Removable plastic roof panel
SUMMARY OF INVENTON 
     This invention relates generally to removable plastic roof panels for motor vehicles, and deals more particularly with a relatively thin acrylic or polycarbonate plastic panel to replace the relatively rigid metal panel normally provided by the vehicle manufacturer for a rectangular sun roof opening in the vehicle. 
     The chief aim of the present invention is to provide a readily removable transparent plastic roof panel, with fittings which do not require design changes to, or the permanent attachment of, socket defining means to the vehicle&#39;s sun roof opening, the rain trench, or the vehicle headliner. 
     In motor vehicles equipped with a removable rigid metal roof panel, of the type which is adapted to be replaced by a plastic transparent roof panel, the stamped metal roof of the vehicle is so formed around the sun roof opening as to define a rain trough or trench. The vehicle headliner, that is the ceiling upholstery inside the vehicle, is generally formed of plastic to fit snugly to the underside of this rain trench. The headliner is designed by the manufacturer to define sockets for receiving the conventional fore and aft attachment means provided for this purpose on the conventional rigid metal roof panel. The plastic roof panel of the present invention also has fore and aft attachment means which mate with these sockets defined in the headliner, and in addition, are adjustable to hold the relatively flexible and resilient plastic roof panel in place. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view showing the relevant portion of a motor vehicle of the type having a removable rigid factory installed roof panel, and more particularly FIG. 1 shows a Porsche 924 with a sun roof opening of the type adapted to be fitted with an improved transparent plastic roof panel of the present invention. 
     FIG. 2 is a bottom view of the plastic roof panel illustrating in the fore and aft attachment means. 
     FIG. 3 is a sectional view taken on the line 3--3 of FIG. 1 and illustrating the fore attachment means. 
     FIG. 4 is a sectional view taken generally on the line 4--4 of FIG. 2, but drawn to a larger scale. 
    
    
     DETAILED DESCRIPTION 
     Turning now to the drawing in greater detail, FIG. 1 shows a motor vehicle of the type generally provided with a sun roof opening 10, the vehicle illustrated being a Porsche 924 of the type imported into the United States by Volkswagon of Germany. The particular type of vehicle is shown for purposes of illustration only, but it is a feature of the present invention that the factory supplied rigid metal roof panel is adapted to be replaced by a transparent plastic panel which not only serves as a window, but which is lighter in weight and more resilient than the relatively rigid metal roof panel supplied by the manufacturer. 
     FIG. 3 illustrates the sun roof opening 10 mentioned previously, the metal roof 12 of the vehicle being illustrated in FIG. 3 in vertical section. As shown in this view the metal roof 12 includes a peripherally extending rain trough or trench 14 formed integrally in the roof 12, and defining a generally upwardly open U-shaped well to receive a seal or the like, such seal being typically provided in the rigid metal roof panel supplied by the automobile manufacturer (not shown). 
     Still with reference to the conventional portion of the vehicle as provided by the automobile manufacturer, FIG. 3 illustrates, at 16b, socket defining recesses adapted to receive attachment means (not shown) associated with the conventional rigid metal roof panel (not shown) provided by the automobile manufacturer. 
     Turning now to a more detailed description of the plastic roof panel illustrated in FIG. 2, the panel itself comprises a relatively thin transparent plastic material, such as acrylic or polycarbonate or the equivalent, to provide the optical qualities desired in a sun roof type window. The panel 26 is of constant thickness as best shwn in FIG. 3 throughout its expanse and preferably includes an elastomeric seal member 28 extending peripherally around the roof panel as best shown in FIG. 2. The seal 28 is adapted to be received in the upwardly open rain trench 14. This seal is preferably secured to a metal edge trim at the periphery of the plastic roof panel 26 as best shown in FIG. 4. 
     The fore and aft attachment means 20 are illustrated in some detail in FIG. 3. The attachment means 20 comprises a depending plastic post 30 cemented to the underside of the plastic roof panel 26. An over center latch includes a bracket 32 secured to the post 30 by screws 34, 34. The bracket 32 receives a pair of pivot pins 36 and 38 for an arm 40 and link 42. One of the ends of the link 42 is pivoted at 38, and the other end of the link is pivoted at 43 to a lever 44. The lever 44 is also pivotally mounted at 45, to the arm 40 to provide a three bar over center latch geometry. 
     The arm 40 has a free end which includes an adjustable stop means 46 for engaging the recess 16b. In the latched position the attachment means 20 is provided with pivot 43 above a line between the pivots 45 and 38. 
     Finally, I also provide a metal edge trim 60 peripherally of the plastic panel. A C-shaped upper channel receives the plastic panel, and this trim 60 is of extruded aluminum to also have a downwardly open channel for receiving the elastomeric seal 28 as best shown in FIG. 4.