referring to fig1 there is shown a bird repeller assembly , generally designated 10 , comprising a body 11 , rotationally mounted on a pole or standard 12 secured by a pair of metal or plastic bands 14 , 14 to the piling 15 of a dock 16 . as may be seen best in fig2 - 4 , body 11 comprises a barrel section 18 having a plurality of fins 20 each adjacent to a corresponding vent opening 22 . each fin 20 is attached to the barrel 18 by an elongated hinge segment 24 and preferably has a pressed out cup - like portion or indent 26 for enhancing the catching of a wind current or other air flow produced by the prevailing wind as represented by arrow w . the vents 22 are preferably formed by stamping or otherwise cutting out the fins 20 from the wall of barrel 18 . the wind provides an airflow over the fins 20 which causes the body 11 to rotate in the adirection of arrow r ( fig2 ) due to the concave curvature of the fin surface 27 , and the convex curvature of the fin surface 25 . this rotation is enhanced by the cupping action of the fin indent 26 , which projects from the convex fin surface 25 in the rotational direction r and has a concave surface 29 and a convex surface 31 ( fig4 ). a head section 28 above barrel 18 is rotatably secured to the top or distal end of pole 12 by a screw 30 that passes through a bearing washer 32 and is threaded into a cap 34 adhered to the distal end of the pole . below the barrel 18 is an acoustic section 36 formed integrally with a neck 38 having accordion - like convolutions 40 . the inner surface of the convolutions 40 form ridges 42 that rub and beat against the pole 12 as the rotor body 11 rotates relative thereto . this rubbing and beating action causes vibratory noise and clacking reverberations that are amplified by the acoustic section 36 . as an optional feature , one or more shakable noisemakers , such as a plurality of bells 39 , may be attached to the pole 12 , which vibrates and thereby shakes the noisemakers to produce additional bird repelling noise in response to the rubbing action of the rotor neck against the pole . the wind currents , which produce rotation of the rotor by impacting against the fins , also pass over the fins and through the vents 22 thereby generating a whirring noise . in other words , wind currents pass through the upwind vent openings oriented toward the wind arrow w and into the inner chamber 44 of the rotor 11 , and then pass out of the chamber 44 through the downwind vent openings oriented away from the wind arrow w . this wind current air flow , in combination with rotation of the repeller body 11 , is believed to be the source of the whirring noise observed during prototype testing . in addition , the rubbing and beating action of the neck against the pole generates a clacking noise having a constantly changing rhythm or reverberation cycle . referring now to fig5 there is shown a second embodiment of the invention wherein the same numeral part designations have been used to indicate structural elements identical with those shown in fig1 - 4 . in the modified or second embodiment shown in fig5 the rotary connection between the rotor body 11 and the top of the pole 12 is significantly different from that shown in fig3 . in the second embodiment , a lag - bolt , generally designated 50 , has a head 51 engaging the outer surface of head section 28 , and a threaded shaft 54 that passes through the head section 28 and is secured thereto by a pair of anchor arms 52 - 52 . the lag - bolt 50 is of conventional design wherein thc arms 52 - 52 are initially folded so as to pass through an aperture 53 in the center of the head section 28 , and then the arms 52 - 52 are expanded against the underside of the head section 28 , as shown in fig5 by rotation of the lag - bolt shaft 54 in response to rotation of its head 51 by a screwdriver , wrench or other conventional tool . after the lag - bolt is secured in the position shown , the neck 40 of the rotor is slipped over the top of the mounting pole and the rotor is lowered until the distal end of the bolt shaft 54 rests within and against the bottom of a cup 58 secured to a pole cap 60 , such as by an adhesive 62 where the pole cap 60 is made of plastic , or by soldering or welding where the pole cap 60 is made of metal . as an alternative , the cup 58 and the pole cap 60 may be made of the same material and formed as a single - piece , integral structure . when assembled as shown in fig5 the distal end of lag - bolt shaft 24 rests on the bottom of cup 58 and the shaft rotates within the cup 58 and supports the rotor body 11 for rotation in response to the wind . the fins , vents , neck and remaining structure of the second embodiment function in the same manner as those of the first embodiment as described above . however , since the distal end of shaft 54 rests freely within the cup 58 , the second embodiment may be operated only in an upright position such as that shown in fig5 whereas the first embodiment may be operated either in an upright position , such as shown in fig1 or in an inverted position , such as where the opposite or proximate end of pole 12 is secured to an overhead structure , e . g ., a roof beam of a dock shelter , porch roof or the like . the bird disturbing visual effects provided by the spinning fins may be enhanced by placing designs , such as the holographic eyes 46 shown in fig5 on one or both sides of one or more of the fins . the designs may include a light reflective material , such as sparkling particles 48 , that reflect light in a flashing manner during rotation of the rotor in the presence of light . the reflective material also may be used without a design , as shown in fig2 on one or both sides of one or more of the fins . as shown in fig6 - 8 , another embodiment of the bird repeller in the invention may be made from a one - half gallon round plastic container or bottle having a body 11 ′ with six ( 6 ) cup - like protrusions or bosses 77 projecting radially outward from its side , these projecting bosses or cup - like portions having been formed as an integral part of the body 11 ′ by molding , stamping , pressing out or the like . the body 11 ′ also includes a barrel section 18 ′, an acoustic section 36 ′, a neck section 38 ′, and a neck mouth opening 79 which is approximately 1 ¼ inch in diameter . the following additional supplies may be used in making this embodiment of the bird repeller : a # 10 , ¾ inch stainless steel phillips head screw 30 ; a washer 32 having an aperture for receiving screw 30 ; a section of ¾ inch pvc pipe 12 preferably at least three feet in length ; a pvc rounded end cap 34 for the ¾ inch pvc pipe 12 ; and decal stickers 45 depicting eycs 46 and glitter 48 . the following tools may be used to assemble the foregoing supplies : a sharp knife 65 , a drill ( not shown ), { fraction ( 3 / 16 )} inch and { fraction ( 7 / 64 )} inch drill bits ( not shown ), and a phillips head screw driver ( not shown ). the embodiment of fig6 - 8 may then be made in accordance with the following steps : 1 . using the sharp knife 65 , cut shapes corresponding to the desired fins 20 ′ out of the bosses 77 at six ( 6 ) substantially equally spaced positions around the side wall of the container body 11 ′ by cutting along a cut line 67 that represents the base where the boss 77 transitions into the cylindrical wall of the barrel 18 ′ ( this differs from the embodiments of fig1 - 5 , wherein the fin 20 includes a small portion of the cylindrical barrel wall , and produces a lighter weight fin 20 ′). before cutting , make marks 68 and 69 on the barrel wall and cut along line 67 from mark 68 to mark 69 , leaving thc fin 20 ′ attached to the barrel 18 ′ by a deformable hinge portion 24 ′. in fig7 boss 89 is uncut , boss 91 is being cut by knife 65 , and boss 93 has been cut to form a shape corresponding to that of fin 20 ′. then , bend each fin outward until it extends from the wall of barrel 18 ′ so that a tangent t to the hinge portion and to the distal inner edge of the fin makes an angle f in the range of about 20 ′ to about 90 °, preferably about 30 ° to about 60 °, more preferably about 40 ° to about 50 °, most preferably about 45 °, relative to a radial line l from the spin axis represented by the axis of screw 30 as shown in fig7 . the tangent t touches the innermost surface of the hinge portion 24 ′ and the outermost inner edge of the fin at its distal end 33 ′. 2 . drill a hole in the top center of the bottom 72 of the bottle using the { fraction ( 3 / 16 )} inch drill bit . 3 . drill a hole in the top center of the pvc cap 34 using the { fraction ( 7 / 64 )} inch drill bit . 4 . insert a top portion of the ¾ inch pvc pole 12 through the mouth opening 79 of the bottle neck 38 ′ and push the top portion of the pole through one of the fin openings 22 ′. 5 . push the pvc cap 34 onto the projecting top end of the ¾ inch pvc pole 12 using hand pressure until it is tightly secured by a friction fit or by a pvc adhesive . 6 . retract the top portion of the pole back into the bottle and align the pvc cap hole with the hole in the bottom 72 of the bottle . 7 . secure the bottom 72 to the cap 34 with the # 10 , ¾ inch stainless steel phillips head screw 30 passing through the aperture of washer 32 , being careful not to over tighten and making sure that each fin 20 ′ extends substantially along the tangent t as described in step 1 . 8 . test the resulting bird repeller body 11 ′ by spinning it , and adjust the screw 30 as needed to make sure the body 11 ′ spins freely . 9 . optionally , stickers 45 with eyes 46 and / or glitter 48 may be secured to one or both sides of the fins 20 ′ on the body 11 ′. 10 . a number of different methods may be used to attach the bottom of the pole to a dock piling 15 or other fixed structure so that the pole is fixed in a substantially vertical position . the attaching methods include the straps 14 shown in fig1 or alternatively by first attaching to piling 15 with straps 14 , or with screws and / or nails , a section of 1 inch pvc pipe that will accept the bottom of the ¾ inch pole , in the same manner that a fishing rod holder supports the rod on a boat . referring now to fig8 and 9 , on the exterior surface of the bottom wall of the inverted bottle , which is the top wall 72 of the head section 28 ′ of the repeller body 11 ′, there may optionally be mounted a housing 71 enclosing from the weather a noise device that mimics the sound of a bird of prey or other predator . this noise device may comprise a solar cell 73 , a rechargeable battery 74 , a sound chip 75 , and a speaker 76 that emits the sound of the predator to scare birds away form the area to be protected . solar cell 73 is electrically connected to battery 74 by wires 84 and 85 , battery 74 is electrically connected to chip 75 by wires 80 and 81 , and chip 75 is electrically connected to speaker 76 by a wire 83 . wire 83 passes through an aperture 87 in the top wall 72 because the speaker 76 is preferably mounted within the hollow chamber of body 11 ′ so that the sound emitted by the speaker passes freely ( loudly and clearly ) through the vents 22 ′. while specific bird repeller assemblies and methods for their manufacture have been described and illustrated in detail , it will be apparent to those skilled in the art that many modifications and variations are possible without deviating from the broad scope of the present invention . for example , other types of rotary connections may be used to mount the head of the rotor on the distal end of the pole . in addition , the rotor and the pole may be made of a variety of materials , and the neck , acoustic section , barrel , head section , fins and vents may have a wide variety of shapes and sizes . thus , the specific embodiment described herein is for the purpose of illustrating the present invention , and persons skilled in the art will recognize variations thereof that fall within the scope of this invention , which is limited only by the claims appended hereto , and the equivalence of the features described therein .
a method of making an assembly for repelling birds from a selected area , including forming fins and vents on a rotor and rotatably mounting the rotor on the distal end of a support member , the proximate end of which is adjusted to be fixed within the selected area . the fins and vents on the rotor arc responsive to wind currents to rotate the rotor and generate bird repelling noises and visual effects . the fins may include light reflective and / or other design indicia to enhance the visual effects . an electrical sound producing device may be mounted on the rotor for emitting the sound of a bird predator .