Abstract:
A solar cell plate for generating electric current includes a number of individual plates that can be moved in relation to one another to produce a convenient packing size.

Description:
BACKGROUND OF THE INVENTION 
   There are known mobile solar panels that are provided to supply current to garden lamps, where the garden lamps are designed in the form of battery-powered units that can be electrically connected to solar panels. 
   The known solar panels are relatively bulky so that transporting and storing them is costly and awkward. 
   SUMMARY OF THE INVENTION 
   The current invention with the features of claim  1  has the advantage that a relatively large-area solar panel can be changed from the large-area, bulky dimensions of its functional position to a small packing size for transport or for a functional position with a minimal current efficiency, and is therefore particularly reliable and easy to maneuver and is also mobile. 
   The fact that the solar panel is comprised of individual panels similar to fan slats that can be pivoted around a common pivot axis or opened up like a fan, and can be folded back into a compact position from the fanned-out position, results in a simply designed, rugged solar panel that can be quickly, easily, and reliably transported. 
   The fact that the solar panel is supported in folding fashion on a base with an inclined surface makes it possible for the solar panel to be quickly, easily, and reliably brought into an optimal angular position in which the solar panel is oriented toward the sun so that the greatest possible electrical efficiency is assured. 
   The fact that the solar panel is fastened to a podium-like housing that supports the solar panel on the front side that constitutes the top panel of the podium and has a handle on the back side makes the solar panel a compact, particularly convenient box that can be rapidly and reliably set up. 
   The fact that the housing has a plug opening in back for the plug contact of a battery pack, in particular for electric tools, allows the box with the solar panel to be used in a particularly advantageous way as a mobile, solar-powered battery-charging station for operation on construction sites that do not have a high-voltage network. 
   The fact that the housing is equipped with charging electronics on the inside that are connected to the electric plug contacts in the plug opening makes the battery-charging station particularly rugged and insensitive to shock and impact under rough transportation conditions and with hard construction site use. 
   The fact that the housing has a charge control indicator assures it of functioning reliably as a battery-charging station. 
   Because the solar cell plates, which are arranged in a stack, are electrically coupled to one another and to the electrical contacts of the plug opening by means of electrical sliding contact, the solar panel has an effective maximal size, which results from the sum of the individual surface areas of the opened up solar cell plates. 
   The fact that the housing of the solar battery-charging station has ventilation slots prevents an overheating of the electric and electronic components contained inside, in particular the charging electronics, even at high outdoor temperatures. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The current invention will be explained in detail below in conjunction with an exemplary embodiment and the accompanying drawings. 
       FIG. 1  shows a three-dimensional side view of the solar battery-charging station, 
       FIG. 2  shows the solar battery-charging station from the left, 
       FIG. 3  shows the solar battery-charging station from behind, 
       FIG. 4  shows the solar battery-charging station from underneath, and 
       FIG. 5  shows the front view of the solar battery-charging station, with the solar cell plates spread out in the shape of a fan. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1  is a three-dimensional view of the solar battery-charging station, with a stack  16  of solar cell plates  20  folded into the compact position, the uppermost solar cell plate of which is exposed, can be activated by light, and, like the remaining solar cell plates, is supported so that it can pivot around a swivel pin  22 . The individual solar cell plates  20  can be moved independently of on another around the swivel pin  22 , but are electrically connected to one another. They have identical dimensions and are sized so that after being spread out by pivoting around the swivel pin  22  in the manner shown in  FIG. 5 , they form a semicircular solar panel surface, which converts incident sunlight into electric current in proportion to its surface area. 
   The stack  16  of solar cell plates  20  is situated on an inclined surface  24  of the housing  12 , which surface is similar to the top of a podium. The base  14  of the housing  12  can be securely placed on any surface. 
   In order to spread out, the uppermost solar cell plate  20  is pivoted in relation to the symmetry axis  18 , all the way to the right or left while the remaining solar cell plates  20  axially adjacent to the uppermost one are “fanned out” 0  to the left or right, describing a semicircle. The inside of the housing  12  contains electrical connecting means and electronic elements, not shown, that are usually provided in connection with battery-charging units. The housing  12  has a handle  28  in back, which is designed in the form of a spade handle. 
     FIG. 2  shows the details explained above in connection with  FIG. 1 , but no further mention of these details is required.  FIG. 2  shows the position of the pivot axis  23  and of the swivel pin  22 . It is also clear that the stack  16  is comprised of seven separate, identically designed solar cell plates  20 . 
     FIG. 3  shows the back of the solar battery-charging station  10 , where the back of the inclined surface  24  and of the housing  12  can be seen, as well as the design of the handle  28 ; a plug opening  30  is also shown, into which is plugged the plug terminal of a battery pack of the kind used for battery-operated hand-held power tools. Ventilation slots  32  are also shown, as well as a charge control indicator  26  that indicates the charge state of a battery pack when one is plugged in. 
     FIG. 4  shows the underside of the solar battery-charging station and the design of the handle  28  with a grasping opening  34 . 
     FIG. 5  shows the front view of the solar battery-charging station  10 ; in addition to the details mentioned above, which are not discussed again here,  FIG. 5  particularly shows the seven solar cell plates  20 , which are electrically connected to one another, spread out like a fan. 
   On each solar cell plate, close to the swivel pin  22 , the figure also shows a slip ring contact  36  via which the individual solar cell plates are electrically coupled to one another like links in a chain. This produces a series connection of the individual solar cell plates so that a charging current is present at the plug opening or at the charging terminal for battery packs and the intensity of this charging current is proportional to the total surface area of all seven solar cell plates. 
   If the solar battery-charging station according to  FIG. 1  is folded together, then only a minimal charging current is present, which is proportional to the surface area of the top solar cell plate  20 . 
   On their front side or top, the solar cell plates  20  have a light-converting layer, which feeds into a common electrical contact point. The back side, which is comprised of a mechanically stable substrate, is spaced apart from the neighboring solar cell plate  20  by an air gap to prevent the light-converting layer from being scratched when the stack  16  is spread out or folded together. 
   The electrical contact point is disposed at the bottom end of each solar cell plate  20  and constitutes a slip ring contact  36  there. On the front side, this slip ring contact is embodied in the form of an arc-shaped connecting link and on the back side, it is embodied in the form of an electrically conductive protrusion. Thus, each protrusion of a solar cell plate  20  engages in the arc-shaped connecting link of a neighboring solar cell plate  20  disposed underneath it in the stack  16 .