referring now to the figures , and in particular , fig1 - 3 , an embodiment directed to a hanging apparatus adapted to general use in providing removable hang - mounting capability is depicted . for purposes of description , the embodiment is directed by way of an example incorporating a hanging plant basket as the removable hanging article . the hanging plant 1 is carried , via connecting structure 2 , on a male engagement portion 10 a ( fig1 and 2 ). cooperating mounting structure is provided in the form of a female engagement portion 10 b ( fig3 a and 3 b ) which is anchorable , likely in an overhead position , to a support , such as a tree limb or the like ( not shown ), conveniently via a mounting wire 3 and an s - hook 4 . in the depicted embodiment , a suitable shape for the cooperative engagement structure is conveniently provided as a triangular opening 5 ( female ) and a corresponding triangular horizontal outer cross - section ( male portion 10 a ), as best seen in the plan views of fig3 a and 2 , respectively . male portion 10 a is sized for clearance through the opening 5 in female engagement portion 10 b when the two elements are , shapewise , mutually aligned . advantageously , male portion 10 a is formed generally in the shape of a triangular pyramid ( tetrahedron ), the three triangular sides of which intersect along three junction lines 6 which define peaked ridges . female portion 10 b is formed having a receiving space 7 , also having three junction lines 8 created by the angular intersection of adjacent structural surfaces of female portion 10 b , positioned , as shown in fig3 a , relative to opening 5 . mounting of male portion 10 a to female portion 10 b is accomplished by general alignment of male portion 10 a with opening 5 , subsequent insertion upwards of male portion 10 a through the opening 5 and into the receiving space , and relative rotation ( approximately 60 °) to bring male portion 10 a to the position shown in dotted lines in fig3 a . since the triangular shape of male portion 10 a is no longer aligned with opening 5 , when male portion 10 a is then lowered , male portion 10 a shoulders against the surface in the receiving space 7 adjacent to opening 5 on the female portion 10 b . while not critical to the invention , the respective junction lines 6 and 8 of male and female portions 10 a and 10 b advantageously engage one another , inhibiting accidental rotation out of the mounted orientation . to implement dismounting of the male portion 10 a from the female portion 10 b , male portion 10 a is urged upwards to free the circumferential engagement otherwise inhibiting rotation . male portion 10 a is then rotated back into general alignment with opening 5 , and lowered therethrough for separation from the female portion 10 b . turning now to fig4 - 7 , an embodiment directed to a bird feeder is depicted generally at 20 . a bottle 20 a ( a part thereof serving as a male portion ) and a receiving portion 20 b ( serving at least in part as a female portion ) are provided . bottle 20 a has a horizontal cross - sectional shape generally in the form of a cross , advantageously corresponding to a generally matching shape of an opening 25 in receiving portion ( female portion ) 20 b . as an advantageous option , bottle 20 a and receiving portion 20 b include cooperative circumferential engagement structure for inhibiting rotation when mounted to receiving portion 20 b ( analogous in function with the previously described embodiment ). in this embodiment , circumferential engagement structure is included integrally with the structure of a bottle 20 a , provided on a part of the bottle 20 a proximate to a bottle opening 21 . this structure conveniently takes the form of radial ‘ pleating ’ which defines a series of wedge shaped peaks 22 and valleys 23 on the engagement surface of the bottle 20 a , and which function akin to a gear arrangement inhibiting relative rotation when mutually engaged with corresponding peaks 26 and valleys 27 provided on receiving portion 20 b ( see fig5 a , wherein bottle 20 a is shown in dotted lines oriented in position of engagement ). as in the previous embodiment , to accomplish mounting of bottle 20 a with receiving portion 20 b , bottle 20 a is held in an inverted orientation with bottle opening 21 facing downward and is inserted upward through the opening 25 in receiving portion 20 b ( the latter positioned as shown in fig5 b when hanging , for use , from a support ( not shown ) via a mounting member 28 and s - hook 29 , as shown in fig6 ). advantageously , as depicted in fig4 and 5 b respectively , the peaks 22 and valleys 23 of bottle 20 a , serving as part of the male portion , and the peaks 26 and valleys 27 formed in receiving portion 20 b , serving as part of the female portion , are radially tilted at an angle θ relative to a horizontal plane , such that when rotationally brought to a mounting position , bottle 20 a remains naturally centered in opening 25 in receiving portion 20 b when resting in shouldered engagement atop receiving portion 20 b . referring to the assembled depiction in fig6 , a bird feeder 20 ′ embodies an advantageous variation of the aforementioned features , and in which a modified receiving portion 20 b ′ includes a skirted outer portion 20 b ″. the overhanging hooded structure provided by skirted outer portion 20 b ″ blocks access to a feeding station 24 from above by rodents ( most commonly , squirrels ), and serves as a squirrel baffle to discourage unwanted visitation and stealing of feed . feeding station 24 can be of any suitable conventional design , and includes for example , a series of feed access openings 24 a internally communicative with a contents of bottle 20 a , and perches 24 b on which birds can alight to access feed access openings 24 a . it will be understood that the principles described above can be implemented in a wide array of bird feeder designs without departure from the contemplated invention . for example , while the engagement structure of the bottle 20 a in the above described embodiment is carried on the portion thereof proximate to the bottle opening 21 , such structure can alternatively be disposed at a portion distant from an opening , proximate instead with a base of a bottle of suitable design , as exemplified below . referring now to fig8 - 11 , another embodiment of the invention directed to a bird feeder , is depicted generally at 30 . as shown in fig9 and 10 , bird feeder 30 includes a receiving portion 30 b ( a part thereof serving as a female portion which is structured and functions in general accordance with the above described principles ) and a replaceable portion 30 a ( a portion of which functions in turn as a male portion within the constraints of the disclosure herein ). replaceable portion 30 a , as shown in fig8 , is advantageously depicted in the form of a disposable , pre - filled cartridge bottle assembly for replacement to the receiving portion 30 b , as needed , and includes a feed containing reservoir in the form of a suitably shaped bottle 31 , a feeding station 32 and a foil cap 33 which sealably closes an advantageously threaded bottle opening 31 a to protect the feed contents from exposure to air and spillage . the male portion 31 b is provided in the form of a flared base portion of the bottle 31 , and includes a series of wedge shaped peaks 34 and valleys 35 which advantageously function akin to the analogous wedge shaped peaks 22 and valleys 23 provided on the engagement surface of the bottle 20 a of the prior described embodiment , which were described as mutually engaging with corresponding peaks 26 and valleys 27 provided on receiving portion 20 b ( as shown in fig5 a ) in that embodiment . as depicted in fig8 , the feeding station 32 is advantageously assembled to the bottle 31 while existing in the form of a feeding cartridge bottle assembly prior to reorienting reassembly in advance of replacement to the receiving portion 30 b ( as subsequently shown in fig9 and 10 ). in this regard , when a feed replacement operation is to be implemented , the bottle assembly comprising the replacement portion 30 a of fig8 is reoriented to the condition shown in fig9 , wherein the foil cap 33 is removed , and the feeding station 32 , originally engaging the flared base ( male portion 31 b ) of the bottle 31 for advantageous packaging compactness , is threadably replaced to the opening 31 a of the bottle 31 . feeding station 32 includes a seed tray in which feed transferred from bottle 31 is presented to animals , and a threaded opening portion 32 a having cutouts , slots , openings or the like ( slots being depicted in the example ) suitably placed such that when threadably installed to the bottle opening 31 a as shown in fig9 , feed contents of the bottle 31 are transferred by gravity to the feed tray portion 32 b for consumption by birds or other creatures , as shown in fig1 . a handle portion 32 c is optionally provided to facilitate installation of the bottle assembly replacement portion 30 a into receiving portion 30 b , the details of which are described below . receiving portion 30 b includes a top 36 and an annular base 37 interconnected by a series of circumferentially spaced bars 38 . while not depicted in the figures relating to this embodiment , a structure in accordance with that shown at 20 b in fig5 a and 5 b is provided inside top 36 , for engaging the male portion 31 b when the replacement portion ( bottle assembly is slidably inserted into the opening in annular base 37 and moved upwards , in a manner as described with respect to the prior embodiment . when rotated relative to the top 36 and then lowered , the bottle assembly receiving portion 30 selectively engages the female portion within top 36 and is retained within receiving portion 30 b , as shown in fig1 . the bars 38 advantageously serve as a barrier to larger birds and squirrels . the feeder 30 is retained to a support , conveniently by an s hook 29 ′ retained to top 36 . various embodiment of the invention are contemplated as taking a wide variety of shapes and cooperating structural configurations , without departure from the invention . two examples of possible arrangements are described below . referring now to fig1 - 15 , a feeding apparatus according to a further illustrative embodiment of the invention is shown , generally designated 40 . feeding apparatus 40 includes a mounting structure in the form of a hanger 41 adapted ( in the current example ) for suspended mounted reception to an overhead support a tree limb or the like , conveniently by means of a hook 43 . it will be understood , however , that the mounting structure 41 can take another form , suitable instead for mounting atop a pole or the like . also , as shown , the hanger 41 can be screwed into , or otherwise fastened to , a wall or other vertical structure , for example , by screws 43 a . a reservoir , conveniently in the form of a bottle 42 for containing feed is also provided , shaped specifically ( i . e ., advantageously , an outer envelope thereof ) for engaging the hanger 41 , in a manner retaining same in a stable hanging state ( shown in fig1 and 15 ). bottle 42 presents a generally t shape , with a base 42 a ( upper portion , as being shown inverted ) thereof being laterally extended in opposed directions such that these portions engage hook - shaped hanger arms 41 a of hanger 41 for suspended support . a width of the bottle 42 ( i . e ., the diameter when of a circular cross - section ) at its vertical extent 42 b above ( or below , in the drawings , as being shown inverted ) the laterally extended base region 42 a is dimensioned to fit between a bottle receiving opening 41 b of the hanger 41 , to allow the two lateral extensions of the base 42 a of the bottle 42 to be cradled by the corresponding hook - shaped hanger arms 41 a when lowered onto them . removal is accomplished simply by lifting the bottle upwards out of the cradled position , and bringing the bottle 42 free of the hanger 41 through the bottle receiving opening 41 b ( shown by dotted lines in fig1 ). for purposes of proper functionality , a feeding station member 43 , conveniently of conventional design ( alternatively inventive design ), is received to the bottle 42 at an opening thereof 42 c , advantageously threaded thereto . turning now to fig1 and 17 , another embodiment of a feeding apparatus is depicted , generally designated 50 . feeding apparatus 50 includes a mounting structure provided in the form of a hanger 51 including a horseshoe - shaped portion 51 a and a hanging support 51 b extending over and an above the opening in horseshoe - shaped portion 51 a . the hanger 51 can be mounted to a support , as in the previous embodiment , by a hook 54 a , screws 54 b , or other fasteners or the like . a laterally facing opening 51 c in horseshoe - shaped portion 51 a permits a bottle 52 of suitable configuration , for example , conveniently of conical taper , as shown in fig1 , to be inserted laterally from the front ( shown by a dotted outline ) in a direction of arrow a into horseshoe - shaped portion 51 a , and then lowered in a direction of arrow b until it seats against horseshoe - shaped portion 51 as the local diameter of bottle 52 increases to match an interior diameter of horseshoe - shaped portion 51 a . the steps for installation are simply reversed to remove bottle 52 when emptied of feed . it will be apparent that any other structural shape that functions in an analogous manner will be within the contemplated scope of the invention , and that , for example , the bottle need not be conical , but can take a stepped shape , spherical shape received in a matching internal configuration , etc . as shown in fig1 , a feeding station 53 , for example , of typical design , is fastened ( for example , by threads ) to bottle 52 , such that when inverted and mounted to hanger 51 , feed is present for animals ( birds ) to consume . because each of the reservoirs ( bottles ) 20 a , 31 , 42 and 52 in the previously described embodiments is inverted to transfer feed contained therein to a feeding station , and is therefore closed at the end facing upwards when inverted for use , each respective structure readily lends itself to production by inexpensive blow molding techniques and materials . also , as mentioned above , while the examples are specifically directed to versions in which the bottles themselves serve as a portion of the engagement mechanism cooperative with the mounting structure , it is also deemed to be within the contemplated scope of the invention to instead configure a structural portion or portions carried on , or assembled to , the bottles , for example , the feeding station , such that it , or they , engage the mounting structure to achieve the removable suspended condition of the general type discussed above . having described preferred embodiments of the invention with reference to the accompanying drawings , it is to be understood that the invention is not limited to those precise embodiments , and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined in the appended claims .
an apparatus and method allows at least a reservoir portion of a bird feeder to be relieved of its mounted hanging condition and replaced thereto in a facilitated manner . a mounting structure normally remains in an attached state with an elevated support , such as a tree limb , pole or the like , and a bottle or other reservoir for containing feed material is selectively engageable therewith . advantageously , cooperating structure of the reservoir itself and the mounting structure allow coupling and uncoupling of each . by virtue of this arrangement , when exhausted of feed , a spent reservoir can be easily removed from its suspended above - ground state , and either refilled and replaced , or more preferably , simply recycled and replaced with a new pre - filled reservoir / reservoir assembly , in the manner of a cartridge .