the invention , in preferred embodiments , is illustrated by the accompanying drawings , in which : fig1 is a side view , partially cut away , showing a four - tier bank of animal cages and , partially , the animal food tray of the present invention . fig2 is an end view , partially cut away , of a four - tier bank of animal cages arranged in side - by - side juxtaposition with the animal feed tray of the present invention located therebetween . fig2 shows the same bank of animal cages as does fig1 . fig3 and 4 show a three - tier bank of animal cages , arranged in side - by - side juxtaposition , and adapted to contain larger animals , with the animal feed tray of the invention located between the side - by - side juxtaposed animal cages . fig3 shows a partially cut away side view and fig4 shows a partially cut away end view of a slightly different embodiment . fig5 shows a partially cut away perspective view of another multiple - compartment animal cage , arranged in juxtaposition to a second unit of the same type , with the animal feed tray of the invention located therebetween and illustrated in the process of being withdrawn for purposes of instantaneous emptying of the animal feed tray . fig6 is a side elevation of the animal feed tray of the invention . fig7 is a front view of the animal feed tray of the invention , and , fig8 is a front view of another embodiment of the animal feed tray of the present invention . reference is now made to the accompanying drawings for a better understanding of the invention , wherein all of the parts are numbered and wherein the same numbers are used to refer to the animal feed tray of the present invention throughout , corresponding parts otherwise being numbered in the one hundred ( 100 ) series in fig1 and 2 , in the two hundred ( 200 ) series in fig3 and 4 , and in the three hundred ( 300 ) series in fig5 . according to a preferred form of the invention , a bank of animal cages is shown generally in fig1 and 5 at c . in fig1 and 2 , the cages have a small mesh , illustratively a u . s . mesh size no . 2 , for purposes of holding nibbling animals such as mice . a mouse cage , due to its mesh size , will hold or retain any food cube which is larger than approximately 0 . 3 inch on its largest diameter . in fig3 and 4 , it will be noted that the mesh size is larger . this is illustratively mesh size no . 3 and the cages are illustratively adapted to contain gnawing animals such as rats , rabbits , guinea pigs , hamsters , or the like . a cage having a u . s . mesh size no . 3 screen will hold or retain any food cube which is larger than 1 . 5 inches on its largest diameter , the figure being approximate . in fig1 and 2 , a four - tier bank of cages is shown , the cages being arranged in tiers or layers of two , each layer or tier comprising two longitudinally juxtaposed animal cages in spaced relationship with a channel or opening therebetween . referring now to fig1 and 2 , the multiple cage units are there illustrated at 100 , the juxtaposed layers or tiers of two being stacked upon each other and the longitudinally juxtaposed animal cages being held in fixed spaced relationship to each other by end brackets 103 secured to both of the juxtaposed multiple cage units at their upper front and rear edges . as shown , these juxtaposed multiple cage units are also held in spaced relationship by inverted &# 34 ; u &# 34 ; brackets 104 , upon which the bottom 400 of the instantaneously emptiable animal feed tray of the present invention rides . although shown in the drawing as an inverted &# 34 ; u &# 34 ; connecting the two juxtaposed animal cages , this spacer constituting a track upon which the bottom 400 of the feed tray may slide can take other forms and need not be in the form of an inverted &# 34 ; u &# 34 ; bracket . neither must it be secured to the two juxtaposed animal cages . it may , for example , take the form of two &# 34 ; v &# 34 ; brackets , one on each of the adjacent animal cages , or it may in some cases even be absent , the feed tray of the invention then slidably engaging the top of the next lower tier of cages or the surface of a supporting tray or sheet upon which the adjacent cages may rest , although the presence of an inverted &# 34 ; u &# 34 ; bracket , two &# 34 ; v &# 34 ; brackets , or other brackets constituting a slide with which the feed tray of the invention may slidably engage , certainly constitutes a preferred embodiment of the invention . as shown , sheetform vertical members 401 are present as an essential part of the animal tray of the invention , and these are stabilized by struts or support members 402 . a handle 403 is secured to the outer end plate 401 of the feed tray , for ready withdrawal of the feed tray when it is desired to empty the same . also , as shown , the cages comprise the usual screen walls 101 , dividers 102 , and , in the lower portion of fig1 the animal tray of the present invention is shown in partially withdrawn position , with the screen on the other side of the multi - compartment cage unit being visible in the cutaway section , together with the rear end of the animal feed tray which is being withdrawn . bar animal food f , as seen in fig1 having dimensions so as not to pass through the screen having the mesh size of 101 in fig1 and 2 , is shown floating away below the animal feed tray in its partially withdrawn position . referring now to fig3 and 4 , the same elements and members are visible , with the mesh size of the screen 201 and the individual particle of animal food f having somewhat larger dimensions , the cages being suitable for containment of larger animals . three tiers or layers of cages are shown , and each layer comprises two animal cages in side - by - side or longitudinal juxtaposition , again secured together at their upper front and rear edges by brackets 203 and having a spacer bracket 204 therebetween and secured to both of the juxtaposed animal cages , thereby constituting a track upon which the edges 405 , 406 of the bottom 400 of the animal feed tray of the invention can ride . referring now to fig5 only one single tier comprising two multi - compartment cages arranged in side - by - side juxtaposition is here depicted . the walls of the cages comprise screen 301 of suitable mesh size and the multi - unit cages include individual compartment dividers 302 . the screen on the side of the animal cage fronting the space between the juxtaposed cage units is shown at 301a . brackets 303 at the upper front and rear edges of the cages support the two units in juxtaposition in their side - by - side relationship , and further brackets or edge bars 303 located at the adjacent top edges of the cages provide strengthening support in the usual manner to the individual cages and to the juxtaposed unit of two cages . as the feed tray of the invention is withdrawn from the recess or space between the two juxtaposed animal cages , it rides upon the inverted &# 34 ; u &# 34 ; bracket ( not shown ) within the space between the two multi - cage units comprising the dual unit 300 . the bottom 400 of the animal feed tray is in the form of an inverted &# 34 ; v &# 34 ;, as shown , and its lower edges 405 , 406 slidably engage the bracket internally of the recess between the two multi - cage units . the vertical sheetform members 401 , to the front one of which is secured handle 403 , substantially fill the space between the cage units immediately above the bottom 400 of the animal feed tray , and are secured to the said bottom for stabilization purposes by struts or support members 402 . upon withdrawal of the feed tray of the invention from the recess between the two multi - cage units , as shown , the food which reposes within the space between the two multi - compartment cage units is urged outwardly by the vertical sheet - form members or plates 401 , falls outwardly from apex 404 due to the inverted &# 34 ; v &# 34 ; contour of the tray , and may be collected in bin b or other suitable receptacle for use at a later date . the tray may then be returned to the recess between the juxtaposed multi - compartment cage units but , as will be apparent from fig5 a simple quick withdrawal of the tray from its location between the juxtaposed multi - compartment cage units effectively withdraws all of the animal food and empties the tray in a most rapid , efficient , and unprecedented manner . there is no need to store the tray , because it is stored in its normal position between the adjacent cage units . only the animal food need be stored for reuse , as previously indicated . fig6 shows a side elevation of the animal feed tray of the invention , as already described , including a bottom 400 having an apex 404 and angling outwardly and downwardly toward its lower edges 405 , 406 , vertical or upright sheetform members or plates 401 , supporting members or struts 402 , and handle 403 . in fig6 the tray is generally shown at t whereas , in fig7 the forward end of the tray is depicted with front end plate 401 , bottom 400 , and handle 403 being apparent . in fig8 an alternative version is depicted , having the same elements 401a , 400a , and 403a , the bottom in this case also having an apex 404a and being angled downwardly and outwardly to lower edges 405a , 405b of tray bottom 400a , but in this case being in the form of an arc , thereby to attain the same effect as attained with the inverted &# 34 ; v &# 34 ; or other similar configurations , namely , an outward spilling of the animal feed contained thereon upon withdrawal of the food tray from its normal space between the side - by - side or longitudinally juxtaposed cage units . as will be apparent from fig5 the space between longitudinal brackets 303a is preferably left uncovered to facilitate the rapid insertion of animal feed into the space between adjoining cage units and upon the upper surface of the tray , especially tray bottom 400 , which obviously could be solid instead of angled or arced sheetform material as illustrated . in operation , the side - by - side juxtaposed animal cages as shown in fig5 or in banks , tiers , or layers as shown in fig1 - 4 , or mounted in usual manner on racks or trays , either before or after filling with animals in the normal manner , have the unique animal feed tray of the present invention placed therebetween , perferably in slidable relationship with brackets connecting the two juxtaposed animal cages at the lower portion thereof . this provides support means for the inward and outward movement of the lower edges of the bottom 400 of the animal feed tray of the invention . in this position , the feed tray is pushed all the way in , as shown in the second and third tiers of fig1 and for the second tier in fig3 . while in this position , the block animal food is conveniently loaded into the space between the juxtaposed animal cages and onto the animal feed tray of the invention . in this position , the animals have access to the animal feed , which is dimensioned so as not to pass through the mesh constituting the walls of the animal cage , at least the walls constituting the opposed or facing walls of the two side - by - side animal cages . although loading is most readily accomplished when the cages are spaced vertically from each other , as is usual when separating trays or racks are employed for supporting the cages , it can also be done conveniently when the cages are stacked upon each other or before stacking . when it is desired to replace the animal food with new animal food , or merely to empty the tray so that the animals can be subjected to an inhalation toxicity test or the like , the handle 403 is grasped and the tray given a firm outward pull , thereby pulling along therewith all of the bar animal food retained thereby in the constricted space between the adjacent animal cages . as the tray passes out from the opening between the juxtaposed animal cages , the bar food falls off of the angled bottom of the tray and may be conveniently collected in another receptacle for disposal or reuse . when the simple , effective , and rapid emptying procedure is completed , the tray is simply pushed back into the recess between the juxtaposed animal cages for storage in an unfilled or empty condition until once again it is desired to provide food to animals within the cages , whereupon the cycle is merely repeated . as a still further optional but preferred feature , as shown in fig4 restraining means r such as a strap attached to the front walls of adjacent cages , as by means of spring clips or snaps s , s , may be present for holding in the front end plate 401 and to restrain undesired , accidental , or inadvertent removal or outward travel of the tray t from the recess between adjacent cages , for example , during moving of a rack containing the said cages or a bank thereof , thereby to prevent inadvertent spillage of food contents from the tray .
novel instantaneously emptiable animal food tray , particularly adapted to be mounted externally of but between two juxtaposed and longitudinally facing animal cages , is disclosed . the tray comprises a bottom which is angled downwardly from a central longitudinal apex to its side edges , vertically extending members at the ends of the tray , and handle means for manipulating the tray into and out of the space between the juxtaposed cages .