Patent Publication Number: US-11383651-B2

Title: Load carrier foot

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 16/954,360, having a 371 (c) date of Jun. 16, 2020, which is a National Stage application of PCT/EP2018/085449, filed Dec. 18, 2018, which claims priority to EP Application No. 17208327.1, filed Dec. 19, 2017, and German Application No. 202018105171.7, filed Sep. 10, 2018. The disclosures of these applications are hereby incorporated by reference in their entireties. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to a load carrier foot for supporting a load bar on a vehicle, a load carrier bracket for coupling a load carrier foot to a vehicle and to a load carrier comprising a load carrier foot and a load carrier bracket. 
     BACKGROUND 
     Load carrier feet are an essential part of many load carrier systems. In particular, load carrier feet are an inherent component of load carrier systems in which a load bar is fixed to the roof of a vehicle. 
     There exist load carrier feet which are specifically designed to be used on vehicles which do not comprise a roof railing for fixing a load carrier foot. Such load carrier feet are typically coupled to the vehicle by means of a fixation bracket which is able to grab a portion of the car body. Each load carrier foot comprises a mechanism for tightening the fixation bracket to thereby clamp the load carrier foot to the vehicle roof. It is also known that the dimensions of vehicles vary and that, therefore, the load carrier systems need to be adapted to the different vehicle dimensions. 
     A known issue is that the position of load carrier feet on a vehicle roof vary from vehicle to vehicle. In order to address this issue, it is known to use load carrier feet which can be used with different load carrier brackets. In this way, it is possible to manufacture load carrier brackets for different vehicle types while most components of the load carrier foot can remain unchanged. The load carrier brackets need to be able to transfer high forces and need to be securely coupled to the load carrier foot. Coupling the load carrier brackets with known load carrier feet is, however, often cumbersome. The load carrier foot needs to be able to transfer high forces on the load carrier bracket. 
     SUMMARY 
     It is the object to provide an enhanced load carrier foot and an enhanced load carrier bracket. 
     The object is solved by a load carrier foot according to independent claim  1 , a load carrier bracket according to claim  11  and/or according to the following summary. Advantageous further formations are subject of the dependent claims wherein specific further modifications can be gleaned from the following summary. 
     According to a first aspect, a load carrier foot for supporting a load bar on a vehicle is provided. The load carrier foot comprises a holder adapted to receive a load carrier bracket for coupling the load carrier foot to the vehicle. The holder comprises a sleeve portion defining an accommodating space which is configured to partially accommodate the load carrier bracket. 
     The sleeve portion creates a 3D structure that better withstands forces acting on the system. Since the holder comprises a sleeve portion, the overall strength of the bracket is enhanced. Thus, the holder is able to withstand higher forces. Therefore, the holder can be used for transferring higher forces on other elements like the load carrier bracket. In this way, it is possible to transfer all forces necessary for tightening the load carrier bracket via the holder. 
     The sleeve portion can comprise a box-like shape and can comprise an outer wall, an inner wall and two side walls. 
     Preferably, at least the sleeve portion is integrally formed by bending a metal sheet and preferably comprises an overlap section at which two joining sections of the bent metal sheet are overlapped. The overlap section can be quadrangular or trapezoidal shaped. 
     By integrally forming the sleeve portion and/or providing an overlapping section, the strength of the holder is further increased. 
     Preferably, the joining sections are joined by material forming, preferably by clinching or torxing, at at least two joining portions. 
     By joining the joining sections through material forming at at least two joining portions, the strength of the holder can be increased without using additional components. 
     Preferably, the sleeve portion is formed such that the accommodating space is tapered in the longitudinal direction towards an upper portion of the holder. In other words, the sleeve portion can be formed in a funnel-shape comprising a wide lower end and a narrow upper end. 
     Such a configuration has the benefit that an insertion of the load carrier bracket is simplified because a wider portion is available on the insertion side of the sleeve portion. Furthermore, such a configuration provides room for a pivoting movement of the load carrier bracket. 
     Preferably, the overlap section defines an outer wall of the sleeve portion. The sleeve portion can further comprise an inner wall and two side walls. At least the side walls can be inclined with respect to the longitudinal direction in order to form the tapered accommodating space. 
     In this way, the outer wall of the sleeve portion comprises a higher strength compared to other walls of the sleeve portion which additionally qualifies the outer wall for a force transfer on the load carrier bracket. 
     Preferably, the sleeve portion comprises a coupling portion formed in the inner wall. The coupling portion can be formed as an accommodating recess configured to support a tightening member for applying a pushing force on the coupling portion. The accommodating recess can comprise a supporting surface. The supporting surface can be a curved surface. Furthermore, the accommodating recess can comprise an opening for passing a portion of the tightening member through the inner wall. 
     By providing a coupling portion on the inner wall of the sleeve portion, it is possible to apply a force on the inner wall of the sleeve portion for urging the sleeve portion, and thus the holder, in a tightening direction. With such a configuration, a tightening force received from the tightening member is directly applied on the sleeve portion and not on the load carrier bracket. In other words, a tightening force can be applied on the load carrier bracket only by means of the holder. Since the tightening member is not directly supported on the load carrier bracket, the bracket does not have to comprise a specifically formed supporting section or seat section allowing to properly support the tightening member. 
     The supporting surface can be configured to directly support the tightening member. It is also possible to indirectly support the tightening member on the supporting surface using an intermediate member. 
     Preferably, the sleeve portion has an upper edge portion at least partially defining an upper opening of the sleeve portion. The upper edge portion can be configured for an engagement with the load carrier bracket. 
     By providing an upper edge portion for an engagement with the load carrier bracket a simple and reliable engagement means is provided. 
     Preferably, the upper edge portion is convexly formed. 
     Convexly forming the upper edge portion allows a load carrier bracket hooked thereon to move along the upper edge portion during a tightening process. Furthermore, in case the load carrier bracket is oriented slightly obliquely in the sleeve portion a tightening force can be securely transferred on the load carrier bracket via the upper edge portion. 
     Preferably, the load carrier foot further comprises an urging member configured to apply a pushing force on an engaging section of the load carrier bracket towards the upper edge portion. The urging member can be a spring element. The urging member can be arranged in the accommodating space. 
     The presence of the urging member leads to a configuration in which the load carrier bracket automatically snaps on the upper edge portion so that the load carrier bracket is securely hooked on the upper edge portion. Furthermore, the urging member acts as a securing device in that the load carrier bracket remains securely hooked on the upper edge portion unless a user applies a force on the load carrier bracket moving the same against the urging force of the urging member. In the state wherein no bracket is inserted in the accommodating space, the urging member can be unloaded or can already be pretensioned. 
     Preferably, the bracket holder comprises a lower edge portion at least partially defining a lower opening of the sleeve portion. The lower edge portion is configured to contact the load carrier bracket and to transfer a pushing force on the load carrier bracket. 
     Due to the sleeve shape of the holder higher forces can be transferred via the lower edge portion of the holder. 
     The load carrier foot can be specifically designed for supporting the load bar. The load carrier foot can comprise a support member which can be a rear cover of the load carrier foot, i.e. a cover which is arranged on the vehicle side or which is facing towards the vehicle center when the load carrier foot is mounted on the vehicle. The load carrier foot can comprise a foot pad for contacting the vehicle roof and for transferring a load onto the vehicle roof. The support member, e.g. the rear cover, can be movably, e.g. rotatably, supported on the foot pad. More precisely, a lower portion of the support member can be specifically designed to be supported on an upper side of the foot pad. Furthermore, the support member can be configured to support the load bar thereon. In other words, the upper portion of the support member can be configured to support a load bar thereon. Thus, the support member or rear cover is able to transfer a load received from a load bar onto the foot pad. In this way, a major part of a normal force applied on the load carrier foot by the load bar is directly transferred to the foot pad by means of the support member. The configuration can be such that the foot pad only receives forces from the support member, e.g. the rear cover. 
     According to a further aspect, a load carrier bracket for coupling a load carrier foot to a vehicle is provided. The load carrier bracket comprises a vehicle engaging section and a trough-shaped coupling portion. The trough-shaped coupling portion extends from the vehicle engaging section in longitudinal direction of the load carrier bracket and comprises a holder engaging portion engageable with a holder of a load carrier foot. 
     By three-dimensionally forming the load carrier bracket in the above described way, the rigidity and strength of the load carrier bracket is increased. 
     Preferably, the trough-shaped coupling portion is funnel-shaped with the holder engaging portion being formed at a narrow end. In addition or alternatively, the trough-shaped coupling portion is continuously convexly formed in its longitudinal direction and comprises an outer surface adapted to receive a force from the holder of the load carrier foot. 
     By providing a continuously convex formed trough-shaped coupling portion, it is possible to apply higher forces on the outer side of the coupling portion, for example by means of a lower edge of the above mentioned holder. 
     Preferably, the trough-shaped coupling portion extends substantially over the entire length of the bracket. In addition or alternatively, the trough-shaped coupling portion at least partially comprises a box-like shape. For example, the trough-shaped coupling portion can comprise two side walls and a bottom wall which is arranged substantially perpendicular to the side walls. 
     With the latter configuration, the rigidity and strength of the load carrier bracket is even more enhanced. 
     Preferably, the holder engaging section is configured such that the load carrier bracket can be hooked on the holder. The holder engaging section can comprise two hooks. 
     According to a further aspect, a load carrier comprising a load carrier foot as described before and a load carrier bracket as described before is disclosed. The load carrier bracket can be partially accommodated in the accommodating space and releasably engaged with the holder. The load carrier foot can further comprise a tightening member having a tightening member operating portion arranged in the accommodating space between an inner wall of the holder and the load carrier bracket. The holder and the load carrier bracket can comprise access openings configured to provide tool access to the tightening member operating portion. 
     The load carrier can comprise a load bar which is coupled to the load carrier foot. The load carrier foot can comprise the above described holder. Furthermore, the above described load carrier bracket can be inserted in the holder. The load carrier foot can comprise a foot pad which is brought in contact with the roof of a vehicle when the load carrier is mounted. The holder can be operatively coupled with a tightening mechanism of the load carrier foot. The tightening mechanism can be operated by the tightening member. The tightening mechanism can be configured to effect a movement of the holder and to operate a locking mechanism for securely locking the load bar to the load carrier foot when the tightening member is operated. 
     The locking mechanism can be configured to clamp the load bar on a supporting portion of the load carrier foot, which can be a portion of the rear cover. The supporting portion can be an integral part of the rear cover of the load carrier foot. The rear cover can also be referred to as support member for supporting the load bar thereon. The supporting portion can comprise a supporting surface formed in the rear cover. Accordingly, the rear cover can acts as a support for supporting the load bar. In other words, the load bar can be supported on an upper portion of the rear cover. The rear cover can be supported on the foot pad. More precisely, the rear cover can comprise a coupling portion which is engaged with the foot pad. The foot pad can be adapted to contact the vehicle roof and for transferring a load onto the vehicle roof. The rear cover can be movably, e.g. rotatably, supported on the foot pad. More precisely, a lower portion of the rear cover can be specifically designed to be supported on an upper side of the foot pad. Thus, the rear cover can be able to transfer a load received from a load bar onto the foot pad. In this way, a major part of a normal force applied on the load carrier foot by a load carried on the load bar is directly transferred to the foot pad by means of the rear cover. The configuration can be such that the foot pad only receives forces from the rear cover. 
     Furthermore, the present invention relates to a roof rack foot with an adjustment arrangement. The roof rack foot may be a load carrier foot according any of the above described embodiments. A profile element of a roof rack, for example a cross bar, may be attached to a vehicle via the roof rack foot. For example, the profile element of the roof rack may be attached to the roof of the vehicle or to a loading area of the vehicle. The roof rack foot may comprise a first and a second clamping portion, which may be adjusted relatively to each other via the adjustment arrangement to clamp a roof rail or any other element connected to the roof of a vehicle therebetween. A clamping force generated by the clamping portions may be adjusted by adjusting the adjustment arrangement. The adjustment arrangement comprises a bolt with an external thread. The external thread may be formed along a section of the bolt or along the entire bolt length. Further, in circumferential direction of the bolt, the external thread may be formed along only a section or along the entire bolt circumference. The external thread may be any type of thread, for example a right-hand or left-hand thread and/or a metric and/or any other type of thread, which may be formed as a trapezoidal and/or flat thread. 
     In addition, the adjustment arrangement of the roof rack foot comprises a barrel nut, which is preferably formed as a cylindrical nut, i.e. as a nut with a circular cross-section. The barrel nut comprises a barrel axis, which preferably represents an axis of symmetry. Besides the circular cross-section, it is also conceivable that the barrel nut comprises a polygonal and/or any other type of cross-section. The barrel nut comprises a threaded through hole, which is angled with respect to the barrel axis, preferably perpendicular to the barrel axis. The threaded through hole may be formed centrally in the barrel nut along the barrel axis. The threaded through hole may extend completely through the barrel nut and preferably intersects the barrel axis of the barrel nut. The internal thread of the threaded through hole may have an arbitrary configuration but is adapted to the external thread of the bolt. Specifically, the bolt and the barrel nut are matched to each other such that the barrel nut may be screwed onto the external thread of the bolt via the threaded through hole. By screwing the bolt into the barrel nut, the bolt and the barrel nut may be adjusted relative to each other translatory. 
     In addition, the adjustment arrangement of the roof rack foot of the present invention comprises a locking mechanism for preventing loosening of a screw connection between the bolt and the barrel nut. The locking mechanism may be configured to prevent such a loosening completely or merely to weaken it or slow it down. 
     The present invention provides a roof rack foot with high reliability. Via the locking mechanism, loosening of a clamping arrangement, which is used for clamping of the roof rack foot to the vehicle roof, may be prevented. In particular, this is also possible with vibrations, to which a roof rack foot is frequently exposed during intended operation thereof. 
     According to one embodiment, the locking mechanism comprises a bore in the barrel nut running into the threaded through hole. The bore directly abuts on the threaded through hole such that a spatial connection is formed between the bore and the threaded through hole. In particular, the bore extends along the barrel axis. According to one embodiment, the bore extends perpendicular to the threaded through hole. A locking element for preventing loosening of the screw connection is movably provided in the bore. The locking element may be biased via a spring element towards the threaded through hole. With the roof rack foot of this embodiment, no additional components are required to provide a safety mechanism, but the locking mechanism is provided by adapting existing components. This reduces the total number of parts of the roof rack foot. Furthermore, the locking mechanism of the present invention is subjected to low wear, as no materials susceptible to wear, such as plastic or the like, are used. 
     According to another embodiment, the bore is narrowed by clinching at the end facing away from the threaded through hole for preventing the locking element and/or spring from escaping from the bore. By means of the clinching, the diameter of the bore can only be reduced or completely closed. By means of the clinching, the locking element can be integrated into the barrel nut in a particularly simple and cost-effective manner. The clinching allows for easy manufacturing of the adjustment arrangement of the roof rack foot. 
     According one embodiment, the locking element is formed as a ball. However, other designs of the locking element are also conceivable in this regard. In this embodiment, the bore may have a narrowing portion, wherein the diameter of the bore decreases linearly along the bore axis, for example. Here, however, a step-like narrowing and/or a continuous non-linear narrowing are also conceivable. For example, the narrowing portion may have a conical shape. In particular, the narrowing portion comprises a shape adapted to the locking element. If, for example, the locking element is a ball, the narrowing portion may comprise a narrowing portion in the form of a circular segment adapted to the cross-section of the ball. In this embodiment, the narrowing portion is formed adjacent, preferably directly adjacent the threaded through hole. The narrowing portion is designed in such a way that it can prevent the ball from escaping from the bore, at the same time allowing the ball to penetrate spatially into the threaded through hole. Thus, a locking mechanism for preventing loosening of the screw connection described above may be provided in a particularly simple, reliable and cost-effective manner. 
     According to one embodiment, the locking mechanism comprises a depression formed in the bolt. The depression may be groove or notch. However, any other type of depression is conceivable in this regard, e.g. a slot and/or a circle-shaped recess. In particular, the depression is a groove that extends along the axis of the bolt. The groove may be formed along the entire length of the bolt or along a portion of the bolt. Preferably, the bolt comprises two or three such grooves in the circumferential direction, which may be equidistantly spaced in the circumferential direction. The locking mechanism may be configured in this embodiment for preventing loosening of the screw connection by engagement of the locking element with the depression. In this way, a form-fit locking of the screw connection described above can be achieved with low wear. 
     The present invention also relates to a roof rack with a roof rack foot according to one of the embodiments described above. Regarding the understanding and advantages of the individual features, reference is made to the above explanations in connection with the roof rack foot. 
     In a further aspect, the present invention relates to a method of manufacturing a bolt with an external thread, which is preferably suitable for being used with an adjustment arrangement of a roof rack foot according to one of the embodiments described above. The method comprises pressing a groove, which preferably extends in the direction of the bolt axis, into the lateral face of the bolt. Preferably, the method comprises pressing two or three grooves into the lateral face, which are spaced equidistantly in circumferential direction. Furthermore, the method comprises cutting of an external thread into the lateral face of the bolt. Preferably, cutting of the thread takes place after pressing of the groove. Regarding the understanding and advantages of the individual features, reference is made to the above explanations in connection with the roof rack foot. 
     In a further aspect, the present invention relates to a method of manufacturing a barrel nut, which is preferably suitable for being used with an adjustment arrangement of a roof rack foot according to one of the embodiments described above. The method comprises forming a bore in the barrel nut. The barrel nut may further comprise a threaded through hole, wherein the bore may be formed in such a way that it extends into the threaded through hole, e.g. to create a spatial connection therewith. The bore may be configured according to the above embodiments. In addition, the method comprises positioning of a locking element for prevent loosening of a screw connection between the barrel nut and a threaded bolt in the bore. Preferably, a ball and/or a spring for biasing the ball is positioned in the bore. However, other locking elements may also be provided in this regard, as described above. In addition, the method comprises narrowing the diameter of the bore at an end by clinching for preventing escape of the locking element from the bore. As described above, the diameter of the bore may be reduced or completely closed. Preferably, the step of narrowing the diameter takes place after forming of the bore and after positioning the locking element in the bore. Regarding the understanding of the individual features and their advantages, reference is made to the explanations above in connection with the roof rack foot. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a side view of a load carrier foot according to an embodiment. 
         FIG. 2  shows a perspective and sectional view of an assembly of the load carrier foot. 
         FIG. 3  shows a perspective view of a holder according to an embodiment. 
         FIG. 4  shows a perspective and sectional view of the holder of  FIG. 3 . 
         FIG. 5  shows a perspective view of a load carrier bracket according to an embodiment. 
         FIG. 6  shows a perspective and sectional view of the load carrier bracket of  FIG. 5 . 
         FIG. 7  shows a perspective rear view of the holder of  FIG. 3 . 
         FIG. 8  shows a perspective rear view of the load carrier bracket of  FIG. 5 . 
         FIG. 9  shows a top view of an assembly comprising a holder and a load carrier bracket. 
         FIG. 10  shows a side view of the assembly of  FIG. 9 . 
         FIG. 11  shows a perspective sectional view of the holder. 
         FIG. 12  shows a sectional side view of a load carrier foot mounted to a load bar and comprising a load carrier bracket. 
         FIG. 13  shows a perspective view of a holder. 
         FIG. 14  shows a perspective sectional view of a load carrier foot carrying a load bar. 
         FIG. 15  shows a side view of the upper part of the load carrier bracket according to an embodiment. 
         FIG. 16  shows a front view of the load carrier bracket of  FIG. 15 . 
         FIG. 17  shows a side view of a load carrier bracket according to an embodiment. 
         FIG. 18  shows a front view of the load carrier bracket of  FIG. 17 . 
         FIG. 19  shows a side view of a load carrier bracket according to an embodiment. 
         FIG. 20  shows a front view of the load carrier bracket of  FIG. 19 . 
         FIG. 21  shows a side view of a load carrier bracket according to an embodiment. 
         FIG. 22  shows a front view of the load carrier bracket of  FIG. 21 . 
         FIG. 23  shows a side view of a load carrier bracket according to an embodiment. 
         FIG. 24  shows a front view of the load carrier bracket of  FIG. 23 . 
         FIG. 25  shows a side view of a load carrier bracket according to an embodiment. 
         FIG. 26  shows a front view of the load carrier bracket of  FIG. 25 . 
         FIG. 27  shows a side view of a load carrier bracket according to an embodiment. 
         FIG. 28  shows a front view of the load carrier bracket of  FIG. 27 . 
         FIGS. 29 to 32  show perspective views of an assembly comprising a load carrier bracket and a holder. 
         FIG. 33  shows a roof rack foot according to an embodiment of the present invention in a perspective side view. 
         FIG. 34  shows an adjustment arrangement of the roof rack foot shown in  FIG. 33  in a perspective side view. 
         FIG. 35  shows a barrel nut of the adjustment arrangement of  FIG. 34  in a perspective side view. 
         FIG. 36  shows the barrel nut of  FIG. 35  in a side view. 
         FIG. 37  shows the barrel nut of  FIG. 36  in a longitudinal sectional view. 
         FIG. 38  shows the barrel nut of  FIG. 36  in a perspective longitudinal sectional view. 
         FIG. 39  shows the bolt of the adjustment arrangement of  FIG. 34  in a perspective detailed side view. 
         FIG. 40  shows a cross-sectional view of the bolt of  FIG. 39  along line A-A. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     In the following, embodiments will be described with reference to the drawings. It is to be noted that similar elements in the drawings are denoted with the same reference signs. 
       FIG. 1  shows a side view of an assembly comprising a load carrier foot  2  according to an embodiment. A load bar  300  is supported on an upper portion of the load carrier foot  2 . More precisely, an outer surface  302  of the load bar  300  is supported on the upper portion of the load carrier foot  2 . Furthermore, a load carrier bracket  700  is inserted into and fixedly held in the load carrier foot  2 . The load carrier foot  2  further comprises a foot pad  3 . The foot pad  3  is configured to be supported on the roof of a vehicle. As is further shown in  FIG. 1 , the load carrier foot  2  comprises a front cover  5  and a rear cover  4  which cover an interior mechanism of the load carrier foot  2 . 
       FIG. 2  shows an assembly comprising a holder  6 , a load carrier bracket  700  inserted into and coupled with the holder  6 , an urging member  640  for exerting a pushing force on the load carrier bracket  700 , and a tightening member  8  force transmittingly coupled to the holder  6  at an operating portion  81  thereof. 
     The configuration of the holder  6  will be further described with reference to  FIGS. 3, 4 and 7 . The holder  6  comprises a sleeve portion  600  which is formed in a lower portion  67  of the holder  6 . The sleeve portion  600  comprises a box-like shape and comprises an outer wall  602 , an inner wall  603  and two side walls  605  connecting the inner wall  603  with the outer wall  602 . 
     The holder  6  is integrally formed by bending a metal sheet into the described shape. The outer wall  602  is defined by an overlap section  601  which is formed by two joining sections  612 ,  614  of the metal sheet. The joining sections  612 ,  614  are arranged parallel and in contact with each other. More precisely, the joining sections  612 ,  614  are joined with each other by press-forming them together. In the present case, the joining sections  612 ,  614  are clinched together at four joining portions  604 . Accordingly, the outer wall  602  is reinforced by using two layers of sheet metal that are joined to each other. As is visible in  FIGS. 9 and 13 , the joining sections  612 ,  614 , which can also be referred to as overlapping flanges, can extend across the entire width of the holder. This is also depicted in  FIG. 13 . As is also visible in the drawings, the sleeve portion has a completely closed shape encasing an accommodating space  630  in which the load carrier bracket  700  can be at least partially accommodated as is shown in the configuration of  FIG. 2 . 
     The sleeve portion  600  is open on both longitudinal sides. In other words, the sleeve portion  600  comprises a lower opening  622  and an upper opening  615 . The lower opening  622  is partially defined by a lower edge portion  621  which in the present case is a lower edge of the outer wall  602 . The lower edge portion  621  can also be referred to as force application section as this portion is provided for transferring a force from the holder  6  on a load carrier bracket  700  as will be described later. 
     Since the holder  6  comprises the above described sleeve portion the holder  6  is able to withstand higher forces so that it is possible to transfer higher forces by means of the lower edge portion  621 . 
     The upper opening  615  of the sleeve portion  600  is partially defined by an upper edge portion  619 . The upper edge portion  619  corresponds to the upper edge of the inner wall  603  and is configured for an engagement with the load carrier bracket  700 . More precisely, the upper edge portion  619  is convexly formed and comprises a curved supporting surface  620  which faces in the upper direction of the holder  6 . 
     As is also shown in the drawings, the outer wall  602  comprises an access opening  650  providing access to the accommodating space  630  from a front side of the load carrier foot  2 . This access opening  650  is designed such that a tool for operating the tightening member  8  can be inserted into the accommodating space  630 . 
     Furthermore, the holder  6  comprises an upper portion  63  which comprises a coupling portion  64 . The coupling portion  64  comprises two arms  611  each having an opening  613  for accommodating a pivot pin  610  therein. The pivot pin  610  is shown in  FIG. 12  and defines a pivot axis P. In other words, the pivot axis P extends through the centers of the openings  613 . Accordingly, the holder  6  is configured for a pivoting movement about pivot axis P. By pivoting the holder  6 , a load carrier bracket  700  inserted in the holder  6  can be tightened as will be described later. 
     The holder  6  comprises a coupling section  61  for supporting the tightening member  8 . The tightening member  8  is an element which transfers a pushing force on the coupling portion  61  upon operation of the same. The coupling portion  61  comprises an accommodating recess  607  which is formed in the inner wall  603 . The accommodating recess  607  comprises a supporting surface  608  which is formed in a spherical manner. 
     An opening  609  is provided in the supporting surface  608  allowing to pass a portion of the tightening member through the inner wall  603 . Here, the opening is an elongate opening extending along the longitudinal direction of the sleeve portion  600 . The elongate opening can have an extension length allowing to insert the tightening member via the lower opening  622 . In this case, it is possible to provide an access opening  650  which is smaller than an access opening through which the tightening member  8  is to be inserted. This enhances the rigidity of the sleeve portion  600 . 
     Accordingly, it is possible to support an end portion of the tightening member  8  on the supporting surface  608  and coupling the other end to a further element. Thus, the tightening member  8  is a pulling force transmitting element. More precisely, the tightening member  8  is a shaft nut having an operating portion  81 . 
     As can be gathered from  FIG. 2  and  FIG. 12 , the operating portion  81  comprises an engaging section in the form of a hexagon socket which can be reached via the above described access opening  650 . The supporting surface  608  can be used to directly support the tightening member  8 . However, in the configuration as described, an intermediate member  642  (see  FIG. 2 ,  FIG. 11  and  FIG. 12 ) is provided on the supporting surface  608  and the tightening member  8  is supported on the intermediate member  642 . The intermediate member  642  can cover an upper portion of the opening  609  so that the tightening member  8  is supported more properly. The intermediate member  642  can be made of a softer material. In the present configuration, the intermediate member  642  is made from plastics. 
     As mentioned above, an urging member  640  is provided. The urging member  640  is an elastic element which is accommodated in the accommodating space  630 . In the configuration as shown in  FIG. 11 , the urging member  640  comprises a hook-like shape when viewed from the side. The urging member  640  comprises a contact section  644  protruding into the accommodating space  630  from the outer wall side towards the inner wall side and a supporting section  646  which is accommodated in a recess formed on the inner side of the outer wall, more precisely in the inner joining section  614 . In  FIG. 11 , the urging member  640  is shown in an unloaded state and, therefore, the contact section is substantially straight. As already mentioned before, the urging member  640  is configured to apply an urging force on an inserted load carrier bracket  700  in order to urge the load carrier bracket towards the inner wall  603 . The urging member can be made from plastics and can be integrally formed with the intermediate member  642  as described before. 
     A load carrier bracket  700  which can be used with the above holder  6  will be described in the following with reference to  FIGS. 5, 6 and 8 . 
     The load carrier bracket  700  comprises a vehicle engaging section  720  and a trough-shaped coupling portion  730 . The vehicle engaging section  720  is configured to securely grab a portion of a vehicle body. In other words, the vehicle engaging portion  720  is specifically designed so as to fit to a specific vehicle body. As is shown, the vehicle engaging section  720  is a bent or angled portion which is coupled to the trough-shaped coupling portion  730  at one end. At its other end, the vehicle engaging section  720  comprises a free end  724  which protrudes in a direction which is angled with respect to or substantially perpendicular to a longitudinal extension direction of the trough-shaped coupling portion  730 . On the free end  724 , a contact surface  722  is provided which, when the load carrier foot is clamped on the vehicle roof, is pushed against the vehicle body. The vehicle engaging section  720  is configured, such that the free end  724  can be inserted into a suitable space provided on the vehicle, a space between a closed vehicle door and the vehicle body for instance. 
     The trough-shaped coupling portion  730  extends from the vehicle engaging section  720  in the longitudinal direction of the load carrier bracket  700 . Furthermore, the trough-shaped coupling portion  730  comprises a holder engaging portion  710  which is engageable with the holder  6  of a load carrier foot  2 . The trough-shaped coupling portion  730  is funnel-shaped wherein the holder engaging portion  710  is formed at a narrow end of the trough-shaped coupling portion  730 . 
     Moreover, the trough-shaped coupling portion  730  is continuously convexly formed in its longitudinal direction and comprises an outer surface  702  adapted to receive a force from the holder  6  of the load carrier foot  2 . In the context of this disclosure, continuously convexly formed means that there is a wall portion which is continuously convexly formed providing the load carrier bracket with a continuous bulging. Furthermore, continuously convexly formed means that the course of a section in longitudinal direction of the load carrier bracket is curved in only one direction and does not comprise any curvatures in the opposite direction. It is to be noted, that curved is not to be understood in the strict sense that every section has to be curved. Rather, as is shown in the drawings, substantially straight sections  704 ,  706  can be provided which are connected by a curved section  705  resulting in an overall curved shape. 
     The load carrier bracket can be formed symmetrical with respect to a middle plane at least in sections. Since the load carrier bracket has to fit to different types of vehicles, it is necessary to form the vehicle engaging section  720  according to the vehicle body of the vehicle. Accordingly, a lower portion  703  of the load carrier bracket  700  has to be formed corresponding to the vehicle body type. On the other hand, the configuration of the load carrier foot  700  remains the same for different vehicles at least regarding the fixation and engagement of the load carrier bracket  700 . Therefore, an upper portion  701  of the load carrier bracket  700  which is inserted into the holder  6  can always be formed in the same manner. In practice, it turned out that the section-wise forming of the load carrier bracket  700 , i.e. the separate forming of the upper portion  701  and the lower portion  703 , is cost efficient as it allows the use of one and the same tool for forming the upper portion  701 . In this way, only a respective specific smaller tool have to be provided for forming the lower portion  703 . 
     The trough-shaped coupling portion  730  extends substantially over the entire length of the bracket  700  and is uninterrupted. In other words, only a single trough-shaped coupling portion is provided. Furthermore, the trough-shaped coupling portion  730  at least partially comprises a box-like shape. More precisely, the trough-shaped coupling portion  730  comprises two side walls  714  and a bottom wall  716  which is arranged substantially perpendicular to the side walls  714 . The bottom wall  716  and, consequently, the outer surface  702  is convexly shaped giving the overall load carrier bracket  700  a convex shape when viewed from the side. In other words, the trough-shaped coupling portion  730  provides a bulging in only one direction. The bulging is provided on a side of the load carrier bracket  700  opposite to the side where the free end  724  of the vehicle engaging section  720  is provided. In the shown configuration, the bottom wall  716  comprises a curved section  705  arranged between two substantially flat sections  704 ,  706  so that the overall configuration is curved in only one direction. In other words, the bottom wall  716  does not comprise a portion which is curved in the opposite direction. 
     The holder engaging section  710  is configured such that the load carrier bracket  700  can be hooked on the holder  6 . In the shown configuration, the holder engaging section  710  comprises two hooks  712  which are arranged at a distance to each other in lateral direction of the load carrier bracket  700 . The hooks  712  are configured such that they can be engaged with the upper edge portion  619  of the sleeve portion  600  of the holder  6 . The hooks  712  and the free end  724  of the vehicle engaging section  720  can be referred to as protrusions of the load carrier bracket  700  which protrude from the same side of the load carrier bracket  700 . More precisely, when the load carrier bracket  700  is inserted in the load carrier foot  2  and the load carrier foot  2  is mounted on a vehicle, the hooks  712  and the free end  724  protrude towards the vehicle. In other words, the load carrier bracket  700  is inserted into the holder  6  such that the hooks  712  are located on the side of the inner wall  603  of the holder. 
     Assemblies where the above described load carrier bracket  700  is inserted into a holder  6  are shown in  FIGS. 2, 9, 10, 12 and 29 to 32 . 
     The load carrier bracket  700  is inserted into the holder  6  from below. The upper portion  701  of the load carrier bracket  700  is inserted into the sleeve portion  600  through the lower opening  622  up to a position where the holder engaging portion  710  partially protrudes from the upper opening  615 . More precisely, the load carrier bracket  700  is brought into a position in which the hooks  712  are located above the upper edge portion  619  so that the hooks  712  can be brought in contact with the supporting surface  620  of the upper edge portion  619 . 
     As described above, the holder  6  comprises the urging member  640 . Upon inserting the bracket, the urging member  640  comes into contact with the upper portion  701  of the load carrier bracket  700  and pushes the holder engaging portion  710  inward, i.e. towards the upper edge portion  619  so that the hooks  712  are brought into position for an engagement with the upper edge portion  619  and are held there. Accordingly, the load carrier bracket is securely held on the upper edge portion  619  and can only be removed when the load carrier bracket  700  is moved such that the holder engaging portion  710  is moved against the urging force of the urging member  640 . 
     As mentioned before, the upper edge portion  619  is convexly curved and the hooks  712  are arranged at a distance with respect to each other. Thus, the load carrier bracket  700  is supported on the upper edge portion at two different points. The upper edge portion is wider than the width of the holder engaging section  710  leading to a configuration in which the hooks can slide on the surface  620 . In other words, the upper portion  701  of the load carrier bracket  700  is formed such that the load carrier bracket is hingedly held on the upper edge portion  619 . This allows a pivoting movement of the load carrier bracket  700  about the center of the curvature of the surface  620 . In this way, the load carrier bracket can orient itself according to the shape of the vehicle body when the same is tightened by moving the holder  6 . 
     As soon as the load carrier bracket  700  is engaged with the holder  6  in the above described way, the holder  6  can be rotated about the pivot axis P in counterclockwise direction in  FIG. 3  in order to tighten the load carrier bracket  700 . The rotation of the holder  6  is effected by an operation of the tightening member  8  which is supported on the inner wall  603  of the holder  6 . By moving the holder  6 , the load carrier bracket  700  is clamped between the holder  6  and the vehicle body. More precisely, the lower edge portion  621  of the holder  6  is moved towards the vehicle when the tightening member is tightened which leads to a state in which the lower edge portion  621  contacts the outer surface  702  of the load carrier bracket  700  such that the lower edge portion  621  contacts the outer surface  702  right above the curved section  705  in order to push the load carrier bracket towards the vehicle. 
     Furthermore, the holder  6  is held such that the pivot axis P also moves upward during the tightening process. Since the load carrier bracket  700  is supported on the upper edge portion  619  of the holder, a movement of the holder in the upward direction pulls the load carrier bracket in the upward direction so that the contact surface  722  is moved upwards and brought into firm contact with the vehicle body. Due to the shape of the holder and the shape of the bracket, it is possible to generate a higher clamping force. 
     As is shown in the figures, the load carrier bracket  700  comprises an access opening  750 . The access opening  750  is provided such that when the load carrier bracket  700  is hooked into the holder  6  in the above described way, the access opening  750  is aligned with the access opening  650  of the holder  6 . Since both openings are aligned, it is possible to reach the operating portion  81  of the tightening member  8  from the outside by passing a tool through the openings. Due to this configuration, it is possible to support the tightening member on the inner wall  603  of the holder  6 . Furthermore, it is possible to insert the tightening member  8  into the holder  6  prior to the insertion of the load carrier bracket  700 . 
     A possible use of the above assembly comprising the load carrier bracket  700  and the holder  6  in a load carrier is shown in  FIG. 12 . The load carrier comprises a load bar  300  which is coupled to a load carrier foot  2 . The load carrier foot  2  comprises the above described holder  6 . Furthermore, the above described load carrier bracket  700  is inserted in the holder  6 . The load carrier foot  2  comprises a foot pad  3  which is brought in contact with the roof of a vehicle when the load carrier is mounted. The holder  6  is operatively coupled with a tightening mechanism  500  of the load carrier foot  2 . The tightening mechanism  500  is operated by the tightening member  8 . The tightening mechanism  500  is configured to effect a movement of the holder  6  in the above described way about the pivot axis P and to operate a locking mechanism  200  for securely locking the load bar  300  to the load carrier foot  2  when the tightening member  8  is operated. For that, the tightening member  8  is threadedly engaged with a pin  515  which is pivotably held in a force distribution member of the tightening mechanism  500 . The force distribution member transfers an input force on two application sections. 
       FIG. 14  shows a perspective view sectional view of a load carrier comprising a load bar  300 , a load carrier foot  2  supporting the load bar  300  and the load carrier bracket  700 . The load carrier foot  2  comprises the locking mechanism  200  for locking the load bar  300  on the load carrier foot  2 , more precisely for clamping the load bar  300  on a supporting portion  402  of the load carrier foot  2 , which is a portion of the rear cover  4 . In the disclosed configuration, the supporting portion  402  is an integral part of the rear cover  4  of the load carrier foot  2 . The rear cover  4  can also be referred to as support member  400  for supporting the load bar thereon. The supporting portion  402  comprises a supporting surface  406  formed in the rear cover  4 . Accordingly, the rear cover  4  acts as a support for supporting the load bar  300 . In other words, the load bar  300  is supported on an upper portion of the rear cover  4 . The rear cover  4  is supported on the foot pad  3 . More precisely, the rear cover  4  comprises a coupling portion  41  which is engaged with the foot pad  3 . This coupling portion is shown in  FIGS. 12 and 14 . The foot pad  3  is adapted to contact the vehicle roof and for transferring a load onto the vehicle roof. The rear cover, can be movably, e.g. rotatably, supported on the foot pad. More precisely, a lower portion of the rear cover can be specifically designed to be supported on an upper side of the foot pad  3 . Thus, the rear cover  4  is able to transfer a load received from a load bar  300  onto the foot pad  3 . In this way, a major part of a normal force applied on the load carrier foot  2  by the load bar  300  is directly transferred to the foot pad  3  by means of the rear cover. The configuration is such that the foot pad  3  only receives forces from the rear cover. 
     Further embodiments of load carrier brackets will be described in the following with reference to  FIGS. 15-28 . 
       FIG. 15  shows a side view of the upper portion  701  of the load carrier bracket  700 . This upper portion  701  is formed as described with reference to  FIGS. 5, 6 and 8  and is identical in all further described embodiments. In  FIG. 15  the line L 1  indicates a first characteristic of the upper part  701 . More precisely, the bracket  700  widens from the holder engaging section  710  towards the lower portion  703  when viewed from the side. In other words, the width of the side walls  714  increases towards the above mentioned curved section  705  which marks a lower end of the upper part  701 . The boundary between the upper portion  701  and the lower portion  703  is formed by the lower end portion as shown in  FIG. 15  and indicated by line L 2  in  FIG. 16  which is a front view of the upper portion  701  of the load carrier brackets  700 . The side walls  714  can be inclined with respect to the longitudinal direction of the load carrier bracket  700  in order to fit to the accommodating space  630  as formed in the holder  6 . More precisely, the side walls  714  are arranged at an angle such that the load carrier bracket  700  widens from the holder engaging section  710  towards the lower portion  703  when viewed from the front as can be the case with the side walls of the holder described above. The inclination of the side walls is depicted by lines L 5  and L 8  in  FIG. 16 . As is further shown in  FIG. 16 , the upper portion  701  can comprise side wall sections which are formed parallel with respect to each other and parallel to the longitudinal extension direction of the load carrier bracket  700 . These side wall sections can be formed in the area of the holder engaging section  710  and the lower end of the upper part  701  on the opposite side of the upper part  701 . The extension of the side wall sections is depicted by lines L 3 , L 4 , L 6  and L 7 . 
     The lower portion  703  is different in every embodiment. More precisely, the lower portion  703  is respectively adapted to fit to different vehicles. Example shapes of the load carrier bracket  700 , i.e. specific shapes of the lower portion  703  are shown in  FIGS. 17 to 28 . The shapes vary in the lower portion  703 , for example regarding the trough-shaped portion in formed in the lower portion  703  and regarding the vehicle engaging section  720 . Most of the shapes follow the above general shape as described before and are convexly shaped. For example, in  FIG. 23 , an embodiment is shown in which the curved section  705  is bent in opposite direction compared to other embodiments. 
       FIG. 33  shows a roof rack foot  2000  according to an embodiment of the present invention in a perspective side view. By means of the roof rack foot  2000 , a profile element of a roof rack, for example a cross bar, can be attached to the roof of a vehicle. For this purpose, the roof rack foot  2000  according the present embodiment comprises a first clamping element  2001  and a second clamping element  2002 , which are rotatably connected to each other via a joint/hinge  2003 . A roof railing or any other type of element provided on the roof of a vehicle may be clamped between the clamping elements  2001  and  2002 , for example. On the upper side, the roof rack foot  2000 , presently in particular the second clamping element  2002 , forms a support surface  2004 , onto which the profile element, for example the cross bar, can be placed. By means of a fastening element  2005 , the profile element may be detachably attached to the support surface  2004  of the roof rack foot  2000 . 
     The first clamping element  2001  and the second clamping element  2002  may be adjusted relatively to each other via an adjustment arrangement  1000 . More precisely, by actuating the adjustment arrangement  1000 , a clamping force may be applied to an element fixed to the vehicle roof, such as a roof railing, via the clamping elements  2001  and  2002 . If this clamping force is to be maintained during operation even with occurrence of strong vibrations, it must be prevented that the adjustment arrangement loosens/releases and that the clamping elements  2001  and  2002  move away from each other, as this would result in a reduction of the clamping force. 
       FIG. 34  shows the adjustment arrangement  1000  from  FIG. 1  in a perspective side view. The adjustment arrangement  1000  comprises a barrel nut  1002  and a bolt  1003 . As shown in  FIG. 33 , the barrel nut  1002  is provided in an opening  2006  of the second clamping element  2002 . The bolt  1003  of the adjustment arrangement  1000 , on the other hand, projects through a slot  2007  of the first clamping element  2001  and is arranged with a head  1021 , described below, on a side of the first clamping element  2001  facing away from the second clamping element  2002 . The bolt  1003  is screwed into the barrel nut  1002 , as shown in  FIGS. 33 and 34 . By further screwing the bolt  1003  into the barrel nut  1002 , the clamping elements  2001  and  2002  can be further pivoted towards each other via the joint  2003  in order to initiate a clamping operation and to increase a clamping force, respectively. However, if the bolt  1003  is unscrewed from the barrel nut  1002 , the clamping elements  2001  and  2002  may be separated from each other and a clamping force can be reduced. 
     As shown in  FIGS. 35 and 36 , the barrel nut  1002  comprises a circular cross-section, wherein the length of the barrel nut may be more than 1.5 times, preferably more than 1.7 times, more preferably about 1.8 times the diameter of the barrel nut  1002 . The barrel nut  1002  comprises a lateral face  1004  as well as a first side face  1005  and a second side face  1006 . In the present embodiment, the barrel nut  1002  and thus the lateral face  1004  are formed with a constant diameter, wherein the side faces  1005  and  1006  are arranged parallel to each other. The barrel nut  1002  of the present embodiment is therefore designed as a cylindrical nut. In addition, the barrel nut  1002  comprises a barrel axis F, which is, in the present embodiment, a symmetry axis of the barrel nut  1002 . The symmetry axis is shown in  FIG. 36 . 
     In addition, the barrel nut  1002  comprises a threaded through hole  1007 , which extends perpendicular to the barrel axis F in the present case. The threaded through hole  1007  is arranged and configured in such a way that its central axis intersects with the barrel axis F. The threaded through hole  1007  is, in the present embodiment, arranged centrally between the side faces  1005  and  1006 . The threaded through hole  1007  comprises an internal thread  1008  and is preferably provided on one or both sides towards the lateral face  1004  with a thread runout  1009 , for example with a chamfer. 
     In addition, the barrel nut  1002  comprises a bore  1010 , which is formed coaxially with the barrel axis F. In the present embodiment, the bore  1010  extends from the side face  1005  into the barrel nut  1002  and up to the threaded through hole  1007 . The bore  1010  is configured in such a way that it creates a spatial connection to the threaded through hole  1007 . In the area immediately adjacent the threaded through hole  1007 , the bore  1010  comprises a narrowing portion  1011 , in which the diameter of the bore  1010  successively decreases towards the threaded through hole  1007 . The diameter of the bore  1010  has also been reduced by means of a clinching method at the end facing away from the threaded through hole  1007 . By this, a clinching portion  1014  was formed. In the present embodiment, the diameter of the bore  1010  was not completely closed by the clinching method, but only reduced by about half. 
     The clinch portion  1014  holds a compression spring  1013  in position within the bore  1010 , via which a ball  1012  is biased towards the threaded through hole  1007 . The ball  1012  represents a locking element. In other words, the barrel nut  1002  is configured such that the ball  1012  may be biased towards the threaded through hole  1007  by means of the compression spring  1013 , wherein the spring  1013  may be supported on the clinching portion  1014 . The narrowing portion  1011  is adapted in its profile to the dimension of the ball  1012  such that the ball  1012  is retained in the hole  1010  therewith, but projects into the threaded through hole  1007  when it comes into contact with the narrowing portion  1011 , as shown in  FIGS. 36 to 38 . 
     In addition, the adjustment arrangement  1000  comprises the bolt  1003  shown in detail in  FIG. 39 . The bolt  3  comprises a bolt axis B, which is designed as a symmetry axis in the present case. An interface  1022  for actuating the adjustment arrangement, preferably an interface for a tool, in particular a hexagon, is formed in the bolt head  1021 , which is provided at one end of the bolt. A lateral portion  1020  connects to the bolt head  1021  in the direction of the bolt axis B. At first, the lateral portion  1020  exhibits a portion  1026  without external thread adjacent the bolt head  1021 . This portion  1026  can be approximately 20% of the total length of the lateral portion  1020 . A thread portion  1025  with an external thread formed on the lateral portion may adjoin the portion  1026 . The thread portion  1025  may be approximately 65% of the total length of the lateral portion  1020 . A groove  1024  may adjoin the thread portion  1025 , which in turn may abut against an end element  1023 . The end element  1023 , which may be provided at the end of the bolt  1003  facing away from bolt head  1021 , may have the same outer diameter as the portion without thread  1026 . In addition, the thread portion  1025  may have the same outer diameter as the portions  1023  and  1026 . It is conceivable that the end element  1023  is formed detachably at the bolt  1003  in order to enable the end element  1003  to be removed for allowing the barrel nut  1002  to be screwed onto the bolt  1003 . Subsequently, the end element  1023  may be screwed onto the bolt  1003  to prevent the bolt  1003  from being completely unscrewed from the barrel nut  1002 , for example. 
     In addition, the bolt  1003  of the present embodiment comprises three grooves  1027 ,  1027 . 1  and  1027 . 2 , which extend parallel to the bolt axis B along the entire thread portion  1025 . The three grooves  1027 ,  1027 . 1  and  1027 . 2  are shown in the sectional view of  FIG. 40 . As shown in  FIG. 40 , the grooves  1027 ,  1027 . 1  and  1027 . 2  are formed on the lateral face  1020  of the bolt  1003 . 
     The adjustment arrangement  1000  of the roof rack foot  2000  of the present embodiment is configured such that the ball  1012  of the barrel nut  1002 , which is biased via the spring  1013  towards the threaded through hole  1007 , can penetrate into the grooves  1027 ,  1027 . 1  and  1027 . 2  in order to form a form-fit therewith. If the adjustment arrangement  1000  is to be adjusted to increase or decrease a distance between the clamping elements  2001  and  2002 , the bolt  1003  must be turned against the spring force of the spring  1013  to push the ball  1012  out of the groove  1027 ,  1027 . 1  or  1027 . 2 . The form-fit between the ball  1012  and the groove  1027 ,  1027 . 1  or  1027 . 2  thus provides a locking mechanism, which can prevent a screw connection between the bolt  1003  and the barrel nut  1002  from loosening even if the roof rack foot  2000  is exposed to strong vibrations. 
     For manufacturing the barrel nut  1002 , firstly, a bore for the threaded through hole  1007  is formed in the barrel nut  1002 . Subsequently, the internal thread  1008  is cut into the through hole  1007 . In a next step, the bore  1010  is formed from the side face  1005  in the barrel nut  1002 , wherein the narrowing portion  1011  is formed by means of a conical drilling and/or milling tool. In a subsequent step, the ball  1012  and the spring  1013  are placed in the bore  1010  before the bore  1010  is reduced in diameter at the side face  1005  by clinching to form a clinching portion  1014  as a support face for the spring  1013  and to prevent the spring  1013  and ball  1012  from escaping from the bore  1010 . For manufacturing of the bolt  1003 , at first, the grooves  1027 ,  1027 . 1  and  1027 . 2  are pressed into the lateral face of the lateral portion  1020 . Subsequently, the external thread  1027  is cut into the lateral face, in which the grooves  1027 ,  1027 . 1  and  1027 . 2  are formed. 
     The adjustment mechanism  1000  described in connection with  FIGS. 33 to 40  may also be used with any of the embodiments described in connection with  FIGS. 1 to 32 . For example, the tightening mechanism  500  may be formed like the adjustment mechanism  1000 , wherein the tightening member  8  may be formed like the bolt  1003  and the pin  515  like the barrel nut  1002 . 
     The present invention may also be defined by the following numbered clauses: 
     Clause 1: Roof rack foot ( 2000 ) with an adjustment arrangement ( 1000 ), which is preferably part of a clamping arrangement ( 2001 ,  2002 ) for clamping the roof rack foot ( 2000 ) to a vehicle roof, wherein the adjustment arrangement ( 1000 ) comprises: a bolt ( 1003 ) with an external thread ( 1025 ); a barrel nut ( 1002 ), preferably a cylindrical nut, with a barrel axis (F), which comprises a threaded through hole ( 1007 ), which is angled with respect to the barrel axis (F), preferably oriented perpendicular to the barrel axis (F), wherein the barrel nut ( 1002 ) is configured to be screwed onto the external thread ( 1025 ) of the bolt ( 1003 ) via the threaded through hole ( 1007 ); and a locking mechanism ( 1010 ,  1012 ,  1013 ,  1027 ) for preventing loosening of a screw connection between the bolt ( 1003 ) and the barrel nut ( 1002 ). 
     Clause 2: Roof rack foot ( 2000 ) according to clause 1, wherein the locking mechanism comprises a bore ( 1010 ) in the barrel nut ( 1002 ), which extends into the threaded through hole ( 1007 ), said bore ( 1010 ) preferably extending along the barrel axis (F), in which a locking element ( 1012 ) for preventing loosening of the screw connection is movably provided, said locking element ( 1012 ) preferably being biased with a spring element ( 1013 ) towards the threaded through hole ( 1007 ). 
     Clause 3: Roof rack foot ( 2000 ) according to clause 2, wherein the bore ( 1010 ) at the end facing away from the threaded through hole ( 1007 ) has been narrowed by clinching for preventing escape of the locking element ( 1012 ) and/or the spring ( 1013 ) from the bore ( 1010 ). 
     Clause 4: Roof rack foot ( 2000 ) according to clause 2 or 3, wherein the locking element is formed as a ball ( 1012 ) and the bore ( 1010 ) comprises a tapered portion ( 1011 ) adjacent the threaded through hole ( 1007 ) for preventing escape of the ball ( 1012 ) from the bore ( 1010 ). 
     Clause 5: Roof rack foot ( 2000 ) according to any one of clauses 2 to 4, the locking mechanism comprising a depression ( 1027 ) formed in the bolt ( 1003 ) and being configured to prevent loosening of the screw connection by an engagement of the locking element ( 1012 ) with the depression ( 1027 ). 
     Clause 6: Roof rack foot ( 2000 ) according to clause 5, wherein the depression ( 1027 ) in the bolt ( 1003 ) is formed as a groove ( 1027 ), preferably extending along the bolt axis (B), wherein the bolt ( 1003 ) preferably comprises two or three grooves ( 1027 ,  1027 . 1 ,  1027 . 2 ), which are preferably equidistantly spaced in the circumferential direction. 
     Clause 7: Roof rack with a roof rack foot ( 2000 ) according to any one of clauses 1-6. 
     Clause 8: Method of manufacturing a bolt ( 1003 ) comprising an external thread ( 1025 ), said bolt ( 1003 ) preferably being suitable to be used with an adjustment arrangement ( 1000 ) of a roof rack foot ( 2000 ) according to any one of clause 1 to 6, comprising pressing a groove ( 1027 ), which preferably extends in the direction of the bolt axis (B), in the lateral face of the bolt ( 1003 ), wherein preferably two or three grooves ( 1027 ,  1027 . 1 ,  1027 . 2 ), which are preferably equidistantly spaced in the circumferential direction, are pressed in the lateral face; and preferably subsequently, cutting an external thread ( 1025 ) in the lateral face of the bolt ( 1003 ). 
     Clause 9: Method of manufacturing a barrel nut ( 1002 ), said barrel nut ( 1002 ) preferably being suitable to be used with an adjustment arrangement ( 1000 ) of a roof rack foot ( 2000 ) according to any one of clauses 1 to 6, comprising forming a bore ( 1010 ) in the barrel nut ( 1002 ); positioning of a locking element ( 1012 ), preferably a ball ( 1012 ) and/or a spring ( 1013 ) for biasing the ball ( 1012 ), in the bore ( 1010 ) for preventing loosening of a screw connection between the barrel nut ( 1002 ) and a threaded bolt ( 1003 ); and preferably subsequently, narrowing the diameter of the bore ( 1010 ) at one end by means of clinching for preventing escape of the locking element ( 1012 ) from the bore ( 1010 ).