Abstract:
A motor vehicle with a roof configuration which can be displaced between a closed position and open position and has a roof skin. At least one rollover protection element which, in a retracted inoperative position, is concealed under a covering, is moveable, by displacing the covering, into an extended protective position and has a manipulation element for the roof skin in order to be able to penetrate the roof skin to reach the protective position. In order to be able to reliably extend the rollover protection element, it is provided that, on its lower side facing the rollover protection element, the covering has a contact structure which prevents the manipulation element from making contact with the covering.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority, under 35 U.S.C. §119, of German application DE 10 2007 061 014.0, filed Dec. 18, 2007; the prior application is herewith incorporated by reference in its entirety. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The invention is based on a motor vehicle with a displaceable roof configuration and a rollover protection element. 
     A motor vehicle of this generic type is known from published, European patent application EP 1 510 412 A1 corresponding to U.S. Pat. No. 7,407,188. As the roof configuration which can be displaced between the closed position and open position, it has a convertible top which has a roof skin which, in particular, is provided with a rear window. The vehicle furthermore contains a rollover protection element which, in a retracted inoperative position, lies under a covering. The rollover protection element which can be extended into a protective position displaces the covering during its extension movement and can thus come into contact in a pulse-like manner with the roof skin, in particular with the rear window, and therefore the roof skin is manipulated in such a manner that the rollover protection element can penetrate the plane of the roof skin. For this purpose, a manipulation element is disposed on the rollover protection element, the manipulation element being configured as a pointy spike which, during the extension movement of the rollover protection element, strikes against the rear window in the roof skin and, in the process, destroys it. The extended protective position of the rollover protection element is therefore located above the roof skin. 
     SUMMARY OF THE INVENTION 
     It is accordingly an object of the invention to provide a motor vehicle with a displaceable roof configuration and a rollover protection element that overcomes the above-mentioned disadvantages of the prior art devices of this general type, in which the rollover protection element can be reliably moved from its inoperative position into its extended protective position. 
     With the foregoing and other objects in view there is provided, in accordance with the invention, a motor vehicle. The motor vehicle contains a covering, a roof configuration displaceable between a closed position and an open position and having a roof skin; and at least one rollover protection element which, in a retracted inoperative position, and concealed under the covering, is moveable, by displacing the covering, into an extended protective position. The rollover protection element has a manipulation element for penetrating the roof skin to reach the extended protective position. The covering has a lower side facing the rollover protection element and a contact structure for preventing the manipulation element from making contact with the covering disposed on the lower side. 
     The advantages primarily obtained with the invention can be seen in that contact of the manipulation element with the covering is prevented by the contact structure fitted to the lower side of the covering, as a result of which, when the rollover protection element is extended, catching of the manipulation element on the covering is avoided. It is therefore ensured that the manipulation element is not slowed down on the lower side of the covering, which could possibly lead to the rollover protection element failing. 
     In accordance with an added feature of the invention, the covering and the contact structure are produced as a single piece part. 
     In accordance with a further feature of the invention, the contact structure has at least one projection which projects from the lower side of the covering in a direction of the rollover protection element. 
     In accordance with another feature of the invention, the rollover protection element has an upper side, and the manipulation element is configured as a fixed spike on the upper side of the rollover protection element. 
     In accordance with an additional feature of the invention, the manipulation element is attached to the rollover protection element in a laterally offset manner in relation to the contact structure. This counteracts the above-mentioned catching between the covering and the manipulation element. 
     In a development of the invention, the rollover protection element is arranged at an angle in relation to an imaginary vertical which runs parallel to the vertical axis of the vehicle. In other words, the rollover protection element extends obliquely upward into its protective position. 
     In a particularly preferred embodiment, the manipulation element is arranged at the highest point on the rollover protection element such that it is ensured that it reliably comes into contact with the roof skin in order to be able to appropriately manipulate the latter. 
     In accordance with another further feature of the invention, the contact structure is disposed approximately centrally with respect to the rollover protection element. 
     In accordance with a concomitant feature of the invention, the rollover protection element is at least one roll bar. 
     Other features which are considered as characteristic for the invention are set forth in the appended claims. 
     Although the invention is illustrated and described herein as embodied in a motor vehicle with a displaceable roof configuration and a rollover protection element, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims. 
     The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
         FIG. 1  is a diagrammatic, sectional view showing part of a motor vehicle with a roof configuration and a rollover protection element; and 
         FIG. 2  is a diagrammatic, section view being parallel to a transverse axis of the vehicle and taken along the line II-II in  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring now to the figures of the drawing in detail and first, particularly, to  FIG. 1  thereof, there is shown part of a motor vehicle  1  in a sectioned side view. By definition, the motor vehicle  1  has a longitudinal axis FL of the vehicle running in the longitudinal direction of the vehicle, an arrow FR indicating the customary forward direction of travel, i.e. pointing from the non-illustrated vehicle rear in the direction of the vehicle front. By definition, the motor vehicle  1  furthermore has a vertical axis FH of the vehicle, constituting a vertical.  FIG. 2  shows, by definition, a transverse axis FQ of the vehicle, which axis extends along a width of the vehicle. 
     The motor vehicle  1  has a vehicle interior  2  which could also be referred to as the passenger compartment. In the vehicle interior, only a backrest  3  of a vehicle seat  4  is shown in  FIG. 1 . The motor vehicle  1  can be configured with one or with two rows of seats. The vehicle interior  2  can be spanned by a displaceable roof configuration  5 , a part of which is shown in  FIG. 1  in a closed position ST. In an open position (not shown here), the roof configuration  5  is put away in a rear storage compartment  6 . In a particularly preferred embodiment, the roof configuration  5  is therefore provided as a top for the motor vehicle  1  which is configured as a convertible. 
     A rollover protection element  7  is arranged behind the vehicle seat  4 , the rollover protection element  7  is able to be moved from a retracted inoperative position RS into an extended protective position AS in which it protrudes over a roof skin  8  of the roof configuration  5  by penetrating the roof skin  8  by manipulation of the same, which is discussed in more detail further below. 
     The roof skin  8  is formed, for example, by a top material in which a rear window  9  is embedded. The rear window  9  is therefore part of the roof skin  8 . The rollover protection element  7  is preferably arranged on the motor vehicle  1  in such a manner that, in its protective position AS, it has penetrated through the rear window  9  and, in its inoperative position RS, lies below the rear window  9  or the roof skin  8 . 
     The rollover protection element  7  is arranged under a trim panel  10  which has a passage opening  11  which can be closed and opened up by a covering  12 . In its inoperative position RS, the rollover protection element  7  is arranged below the covering  12 . The covering  12  can be detached or removed from the opening  11 . In a preferred embodiment, the covering  12  can be opened about a pivot axis  13 . A covering position  14  of the covering  12  is indicated in  FIG. 1  by a solid line. An open position  15  is indicated by a dashed line. The trim panel  10  can be a rear parcel shelf or a top compartment cover. 
     In order that the covering  12  can be displaced when the rollover protection element  7  is extended from the inoperative position RS into the protective position AS, a lower side  16  of the covering  12  has a contact structure  17  which emerges as at least one projection from the lower side  16  of the covering  12  or is formed integrally therewith and points or is directed toward the rollover protection element  7  in the inoperative position RS. As  FIG. 2  shows, the contact structure  17  can be configured as a narrow, elongate web  18  which points toward the rollover protection element  7 . In a particularly preferred embodiment, the rollover protection element is a U-shaped bar  19  which is arranged upside down, i.e. downwardly opening, in the vehicle. The bar  19  therefore has upright bar sections  20  and  21  which are connected via a crosspiece  22  which could also be referred to as the basis of the U. The contact structure  17  is attached to the lower side  16  of the covering  12  in such a manner that it interacts with the crosspiece  22  of the bar  19 , i.e. during the upwardly directed extension movement (arrow  23 ) of the bar  19  is struck by the bar  19  such that the covering  12  is displaced by the bar  19  during the upwardly directed extension movement  23 , i.e. can be detached from the opening  11 . This releases the path for the rollover protection element  7 . 
     The rollover protection element  7  has a manipulation element  24  which is configured as a spike  25  and points toward the covering  12  or the roof skin  8 . A manipulation element  24  of this type is basically known from published, European patent application EP 1 510 412 A1 mentioned at the beginning, and therefore, with regard to its function, all that needs to be mentioned here is that, during the pulse-like extension of the rollover protection element  7 , it introduces a destructive pulse into the roof skin  8 , in particular enters the rear window  9 , so that the roof skin or rear window can be destroyed such that the rollover protection element  7  can travel virtually unhindered into its extended protective position AS in which at least the crosspiece  22  protrudes over the plane of the roof skin  8 . In the exemplary embodiment shown, the manipulation element is preferably attached in a fixed manner to an upper side  26  of the transversely running crosspiece  22 . It would also be conceivable to configure the manipulation element  24  such that it can be displaced relative to the rollover protection element  7 , which is likewise known from published, European patent application EP 1 510 412 A1 mentioned at the beginning. It is apparent in particular from  FIG. 2  that the manipulation element  24  is arranged in a laterally offset manner in relation to the contact structure  17 . It is therefore prevented that, during the extension of the arrow direction  23 , the manipulation element can become caught on the lower side  16  of the covering. It can furthermore be seen in  FIG. 2  that the bar  19  or the rollover protection element  7  is arranged inclined by an angle α with respect to an imaginary vertical which is formed here by the vertical axis FH of the vehicle, and therefore the transition between crosspiece  22  and upright bar section  20  as it were forms the point or the highest point  27  of the rollover protection element  7 , with the manipulation element  24  being arranged adjacent to the highest point  27 . The inclined configuration results in that the other transition region between crosspiece  22  and the upright bar section  21  lies at the angle α, i.e. somewhat deeper than the highest point  27 , with respect to the horizontally running transverse axis FQ of the vehicle. 
     In the exemplary embodiment shown, the contact structure  17  lies on the lower side  16  of the covering  12  such that its free end  28  comes into contact approximately centrally with the rollover protection element  7 , i.e. with the crosspiece  22 . The contact structure  17  which is configured as a web  18  runs at an angle β with respect to the lower side  16 . In the exemplary embodiment shown, the angle β is unequal to 90°, but could also assume this value. The angle α between the vertical axis FH of the vehicle and the upright bar section  20  is greater than 0° and less than 90°, preferably less than 45°. In particular, it can be provided that the angle α and the angle β assume approximately the same value. The elongate contact structure  17  therefore runs approximately in the direction of the extension movement  23  of the rollover protection element  7 . 
     The contact structure  17  may comprise a plurality of webs  18 . In the exemplary embodiment shown, the contact structure  17  is oriented in the direction of the longitudinal axis FL of the vehicle. It would also be conceivable for the contact structure  17  to enclose an angle with respect to said longitudinal axis FL of the vehicle, but the angle is not illustrated here.