embodiments of the invention are directed to a grill for cooking food outdoors . the grill advantageously allows for cooking over open fires like campfires or for cooking using a fuel supplied to a fuel tray such as charcoal provided to a charcoal tray . while the description that follows sometimes makes reference to charcoal specifically , it is to be understood that this is done merely by way of illustration and that alternative fuels may be supplied to the fuel tray in alternative embodiments , such as various charcoal substitutes that are known in the art . while many such charcoal substitutes are solid , the invention may also be used with liquid charcoal substitutes that have been developed . the fuel tray is coupled mechanically with a grilling surface such that at least one of the fuel tray and grilling surface may be slidably moved to achieve at least two positions : a first position in which the fuel tray is disposed substantially beneath the grilling surface and a second position in which at least a portion of the fuel tray is not beneath the grilling surface . it is noted that such relative slidable movement may be achieved with a substantially fixed grilling surface and moveable fuel tray , with a substantially fixed fuel tray and moveable grilling , or with a moveable fuel tray and moveable grilling surface . it is generally expected that cooking of food takes place when the fuel tray is in the first position , although cooking may also be accomplished in various intermediate positions accessible by the sliding mechanism so that only a portion of the grilling surface is heated . in one particular embodiment , the second position comprises a position in which no portion of the fuel tray is beneath the grilling surface . such a second position advantageously enables the heat source for cooking to be displaced substantially entirely from the grilling surface . this allows greater control over the application of cooking heat , may avoid burning food , permits prompt response to observed cooking conditions , and allows other food preparations to be made substantially without the application of heat to the grilling surface . in some embodiments , the grill may be provided in a pre - assembled form , but in other embodiments , the grill may be provided as a kit that may be assembled and disassembled as appropriate , thereby increasing the portability of the grill . the invention may be understood with reference to fig1 a - 9b , which provide various views of the grill . the following description simultaneously references the various views , some of which are more illustrative for particular features . the isometric views of fig1 a and 1b respectively show the assembled grill 100 in the open and closed positions . the grill 100 generally comprises a grilling surface 104 and a fuel tray 108 , each of which is composed of a material such as metal suitable to withstand normal cooking temperatures . the grilling surface 104 is shown as substantially flat , with a latticework structure that promotes the direct transfer of heat to food placed on the grilling surface 104 , but may more generally have arcuate or other shapes . for example , in some alternative embodiments , the grilling surface 104 may comprise a plurality of distinct levels that enable food to be subject to different heat levels . merely by way of example , such distinct levels might provide for a “ cooking level ,” a “ warming level ,” and the like . it is also emphasized that the latticework structure is provided by way of illustration ; more generally , the grilling surface 104 may comprise and structure effective to promote heat from an underlying heat source to food placed on the grilling surface . this might include a series of parallel or nonparallel rods , a thin flat sheet of metal , or other structures . when the grill 100 is in the open position shown in fig1 a or when the fuel tray 108 has been removed , the grilling surface 104 may be disposed directly over an open fire such as a campfire that provides the source of heat . when the grill 100 is in the closed position shown in fig1 b , the grilling surface 104 is disposed over the fuel tray 108 , with the burning of fuel in the fuel tray 108 providing the source of heat . the grilling surface 104 may comprise one or more handles 112 to facilitate movement or carrying of the structure . similarly , the fuel tray 108 may comprise one or more handles 116 to facilitate movement or carrying of the fuel tray . when the structure is disassembled , the handles 112 and 116 may be especially convenient for moving the grilling surface 104 and fuel tray 108 separately . the grill 100 is supported by a plurality of posts 124 . while the drawings show a structure in which four posts 124 are provided , this is also exemplary , and alternative embodiments may use a different number of posts 124 . the structure of the posts shown in the drawing is exemplary , with each of the posts including a beveled end 148 suitable for insertion into the ground or other pliable surface and a flared end 152 suitable to receive the force of a mallet or other tool to aid in insertion of the posts 124 into the ground or other pliable surface . such a structure is particularly suitable for deployments of the grill 100 in environments like campsites , backyards , or the like , where the grill 100 is to be used over the ground . in other embodiments , such features as the beveled ends 148 and flared ends 152 may be omitted or substituted with other characteristics . for example , structures in which the beveled ends 148 are replaced with flat ends , perhaps including low - friction caps made of rubber or a similar material , may be especially suitable for deployment of the grill 100 in environments like parking lots near sporting events , on concrete sidewalks , on wooden decks , or the like . in some instances , assembly kits for the grill 100 may include a plurality of sets of posts to enable the grill to be used in different such environments . as best shown in the front and rear end views of fig4 a and 4b respectively , each of the posts 124 may include depth indicators 144 . when provided at a uniform distance from the beveled ends 148 , as indicated by reference line 140 , the depth indicators 144 allow the posts 124 to be disposed in the ground at a substantially uniform depth , ensuring that the grilling surface 104 is substantially horizontal . while the illustration shows only a single depth indicator 144 on each post 124 , multiple depth indicators may be provided in alternative embodiments , enabling the grill 100 to be disposed over the ground at different substantially horizontal heights . the posts 124 are coupled with a plurality rails 120 . while the drawings show two rails 120 , it is understood that any plural number of rails 120 may be used in alternative embodiments . the grilling surface 104 comprises a structure with holes through which the rails 120 extend . the rails 120 may be affixed to the posts 124 using any suitable mechanism , one example of which is shown in detail in fig5 . in this example , which is used to affix the rails 120 to the front posts 124 - 1 and 124 - 2 , a plurality of spaced - apart protrusions 136 are provided at an end of the rail 120 , enabling the intermediate portion of the rail 120 to be accepted by shaped receiving members 128 coupled to respective posts 124 . while it is possible to use the same mechanism to affix the rails 120 to the rear posts 124 - 3 and 124 - 4 , the drawings illustrate an alternative affixation mechanism in detail in fig7 that comprises protrusions 132 extending from the respective posts 124 and including a hole sized for receipt of the respective rails 120 . while embodiments may be provided in which the same affixation mechanism is used for all posts 124 , the use of different affixation mechanisms as illustrated in the drawings advantageously simplifies assembly of the grill 100 . specifically , the affixation mechanism shown in fig7 provides greater structural support to the grill 100 while the affixation mechanism shown in fig5 simplifies assembly of the grill 100 over a campfire or location . the drawings also show the inclusion of the plurality of spaced - apart protrusions 136 in fig5 and the protrusions 132 in fig7 . generally , these structures are provided at corresponding positions on the posts 124 to ensure deployment of the grill 100 achieves a horizontal grilling surface 104 . in combination with the depth indicators 144 , the inclusion of a plurality of such structures on each post 124 enables assembly to be effected with the grilling surface 104 at different heights above the ground or other surface . in alternative embodiments , only a single structure is provided with each post 124 or a plurality of structures greater than two is provided . the detail of fig6 shows that the grilling surface 104 may comprise structural members 172 and 176 , and that the latticework or other structure 168 may be spot welded 180 to such structural members . detail views of the fuel tray 108 visible in fig1 a , 1 b , 2 , 3 , and 4 are provided in fig8 a - 8d . fig8 a and 8b provide end views with fig8 a showing the fuel tray 108 itself and support frame 138 separately and fig8 b showing them together . the support frame 138 includes front protrusions 134 , each of which includes a hole for receiving respective ones of the rails 120 . fig8 c shows a top view of the fuel tray 108 and support frame 138 , which also includes rear protrusions 160 shown in fig8 d . the rear protrusions 160 also include holes for receiving respective ones of the rails 120 . while the front protrusions 134 may be generally flat so that they substantially abut the front posts 124 - 1 and 124 - 2 when the grill 100 is in the open position shown in fig1 a , the rear protrusions 160 may be jogged , with a top of the rear protrusions disposed within the structure defining the grilling surface 108 . such a configuration provides a stopping point when the fuel tray 108 is slid along the rails 120 that defines the open position . fig9 a provides an isometric illustration of the fuel tray 108 in which the structure of the rear protrusions 160 is evident , as well as showing the presence of spot welds 180 at the bottom of the fuel tray 108 , used to hold the fuel tray 108 in position . the side view of fig9 b further illustrates the mechanism for holding the fuel tray 108 in position , also showing the presence of briquettes 184 within the fuel tray 108 to provide fuel . having described several embodiments , it will be recognized by those of skill in the art that various modifications , alternative constructions , and equivalents may be used without departing from the spirit of the invention . for example , the illustrative embodiments described above describe particular sliding mechanisms , but this is not intended to be limiting . more generally , and as will be understood by those of skill in the art , any suitable sliding mechanism may be used , including metal - to - metal low - friction movement , rolling mechanisms mounten on the grilling surface or frame , an arrangement of shaft - collar connections , and the like . accordingly , the above description should not be taken as limiting the scope of the invention , which is defined in the following claims .
a portable cooking grill includes upright posts , rails , a grilling surface , and a fuel tray . each rail couples a pair of the upright posts . the grilling surface is coupled with the rails and supports food for cooking . the fuel tray is coupled with the rails and receives a volume of fuel . the grilling surface and the fuel tray slide relative to each other to allow them to be relatively moved into distinct positions . in one position , the fuel tray is beneath the grilling surface . in another position , at least a portion of the fuel tray is not beneath the grilling surface .