as background and to better understand by comparison the improved livestock feeder of the present invention , reference should be made to animal feeder illustrated in fig1 and labeled prior art . the prior art animal feeder , indicated generally at 40 , comprises an open - topped hopper , indicated generally at 45 , defined by opposing , downwardly sloping side walls 41 and opposing substantially vertical end walls 42 . the opposing end walls 42 are of generally rectangular shape and their upper edges are preferably positioned on substantially the same level as the upper edges of the downwardly sloping side walls 41 . the lower edges of the opposing end walls 42 terminate at a substantial distance below the lower edges of the opposing side walls 42 and are suitably secured to opposed ends of a bottom wall 43 . the bottom wall 43 is connected to upwardly and outwardly inclined outer panel portions 44 forming elongate feed troughs , indicated generally at 55 , along opposite sides of the animal feeder 40 and below the opposing side walls 41 . the lower portions of the downwardly converging side walls 41 and the bottom wall 43 define therebetween a feed discharge opening 16 . as another element of the prior art feeder 40 , reinforcing dividers , shown in the form of plurality of spaced - apart , elongate rods 57 span the feed troughs 55 from the side walls 41 to the respective outer trough portions 44 of the bottom wall 43 . the rods 57 reinforce the feed bin and divide each feed trough 55 into individual feeding areas which serve to aid in giving the livestock animals access to feed . as another element of the prior art feeder 40 , a pair of elongate , pivotally mounted , vertically adjustable gates 48 including gate adjustment means 49 mechanically coupled thereto overlie the respective feed discharge openings 46 for varying the size of each opening 46 . the gates 48 extend longitudinally between the end walls 42 with the opposite ends of the gates 48 terminating closely adjacent end walls 42 . a small clearance remains necessary between the ends of the gates 48 and the end walls 42 so that the gates 48 may pivot freely in their described adjusted positions . the gate 48 , which functions to regulate the amount of food into the trough , is shown as a flat rectangular plate . it is envisioned that gate 48 , can take the form of other shapes such as circular or conical . another element of the prior art feeder 40 is the feed drop tube holder , indicated generally at 60 , as shown in fig1 . the feed drop tube holder 60 is a generally flat , rectangular structure having a circular opening 60 a in the center thereof . holder 60 includes a plurality of tabs 60 b integrally formed on opposite ends thereof at predetermined intervals . tabs 60 b are adapted to engage a plurality of cooperating slots 61 which are disposed about the upper peripheral edges of side walls 41 at regular intervals . one of the principle advantages of the feed drop tube holder 60 is that it does not require brackets for additional hardware to install . holder 60 is manufactured to an overall length that is slightly larger than the inside dimension between the opposing side walls 41 as measured in a plane coincidental with slots 61 . being made of a flexible , resilient material holder 60 may be compressed lengthwise by hand pressure into a curved bow shape in order to insert tab 60 b into cooperating slot 61 . once released from this position , holder 60 springs back into its original flat configuration such that tabs 60 b project outwardly through slots 61 in side walls 41 retaining holder 60 therebetween . the central opening 60 a in holder 60 is sized to a dimension that is slightly larger than the feed drop tube 63 to accommodate the insertion of the same into central openings 60 a at varying angles without binding therein . it will be appreciated by those skilled in the art that holder 60 may be easily repositioned to several longitudinal positions within feeder 40 by removing and replacing holder 60 to a different grouping of opposed slots 61 as desired . since all of the above hereinabove described features of feeder 40 are well known to those skilled in the art , further detailed discussion of the same is not deemed necessary . one of the principle improvements of the animal feeder 10 of the present invention is the feed dispensing mechanism , indicated generally at 20 comprising a pair of control levers 16 with associated indexing holes 23 , a scale 25 with numeric indicia 26 , control rods 15 and feed gates 14 as shown in fig2 . the structure and function of these components will now be described in further detail . it will be understood that a dispensing mechanism as depicted in fig2 is installed on the interior surface of each end wall 11 of the present feeder 10 to operate the vertically adjustable feed gates 14 thereof . a pair of adjustable control levers 16 are pivotally mounted on the interior surface of each end wall 11 by use of suitable attaching hardware such as a pivot screw 17 , lock washer 18 , spacer 13 and compression spring 19 as seen in fig3 and 4 . an opposite end of the control lever 16 includes a pointer 16 a for indicating the setting for the feed gates 14 as described hereinafter in further detail . the pointer 16 a is provided with a knob 21 including an index pin 22 projecting outwardly therefrom for mating engagement with an array of index holes 23 which are radially disposed at regular intervals along an arc concentric with an axis of the pivot screw 17 as seen in fig3 and 4 . intermediate the pivot screw 17 and the knob 21 an upper end of a connecting rod 15 is secured using suitable attaching hardware . in the preferred embodiment a connecting tab 24 having an elongated slot 37 formed at one end thereof is coupled to the upper end of connecting rod 15 . the tab 24 is mounted on a connecting bolt 35 which loosely penetrates the slot 37 and is secured thereon by lock nut 36 . an opposite end of each connector rod 15 is configured as illustrated in fig5 - 7 . the lower most end of the connector rod 15 is initially bent at 90 ° to a longitudinal axis thereof as at 15 in fig5 so as to lie in a plane coincident with the major portion of the rod 15 . thereafter the tip portion 15 b is again bent 90 ° as at 15 to lie in a plane perpendicular to the longitudinal axis of the major portion of the rod 15 as shown in fig6 . to install the connector rod 15 in the feed gate 14 the tip portion 15 b is inserted through mounting aperture 38 as seen in fig5 attaching the rod 15 to the feed gate 14 without bolting or welding the connection . thus installed , it will be appreciated that a non - binding linkage is provided between the rod 15 and the gate 14 to facilitate operation of the dispensing mechanism when the feeder is filled to capacity . in normal operation the user of the improved feeder 10 adjusts the dispensing mechanism 20 by grasping and pulling the knob 21 outwardly from an engaged position as shown in fig8 and pivoting the lever 16 upwardly or downwardly to adjust the gate 14 to the desired vertical position . after the desired position or hole 23 is selected , the knob 21 is again released to the position shown in fig9 . it will be appreciated that each respective indexing hole 23 corresponds to numeric indicia 26 on the scale 25 so as to dispense feed at a predetermined rate to livestock eating from the feeder 10 . in tills manner several feeders 10 can be utilized in a livestock production facility to deliver a predetermined amount of feed to animals at any stage of the life cycle using the standard settings on the scale 25 . it will also be noted that a feeder 10 can be disposed between adjacent pens in such a production facility and adjusted to deliver feed in different amounts from opposite sides of the feeder 10 . thus , the improved feeder of the present invention provides significant advantages to animal producers which are unknown in the prior art . further , the physical location of the dispensing mechanisms 20 on the interior end walls 11 of the feeder rather than on lateral brace members 47 extending across the hopper 45 as shown in fig1 lends itself to another principle advantage of the present invention . the improved feeder 10 is provided with a removable dust cover , indicated generally at 33 as shown in fig1 - 12 . the dust cover 33 is comprised of a pair of generally rectangular panels 34 which are configured and dimensioned to closely fit the interior peripheral edge of the feeder 10 when installed therein as shown in fig1 . it will be understood that the feed drop tube holder 60 of the prior art as shown in fig1 functions as a part of the dust cover 33 as described hereinafter in further detail . the dust cover panels 34 together with the feed drop tube holder 60 are fabricated from a resilient plastic material and are easily removed for cleaning and maintenance purposes . the dust cover panels 34 are supported in the position shown in fig1 by a pair of generally parallel support braces 27 which extend transversely across the top opening of the feeder 10 interconnecting the downwardly sloping side walls 12 . braces 27 are configured to support the inner edges of the panels 34 in the position shown in fig1 . in the preferred embodiment the inner edges of the dust cover panels 34 are provided with attaching hardware such as j - shaped shaped brackets 39 which are secured to the inner edges of panels 34 by suitable fasteners . j - shaped brackets 39 engage the support braces to 27 to secure the panels 34 as more clearly shown in fig1 . an opposite end portion of the panels 34 are provided with cut - out portions 34 a to accommodate the connecting rods 15 disposed along the end walls 11 of the feeder . the insertion of the feed drop tube holder 28 is accomplished as described hereinabove and in u . s . pat . no . 5 , 558 , 039 . it will be appreciated by those skilled in the art that the remaining peripheral edges of the panels 34 are supported by their contact with the downwardly and inwardly converging side walls 12 of the feeder . in this construction the dust cover 33 functions to reduce the airborne particulates generated by the automatic feed delivery system utilized in conjunction with feeders of this type . thus , the environment of the production facility is made safer and respiratory hazards are reduced for both man and animal . another preferred embodiment of the present invention will be now described with reference to fig1 . in this regard , fig1 is a cross - sectional view of the feeder 10 showing the cleaning mechanism 96 incorporated into the feeder 10 . the cleaning mechanism 96 , which functions to allow easy removal of cleaning fluids and waste feed , is constructed of an adjustable member or outer door 98 , a linkage 100 connected to the outer door 98 by a fastener 102 at the bottom end 104 of the linkage 100 , as well as to an engagement member or control lever 106 . the control lever 106 is connected to the top portion 108 of linkage 100 and is pivotally mounted by the mounting system 110 to end wall 42 . the mounting system 110 includes and has a knob 112 , lock washer 114 , spacer 116 , and compression ring 118 . the structure and function of the control lever 106 is similar to that of the adjustable control levers 16 as seen in fig3 , 8 and 9 . control lever 106 functions to lift the outer door 98 , through linkage 100 to an upward position , to expose four apertures 120 . the apertures 120 , which are shown in fig1 as being covered by the outer door 98 , are elongated rectangular in shape and are located in the end wall 42 adjacent to the bottom surface 123 of the feed trough 55 . the outer door 98 covers the apertures 120 and controls the flow of cleaning fluid and waste grain through the apertures 120 during the cleaning of the feeder 10 . further shown in fig1 are the optional , although preferred , first inner door 122 and second inner door 124 . these doors are disposed adjacent the inner surface 126 of end wall 42 and are connected to the outer door 98 by through bolts 128 . the through bolts 128 pass through the end wall 42 through a plurality of elongated guide slots 130 formed in end wall 42 . the first and second inner doors 122 , 124 are displaced upwardly and downwardly in conjunction with the outer door 98 as directed by control lever 106 . as better seen in fig1 , through bolts 128 couple the first inner door 122 by using lock washers 132 and a nut 134 . as can be appreciated , the particular fasteners used to movably couple the outer door 98 and the inner doors 122 , 124 can take any suitable form known in the fastener art . further shown in fig1 is the coupling of linkage 100 with the outer door 98 . shown is the linkage rod tip portion 136 which is disposed through an elongated slot 138 formed in end wall 42 . the linkage rod tip portion 136 is located through hole 140 in the outer door 98 and is fastened by a fastener 142 . [ 0079 ] fig1 shows the cleaning mechanism 96 in its raised position . control lever 106 is depicted as being raised and engaged in an index member or indexing hole 144 . in normal operation , the user of the feeder 10 adjusts the cleaning mechanism 96 by grasping and pulling knob 112 outwardly from an engaged position and pivoting the control lever 106 upwardly or downwardly to adjust the outer door 98 to the desired vertical position . after the desired position or indexing hole 144 is selected , the knob 112 is released . the function of the control lever 106 and knob 112 is similar to that as previously described in the descriptions of fig8 and 9 . [ 0080 ] fig1 is a sectional view of the cleaning mechanism 96 and improved flanges of the current invention . the improved flange portions allow for easier cleaning of the feeder as well as increased comfort to the feeding animals . disposed on the opposing end side 42 is a ledge 148 generally parallel to the inner surface 126 of opposing end wall 42 . ledge 148 functions to reduce harmful contact to the feeding animals by providing an increased surface area of contact with the feeding animal . as better seen in fig1 a , the ledge 148 is connected to end wall 42 by a flange 150 , the outer surface being closed off by a flange 152 . flange 148 has a width from one - half ( ½ ″) to one ( 1 ″) inch , and preferably five - eighths ( ⅝ ″) inch . the flange design allows for the proper stiffening and support of end wall 42 as well as reducing the discomfort to animals which may be forced into the edge . the design also allows for easy stacking of the feeder component materials . an alternate design can be seen in fig1 b , which shows a curved portion 154 joined to the end wall 42 . [ 0081 ] fig1 further shows a ledge 146 extending outwardly from the outer trough portion 44 . the outwardly extending flange 146 is connected to the outer trough portion 44 by transition flange 156 . the configuration of the outwardly extending flange 146 and transition flange 156 reduces the number of unexposed surfaces , resulting in better access to the trough 55 surfaces by a stream of cleaning fluid . conventional feeders typically have flat trough 55 bottom surfaces 123 . to assist in the removal of the cleaning fluids , it is optionally possible to adjust the support structure 158 ( shown in fig1 ) so that the bottom surface 123 of the trough 55 is angled down toward the apertures 120 to assist in the drainage of the cleaning fluids . the method of utilizing the aforementioned cleaning mechanism will now be discussed in detail . a feeder 10 is provided having cleaning mechanism 96 consisting of a plurality of apertures 120 covered by an outer door 98 . the outer door 98 is coupled to a control lever 106 which is pivotably mounted to the side of the feeder 10 . the control lever 106 , which has a knob 112 , is adjustable through a plurality of index positions 144 allowing for the raising and lowering of the outer door 98 . when it is desirable to clean the feeder , the operator will grasp the knob 112 and raises the control lever 106 to a raised index hole 144 , moving the outer door 98 to expose at least a portion of the aperture 120 . the knob 112 is then released locking the control lever 106 in its upward position . the feeder 10 is then exposed to a stream of high pressure water , washing and rinsing the surfaces of the feeder 10 . it is preferred that the operator use the stream high pressure water to “ push ” the fluids and waste feed out of the trough 55 through the apertures 120 . it is envisioned that the control lever 106 will be left in its raised position until the trough 55 is substantially free of cleaning fluid . when the trough 55 has been cleaned , the operator grasps the knob 112 and moves it downward so the outer door 98 covers the aperture 120 . the terms “ top ”, “ bottom ”, “ side ”, and so forth have been used herein merely for convenience to describe the present invention and its parts as oriented in the drawings . it is to be understood , however , that these terms are in no way limiting to the invention since such invention may obviously be disposed in different orientations when in use . from the above it can be seen that the improved animal feeder of the present invention provides an adjustable dispensing mechanism for the accurate delivery of feed to livestock animals . the dispensing mechanism includes standardized controls and settings to enable a precise amount of feed to be delivered to animals during specific stages of their life cycle to ensure optimum growth rates . the present invention may , of course , be carried out in other specific ways than those herein set forth without departing from the spirit and essential characteristics of such invention . the present embodiments are , therefore , to be considered in all respects as illustrative and not restrictive , and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein . the description of the invention is merely exemplary in nature and , thus , variations that do not depart from the gist of the invention are intended to be within the scope of the invention . such variations are not to be regarded as a departure from the spirit and scope of the invention .
an improved livestock feeder provided with an adjustable feed dispensing mechanism including control levers which are operatively connected to the feed metering gates to control the flow of feed to livestock . the dispensing mechanism features a plurality of adjustable control levers which engage an array of indexing holes formed in the feeder to set the vertical height adjustment of the feed gates . the dispensing mechanism includes a graduated scale corresponding to each of the index holes to provide a standard setting for the feeder which can be utilized by an animal producer to supply of feed flow at a given stage in the animal &# 39 ; s life cycle to obtain a desired growth rate .