Method for removing trip hazards in concrete sidewalks
2 Assignments
0 Petitions
Accused Products
Abstract
An apparatus for cutting a chamfer on an upper edge of a concrete slab includes a hub designed for installation on the threaded output spindle of an angle grinder, and a specially-modified diamond-grit-edged rotary blade which mounts on the hub. For a preferred embodiment of the hub, an attachment collar is unitary and concentric with both a blade mounting flange and a blade centering shoulder on the flange. The attachment collar has at least one pair of flattened parallel sides for receiving a wrench used to tighten the hub on the output spindle. The side of the blade mounting flange opposite the collar is equipped with multiple countersunk threaded holes, by means of which the blade may be attached with countersinking screws. The rotary blade is equipped with a central positioning aperture sized to fit closely over the blade centering shoulder. The blade is equipped with countersunk holes which align with those on the blade mounting flange. When the blade is secured to the hub with the screws, the head of each of the screws is flush with the surface of the blade. As the blade rotates and cuts into concrete, the entire lower surface of the blade may remain in contact with the lower cut surface. Because the hub will contact the concrete above the cut, that concrete must be periodically broken and removed to provide adequate clearance for the hub as the cut is continued.
26 Citations
40 Claims
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1-20. -20. (canceled)
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21. A method for cutting a chamfer on an edge of a concrete slab, the method comprising the following sequence of steps:
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(a) providing a generally circular, rotatable concrete saw blade that is coupled to a right-angle grinder motor with a blade-mounting hub having no blade attachment hardware projecting below a lower major surface of the blade;
(b) making an initial planar cut at a desired angle beginning a distance from said edge, the initial cut creating an initial cantilevered ledge above the initial cut;
(c) if the initial cantilevered ledge is severed from the slab by cutting action of the blade before the hub is proximate an edge of the initial cantilevered ledge, then the chamfer is complete;
but if the initial cantilevered ledge is not severed from the slab by cutting action of the blade before the hub is proximate an edge of the initial cantilevered ledge, then proceeding to the next step;
(d) fracturing and removing the initial cantilevered ledge from the slab;
(e) making a subsequent planar cut beginning where the previous (initial, or otherwise) planar cut ended, all the while maintaining the desired angle, the subsequent planar cut creating a subsequent cantilevered ledge above the subsequent planar cut;
(f) if the subsequent cantilevered ledge is severed from the slab by cutting action of the blade before the hub is proximate an edge of the initial cantilevered ledge, then the chamfer is complete;
but if the subsequent cantilevered ledge is not severed from the slab by cutting action of the blade before the hub is proximate an edge of the subsequent cantilevered ledge, then proceeding to the next step; and
(g) fracturing and removing the subsequent cantilevered ledge from the slab and repeating steps (e) through (f). - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for cutting a chamfer along an upper abutting edge of a first of two abutting concrete slabs, said abutting edge being elevated above an upper surface of said second concrete slab, the method comprising the following sequence of steps:
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(a) providing a generally circular, rotatable concrete saw blade that is coupled to a right-angle grinder motor with a blade-mounting hub having no blade attachment hardware projecting below a lower major surface of the blade;
(b) making an initial planar cut at a desired angle beginning a distance from said upper abutting edge, said desired angle being selected so that a projection of a bottom surface of said initial planar cut intersects an upper abutting edge of the second concrete slab, the initial planar cut creating an initial cantilevered ledge above the initial planar cut;
(c) if the initial cantilevered ledge is severed from the slab by cutting action of the blade before the hub is proximate an edge of the initial cantilevered ledge, then the chamfer is complete;
but if the initial cantilevered ledge formed by the initial planar cut is not severed from the slab by cutting action of the blade before the hub is proximate an edge of the initial cantilevered ledge, then proceeding to the next step;
(d) fracturing and removing the initial cantilevered ledge from the slab;
(e) making a subsequent planar cut beginning where the previous (initial, or otherwise) planar cut ended, all the while maintaining the desired angle, the subsequent planar cut creating a subsequent cantilevered ledge above the subsequent planar cut;
(f) if the subsequent cantilevered ledge is severed from the slab by cutting action of the blade before the hub is proximate an edge of the initial cantilevered ledge, then the chamfer is complete;
but if the subsequent cantilevered ledge is not severed from the slab by cutting action of the blade before the hub is proximate an edge of the subsequent cantilevered ledge, then proceeding to the next step; and
(g) fracturing and removing the subsequent cantilevered ledge from the slab and repeating steps (e) through (f). - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification