Mounting adapter for concrete surface processing tool

1. A mounting assembly for rotatably mounting a tool holding means comprising a tool holder body having first and second surfaces on at least one motor driven rotatable arm of a surface processing apparatus, a surface processing tool mounted on said first surface and an aperture extending through said first and second surfaces, said surface processing tool having an axis substantially parallel to the axis of rotation of said motor driven arm, said tool axis passing through said aperture of said tool holder body, whereby said surface processing tool can spin freely about its axis as said arm is rotatably driven by said motor, said mounting assembly comprising:

elongate unitary shank means including an elongate smooth surfaced, generally cylindrical shank portion intermediate the ends of said shank means, said shank means adapted for positioning within said aperture with one end projecting through said second surface of said tool holder body;

bearing means supported by said second surface of said tool body, said bearing means having a bore surrounding, in closely adjacent relationship, said smooth surfaced portion of said shank means;

said bearing means being rotatable relative to said shank means for rotatably mounting said surface processing tool, whereby said surface processing tool can spin freely about its axis, said bearing means comprising the only bearing means on which said surface processing tool rotates; and

elongate mounting means adapted for attachment to said arm, said one end of said elongate shank means including means for non-rotatable attachment to said mounting means.

2. A mounting assembly, as claimed in claim 1 , wherein said elongate shank means includes a head at one end of said smooth surfaced portion and a threaded end portion at the opposite end of said smooth surfaced portion.

3. A mounting assembly, as claimed in claim 2 , wherein said elongate mounting means includes a threaded aperture for receiving said threaded end portion of said shank means within said threaded aperture and said threaded aperture includes a counterbore for receiving the end portion of said smooth surfaced portion which is adjacent said threaded end portion.

4. A mounting assembly, as claimed in claim 3 , wherein said elongate mounting means includes at least two additional apertures for receiving connecting means connecting said elongate mounting means to said arm.

5. A mounting assembly, as claimed in claim 2 , wherein said bearing means includes first and second relatively rotatable, concentric hubs, said first hub being supported by said second surface of said tool holder body such that said bearing means is concentric with said aperture therein.

6. A mounting assembly, as claimed in claim 5 , wherein said first hub has a first central bore, said second hub has a second central bore concentric with said first central bore and is mounted within said first central bore.

7. A mounting assembly, as claimed in claim 6 , wherein said elongate shank means extends through said second central bore with the threaded end portion of said shank and the end portion of said smooth surfaced portion which is adjacent said threaded end portion projecting from said second central bore.

8. A mounting assembly, as claimed in claim 7 , wherein said elongate mounting means includes a threaded aperture for receiving said threaded end portion of said shank means within said threaded aperture and said threaded aperture includes a counterbore for receiving the end portion of said smooth surfaced portion which is adjacent said threaded end portion.

9. A mounting assembly, as claimed in claim 7 , wherein said smooth surfaced portion has a smaller diameter than said shank head for defining a shoulder therebetween, said shoulder abutting said second hub when said shank is fully threaded within said mounting means.

10. A mounting assembly, as claimed in claim 7 , wherein the diameter of the shank head is smaller than the diameter of the aperture.

11. A mounting assembly, as claimed in claim 1 , wherein said elongate mounting means is an elongate bar.

12. A mounting assembly, as claimed in claim 1 , wherein said surface processing tool is selected from scrubbing tools, buffing tools, brushing tools, grinding tools and polishing tools.

13. A mounting assembly, as claimed in claim 1 , wherein said surface processing tool comprises a circular brush in the form of a ring having a hollow center.

14. A mounting assembly, as claimed in claim 2 , wherein said bearing means comprises a hollow cylindrical, elongate sleeve having an outside diameter smaller than the diameter of said aperture in said tool holding means and means on said sleeve for maintaining said sleeve within said aperture.

15. A mounting assembly, as claimed in claim 14 , wherein said means on said sleeve comprises a circular flange extending radially outwardly from the periphery of one end of said sleeve.

16. A mounting assembly, as claimed in claim 15 , wherein said elongate shank means extends through said sleeve with the threaded end portion of said shank and the end portion of said smooth surfaced portion which is adjacent said threaded end portion projecting from said sleeve.

17. A mounting assembly, as claimed in claim 16 , wherein said elongate mounting means includes a threaded aperture for receiving said threaded end portion of said shank means within said threaded aperture and said threaded aperture includes a counterbore for receiving the end portion of said smooth surfaced portion which is adjacent said threaded end portion.

18. A mounting assembly, as claimed in claim 17 , wherein the length of said shank means between the underside of said shank head and the surface of said mounting means adjacent said second surface of said tool holding means is slightly longer than the length of said sleeve to allow said surface processing tool to freely spin about said shank means.