as best shown in fig1 and 2 , the invention is a ball receptor 10 that includes a flexible , resilient ball collecting body 12 having a flexible ball discharge tube 14 . the collecting body is formed from fabric or similar sheet material . a support means of more rigid material maintains the collecting body in its desired shape . this support means may include a frame 16 that carries the body 12 and , in turn , is carried by support arms 18 . the support arms may be joined to a frame base 20 that is adapted to be mounted on a ball return machine . the receptor provides a broad gathering surface in collecting body 12 that may be located under a basketball hoop for recovering any balls shot in the area near the hoop . the collecting body 12 guides the balls toward the flexible ball discharge tube 14 , where the flexible nature and preselected diameter of the tube permits the balls to drop through substantially in single file , without jamming . thus , the ball receptor 10 is suited for use with substantially any ball return machine that can receive and handle balls presented in single file . the ball collecting body 12 is preferred to be formed of a flexible fabric such as netting . for this reason , the body 12 may be referred to as the net . a circular , large diameter net is preferred , such as an eleven to twelve foot diameter . at its circumference the round disk of net material is attached to a more tightly woven , stronger fabric ring or perimetric sleeve 22 , which may the formed of canvas or nylon . as shown in fig3 this fabric ring may be formed into a circular tube or sleeve at the perimeter of the net , and the tube may receive the metal frame 16 . both edges of the fabric ring 22 may be sewn to the net in order to close the tube , or the ring may be closed by snaps , laces , velcro , or other types of fabric fastening means . the tube forms one or more notches 24 in its outer edge , which provide a passage for insertion or removal of the net frame 16 . the number and location of the notches 24 are desired to correspond to the number and location of hinges 26 in the frame 16 , as will be more fully described below . generally , the notches will be even in number , preferrably four , and equally spaced about the perimeter of the net . the ball discharge tube 14 is preferred to be attached to the net near its center and to be of substantially uniform diameter throughout its length . this tube may be formed of a flexible material such as strong textile fabric , for example canvas . from its central location , the tube 14 depends from and tensions the center of the net and causes the net to assume a conical or funnel - like shape , leading into the tube . the face of the net itself is relatively flat or at an acute angle to the ground , with thirty degrees being a typical approximate angle of inclination . basketballs striking the net face are captured by the yielding flexibility of the net and then are guided toward the discharge tube inlet . it is desirable for the net to be under sufficient tension that it has some resilience or &# 34 ; life ,&# 34 ; so that the balls are kept rolling toward the bottom of the funnel shape . the diameter of the tube is slightly larger than the diameter of a basketball or whatever other ball is to be used with the receptor . however , this tube diameter should be less than one and one - half times the diameter of the ball , with the preferred diameter range being from one and one - third to one and one - quarter times the ball diameter . the single preferred diameter of the tube is approximately one - quarter larger than the diameter of the ball , with the result that two balls cannot both have their centers of gravity over the inlet of the tube . for example , it has been found that in the single preferred embodiment that returns basketballs , which are about ten and one - half inches in diameter , the diameter of the tube should be approximately thirteen inches , plus or minus one - quarter inch . it is believed that a similar ratio between ball diameter and discharge tube diameter will result in the reliable , single file feeding of other types and sizes of balls . thus , the balls received in the net are drawn by gravity to the discharge tube , where the balls pass freely down the tube . the flexibility and tension of the net and the tube discourage the balls from jamming or wedging at the inlet of the discharge tube , with the result that the discharge tube reliably feeds the balls in single file . as shown in fig8 the lower end of the discharge tube may include a means for fastening the tube to the frame base 20 , for example by one or more straps 26 or like fastening means . the straps 26 may be buckled to the desired degree of tightness , which also establishes the slope of the net and places the net and discharge tube under tension . four straps 26 are preferred , equally spaced about the circumference of the outlet . the straps maintain the net in a lively condition so that balls feed rapidly to the discharge tube and do not nest on the net . the frame base 20 provides an anchor point for the straps 26 and defines a central ball passageway that is generally aligned with the ball discharge tube . the straps 26 maintain the outlet of the discharge tube in the desired alignment with the passageway . the frame base 20 may be square and may be joined to the lower end of the support arms 18 , one at each corner of the square frame . the arms 18 also establish a fixed separation between the base frame and the net frame . the discharge tube is preferred to have its outlet above the base frame , so that the lower edge of the outlet may be held in tension from the frame 20 by the straps 26 . for use with basketballs , the lower edge of the discharge tube is preferred to be about three inches above the frame 20 . in addition , as balls fall through the discharge tube , the sides of the tube have no rigid objects nearby to interfere with or jam the balls within the tube . only after the balls fall free of the tube in single file do they pass through the passageway of the frame , where jamming is no longer a problem . with further reference to fig8 it is shown that the frame 20 may have associated vertical corner tubes 28 that receive the lower ends of the support arms in telescopic engagement . some or all of the corner tubes also may include depending pins 30 that can be used to align the frame base on an associated ball return machine of any suitable type , not shown . the alignment pins 30 may mate with suitable holes at the sides of the ball inlet of the return machine , thus placing the receptor in the desired position to feed balls into the machine . two such alignment pins are adequate to establish the location of the frame base on the ball return machine . the remaining two corner tubes 28 may terminate at their lower ends 32 flush with the frame 20 and may rest passively on the ball return machine . the alignment pins 30 also may be used to trigger a micro - switch on the ball return machine , so that the machine is protected from operation without having a net in place . net frame 16 is formed of tubular sections 34 joined together by hinges 36 to define a ring or other desired shape , corresponding to the perimeter of the net 12 . when the frame 16 is inserted in the net sleeve 22 , the hinges 36 line up with the notches 24 and are exposed . in this exposed position , the hinges may be folded without removing the frame 16 from the sleeve , which simplifies storing the net and frame . fig3 shows that the support arms 18 carry a channel shaped cup 38 at their upper ends , which cup 38 fits partially around a hinge 36 to support the hinge and net frame in open position . thus , the entire net and net frame are mounted on the support arms merely by resting under gravity in cups 38 . in addition , the straps 26 secure the net frame in this position by providing a tensioning force . fig4 shows details of the hinges 36 that join the tubular sections 34 . each hinge includes a shank portion 40 that fits telescopically within an end of the open core of a tubular section 34 . at the outer end of the shank is a hinge head 42 of larger diameter than the open core , limiting the distance to which the shank can be received within the core . each head 42 is slotted to receive one - half of a hinge plate 44 , each hinge plate being shared between two heads of the same hinge . a pivot pin 46 extends through each head and the contained portion of the plate , locking the plate and two heads together . thus , the hinges are double pivoted by having two pivot pins in each head . the hinge heads 42 are beveled at facing edges 48 in the direction of folding . further , as shown in fig5 and 6 , the hinge plate has curved corners 50 at the inside edge of the plate facing the direction of fold . thus , the hinges 36 permit the net frame sections 34 to move between unfolded positions as shown in fig4 and 5 , wherein the sections are substantially aligned end - to - end , such as in a circle , and folded positions as shown in figure 6 , wherein the sections are folded parallel to each other . the hinges will not fold in reverse direction from unfolded position . when in unfolded position , the net frame is held against reverse folding by face - to - face contact between non - beveled facing edge portions 52 , as shown in fig5 . the hinges are able to permit the frame sections to fold into substantially parallel positions . in fig5 and 6 , the aperture 54 in the hinge plate is shown to be l - shaped with two perpendicularly extending lobes 56 and 58 , which permit the hinge to accommodate parallel positions of the frame sections by sliding the pin 46 into the appropriate lobe of the aperture . lobes 56 extend longitudinally of the hinge plate and receive the hinge pins when the net frame is in unfolded position as shown in fig5 . lobes 58 extend laterally of the hinge plate and receive the hinge pins when the net frame is in folded position as shown in fig6 . when the net frame has four hinges as shown in fig1 and 2 , the hinges are arranged in first and second pairs . each pair is divided on substantially opposite edges of the net frame , for example by being diametrically on opposite sides of the ring . the first hinge pair is oriented to pivot in substantially the same direction , for example to enable the net frame to be folded from a full circle into a half circle . thus , the pivot axes of the first pair would lie substantially in the plane of the net frame when the frame is in unfolded position . the first pair of hinges are further oriented to allow the half circles of the net frame to fold in an upward direction from the hinges . thus , when the net frame is in unfolded position , the first pair of hinges is locked against allowing the net frame to collapse downwardly from the hinges . by supporting the net frame at the first pair of hinges , the support arms cause the net frame to remain unfolded and locked in open position at these hinges . the second hinge pair is offset around the net frame by ninety degrees from the first pair . these second hinges have their pivot axes substantially perpendicular to the plane of the net frame when the frame is in unfolded position and , thus , are rotated ninety degrees from the pivot axes of the first pair . thus , these hinges are inoperative when the first hinges are in unfolded position . from unfolded position , the direction of fold of both of the second hinges is toward the center of the net frame , such that these hinges are opposed to each other in direction of fold . the second hinges are further locked in unfolded position by being received in the semi - cylindrical shaped channels of the support arm cups 38 . however , when the net frame is folded on the first hinges , the second hinges are moved into a position of being substantially juxtaposed and foldable in the same direction . thus , for example , if the net frame is folded upwardly into a one - half circle , the second hinges will be located at the top of the juxtaposed semi - circles and will have substantially aligned pivot axes . the direction of fold will be downward . the semi - circle of the net frame will fold into an &# 34 ; x &# 34 ; shape as shown in fig7 . thus , the large circle of the net and frame as shown in fig2 can be collapsed into the extremely compact configuration of fig7 . because the net and discharge tube are of flexible fabric , these elements will fold with the net frame and are compact . as an aid to assembling or disassembling the receptor , an assembly stand 60 is provided . this stand may be used to support the frame base 20 when the base is off of the ball return machine . the stand includes its own square base 62 similar in size to base 20 . a pair of upstanding supports 64 receive and support the bottom 32 of the corner tubes 28 that do not have depending pins 30 . a pair of shorter supports 66 receive and support the pins 30 on the remaining two corner tubes 28 . in operation , the receptor is assembled by placing stand 60 on the floor and placing frame base 20 on the stand . then , the support arms 18 are placed in the corner tubes in such a manner that they extend diagonally outwardly from the corners of the frame 20 . the net and net frame than are unfolded into a full circle and set in the grooves of the cups 38 on the tops of the support arms . the entire receptor then can be mounted to the desired associated ball return machine and the pins 30 can be set into the associated holes in the machine . once the receptor is in place , the straps 26 can be attached to the frame 20 and tightened to the desired degree . the receptor is disassembled in approximately the reverse procedure . first the straps 26 are removed from the frame base 20 , after which the receptor is removed from the ball return machine and placed upon the stand 60 . thereafter , the net frame is lifted off the cups of the support arms . then the net frame is folded first into a half circle and second into an &# 34 ; x &# 34 ; shape . the support arms are lifted free of the frame base . the parts then may be stored in a realtively small area . the foregoing is considered as illustrative only of the principles of the invention . further , since numerous modifications and changes will readily occur to those skilled in the art , it is not desired to limit the invention to the exact construction and operation shown and described , and accordingly all suitable modifications and equivalents may be regarded as falling within the scope of the invention as defined by the claims that follow .