Abstract:
The invention relates to a convertible vehicle with a roof, which can be folded up and is provided with a rear window, it being possible, in the closed position of the roof, to lower the rear window at least regionally from a normal position into a lowered position below a window parapet line forming the upper boundary of the car body. In order to simplify the installation of a movable rear window for such an embodiment, provisions are made so that the rear window, in the lowered position as well as in the normal position, is held in a frame, which is firmly connected with the roof, as a result of which special adjustment of the rear window or of a different component with respect to the roof is superfluous.

Description:
BACKGROUND OF THE INVENTION 
     The invention relates to a convertible vehicle with a rear window, which can be lowered below a window parapet line forming the upper boundary of the car body. 
     DE 43 20 603 C2 shows a convertible vehicle, for which a rear window is held in a shaft, which is fitted transversely in a vehicle car body and held separately from the roof construction and can be shifted from an inoperative open position of the rear window in this shaft upwards into a closed position for sealing the folding top at the rear. For assembling such a convertible vehicle, it is necessary to align the roof construction with respect to the car body and to adjust the shaft module, comprising the window in the inoperative position, with respect to the car body and with respect to the roof construction. This increases the adjusting work during the assembly appreciably. In addition, the module, accommodating the window, is a heavy and bulky component which, because of its extent in the installed state, shortens the trunk space. 
     From DE 36 07 650 A1, a convertible vehicle is known, the rear window of which can be shifted by two pairs of levers, together with its frame, from a position, closing the rear window opening, into a stowage position, which is remote from the roof. Such a lever mechanism is exceedingly expensive and requires much space in the vehicle. Moreover, in the closed position, the frame, holding the rear window, is pressed only against the outlet opening, so that sealing problems arise there. 
     SUMMARY OF THE INVENTION 
     It is an object of the invention to improve a convertible vehicle of the type named above with regard to its installation properties. 
     By the inventive holding of the rear window in a frame, firmly connected with the roof, an adjustment of a further component with respect to the folding top is avoided. In the normal position as well as in the lowered position, the rear window remains connected with the folding top. With that, it is aligned adequately merely by adjusting the roof and is installed in the vehicle together with the roof in the same way as a fixed rear window. 
     It is particularly advantageous that the window, in the lowered position, is suspended below the leading edge freely in the car body, so that further bulky and heavy components are unnecessary. 
     In a particularly advantageous development, the rear window can be swiveled up with respect to the frame, which is open downward. Consequently, during the opening or closing of the roof, the frame, with the rear window swiveled up, can be guided over obstacles such as any headrests or roll bars, which would collide with the rear window, if the latter were in the closed position. As a result, particularly in the case of four-seater convertibles, very advantageous, kinematic swiveling up conditions can be created for the roof, which results in more headspace for the persons seated in the back and, at the same time, advantageous optics. Moreover, if the rear window is in an approximately vertical position, the visibility towards the rear is very good. 
     Further advantages and distinguishing features arise out of the examples of the object of the invention shown in the accompanying drawings and the following description. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 shows a perspective diagrammatic partial view of the rear of an inventive convertible vehicle, 
     FIG. 2 shows a diagrammatic side view of the rear region of the folding top with the rear window in a normal position, 
     FIG. 2 a  shows a section along the line IIa—IIa of FIG. 2, 
     FIG. 2 b  shows a view of a detail of approximately the region  2   b  in FIG. 2, cut in the longitudinal median plane of the vehicle, 
     FIG. 3 shows a view, similar to that of FIG. 2, with a partially lowered rear window, 
     FIG. 4 shows a view, similar to that of FIG. 3, with a completely lowered rear window, 
     FIG. 5 shows a view, similar to that of FIG. 2, of an alternative embodiment, which additionally comprises a swiveling lever control for making it possible to swivel up the rear window, 
     FIG. 5 a  shows a section along the line Va—Va in FIG. 5, 
     FIG. 5 b  shows a view of a detail of the region Vb in FIG. 5, cut in the longitudinal median plane of the vehicle, 
     FIG. 6 shows the construction of FIG. 5 during the opening of the roof, 
     FIG. 7 shows a view, similar to that of FIG. 6, as the opening of the roof has progressed further, 
     FIG. 8 shows the construction of FIG. 5 with the roof, together with the rear window in the roof, is stowed away completely, 
     FIG. 9 shows the construction of FIG. 5 with the roof closed and the rear window lowered, 
     FIG. 10 shows a view, similar to that of FIG. 9, of an alternative embodiment with an additional driving lever, 
     FIG. 10 a  shows a section along the line Xa—Xa in FIG. 10, 
     FIG. 10 b  shows a view of a detail of the upper transverse spar of the frame, approximately the region Xb in FIG. 10, cut in the longitudinal median plane of the vehicle, 
     FIG. 11 shows a view, similar to that of FIG. 5, of a further embodiment with a driving lever and swiveling lever for swiveling up the rear window, 
     FIG. 11 a  shows a section along the line Xla—Xla of FIG. 11, 
     FIG. 11 b  shows a view of a detail of approximately the region Xlb in FIG. 11, cut in the longitudinal median plane of the vehicle, 
     FIG. 12 shows an embodiment of FIG. 11 during the opening of the folding top, 
     FIG. 13 shows a view, similar to that of FIG. 12, as the opening of the folding top has progressed further, 
     FIG. 14 shows a view, similar to that of FIG. 13, with the folding top stowed completely, 
     FIG. 15 shows a view, similar to that of FIG. 11, with a partially lowered rear window, and 
     FIG. 16 shows a view, similar to that of FIG. 15, with a completely lowered rear window. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     An example of the inventive convertible vehicle  1  has a car body  2 , which is bounded at the top by a window parapet line  3  and, above this window parapet line  3 , comprises a folding roof  4 . The roof  4  is provided with a rear window  5  which, in the closed position of the roof  4 , can be shifted from a normal position, in which it closes off this roof  4  tightly towards the rear, into a lowered position. In the lowered position, the rear window  5  is essentially below the window parapet line  3 , so that the section  6  of the roof  4 , taken up by the rear window, is essentially completely open. The rear window  5  is held in a frame  7  in the normal position (FIG. 2) as well as in the lowered position (FIG.  4 ). The frame  7  is U-shaped and comprises two short side legs  8 , as well as a middle transverse leg  8   a . The frame  7  is open in the direction of the window parapet  3 . The frame  7  is firmly connected with the roof  4 , for example, by gluing and/or welding. The roof  4  may be constructed, for example, as a textile folding roof. It comprises, for example, extruded metal profiles, but can also be constructed in one piece. The rear window  5 , guided in the frame  7 , may consist of plastic or glass. Because of the firm guidance in the frame  7 , a rigid rear window  5 , optionally with heating wires and/or antennas, can be used. The guiding parts  7   a ;  29  for shifting the rear window  5  between the normal position (FIG. 2) and the lowered position (FIG. 4) are disposed in the frame  7 . 
     For this purpose, the frame  7 , in the side legs  8 , can comprise guiding parts  7   a , which are U-shaped in cross section and constructed telescopically in the form of a drawer guiding arrangement. The guiding parts  7   a  comprise a U-shaped frame section  42 , which is firmly connected with the side regions of the rear window  5 , bordering them, and can be moved up and down over sliding elements  44  relative to an outer frame section  43  (FIG. 2 a ). The frame section  42  is lowered with the rear window  5  and remains with its upper region in the outer guide, being held by the frame parts  43 . The rear window  5  can therefore be held hanging freely in the car body, even in the lowered position. The frame  7  is held at lateral levers  12 , which are connected at the one end with the car body  2 , so that they can be swiveled about a horizontal axis  13  and, at the other, guide the lower frame region  7   b  of the frame  7  over a further swiveling axis  14  and can be moved during the roof opening process, as is described in the second example. 
     In the normal position, a stop seal  45 , against which the rear window  5  is pressed (FIG. 2 b ), is provided in the region of the transverse leg  8   a  as the upper stop for the rear window  5 . Moreover, it can be seen in FIGS. 2 a  and  2   b  that the material  33  of the folding top of the textile-covered roof  4  in the example is pressed into a seal  41  or fixed at a bracket  46  of the transverse leg  8   a.    
     Pursuant to a further embodiment of the invention, which is used particularly in convertible vehicles equipped with a rear bench, the rear window  5  is held pivotably in the frame  7 . The rear window  5  can then be swiveled up with its lower end in order to overcome, in the swiveled-up position, obstacles, such as headrests or roll bars (FIGS. 5 to  7 ). Such a mobility of the rear window  5  opens up the possibility of equipping the folding top with an almost vertical rear window  5  closely behind the headrests of the rear seats. This has a positive effect on the visibility towards the rear through the cut-out  6 . A roof  4  can be realized, which runs out into two lateral end regions  9 , which protrude towards the rear and are essentially triangular in plan view. Nevertheless, the already mentioned, almost vertical rear window  5  is disposed in front of and between this end region  9 . Moreover, due to this type of roof  4 , more headspace for the rear passenger is ensured. An inclined installed position of the rear window  5  remains possible even with this form of roof. The end regions  9  are pre-stressed over tension brackets  10 , so-called fins, with respect to the car body  2 , so that, in side view, it has lines similar to those of a conventional convertible folding top with a window disposed obliquely in the end region of the folding top. As in the first example, the frame  7  is held movably over lateral levers  12 . In addition, a swiveling lever arrangement  15  engages the U-shaped guiding parts  7   a  of the frame  7  in the lower region over a swiveling axis  16 . At the other end, the swiveling lever arrangement  15  is pivotably fixed in the main bearing  17 . The swiveling lever arrangement  15  comprises a joint  18 , which connects its two levers  19 ,  20  pivotably together. The lever  19  extends from the main bearing  17  to the joint  18  and the lever  20  extends from the joint  18  to the working axis  16  at the rear window  5 . 
     In the closed position of the roof  4 , shown in FIG. 5, the rear window  5  is held with its lower end in a sealing channel with respect to the car body, so that a swiveling up is not possible in this position. For opening the roof  4  (FIGS. 6 to  8 ), initially the fins  10  are swiveled upward about the swiveling axis  11 , as a result of which the roof  4  loses its tension. During the swiveling up, the frame  7 , which stands in the closed position on the car body  2  in the region of the plane of the window parapet  3 , is at the same time swiveled upward about the lever  12  and forwards on a circular path  21 , and is moved laterally past the headrests  22  and, if necessary, past roll bars additionally disposed. If the rear window  5  would remain standing in the frame  7 , a collision with the parts named would result during the movement of the lever  12  about the swiveling axis  13 . In order to avoid this, the rear window  5  is swiveled up with respect to the frame  7  by the swiveling lever arrangement  15  during the opening of the folding top. This can be accomplished, for example, by means of hydraulic or electric driving elements, which move the lever  20  upward about the joint  18  in such a manner that an angle α results between the rear window  5  and the frame  7 . For moving the frame  7 , either a further driving mechanism is required or, particularly advantageously, the frame  7  is carried along necessarily by the swiveling motion of the fins  10  and the therefrom resulting folding kinematics of the roof  4 . 
     The swiveling up affects not only the rear window  5 , but also the guiding parts  7   a , which are U-shaped in cross section and bring about the guidance as the rear window  5  is lowered. Relative to the frame  7 , which may be constructed L-shaped in cross section, the rear window  5  is therefore swiveled up as a whole with its lower end in the direction of the arrow  39  counter to the driving direction F. On the other hand, in the region of the transverse leg  8   a  in the region of the frame  7 , the rear window  5  maintains contact with the latter. The guiding parts  7   a , enclosing the parts  42 ,  43  and  44 , are separated during the swiveling up in the direction of the arrow  39  at the parting plane  37  from a seal  32  on the frame. The rear window  5  is therefore also bordered by the guiding parts  7   a  in the swiveled up position. Furthermore, a seal  41  is provided which, with a bracket  41   a , is in contact with the material  33  of the folding top in the closed position and thus brings about a seal between the rear window  5  and the material  33  of the folding top. FIG. 5 b  shows that a deformable seal  45  is provided once again as the upper stop for the rear window. The swiveling axis  47 , about which the rear window  5  can be swiveled up, is in the upper transverse frame part  8   a  and brings about the referred to separation of the parts at the parting plane  37 . 
     During the further opening of the roof  4  (FIG.  7 ), the fins  10  are brought into a vertical position, the frame  7  is swiveled further towards the front and downwards on the circular path  21 , the opening angle α between the rear window  5  and the guiding part  7   a  bordering it is enlarged opposite the frame  7 , so that contact between the rear passengers and the rear window  5  is avoided also in this position. On the other hand, the lateral legs  8  of the frame  7 , which can be moved laterally past the headrests  22 , lies so far on the outside, that passengers have no contact with them. 
     In the position of FIG. 7, the lid of the box for the folding top, which is not shown and hinged at the rear, can be swiveled up, so that subsequently the roof  4  can be stowed in a folding top box  23 . This position is shown in FIG.  8 . The fins  10  about the swiveling axes  11 , which are guided downward during the movement, are inserted here essentially horizontally in the floor region of the box  23  for the folding top. The rear window  5  is swiveled in once again with respect to the frame  7 , so that the opening angle α is restored. The rear window  5  therefore assumes a folded-in position, during which it remains a complete component of the folded top  4  and does not require more space than the frame  7 . The swiveling back of the rear window  5  with respect to the frame  7  is brought about by the coupled swiveling motions of the lever  12  about the axis  13  and of the levers  19  and  20  about the axis in the main bearing  17  and in the joint  18 . The frame  7  then lies essentially parallel above the fins  10 . Above this frame  7 , there is a middle part  24  of the roof and a front part  25  of the roof, which, in the closed position, is supported with its front transverse end  26  on a windshield frame. As a whole, therefore, the roof  4  is folded in Z-shaped fashion. 
     Overall, therefore, a folding top arrangement is created, which ensures a separate lowering of the rear window  5  in the closed state of the roof  4 . However, when the folding top is stowed, the rear window  5  is an integral part of the folding top  4  and is stowed with the latter in the box  23 . In addition, because the rear window  5  can be swiveled up with respect to the frame  7  to avoid collisions, particularly advantageous folding kinematics are brought about and the space relationships for the rear passengers are improved. 
     In FIG. 9, the state, corresponding to that of FIG. 4, is shown for the example. In this state, the roof  4  is closed and the rear window  5  is lowered in its guiding parts  7   a  and hangs freely in the car body. 
     In accordance with a third embodiment (FIG.  10 ), the rear window  5  can be moved up and down over a driving lever  30  engaging the lower region of the rear window and held at the other end at a pivoting axis  27  in the region of the main bearing  17 . In this embodiment, pivotability of the rear window  5  is superfluous in this embodiment, since rear headrests or the like are not installed. Like the first embodiment, this one also comes into consideration for two-seater vehicles. The process of opening the folding top is similar to the last embodiment with the difference that, during the whole of the opening phase, the rear window  5  can remain parallel to the frame  7 , since there are no obstacles in the way. The rear window  5  does not have telescopic guide parts  7   a  here and, instead, is held only over sliding pieces  29  in the frame  7 , which can be constructed U-shaped in cross section here, because pivotability is not required. The up and down shifting of the rear window  5  is brought about by an electric or hydraulic driving element, which controls the swiveling of the driving lever  30  about the swiveling axis  27 . 
     Pursuant to a fourth example (FIGS. 11 to  16 ), the combination of the third example with a swiveling lever arrangement  15  is shown, which is required if obstacles, such as headrests  22 , are to be overcome during the process of opening the folding top. As in FIGS. 5 to  8 , the opening mechanism of the roof  4  is shown in FIGS. 11 to  14  and works in the same way as in the second example. With respect to FIGS. 11 to  14 , reference is therefore made completely to FIGS. 5 to  8 . 
     The only difference is that the swiveling lever  20 , which is a component of the swiveling lever arrangement  15  and serves to swivel up the rear window  5  during the opening and closing of the roof  3 , additionally represents a driving lever  30  for lowering the rear window  5  (FIGS.  15  and  16 ). Since the rear window  5  is held in the lower region in the region of the working axis  16  of the lever  20 , a traveling telescopic guide  7   a  is dispensable. Instead, the rear window  5  is held in a sliding guide  29 , which remains within the frame  7  during the lowering. When the rear window  5  is swiveled up (FIGS. 11 to  14 ), the sliding guide  29 , which may be constructed U-shaped in cross section, is swiveled along. Instead of the sliding guide  29 , a telescopic guide  7   a  can also be used in the example. However, the sliding guide  29  is easier to realize mechanically. According to the fourth example (FIG. 11 a ), the sliding guide  29  is held in the L-shaped frame  7  in order to ensure that the rear window  5  can be swiveled up along the parting plane  37  with respect to the frame  7 . Within the sliding guide  29 , a frame part  35  is held, which borders the rear window  5  laterally and can be shifted relative to the sliding guide  29 . For this purpose, a sliding path  38  is used, which is constructed as a gap between the parts  29  and  35 . An additional seal  36 , which can also be constructed in the form of the seal  41  of FIG. 5 a , is provided in order to seal the gap between the rear window  5  and the material  33  of the folding top. When the rear window  5  is swiveled up, the sliding guide  29  is swiveled along with it completely. In addition, a seal  34  is fastened with a harpoon stitch (of course, other means of fastening also come into consideration) at the sliding guide  29  and ensures that the sliding path  38  is sealed, in that the seal  34  seals the rear window  5  with respect to the sliding guide  29 . 
     The upper coupling of the rear window  5  in the region of the transverse frame part  8   a  of the frame  7  corresponds essentially to that of the example shown above in FIG. 5 b.