various embodiments of the present invention are described hereinafter with reference to the accompanying drawings . it should be understood that these illustrations are not to be taken as actual views of any specific apparatus or method of the present invention , but are exemplary representations employed to more clearly and fully depict the present invention than might otherwise be possible . additionally , elements and features common between the drawing figures retain the same numerical designation . the drawings , however , are sufficiently detailed that one skilled in the art could construct an apparatus of the type described and illustrated . fig1 is a plan view of the upper surface of a golf practice green apparatus 10 according to a first embodiment of the present invention . the practice green comprises three panels , a center panel 20 , a side folding panel 30 , and an additional side folding panel 40 . an edge of center panel 20 abuts an edge of side folding panel 30 at common joint 22 . hinges 50 are placed on the top surface 60 of panels 20 and 30 and fasten them together across common joint 22 . likewise , an edge of center panel 20 abuts an edge of side folding panel 40 at common joint 24 . hinges 50 also fasten panels 20 and 40 together across common joint 24 . the hinges 50 may be positioned on the lower surface of the panels or recessed into the panel edges to be within the joint between adjacent panels . recessed or bottom placed hinges may require the joints 22 and 24 to be more open and / or for the edges of the panels to be curved to accommodate the upward folding of a side panel with respect to the center panel . fig2 is an end ( elevational ) view of the golf practice green shown in fig1 , illustrating the top impact surface 60 and bottom surface 70 of each of the panels . fig1 and 2 illustrate the golf practice green in a first configuration , in which the top surface 60 of each of the panels 20 , 30 , and 40 forms a co - planar continuous target surface , that would be used on a golf driving range for practicing golf swings , strokes , shots , etc . the practice green is placed anywhere on a driving range or course , while golfers attempt to hit balls from a “ tee ” area onto the practice green . an operator of a driving range often would like to transport practice greens between different driving ranges or from the driving range to the location of a special event or competition . such transportation often requires the practice green to be transported over state and federal highways . the effective width w 1 shown in fig1 of typical practice greens is almost universally greater than the width allowed for vehicles by local laws , making transportation difficult if not impossible . the present invention allows a golf practice green to quickly be transformed into a second configuration as shown in fig3 , in which the effective width of the practice green has been significantly reduced to w 2 . in this second configuration , side folding panel 30 has been folded over the top of center panel 20 along common joint 22 . side folding panel 40 has also been folded over the top of center panel 20 and a portion of side folding panel 30 . the practice green apparatus 10 has been designed such that when placed in the second configuration , the effective width w 2 is within the legal limits allowed for transportation over roadways . the apparatus can then be placed on a trailer or other vehicle and transported over the road . when the hinges are positioned on a lower surface or recessed , the side panels may not be foldable into a flat , overlapped position , but each may form an acute angle with respect to the upper surface of the center panel , thus decreasing the effective width to a permissibly transportable width . while having the side panels fold flat against one another is generally preferable , having the panels positioned at an acute angle is acceptable so long as the height of the side panel outer edges does not exceed the height permissible for clearance of underpasses , tunnels and the like . fig4 is an end view of a golf practice green apparatus 11 according to a second embodiment of the present invention . the practice green apparatus is similar to that in the first embodiment , except that hinges 50 have been placed on the bottom surface 70 of panels 20 , 30 , and 40 , and a support frame 80 has been attached to the bottom surface 70 of center panel 20 . the support frame 80 comprises two wheels 84 mounted on an axle 82 that supports a frame structure 88 that positions panel 20 a predetermined height above the ground over the axle and wheels . the support frame further comprises a hitch device 86 for attachment to the tow hitch of a vehicle . the practice green of this embodiment may be a trailer or of a fold - down construction that may be used without wheels and placed upon a separate trailer . in a first configuration , panels 30 and 40 are positioned horizontally , as shown by panel 40 in fig4 , such that the top surface 60 of panels 20 , 30 , and 40 forms a co - planar continuous target surface . the apparatus would be placed in the first configuration when it is being used as a golf target on a driving range . if it is desired to move the apparatus to a different location that requires transportation over a roadway , panels 30 and 40 can be folded downward relative to center panel 20 at the hinges 50 as shown by panel 30 in fig4 . the hitch device 86 can be used to connect the apparatus to a separate vehicle to tow the apparatus along the roadway to the desired location . while not specifically illustrated in fig4 , it should be understood that the apparatus would include all other elements necessary to make the apparatus capable of legal transportation along the roadway , such as tail lights , brakes , etc . the apparatus may also be constructed with two axles and sets of wheels if the size of the apparatus or the law so requires . a wheeled structure of this type is further advantageous inasmuch as it could be easily towed to different locations on a golf driving range . fig5 is a side view of a golf practice green apparatus 12 according to a third embodiment of the present invention positioned over a separate trailer vehicle . in this embodiment , the apparatus again comprises panels 20 , 30 , and 40 . hinges 50 are placed on the top surface 60 of panels 20 , 30 , and 40 as in the first embodiment . support legs 90 are mounted to the bottom surface 70 of center panel 20 with pivot joints 92 . in a first configuration , support legs 90 are extended 90 ° downward relative to center panel 20 and panels 30 and 40 extend horizontally as in the first configuration of the first and second embodiments . legs 90 are of sufficient length to position the panels a predetermined height above the ground when the apparatus is in the first configuration . if it is desired to move the apparatus to a different location that requires transportation over a roadway , panels 30 and 40 can be folded over the top of panel 20 as shown in fig3 . a separate trailer vehicle 95 can then be positioned underneath the apparatus , legs 90 are folded using pivot joints 92 such that they extend horizontally as shown by the right leg 90 in fig5 , thereby lowering the apparatus onto the trailer 95 . the trailer and golf practice green apparatus can then be legally towed over the road to the desired location . while the present embodiment uses legs that pivot to lower the apparatus onto the trailer , it would be understood that any design of the leg that allows for changing of configuration , such as a retractable or collapsible ( telescoping ) leg , would be suitable for use . in addition , the bed of a truck or other suitable vehicle may be used to tow the golf practice green apparatus instead of a trailer if it is so desired . fig6 , 7 and 8 show a golf practice green apparatus 110 according to a fourth embodiment of the present invention . fig6 is a top plan view of apparatus 110 in a first configuration , while fig7 and 8 are end views of the apparatus in the first configuration and a second configuration , respectively . the practice green apparatus comprises a first panel 120 and a second panel 130 . the apparatus further comprises a support frame structure 180 , which comprises a horizontal base member 184 connected to vertical members 186 , which are further connected to horizontal support members 182 . panels 120 and 130 are connected to horizontal support members 182 by u - bolts 188 , such that the panels are free to rotate about the horizontal support members . in the first configuration , panels 120 and 130 extend horizontally such that the top surface 160 of the panels forms a co - planar and continuous surface as shown in fig7 . if it is desired to move the apparatus to a different location that requires transportation over a roadway , panels 120 and 130 can be rotated about horizontal support members 182 until they extend substantially vertically as shown in fig8 , thereby reducing the effective width of the apparatus . while the panels are illustrated as being folded inwardly , they also could be folded outwardly to nest along the outside of the structural framework . outward folding may be desirable for very wide panels so they do not exceed permissible height regulations when folded into a vertical orientation . the practice green apparatus can then be placed on a trailer or other vehicle and transported legally over roadways . it would be understood that the apparatus of the fourth embodiment could also be constructed with an integral support frame structure and aligned wheels , such as that disclosed in the second embodiment , thereby allowing the golf green apparatus itself to be towed directly behind a vehicle without the need of a separate trailer . the horizontal base member 184 could , for such latter purpose , be an axle or axle support . fig9 and 10 illustrate a golf practice green apparatus 210 according to a fifth embodiment of the present invention . the apparatus comprises a rigid tubular u - shaped frame member 282 . a canvas or other suitable fabric panel 220 is fastened to , and extends across the area enclosed by , u - shaped frame member 282 . the apparatus further comprises an additional rigid generally tubular u - shaped frame member 284 attached to an additional canvas panel 230 . as is seen in the cross - sectional view of fig1 , taken along line 11 — 11 of fig1 , generally tubular frame member 284 is larger in cross - section than tubular frame member 282 . the inner open diameter of tubular frame member 284 is slightly larger than the outer diameter of tubular frame member 282 so that tubular frame member 284 may slide telescopically over tubular frame member 282 . panel 230 is attached to the top surface of tubular frame member 284 , while panel 220 is attached to the inside surface of tubular frame member 282 . a slot 290 is formed in tubular frame member 284 along the inside surface thereof , such that when tubular frame member 284 slides telescopically over tubular frame member 282 , panel 220 passes through the slot 290 in tubular frame member 284 . also , the canvas or fabric panel may be attached by spaced loops to the frame members so that the panels fold , accordion style , to permit the telescoped compact condition of the frame members . in the first configuration as shown in fig9 , tubular frame member 284 slides telescopically over tubular frame member 282 only a short distance , providing a relatively large golf target surface . if it is desired to move the apparatus to a different location , tubular frame member 284 can slide telescopically over a substantial portion of tubular frame member 282 as shown in fig1 , thereby reducing the effective width of the apparatus . the practice green apparatus 210 can then be placed on a trailer or other vehicle and transported legally over roadways . it would be understood that the apparatus of the present embodiment could also be constructed with an integral support frame structure , such as that disclosed in the second embodiment , thereby allowing the golf green apparatus 210 itself to be towed directly behind a vehicle without the need of a separate trailer . while a telescopically sliding concentric tubular mechanism has been disclosed as a preferred embodiment , other mechanisms allowing panel 230 to slide over panel 220 , such as wheels and a track , sliding cams , etc ., are considered to be within the scope of the present invention . it is to be understood that while means for locking the moving parts of the preferred embodiments into their respective first and second configurations have not been discussed in detail , such as pins , latches , straps , etc ., such features are beneficial and considered to be within the scope of the instant invention and within the skill of one skilled in the mechanical arts . while not specifically illustrated in the figures or incorporated into the preferred embodiments , it is to be understood that additional features commonly used with such practice greens , such as a “ cup ” or “ hole ,” pin , flag , and target circles , may be readily incorporated into the design of the practice greens illustrated in the preferred embodiments of the present invention . additionally , golf ball impact sensing means can be placed on the top impact surface of the practice greens , and used in conjunction with lamp means or other signaling means to relay information about the location of the impact of the golf ball on the target surface of the practice green to the golfer . with respect to the fabric upper surface referred to as part of fig9 , 10 and 11 , the fabric may be an open mesh where the openings are considerably smaller than a golf ball . a spider - web structure of wires with sensing devices at the intersection of the web members may be laid over the fabric surface or clipped by suitable clipping means to the under surface of the fabric to provide sensing means suitably connected to a lighting system upon a central flag pole , for example , wherein differently colored lamps illuminate to indicate how closely a ball hit proximate to the “ pin .” the practice green , when equipped with impact sensors , has an electrical power source , such as a battery , fuel cell , or internal combustion generator , which provides electrical power to provide illumination to certain lamps when a ball impacts upon the putting green surface at a particular distance from the “ pin .” the easily transportable practice green of the instant invention is particularly advantageous inasmuch as it can be equipped with wheels in various embodiments so that the green may be towed by a golf cart , for example , to different locations on a driving range or golf course , so that chip shots , sand shots , and mid - range iron shots can be practiced at various distances . the greens of the instant invention may be equipped with an encircling skirt which depends from the outer perimeter of the green to reach , preferably , to the ground . the skirt may thus prevent golf balls from rolling under the green whenever they are hit short of the green . the skirt is preferably readily detachable from the green structure so that it is not harmed or worn whenever the green is folded and transported . the lower margin of the skirt may be weighted in order to contact the ground firmly to prevent rolling golf balls from rolling under the skirt . the skirt may further be utilized as a space for advertisement or similar uses . further , the skirt may provide support for small lamps , leds or the like to signal “ hits ” near the pin or as illumination during night - time use of the green . the skirt may be an integral unit or composed of discrete , depending fabric panels . it is further within the scope of the invention that a suitable motor can be incorporated into the practice green structure to power the wheels to make the device a self - powered mobile device for movement from one location on a golf course or driving range to another location on the course or range . the motor can be a battery powered electric motor or a small internal combustion engine or similar power device . finally , while each of the preferred embodiments illustrate a flat planar golf ball impact surface , it is well known within the art to provide an impact surface that is contoured both for the function of simulating a natural golf green , or for the purpose of providing a mechanism for gathering golf balls to a particular location or for rolling off the golf green . golf practice green apparatus capable of achieving multiple configurations having a contoured or sloped impact surface are considered to be within the scope of the present invention . also , each of the preferred embodiments discloses practice greens having a periphery shaped as a circle or a rectangle . it is understood that practice greens having any peripheries or any geometric shape , or any arbitrary pattern are considered to be within the scope of the present invention .
a golf practice green apparatus is provided which is capable of transforming between multiple configurations . a first configuration is best suited for actual use as a target green on a golf driving range or the like . in a second configuration the effective width or other dimension of the apparatus is significantly reduced to allow for practical and legal transportation of the golf practice green apparatus over a roadway .