a grill 10 is illustrated in fig1 . the grill 10 is an example of various different styles of grills which are employed for the grilling of various foodstuffs . grill 10 has a bowl 12 which is carried on suitable supports . in this case , the supports comprise legs 14 , 16 and 18 . legs 14 and 16 are provided with wheels 20 and 22 mounted on axle 24 . by this construction , the grill 10 may be moved into place on its wheels by grasp of handle 26 . bowl 12 has a heat source therein . quite often , the heat source is burning charcoal . in some grills , a gas flame heats ceramic material which acts as a radiant and convective heat source . sometimes , the heat source is electric . in any event , grate 28 is mounted in the bowl . conventionally , the grate 28 is mounted on a flange or a series of angle stops mounted around the interior of the bowl just below the top thereof . a cover may be provided . while a circular bowl is illustrated and its appearance is one suitable for use with charcoal as a heat source , it is understood that other configurations and heat sources for the grill are grills suitable for use with the grate 28 of this invention . grate 28 has two half - circular grate frames 30 and 32 , see fig2 . the grate frames 30 and 32 overlap each other and are conveniently formed with flats and pivot bosses . pivot bosses 34 and 36 are illustrated on grate frame 30 , while pivot bosses 38 and 40 are illustrated on grate frame 32 , see fig2 and 4 . the pivot bosses are respectively provided with pivot openings . pivot pins 42 and 44 are respectively engaged in the pivot openings in pivot bosses 34 and 38 and in the pivot openings in pivot bosses 36 and 40 , see fig4 . this construction permits the grate frames 30 and 32 to move from a flat , planar position , as shown in fig1 and 5 , to a folded position , shown in fig4 and 6 . to limit the pivotability and to limit the hinging to the planar position in one direction of relative rotation , stop flanges 46 and 48 are respectively formed on pivot bosses 38 and 40 . this construction and the manner in which the stop flanges limit the relative rotation of the grate frames to the planar position are shown in fig5 and 6 . crossbars 50 and 52 are attached to the grate frames 30 and 32 , respectively , adjacent their hinges . as seen in fig2 the combination of the two grate frames hinge together form a circular grate 28 , and the crossbars 50 and 52 form chords close together across the circular grate frame . a plurality of grate bars is secured to the grate frames and extend to and lie on top of the crossbars . for example , grate bar 54 is attached to the grate frame 30 on its outer end and lies on top of crossbar 50 on its inner end , see fig2 and 3 . a sufficient plurality of grate bars , such as grate bar 54 , are spaced from each other and parallel to each other and substantially perpendicular to the crossbars 50 and 52 , as seen in fig2 . these grate bars are sufficiently close that there is little risk of food materials falling between , but there is substantial room for radiation and convection therebetween . the covers for these grate bars are throwaway tubes . one of the covers is specifically shown and is identified as cover 56 in fig2 and 4 . cover 56 is an example of all the covers employed , one for each grate bar . the cover 56 and its companions are made of material which does not harm the food which lies thereagainst , is of a material which is sufficiently economic so that it can be thrown away after one usage , and is sufficiently temperature - resistant so that it does not significantly melt or deform in the heat of cooking . an aluminum foil tube is suitable and is the preferred material . cover 56 is in the form of a tube which has an interior opening 58 , which is sufficiently large to receive the grate bar . the length of the cover 56 is sufficient to reach substantially from the crossbar to the grate frame , as seen in fig2 . for installation and removal of the covers from the grate bars , the grate is folded , as shown in fig4 . this exposes the free ends of the grate bars . the covers 56 are slipped thereon , as shown for the exploded position of the cover 56 in fig4 . if necessary , the grate bars can be pushed slightly away from the crossbars during the installation . the fact that the grate bars normally lie against the crossbars retains the covers in place . when all of the covers are installed , the grate is folded flat , as shown in fig2 and is placed upon the grill , as shown in fig1 . after the covered grill grate is used , it can be removed , folded to the position of fig4 and the old covers 56 can be removed and disposed of while new covers are put in place . in this way , the grill grate is replaced to maintain the grill grate clean and ready for use . a second preferred embodiment of the grill grate and its cover is generally indicated at 60 in fig7 . the grate 60 has two grate frames 62 and 64 , which are the same size and shape as the grate frames 30 and 32 . the grate frames 60 and 62 are pivoted together on hinges 66 and 68 of the same construction as the flattened pivot bosses and stop flanges described with respect to fig5 and 6 . the important difference of the grate 60 is that its grate bars are all secured at one end to the grate frame 62 . for example , grate bar 70 is secured to grate frame 62 . when the grate frame 64 is hinged into planar position , as shown in fig6 the free ends of the grate bars lie on top of the grate frame 64 , as shown . when the grate frame 64 is swung down on its hinged pivots , the right ends of the grate bars are free and unobstructed . covers , such as cover 72 on grate bar 70 , may then be slid into position when clean and out of position when used so as to provide ready access to the grate bars for replacement of the covers . again , the covers are preferably of lightweight aluminum tubing so that they resist the heat , can be thrown away , and do not adversely affect the food cooked thereon . the grate bars 70 are parallel to each other and are substantially perpendicular to the axis through the hinges . the grate bars are spaced from each other suitably to support food , but permit passage of radiation and convective heat therebetween . the third preferred embodiment of the grill grate and cover of this invention is generally indicated at 74 in fig8 and 9 . the grate 74 is very similar to the grate 60 , except for the fact that the grate frames form a rectangular grate and the grate bars are of equal length . grate frame 76 is formed of main bar 78 and side bars 80 and 82 . grate frame 84 is formed of main bar 86 and side bars 88 and 90 . side bar 88 is hinged to side bar 80 at hinge 92 , while side bar 90 is pivoted to side bar 82 at hinge 94 . the hinges are the same as those shown in fig5 and 6 , including stops to limit the hinging of main bar 86 up from the depressed position shown in fig9 to the planar position shown in fig8 . each of the grate bars of a plurality of parallel grate bars is attached to the main bar 78 . as is seen in fig9 grate bar 96 is secured to main bar 78 . as seen in fig8 when the grate frame 84 is in the raised position , the outer end of grate bar 96 lies on top of main bar 86 . when the main bar 86 is in its lowered position , the end of the grate bar 96 is free , as seen in fig9 . when free , the cover 98 may be easily slid onto the grate bar 96 . when the main bar 86 is in its raised position , it supports the outer end of the grate bar 96 and retains the cover 98 in place . when the main bar 86 is down , a cover is placed on each of the grate bars and then the main bar is raised so that the grate 74 can be put into a grill and used . after use , the grate 74 is removed from the grill , the main bar 86 is lowered , and the covers 98 are removed . new covers are placed on the grate bars , and then the main bar 86 is raised for reuse . each of the grate bars and other bars of the grate are conveniently of solid rod of circular section . attachment is conveniently made by spot - welding . often such grates are chrome - plated . in this way , a grill grate is created and covers are furnished for the grate bars so that cleanliness in food preparation and easy cleanup are provided . this invention has been described in its presently contemplated best modes , and it is clear that it is susceptible to numerous modifications , modes and embodiments within the ability of those skilled in the art and without the exercise of the inventive faculty . accordingly , the scope of this invention is defined by the scope of the following claims .
in grilling foods , a grate is placed over the heat source . foods are placed on the grate for cooking . the grill grate cover of this invention comprises disposable , heat - proof tubes which removably slip onto the grate bars . after use , they are removed , thrown away , and replaced .