METHOD FOR REMOVING TRIP HAZARDS IN CONCRETE SIDEWALKS

• US 20070131212A1
• Filed: 12/20/2006
• Published: 06/14/2007
• Est. Priority Date: 05/24/2002
• Status: Active Grant

• Current Assignee: Precision Concrete Cutting Incorporated
• Original Assignee: Precision Concrete Cutting Incorporated
• Inventors: Gardner, M.
• Granted Patent: US 7,402,095 B2
• Time in Patent Office: Days
• US Class Current: 125/13.10
• CPC Class Codes: B23D 45/16 Hand-held sawing devices with circular saw blades
• CPC Class Codes: B24B 23/028 Angle tools
• CPC Class Codes: B24D 5/123 having different cutting segments
• CPC Class Codes: B24D 5/16 Bushings; Mountings
• CPC Class Codes: B27B 5/08 for sawing with the saw blade abutting parallel against a surface of the workpiece
• CPC Class Codes: B27B 5/32 Devices for securing circular saw blades to the saw spindle
• CPC Class Codes: B28D 1/04 with circular or cylindrical saw-blades or saw-discs B28D1/10 takes precedence

Abstract

A method for cutting a chamfer on an edge of a concrete slab, the method comprising the steps of: making a generally planar cut, beginning a distance from the edge, with a generally circular, generally laminar concrete saw blade rotatably powered by a right-angle grinder motor, the generally planar cut being made at a desired angle and creating a cantilevered ledge above the generally planar cut; fracturing and removing at least a portion of the cantilevered ledge from the slab whenever an edge of the cantilevered ledge is proximate the hub; and continuing the generally planar cut until the cantilevered ledge is severed from the slab.

Claims

1-20. -20. (canceled)

21. A method for cutting a chamfer on an edge of a concrete slab, the method comprising the steps of:

making a generally planar cut, beginning a distance from the edge, with a generally circular, generally laminar concrete saw blade rotatably powered by a right-angle grinder motor, the generally planar cut being made at a desired angle and creating a cantilevered ledge above the generally planar cut;

fracturing and removing at least a portion of the cantilevered ledge from the slab whenever an edge of the cantilevered ledge is proximate the hub; and

continuing the generally planar cut until the cantilevered ledge is severed from the slab.

22. The method of claim 21, wherein:

the right-angle grinder motor has an output shaft with a first axis of rotation;

the concrete saw blade is rotatable about a second axis of rotation; and

the concrete saw blade is coupled to the output shaft, with the first and second axes of rotation being coincident.

23. The method of claim 21,wherein the desired angle is less than or equal to about seven degrees from level.

24. The method of claim 21, wherein the blade has a diameter of about 8 inches.

25. The method of claim 21, wherein the planar cut is performed with no water cooling of the blade.

26. The method of claim 21, wherein the concrete saw blade has a peripheral metal matrix edge in which diamond grit is embedded.

27. The method of claim 21, wherein, at least while continuing the continuation of the generally planar cut, a center portion of the blade is superjacent regions of the slab which were cut during the initial planar cut.

28. A method for cutting a chamfer along an upper abutting edge of a first of two abutting concrete slabs, the abutting edge of the first concrete slab being elevated above an upper surface of the second concrete slab, the method comprising the steps of:

making a generally planar cut, beginning a distance from the upper edge of the first concrete slab, with a generally circular, generally laminar concrete saw blade rotatably powered by a right-angle grinder motor, the generally planar cut being made at a desired angle selected so that a projection of a bottom surface of the planar cut intersects an upper abutting edge of the second concrete slab, the generally planar cut creating a cantilevered ledge above the planar cut;

fracturing and removing at least a portion of the cantilevered ledge from the slab whenever an edge of the cantilevered ledge is proximate the hub; and

continuing the generally planar cut until the cantilevered ledge is severed from the slab.

29. The method of claim 28, wherein:

the right-angle grinder motor has an output shaft with a first axis of rotation;

the concrete saw blade is rotatable about a second axis of rotation; and

the concrete saw blade is coupled to the output shaft, with the first and second axes of rotation being coincident.

30. The method of claim 28, wherein the desired angle is less than or equal to about seven degrees from level.

31. The method of claim 28, wherein the blade has a diameter of about 8 inches.

32. The method of claim 28, wherein the planar cut is performed with no water cooling of the blade.

33. The method of claim 28, wherein the concrete saw blade has a peripheral metal matrix edge in which diamond grit is embedded.

34. The method of claim 28, wherein, at least during the making of a subsequent planar cut, a center portion of the blade is superjacent regions of the slab which were cut during the initial planar cut.

35. A method for cutting a chamfer on an edge of a concrete sidewalk slab, the method comprising the steps of:

making a generally planar cut at a desired angle beginning a distance from the edge, the generally planar cut creating a cantilevered ledge above the generally planar cut;

fracturing and removing at least a portion of the cantilevered ledge from the slab whenever an edge of the cantilevered ledge is proximate the hub; and

continuing the generally planar cut until the cantilevered ledge is severed from the slab.

36. The method of claim 35, wherein the desired angle is less than or equal to about seven degrees from level.

37. The method of claim 35, wherein the cut is made with a generally circular, generally laminar concrete saw blade rotatably powered by a right angle grinder motor.

38. The method of claim 37, wherein the planar cut is performed with no water cooling of the blade.

39. The method of claim 37, wherein the concrete saw blade has a peripheral metal matrix edge in which diamond grit is embedded.

40. The method of claim 35, wherein, at least while continuing the continuation of the generally planar cut, a center portion of the blade is superjacent regions of the slab which were cut during the initial planar cut.