Abstract:
A loading system for a cargo space of a motor vehicle, such as a passenger vehicle. The loading system includes a pull-out cargo floor, a guide system for longitudinally moving the cargo floor from a rest position into an extended position projecting out of the cargo space. The guide system, in the area of the end that is extended out of the cargo space, can be upwardly pivoted with respect to the cargo space while the opposite end area is vertically fixed with respect to the cargo space.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention:  
           [0002]    The present invention is directed to a loading system for a cargo space of a motor vehicle, such as a passenger vehicle.  
           [0003]    2. Description of the Prior Art:  
           [0004]    A conventional loading system for a passenger vehicle is known from German Utility Model DE 296 08 955 U1, whereby a cargo floor is supported to be removable in a horizontal direction in a horizontally aligned frame which can be raised parallel to the motor vehicle roof by means of a scissors-type mechanism driven by an electric motor.  
           [0005]    Another generic loading system for a passenger vehicle is known from published German Patent Application DE 197 31 324 A1, whereby a cargo floor is supported to be removable in the horizontal direction by rollers along support rails. In order to raise the cargo floor from a lowered rest position to an extended state over a loading edge, the support rails can be vertically displaced parallel to the motor vehicle bottom via two parallelogram rods by means of an adjustment cylinder, whereby the cargo floor can then be pulled out in the raised position.  
           [0006]    Published German Patent Application DE 196 07 899 A1 discloses a conventional prior art loading system for an ambulance and includes a frame, and a treatment table. The treatment table, which can be pulled out to the rear, is movably supported, can be raised or lowered via two pivotally mounted support arms, both parallel to the vehicle bottom via an adjustment cylinder, and also can be pivoted about an axis which runs in the transverse direction of the motor vehicle.  
           [0007]    The disadvantage in each of these known loading systems is that the lifting means for a cargo floor in the design of the loading system, for practical loads, must be made relatively stable and thus costly.  
           [0008]    German Patent Publication DE 197 49 158 A1 discloses another conventional loading system for a passenger vehicle in which the cargo floor can be pulled out in the horizontal direction parallel to the vehicle bottom on several rollers mounted on the vehicle. The disadvantage in this vertically fixed loading system is the fact that, in the presence of the loading edge, the entire loading space of the motor vehicle cannot be used.  
         SUMMARY OF THE INVENTION  
         [0009]    In view of the foregoing, it is a primary object of the present invention to provide a loading system for a cargo space of a motor vehicle, such as a passenger vehicle, in which a cargo floor can be pulled out, and further including a guide system for the cargo floor designed such that it can be made simple and economical, on the one hand, and on the other, even when a loading edge is present, as little cargo space as possible is lost.  
           [0010]    These and other objects are achieved in accordance with the present invention by a loading system including a pull-out cargo floor movably supported with respect to the cargo space via a guide system, whereby the guide system, in a withdrawal-side area, can be raised with respect to the cargo space via an actuatable lifting mechanism before the cargo floor is pulled out of a rest position over a loading edge and is made stationary in the vehicle-side area with respect to the motor vehicle body. The present invention is advantageous because the guide system can only be raised in the withdrawal-side area with respect to the motor vehicle body, the corresponding lifting mechanism can be made relatively simple and economical even for large loads, while still provisions are made for a certain vertical adjustability in order to better enable use of the cargo space than in a vertically-fixed cargo floor when a loading edge is present. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0011]    [0011]FIG. 1 is a schematic side view of a first embodiment of a loading system in accordance with the present invention in a rest position;  
         [0012]    [0012]FIG. 2 shows the loading system from FIG. 1 in a partially extended state;  
         [0013]    [0013]FIG. 3 is a schematic side view of a second embodiment of a loading system in accordance with the present invention in a rest position;  
         [0014]    [0014]FIG. 4 shows the loading system from FIG. 3 in a partially extended state;  
         [0015]    FIGS.  5  is a schematic side view of a third embodiment of a loading system in accordance with the present invention in a rest position;  
         [0016]    [0016]FIG. 6 shows the loading system from FIG. 5 in a partially extended state;  
         [0017]    [0017]FIG. 7 is a schematic perspective of a lifting mechanism for use in the loading systems in accordance with the present invention in a raised state; and  
         [0018]    [0018]FIG. 8 is a perspective view of a vehicle equipped with the loading system in accordance with the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0019]    [0019]FIGS. 1 &amp; 2 show a first embodiment of a loading system in accordance with the present invention that includes a cargo floor  10  movably supported to be pulled outwardly of the rear cargo space of a motor vehicle via a guide system  12 . A rear section of the system  12  includes a lifting means  14  which, in the rest position shown in FIG. 1, supports a rear end of the cargo floor  10  by way of a roller system  16 . A front section of the system  12  includes, at the vehicle-side areas, a guide element  18  which extends longitudinally horizontally and which is fixedly connected to a floor  20  of the cargo space, and preferably, is formed in the shaped of a guide rod. A sliding element  22  is pivotally connected to the cargo floor  10  and is movably supported along the guide rod  18 . Preferably, the sliding element  22  is guided along the guide rod  22  by way of a linear bearing system formed of linear guide bushes or linear roller bearing bushes.  
         [0020]    In the rest position when not pulled out in the cargo space of the vehicle, which is shown in FIG. 1, the cargo floor  10  is in essentially parallel alignment to the floor  20  of the cargo space, the top edge of the cargo floor  10  lying in a plane below the top edge of the loading edge  24  which terminates the cargo space and the floor  20  thereof to the rear. For loading or unloading the cargo space, the roller system  16  is lifted upward by the lifting means  14  to a level of the top edge of the loading edge  24  so that accordingly the lower edge of the cargo floor  10  is raised above the level of the loading edge. Finally, in this position, the cargo floor  10  can be pulled out to the rear (to the left in the figures), the cargo floor  10  moving over the roller system  16  and the sliding element  22  sliding forward on the guide rod  18 . FIG. 2 shows an intermediate position between the rest position which is shown in FIG. 1 and a position with the cargo floor  10  completely pulled out. In the extended state, the cargo floor  10  can be loaded with a load which by reversal of the above described sequences can be moved into the cargo space of the motor vehicle.  
         [0021]    [0021]FIG. 7 shows an embodiment of a lifting means  14  and includes a scissors-type mechanism with a trapezoidal spindle  26  driven by an electric motor  28  into rotational motion. The lifting means  14  also include two articulated lever pairs  30 ,  32  arranged symmetrically to one another. Disposed between each of the articulated lever pair  30 ,  32  is a pin  34 ,  36  in which a spindle  26  fits. The articulated lever pairs  30 ,  32  are each coupled at respective ends to an upper profile  40  and a lower profile  42 . The lower profile  42  is mounted to the motor vehicle floor, while the upper profile  40  carries the roller system  16  (not shown in FIG. 7). The motor  28  and the spindle  26  are supported by a carrier  44  which is fixedly connected to the pin  34 , while a distal end of the pin  36  is guided in an elongated slot  46  in the carrier  44 . By way of the described scissors-type system, the rotary motion of the spindle  26  is converted into a vertical adjustment of the upper profile  40  with respect to the lower profile  42 , and thus, the roller system  16  moves vertically upward with respect to the bottom floor  20  of the cargo space. Preferably, the lifting means  14  is designed for loads up to at least 600 kg. Because the lifting means  14  is required to lift and lower only an end of the cargo floor  10  and not the entire cargo floor  10 , the lifting means  14  can be designed relatively economically for loads of this magnitude.  
         [0022]    The trapezoidal spindle  26  runs in a transverse direction of the motor vehicle, i.e., transversely to the direction in which the cargo floor  10  is pulled out. On the other side of the cargo floor  10 , a second lifting means  14 , which corresponds to the one shown in FIG. 7, is arranged symmetrically to the first lifting means  14 . The two trapezoidal spindles  26  can each be driven via its own electric motor or a common electric motor. Alternatively to the trapezoidal spindles, compressively-stiff drive cables, as used for the actuation of sliding motor vehicle roofs, can be utilized.  
         [0023]    As shown in FIG. 8, the cargo floor  10  can be pulled outward or retracted manually via a corresponding handle  32 , or the cargo floor  10  can be moved electrically using an electric motor  30  (see FIG. 4) which drives a pinion which engages two compressively stiff drive cables  31  which laterally engage the vehicle-side end of the cargo floor  10  or on its sliding element  122 . These drive devices can be made similarly to the cover of an openable motor vehicle roof. In doing so, there can be a common electric motor  30  for two drive cables  31 , or, laterally on the back end of the cargo floor  10 , each can have its own electric motor. Alternatively, every embodiment can include a one-sided drive when provisions are made for guiding the cargo floor  10  without tilting.  
         [0024]    In the embodiment shown in FIGS. 1 and 2, with a horizontally running guide rod  18 , the cargo floor  10  can be aligned horizontally in the rest position according to FIG. 1, but it is tilted relative to horizontal in the pulled-out state, as shown in FIG. 2. This tilting can be reduced by the guide rod  18  not being horizontal, but rising to the rear in the direction of extension of the cargo floor  10  according to the embodiment shown in FIGS. 3 &amp; 4, and, by lowering the front end of the guide rod  18  relative to the position shown in FIG. 1 and  2 . By a corresponding extension of the sliding element  122 , this lowering for the rest position can be balanced so that horizontal alignment of the cargo floor  10  is possible (see FIG. 3).  
         [0025]    In the extended state shown in FIG. 4, the extension of the sliding element  122 , in interplay with the tilt of the guide rod  18 , results in the cargo floor  10  being less strongly inclined relative to the horizontal when extended. Greater reduction of the tilt relative to the horizontal in the extended state can be achieved by the back end of the guide rod  18  being placed higher and/or the sliding element  122  being extended upward so that the front end of the cargo floor, in the rest position, is above the level of the back end, i.e., is oriented descending to the rear.  
         [0026]    [0026]FIGS. 5 &amp; 6 show an alternative embodiment of the invention in which a guide system  212  for the cargo floor  10  is formed using a single guide element  250  which is pivotally mounted, but vertically fixed, on a vehicle-mounted bearing  252  in a front area and is supported in a rear area by the lifting means  14 . As shown in FIG. 5, the guide system  212  is made such that a front bearing point of the guide element  250  lies on the bearing  252  in a plane above the level of the support point on the lifting means  14  so that the cargo floor  10  is tilted downward to the rear of the cargo area of the motor vehicle with respect to the horizontal. This has the advantage that in a raised, extended position of the cargo floor  10  (see FIG. 6), the downward tilt of the cargo floor  10  relative to the horizontal is less than would be the case for the guide element  250  which is oriented horizontally in the rest position.  
         [0027]    Of course in this one-piece guide system embodiment, a horizontal alignment in the rest position is possible, as is the case in the embodiments shown in FIGS.  1 - 3 . In addition, the guide element  250  can be a straight guide rail, guide rod or the like (a respective one of these guide elements being located on each side of the cargo floor  10 ), but embodiments are also possible in which the guide element  250  is formed by a frame which extends under essentially the entire cargo floor  10 .