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An adapter provides leveling and elevation adjustment between the grate and strainer head of a floor drain. The strainer head is cemented in hardened concrete and has an upper seat for removably accepting the grate. The strainer head also has a tubular body defining the tubular lumen that is the dra

An adapter provides leveling and elevation adjustment between the grate and strainer head of a floor drain. The strainer head is cemented in hardened concrete and has an upper seat for removably accepting the grate. The strainer head also has a tubular body defining the tubular lumen that is the drain hole. The adapter for the grate has a base ring, a set ring and a plurality of jack screws. The base ring gets seated in the strainer head's seat. The set ring forms a replacement seat for the grate to seat. Jack screws threaded into inboard tabs of the base ring provide elevation adjustment to the overlying set ring. The jack screws are disposed relative the strainer head such that the tip end and lower exposed thread portions thereof occupy and travel in the tubular lumen of the strainer head.

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1. A leveling and elevation adapter for interposition between a removable floor drain grate and a strainer head of a floor drain for a surrounding floor surface defining a local grade therefor, which strainer head is immobilized and encased in a hardened concrete slab, said strainer head comprising

1. A leveling and elevation adapter for interposition between a removable floor drain grate and a strainer head of a floor drain for a surrounding floor surface defining a local grade therefor, which strainer head is immobilized and encased in a hardened concrete slab, said strainer head comprising a tubular body that has an upper end terminating in a primary grate-seat that is characterized by a horizontal flange portion surrounded by a low rim wall, said tubular body defining a central lumen for the strainer head, and, said primary grate-seat sits in a shallow depression below the grade of the surrounding floor surface; said floor drain comprising a funnel-formed drain body, a plate-formed flashing collar disposed covering the funnel-formed drain body, a plurality of flashing-collar bolts to fasten the flashing collar and drain body together, said strainer head comprising a tubular lower section formed with external thread and said flashing collar having a central aperture formed with internal thread for receiving the external thread of the lower tubular section of the strainer head; said adapter comprising: a base ring having an annular outer ring portion sized to be seated in the primary grate-seat of the strainer head;a set ring having an annular outer ring portion that has an upper surface defining a second grate-seat characterized by a horizontal flat run surrounded by a low rim wall and sized to accept the seating of the grate therein;a plurality of horizontally spaced apart jack screws for vertically spacing apart the base ring and set ring by a gap, wherein the jack screws are adjustable to allow a user to change the height of the gap and even the secondary grate-seat with the grade of the surrounding floor; anda construction cement vertically bridging the gap between the base ring and set ring and at least marginally over the concrete slab which when said construction cement hardens, said construction cement provides additional undergirding support to the set ring;wherein the base ring is fastened to the primary grate-seat of the strainer head by a plurality of primary assembly screws through the annular outer ring portion of the base ring and into the horizontal flange portion of the strainer head; andwherein the grate is fastened to the secondary grate-seat of the set ring by a plurality of secondary assembly screws through the grate and into the annular outer ring portion of the set ring. 2. The adapter of claim 1 wherein: the construction cement solidifies the base ring as a monolithic unit with the strainer head. 3. The adapter of claim 1 wherein: the construction cement comprises grout. 4. The adapter of claim 1 wherein: the grade of the surrounding floor comprises the grade of a tile floor. 5. The adapter of claim 1 wherein: while the jack screws are adjustable to allow a user to change the height of the gap and even the secondary grate-seat with the grade of the surrounding floor, the jack screws do not lock the set ring relative to the base ring to fix the height of the gap. 6. The adapter of claim 1 wherein: the construction cement solidifies the set ring and the base ring as a monolithic unit with the strainer head. 7. The adapter of claim 1 wherein: the annular outer ring portion of the base ring comprises an inner edge and an angularly distributed plurality of inboard tabs extending inwards from the inner edge, said tabs being formed with threaded sockets for the jack screws to screw in;each jack screw comprises a relatively long shank extending between a head and a tip end, wherein the heads are adapted to abut and carry the set ring;said base ring's tabs extend inwards sufficiently such that the threaded sockets can be disposed relative the strainer head such that the shanks and tip ends of the jack screws can occupy space inside of and travel in the central lumen of the strainer head. 8. The adapter of claim 7 wherein: the annular outer ring portion of the set ring comprises an inner edge and an angularly distributed plurality of inboard tabs extending inwards from the set ring's inner edge; andwherein said set ring's inboard tabs are located above the tabs belonging to the base ring, whereby the heads of the jack screws are adapted to abut the tabs belonging to the set ring and carry the set ring thereby. 9. The adapter of claim 7 wherein: the annular outer ring portion of the set ring sized to sit flat and flush on top of the annular outer portion of the base ring;the tabs of the base ring have step portions that are contained in a generally horizontal plane generally parallel to a plane containing the annular outer ring portion of the base ring;the plane containing the step portions of the tabs of the base ring lie below the plane containing the annular outer ring portion of the base ring by a measure defined as an offset characteristic of the base ring's tabs;the step portions of the base ring are formed with threaded sockets for the jack screws to screw in, and, the jack screws are provided with heads adapted to abut and carry the set ring on at angularly disposed jack-screw head-bearing locations on the underside of the set ring;wherein the offset characteristic of base ring's tabs is sized to provide an airspace with the angularly disposed jack-screw head-bearing locations on the underside of the set ring when the annular outer ring portion of the set ring is collapsed flush and flat on top of the annular outer ring portion of the base ring, wherein the airspace is utilized for providing vertical clearance for the broadened, enlarged heads of the jack screws. 10. The adapter of claim 1 wherein: the annular outer ring portion of the base ring is characterized by an axial, generally vertical thickness;the grate is characterized by an axial, generally vertical thickness; andthe axial, generally vertical thickness of the grate is equal to or greater than the axial, generally vertical thickness of the annular outer ring portion of the base ring. 11. The adapter of claim 10 wherein: the horizontal flat run of the annular outer ring portion of the set ring is characterized by an axial, generally vertical thickness; andthe axial, generally vertical thickness of the grate is equal to or greater than the axial, generally vertical thickness of the horizontal flat run of the annular outer ring portion of the set ring. 12. A leveling and elevation adapter for interposition between a removable floor drain grate and a strainer head of a floor drain for a surrounding floor surface defining a local grade therefor, which strainer head is immobilized and encased in a hardened concrete slab, said strainer head comprising a tubular body that has an upper end terminating in a primary grate-seat that is characterized by a horizontal flange portion surrounded by a low rim wall, said tubular body defining a central lumen for the strainer head, and, said primary grate-seat sits in a shallow depression below the grade of the surrounding floor surface; said adapter comprising: a base ring having an annular outer ring portion sized to be seated in the primary grate-scat of the strainer head;a set ring having an annular outer ring portion that has an upper surface defining a secondary grate-seat characterized by a horizontal flat run surrounded by a low rim wall and sized to accept the seating of the grate therein; anda plurality of horizontally spaced apart jack screws for vertically spacing apart the base ring and set ring by a gap, wherein the jack screws are adjustable to allow a user to change the height of the gap and even the secondary grate-seat with the grade of the surrounding floor;wherein the annular outer ring portion of the base ring comprises an inner edge and an angularly distributed plurality of inboard tabs extending inwards from the inner edge, said tabs being formed with threaded sockets for the jack screws to screw in;wherein each jack screw comprises a relatively long shank extending between a head and a tip end;wherein the annular outer ring portion of the set ring comprises an inner edge and an angularly distributed plurality of inboard tabs extending inwards from the set ring's inner edge;wherein said set ring's inboard tabs are located above the tabs belonging to the base ring;wherein the heads of the jack screws are adapted to abut the tabs belonging to the set ring and carry the set ring thereby; andfurther comprising a locking screw for each jack screw and paired closely alongside the respective jack screw;each locking screw comprises a relatively long shank extending between a head and a tip end;wherein the tabs belonging to the set ring have through journals for the shanks but not the heads of the locking screws to slide therethrough and spin therein; andthe tabs belonging to the base ring are formed with threaded sockets for the locking screws;said locking screws can be tightened from a slack state, which allows the tabs of the set ring to be lifted off the heads of the jack screws as well as leaves the height of the gap unfixed, to a tightened state, which fastens the set ring fixed with the jack screws and the base ring as well as fixes the height of the gap;whereby with the locking screws slack, turning the jack screws allows changing the height of the gap, after which tightening the locking screws fixes the height of the gap. 13. A leveling and elevation adapter for interposition between a removable floor drain grate and a strainer head of a floor drain for a surrounding floor surface defining a local grade therefor, which strainer head is immobilized and encased in a hardened concrete slab, said strainer head comprising a tubular body that transitions into an upper funnel section that in turn transitions into a primary grate-seat that is characterized by a horizontal flange portion surrounded by a low rim wall, said tubular body defining a central lumen for the strainer head, and, said primary grate-seat sits in a shallow depression below the grade of the surrounding floor surface; said adapter comprising: a base ring having an annular outer ring portion sized to be seated in the primary grate-seat of the strainer head;a set ring having an annular outer ring portion that has an upper surface defining a secondary grate-seat characterized by a horizontal flat run surrounded by a low rim wall and sized to accept the seating of the grate therein;a plurality of horizontally spaced apart jack screws for vertically spacing apart the base ring and set ring by a gap, wherein the jack screws are adjustable to allow a user to change the height of the gap and even the secondary grate-seat with the grade of the surrounding floor;the annular outer ring portion of the base ring comprises an inner edge and an angularly distributed plurality of inboard tabs extending inwards from the inner edge, said tabs being formed with threaded sockets for the jack screws to screw in;wherein each tab of the base ring has a funnel-shaped inclined portion leading down and inwards from the inner edge of the annular outer ring portion of the base ring, to a flat step portion; andwherein the funnel-shaped inclined portions of the tabs of the base ring are contoured to rest on and abut the funnel-shaped portion of the strainer head, and thereby said set ring gaining additional undergirding support from the strainer head. 14. The adapter of claim 13 wherein: each jack screw comprises a relatively long shank extending between a head and a tip end, wherein said heads of the jack screws are adapted to abut and carry the set ring;said base ring's tab extending inwards sufficiently such that the threaded sockets can be disposed relative the strainer head such that the shanks and tip ends of the jack screws can occupy space inside of and travel in the central lumen of the strainer head. 15. The adapter of claim 14 wherein: the annular outer ring portion of the set ring sized to sit flat and flush on top of the annular outer portion of the base ring;the step portions of the tabs of the base ring are contained in a generally horizontal plane generally parallel to a plane containing the annular outer ring portion of the base ring;the plane containing the step portions of the tabs of the base ring lie below the plane containing the annular outer ring portion of the base ring by a measure defined as an offset characteristic of the base ring's tabs;the step portions of the tabs of the base ring are formed with the threaded sockets for the jack screws to screw in, and, whereby the tabs and step portions of the base ring are angularly disposed such that the heads of the jack screws abut and carry the set ring at angularly disposed jack-screw head-bearing locations on the underside of the set ring;wherein the offset characteristic of base ring's tabs is sized to provide an airspace with the angularly disposed jack-screw head-bearing locations on the underside of the set ring when the annular outer ring portion of the set ring is collapsed flush and flat on top of the annular outer ring portion of the base ring, wherein the airspace is utilized for providing vertical clearance for the broadened, enlarged heads of the jack screws. 16. A leveling and elevation adapter for interposition between a removable floor drain grate and a strainer head of a floor drain for a surrounding floor surface defining a local grade therefor, which strainer head is immobilized and encased in a hardened concrete slab, said strainer head comprising a tubular body that transitions into an upper funnel section that in turn transitions into a primary grate-seat that is characterized by a horizontal flange portion surrounded by a low rim wall, said tubular body defining a central lumen for the strainer head, and, said primary grate-seat sits in a shallow depression below the grade of the surrounding floor surface; said adapter comprising: a base ring having an annular outer ring portion sized to be seated in the primary grate-seat of the strainer head;a set ring having an annular outer ring portion that has an upper surface defining a secondary grate-seat characterized by a horizontal flat run surrounded by a low rim wall and sized to accept the seating of the grate therein;a plurality of horizontally spaced apart jack screws for vertically spacing apart the base ring and set ring by a gap, wherein the jack screws are adjustable to allow a user to change the height of the gap and even the secondary grate-seat with the grade of the surrounding floor;said annular outer ring portion of the base ring comprising an inner edge and an angularly distributed plurality of inboard tabs extending inwards from the inner edge, said tabs being formed with threaded sockets for the jack screws to screw in;each jack screw comprising a relatively long shank extending between a head and a tip end, wherein said heads of the jack screws are adapted to abut and carry the set ring; andsaid base ring's tabs being elongated inwards sufficiently such that the threaded sockets can be disposed relative the strainer head such that the shanks and tip ends of the jack screws can occupy space inside of and travel in a projection of the central lumen of the strainer head into the upper funnel section thereof, and thereby avoid grounding out against the upper funnel section. 17. The adapter of claim 16 wherein: the annular outer ring portion of the set ring sized to sit flat and flush on top of the annular outer portion of the base ring;each tab of the base ring has a funnel-shaped inclined portion leading down and inwards from the inner edge of the annular outer ring portion of the base ring, to a flat step portion;the step portions of the tabs of the base ring are contained in a generally horizontal plane generally parallel to a plane containing the annular outer ring portion of the base ring;the plane containing the step portions of the tabs of the base ring lie below the plane containing the annular outer ring portion of the base ring by a measure defined as an offset characteristic of the base ring's tabs;the step portions of the tabs of the base ring are formed with the threaded sockets for the jack screws to screw in, and, whereby the tabs and step portions of the base ring are angularly disposed such that the heads of the jack screws abut and carry the set ring at angularly disposed jack-screw head-bearing locations on the underside of the set ring;wherein the offset characteristic of base ring's tabs is sized to provide an airspace with the angularly disposed jack-screw head-bearing locations on the underside of the set ring when the annular outer ring portion of the set ring is collapsed flush and flat on top of the annular outer ring portion of the base ring, wherein the airspace is utilized for providing vertical clearance for the broadened, enlarged heads of the jack screws. 18. A leveling and elevation adapter according to claim 16 for a floor drain comprising a funnel-formed drain body, a plate-formed flashing collar disposed covering the funnel-formed drain body, a plurality of flashing-collar bolts to fasten the flashing collar and drain body together, said strainer head comprising a tubular lower section formed with external thread and said flashing collar having a central aperture formed with internal thread for receiving the external thread of the lower tubular section of the strainer head; wherein: the base ring is fastened to the primary grate-seat of the strainer head by a plurality of primary assembly screws through the annular outer ring portion of the base ring and into the horizontal flange portion of the strainer head; andthe grate is fastened to the secondary grate-seat of the set ring by a plurality of secondary assembly screws through the grate and into the annular outer ring portion of the set ring. 19. The adapter of claim 16 wherein: the annular outer ring portion of the set ring comprises an inner edge and an angularly distributed plurality of inboard tabs extending inwards from the set ring's inner edge; andwherein said set ring's inboard tabs are located above the tabs belonging to the base ring, whereby the heads of the jack screws are adapted to abut the tabs belonging to the set ring and carry the set ring thereby;the tabs belonging to the set ring are provided with access holes directly above the heads of the respective jack screw in order to allow a screw driver to reach through and turn the respective jack screw; andsaid access holes being smaller diameter than the heads of the jack screws and hence the heads of the jack screws do not pass through said access holes and instead bear against a solid bottom periphery of the set ring that surrounds each of the access holes.