturing 408, system integration 410, and / or maintenance and repair 416 may be fabricated or manufactured using the disclosed mechanical fastening systems and related structural assemblies and methods. As another example, the fuselage 418 may be constructed using the disclosed mechanical fastening systems and related structural assemblies and methods. Moreover, one or more apparatus instances, method instances, or a combination thereof may be used during component / subassembly manufacturing 408 and / or system integration 410, for example, by significantly speeding up assembly of the aircraft 402 or reducing the cost of the aircraft 402, such as the fuselage 418 and / or the interior 422. Similarly, one or more system instances, method instances, or a combination thereof may be used while the aircraft 402 is in service (for example and not limited to maintenance and repair 416).

[0119] In addition, the present disclosure includes examples according to the following clauses:

[0120] 1. A structural component comprising:

[0121] a first structural member including a first side and a second side opposite the first side and defining a first partial aperture extending from the first side to the second side;

[0122] a second structural member including a first side and a second side opposite the first side and defining a second partial bore extending from the first side to the second side, wherein the second partial bore is aligned with the first partial bore along a bore axis to define a through bore;

[0123] a shaft extending through the through hole, wherein the shaft includes a first end and a second end longitudinally opposite the first end;

[0124] a first engagement member proximate the first end of the shaft, wherein the first engagement member engages both the first structural member and the second structural member; and

[0125] A second engagement member is proximate the second end of the shaft, wherein the second engagement member engages both the first structural member and the second structural member.

[0126] 2. A structural component comprising:

[0127] A first structural member including a first side and a second side opposite to the first side, and defining a first partial hole extending from the first side to the second side, the first structural member further comprising a first protrusion and a second protrusion, the first protrusion protruding on the first side of the first structural member near the periphery of the first partial hole, and the second protrusion protruding on the second side of the first structural member near the periphery of the first partial hole;

[0128] a second structural member including a first side and a second side opposite to the first side and defining a second partial hole extending from the first side to the second side, the second structural member further comprising a first protrusion and a second protrusion, the first protrusion protruding on the first side of the second structural member near a periphery of the second partial hole, the second protrusion protruding on the second side of the second structural member near the periphery of the second partial hole, wherein the second partial hole is aligned with the first partial hole along a hole axis to define a through hole;

[0129] a shaft extending through the through hole, wherein the shaft includes a first end and a second end longitudinally opposite the first end;

[0130] a first engagement member proximate the first end, wherein the first engagement member engages both the first protrusion of the first structural member and the first protrusion of the second structural member; and

[0131] A second engagement member is proximate the second end, wherein the second engagement member engages both the second protrusion of the first structural member and the second protrusion of the second structural member.

[0132] 3. A structural assembly according to clause 2, wherein the first engagement member is threadedly engaged with the first end portion of the shaft.

[0133] 4. A structural assembly according to clause 2 or 3, wherein the second engagement member is threadedly engaged with the second end portion of the shaft.

[0134] 5. A structural assembly according to clause 2, wherein the first end of the shaft includes a mechanical deformation portion that is in abutting engagement with the first engagement member.

[0135] 6. A structural assembly according to clause 2 or 5, wherein the second end of the shaft includes a mechanical deformation in abutting engagement with the second engagement member.

[0136] 7. A structural assembly according to clause 2, wherein the first engagement member comprises a mechanical deformation portion extending from the first end of the shaft.

[0137] 8. A structural assembly according to clause 7, wherein the second engagement member comprises a mechanical deformation extending from the second end of the shaft.

[0138] 9. A structural assembly according to clause 2, wherein the first engagement member is connected to the first end of the shaft.

[0139] 10. The structural assembly of clause 9, wherein the connection comprises at least one of bonding, adhesive bonding and interference fit.

[0140] 11. A structural assembly according to clause 2 or 9, wherein the second joining member is connected to the second end.

[0141] 12. A structural assembly according to clause 2, wherein the shaft includes a flange in abutting engagement with the first engagement member.

[0142] 13. A structural assembly according to clause 2, wherein the first engagement member is integral with the shaft.

[0143] 14. The structural assembly of clause 2, wherein the shaft defines a through hole extending along the length of the shaft.

[0144] 15. The structural assembly of clause 2, wherein the shaft further comprises a protrusion extending radially outwardly from the first end of the shaft, wherein the protrusion is in abutting engagement with the first engagement member.

[0145] 16. A structural assembly according to clause 15, wherein the protrusion is defined by a plurality of discrete connecting fingers.

[0146] 17. A structural assembly according to clause 2, wherein the first engagement member is integral with the first end of the shaft and projects radially outwardly from the shaft.

[0147] 18. A structural assembly according to clause 17, wherein the first joining member is defined by a plurality of discrete connecting fingers.

[0148] 19. A structural assembly according to clause 17 or 18, wherein:

[0149] The shaft defines a through hole extending along the length of the shaft, and

[0150] The structural assembly also includes a plunger at least partially received in the throughbore of the shaft.

[0151] 20. The structural assembly of clause 19, wherein the plunger includes a protrusion extending radially outward from the plunger, and wherein the protrusion pushes the first engagement member radially outward.

[0152] The disclosed mechanical fastening systems and related structural assemblies and methods are described in the context of aircraft; however, one of ordinary skill in the art will readily recognize that the disclosed mechanical fastening systems and related structural assemblies and methods can be used in a variety of applications. For example, the disclosed mechanical fastening systems and related structural assemblies and methods can be implemented in various types of vehicles, such as helicopters, passenger ships, automobiles, etc.

[0153] Although various examples of the disclosed mechanical fastening system and related structural assemblies and methods have been shown and described, modifications may occur to those skilled in the art upon reading the specification. The present application includes such modifications and is limited only by the scope of the claims.

Claims

1. A structural assembly (200) having a mechanical fastening system, the structural assembly comprising: a first structural member, the first structural member including a first side and a second side opposite to the first side and defining a first partial hole extending from the first side to the second side, the first structural member further comprising a first protrusion and a second protrusion, the first protrusion of the first structural member protruding on the first side of the first structural member near the periphery of the first partial hole, and the second protrusion of the first structural member protruding on the second side of the first structural member near the periphery of the first partial hole; a second structural member, the second structural member including a first side and a second side opposite to the first side and defining a second partial hole extending from the first side to the second side, the second structural member further comprising a first protrusion and a second protrusion, the first protrusion of the second structural member protruding on the first side of the second structural member near the periphery of the second partial hole, the second protrusion of the second structural member protruding on the second side of the second structural member near the periphery of the second partial hole, wherein the second partial hole is aligned with the first partial hole along a hole axis to define a through hole; and A mechanical fastening system comprising: a shaft, a first engagement member, a second engagement member and a plunger, The shaft extends through the through hole, wherein the shaft includes a first end and a second end longitudinally opposite the first end; the first engagement member being proximate to the first end, wherein the first engagement member engages both the first protrusion of the first structural member and the first protrusion of the second structural member; and the second engagement member being proximate the second end, wherein the second engagement member engages both the second protrusion of the first structural member and the second protrusion of the second structural member; wherein the first engagement member (7120) is integral with the first end (7150) of the shaft (7140) and extends radially outwardly from the shaft, and wherein the first engagement member is defined by a plurality of discontinuous connecting fingers (7121); wherein: the shaft (7140) defines a through hole (1030) extending along the length of the shaft (7140); and The plunger (7190) is at least partially received in the through hole of the shaft; wherein the plunger includes a protrusion (7191) extending radially outward from the plunger, and wherein the protrusion pushes the first engagement member (7120) radially outward.

2. The structural assembly (200) according to claim 1, wherein: The first engagement member (2120) is threadably engaged with the first end portion (2150) of the shaft (2140).

3. The structural assembly (200) according to claim 1 or 2, wherein: The second engagement member (2130) is threadably engaged with the second end portion (2160) of the shaft (2140).

4. The structural assembly (200) according to claim 1, wherein: The first end portion (3150) of the shaft (3140) includes a mechanical deformation portion (3151) that is in abutting engagement with the first engagement member (3120).

5. The structural assembly (200) according to claim 1 or 4, wherein: The second end portion (3160) of the shaft (3140) includes a mechanical deformation portion (3151) that is in abutting engagement with the second engagement member (3130).

6. The structural assembly (200) according to claim 1, wherein: The first engaging member (3120) comprises a mechanical deformation portion (3151) extending from the first end portion (3150) of the shaft (3140), and wherein the second engaging member (3130) comprises a mechanical deformation portion extending from the second end portion (3160) of the shaft.

7. The structural assembly (200) according to claim 1, wherein: The first engagement member (5120, 5220, 5320) is connected to the first end (5150, 5250, 5350) of the shaft (5140, 5240, 5340).

8. The structural assembly (200) according to claim 7, wherein: The connection includes at least one of joining, bonding and interference fit.

9. The structural assembly (200) according to claim 1 or 7, wherein: The second engaging member (5130, 5230, 5330) is connected to the second end portion (5160, 5260, 5360).

10. The structural assembly (200) according to claim 1, wherein: The shaft (2340) includes a flange (2370) that abuts against the first engagement member (2320).

11. The structural assembly (200) according to claim 1, wherein: The first engagement member (102) is integral with the shaft (114).

12. The structural assembly (200) according to claim 1, wherein: The shaft defines a throughbore extending along a length of the shaft.

13. The structural assembly (200) according to claim 1, wherein: The shaft (6140) further includes a protrusion (6151) extending radially outward from the first end (6150) of the shaft, wherein the protrusion is in abutting engagement with the first engagement member (6120), and wherein the protrusion is defined by a plurality of discontinuous connecting fingers (6152).

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