Abstract:
There are generally two styles of modern bird feeders: the tubular feeder with a tubular reservoir and several perches attached to the tubular reservoir at various positions around the reservoir, and the more traditional rectangular bin style with one or two feeding stations. These bin feeders are constructed to feed only general bird seed of mixed variety and are not selectively configurable to feed a specific small seed like thistle. The disclosed bin feeder includes removable and repositionable bin sidewalls with appropriately shaped upper and lower longitudinal edges to exclusively provide appropriate openings for thistle feed along one of the longitudinal edges or an appropriate opening for generally larger seed along the other of the longitudinal edges.

Description:
BACKGROUND 
     This application claims benefit from provisional patent application Ser. No. 61/330,842 which was filed May 13, 2010. 
     A traditional style of feeder for presenting seed to wild birds is the hopper style. This feeder is usually rectangular with a gable roof to protect the bin containing the seed, and a pair of window sidewalls forming the front and back walls for the bin. These sidewalls form a slot at the bottom of the bin for the seed in the bin to spill out onto a tray. Birds stand along the edges of the tray and feed from the spilled seed that seeps below the sidewalls of the hopper into the tray. 
     It is usual for these two sidewalls to be made of transparent material, usually a rectangular panes of plastic. This permits the owner of the bird feeder to see from a distance whether the bin needs to be refilled with birdseed. 
     Another type of feeder available from Cedar Works includes a single transparent sidewall made of a polymer sheet. This sidewall has a single notch along one edge. This sidewall can be removed from the slots in which it normally rests, the slots extending along the edges of the lateral walls. These lateral walls are made of wood. The transparent sidewall is accessed through a hinged lid which normally overlies the upper edge of the sidewall. This sidewall can be removed and flipped over, placing the notch either along the top edge or bottom edge of the sidewall. When the notch is positioned at the upper edge of the sidewall this feeder is intended for squirrels only. The owner of the feeder can enjoy watching this squirrel lift the hinge lid and reach inside to feed on the corn or other seeds in the bin. Alternatively the sidewall can be placed so that the single slot is located at the bottom. In this condition the seed is able to spill out on to the flat trough in front of the sidewall, so that birds as well as squirrels can be feed simultaneously from the same supply of seeds. 
     However there are other styles of feeders, for example tube style feeders that are intended to feed birds only. Among such tube feeders are feeders with very small restricted feed ports sized to permit small birds such as finches to access thistle seeds, apparently one of such small bird&#39;s favorite foods. Other feeders have a substantially larger port for feeding larger seeds to larger species of birds. There are also tube type feeders with adjustable or two position feeder ports. These feeders have rotating or sliding shutter that changes the size of the seed port from that appropriate for feeding the small thistle seeds, or alternatively the shutter is moved to expose or create a larger port for the passage of large seeds. 
     SUMMARY 
     Disclosed is a bin type feeder for wild birds with gable roof and adjustable perches that can be spaced controllably from a pair of oppositely facing sidewalls with feeding troughs at the lower edges of these sidewalls. These sidewalls are removable and reversible so that small feeder ports located along one longitudinal edge of the sidewall can be positioned either along the bottom edge adjacent the feeding trough to form a feeder specifically designed to feed small thistle type seed, or the sidewalls can be inverted to properly position a single broad slot or arch formed along the bottom edge of the sidewall. In this configuration the bin type feeder is appropriate for feeding bird feeds that include large seeds like sunflower seeds, with the small thistle-sized ports positioned along the uppermost edge of the sidewall out of access or contact with the supply of seed contained in the bin. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         FIG. 1  is the perspective view of the bin type feeder according to this disclosure with thistle type ports aligned along the lower edge of the removable transparent sidewall. 
         FIG. 2  is an exploded view of the parts is to assemble the bin type feeder of  FIG. 1 . 
         FIG. 3  is an elevation view showing the sidewall in place in slots along the side of the bin. 
         FIG. 4  is an elevation view of the removable and adjustable sidewall. 
         FIG. 5  is the perspective view of sidewall of  FIG. 4 . 
         FIG. 6  is the sidewall with the thistle type seed ports along its upper edge and the single open arch forming a large seed port along the bottom edge. 
         FIG. 7  the close up view of the finger operated detained latch located at the ridge of each gable end of the gable roof. 
         FIG. 8  shows a partially transparent view of the bin with the gable roof slid upwardly to expose the upper edges of the bin sidewalls. 
         FIG. 9  is a close up view of the bin with the lid removed. 
         FIG. 10  is a perspective bottom view showing the adjustable perch assembly. 
         FIG. 11  is a detailed perspective view of the adjustable perch assembly. 
         FIG. 12  is a detailed view of the combination pole support and adjustable perches. 
         FIG. 13  is a close up view of the detent used to control the positioning of one of the two adjustable perches. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to the accompanying figures, the feeder  10  has a bin  75  with sides that include at least one removable sidewall  22 , and end walls  16 , shown here as gable ends. All sides have edge portions, sidewall edge portions  73  and end wall edge portions  74 , some of which, specifically the inward facing grooves  20  on the end wall edge portions  74 , are sized and positioned to releasably hold a portion of the removable sidewalls. 
     As seen in the figures, the disclosed bin feeder  10  for wild birds is preferably made of an assembly of eight injection molded parts, and five fasteners. The hopper chassis  11  is an injection molded part with a substantially horizontally extending base which forms the floor  14  of the seed supply bin and generally upstanding end walls  16  integrally molded with the base. These end walls define a generally trapezoid shape with a wider upper portion and narrower bottom portion. The end walls are held in proper position by the hopper hanger panel  18  which extends across the upper most edges of the end walls. The hopper panel is fastened to the end walls at each end by a single self-tapping pan head screw. 
     A pair of adjustable perches is attached to the bottom surface of the bottom wall by the perch mount. The pair of adjustable perches and perch mount will be detailed below. 
     As shown in the figures, the end walls of the hopper chassis have inwardly facing grooves  20  to receive the corresponding edge portions of pair of specially formed sidewalls. These sidewalls  22  and  22  are preferably comprised of rectangular panels of die-cut polymer sheeting. These sidewalls are preferably transparent or at least translucent to permit the owner to assess at a glance whether the supply of seed contained in the seed bin formed between the end walls the removable side walls  22  and beneath the roof  12  is adequate or needs to be replenished. 
     Above all these parts and assemblies, a roof extends to shelter most of the rest of the construction from precipitation. The roof preferably has a gently sloping gable shape with protruding gable ends  30  and protruding rake edges  32  that form an overall look of a small gabled house. A robust wire or cable hanger  34  extends from a point where it is fixed at the geometric centre of the ridge beam portion  36  of the hanger panel  18 , then up through a hole through the corresponding center of the roof, to an attachment loop at its distal end. As will be detailed, the roof has a pair of flexible finger-operated detents or latches  38  and  38  that snap onto and release from protrusions at the ridge of the gable ends of the hanger panel. Once the latches  38  are released the roof can be slid upwardly on the hanging wire to permit access to the large rectangular opening at the top of the bin for replenishing the seed in the bin hopper. 
     The removable roof also permits the side walls to be removed and selectively repositioned for dispensing either small thistle-type seed or larger general type seed, as will be detailed. 
     The removable and reversible sidewalls  22  are generally of uniform thickness but have a specific and precise overall planar shape. The shorter sides are gently curved to correspond approximately to the curving shape of the bin chassis end walls and to slide into and out of the slots  20  mentioned above formed between portions of the hanger panel and the hopper chassis  11 . The longitudinal bottom edge  42  (refer to  FIGS. 4 and 5 ) is generally straight with a row of several, preferably about a dozen, small elongated slots or ports  44  spaced just above the lowermost edge. These slots are sized to dispense in a controllable manner thistle seed and to help restrict larger birds from accessing the thistle seed. The sizing of these thistle seed ports is well known in the industry, but preferably these thistle seeds ports are about 3½ mm wide×1 cm tall and round at the top and bottom. A single long arch shaped indentation constitutes the majority of the upper longitudinal edge  46  of the side wall panel. This has an overall dimension approximately 10 to 12 cm in overall width and about 2 cm tall. For thistle feeding, both panels are placed in their respective slots  20  on each side of the bin chassis with the thistle ports  44  along at the lower edge as shown in  FIGS. 4 and 5 . If the user decides to feed larger seeds, each of the side walls is removed from their slots  20 , flipped over, and positioned as shown in  FIG. 6 , that is, with the large arch shaped indentation  46  facing downwardly and thus aligned along the bottom-most portion of the seed supply. Consequently the thistle seed ports are along the now upper edge of the side wall in close proximity to the roof when the roof is in its latched position. 
       FIG. 7  shows a detail of the latching engagement formed along at the upper edge of the bin and walls and the corresponding portion of the hopper hanger panel. A single sloping detent is formed in the end of the hopper panel which normally rests in a correspondingly shaped opening in the centre of the flexible finger-operated latches  38  at each end of the roof. This latch is designed to resist accidental opening and to resist being opened by a hungry squirrel or the like. 
     When assembled in the thistle seed feeding configuration as seen in  FIG. 9  the thistle ports are lined in close proximity to the bottom of the bin, adjacent the feeding trough  48  integrally formed along each lateral edge the bin floor. The bottom of the bin floor arches up in the middle to help move the supply of seeds towards these thistle ports at the feeding station for feeding such small birds. Each of the two perches can be adjusted accordingly as will be detailed. 
     Referring to  FIG. 10 , the relationship of the adjustable perch assembly  50  and the rest of the bird feeder can be seen. The adjustable perch assembly  50  is positioned inboard of the floor edge portions  76 . One can see the pair of feeding troughs  48  and  48  adjacent the perches  52 . These are relatively small feeding troughs to retain the seed immediately next to the thistle ports or to the single arch large seed port. Projecting beyond the edge of each trough, an arc-shaped elongated perch  52  is cantilevered from the bottom of the bin by a detented support arm  54 . Each perch has a structural member  56  which helps support the relatively small diameter stick-like perch grip. The detented elongated support arm is integrally formed with this arch shaped support, forming a single injection molded construction. 
     The upper surface of the elongated support  54  includes a series of indentations or detents  58  which receive an end of a flexing finger  60  integrally formed in the perch mount  62 . This flexing finger ratchets into and out of the indentations to hold the perching at an optimum position spaced from the outermost edge of the feeding trough. 
     Referring to  FIGS. 11 through 13  the hopper perch mount  62  has the overall shape of a Z. The center portion  64  forms a cylindrical cavity which is continuation of the cylindrical receiver  68  in the floor of the hopper chassis, and thus forms a fairly secure and convenient pole mount if the owner chooses to support the in feeder on a slim pole. This is sometimes desirable since the feeder is designed to feed birds only, not squirrels. Sometimes squirrels can be prevented from accessing the bin feeder by fastening it to a tall, smooth pole to keep squirrels from reaching the feeder by climbing the pole, and erecting the pole far from trees where a squirrel might jump down onto the feeder from an adjacent tree. 
     The perch mount also includes two laterally extending perch support receivers  70 . These have correspondingly shaped rectangular holes in the opposed walls of each receiver, one wall having the integrally formed detent finger extending from its outer face. Note that the distal end of the perch support includes a detent finger  72  that flexes into the rectangular holes of the receiver  70  of the perch mount when the perch support is first inserted into the perch mount, but springs outwardly to prevent the perch from being completely removed from the perch mount. When the bin feeder is sold, the perches are pushed into and up against the lower edge of the bin chassis for reduced shipping volume and display but each perch can be pulled out to an optimum position for the particular birds sought to be attracted to the feeder by ratcheting the perch support out to that position. The perch supports are offset from one another to permit the supports to bypass each other in this fully retracted or collapsed state, as well as pass to each side of the pole mounting receiver or cavity. When erected and set to feed birds, the owner would pull outwardly on the perch support to the chosen perch position, which position will be held by the disclosed detent ratchet, etc.