in order that the invention may be more fully understood , it will now be described , by way of example , with reference to the accompanying drawings in which fig1 through 5 illustrate a preferred embodiment of the present invention wherein an apparatus for golf putting practice is disclosed and fig3 a and 3b disclose alternate embodiments . turning to fig1 therein is shown a prior art heating and ventilation air conditioning ( hvac ) vent register 12 having a housing 14 containing a plurality of movable vanes 16 and a vane control means 18 as would be provided in the standard manner by one skilled in the art . it should be noted that the vent register 12 has a flange 20 for contacting a floor surface of a room ( not shown ) along with a lower extended wall 22 of the housing 14 which connects in the standard manner to an under floor outlet ( not shown ) of a hvac system of a building in which the hvac system is installed . turning to fig2 therein is shown the apparatus for golf putting practice 10 which is complementarily sized and shaped as vent register 12 as shown in fig1 . the apparatus for golf putting practice 10 has an upper surface 24 which is sized to conform to or mate to the floor level of the room ( not shown ) in which the hvac system is installed and is typically 290 mm long by 140 mm wide . the apparatus for golf putting practice 10 also has therein at least one golf cup 26 which is regulation sized as specified by the united states golf association ( usga ) depending approximately 38 mm from the upper surface 24 . the apparatus for golf putting practice 10 also has a lower wall 28 , also depending from the upper surface 24 roughly 38 mm which supports the bottom of the golf cup 30 , and which connects in the standard manner to an under floor outlet ( not shown ) of an hvac system . the apparatus for golf putting practice 10 also has on the upper surface 24 a simulated hazard 36 formed by an irregularly shaped opening in upper surface 24 adjacent to the golf cup 26 with a plurality of stationary vanes 40 running beneath the opening of the simulated hazard 36 transverse to the long axis of the upper surface 24 between the lower walls 28 . the apparatus for golf putting practice 10 also has on upper surface 24 a flag mounting boss 42 in which a plastic pin and flag 38 may be inserted . turning to fig3 therein is shown the apparatus for golf putting practice 10 along with the elements previously disclosed and in addition thereto , disclosing the bottom of the golf cup 30 with a plurality of apertures 32 and the simulated hazard 36 through which air from the hvac system may flow . turning to fig4 therein is shown the apparatus for golf putting practice 10 along with the bottom of the golf cup 30 and lower wall 28 and other elements previously disclosed . turning to fig5 therein is shown the apparatus for golf putting practice 10 along with a plurality of stationary vanes 40 attached perpendicularly between the lower walls 28 transverse to the long axis of the apparatus for golf practice 10 running beneath the simulated hazard 36 . also the cup wall 34 is shown which extends from the upper surface 24 to the bottom of the cup 30 at both ends of the cup 26 and from one side of lower wall 28 to the other side of lower wall 28 on circular arc with a radius of approximately 57 mm . the bottom of the cup 30 is shown having approximately a diameter of 114 mm with either side truncated at the cord created by the intersection of the diameter of the bottom of the cup 30 and the lower walls 28 . the lower wall 28 which slips into the hvac outlet ( not shown ) is sized to fit into a standard hvac outlet and the corners are chamfered to reduce interferences with damaged hvac outlets corners . also the plurality of apertures 32 in the bottom of the cup 30 which allow air to flow through the apparatus for golf putting practice 10 and other elements previously disclosed are illustrated . in fig3 a , therein is shown an alternative embodiment as in fig3 except with the addition of a second golf cup 44 disposed adjacent to golf cup 26 in place of the simulated hazard 36 and the pin and flag 38 and the pin and flag mounting boss 42 are eliminated . in fig3 b , therein is shown another alternate embodiment as in fig3 except the opening in upper surface 24 for golf cup 26 is centered in the upper surface and the simulated hazard 36 and the pin and flag 38 and pin and flag mounting boss 42 are eliminated . in the preferred embodiment of the apparatus for golf putting practice 10 , the upper surface 24 , the simulated hazard 36 , a plurality of stationary vanes 40 , the lower wall 28 , the flag mounting boss 42 , and the golf cup 26 are all molded in one integral shot of an injection grade thermoplastic material such as acetal . however the assembly could be molded of any plastic material that is injection grade , can withstand the fluctuating temperatures of a standard home heating and air conditioning duct , and that can be green in color to simulate a grass surface such as polypropylene , abs ( acrylonitrilebutadienestyrene ) or nylon . the upper surface 24 may also be textured to simulate putting green grass . the apparatus for golf putting practice may also be made of stamped and drawn metal as would be done in the standard manner by someone skilled in the art and the upper surface 24 may be coated in such a manner as to simulate a putting green surface . the manner of using the apparatus for golf putting practice 10 is to remove one of the floor mounted vent registers 12 in an office or home and replace it with the apparatus for golf putting practice 10 , inserting the apparatus for golf putting practice 10 deep enough into the hvac outlet opening ( not shown ) such that the top surface 24 is parallel with the top of the floor covering carpet ( not shown ). this assures a smooth transition between the carpet and the upper surface 24 , allowing a putted golf ball to roll unimpeded toward the golf cup 26 . as in a regular putting contest , golfers wanting to practice their putting may stand at varying distance from the apparatus for golf putting practice and strike regulation golf balls ( not shown ) with a regular golf putter ( not shown ) in the direction of the golf cup 26 , suspended below the upper surface 24 . the apparatus for golf putting practice may be removed and stored easily and the original vent register 12 reinstalled when the practice activity is completed . however , this is not necessary as the apparatus for golf putting practice 10 is unobtrusive and contains sufficient openings for air flow as to not disrupt the heating or cooling of the room in which it is installed . the two golf cup embodiment as shown in fig3 a and the single cup embodiment as shown in fig3 b are utilized in the same manner as the preferred embodiment just described . the second golf cup 44 shown in fig3 a being disposed adjacent to the first golf cup 26 can be used either by a second golfer or to give the single golfer two different golf cups to putt towards on slightly different lines . accordingly , the reader will see that the apparatus for golf putting practice provides : ( a ) an apparatus for golf putting practice that is small , compact , and unobtrusive when installed in an office or home ; ( b ) an apparatus for golf putting practice in which the golf cup is sized to meet united states golf association ( usga ) regulations ; ( c ) an apparatus for golf putting practice that disposes the golf cup below floor level ; ( d ) an apparatus for golf putting practice which duplicates the unfettered nature of an actual putt ; ( e ) an apparatus for golf putting practice that replicates the sound and feel of making a putt in a usga regulation golf cup ; and ( f ) an apparatus for golf putting practice that utilizes the existing floor covering as the putting surface with no additional mats or tracks . while i have explained my invention in detail with the aid of exemplary embodiment thereof , it will be understood that the invention is not limited to the specific constructional details shown and described by way of example , which may be departed from without departing from the scope and spirit of the invention .
the present invention discloses an apparatus for golf putting practice wherein the present invention is an insert having at least one regulation size golf hole disposed therein wherein the insert is complementarily sized and shaped to be inserted into the outlet opening of a conventional heating and ventilation air conditioning system as might occur in the floor of a home or office building replacing a standard vent register . the insert is sized to be removably secured internal of the hvac outlet so that it can be easily inserted and removed therefrom .