fig1 illustrates a schematic of the manufacture of the mesh which forms the basis for the invention . a sheet of metal material 1 moves in the direction of arrow 3 underneath a serrated cutting die 5 ( see fig2 ) which moves up and down as seen at arrow 7 . ( other portions of the die are not shown ) the process of mechanically advancing the plate or sheet 1 beyond the face of the bottom of the die is well known in the metal processing field . the sheet is mechanically advanced an amount equal to the strand width of regular expanded metal before flattening . the top cutting die 5 then descends and simultaneously slits and cold forms an entire row of half - diamonds . the top die then ascends and moves one half - diamond to the right as the sheet 1 moves forward one strand width . the top die then descends , slits and forms another full row of half - diamonds completing a row of full diamonds in two strokes . the die then ascends , returns to its initial position and begins to form another row of half - diamonds , repeating the process until a sheet of expanded metal is completed , as seen in fig3 . it will be appreciated that as the die descends , the sheet material is cut and stretched in order to form the diamonds . the depth of the die - cut regulates the size of the diamond which is important in regulating the size and type of feed with which the expanded mesh is used . fig4 illustrates a common type of peanut feeder 11 formed of expanded mesh 13 and having a cylindrical sidewall . after the expanded mesh is formed , the punched sheet is flattened in order to permit easier working and forming of the bird feeder . the edges of the flattened mesh are welded to form a cylinder , and the finished feeder is then painted by means of a conventional electrostatic process . the bottom can also be formed of the expanded mesh or can include a separate bottom 15 and a top 17 . a hook 19 is attached to or forms a part of a steel rod 21 which extends through the center of the body and is attached to the bottom . the size of the mesh of the peanut feeder , as well as with the other feeders discussed below , is selected to conform with the bird feed to be placed in the body . in other words , the mesh of a peanut feeder will be substantially larger than the mesh associated with , for example , a thistle feeder . fig5 illustrates a multi - walled feeder 25 having a conventional base 27 , a square or rectangular expanded mesh body 29 and a pair of angled roof members 31 , one of which is pivoted about a hinge 33 to permit feed to be placed in the body portion 29 . a typical hanger 35 is used to attach the feeder to a tree limb or the like . fig6 illustrates a two - sided , standard hopper feeder 41 having a platform 43 , a pair of sides 45 and a roof formed by a pair of members 47 hinged at 49 . a hanger 51 is attached to the roof for the purpose of suspending the feeder from a tree or the like . a pair of plexiglass feed - retaining members 53 are connected between the sides 45 . a conventional triangular member ( not shown ) may be inserted in the center of the feeder between walls 45 in order to displace the feed toward a pair of openings 55 between the bottom of the plexiglass members 53 and a base or floor 59 of the feeder . the novel portion of the instant hopper feeder as seen in fig7 is the inclusion of expanded steel mesh 57 extended between a pair of wood members 59 . fig8 illustrates the mesh 57 inserted in a groove 61 in members 59 . the mesh 57 is used in this feeder , in place of the woven or welded wire mesh of the prior art , to permit drainage . the woven or welded wire mesh , lacking the rigidity and strength of the instant expanded mesh , is normally attached to the top of members such as 59 and is normally either very heavy or includes multiple layers to provide the strength to hold the feed without overly sagging or breaking away . fig9 and 10 illustrate a seed catcher tray 71 having a plurality of side members 73 with the expanded mesh 75 extending therebetween . as with the floor of the hopper feeder , the mesh 75 is inserted in grooves 77 in the side members 73 . a center member 79 extends between a pair of the sides 73 and supports a conventional pole receiving support 81 , a pole 83 seen inserted therein . the height of the tray on the pole is adjusted by means of a thumb screw 85 . the seed catcher tray is normally mounted underneath a hopper feeder which is positioned at the top of a pole , and its function is to prevent the seed from falling to the ground . thus , the birds can feed from a hopper feeder mounted at the top of the pole and from the catcher tray . the invention also comprises the method of constructing bird feeders from the expanded mesh material . while several embodiments of the invention have been described , it will be understood that it is capable of further modifications , and this application is intended to cover any variations , uses , or adaptations of the invention , following in general the principles of the invention and including such departures from the present disclosure as to come within knowledge or customary practice in the art to which the invention pertains , and as may be applied to the essential features hereinbefore set forth and falling within the scope of the invention or the limits of the appended claims .
bird feeders of various shapes are formed at least partially of an expanded steel mesh material . the mesh is formed from thin sheet metal which is slit , expanded and formed into a portion of a bird feeder body .