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A cover system in use with a pavement slab, a communicating and downwardly extending manhole tube extending from the slab. The system includes a substantially annular shaped and three dimensional frame, encased within the pavement slab and such that a top edge extending surface of the frame lies sub

A cover system in use with a pavement slab, a communicating and downwardly extending manhole tube extending from the slab. The system includes a substantially annular shaped and three dimensional frame, encased within the pavement slab and such that a top edge extending surface of the frame lies substantially flush with a corresponding top edge surface of the slab. The frame further includes an inwardly facing, annular extending and recessed ledge in communication with the manhole tube. A cover is seatingly engaged and supported upon the recessed ledge, such that an upper edge surface of the cover is substantially flush with the top edge extending surface of the frame. A plurality of locking fasteners are arrayed at an angle relative to a perpendicular axis extending through the cover and the frame. The fasteners insert within corresponding angular recesses established between the frame and the cover and are displaceable between a locking position, in which the cover is rigidly secured to the frame and an unlocked position, in which the cover is removable from the frame.

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1. A cover system for use with a ground surface and a communicating and downwardly extending manhole tube, said cover system comprising:a substantially annular shaped and three dimensional frame, encased within the pavement slab and such that a top edge extending surface of said frame lies substanti

1. A cover system for use with a ground surface and a communicating and downwardly extending manhole tube, said cover system comprising:a substantially annular shaped and three dimensional frame, encased within the pavement slab and such that a top edge extending surface of said frame lies substantially flush with a corresponding top edge surface of the slab, said frame further including an inwardly facing, annular extending and recessed ledge in communication with the manhole tube;a cover seatingly engaged and supported upon said recessed ledge, such that an upper edge surface of said cover is substantially flush with said top edge extending surface of said frame; andat least one externally threaded locking fastener arrayed at an angle relative to a perpendicular axis extending through said cover and said frame, said fastener exhibiting a flattened and extending shaft end inserting within at least one corresponding angular recess established between said frame and said cover and displaceable between an extended and locking position, whereby said shaft end is in abutting contact with an opposing side wall location of said frame and so that said cover is rigidly secured to said frame and an unlocked position, in which said abutting shaft end of said fastener is axially retracted and said cover is removable from said frame. 2. The cover system as described in claim 1, said angular recess further comprising an interiorly threaded recess defined, in a radially inwardly directed fashion, within said frame and receiving a threaded bolt. 3. The cover system as described in claim 2, said cover further comprising a perimeter extending and outwardly facing recess configuration for receiving said threaded bolt in said locking position. 4. The cover system as described in claim 1, said angular recess further comprising an interiorly threaded recess defined, in a radially outwardly directed fashion, within said cover and receiving a threaded bolt. 5. The cover system as described in claim 1, said cover further comprising at least one vertically extending recess proximate a perimeter extending location of said cover and in communication with a horizontal surface associated with said recessed ledge, a fastener seating within said vertical recess and which is downwardly actuated to break a seal established between said cover and said recessed ledge. 6. The cover system as described in claim 5, said vertical recess further comprising a counter sunk and interiorly threaded aperture for receiving a threaded bolt. 7. The cover system as described in claim 1, further comprising a pick hole extending through said cover at an angle relative to said perpendicular axis. 8. The cover system as described in claim 1, said cover exhibiting an upwardly/centrally extending slope along an upper surface thereof. 9. The cover system as described in claim 1, further comprising a plurality of raised projections defined at spaced apart locations along an upper surface of said cover. 10. The cover system as described in claim 1, further comprising a pair of elongated, downwardly projecting and parallel spaced skids associated with a lower edge surface of said cover. 11. The cover system as described in claim 1, said frame exhibiting an outwardly tapered configuration. 12. The cover system as described in claim 11, further comprising a volume of concrete poured within an inner annular band established by said frame and coplanar with the manhole tube. 13. The cover system as described in claim 1, said frame further comprising an intermediate ring, within which said recessed ledge is configured and upon which said cover is seatably engaged. 14. A cover system for use with a pavement slab and a communicating and downwardly extending manhole tube, said cover system comprising:a substantially annular shaped and three dimensional frame, encased within the pavement slab and in communication with the manhole tube such that a top edge extending surface of said frame lies s ubstantially flush with a corresponding top edge surface of the slab, said frame further including an inwardly facing, annular extending and recessed ledge;an intermediate ring supported upon said annular and recessed ledge, said ring in turn defining a recessed annular rim;a cover seatingly engaged and supported upon said recessed annular rim, such that an upper edge surface of said cover is substantially flush with said top edge extending surface of said ring and said frame; andat least one externally threaded locking fastener arrayed at an angle relative to a perpendicular axis extending through said cover and said ring, said fastener exhibiting a flattened and extending shaft end inserting within at least one corresponding angular recess established between said ring and said cover and displaceable between an extended and locking position, whereby said shaft end is in abutting contact with an opposing side wall location of said frame and so that said cover is rigidly secured to said ring and an unlocked position, in which said abutting shaft end of said fastener is axially retracted and said cover is removable from said ring. 15. The cover system as described in claim 14, said angular recess further comprising an interiorly threaded recess defined in an inwardly and downwardly directed fashion within said ring, a threaded bolt being received within said threaded recess and in contact with a selected peripheral location of said cover. 16. A manhole cover for use with a substantially annular shaped and three dimensional frame encased within a pavement slab and a communicating and downwardly extending manhole tube, said cover comprising:a substantially disk shaped body, defining an outer peripheral rim, and which is seatably received upon a corresponding inner annular rim defined by the frame;a pick hole formed through said manhole cover at a selected and intermediate location of said body, said pick hole being formed at an angle relative to a perpendicular axis extending through said cover and the frame; andat least one radially outwardly and downwardly angled recess formed in said cover, in communication with said outer peripheral rim and the inner annular rim of the frame, an externally threaded locking fastener exhibiting a flattened and extending shaft end inserting within said angled recess and being axially displaceable between an extended and locking position, whereby said shaft end is in abutting contact with an opposing side wall location of the frame and so that said cover is rigidly secured to said frame, and an unlocked position in which said abutting shaft end of said fastener is axially retracted and said cover is removable from said frame. 17. The manhole cover as described in claim 16, said angular recess further comprising an interiorly threaded recess defined in said cover and for receiving a threaded bolt. 18. The manhole cover as described in claim 17, further comprising a plurality of interiorly threaded recesses defined in circumferentially spaced apart locations around said peripheral rim of said cover. 19. A cover system for use with a ground surface and a communicating and downwardly extending manhole tube, said cover system comprising:a substantially annular shaped and three dimensional frame, encased within the pavement slab and such that a top edge extending surface of said frame lies substantially flush with a corresponding top edge surface of the slab, said frame further including an inwardly facing, annular extending and recessed ledge in communication with the manhole tube;a cover seatingly engaged and supported upon said recessed ledge, such that an upper edge surface of said cover is substantially flush with said top edge extending surface of said frame, said cover further comprising at least one vertically extending recess proximate a perimeter extending location of said cover and in communication with a horizontal surface associated with said recessed ledge, a fastener seating within said vertical recess and which is downwardly actuated to break a seal established between said cover and said recessed ledge; andat least one locking fastener arrayed at an angle relative to a perpendicular axis extending through said cover and said frame, said fastener inserting within at least one corresponding angular recess established between said frame and said cover and displaceable between a locking position, in which said cover is rigidly secured to said frame and an unlocked position, in which said cover is removable from said frame. 20. A cover system for use with a ground surface and a communicating and downwardly extending manhole tube, said cover system comprising:a substantially annular shaped and three dimensional frame, encased within the pavement slab and such that a top edge extending surface of said frame lies substantially flush with a corresponding top edge surface of the slab, an exterior facing surface of said frame defining an outward taper between said top edge and a bottom edge and in order to dissipate externally applied forces of expansion in a direction generally parallel to said tapered outer surface, said frame further including an inwardly facing, annular extending and recessed ledge in communication with the manhole tube;a cover seatingly engaged and supported upon said recessed ledge, such that an upper edge surface of said cover is substantially flush with said top edge extending surface of said frame; andat least one locking fastener arrayed at an angle relative to a perpendicular axis extending through said cover and said frame, said fastener inserting within at least one corresponding angular recess established between said frame and said cover and displaceable between a locking position, in which said cover is rigidly secured to said frame and an unlocked position, in which said cover, is removable from said frame.