Abstract:
My invention provides a spinner unit for attachment to the intermittently rotating vertical control unit shaft of an animal feeder, the feeder having a feed storage unit that discharges feed through a discharge tube into a spinner unit housing interior, where the feed is enclosed prior to discharge from specially configured discharge openings. The extensive covering configuration provided by the housing top, bottom and in some embodiments, sides, allows little or no feed to be thieved by small animals such as birds, prevents feed loss from wind, and prevents feed from being thrown up and off the spinner unit when the spinner unit is spinning.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The field of the invention is animal and wildlife feeders, or, more specifically, enclosed spinner units for replacing spinner plates used for distributing feed from the feeders. 
     2. Description of Related Art 
     In the current art of animal and wildlife feeders, it is typical for the feeder to have a motorized control unit that intermittently rotates a vertically oriented shaft to which is attached a spinner plate. The spinner plate is positioned beneath a feed storage unit, the storage unit allowing feed, such as corn, to discharge through a tube directed onto the spinner plate. The spinner plate is typically rotated for about 8 seconds, twice a day, leaving the spinner plate stationary for long periods of time with a full load of feed from the feed storage unit. When the control unit shaft rotates the spinner plate the feed is thrown from the plate, in response to the centrifugal forces generated by the rapid spinning of the spinner plate. 
     Thieving birds and small animals have plagued feeder operators for years. For example, spinner plates leave substantial amounts of feed exposed to such animals, either near the discharge tube, on the top of the spinner plate, generally, or at the spinner plate discharge openings, where the openings allow birds to insert their heads into the opening to gain access to the feed. 
     Another operator problem is the inability of the spinner plate to prevent feed from being thrown upwardly from the spinner plate as it spins, leaving substantial amounts of feed to fall beneath the feeder instead of being thrown clear of the feeder to an area of some distance from the feeder. Some wildlife, such as deer, tend to feed in families or segregated groups, and do not prefer to feed near the feeder where they are unnecessarily close to other families or groups. A related problem is the inability of many spinner plates to maximize the distance the feed travels from the feeder, and to throw the feed in a consistent and uniform manner in a circular area about the feeder. 
     Many existing spinner plates are highly subject to wind dislodging feed from the spinner plate while the spinner plate is stationary. Feed dislodged in this manner lands beneath, or much too close to the feeder, resulting in substantial loss of feed, to the point that the feed storage unit can be emptied by the continued discharge of feed onto a spinner plate cleared by the wind. Feeders are often left unattended for extended periods of time, and this problem can cause a feeder to be emptied and useless for long periods of time. 
     For example, U.S. Pat. No. 4,986,220 to Reneau, et al. leaves substantial amounts of feed uncovered allowing small animal access to the feed through the open plate in areas around the sleeve (reference  50  on FIG.  3 ). The Reneau device also has no structure for enhancing the consistency and uniformity of the feed distribution, instead having a wide, gated mouth. The large areas of feed without a covering top also allow feed to be thrown up and off the spinner plate. The Reneau gates are also subject to being flipped backward over the top of the spinner plate, leaving feed exposed at the openings. Similarly, U.S. Pat. No. 5,143,289 to Gresham, et al. allows unnecessarily easy small animal access due to the lack of a covering top and sides, above and around, significant portions of the feed. (See FIGS. 3-4) 
     Another example is U.S. Pat. No. 3,195,508 to Lehman, et al., which has an open spinner plate with little protection from small animals or the wind. U.S. Pat. No. 5,820,035 to Johnson, et al. has a similarly open spinner plate. 
     U.S. Pat. No. 1,355,399 to Kelley is a round tube device that leaves discharge openings of such size as to allow a bird to insert its head within the opening, thus gaining access to the feed. The diameter is uniform and has no significant structure for enhancing the consistency and uniformity of the feed distribution pattern. Simple discharge interference lips (reference B 4  on FIGS. 3-4) restrict the feed discharge and provide some control over the distribution radius. 
     While these devices may function generally with respect to the purposes for which they were designed, they would not be as suitable for the purposes of the present invention, as hereinafter described. For example, such devices, do not provide what is needed, that is a spinner unit that encloses the feed in the spinner unit housing such that little or no top access is available to small animals, little or no access through the discharge openings is available to such animals, little or no feed is thrown up and off the spinner unit due to an inadequate covering configuration, little or no feed is dislodged from the spinner unit by wind, and the distribution pattern of the feed is enhanced for consistency and uniformity. 
     SUMMARY OF THE INVENTION 
     The present invention overcomes the shortcomings of the prior art by providing a spinner unit that encloses the feed in the spinner unit housing such that little or no top access is available to small animals. A special housing top is configured to cover all feed from the inlet that receives the feed from the feed storage unit discharge tube to the housing discharge openings. Similarly, little or no feed is thrown up and off the spinner unit due since such upward movement is prevented by the special housing cover configuration. 
     Also, little or no access through the housing discharge openings is available to such animals. Such openings are carefully sized and shaped to stop birds from inserting their heads through the discharge openings. Furthermore, little or no feed is dislodged from the spinner unit by wind due to the special enclosure of the feed by the spinner unit housing top and bottom, the symmetry of the housing rapidly turning the spinner unit to a sideways position such that the wind does not blow directly into the housing discharge openings. 
     Additionally, the distribution pattern of the feed is enhanced for consistency and uniformity in embodiments having a housing taper extending toward each housing discharge opening. This creates a symmetrical opening of reduced diameter that creates a jetting effect that contributes to a larger distribution distance and a uniform and consistent distribution pattern. 
     Also, in some embodiments, covers are placed over the housing openings that will not flip backwards on to the top of the spinner unit. Such covers are also prevented from rotating rearwardly into the spinner unit interior. 
     My invention provides a spinner unit for attachment to a substantially vertical rotating shaft of a control unit of a feeder, the control unit having a motor for rotating the shaft, the feeder having a feed storage unit for storing feed and discharging stored feed in a downward direction, the spinner unit comprising: a housing having a top and a bottom, the top and bottom being joined to form a housing interior, and to further form a first opening and a second opening, the top having an inlet for receiving feed from the feed storage unit into the housing interior, the housing having a maximum horizontal transverse width at the inlet that is greater than a maximum horizontal width of the housing at the first opening and a maximum horizontal width of the housing at the second opening, the top and bottom enclosing received feed in the interior such that feed proximate the first and second openings is covered by the housing top; and a shaft attachment member for attaching the housing to the control unit rotating shaft, such that when the shaft rotates, the housing spins, and received feed is forced from the housing interior through the first and second openings. 
     In one embodiment, the housing top and bottom enclose received feed in the housing interior such that the top substantially covers received feed in the interior between the top inlet and the first opening, and in the interior between the top inlet and the second opening. 
     In one embodiment, the housing top and bottom join to form a plurality of sides between the first and second openings. 
     In one embodiment, the formed sides are substantially vertical. 
     In one embodiment, the housing top extends beyond the housing bottom proximate at least one of the first opening and the second opening. 
     In one embodiment, the spinner unit further comprises a first opening cover attached to the housing for opening and closing over the first opening and a second opening cover attached to the housing for opening and closing over the second opening, the covers being attached such that the covers open when the housing is spinning, in response to centrifugal force. 
     In one embodiment, the feed storage unit has a discharge member through which the received feed is discharged from the feed storage unit, and the housing top inlet closely receives the discharge member. 
     In one embodiment, the housing has a longitudinal axis extending between the first and second openings, the housing top having an apex aligned with the longitudinal axis. 
     In one embodiment, the housing has a longitudinal axis extending between the first and second openings, the housing bottom having an apex aligned with the longitudinal axis. 
     In one embodiment, the housing has a longitudinal axis extending between the first and second openings, the housing top and bottom each having an apex aligned with the longitudinal axis. 
     In one embodiment, the housing top is curved. 
     In one embodiment, the housing bottom is curved. 
     In one embodiment, the housing top and bottom are curved. 
     I have provided a spinner unit for attachment to a substantially vertical rotating shaft of a control unit of a feeder, the control unit having a motor for rotating the shaft, the feeder having a feed storage unit for storing feed and discharging stored feed in a downward direction, the spinner unit comprising: a housing having a top, a bottom, a plurality of sides, and a plurality of side openings, the top, bottom and sides being joined to form a housing interior, the top having an inlet for receiving feed from the feed storage unit into the housing interior, the top, sides and bottom enclosing received feed in the interior such that received feed proximate the side openings is covered by the housing top; and a shaft attachment member for attaching the housing to the control unit rotating shaft, such that, when the shaft rotates, the housing spins, and received feed is forced from the housing interior through the side openings. 
     In one embodiment, the housing top and bottom enclose received feed in the housing interior such that the top substantially covers received feed in the interior between the top inlet and each of the side openings. 
     In one embodiment, the number of sides is two. 
     In one embodiment, the housing top and bottom are substantially circular in a plane substantially perpendicular to the control unit rotating shaft. 
     In one embodiment, the spinner unit further comprises an interior guide for each of the plurality of side openings, the interior guides being positioned adjacent the openings such that received feed contacting the guides is guided to the opening adjacent the contacted guide. 
     In one embodiment, the housing sides are substantially straight and perpendicular to the housing top, the sides having a height, each side having substantially the same height, the housing top having a width, the side heights being less than the housing top width. 
     In one embodiment, the number of sides is four. 
     In one embodiment, the housing top and bottom are substantially hexagonal in a plane substantially perpendicular to the control unit rotating shaft. 
     In one embodiment, the number of sides is six. 
     In one embodiment, the housing top and bottom are substantially octagonal in a plane substantially perpendicular to the control unit rotating shaft. 
     In one embodiment, the sides are substantially perpendicular to the housing top. 
     In one embodiment, the spinner unit further comprises a plurality of covers attached to the housing for opening and closing over each of the side openings, the covers being attached such that the covers open when the housing is spinning, in response to centrifugal force. 
     In one embodiment, the covers are attached such that the housing top prevents the covers from rotating to a position over the housing top. 
     In one embodiment, the covers are sized such that, when the covers are in the closed position, the housing bottom prevents the covers from rotating into the housing interior. 
     In one embodiment, the feed storage unit has a discharge member through which the received feed is discharged from the feed storage unit, and the housing top inlet closely receives the discharge member. 
     A spinner unit is provided for attachment to a substantially vertical rotating shaft of a control unit of a feeder, the control unit having a motor for rotating the shaft, the feeder having a feed storage unit for storing feed and discharging stored feed in a downward direction, the spinner unit comprising: a housing having a top, a bottom, a plurality of sides, a first opening and a second opening, the top, bottom and sides being joined to form a housing interior, the top, bottom and sides having a first end defining the first opening as a polygon, the top, bottom and sides having a second end defining the second opening as a polygon, the first and second openings each having a height and a width, the height of each such opening being less than the width of each such opening, the top having an inlet for receiving feed from the feed storage unit into the housing interior, the top, sides and bottom enclosing received feed in the interior such that received feed proximate the openings is covered by the housing top; and a shaft attachment member for attaching the housing to the control unit rotating shaft, such that, when the shaft rotates, the housing spins, and received feed is forced from the housing interior through the openings. 
     In one embodiment, the top and bottom enclose received feed in the housing interior such that the top substantially covers received feed in the interior between the top inlet and the first opening, and in the interior between the top inlet and the second opening. 
     In one embodiment, the number of sides is four and the first and second openings are hexagonally defined. 
     My invention provides a spinner unit for attachment to a substantially vertical rotating shaft of a control unit of a feeder, the control unit having a motor for rotating the shaft, the feeder having a feed storage unit for storing feed and discharging stored feed in a downward direction, the spinner unit comprising: a housing having a top, a bottom, four sides, and two side openings, the sides being substantially perpendicular to the top and bottom, the top, bottom and sides being joined to form a housing interior, the top and bottom being substantially hexagonal in a plane substantially perpendicular to the control unit rotating shaft, the top having an inlet for receiving feed from the feed storage unit into the housing interior, the housing top and bottom enclosing received feed in the housing interior such that the top substantially covers received feed in the interior between the top inlet and each of the side opening; and a shaft attachment member for attaching the housing to the control unit rotating shaft, such that, when the shaft rotates, the housing spins, and received feed is forced from the housing interior through the side openings. 
     The foregoing features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts of exemplary embodiments of the invention. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a view illustrating the use of an example embodiment of the present invention on an animal feeder. 
     FIG. 2 is a cutaway section of the feeder unit shown completely in FIG.  1 . 
     FIG. 3 is a perspective view of an example embodiment of the present invention. 
     FIG. 4 is a top view of the example embodiment of the present invention shown in FIG.  3 . 
     FIG. 5 is a sectional view taken along cutting plane  5 — 5  as shown on FIG.  4 . 
     FIG. 6 is a perspective view of an example embodiment of the present invention. 
     FIG. 7 is a side view of the example embodiment of the present invention shown in FIG.  6 . 
     FIG. 8 is a perspective view of an example embodiment of the present invention. 
     FIG. 9 is a perspective view of an example embodiment of the present invention. 
     FIG. 10 is a top view of the example embodiment of the present invention shown in FIG.  9 . 
     FIG. 11 is an end view of the example embodiment of the present invention shown in FIG.  9 . 
     FIG. 12 is a perspective view of an example embodiment of the present invention. 
     FIG. 12A is a front view of an opening cover on the example embodiment shown in FIG.  12 . 
     FIG. 13 is a perspective view of an example embodiment of the present invention. 
     FIG. 14 is a top view of the example embodiment of the present invention shown in FIG.  13 . 
     FIG. 15 is a sectional view taken along cutting plane  14 — 14  on FIG.  14 . 
     FIG. 16 is an end view of the example embodiment of the present invention shown in FIG.  13 . 
     FIG. 17 is a perspective view of an example embodiment of the present invention. 
     FIG. 18 is a top view of the example embodiment of the present invention shown in FIG.  17 . 
     FIG. 19 is a sectional view taken along cutting plane  19 — 19  on FIG.  18 . 
     FIG. 20 is an end view of the example embodiment of the present invention shown in FIG.  17 . 
     FIG. 21 is a perspective view of an example embodiment of the present invention. 
     FIG. 22 is an end view of the example embodiment of the present invention shown in FIG.  21 . 
     FIG. 23 is a perspective view of an example embodiment of the present invention. 
     FIG. 24 is a top view of the example embodiment of the present invention shown in FIG.  23 . 
     FIG. 25 is an end view of the example embodiment of the present invention shown in FIG.  23 . 
     FIG. 26 is a top view of the example embodiment of the present invention shown in FIG. 23, with the housing top removed to reveal interior guides. 
     FIG. 27 is a perspective view of an example embodiment of the present invention. 
     FIG. 28 is a top view of the example embodiment of the present invention shown in FIG.  27 . 
     FIG. 29 is an end view of the example embodiment of the present invention, shown in FIG.  27 . 
     FIG. 30 is a perspective view of an example embodiment of the present invention. 
     FIG. 31 is a top view of the example embodiment of the present invention shown in FIG.  30 . 
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     The following discussion describes in detail exemplary embodiments of the invention. This discussion should not be construed, however, as limiting the invention to those particular embodiments. Practitioners skilled in the art will recognize numerous other embodiments as well. For a definition of the complete scope of the invention, the reader is directed to the appended claims. 
     An exemplary embodiment of a spinner unit  30  of the present invention is illustrated in FIGS. 1-5. In FIGS. 1-2, the exemplary spinner unit  30  is shown in use on a typical animal feeder  10  of the type having a battery-powered, motorized control unit  12 , having an upwardly directed shaft  14  to which the spinner unit  30  is attached. The control unit  12  is attached to feeder structure including a feed storage unit  16 , the feed storage unit containing animal feed that exits through a feed storage unit discharge member  18 . The discharge member  18  is typically tube-shaped and extends downwardly from the feed storage unit  16 , allowing feed to exit in a downward direction. The feed storage unit  16  is typically supported above the ground  22  by legs  20 . 
     As shown in FIG. 3, this exemplary spinner unit  30  has a housing formed by a generally planar top  32  and bottom  34  joined by four sides  36 , 38 , 40 , 42 . In this exemplary embodiment, the sides are substantially perpendicular to the housing top and bottom. The housing top, bottom and two sides  38 , 42  terminate to define a housing first opening  44 . Similarly, the housing top, bottom and two sides  36 , 40  terminate to define a housing second opening  46 . The housing top, bottom and four sides form an interior  48  into which feed is received from the feed storage unit discharge member  18  through an inlet  50 . In this exemplary embodiment  30 , the sides are substantially perpendicular to the housing top  32 , and the housing top and bottom are substantially hexagonal when viewed in a plane perpendicular to the shaft  14  and parallel to the ground surface  22 . In one embodiment, the housing top, bottom and four sides are constructed from metal, e.g. aluminum or stainless steel, while other embodiments are constructed from other metals and plastics. 
     The exemplary spinner unit  30  is shown in FIG. 5 to have a shaft attachment member, in this case a collar  54 , attached to the housing bottom  34  using a press fit  52 , whereby the collar is shouldered on the top such that a portion extends through a hole in the housing bottom, the portion then being flared and spread against the housing bottom. The collar has a bore  56  for receiving the control unit shaft  14 . The shaft is secured in the bore using a typical set screw in threaded set screw hole  58 . When the spinner unit  30  is thus attached to the shaft  14 , the spinner unit is positioned such that the housing top  32  and bottom  34  are substantially horizontal to the ground surface  22  and perpendicular to the shaft  14 . 
     The top view of the exemplary spinner unit  30  is shown in FIG. 4. A maximum horizontal transverse width W 1  of the housing is measured at the inlet  50 , the inlet having a maximum horizontal transverse width W 2 . The housing width W 1  is greater than the housing first opening  44  maximum horizontal width W 3 , the width W 3  also being the width of the housing second opening  46 . The first and second openings are shown to have a height H 1 . For this exemplary embodiment of the spinner unit  30 , width W 1  is approximately 3.5 inches (89 millimeters), width W 2  is approximately 2.5 inches (64 millimeters), width W 3  is approximately 1.375 inches (35 millimeters), and height H 1  is approximately 0.75 inches (19 millimeters). 
     When in use, the exemplary spinner unit of FIGS. 3-5 receives feed from the feed storage unit discharge tube  18  through the housing inlet  50  into the housing interior  48 . The feed settles within the housing interior  48  and toward the housing first and second openings  44 ,  46 . In common practice, the control unit  12  rotates the shaft  14  intermittently, such that the spinner unit  30  is stationary for extended periods of time. 
     As shown for this exemplary spinner unit  30  in FIG. 4, housing top  32  covers any feed proximate the housing first opening  44  and housing second opening  46 , and also covers feed from the inlet  50  to the housing first opening and from the inlet to the housing second opening. Only feed that settles within the inlet circumference, when viewed from the top, is left uncovered by the housing top. The inlet typically has a diameter of approximately 2.5 inches (64 millimeters) and the feed storage unit discharge tube  18  will have an outer diameter of approximately 1.875 inches (48 millimeters), thus the discharge tube is closely received by the inlet. This leaves a circumferential opening of approximately 0.3125 inch (8 millimeters) between the inlet edge and the discharge tube  18 . This opening is sufficiently small such that very little feed is thrown upwardly through the inlet when the spinner unit  30  is spinning, and, when the unit  30  is stationary, birds are almost entirely prevented from thieving feed from the interior  48 , and the feed is effectively isolated from the wind. The height H 1  of the openings is sufficiently small such that birds are prevented from inserting their heads into the first and second openings  44 , 46  to steal feed. 
     At predetermined intervals, the control unit  12  motor spins the shaft  14  causing the spinner unit  30  to spin in a substantially horizontal plane. As the spinner unit  30  spins, feed is discharged from the spinner unit through the housing first opening  44  and the housing second opening  46  due to the centrifugal forces acting on the feed. Because of the difference between the housing first and second opening widths W 3  and the housing maximum horizontal transverse width at the inlet W 1 , the feed is discharged in a jetted fashion, and the feed is thrown farther, and more evenly, from the spinner unit than if the widths W 1  and W 3  were equal. 
     Turning now to FIG.  6  and FIG. 7, another exemplary embodiment of a spinner unit  100  of the present invention is shown to include a housing top  102 , bottom  104 , sides  106 ,  108 ,  110 ,  112  that form an interior  118 , and the housing top having an inlet  122 . In this exemplary embodiment, the housing top and sides are shaped to form a housing first opening  114  and second opening  116 , with the housing top having an extension  120  that extends beyond the housing bottom. The extension  120  makes it even more difficult for a bird to access feed through the first or second openings. As shown in FIG. 7 the sides are tapered from the housing top extension to the housing bottom. 
     FIG. 8 depicts another exemplary embodiment of the spinner unit  200  of the present invention. In this embodiment, reflective of spinner unit construction options, a housing top  202  and housing bottom  204  are turned along their edges to form sides joining along seam  206 . In this embodiment, the top, bottom and formed sides enclose an interior  212  and form a first opening  208  and a second opening  210 . The housing top includes an inlet  214  that closely receives the feed storage unit discharge tube  18 . 
     An additional exemplary embodiment of the spinner unit  300  of the present invention is shown in FIGS. 9-11 to have a housing top  302 , bottom  304 , and six sides  306 ,  308 ,  310 ,  312 ,  314 ,  316  that join to enclose an interior  324  through which feed enters from the feed storage unit discharge tube  18 , through housing top inlet  322 . In this exemplary embodiment  300 , the sides are substantially perpendicular to the housing top  302 , and the housing top and bottom are substantially octagonal when viewed in a plane perpendicular to the shaft  14  and parallel to the ground surface  22 . The housing top, bottom and two of the six sides  310 , 316  define a housing first opening  318 , while the housing top, bottom and another two of the six sides  306 , 312  define a housing second opening  320 . When the spinner unit  300  is spun by the shaft  14 , the two sides  310 , 316  adjacent the first opening  318  cause the feed to be discharged through first opening  318  in a jetted fashion. The feed is similarly directed by the sides  310 , 312  adjacent the second opening  320  through the second opening. 
     In the exemplary embodiment of the spinner unit  300  the inlet  322  is approximately 2.5 inches (64 millimeters) and the feed storage unit discharge tube  18  outer diameter is approximately 1.875 inches (48 millimeters), thus the discharge tube is closely received by the inlet, with only an approximately 0.3125 inch (8 millimeter) opening about the circumference of the inlet. 
     In another exemplary embodiment of the spinner unit  400 , as shown in FIGS. 12-12A, a housing similar to that shown in FIG. 1, including a first and second opening, also includes a cover  60  for each opening. The cover has pins  62  that are received for hinged rotation by holes  64  in the sides  36 , 40 , 38 , 42 . The holes are set back from openings  44 , 46  such that when lifted, the covers are prevented from rotating over backwards and on to the housing top  32 . Also, the height of the cover causes a small cover portion to extend beyond the housing bottom  34  when the cover is closed, as shown in FIG.  12 . This prevents the covers from rotating inwardly toward the housing interior  48 . When the spinner unit  400  is stationary, gravity pulls the covers to a closed position, preventing access to feed by birds. When the control unit shaft  14  rotates and spins the spinner unit  400  centrifugal force opens the covers, allowing the feed to be discharged through the openings. 
     Turning now to FIGS. 13-16, an additional exemplary embodiment of the spinner unit  500  of the present invention is shown to have a housing top  502  joined to a housing bottom  506  to enclose an interior  510  and form a first opening  514  and a second opening  516 . The housing top has an inlet  512  for receiving feed from the feed storage unit discharge tube  18 . Aligned with a longitudinal axis running from the first opening to the second opening are a housing top apex  504  and a housing bottom apex  508 . 
     FIG. 15 is a sectional view of spinner unit  500  taken along a cutting plane lying on the maximum horizontal transverse width W 4  measured at the inlet  512 . The inlet has a maximum horizontal transverse width W 5 . The maximum housing width W 4  is greater than the housing first opening  514  maximum horizontal width W 6 , the width W 6  also being the width of the housing second opening  516 . For this exemplary embodiment of the spinner unit  500 , width W 4  is approximately 3.5 inches (89 millimeters), width W 5  is approximately 2.5 inches (64 millimeters), and width W 6  is approximately 1.375 inches (35 millimeters). 
     In such an embodiment, the spinner unit  500  receives feed from the feed storage unit discharge tube  18 , through the inlet  512 , and into the housing interior  510 . The received feed is deposited within the interior along the housing bottom  504  toward the first and second openings  514  and  516 . The housing top  502  covers the received feed proximate the first and second openings and the feed lying on the housing bottom between the openings  514 , 516  and the edge of the inlet  512 . The inlet typically has a diameter of approximately 2.5 inches (64 millimeters) and the feed storage unit discharge tube  18  typically has an outer diameter of approximately 1.875 inches (48 millimeters), thus the discharge tube is closely received by the inlet. This leaves a circumferential opening of approximately 0.3125 inch (8 millimeters) between the inlet edge and the discharge tube  18 . 
     As the control unit shaft  14  spins the spinner unit  500 , the feed in the interior is forced by centrifugal force through the first and second openings in a jetted fashion due to the taper of the housing top and bottom toward each opening. The extensive covering provided by the inlet sizing and the housing top prevents feed from being thrown upwardly from the spinner unit  500 . When the spinner unit  500  is stationary, this covering prevents birds from eating from the top of the spinner unit  500 , and, as can be seen on FIG. 15, the reduced area of the openings  514 , 516 , prevents birds from inserting their heads through the openings to gain access to the received feed. 
     An additional embodiment of the spinner unit  600  of the present invention is illustrated in FIGS. 17-19. This embodiment includes a housing top  602  and housing bottom  604 , both shown to be curved when sectionally viewed at a cutting plane through the housing&#39;s maximum horizontal transverse width W 7  measured at a housing inlet  612 , as shown in FIGS. 18-19. The housing top and bottom join to enclose an interior  610  and form a first opening  606  and second opening  608 . The feed from the feed storage unit discharge tube  18  enters the interior  610  through the inlet  612 , the inlet having a maximum horizontal transverse width W 8 . The housing first and second openings  606 , 608  have a maximum horizontal width W 9 . 
     The maximum housing width W 7  is greater than the housing first opening  606  maximum horizontal width W 9 . For this exemplary embodiment of the spinner unit  600 , width W 7  is approximately 3.5 inches (89 millimeters), width W 8  is approximately 2.5 inches (64 millimeters), and width W 9  is approximately 1.375 inches (35 millimeters). 
     During use, the exemplary spinner unit  600  receives feed from the feed storage unit discharge tube  18  through the housing inlet  612  into the housing interior  610 . The inlet typically has a diameter of approximately 2.5 inches (64 millimeters) and the feed storage unit discharge tube  18  typically has an outer diameter of approximately 1.875 inches (48 millimeters), thus the discharge tube is closely received by the inlet. This leaves a circumferential opening of approximately 0.3125 inch (8 millimeters) between the inlet edge and the discharge tube  18 . Due to the extensive covering of the housing interior by the housing top, and the small circumferential opening around the discharge tube, very little feed is thrown upwardly through the inlet when the spinner unit  600  is spinning. When the unit  600  is stationary, birds are effectively denied access to the housing interior feed and are prevented from thieving feed. As shown in FIG. 19, the reduced area of the openings  606 , 608  prevents birds from inserting their heads through the opening to eat feed from within the interior. 
     FIGS. 21-22 depict an additional exemplary embodiment of a spinner unit  700  of the present invention having a housing top  702  and bottom  704 , and four sides  708 , 710 , 712 , 714  joining the housing top and bottom to enclose an interior  706  and form a first opening  716  and second opening  718 . The housing top has an inlet  720  for receiving feed from the feed storage unit discharge tube  18 . The end view of FIG. 22 illustrates the polygonal shape of the opening  718  as defined by the top, bottom and four sides. The openings  716 , 718  have a maximum height H 3  that is smaller than the maximum horizontal transverse width W 10  of the housing top. In a typical application, height H 3  is approximately 0.75 inches (19 millimeters) and width W 10  is approximately 3 inches (76 millimeters). The top covers received feed in the portions of the interior  706  lying between the edge of the inlet  720  and the openings  716 , 718 , thus preventing feed from being thrown upwardly while the spinner unit  700  is being spun, and interfering with birds attempting to eat feed lying on the housing bottom  704 . The relative height of the openings to the housing top width W 10  prevents birds from inserting their heads into the openings to eat feed, when the spinner unit  700  is stationary. 
     Turning now to FIGS. 23-26, an additional embodiment of a spinner unit  800  of the present invention is shown to have a generally circular-shaped housing top  802  and bottom  804  when viewed in a plane substantially perpendicular to the control unit shaft  14  and substantially horizontal to the ground surface  22 . The housing top and bottom are joined by two sides  806 , 808  to enclose an interior  812 , and form a first opening  810  and a second opening  816 . The second opening is diametrically opposed to the first opening  810  on the circumference of the circular profile of the housing top. Feed is received from the feed storage unit discharge tube  18  through a housing inlet  814  into the housing interior  812 . 
     In this exemplary embodiment of the spinner unit  800 , substantially upright and planar feed guides  818 , 820  are positioned adjacent the first opening and second opening, respectively. The guides extend from the housing top to the housing bottom, and as the spinner unit  800  is spun in a clockwise direction, feed sliding with respect to the housing bottom encounters the guide  818 , slides along the guide, and is discharged through the first opening  810 . Similarly, feed encountering the guide  820  slides along the guide and is forced from the interior through the second opening at reference  816  on FIG.  26 . 
     The housing top  802  covers received feed lying in interior portions between the edge of the inlet  814  and the first and second openings. This is very effective in preventing bird access to feed lying on the housing bottom  804 . As in the embodiment shown in FIG. 3, this extensive covering configuration, and the relatively close receipt of the feed storage unit discharge tube  18  in the inlet  814 , prevents received feed from being thrown up and off of the spinner unit  800  while being spun on the shaft  14 . 
     An additional embodiment of a spinner unit  900  according to the present invention is illustrated in FIGS. 27-29. A housing top  902  and housing bottom  904  are joined by two substantially straight sides  906 , 908  to enclose an interior  914 , and form a housing first opening  910  and a second opening  912 . The housing top is substantially perpendicular to the sides. A housing top inlet  916  receives feed from the feed storage unit discharge tube  18  into the housing interior  914 . In this exemplary embodiment, and as shown in FIG. 29, the sides have a height H 4 , and the housing top has a maximum transverse width W 11 , the height H 4  being less than the width W 11 . In a typical application, height H 4  is approximately 0.75 inches (19 millimeters) and width W 11  is approximately 3 inches (76 millimeters). The housing top covers received feed in the portions of the interior  914  lying between the edge of the inlet  916  and the openings  910 , 912 . The relative height of the openings to the housing top width prevents birds from inserting their heads into the openings to eat feed, when the spinner unit  900  is stationary. Similarly, birds are prevented from eating from feed lying on the housing bottom  904  by the extensive covering provided by the housing top  902  and the close receipt of the feed control unit discharge tube  18  by the housing inlet  916 . 
     FIGS. 30-31 illustrate an additional exemplary embodiment of the spinner unit  1000  of the present invention. This embodiment has a housing top  1002 , bottom  1004 , and sides  1006 ,  1008 ,  1010 ,  1012 ,  1014 ,  1016  that join to enclose an interior  1022  through which feed enters from the feed storage unit discharge tube  18 , through housing top inlet  1024 . In this exemplary embodiment  1000 , the sides are substantially perpendicular to the housing top  1002 , and the housing top and bottom are substantially hexagonal when viewed in a plane perpendicular to the shaft  14  and parallel to the ground surface  22 . The housing top, bottom and two of the six sides  1010 , 1016  define a housing first opening  1020 , while the housing top, bottom and another two of the six sides  1006 , 1012  define a housing second opening  1018 . The extensive enclosure configuration provided by the housing top, sides and bottom, prevent small animal access to the feed within the interior. 
     In the exemplary embodiment of the spinner unit  1000  the inlet  1024  is approximately 2.5 inches (64 millimeters) and the feed storage unit discharge tube  18  outer diameter is approximately 1.875 inches (48 millimeters), thus the discharge tube is closely received by the inlet, with only an approximately 0.3125 inch (8 millimeter) opening about the circumference of the inlet. 
     With respect to the above description then, it is to be realized that the optimum material and dimensional relationships for the parts of the spinner units will include variations in size and materials which will occur to those skilled in the art upon review of the present disclosure. For example, in various embodiments the spinner units are constructed from various metals, woods, and plastics, and can be attached to the control unit shaft using typical attachment devices known in the art, including, but not limited to clamps, welding, and squeeze fitting a collar onto the shaft, wherein the fit is sufficiently tight to retain the collar. Similarly, the collar can be attached to the housing bottom using several methods known in the art, including, but not limited to, rivets, welding, screws or bolts through the housing bottom into a collar with a threaded portion, a threaded member on the collar through the housing bottom for threaded coupling with a nut in the housing interior, and other typical attachment methods. Furthermore, the inlet can be shaped to closely receive and accommodate variously shaped discharge tubes. 
     All equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by the present invention. 
     It will be understood from the foregoing description that various modifications and changes may be made, and in fact will be made, in the exemplary embodiments of the present invention without departing from its true spirit. The descriptions in this specification are for purposes of illustration only and are not to be construed in a limiting sense. The scope of the present invention is limited only by the language of the following claims.