US20040128820A1 - Method of securing workpieces - Google Patents
Method of securing workpieces Download PDFInfo
- Publication number
- US20040128820A1 US20040128820A1 US10/690,633 US69063303A US2004128820A1 US 20040128820 A1 US20040128820 A1 US 20040128820A1 US 69063303 A US69063303 A US 69063303A US 2004128820 A1 US2004128820 A1 US 2004128820A1
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- US
- United States
- Prior art keywords
- grooves
- bolt shaft
- sealant
- locking
- workpieces
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000000565 sealant Substances 0.000 claims abstract description 54
- 229910003460 diamond Inorganic materials 0.000 claims 1
- 239000010432 diamond Substances 0.000 claims 1
- 241001136800 Anas acuta Species 0.000 description 6
- 239000000872 buffer Substances 0.000 description 5
- 238000005304 joining Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012812 sealant material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/04—Rivets; Spigots or the like fastened by riveting
- F16B19/05—Bolts fastening by swaged-on collars
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
- Y10T29/49925—Inward deformation of aperture or hollow body wall
- Y10T29/49927—Hollow body is axially joined cup or tube
- Y10T29/49929—Joined to rod
Definitions
- the invention relates to a method of securing two or more components, i.e. workpieces, with a locking collar, a bolt shaft through a hole in the workpieces and a sealant.
- lockbolts for forming high-strength mechanical joints of two or more workpieces, for example in the field of aircraft manufacturing.
- the lockbolt is secured in aligned holes through the workpieces, which have been sealed or provided with a sealant.
- the lockbolt includes a shaft that extends through the holes in the workpieces, and a bolt head at one end of the shaft, whereby the head lies against the outer surface of one of the workpieces.
- the other end of the shaft that protrudes out of the opposite side of the other workpiece includes a profiled locking portion, onto which is secured a lock ring or collar, such as a swageable collar for establishing a secure force-locking and force-transmitting connection.
- the lockbolt further includes a break-away portion or pintail portion that is connected to the locking portion by a predetermined breaking point or so-called break-pin area, for example in the manner of a frangible neck.
- This break-away portion can be gripped with an appropriate tool, such as a tension-applying tool for forming the mechanically secure connection and then breaking off the break-away portion.
- a lockbolt of the above described general type is disclosed, for example, in published European Patent Application EP 0,955,477.
- the lockbolt according to this publication has the following structure with the following components.
- the lockbolt includes a shaft comprising a shank for penetrating through and closely fitting into the bored holes in the components or workpieces that are to be connected.
- the bolt further includes a bolt head for preventing axial movement of the lockbolt within the bored holes in the workpieces.
- a locking portion or region of the shaft includes plural circumferentially extending annular grooves, which are engaged by a swageable locking collar for establishing a mechanical connection of the lockbolt with the workpieces.
- a pintail or break-away portion is connected to the end of the locking portion by a break-pin area or frangible neck, which is particularly located between the above-mentioned circumferential annular grooves of the locking portion and the pintail.
- an O-ring is arranged on the break-pin area or on the pintail, i.e. generally between the locking collar and the free end of the bolt opposite the bolt head.
- the outer diameter of the O-ring is larger than the diameter of the shank, so that as the lockbolt, with the 0 -ring thereon, is inserted into the bored hole in the workpieces, the O-ring will wipe any excess undesired sealant within the bored hole and prevent this sealant from reaching and filling into the annular circumferential locking grooves.
- the sealant is supposed to stay on the portion of the lockbolt between the O-ring and the free end of the bolt, i.e. on the break-away pintail, without contaminating the grooves of the locking portion of the bolt.
- the sealant or contaminant thus forms a pressurized hydraulic buffer between the locking portion of the bolt and the locking collar.
- the locking collar cannot be properly and completely swaged onto the locking portion of the bolt shank, so that an adequate mechanical holding power cannot be achieved.
- a further disadvantage is that the O-rings must be individually installed on the individual lockbolts, and after the bolt-securing process, the O-rings must be tediously removed, if they have not fallen away by themselves.
- a lockbolt having a bolt shaft and a bolt head at one end of the bolt shaft.
- the bolt shaft includes a locking portion, and a break-away portion connected to the locking portion through a predetermined breaking point.
- the bolt itself is arranged further in combination with a locking collar that is mechanically secured, e.g. crimped or swaged, onto the locking portion of the bolt shaft.
- the circumferential or generally cylindrical surface of the locking portion of the bolt shaft is provided with a knurling thereon, especially in the manner of a so-called brilliant or diamond-patterned functional area.
- the knurling may, for example, include an intersecting or criss-crossing pattern of spiral grooves that respectively spiral in two opposite directions around the locking portion of the bolt shaft, and form therebetween a plurality of diamond-shaped knurling peaks bounded by sloping, knurling flanks.
- This knurling pattern or surface configuration can be cut, pressed, molded, cast, embossed, or otherwise formed on the surface of the locking portion of the bolt shaft.
- the knurling grooves extend at an angle, i.e. in a spiral configuration, from one axial end to the other of the locking portion.
- a sealant is provided between the knurled surface of the locking portion and the locking collar.
- the knurling of the locking portion of the bolt shaft provides the necessary mechanical gripping and locking structures onto which the locking collar is deformed, i.e. crimped or swaged, in order to establish a secure mechanical connection of the locking collar onto the locking portion of the bolt shaft, and thereby to securely mechanically join the workpieces between the bolt head and the locking collar, with the bolt shaft extending through aligning holes provided in the workpieces.
- the knurling allows the sealant between the locking collar and the knurled surface of the locking portion of the bolt shaft to be distributed, and any excessive sealant to be squeezed-out, as follows.
- the sealant becomes smeared or wiped onto the shaft of the bolt, including the locking portion thereof.
- the knurling grooves allow the sealant to become uniformly spread out to form a thin surfacial sealant layer or film over the knurled surface, i.e.
- this thin sealant layer provides an additional sealing and adhesive function without hindering the mechanical swaging or deforming interconnection of the locking collar onto the knurled surface of the locking portion of the bolt shaft.
- the predetermined breaking point or frangible neck is formed by a circumferentially extending annular groove between the locking portion and the break-away portion of the shaft.
- the break-away portion preferably comprises a plurality of parallel circumferentially extending grooves thereon, which allow a tool such as a tensioning tool or clamping, squeezing and upsetting tool to be mechanically secured thereon.
- a significant advantage of the invention is that the knurling provided on the surface of the locking portion of the bolt shaft effectively prevents the formation of encapsulated chambers, and instead provides venting and sealant-escape-paths between the locking portion and the locking collar, as the locking collar is deformed or swaged onto the locking portion of the bolt shaft.
- the knurling grooves provide an outlet for the excess sealant to escape or be squeezed-out from between the locking collar and the locking portion of the bolt shaft along these knurling grooves, and also achieves a targeted distribution of a small remaining amount of sealant to form a thin sealant layer or film between the locking collar and the locking portion of the bolt shaft, as follows.
- the locking collar is securely deformed in a force-locking manner onto the knurling peaks, but the locking collar preferably and advantageously does not completely penetrate into and fill the bottom of the knurling grooves or the shaft base surface between the knurling peaks. This leaves gap channels at the bottom of the knurling grooves, i.e. free gap channels between the knurling base surface and the locking collar, in which the sealant can uniformly distribute itself.
- a knurling pattern including spiral knurling grooves
- the axially extending grooves provide the venting or sealant-distributing function to prevent the formation of a sealed, encapsulated hydraulic buffer of sealant material enclosed in a continuous circumferentially extending groove.
- a generalized feature of an embodiment of the invention is thus that the knurling pattern includes grooves that extend in a direction having an axial component, so as to prevent the formation of enclosed cells or hydraulic buffers in which the sealant becomes trapped between the bolt shaft surface and the locking collar.
- FIG. 1 is a side view of a first embodiment of a lockbolt according to the invention
- FIG. 2 is a side view of the lockbolt of FIG. 1, installed in two sectionally illustrated plate-shaped workpieces that are to be joined, and a sectionally illustrated locking collar arranged on the bolt, at a stage before the locking or joining process;
- FIG. 3 is a view similar to that of FIG. 2, at a stage after completion of the joining process and separation of the break-away portion of the lockbolt;
- FIG. 4 is a side view of a second embodiment of a lockbolt according to the invention.
- a lockbolt 1 includes a flat countersunk head 3 mechanically rigidly connected to one end of a generally cylindrical shaft 20 .
- the lockbolt may have any other conventionally known head configuration, such as a cylindrical head, a pan head, a round head, or the like.
- the shaft 20 Adjoining the bolt head 3 , the shaft 20 includes a cylindrical shank 2 , which transitions through a preferably conically tapering portion 4 into a profiled or surface-patterned locking portion 5 .
- the surface profiling of this locking portion 5 comprises a knurling 6 therearound, made up of knurling peaks 7 B bounded by knurling flanks 7 , between respective adjacent knurling grooves 7 A.
- the knurling peaks 7 B are essentially diamond-shaped, i.e. having a pyramid shape with a four-sided diamond-shaped base, and the knurling grooves 7 A include two sets of grooves respectively extending in opposite spiral directions helically around the surface of the bolt shaft and intersecting one another.
- the locking portion 5 of the bolt shaft 20 is connected through a predetermined breaking point or frangible neck 8 to a break-away portion 10 of the bolt shaft 20 that is adapted to have an installation tool (not shown) engaged thereon.
- the predetermined breaking point or frangible neck 8 is formed by a circumferentially extending groove 9 .
- at least a part of the break-away portion 10 is provided with grooves 11 , particularly such as the illustrated parallel circumferentially extending grooves 11 .
- FIG. 2 shows the arrangement of the lockbolt 1 during the installation process.
- the lockbolt 1 will cooperate with a cylindrical sleeve-shaped locking collar 16 (which may alternatively have an axially shorter ring configuration) to form a mechanically secure connection of two workpieces 12 and 13 with each other.
- the joint and the lockbolt will additionally be sealed by a sealant 18 .
- the workpieces 12 and 13 are substantially plate-shaped workpieces. These two workpieces 12 and 13 are arranged overlapping and surfacially contacting each other with respective individual facing surfaces thereof, and are respectively provided with mutually aligned fitting bore holes 14 and 15 , through which the shank 2 of the lockbolt 1 extends.
- the hole 14 in the workpiece 12 includes a conically tapered countersink recess, in which the countersunk head 3 of the lockbolt 1 is received with the flat surface of the head 3 flush with the outer surface of the workpiece 12 .
- the conically tapering transition portion 4 , the locking portion 5 , the predetermined breaking point 8 , and the break-away portion 10 of the lockbolt 1 protrude outwardly from the opposite side, i.e. the opposite outer surface of the second workpiece 13 .
- the cylindrical sleeve-shaped locking collar 16 is arranged on the bolt shaft 20 so that the conical tapering transition portion 4 as well as the portion 5 of the bolt shaft 20 are received and surrounded in the bore 17 of the locking collar 16 .
- a sealant 18 is applied between the workpieces 12 and 13 , and/or in the holes 14 and 15 of the workpieces 12 and 13 , before or together with the insertion of the shaft 20 of the lockbolt 1 into the holes 14 and 15 .
- the sealant 18 may even be applied directly to the locking bolt 1 when it is inserted into the holes 14 and 15 .
- FIG. 3 shows the completed, mechanically secured and sealed connection of the two workpieces 12 and 13 after completion of the bolt setting and joining process.
- An installation tool (which is not shown) has been set and engaged onto the break-away portion 10 and exerted a compression load onto the locking collar 16 , such that the locking collar 16 has been swaged into a deformed condition 19 in such a manner so that it is engaged and locked in a force-locking manner onto the locking portion 5 of the lockbolt 1 .
- the sealant 18 present within the bore 17 of the locking collar 16 , 19 is being squeezed and spread-out along the knurling 6 , and especially so as to form a thin surfacially extending sealant layer or film along the knurling flanks 7 .
- the sealant 18 does not become trapped or encapsulated between the locking collar 16 , 19 and the locking portion 5 , because the knurling 6 (and especially the 30 knurling grooves 7 A) allow the sealant 18 to be spread out in the axial direction.
- sealant 18 Any excess amount of sealant 18 is squeezed-out or exuded as shown by reference number 18 ′ at the open axial end of the locking collar 16 , 19 , which communicates with the atmosphere around the lockbolt. In this manner, the resulting thin uniform layer of sealant 18 does not hinder the mechanical swaging of the locking collar 16 , 19 onto the knurling 6 , but instead actually provides an additional adhesive bonding and sealing function therebetween.
- the assembly tool is used to separate the break-away portion 10 from the locking portion 5 of the lockbolt 1 at the frangible neck or breaking point 8 .
- the tool engages the grooves 11 , and is then used to deflect and/or twist and/or pull the break-away portion 10 until it is simply broken off at the breaking point 8 .
- FIG. 4 shows a second example embodiment of a lockbolt 1 that is generally similar to that of FIG. 1, except that the knurling 6 has a different configuration.
- the knurling 6 includes square or rectangular knurling peaks 7 B formed between a first set of circumferential knurling grooves 7 A and a second set of axial knurling grooves 7 A.
- the two sets of grooves intersect each other.
- the axially extending grooves 7 A provide for the escape or squeezing-out and distributing of the sealant 18 in the manner as described above in connection with FIG. 3.
- the sealant 18 will form a distributed thin sealant layer between the deformed locking collar and the knurling, which does not hinder the swaging engagement therebetween, but rather provides an additional adhesive bonding and sealing function therebetween.
- a “thin” layer is one that is sufficiently thin so that it does not hinder the mechanical swaging engagement of the collar onto the locking portion.
Abstract
A method of securing at least two workpieces, which includes inserting a bolt shaft through a bore hole formed in each of the workpieces, and applying a sealant to the workpieces. Further, the method includes engaging a locking collar with the bolt shaft such that the locking collar is securely deformed in a locking manner thereby forcing the sealant to uniformly distribute and form a thin surface sealant layer on the bolt shaft.
Description
- This application is a continuation application of published U.S. application Ser. No. 10/081,878, filed on Feb. 20, 2002, which claims priority under 35 U.S.C. § 119 to German Patent Application 101 07 952.4, filed on Feb. 20, 2001, the entire disclosure of both which are incorporated herein by reference.
- 1. Field of the Invention
- The invention relates to a method of securing two or more components, i.e. workpieces, with a locking collar, a bolt shaft through a hole in the workpieces and a sealant.
- 2. Background Information
- It is generally known to use lockbolts for forming high-strength mechanical joints of two or more workpieces, for example in the field of aircraft manufacturing. The lockbolt is secured in aligned holes through the workpieces, which have been sealed or provided with a sealant. The lockbolt includes a shaft that extends through the holes in the workpieces, and a bolt head at one end of the shaft, whereby the head lies against the outer surface of one of the workpieces. The other end of the shaft that protrudes out of the opposite side of the other workpiece includes a profiled locking portion, onto which is secured a lock ring or collar, such as a swageable collar for establishing a secure force-locking and force-transmitting connection. The lockbolt further includes a break-away portion or pintail portion that is connected to the locking portion by a predetermined breaking point or so-called break-pin area, for example in the manner of a frangible neck. This break-away portion can be gripped with an appropriate tool, such as a tension-applying tool for forming the mechanically secure connection and then breaking off the break-away portion.
- A lockbolt of the above described general type is disclosed, for example, in published European Patent Application EP 0,955,477. The lockbolt according to this publication has the following structure with the following components. The lockbolt includes a shaft comprising a shank for penetrating through and closely fitting into the bored holes in the components or workpieces that are to be connected. The bolt further includes a bolt head for preventing axial movement of the lockbolt within the bored holes in the workpieces. A locking portion or region of the shaft includes plural circumferentially extending annular grooves, which are engaged by a swageable locking collar for establishing a mechanical connection of the lockbolt with the workpieces. A pintail or break-away portion is connected to the end of the locking portion by a break-pin area or frangible neck, which is particularly located between the above-mentioned circumferential annular grooves of the locking portion and the pintail. When the locking collar is swaged and coupled onto the grooves of the locking portion, the pintail is released from the shank by breaking the break-pin area.
- Especially according to the above mentioned EP 0,955,477, an O-ring is arranged on the break-pin area or on the pintail, i.e. generally between the locking collar and the free end of the bolt opposite the bolt head. The outer diameter of the O-ring is larger than the diameter of the shank, so that as the lockbolt, with the0-ring thereon, is inserted into the bored hole in the workpieces, the O-ring will wipe any excess undesired sealant within the bored hole and prevent this sealant from reaching and filling into the annular circumferential locking grooves. The sealant is supposed to stay on the portion of the lockbolt between the O-ring and the free end of the bolt, i.e. on the break-away pintail, without contaminating the grooves of the locking portion of the bolt.
- The known arrangement of a lockbolt with a sealant-wiping O-ring is intended to prevent the undesired accumulation of sealant from the bore hole of the workpieces into the locking grooves of the bolt. Such sealant would otherwise have to be manually removed from the grooves before the locking collar can be swaged and engaged thereon. If sealant remains in the grooves when the locking collar is to be swaged thereon, then the sealant becomes trapped and encapsulated by the locking collar within these closed and continuous circumferential grooves, and therefore forms a pressurized hydraulic buffer, which prevents the proper complete swaging engagement of the locking collar into the locking grooves of the bolt.
- In actual practice, while the O-ring wipes some sealant out of the bored hole of the workpieces and thus ahead of and away from the locking grooves of the bolt, some sealant nevertheless still reaches and contaminates the annular circumferential grooves. Thus, the proper functionality of the mechanical swaged connection cannot be reliably and completely ensured in the event of a remaining contamination of the parts of the bolts. This is especially problematic due to the annular circumferential configuration of the locking grooves of the locking portion of the known bolts. Whenever sealant or other contaminant is present in such circumferential annular grooves, the sealant or contaminant becomes sealed and encapsulated in this closed groove by the locking collar being swaged onto the locking portion of the bolt. The sealant or contaminant thus forms a pressurized hydraulic buffer between the locking portion of the bolt and the locking collar. As a result, the locking collar cannot be properly and completely swaged onto the locking portion of the bolt shank, so that an adequate mechanical holding power cannot be achieved. Moreover, a further disadvantage is that the O-rings must be individually installed on the individual lockbolts, and after the bolt-securing process, the O-rings must be tediously removed, if they have not fallen away by themselves.
- In view of the above, it is an object of the invention to provide a lockbolt of the above described general type, which is improved in such a manner so as to achieve a sufficient functional security even when the functional area between the locking portion of the bolt and the locking collar is contaminated with sealant. Another object of the invention is to simplify the work necessary for securely installing and fastening such a lockbolt. The invention further aims to avoid or overcome the disadvantages of the prior art, and to achieve additional advantages, as apparent from the present specification.
- The above objects have been achieved according to the invention in a lockbolt having a bolt shaft and a bolt head at one end of the bolt shaft. The bolt shaft includes a locking portion, and a break-away portion connected to the locking portion through a predetermined breaking point. The bolt itself is arranged further in combination with a locking collar that is mechanically secured, e.g. crimped or swaged, onto the locking portion of the bolt shaft. The circumferential or generally cylindrical surface of the locking portion of the bolt shaft is provided with a knurling thereon, especially in the manner of a so-called brilliant or diamond-patterned functional area. The knurling may, for example, include an intersecting or criss-crossing pattern of spiral grooves that respectively spiral in two opposite directions around the locking portion of the bolt shaft, and form therebetween a plurality of diamond-shaped knurling peaks bounded by sloping, knurling flanks. This knurling pattern or surface configuration can be cut, pressed, molded, cast, embossed, or otherwise formed on the surface of the locking portion of the bolt shaft. Preferably, the knurling grooves extend at an angle, i.e. in a spiral configuration, from one axial end to the other of the locking portion. A sealant is provided between the knurled surface of the locking portion and the locking collar.
- The knurling of the locking portion of the bolt shaft provides the necessary mechanical gripping and locking structures onto which the locking collar is deformed, i.e. crimped or swaged, in order to establish a secure mechanical connection of the locking collar onto the locking portion of the bolt shaft, and thereby to securely mechanically join the workpieces between the bolt head and the locking collar, with the bolt shaft extending through aligning holes provided in the workpieces.
- Moreover, the knurling allows the sealant between the locking collar and the knurled surface of the locking portion of the bolt shaft to be distributed, and any excessive sealant to be squeezed-out, as follows. When the shaft of the locking bolt is inserted through the aligned holes of the workpieces, which have been sealed with a sealant, the sealant becomes smeared or wiped onto the shaft of the bolt, including the locking portion thereof. When the locking collar is deformed and locked onto the knurled surface of the locking portion of the bolt shaft, the knurling grooves allow the sealant to become uniformly spread out to form a thin surfacial sealant layer or film over the knurled surface, i.e. between the knurling and the inner surface of the locking collar being deformed onto the knurling. Thereby, this thin sealant layer provides an additional sealing and adhesive function without hindering the mechanical swaging or deforming interconnection of the locking collar onto the knurled surface of the locking portion of the bolt shaft.
- According to further details of embodiments of the invention, the predetermined breaking point or frangible neck is formed by a circumferentially extending annular groove between the locking portion and the break-away portion of the shaft. Also, the break-away portion preferably comprises a plurality of parallel circumferentially extending grooves thereon, which allow a tool such as a tensioning tool or clamping, squeezing and upsetting tool to be mechanically secured thereon.
- A significant advantage of the invention is that the knurling provided on the surface of the locking portion of the bolt shaft effectively prevents the formation of encapsulated chambers, and instead provides venting and sealant-escape-paths between the locking portion and the locking collar, as the locking collar is deformed or swaged onto the locking portion of the bolt shaft. Particularly, the knurling grooves provide an outlet for the excess sealant to escape or be squeezed-out from between the locking collar and the locking portion of the bolt shaft along these knurling grooves, and also achieves a targeted distribution of a small remaining amount of sealant to form a thin sealant layer or film between the locking collar and the locking portion of the bolt shaft, as follows. During the joining or securing process, the locking collar is securely deformed in a force-locking manner onto the knurling peaks, but the locking collar preferably and advantageously does not completely penetrate into and fill the bottom of the knurling grooves or the shaft base surface between the knurling peaks. This leaves gap channels at the bottom of the knurling grooves, i.e. free gap channels between the knurling base surface and the locking collar, in which the sealant can uniformly distribute itself. In this manner, the formation of an enclosed or encapsulated, pressurized hydraulic buffer (which would be the case in a continuous circumferential extending annular groove) is avoided during the swaging deformation of the locking collar, because the knurling includes spiral grooves that extend helically in the axial direction so as to interrupt and open-up any isolated grooves such as circumferentially extending grooves.
- Instead of a knurling pattern including spiral knurling grooves, it is alternatively possible to provide a knurling pattern formed by the intersection of circumferentially extending grooves and axially extending grooves. With such a knurling pattern, the axially extending grooves provide the venting or sealant-distributing function to prevent the formation of a sealed, encapsulated hydraulic buffer of sealant material enclosed in a continuous circumferentially extending groove. A generalized feature of an embodiment of the invention is thus that the knurling pattern includes grooves that extend in a direction having an axial component, so as to prevent the formation of enclosed cells or hydraulic buffers in which the sealant becomes trapped between the bolt shaft surface and the locking collar.
- In order that the invention may be clearly understood, it will now be described in connection with example embodiments, with reference to the accompanying drawings, wherein:
- FIG. 1 is a side view of a first embodiment of a lockbolt according to the invention;
- FIG. 2 is a side view of the lockbolt of FIG. 1, installed in two sectionally illustrated plate-shaped workpieces that are to be joined, and a sectionally illustrated locking collar arranged on the bolt, at a stage before the locking or joining process;
- FIG. 3 is a view similar to that of FIG. 2, at a stage after completion of the joining process and separation of the break-away portion of the lockbolt; and
- FIG. 4 is a side view of a second embodiment of a lockbolt according to the invention.
- As shown in FIG. 1, a
lockbolt 1 includes a flatcountersunk head 3 mechanically rigidly connected to one end of a generallycylindrical shaft 20. Instead of the countersunkhead 3, the lockbolt may have any other conventionally known head configuration, such as a cylindrical head, a pan head, a round head, or the like. Adjoining thebolt head 3, theshaft 20 includes acylindrical shank 2, which transitions through a preferably conically taperingportion 4 into a profiled or surface-patternedlocking portion 5. The surface profiling of this lockingportion 5 comprises aknurling 6 therearound, made up ofknurling peaks 7B bounded by knurling flanks 7, between respectiveadjacent knurling grooves 7A. In this embodiment, the knurling peaks 7B are essentially diamond-shaped, i.e. having a pyramid shape with a four-sided diamond-shaped base, and theknurling grooves 7A include two sets of grooves respectively extending in opposite spiral directions helically around the surface of the bolt shaft and intersecting one another. - The locking
portion 5 of thebolt shaft 20 is connected through a predetermined breaking point orfrangible neck 8 to a break-awayportion 10 of thebolt shaft 20 that is adapted to have an installation tool (not shown) engaged thereon. In this embodiment, the predetermined breaking point orfrangible neck 8 is formed by acircumferentially extending groove 9. For securely engaging the installation tool onto the break-awayportion 10 of thelockbolt 1, at least a part of the break-awayportion 10 is provided withgrooves 11, particularly such as the illustrated parallel circumferentially extendinggrooves 11. - FIG. 2 shows the arrangement of the
lockbolt 1 during the installation process. Thelockbolt 1 will cooperate with a cylindrical sleeve-shaped locking collar 16 (which may alternatively have an axially shorter ring configuration) to form a mechanically secure connection of twoworkpieces sealant 18. In this example, theworkpieces workpieces shank 2 of thelockbolt 1 extends. - The
hole 14 in theworkpiece 12 includes a conically tapered countersink recess, in which the countersunkhead 3 of thelockbolt 1 is received with the flat surface of thehead 3 flush with the outer surface of theworkpiece 12. The conicallytapering transition portion 4, the lockingportion 5, thepredetermined breaking point 8, and the break-awayportion 10 of thelockbolt 1 protrude outwardly from the opposite side, i.e. the opposite outer surface of thesecond workpiece 13. The cylindrical sleeve-shapedlocking collar 16 is arranged on thebolt shaft 20 so that the conicaltapering transition portion 4 as well as theportion 5 of thebolt shaft 20 are received and surrounded in thebore 17 of the lockingcollar 16. - In order to form a tight seal at the location of this joint, i.e. through the
holes locking bolt 1, asealant 18 is applied between theworkpieces holes workpieces shaft 20 of thelockbolt 1 into theholes sealant 18 may even be applied directly to thelocking bolt 1 when it is inserted into theholes lockbolt 1 into theholes workpieces sealant 18 will be accumulated on theknurling 6, and particularly in theknurling grooves 7A between the knurling flanks 7. According to the invention, it is not necessary to remove thesealant 18 from this area before arranging the lockingcollar 16 thereon, but rather thesealant 18 at this location will purposely serve an additional sealing and adhesive function between thelockbolt 1 and the lockingcollar 16. - FIG. 3 shows the completed, mechanically secured and sealed connection of the two
workpieces portion 10 and exerted a compression load onto the lockingcollar 16, such that the lockingcollar 16 has been swaged into adeformed condition 19 in such a manner so that it is engaged and locked in a force-locking manner onto the lockingportion 5 of thelockbolt 1. While the lockingcollar 16 is being deformed into thedeformed condition 19, simultaneously, thesealant 18 present within thebore 17 of the lockingcollar knurling 6, and especially so as to form a thin surfacially extending sealant layer or film along the knurling flanks 7. Thesealant 18 does not become trapped or encapsulated between the lockingcollar portion 5, because the knurling 6 (and especially the 30knurling grooves 7A) allow thesealant 18 to be spread out in the axial direction. Any excess amount ofsealant 18 is squeezed-out or exuded as shown byreference number 18′ at the open axial end of the lockingcollar sealant 18 does not hinder the mechanical swaging of the lockingcollar knurling 6, but instead actually provides an additional adhesive bonding and sealing function therebetween. - As further indicated in FIG. 3, at the end of the joining process, the assembly tool is used to separate the break-away
portion 10 from the lockingportion 5 of thelockbolt 1 at the frangible neck orbreaking point 8. For example, the tool engages thegrooves 11, and is then used to deflect and/or twist and/or pull the break-awayportion 10 until it is simply broken off at thebreaking point 8. - FIG. 4 shows a second example embodiment of a
lockbolt 1 that is generally similar to that of FIG. 1, except that theknurling 6 has a different configuration. In this embodiment of FIG. 4, theknurling 6 includes square orrectangular knurling peaks 7B formed between a first set ofcircumferential knurling grooves 7A and a second set ofaxial knurling grooves 7A. The two sets of grooves intersect each other. Thereby, theaxially extending grooves 7A provide for the escape or squeezing-out and distributing of thesealant 18 in the manner as described above in connection with FIG. 3. Thus, once again in the embodiment of FIG. 4, thesealant 18 will form a distributed thin sealant layer between the deformed locking collar and the knurling, which does not hinder the swaging engagement therebetween, but rather provides an additional adhesive bonding and sealing function therebetween. In this context, a “thin” layer is one that is sufficiently thin so that it does not hinder the mechanical swaging engagement of the collar onto the locking portion. - Although the invention has been described with reference to specific example embodiments, it will be appreciated that it is intended to cover all modifications and equivalents within the scope of the appended claims. It should also be understood that the present disclosure includes all possible combinations of any individual features recited in any of the appended claims.
Claims (16)
1. A method of securing at least two workpieces, comprising:
inserting a bolt shaft through a bore hole formed in each of the at least two workpieces;
applying a sealant to the at least two workpieces; and
engaging a locking collar with the bolt shaft such that the locking collar is securely deformed in a locking manner thereby forcing the sealant to uniformly distribute and form a thin surface sealant layer on the bolt shaft.
2. The method according to claim 1 , wherein the applying step applies the sealant to the two workpieces before the inserting step inserts the bolt shaft into the bore hole of each of the at least two workpieces.
3. The method according to claim 1 , wherein the applying step applies the sealant directly to the bolt shaft before the inserting step inserts the bolt shaft into the bore hole of each of the at least two workpieces.
4. The method according to claim 1 , wherein the bolt shaft has a locking portion including a plurality of grooves around a surface of the bolt shaft and a plurality of peaks at least some having a parallelogram shape and being disposed between the plurality of grooves, and
wherein the sealant is uniformly distributed via the plurality of grooves around the surface of the bolt shaft when the engaging step engages the locking collar with the bolt shaft.
5. The method according to claim 4 , wherein the plurality of grooves extend in spiral directions helically around the surface of the bolt shaft.
6. The method according to claim 4 , wherein the plurality of grooves include a first group of spiral grooves that respectively extend in a clockwise spiral direction and a second group of spiral grooves that respectively extend in a counterclockwise spiral direction and intersect with said first group of spiral grooves.
7. The method according to claim 4 , wherein the plurality of grooves include a plurality of first grooves extending in a circumferential direction of the bolt shaft and a plurality of second grooves extending in a direction parallel to the circumferential direction such that the first and second grooves intersect with each other
8. The method according to claim 4 , wherein the parallelogram shape is a diamond parallelogram shape.
9. The method according to claim 4 , wherein the parallelogram shape is a pyramid shape with a four-sided base.
10. The method according to claim 4 , wherein the parallelogram shape is a square or rectangular shape.
11. The method according to claim 1 , wherein when the engaging step engages the locking collar with the bolt shaft, excess sealant is squeezed out a second end of the bolt shaft via at least one groove on a surface of the bolt shaft that opens to an outside at an axial end of the locking portion.
12. The method according to claim 4 , wherein respective ones of said plurality of grooves intersect with one another so that all of said plurality of grooves are interconnected and intercommunicated with each other, and
wherein at least one of said plurality of grooves extends to and opens at an open groove end at an axial end of said locking portion along an axial direction of the bolt shaft such that excess sealant is squeezed out the open groove.
13. The method according to claim 4 , wherein said locking portion excludes all annular circumferential grooves.
14. The method according to claim 4 , wherein each of the plurality of peaks includes a parallelogram shape.
15. The method according to claim 4 , further comprising:
breaking off a break-away portion of the bolt shaft that is connected to said locking portion.
16. The method according to claim 15 , wherein the breaking step breaks off the break-away portion by breaking a constricted neck encircled by a circumferential groove.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/690,633 US20040128820A1 (en) | 2001-02-20 | 2003-10-23 | Method of securing workpieces |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10107952.4 | 2001-02-20 | ||
DE10107952A DE10107952C1 (en) | 2001-02-20 | 2001-02-20 | Locking ring bolt, for sealed mechanical connection, has profiled locking region of bolt shaft provided with diamond profiles for distribution of sealing mass |
US10/081,878 US6659699B2 (en) | 2001-02-20 | 2002-02-20 | Lockbolt for forming a mechanically secured and sealant sealed connection between components |
US10/690,633 US20040128820A1 (en) | 2001-02-20 | 2003-10-23 | Method of securing workpieces |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/081,878 Division US6659699B2 (en) | 2001-02-20 | 2002-02-20 | Lockbolt for forming a mechanically secured and sealant sealed connection between components |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040128820A1 true US20040128820A1 (en) | 2004-07-08 |
Family
ID=7674736
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/081,878 Expired - Lifetime US6659699B2 (en) | 2001-02-20 | 2002-02-20 | Lockbolt for forming a mechanically secured and sealant sealed connection between components |
US10/690,633 Abandoned US20040128820A1 (en) | 2001-02-20 | 2003-10-23 | Method of securing workpieces |
US10/690,632 Abandoned US20040136810A1 (en) | 2001-02-20 | 2003-10-23 | Lockbolt for connecting components |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US10/081,878 Expired - Lifetime US6659699B2 (en) | 2001-02-20 | 2002-02-20 | Lockbolt for forming a mechanically secured and sealant sealed connection between components |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/690,632 Abandoned US20040136810A1 (en) | 2001-02-20 | 2003-10-23 | Lockbolt for connecting components |
Country Status (5)
Country | Link |
---|---|
US (3) | US6659699B2 (en) |
EP (1) | EP1233193B1 (en) |
AT (1) | ATE331899T1 (en) |
DE (2) | DE10107952C1 (en) |
ES (1) | ES2266318T3 (en) |
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US7105029B2 (en) * | 2002-02-04 | 2006-09-12 | Zimmer Spine, Inc. | Skeletal fixation device with linear connection |
US7678136B2 (en) * | 2002-02-04 | 2010-03-16 | Spinal, Llc | Spinal fixation assembly |
US6665922B2 (en) * | 2002-05-13 | 2003-12-23 | Hi-Shear Corporation | Pull stem hi-lite pin with pull groove for swaging collars |
US7090674B2 (en) * | 2003-11-03 | 2006-08-15 | Spinal, Llc | Bone fixation system with low profile fastener |
US7214055B2 (en) * | 2003-11-10 | 2007-05-08 | Zippo Manufacturing Company | Colinear burner |
US20050115046A1 (en) * | 2003-12-02 | 2005-06-02 | Woods Mark A. | Methods and systems for fastening components, including composite aircraft panels |
US7763049B2 (en) * | 2004-06-09 | 2010-07-27 | Zimmer Spine, Inc. | Orthopedic fixation connector |
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US20070051851A1 (en) * | 2005-09-02 | 2007-03-08 | The Boeing Company | Multi-piece fastener for limited clearance applications |
US20070065251A1 (en) * | 2005-09-20 | 2007-03-22 | Airbus Deutschland Gmbh | Lockbolt and production method for joining at least two component layers |
US7695226B2 (en) | 2006-09-21 | 2010-04-13 | Alcoa Global Fasteners, Inc. | High performance sleeved interference fasteners for composite applications |
US8092128B1 (en) | 2007-02-20 | 2012-01-10 | Bray Alan V | Self-sealing fasteners |
US9068583B2 (en) | 2007-02-20 | 2015-06-30 | Systems & Materials Research Corporation | Self-sealing fastener |
GB2457038B (en) * | 2008-01-30 | 2011-10-12 | Gareth Phillips | Fixing |
JP5467145B2 (en) | 2009-04-03 | 2014-04-09 | アルコア インコーポレイテッド | Fastener with compatible sleeve |
US9562556B2 (en) | 2009-04-03 | 2017-02-07 | Arconic Inc. | Fasteners with conforming sleeves |
DE202010017260U1 (en) * | 2009-10-22 | 2011-08-26 | Alcoa Inc. | Sleeve fastener with improved conductivity |
DE102009056081A1 (en) | 2009-11-30 | 2011-06-09 | Knipex-Werk C. Gustav Putsch Kg | tongs |
JP2011157996A (en) * | 2010-01-29 | 2011-08-18 | Nippon Pop Rivets & Fasteners Ltd | Blind rivet |
US9488206B2 (en) | 2013-09-19 | 2016-11-08 | Alcoa Inc. | Rivet |
US9759246B2 (en) | 2014-08-25 | 2017-09-12 | Arconic Inc. | Textured sleeves for fasteners |
US9939004B2 (en) | 2014-09-17 | 2018-04-10 | Arconic Inc | Coated fasteners with conforming seals |
CA2955271C (en) | 2014-09-17 | 2019-04-23 | Arconic Inc. | Fasteners with coated and textured pin members |
BR112017005054A2 (en) | 2014-09-17 | 2017-12-05 | Arconic Inc | fasteners with double outer layer depth washers |
JP6852176B2 (en) | 2016-12-13 | 2021-03-31 | アーコニック インコーポレイテッドArconic Inc. | Reduced electromagnetic signature of conformal conical seal fastener system |
US11486520B2 (en) * | 2019-07-25 | 2022-11-01 | Newfrey Llc | Press-fit, friction-retention coupling assembly between hard, inflexible material components |
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- 2002-01-15 AT AT02000826T patent/ATE331899T1/en not_active IP Right Cessation
- 2002-01-15 EP EP02000826A patent/EP1233193B1/en not_active Expired - Lifetime
- 2002-01-15 DE DE50207348T patent/DE50207348D1/en not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
---|---|
EP1233193A2 (en) | 2002-08-21 |
EP1233193A3 (en) | 2003-07-16 |
US6659699B2 (en) | 2003-12-09 |
US20020114680A1 (en) | 2002-08-22 |
ES2266318T3 (en) | 2007-03-01 |
US20040136810A1 (en) | 2004-07-15 |
ATE331899T1 (en) | 2006-07-15 |
DE50207348D1 (en) | 2006-08-10 |
DE10107952C1 (en) | 2002-04-04 |
EP1233193B1 (en) | 2006-06-28 |
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Legal Events
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AS | Assignment |
Owner name: AIRBUS DEUTSCHLAND GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STOEWER, UDO HENNING;TURLACH, GERHARD;REEL/FRAME:015097/0482 Effective date: 20040123 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |