Abstract:
The contact rail assembly ( 1 ) for electrically driven vehicles has two essentially rigid contact rails ( 2, 2′, 44 ) which are arranged in a line in the travel direction and are separated by a distance (L 1 ). Two transition horns ( 6, 6′, 45   a,    45   b ) extend into the intermediate transition region, wherein one transition horn ( 6, 6′, 45   a,    45   b ) is attached to each of the contact rails ( 2, 2′, 44 ). On one section (L 2 ) of the transition region there are the transition horns ( 6, 6′, 45   a,    45   b ) that run parallel to each other separated by a distance (L 3 ) and at an angle to the contact rail ( 2, 2′, 44 ) and essentially parallel to the plane of travel of the vehicle, whereby the width of the transition horns ( 6, 6′, 45   a,    45   b ) is less than the width of the contact rails ( 2, 2′, 44 ). With this configuration, a relatively short transition region can be created between the contact rails ( 2, 2′, 44 ), and the separation (L 3 ) of the short contact wires ( 21 ) running parallel in the transition region, which are attached to the underside of the transition horns ( 6, 6′, 45   a,    45   b ), is likewise relatively small. This contact rail assembly ( 1 ) makes possible a transition by one current collector of the vehicle from one contact rail ( 2, 2′, 44 ) to the other, and a defined current supply is assured (FIG.  1 ).

Description:
BACKGROUND OF THE INVENTION 
     The invention pertains to a contact rail assembly for electrically driven vehicles. Electrically driven vehicles receive power via current collectors from contact lines under electrical voltage. Contact wires used for contact lines are defined in European Standards. To supply electrical power to current collectors, the contact lines are arranged either as hanging wire structures over the tracks or are attached to contact rails. Contact rails are usually employed when power is provided under spatially constricted conditions. Compared to contact rails, suspended wire structures require more space since the contact wire is suspended by means of suspension wires that hang at short intervals from a support cable, and the support points on the support cable are located about 30 to 180 cm higher than the contact wire. The required “construction space” is described by the concept of “system height,” and the system height is equal to the vertical distance to the tracks at the support points. For financial reasons, in tunnels and overpasses, for example, in maintenance or assembly sheds, the system height must necessarily be designed to be very short. Furthermore, the contact wires and support cables are tensioned mechanically to 8-30 kN in order to allow travel speeds of the current collectors of up to 500 km/h. The tensioning devices thus required are complex structures that are difficult to set up, particularly in tunnels, since they require additional space. Another problem is that the current collector mounted on the vehicle is pressing upward with a force of 70-300 N, so that additional space is needed. For these reasons, rigid contact rails are used for travel sections with limited space relationships, such as tunnels or stretches under overpasses, since when using contact rails, no support cables are needed and the contact wire is not deflected upward, since it is attached to the contact rail. Thus, when using the contact rail, the required system height is less than for suspended support structures. Since contact rails can only be produced in limited lengths (usually, 12 m) and since they expand as a result of fluctuations in ambient temperature and as a result of heating due to current flow, they are cut into sections in tunnels, for instance, and are mechanically and electrically separated from each other. Contact rails are also cut into sections in the electrification of maintenance sheds, swing bridges and drawbridges. 
     The transition between two sections of contact rail causes problems. It is usual to run parallel sections of contact rail in a relatively long transition region of a length of 150 cm and more. A partial parallel run of sequential contact rails is cost intensive since, in general, more contact rails and additional support structures are needed. In addition, the transition of the current collector from one contact rail to another is not technically easy to handle. Due to the construction width of the contact rails, the parallel run of the contact wires attached to the contact rails occurs in a relatively long distance of 10 cm and more from each other, and over a length of 150 cm and more the sliding strip attached to the current collector slides along one or both contact wires alternately in an uncontrolled manner. 
     The result of one-side sliding of the contact wire means that the contact wires positioned at the contact rails do not exactly run at the same height, which can be attributed, for example, to inaccuracies in the manufacture or the “on-site assembly” of the contact rails. If the contact is along only one sliding contact wire, then an electrical field forms in the small air gap between the sliding contact wire that does not contact but is still under voltage, and the current collector, and the electric field increases as the size of the air gap decreases. As a result of the high field intensity in this region, arcing may occur. Arcing of any kind is undesirable, since it causes a successive burn-up or wear on the contact wire and on the current collector and produces induction-related voltage peaks that can damage the electric motor of the vehicle. If both sliding contact wires make contact, then arcing occurs due to the given inaccuracies with different contact forces, so that different, significantly fluctuating transition resistances occur at the two contact sites between contact wire and current collector, which is undesirable. 
     In addition to contact wires not exactly located at the same height, and the described electrotechnical problems, the contact point between contact wire and current collector can “skip” from one contact wire to the other under certain circumstances, and this produces an impulse on the current collector every time. This impulse is greater, the greater the speed of travel. Due to the relatively large spacing of the parallel-running contact wires in conventional contact rail assemblies, the impulses are applied relatively far outside the center of the sliding contact of the current collector, so that the occurring impulses cause undesirable, large torque impacts on the current collector and it is deflected accordingly. Another problem in known contact rail assemblies is that the ends of the contact rail must be curved upward in order to ensure that the end of the contact rail will not thread into the linkage of the current collector and destroy it. Bending up the relatively rigid contact rail is only possible if the bend is applied to a relatively long section, so that the mentioned long transition region will result. In addition, bending of the relatively rigid contact rail profile is only possible in a workshop, and as a rule, the 12 m long contact rail bars are connected with great effort. 
     SUMMARY OF THE INVENTION 
     The purpose of the present invention is to create a contact rail assembly that eliminates the above-mentioned disadvantages, and in particular, allows a good transition with little effort between two contact rail sections, which can be traversed at high speeds, with a long service life and requires little maintenance expense. 
     The underlying principle of the invention is that two sequential contact rails in the travel direction are arranged in a line and at a relatively short distance from each other, and at the opposing ends of the contact rails there is one transition horn, whose free ends extend into the transition region and do not contact each other. 
     Since the transition horns do not touch each other, in a first design example of the invention, the two contact rails or the associated transition horns are electrically and mechanically disconnected from each other. But for many applications it is desirable for there to be an electrical connection between two opposing transition horns. Thus, according to a second design example, the transition horns are electrically connected to each other by at least one separate contact section. 
     In both variants, the transition horns are configured and designed so that in a top view, they run into the contact rail assembly on one section of the transition region at a slant with respect to the contact rails, i.e., their free ends protrude out to the side, and run essentially parallel at a distance from each other. The two transition horns are essentially straight on this section. Since an electric field forms between the two transition horns, in the first-described variant of the invention, the spacing of the parallel-running transition horns must be large enough so that even at high humidity, no sparking or arcing can take place between the transition horns. For example, the middle spacing of the two transition horns is 55 mm, which represents a sufficient isolation spacing at an operating voltage of 1.5 kV. For the same reason, in the first variant, the free ends of the transition horns have a corresponding distance from the opposing contact rail. 
     Seen in a side view, the transition horns are positioned against the contact rails such that a contact wire attached to the underside of a transition horn passes smoothly and as a single piece onto the corresponding contact rail, and the contact wire attached at the underside of the other contact rail runs preferably at the same height above the travel plane. 
     Thus, the transition region is not formed by the contact rail itself, but rather by separate components, i.e., by the transition horns. The advantage of this is that the contact rails need not be curved upward. The transition horns can be very precisely manufactured, assembled and adjusted. In comparison to the contact rails, they are short and thus very easy to handle. 
     One important advantage of the use of transition horns consists in that the transition region between the contact rails can be made very short. Thus the section of the transition region where the two transition horns and the contact wires (attached to the underside of the two transition horns) run parallel is likewise very short. Only on this short section does the current collector make a sliding contact with two contact wires. Since the transition horns can be mounted very precisely, i.e. primarily at the same height, the result is that the current collector passes in a defined manner, from the first transition horn in the travel direction, briefly onto both transition horns and makes a sliding contact with it with roughly the same contact force. Next, the current collector “leaves” the first transition horn and makes a sliding contact with a short path only with the second transition horn in the travel direction, or with the following contact rail. Due to the sliding contact with both transition horns of preferably the same size contact force, the transition resistance at the contact points is also roughly equal, so that a voltage drop between the contact points is avoided. Furthermore, spark formation and the resultant wear on the current collector and the contact wires is reduced to a minimum by the very short transition region and by precise assembly of the transition horns. A defined contacting of one, then both, and then again of only one of the transition horns, prevents the contact point between current collector and transition horn from skipping back and forth from one transition horn to the other, creating sparks and causing the current collector to vibrate. A low-vibration propagation of the current collector prevents the current collector from lifting off the contact wire, so that a continuous power supply is assured, and mechanical wear caused by dynamic friction forces on the current collector and contact wire are minimized. Another advantage of this contact rail assembly is that the two transition horns of a transition region can be configured identically, so that the development and manufacturing costs can be reduced. Using an identical configuration and arrangement of the transition horns, the contact rail assembly is point-symmetrical with regard to an intersection point, viewed from above, that is obtained from the intersection of the center perpendicular of the center lines of the two contact rails located in the transition region, with the aligned center lines of the contact rails. 
     According to a refinement of the invention, from a top view of the travel plane, the width of the transition horns is smaller than the width of the contact rails. Thus a relatively small distance can be obtained between the contact wires attached to the undersides of the transition horns. Assuming that the contact wires run centrally on the underside of the transition horns viewed from above, the spacing of the two contact wires in the described symmetrical contact rail assembly can be computed from the sum of the spacing of the two transition horns (on the section of the transition region where they run parallel to each other) and the width of one transition horn. The spacing of the two transition horns is selected as small as possible, depending on the operating voltage, in order to prevent arcing and also to achieve a vibration-free or jolt-free transition of the current collector from one transition horn to the other. Thus, at a given operating voltage, the spacing of the contact wires running centrally on the underside of the two transition horns will be smaller, the smaller the width of the transition horns. Consequently, given a small width of the transition horns, the spacing (lever arm) between the contact point of the contact wire with the current collector, and the middle of the current collector is relatively small, so that the contact forces (static and dynamic contact forces) occurring at the contact point create very little torque and the current collector is deflected very little. Lifting of the current collector and any resultant spark formation is thus prevented and a continuous power supply is assured. 
     According to a refinement of the invention, the transition horns in the connection regions to the contact rails are curved, as seen in a top view, so that given a central placement of the ends of the transition horns with respect to the contact rails, the middle lines of the transition horns open tangentially into the longitudinal axes of the corresponding contact rails. This type of soft or continuous transition of the contact wire attached to the underside of the contact rail or to the transition horns prevents bending of the contact wire. In addition, in the transition of the current collector from the contact rail to the transition horn, a lateral, relative acceleration of the slide bar of the current collector with respect to the transition horn will occur gradually and not suddenly. Thus, lateral friction forces resulting from this relative acceleration and which lead to a lateral deflection of the current collector are prevented by a soft transition. 
     According to a refinement of the invention, the underside of the transition horn is not curved in the region between the free end and the end that is attached to the contact rail, i.e. in a middle region of the transition horn, and is curved upward at the free end of the transition horn. This kind of curvature of the underside at the free end of the transition horn allows a soft transition of the sliding contact of the current collector from the free end of the transition horn onto its middle region, or onto the adjoining contact rail. Peaks in the vertical acceleration of the current collector and peaks in the contact force between the contact rail of the current collector and the contact wire will be avoided. Furthermore, due to the upward curved free ends of the transition horn, the sliding contact of the contact rail will be prevented from impacting on the end of the transition horn, or the transition horn will be prevented from threading into the linkage of the current collector and destroying it. 
     According to a refinement of the invention, the curvature of the underside of the transition horn, and in particular, the height position of the contact wire attached to it, are adjustable. This potential for adjustment allows a precise adjustment of the curvature of the underside of the transition horn and thus an optimum height setting of the contact wire attached to the underside of the transition horn. The adjustment takes place upon assembly of the transition horn and thus can be adjusted “on site” individually for each transition region. 
     According to a refinement of the invention, the curvature of the underside of the transition horn is adjustable by an adjusting mechanism, which is connected to the transition horn and has at least one clamping element. A clamping element of this kind can preferably transfer tension, but also compressive forces, so that the curvature of the underside of the transition horn at the free end can be both increased and also decreased; the free end of the transition horn can thus be curved upward or downward, as needed, and the height position of the contact wire defined by the default curvature can be adjusted precisely. 
     According to a refinement of the invention, the transition horn as seen in a side view has a slit that passes over the mentioned clamping element. This kind of slit reduces the flexural strength of the transition horn at axes that run parallel to the travel plane and transverse to the travel direction of the vehicle. The curvature of the underside of the transition horn can thus be varied by relatively small tensioning forces. 
     According to a refinement of the invention, the slit and the tensioning element passing over the slit are located on the top side of the transition horn. Due to the slitting of the outer contour of the transition horn, for example at its upper side, we obtain an “open profile,” so that the tensioning forces necessary for an adjustable curvature on the underside of the transition horn can be further reduced. 
     According to a refinement of the invention, in the region of the tensioning element of the transition horn and/or in the region of the free end from a side view there is at least one opening, so that at least one opening of the mentioned slit opens into it. Due to these leads in the “profiled interior” of the transition horn, the cross section, and in particular, the flexural resistance of the transition horn are reduced. For example, the transition horn has in its middle region several long, hole-like recesses of differing width that line up and steadily vary the rigidity of the transition horn in its longitudinal direction. One positive side-effect of such openings is the resultant reduction in weight. In order to prevent mechanical stress peaks in the transition horn when adjusting the curvature of the underside of the transition horn, the transitions are of a “soft” design between the individual openings, i.e. rounded, for example. In addition to the openings in the middle region of the transition horn, round holes, for example, are provided in the region of the free end that primarily reduce the weight. 
     According to a refinement of the invention, at least one of the contact rails defining the intermediate transition region and the transition horn attached to this contact rail can move relative to the other contact rail and its transition horn. Thus, a simple disconnection device for sections of the contact rail can be obtained, like that required, for example, for electrified maintenance sheds, swing bridges, and drawbridges. For example, this type of disconnection device can be provided at the transition of the contact rail of one rotary disk for rail vehicles in order to securely mount contact rails of tracks surrounding the rotary disk. The disconnection device has a short contact rail, for example, with transition horns attached to its ends, and the short contact rail plus transition horns can be moved. 
     According to a refinement of the invention, the movement of the short contact rail occurs by pivoting about a pivot shaft that is located transverse to the travel direction and parallel to the travel plane of the vehicle. The horizontal pivot shaft can be easily attached via a retaining device, e.g., to the wall or the ceiling of a maintenance shed, a retaining post or such. 
     According to a refinement of the invention, the contact rail and the transition horn attached to it can be displaced relative to the contact rail following in the travel direction, particularly in the plane parallel to the travel plane. Due to a displacement of one contact rail relative to the other, the transition horn attached to the ends of the contact rails can be displaced toward or away from each other. In order to prevent the displaced contact rail or its transition horn from contacting the other contact rail or its transition horn, a control device can be provided that moves the displaced transition horn at an angle with respect to the other transition horn. In order to enable the displaced contact rail to move, it is attached, e.g., with a retaining device that permits a corresponding movement of the contact rail. 
     According to a refinement of the invention, at least one attachment element is provided at the transition horn with which the contact wire can be attached, and thus a one-piece transition of the contact wire from the contact rail to the transition horn is possible. This type of attachment element can be a tensioning element, for example, that clamps the contact wire by means of a threaded connection from two sides along a clamp edge. Tensioning elements of this kind allow the replacement of a worn contact wire without having to disassemble or replace the transition horn itself. 
     According to a refinement of the invention, at the end of the transition horn an attachment compartment is provided in which the attached end of the transition horn can be inserted and attached. The attachment compartment makes possible a positively fitted connection of the end of the transition horn with the contact rail and a simple attachment by means of through-bolts which pass through the contact rail profile or the end section of the transition horn inserted into the contact rail profile. Thus, a mechanical and electrical connection of the transition horn with the contact rail is assured. Specifically, a central attachment of the end of the transition horn makes it possible to attach narrow transition horns, so that the spacing of the contact wires in the transition region can be minimized. Coupling of the horn to the contact rail takes place, for example, with a one-sided connection to the inside of the profile. The one-sided connection has, for example, a wedge-shaped cross section or bevels. 
     According to another refinement of the invention, the two mutually opposing transition horns or the associated contact rail are electrically connected together. Thus, several individual sections of contact rail can be connected into “one” longer electrically joined contact rail section. The electrical connection is achieved by one or more elastic contact elements. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will be explained in greater detail below based on the drawings. Shown are: 
     FIG. 1, a top view of a contact rail assembly according to the invention; 
     FIG. 2, a side view of a transition horn attached to a contact rail; 
     FIG. 3, a cross section through the transition horn of FIG. 2 along line X of FIG. 2; 
     FIG. 4 a,  a cross section through the transition horn of FIG. 2 in the region of the tensioning element; 
     FIG. 4 b,  an enlarged section of FIG. 4 a  in the region of the retaining element; 
     FIG. 5, a cross section through a contact rail profile; 
     FIG. 6 a,  a side view of a pivoting contact rail assembly with pivot axis parallel to the travel plane and transverse to the travel direction; 
     FIG. 6 b,  a top view of the pivoting contact rail assembly of FIG. 6 a;    
     FIG. 7 a,  a translational contact rail assembly in a first position; 
     FIG. 7 b,  the contact rail assembly of FIG. 7 a  in a second position; 
     FIG. 8, a contact rail assembly with electrically connected transition horns. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     FIG. 1 shows a contact rail assembly  1  with two contact rails  2 ,  2 ′ arranged in a line; the ends  3 ,  3 ′ of said contact rails are separated by a distance L 1 . The distance L 1  can be 600 mm, for example. At the end of the contact rail  2 ,  2 ′ there is an attachment compartment  4 ,  4 ′. The attachment compartment  4 ,  4 ′ is centrally aligned with the longitudinal axis  5 ,  5 ′ of the contact rail  2 ,  2 ′. One end  6   a  of the transition horn  6 ,  6 ′ is inserted into the attachment compartment  4 ,  4 ′. A middle line  7 ,  7 ′ of the transition horn  6 ,  6 ′ opens tangentially or coaxially into the longitudinal axis  5  of the contact rail  2 ,  2 ′, and is curved in the region of the end of the contact rail  2 ,  2 ′ in the direction of the free end  6   b,    6   b′  of the transition horn, and is not curved in a middle region and the end region  6   b,    6   b′  of the transition horn. At the top side of the transition horn  6 ,  6 ′ there is an adjusting mechanism  8 ,  8 ′ for adjusting the curvature of the underside  6   d  of the transition horn  6 ,  6 ′ in the region of its free end  6   b,    6   b′  (cf. FIG.  2 ). The adjusting mechanism  8 ,  8 ′ has a first bending element  9 ,  9 ′ and a second bending element  10 ,  10 ′, which are attached-to the top side of the transition horn and are connected together by a tensioning element  11 ,  11 ′. The tensioning element  11 ,  11 ′ can support both tension and compression forces. The tensioning element  11 ,  11 ′ spans a slit  12  which is located at the top side of the transition horn  6 ,  6 ′ between the two bending elements  9 ,  9 ′ and  10 ,  10 ′. 
     The width of the two transition horns  6 ,  6 ′ is less than the width of the contact rail  2 ,  2 ′. In the middle of the transition region, the two transition horns  6 ,  6 ′ have a spacing L 3 , which is large enough to prevent sparks or arcing. The spacing L 3  is thus an “insulation gap,” so that the two transition horns and the respective contact rails are electrically decoupled from each other. In the middle region of the two transition horns they run along a section L 2  parallel to each other and at an angle to the longitudinal axes  5 ,  5 ′ of the contact rails  2 ,  2 ′. At the underside of the transition horns  6 ,  6 ′ each has a contact wire (not visible in FIG.  1 ), which runs underneath the corresponding middle line  7  or  7 ′. The spacing of the contact wires running parallel on the section L 2  results from the sum of the spacing L 3  and the width of a transition horn  6 ,  6 ′ and is 55 mm, for example. 
     FIG. 2 shows the end  3  of the contact rail  2  and the attached transition horn  6  of FIG.  1 . The shaded regions at the top side of the transition horn  6  indicate that the bending elements  9  and  10  are inserted into holes of the transition horn  6  and are attached by retaining elements  13  and  14 . As retaining elements, split pins, bolts, or similar elements can be used, for example. The free end  6   b  of the transition horn  6  has on its top side a bevel  6   c  and features circular recesses  16   a,    16   b,    16   c  on the inner region to reduce the bending resistance of the free end and to reduce the cross section or the weight of the transition horn  6 . The underside of the free end  6   b  is curved upward by the distance L 4 . The distance L 4  is 21 mm, for example. The length L 5  of the curved section of the underside  6   d  can be 177 mm, for example. In the middle region of the transition horn, in particular in the region of the tensioning element  11 , the transition horn has long, hole-like recesses  17   a,    17   b,    17   c  of varying widths. The widths of these long, hole-like recesses  17   a,    17   b,    17   c  increase in the direction of the free end of the transition horn  6 , which leads to a continuous reduction in the bending strength of the transition horn  6 . The slit  12  opens into the long, hole-like recess  17   b  from the top side of the transition horn  6 . Along the underside  6   d  of the transition horn  6  there are tensioning elements  18   a,    18   b,    18   c,    18   d,  which have threaded holes  19   a,    19   b,    19   c,    19   d  (cf. FIG. 4 a  and FIG. 4 b ). An additional tensioning element can be screwed with the threaded holes and a contact wire  21 , which passes as a single piece from the underside of the contact rail  2  to the underside  6   d  of the contact rail  6 , can be clamped on. The end  6   a  of the transition horn  6  is inserted into the contact rail  2  and attached to the contact rail  2  by means of attachment screws screwed into threaded holes  20   a,    20   b,    20   c,    20   d.  The section of the transition horn which extends from the contact rail has a length L 6 . L 6  is 477 mm, for example. 
     FIG. 3 shows a cross section through the transition horn of FIG. 2 along line X through the threaded holes  20   b  and  20   d.  The cross section through the transition horn  6  in this region is axially symmetric about middle line  23 . The side surfaces  22   a  and  22   b  of the transition horn run at an angle in the region, with respect to the middle line  23 . In the upper region, the transition horn  6  has two slanting surfaces  22   c,    22   d.  The slanting side surfaces  22   a  and  22   b,  and also the slanting surfaces  22   c,    22   d  essentially correspond to the profile interior of the contact rail  2  in the region of the attachment compartment and allow a positively fit connection of the transition horn  6  with the contact rail  2 . 
     FIG. 4 a  shows a cross section through the transition horn  6  in the region of the tensioning element  11 . The standing side surfaces  22   a,    22   b  of the transition horn  6  are discernible in the region of the end  6   a.  The retaining element  18   c  with the threaded through-hole  19   c  is used for clamping the contact wire  21 , as can be seen more easily in FIG. 4 b.  The retaining element  18   c  has a clamping edge  24  and a clamping surface  25  for this purpose. 
     FIG. 4 b  shows an enlarged section from FIG. 4 a  in the region of the tensioning element  18   c.  The contact wire  21  is clamped by the clamping edge  24  and the clamping surface  25  of the clamping element  18  and by the corresponding clamping edge and a clamping surface of an opposing clamping element  26 . The opposing clamping element  26  has a through-hole for the threaded clamping element  18   c.    
     FIG. 5 shows a cross section through a contact rail  2 ; the end  6   a  of the transition horn  6  (cf. FIG. 1) can be inserted into the inner space formed by the attachment compartment  4 . The contact rail is open at the underside and has two legs  30   a  or  30   b  with clamping edges  31   a  or  31   b.  The contact wire  21  is clamped by the slight upward bending of these legs  30   a,    30   b.    
     FIG. 6 a  shows a contact rail assembly  1  with contact rails  2 ,  2 ′, beneath which is attached a contact wire  21  and  21 ′, respectively. Between the two contact rails  2 ,  2 ′ there is a disconnection device  40 . The contact rail  21  is attached by a retaining device  41 , which is electrically decoupled from the contact rail  2 ′ by isolators  42   a,    42   b,  to a structure (not illustrated), such as a retaining post, a building, etc. The separator device  40  is attached by a retaining device  43 , which is electrically decoupled from the separator device by isolators  42   c  and  42   d,  to a structure (not illustrated). The separator device  40  has a short contact rail  44 , and at each end one transition horn  45   a,    45   b  is attached. A contact wire  21   a  is attached beneath the contact rail  44  and its transition horns  45   a  and  45   b.  With the transition horn  6  of the contact rail  2 , the transition horn  45   a  forms a first transition region, and with the transition horn  6 ′ of the contact rail  2 ′, the transition horn  45   b  forms a second transition region. By pivoting the contact rail  44  or its attached transition horns  45   a,    45   b  about a pivot axis  47 , which runs parallel to the travel plane of the vehicle (not illustrated) and transverse to its travel direction, the free ends of the transition horns  45   a,    45   b  move along concentric arcs  46   a,    46   b  about the pivot axis  47 . 
     FIG. 6 b  shows the contact rail assembly  1  of FIG. 6 a,  seen from above, and the separator device  40  is cut away in the region between the isolator  42   d  and the contact rail  44 . The transition horns  6 ,  45   a  and  6 ′,  45   b  do not touch, and thus are electrically decoupled from each other. 
     FIG. 7 a  shows a contact rail assembly  1 , which can be displaced primarily translationally. The contact rail  2  and its attached transition horn  6  are fixed in place, and the contact rail  2 ′ adjoining in the travel direction can move with its transition horn  6 ′ relative to the contact rail  2 . A guide assembly is attached to the contact rail  2 ′, which has three in-line guide assemblies  52   a,    52   b  and  52   c  arranged in series and connected to each other by a rod-like coupling element  57 . In this case, the “outer” two guide assemblies  52   a  and  52   c  with coupling element  57  can turn relative to the contact rail  2 ′ about the guide assembly  52   b  which is located therebetween and which is connected to the contact rail  2 ′. The guide assembly extends between two guide elements  53   a,    53   b,  which are fixed in place relative to the contact rail  2  and the transition horn  6 . The guide elements  53   a,    53   b  are arranged at a distance L 1  from each other, which is slightly greater than the diameter of the guide assemblies  52   a,    52   b,    52   c,  so that the guide assembly device can slide between the guide elements  53   a,    53   b.  On a first section  58  facing the contact rail  2 ′, the guide elements  53   a,    53   b  are essentially parallel to the contact rails  2  and  2 ′. In a region  59  between the contact rails  2  and  2 ′, they are at an angle with respect to the contact rails  2 ,  2 ′. On an adjoining, relatively short section  60  facing the contact rail  2 , the guide elements  53   a,    53   b  are again essentially parallel to the contact rail  2 , and their free ends  53   a′,    53   b′  curve away from each other. The contact rail  2 ′ is connected to a retaining device  54  moving parallel to the travel plane and parallel to the contact rail  2 , and can be displaced in the direction of the opposing contact rail  2  along the guide elements  53   a,    53   b.  The retaining device  54  is connected via an isolator  53  to a guide element (not illustrated) that guides the retaining device  54  in the travel direction. After a displacement of the contact rail  2 ′ and of the attached transition horn  6 ′, the guide assemblies  52   a,    52   b  and  52   c  slide between the guide elements  53   a  and  53   b  arranged at a distance L 1  from each other, which leads to a lateral offset of the contact rail  2 ′ relative to the contact rail  2 . 
     FIG. 7 b  shows a second position of the contact rail assembly  1 , in which the contact rail  2 ′ is displaced and laterally offset to the contact rail  2 . After a displacement of the contact rail  2 ′, the retaining device  54  moves parallel to the contact rail  2 , and the lateral spacing between the isolator  53  and the contact rail  2  remains unchanged. In order to allow a lateral offset motion of the contact rail  2 ′, it is connected to the isolator  53  via a parallelogram linkage  55 , which allows the contact rail  2 ′ to swing out transverse to contact rail  2 . The sides of the “parallelogram” are formed by rod-like linkage elements  61 ,  62 ,  63 ,  64 , and these connecting elements  61 ,  62 ,  63 ,  64  are articulated in pairs, i.e., they are connected so that they rotate about axes perpendicular to the travel plane. One of these joints is formed by the middle guide assembly  52   b  connected to the contact rail  2 ′. A joint  56  of the parallelogram linkage  55  located opposite the guide assembly  52   b  is attached to the isolator  53 , and two additional joints  65 ,  66  are used for an articulated connection of the connecting elements  61  and  62 , or  63  and  64 , respectively, that form the sides of the parallelogram. Furthermore, the guide assembly  52   b  connected to the contact rail  2 ′ and functioning as a joint of the parallelogram linkage is connected to the opposing joint  56  of the parallelogram linkage  55  by means of a guide element  67 . During the swinging out of the contact rail  2 ′, this guide element  67  moves the guide assembly  52   b  in a direction perpendicular to the contact rail  2 ′ and prevents a movement of the guide assembly  52   b  in the longitudinal direction of the contact rail  2 . In the displaced position shown, the guide assembly  53   c  and the displaced retaining device  54  are located at the free ends  53   a′,    53   b′  of the guide elements  53   a,    53   b,  and the parallelogram linkage  55  is swung in and the guide assembly  52   b  has moved back relatively near the joint  56 . 
     FIG. 8 shows a contact rail assembly  1 , in which the transition horns  6 ,  6 ′ and the respective contact rails  2 ,  2 ′ are electrically connected, which is required for many applications. The structural and spatial arrangement of the transition horns  6 ,  6 ′ and the associated contact rails  2 ,  2 ′ correspond essentially to the contact rail assembly  1  shown in FIG.  1 . For example, in this embodiment example as well, the two transition horns  6 ,  6 ′ are separated by a distance L 3 , i.e., they do not directly touch. In contrast to the embodiment examples described above (in FIGS. 1 to  7   b ), in which the distance L 3  is primarily an electrical “isolation” distance, the distance L 3  between the two transition horns  6 ,  6 ′ in this embodiment example represents a mechanical decoupling. Due to this mechanical decoupling, it is possible to set up a transition horn  6 ,  6 ′ and its associated contact rail  2 ,  2 ′ to move relative to the other contact rails  2 ,  2 ′ and the other transition horn  6 ,  6 ′, respectively. For example, the contact rail assembly  1  can pivot (cf. FIGS. 6 a  and  6   b ) or move translationally (cf. FIGS. 7 a  and  7   b ). 
     The electrical connection between the transition horn  6  and the respective contact rail  2  and the other transition horn  6 ′ and the respective contact rail  2 ′ is achieved by elastic contact elements  75 ,  76  acting like leaf springs. The two contact elements  75 ,  76  are designed to be “S-shaped” and identical; the contact element  75  is connected to contact rail  2  and its transition horn  6 , and the contact element  76  is connected to the other contact rail  2 ′ and its transition horn  6 ′. Furthermore, the contact elements  75 ,  76  are arranged spatially in the same way to the contact rails  2 ,  2 ′ and the respective transition horns  6 ,  6 ′, so that, as already described in relation to FIG. 1, the entire contact rail assembly  1  is point-wise symmetrical as viewed from above. 
     Individual sections of the contact elements  75 ,  76  can be differentiated according to their structure. With a first section  77 ,  78 , the contact element  75 ,  76  extends into the attachment compartment  4 ,  41  of the contact rail  2 ,  2 ′ and there contacts both the contact rail  2 ,  2 ′ and also the transition horn  6 ,  6 ′. This first section  77 ,  78  is located on that outer side  96 ,  97  of the transition horn  6 ,  6 ′ which is facing away from the other transition horn  6 ,  6 ′. Furthermore, the contact element  75 ,  76  is screwed on this section  77 ,  78  to the contact rail  2 ,  2 ′ and the transition horn  6 ,  6 ′ in the region of the attachment compartment  4 ,  41 , which is indicated by the dashed boreholes  78 ,  79  and  80 ,  81 , respectively. 
     A second section  82 ,  83  extends laterally from the transition horn  6 ,  6 ′ from the attachment compartment  4 ,  4 ′ in the direction of the free end of the transition horn  6 ,  6 ′. On a third section  84 ,  85 , which is relatively short and indented relative to the second section  82 ,  83 , the contact element  75 ,  76  extends away from the outside  96 ,  97  of the transition horn  6 ,  6 ′. A fourth section  86 ,  87  running along the side of the transition horn  6 ,  6 ′ adjoins the third section  84 ,  85 . 
     An adjoining fifth section  88 ,  89  is essentially perpendicular to the fourth section  86 ,  87  and passes through the transition horn  6 ,  6 ′ in the region of the longitudinal recess  17   c  (cf. FIG.  2 ). The transition between the fourth section  86 ,  87  and the fifth section  88 ,  89  is rounded, just like the transition between the fifth section  88 ,  89  and an adjoining sixth section  90 ,  91 . 
     The sixth section  90 ,  91  extends along the outside  98 ,  99  of the transition horn  6 ,  6 ′ in the direction of its free end, which is facing the other transition horn  6 ,  6 ′. The sixth section  90 ,  91  is characterized in that it is convex, as seen from above, i.e., in the direction of the opposing transition horn  6 ,  6 ′, is bulged or is curved like a leaf spring. These sections  90  and  91  press against each other and thus establish the electrical connection between the contact elements  75  and  76  and the transition horns  6 ,  6 ′. 
     Following the sixth section  90 ,  91  is a seventh section  92 ,  93 , which directly contacts the outside of the transition horn  6 ,  6 ′. The contact element  75 ,  76  is attached in the region of the seventh section  92 ,  93  at the transition horn  6 ,  6 ′ by a screw connection  94 ,  95 . By screwing the first section  77 ,  78  and the seventh section  92 ,  93  of the contact element  75 ,  76  to the transition horn  6 ,  6 ′, a defined electrical connection between the contact element  75 ,  76  and the transition horn  6 ,  6 ′ is established. 
     Due to the elasticity of the contact elements  75 ,  76  a sufficiently large contact force between the contact elements  75 ,  76  and correspondingly small electrical transition resistance is achieved. Furthermore, it is thus possible to use the contact elements  75 ,  76  in conjunction with a pivoting contact rail assembly  1  (cf. FIGS. 6 a,    6   b ) or a translational displaceable contact rail assembly  1  (cf. FIGS. 7 a,    7   b ). When pivoting in the pivoting contact rail assembly  1 , the contact elements  75  and  76  first make an asymmetrical contact, then press each other apart until the illustrated position is reached. 
     Aluminum sheet metal or copper plate, for example, can be used as material for the manufacture of the contact elements  75 ,  76 .