Патент USA US2405643код для вставки
A. 13, 39*"; 2,405,643 A, CRQT STRUCTURAL coNNEdToR Filed Feb. 7, 1944 // / \—K\ '\ W/ // / ///I V/ [A ./ 7‘ 7 IN VEN TOR. ANDRE’ EH47?’ ‘AGENT '. 2,405,643‘ F'atented Aug. 13, _1 946 uNiTEo STATES PATENT orrlcs 2,405,643 ' STRUCTURAL CONNECTOR André Crot, Los Angeles, Calif., assignor to Lock-J heed Aircraft Corporation, Burbank, Calif. Application February 7, 1944, Serial No. 521,477 6 Claims. 1 (Cl.'189-—-36) . This invention relates‘to structural connections, and relates more particularly to connectors for aircraft structures and other assemblies. It has long been the general practice to employ rivets, screws and welding to connect airplane parts and components. At points where it is nec . disconnection by vibration, but may be inten ~ tionally released with ease'when it is desired to remove or disconnect the associated parts or sec tions. This feature of the invention particularly adapts the connectors for use with closures, pan essary to service or inspect instrumentalities els or sections that are intended to be removed for the purpose of inspecting or servicing elements Within the assembly. rivets or screws, or the making of numerous welds is laborious, expensive and time consuming. Fur assembly, necessitating the employment of blind rivets, plate nuts, and the like. Where removable 2 bled or made up and are not subject to failure or within the aircraft assembly it is the practice to provide access openings and to equip such open ings with closures secured in place by releasable fasteners. The installation of multiplicities of thermore, there are many situations where the joints are inaccessible, at least at one side of the . nection of the assembled parts or sections. The connectors are strong and. positive when assem is ‘panels; closures, etc, are used, numerous releas able fastening devices are required and consider ‘ Other objects and features of the invention will be readily understood from the following detailed description of typical preferred forms of the in vention wherein reference Will be made to the accompanying drawing in which, Figure 1 is a fragmentary perspective view of a typical aircraft assembly of the type in which connectors of the invention may be utilized; Figure 2 is an enlarged transverse detailed sec able expense is involved in the installation. It is a general object of the present invention to provide simple, dependable structural connec tional view of one form of joint or connection of tors for use in aircraft asemblies, and other struc an assembly; tures where preformed or prefabricated compo Figure 3 is a fragmentary longitudinal detailed sectional view taken substantially as indicated by line 3-3 on Figure 2; Figure 4 is a view similar to Figure 2 illustrat ing another‘form of connector of the invention; nents are to be assembled, that obviates the ne cessity for employing rivets, screws and welds in the ?nal assembling of the parts, sections or com ponents. The joints or connecting devices of the invention eliminate the need for rivets, screws, and the like, in ?nally connecting the sections or components of the assembly and make it unnec essary to employ blind rivets, plate nuts or similar expedients in situations where the joints are in accessible or inaccessible in part. Another object of the invention is to'provide structural connectors of the character referred to that are strong and dependable and positively connect the parts, sections or components of the assembly. The connectors are designed to effec tively resist longitudinal shear as well as forces 40 acting in all other directions ‘and have a strength equal to or greater than the parts or components which they connect. ' the invention showing it associated with parts of Figure 5 is a fragmentary longitudinal detailed sectional view taken as indicated by line 5—-5 on Figure 4 but showing the lock strip before it is locked; and, ' Figure 6 is a view similar to Figure 2 illustrat ing still another embodiment of the invention. The joints or connectors of the invention are suitable for use in many different situations and in‘ structures varying greatly in character. Fur thermore, the invention is capable of substantial modi?cation to adapt the connectors for given purposes and for use in given assemblies. I will herein describe the invention as employed in air craft structures, it being understood that this is merely a typical application and is not to be con Another'object of the invention is to provide strued as limiting either the scope or the utility of ' structural'connectors of the character mentioned 45 the invention. In Figure 1 of the drawing I have illustrated a that may be easily and quickly assembled with out special tools or equipment. portion of an aircraft boom 0r fuselage compris ing two sections S adapted to be connected by a A further object of ‘the‘invention is to provide joint‘ structure or connector of the invention. connectors of the general class referred’ to which present smooth flush or substantially ?ush sur 50 Furthermore, the individual sections 5 are sub faces at the joints and avoid all irregularities at stantially cylindrical tubular elements and their. the joints. axial seams or joints Ill may be provided with A still further object of the invention is to selected connectors of the invention. It is to be provide structural connectors of the class referred understood that the airplane assembly of Figure toy that may be quickly released to permit discon 55. 1‘ is merely typical of many structures in which ' ‘2,405,643 3 4 theconnectors of the invention may be employed into the required assembled positions. and the invention is not to be considered as lim be seen that when the serrations II are in full mesh the connector is capable of assuming ex ited for use on tubular assemblies or assemblies of any particular con?guration. Figures 2 and 3 of the drawing illustrate a typical preferred form of connector of the inven tion which comprises two members II formed to have locking cooperation one with the other, and a lock strip'IZ for holding the members H in the interlocking relation. ' The members I I are intended to be secured to the edge portions of the components or sec tions A which are to be connected. In the draw ing, the adjacent edge portions of the sections A are ?at, it being understood that the con It will tremely heavy longitudinal shear loads. The lock strip I2 is provided to retain the mem bers II in the positions where their serrations H are in full mesh and further serves to lock or hold the members II against relative trans verse movement or displacement. The lock strip I2 is channel shaped or substantially U-shaped in transverse cross section having two spaced side parts I 8. The strip I2 is shaped and propor tioned to engage around the interlocking ?anges ' I4 and its side parts I8 are shaped to cooperate with the ?anges. Enlargements or bulbs I9 are provided on the inner surfaces of the side parts or contoured. The members I I are alike or com I8 and present convex rounded shoulders 20 for plementary and where. the connector is to be cooperating with the shoulders I6 of the ?anges employed in an aircraft assembly the members - I4. The ?anges I4 have curved concave external II may be formed of a suitable aluminum alloy. 20 surfaces adapted to receive the bulbs I9 to allow Inpractice the members II may-be extruded ' full engagement of the shoulders 20 with the sections of aluminum alloy or the like. The shoulders I8. When the sections A have been members I I resemble angle sections and have brought to the relationship where the serrations broad or extensive ?anges I3 and inturned I‘! are in meshing engagement, the lock strip I2 ?anges I4 of less extent. The ?anges l3 are is slid onto the ?anges I4 to bring the shoulders intended to be attached to their respective com 20_ into engagement with the shoulders I6. This ponents or sections A of the assembly. The looks the connector so that the sections A are ?anges I3 may ?atly or evenly engage the inner positively connected against relative movement surfaces of the sections A and may bejcontoured and displacement in all directions. The Walls of to .conform to contoured sections, although in 30 the trough or channel 2I in the lock strip I2 most cases the ?anges I3 are sufficiently ?exible are shaped to conform to or readily receive the to readily conform to such contoured sections. bulbed edges of the ?anges I4. The lock strip In accordance with the invention, the ?anges I2 may be proportioned to extend throughout I3 are permanently secured to the sections A the entire length of the joint and is preferably tobe rigid therewith. The ?anges I3 may be 85 uniform in transverse con?guration to have even engagement with the ?anges I4. attached to the sections A by rivets 9, screws, spot welds, or roll welds. It is usually preferred Means may be provided to prevent longitudi to positively secure the ?anges I3 to their respec nal displacement or movement of the lock strip tive sections A throughout the lengths of the I2. This means may comprise a pin or screw ?anges. . 40 22 engaged in openings in the strip I2 and a The inturned ?anges .I4 of the members II are The pin or screw 22 is preferably in the nature of rims .or beads which prefer adjacent one end of the connector to be acces ably extend throughout the entire lengths of the sible. There is little or no tendency for the lock members. The ?anges I4 extend along the inner strip I2 to move longitudinally and the screw or opposing edges of the ?anges I3 and are thick 45 22 is not required in all installations. In some ened to have bulbs I5 which present convex instances a holding means for the lock strip I2 surfaces or shoulders I6 at what I will term the is entirely unnecessary. For example, in some rear faces of the ?anges I4. The inner and structures elements of the assembly may engage outer corners of the-?anges 14 are also prefer the opposite ends of the lock strip I2 to hold ably rounded about suitable radii. In the pre 50 it against endwlse movement. ferred construction the forward sides or faces of In situations where the joint or connector is the ?anges M are formed to have looking or subject to heavy transverse shear loads it may meshing cooperation to assume the longitudinal be desired to employ a, key 23 to assist in assum shear forces to which the assembly may be sub ing such loads. Where the key 23 is to be used, jected. Multiplicities of teeth or serrations I‘! 55 partially cylindrical longitudinal grooves 24 are are provided on the forward faces of the ?anges provided in the serrated forward faces of the I4. The serrations I‘! may be of any selected ?anges I4. The grooves 24 oppose one another cross sectional con?guration. It is usually pre and register to constitute a cylindrical opening ferred to employ serrations I‘! of V-shaped cross for receiving the cylindrical key 23. 'The key 23 section, as illustrated in Figure 3, to provide 60 is passed or slid into this opening from one end maximum contact and to assure. full uniform of the assembly. It will be seen that the key mating of the serrations. The series of serrations 23 engaged in the grooves 24 is capable of as I‘! may extend throughout the entire length of suming heavy transverse shear loads that may the connector and may be of substantial Width. be imposed on the assembly. The key 23 is op In forming the serrations the ?anges‘ I3 of the 65 tional and is not required in all cases. Where two members may be arranged. in back-to-back the :key 23 is not used the channel shaped lock strip I2 conforming to the ?anges I2 and the relation, and the two members then may be simultaneously passed through a roll machine to bulbs I5 thereon positively prevents relative form identical serrations I’! in the faces of the transverse displacement of the assembled sec tow ?anges I4. This mode of forming the ser 70 tions A and dependably assumes transverse shear rations I'I assures perfect mating or cooperation loads. ‘Furthermore, the lock strip I4 engaging of the serrations when the connector is assem about the ?anges I4 prevents separation of the bled. The members ,II are attached to the sec sections and dependably transmits and assumes tions A to be in the relationship where their ser tension to ‘which the assembly may be subjected. rations mesh when the sections A are brought 75 From the ‘above it will be seen that the con nector may be used with sections that are curved 2,4053%’, 5 g 6 nector illustrated in Figures 2 and 3 is easily made ‘ up or assembled to positively ‘connect the'sections A of the structure. The sections A may be pre fabricated to have the members I! secured to their edge portions and in making up the connec tion the sections A are ?rst brought to the posi tions where the serrations ll mesh. Where the signed to engage iaboutthe ?ange parts 35 to" assembling operations. are provided‘ on the side partst‘ia and engage under or interlock with the bulbs 36 of the ?ange hold them in the relationship where their serra tions 31.1are in complete mesh. 'Wherethe con nector parts'are formed of aluminum alloy, or the like, the strip 3| maybe an extruded section. The strip 3| is channel shaped in transverse cross section having two spaced generally parallel side key 23 is employed, the key is then inserted into parts 31*’ and a connecting portion 38. The side theregistering grooves 23 and the lock strip I2 parts 3% are proportioned to ?t within the is slid over the ?anges M. This completes the 10 troughs of the J-shaped ?anges 2M. Bulbs 39 The mating serrations - I‘! are capable of assuming very heavy longitudi nal shear loads and the key 23 and lock strip. l2 engaged with the ?ange parts [4 dependabjly hold the connected sections. against relative movement in all other directions. parts 35-. Figure 4 clearly illustrates the manner in which the bulbs 36 and 39‘engage or interlock, to retain the members 30 and their sectionsB in the correctly assembled relationship. It will be The connec tion- is strong and positive and will not work loose under any vconditions of operation orv usage. When it is desired to disconnect the sections A, the lock strip 12 is merely slid from the ?anges l4, and where the key 23 is employed the key is withdrawn from the grooves 23. This frees the sections A for disconnection.v The connector i1‘ lustrated in detail in Figures 2 and 3 is used at the axial joints I!) in the assembly of Figure 1; this being one typical application of the con nector. . . . ’ observed that the'bulbed ?ange parts 35(substan tially conform to the trough of the lock strip 3! with the bulbs 3E engaging over the bulbs 39'. This interlocking engagement of the strip 3| and members 30 positively holds the sections B against relative transverse displacement and maintains the serrations 3'.’ in mesh‘ for the dependable transmission of longitudinal shear loads. It is 25 preferred to make the outer face E6 of the lock strip 3! ?at or of thesame contour as the sections " B and to proportion the parts so that the face 49 - The joint or connector illustrated in Figures 4 lies flush with the outer surfaces of the sections B. and 5 is such that it may be assembled or made This provides a flush joint and is of importance in up from the exterior of the structure and is there 30 aircraft where aerodynamic designs require ?ush fore advantageous in situations where the interior joints. The lock strip 3| may be readily slid‘tov of the structure is inaccessible. The connector the position where'it cooperates with the ?ange is useful with closures for access openings, and the parts 35 throughout the entire-length of the con like, although not limited to such applications, nection; The strip 3! is merely entered intothe and in Figure 1 I have shown the connector join 35 connection at one of its ends and advanced to .its ing the two sections S of the boom assembly. ?nal position. If required, the. strip 3! may be The construction of Figures 4 and 5 comprises secured in its ?nal position by a screw or pin 4! two members 30 connected to the assembly sec engaged in openings in the strip and a part 35 tions B and formed to have meshing or interlock . adjacent one end of the connector. ing cooperation, and a locking strip 3! for hold 40 The connector of Figures (land 5 may be con ing the members 30 in the interlocking relation structed to provide for the quick ready assembly. ship. of the sections B. The parts may be formed so The members 39 are secured to the edge por that the lock strip 3! may be assembled in its ?nal. tions of the sections B as by rivets 32, screws position‘ by merely introducing the side parts 3?“ orwelding. The members 30 are identical angu 4: into the troughs of the ?anges 34; and then shift lar elements and when formed of an aluminum ing the strip a short distance in either longitudi" or magnesium alloy, may be extruded sections. nal direction. As best illustrated in Figure‘ 5, the It is preferred to provide the members 36 with bulbs 36 of the ?ange parts 35 have pluralities ?anges 33 similar to the ?anges l3. The ?anges , of spaced interruptions or notches 42. The 33 are arranged against the inner faces of the notches 42 may be equally spaced and formed to sections B and are secured to the sections by the leave teeth or projections 53 of equal width. ' The rivets 32 or other selected attaching means. bulbs/39 of the parts 3i“ have similar spaced in The members 3Q further include inturned or terruptions or notches’ 44 leaving teeth or. projecé inwardly projecting ?anges 34 on the main ?anges 33. The ?angest-t are substantially U 55 In assembling the construction of Figures 4 and or J -shaped in transverse cross section extending 5, the'sections B are first brought to the positions inwardly from the ?anges 33, then curving later-p where the serrations 31 are in full meshing en ally in substantially parallel relation to the planes gagement. The strip 3i is then arranged so that of the sections B and then extending outwardly its side parts 3'!a enter the troughs of the ?anges or‘toward said plane. I will term the outwardly 60 3E and. the strip is lowered or pressed inwardly tions 45. extendingportions, ?ange parts 35. .Bulbs 36 rations 341 preferably extend throughout the lengths of the ?ange parts 35 and the serrations ‘ ‘ > so that the projections 45 I pass through the‘ are‘provided on the outer edge portions of the ?ange parts 35. The bulbs 36 present curved or convex shoulders in the troughs of the J ?anges 34. h In accordance with the invention, the oppos ‘ ing faces of the ?ange parts 35 have multiplici ties of teeth or serrations 31. The series of ser - notches 42. Figure 5 illustrates this position [of 65 the strip 3|. The strip 3| is then moved longi; tudinally in either direction a distance’ equal to the width of theprojections 53 so that the pro J'ections 45 of the bulbs/39 engage under the pro-_ ' jections 4130f the bulbs 35, The strip 3i may then of the two members are identical to accurately mesh. Ihave shown the serrations 31 of V shaped transverse cross section, and the serra be secured in this position ‘by-the pin or screw 4|. It will be observed that the connection may’ be readily assembled in situations where it is di?icult ' Or impossible to enter the strip’ 3| from one end tions 31 may be formed in the same manner as of the connection. _ V . w - p _» The jointor connector, of Figure 6 comprises _ The locking strip 3| is an elongate element. de 75 ;two.members;4‘ij in meshing cooperation and a the serrations H. , _ . 2,405,648‘ 7 key or look strip 48 for holding the members 8 Without the necessity of using‘ multiplicities of screws, rivets or the like, and without the use of I Y . ' ' ' ' special tools; The connectors are positive when The members 41 may beidentical and‘in prac assembled and are capable of withstanding heavy tice may be cut from the'same length of stock. The members 41 are elongate elements ‘having 5 loads in all directions. The connectors are such that the joints may be ?ush and without irregu main ?anges 49 which may be secured to the sec larities of any kind whatsoever. tions C of the assembly by'screws or rivets ‘58. Having described only typical forms of the in Where the parts are formed 1of an aluminum or vention I do not wish to be limited to the spe magnesium alloy, the members 41 may be ex truded parts. The members 41 may extend 10 ci?c details herein set forth, but wish to reserve to myself any variations or modi?cations that throughout the entire length of the joint or con may appear to those skilled in the art or fall within the scope of the following claims. The members 41 are‘further provided with what I claim: I will term ?ange-parts 5|. The ?ange parts 55 1. A connector for securing two elements to extend along the adjacent or opposite edges of gether in assembled relation to have exposed the members 41 and their‘forward or opposing faces in a common plane comprising a member faces areserrated. The faces of the ?ange parts to be attached to each element to extend along 5| are provided with serrations 52 similar to the an edge thereof, a ?ange part extending along above described serrations l1 and 31. The serra each member, said ?ange parts projecting'toward tions 52 are adapted to mesh when the sections C said plane and presenting opposing forward are in the correct assembled relationship. The faces, serrations on the opposite forward faces mating serrations 52 of the two members 41 are of the ?ange parts extending in a direction gen capable of assuming very heavy longitudinal erally transverse of said edges and adapted to shear loads. ‘ mate to hold the elements against relative lon The ?ange parts 5! are shaped to receive the gitudinal movement, longitudinally extending internal lock key or strip 48. Each part 5| has a longitudinally extending opening 53 and a slot bulbs on the rear faces of the ?ange parts, and a channel key slid onto the ?ange parts to hold 54 extending from its serrated fa'ce'to join the opening 53. The slots 54 have ?at generally par their serrations in mesh and having bulbs for allel walls lying in planes parallel with the plane 39 cooperating with the ?rst named bulbs to pre occupied by the sections 0. The walls 55 of the vent relative transverse'movement between the openings 53 at the ends of the slots 54 are flat elements, the channel key presenting a surface and substantially normal to the walls of the slots. occupying said plane to be ?ush with said faces and substantially closing the space between said The locking strip 48 is inserted in the slots 54 and openings 53 to positively lock or key the faces. ' _ 2. A connector for securing two elements to members 41 together in the assembled relation where the serrations 52 are, in mesh.v The key gether in assembled relation comprising a mem strip 48 is shaped, to generally conform to the ber to be attached to each element to extend along slots 54 and openings53. The strip 48 may be . an edge thereof, a channeled ?ange part extend an extruded section of aluminum alloy, or the like, ing longitudinally of each member at the inner where the members 41 are formed of such mate side of its respective element, each ?ange part having an inwardly extending flange and a ?ange rial. The lock strip 48 has a central web 56 and thickened portions or beads 51 which extend along extending outwardly from the inwardly extend its longitudinal edges. The web 56 is shaped and ing ?ange, serrations on opposing faces of said . proportioned to ?t the slots 54'and the beads 51 4. outwardly extending ?anges in a generally trans are shaped to freely ?t the openings 53. The web verse direction and adapted to mate to hold the 56 may have ?at surfaces for engaging with the elements against relative longitudinal movement, ?at walls of the slots 54 and the beads 51 prer and a channel shaped key engaged between said erably have shoulders 58 for engaging with the inwardly and outwardly extending ?anges of the walls 55 of the openings 53. 50 ?ange parts to hold the serrations in mesh and In assembling the connector of Figure 6, the to prevent relative transverse movement of the locked together. nection. - ' > ‘ ' ' sections C are ?rst brought to the correct assem bled relationship Where the, serrations 52 are in full mesh. The key strip 48 is then inserted in an end of the connector assembly to pass into the slots 54 and openings 53. The strip 48 is ad vanced or moved to the ?nal position where it ’ elements. ' 3. A connector for securing two elements to gether in assembled relation comprising a mem ber 'to be attached to each element to extend along an edge thereof, a channeled ?ange part extending longitudinally of each member at the inner side of its respective element, serrations on may extend throughout the entire length of the connector. The strip 48 engaged in the slots 5i’! opposing .faces of the ?ange parts extending in and openings 53 positively locks the members 41 60 a generally transverse direction and adapted'to against transverse displacement and lateral sep mate to hold the elements against relative lon aration. The inter?tting serrations 52 secure the gitudinal movement, and a channel key engaged sections C against relative longitudinal movement ' in ‘said channeled ?ange parts’ to hold the serra and are capable of assuming heavy longitudinal tions'in mesh and to prevent relative transverse shear load. 'There is little or notendencygfor the Go movement of the elements, said key presenting a key strip 48 to become displaced, but if desired surface that is substantially ?ush with the outer a. pin or ‘screw 58 may be engaged in openings in a ?ange part 5| and the key strip adjacent an'en'd of the'connector to hold the strip against longi faces of- the elements. tudinal movement. The joint of Figure 6- may be readily released to permit disconnection of the ing faces in a common plane comprising a mem sections by merely removing the screw 59 and then withdrawing the strip 48. a 4. A connector for securing two elements to gether‘ in assembled relation to have correspond ber to be attached to each element to extend along an edge thereof, a channeled ?ange part extending longitudinally of each memebr at the, inner side of its respective element, vserrations motors that are 'easilvand quickly assembled 75 on opposing faces of the?ange parts extending The present invention provides ‘structural _ con- _ 2,405,643 10 in a generally transverse direction and adapted to mate to hold the elements against relative 6. A connector for securing two elements to gether in assembled relation to have correspond longitudinal movement, and a channel key re ing faces in a common plane comprising a mem movably slid into said channeled ?ange parts ber to be attached to each element to extend from an end of the connector to hold the serra along an edge thereof, a channeled ?ange part extending longitudinally of each member at the inner side of its respective element, the ?ange parts having channels facing outwardly toward said plane, serrations on opposing faces of the ?ange parts extending in a generally transverse direction and adapted to mate to hold the elements against relative longitudinal movement, bulbs in tions in mesh and to lock the elements against relative transverse movement, the key presenting a surface which is ?ush with said faces of the elements. 5. A connector for securing two elements to gether in assembled relation to have correspond 10l ing faces in a common plane comprising a mem ber to be attached to each element to extend the channels of said parts, a channel key remov ably engaged in said channels to hold the serra extending longitudinally of each member at the 16 tions in mesh and presenting a surface that is inner side of its respective element, the ?ange ?ush with said faces of the elements, and bulbs parts having channels facing outwardly toward on the key cooperating with the ?rst named said plane, serrations on opposing faces of the bulbs to prevent relative transverse movement of ?ange parts extending in a generally transverse the parts, the ?rst and second named bulbs being direction and adapted to mate to hold the ele 20 notched so that the key may be entered into said ments against relative longitudinal movement, channels in a transverse direction and then moved bulbs in the channels of said parts, a channel key longitudinally to engage the second named bulbs removably engaged in said channels to hold the under said ?rst named bulbs. serrations in mesh, and bulbs on the key cooper ANDRE CROT. along an edge thereof, a channeled ?ange part ' ating with the ?rst named bulbs to prevent rela tive transverse movement of the parts.