fig2 shows a cross - sectional view of the poultry feeder according to the present invention . as illustrated therein , the poultry feeder 20 comprises a feeder bowl 22 having a peripheral portion 22 a and a central portion 22 b extending upwardly from a bottom of the bowl . a feeder tower 24 has an upper feed inlet 26 , an open bottom 28 and at least one lateral feed opening 30 between the upper feed inlet and the open bottom . the feeder tower 24 is shaped such that a lower portion 24 a extends around and is spaced from an outer surface of the central portion 22 b and has a shoulder 24 b which may rest upon a corresponding shoulder 22 c of the central portion when the feeder tower is in a lowermost position relative to the feeder bowl . when the feeder tower is in this lowermost position , as is well known in the art , granular feed entering the upper feed inlet 26 will pass into the bowl through one or more of the lateral feed openings 30 . additionally , feed may pass through scallops 22 e in the central portion 22 b to accurately control the amount of feed entering the bowl . the scallops 22 e extend across the shoulder 22 c of the central portion 22 b . when the feeder tower is adjusted to a position spaced from the bowl 22 , as illustrated in fig2 the feed will enter through the upper feed inlet 26 and pass downwardly into the bowl 22 through the space bounded by the outer surface of the central portion 22 b and the inner surface of the lower portion 24 a . the upper portion of the feeder tower 24 is attached to the delivery pipe 12 and is retained in this position by releasable cap 32 which engages the uppermost portion of the feeder tower 24 , as well as an upper surface of the delivery pipe 12 . delivery pipe 12 will pass through the opening 34 bounded by the cap 32 and the uppermost portion of the feeder tower 24 . as best illustrated in fig1 and 11 , the feeder tower 24 may have a plurality of radially outwardly extending fins 36 that are equally spaced apart around the circumference of the lower position 24 a . at least one feeder tower protrusion 38 extends outwardly from an upper portion of the feeder tower 24 , although two protrusions are illustrated extending from opposite sides of the feeder tower 24 . although two such feeder tower protrusions are illustrated , it is to be understood that one protrusion , or more than two protrusions may be utilized as necessary . at least one such feeder tower protrusion 38 must protrude outwardly from the feeder tower 24 . each of the feeder tower protrusions 38 ends at a lower shoulder portion 38 a , the feeder tower protrusions extending generally in an axial direction on the feeder tower 24 . as can be seen in the figures , the portion of the feeder tower 24 between the lower shoulders 38 a and the shoulder 24 b has a relatively smooth outer surface . an adjusting collar 40 is located on the feeder tower 24 . the adjusting collar 40 , as best illustrated in fig8 and 9 , has a generally cylindrical configuration with a plurality of inward collar protrusions 42 extending inwardly from an inner surface of the collar , such that a diameter of a circle bounded by the innermost surfaces of the inward collar protrusions 42 is less than the transverse dimension between the radially outermost surfaces of the feeder tower protrusions 38 . the axial length of the adjusting collar 40 is slightly less than the axial distance between the lowermost shoulder portions 38 a of the outward protrusions 38 and the shoulder 24 b . when the lowermost edge 40 a of the adjusting collar 40 rests on the shoulder 24 b of the feeder tower 24 , the uppermost edges of the collar protrusions 42 are located below the lowermost shoulders 38 a . when in this position , the collar 40 is freely rotatable with respect to the feeder tower 24 . however , when the collar 40 is axially displaced upwardly relative to the feeder tower 24 , the outward tower protrusions 38 will enter the spaces between the inward collar projections 42 and limit the rotational movement of the collar relative to the tower to the space between adjacent inward collar protrusions 42 . once the inward collar protrusion 42 contacts the outward tower protrusion 38 , further rotation of the collar 40 relative to the feeder tower 24 is prohibited . an outer surface of the adjustment collar has a plurality of upwardly opening notches 44 on opposite sides thereof , as illustrated in fig8 and 9 . bottoms 44 a of adjacent notches 44 are located at different distances between the uppermost edge 40 b and the lowermost edge 40 a of the adjustment collar 40 . also , the uppermost edge 40 b may have one or more flanges 46 extending outwardly therefrom , the flanges having visual indicia 46 a thereon , which may be in the form of an arrow , or the like . the feeder bowl 22 is illustrated in more detail in fig6 and 7 . as can be seen , the peripheral portion 22 a has a plurality of tabs 22 d extending outwardly therefrom , the tabs 22 d being circumferentially spaced apart . bowl 22 has an uppermost edge 22 e lying in a plane p . a first embodiment of a grill utilized with the present invention is illustrated in fig3 - 5 . as can be seen therein , the grill 48 comprises a hub 50 having an annular inner surface 50 a sized so as to receive the adjustment collar 40 therein . the grill also includes a rim 52 that is releasably attached to the peripheral portion 22 a of the feeder bowl 22 , and a plurality of circumferentially spaced apart arms 54 . in a first embodiment of the grill , each of the plurality of arms 54 comprises a first portion 54 a extending downwardly from the hub 50 adjacent to the feeder tower portion 24 a ( see fig2 ) and a second portion 54 b extending radially outwardly from the first portion 54 a to the rim 52 . as can be seen in fig2 the outwardly extending portions 54 b are located below the plane p of the uppermost edge of the feeder bowl 22 . this configuration of the arms enables the birds to feed at 360 degrees around the circumference of the feeder bowl 22 . the rim 52 has a plurality of inwardly extending end tabs 56 extending inwardly therefrom and circumferentially spaced apart about the circumference of the rim . the spacings between the adjacent tabs 56 is sufficient to accommodate therebetween the tabs 22 d of the bowl 22 . rotation of these elements with respect to one another brings the tabs 56 into contact with the tabs 22 d so as to releasably attach the bowl to the grill . the hub 50 has at least one inwardly extending hub protrusion 58 protruding inwardly from opposite sides of the hub 50 , although a plurality of such protrusions 58 are illustrated . the inward hub protrusions are configured so as to engage the notches 44 on the outer surface of the adjusting collar 40 . when the inward hub protrusions 58 engage the notches 44 of the adjustment collar 40 , relative rotation between these elements is prohibited . thus , when hub protrusions 58 are engaged with notches 44 , the adjustment collar , the grill and the feeder bowl may rotate as a unit with respect to the feeder tower 24 , as long as the collar protrusions 42 of the collar 40 are located below the shoulders 38 a of the feeder tower protrusions 38 . the free rotation of the feeder bowl , the grill and the adjusting collar relative to the tower prevents damage to the feeder and the feed adjusting mechanism when these elements are contacted by mature birds . the grill 48 may also include a reinforcing ring 60 interconnecting the portions 54 b of the arms 54 . an upper surface of the hub 50 may have visual indicia 62 thereon located so as to be utilized in conjunction with the visual indicia 46 a on the collar 40 to indicate relative positions of grill 48 and the collar 40 . a second embodiment of a grill is illustrated in fig1 and 13 . in this embodiment , the grill 64 includes hub 66 having inner annular surface 66 a with at least one inward hub protrusion 68 extending inwardly therefrom . the functions of the hub 66 and the inward hub protrusions 68 are the same as in the previously described embodiment . a rim 70 is connected to the hubs by a plurality of circumferentially spaced apart arms 72 . in this particular embodiment , each of the arms 72 has a first section 72 a extending generally radially outwardly from the hub 66 and a second portion 72 b extending downwardly between the first portion 72 a and the rim 70 . as in the previously described embodiment , the rim 70 has a plurality of inward , spaced apart tabs 74 that are releasably engageable with the tabs 22 d to releasably attach the grill 64 to the feeder bowl 22 . again , indicia 76 may be located on the uppermost surface of the hub 66 to be utilized in conjunction with the indicia 46 a on the adjustment collar 40 to indicate the relative positions of the collar and the grill . in use , as best illustrated in fig2 the feeder 20 will be supported on the delivery pipe ( not shown ) passing through the opening 34 by the cap 32 . gravity causes the feeder bowl 22 , the grill 48 , 64 and the collar 40 to be urged downwardly relative to the feeder tower 24 . the inward hub protrusions 58 , 68 in contact with the bottoms 44 a of notches 44 on the collar , will urge the collar 40 downwardly such that lowermost edge 40 a is in contact with the shoulder 24 b . this will position the bowl 22 relative to the lateral feed openings 30 and to the open bottom 28 of the feeder tower 24 so as to allow a predetermined amount of feed to pass into the feeder bowl 22 . when it is desired to adjust the feeder capacity , the feeder bowl 22 , the grill 48 and the collar 40 are manually moved upwardly relative to the feeder tower 24 such that the outward tower protrusions 38 move into the spaces between the inward collar protrusions 42 . such upward movement also moves the grill upwardly relative to the collar 40 such that the inward hub protrusions 58 , 68 are disengaged from the notches 44 . thus , manual rotation of the grill 48 and bowl 22 will rotate the grill relative to the collar 40 , since rotation of the collar 40 is prohibited by the engagement of collar protrusions 42 with outward protrusions 38 . rotation of the grill 48 , 64 relative to the collar 40 will enable the inward hub protrusions 58 , 68 to engage other notches 44 when the grill is moved downwardly relative to the collar 40 . by engaging other notches , when the collar 44 is again moved downwardly such that the lowermost edge 40 a contacts the shoulder 24 b , will adjust the relative positions between the feeder bowl 22 , and the lateral feed openings 30 and the open end 28 , so as to adjust the amount of feed passing into the bowl . as can be seen , the adjustment may be readily achieved in a short amount of time without undue effort on the part of the user . once the elements are in their adjusted positions , the free rotation of the collar 40 , the grill 48 , 64 and the feeder bowl 22 as a unit relative to the feeder tower 24 will prevent damage to the adjusting mechanism when the grill or the bowl is struck by a mature bird during feeding . the foregoing description is provided for illustrative purposes only and should not be construed as in any way limiting this invention , the scope of which is defined solely by the appended claims .
a poultry feeder having an adjustment mechanism which adjusts the relative positions between the feeder tower and the feeder bowl to control the amount of feed entering the bowl that is readily adjustable , and , at the same time , enables the feeder bowl , the grill and the adjustment collar to freely rotate relative to the feeder tower to prevent damage to the adjustment mechanism when the grill and / or the bowl is contacted by the feeding birds . a lower edge of an adjusting collar rests on a shoulder portion of the feeder tower when the poultry feeder is suspended above floor level . the relative positions between a bottom of the feeder tower and the feeder bowl is adjustable in a plurality of discreet positions . each of the plurality of discreet positions provides a different clearance between the bottom of the feeder tower and the bowl , thus controlling the amount of feed which may enter the bowl from the feeder tower .