Road structure – process – or apparatus – Traffic director
Patent
1991-01-22
1992-10-27
Schwartz, Larry I.
Road structure, process, or apparatus
Traffic director
408145, E01F 904
Patent
active
051583933
ABSTRACT:
Disclosed are methods for applying durable markings to wearing surfaces, such as concrete factory floors, roadways, terrazzo or ceramic tile floors, or for imparting particular floor surface qualities, such as providing a non-skid surface. A diamond surface drill bit rotating at, for example, 2500 to 5000 rpm is employed to form dry recesses in the surface, which recess is immediately receptive to adhesive for attaching a pre-molded insert, or to an insert formed in situ, such as an insert of an acrylic polymer. The disclosed surface drill bit has a cutting end with two general types of diamond-impregnated cutting element segments attached. Attached around the periphery of the cutting end are peripheral gauge cutting element segments of arcuate configuration spaced from each other. Also attached to the cutting end are a plurality of inside cutting elements arranged in a generally radially extending pattern, starting from within the spaces betwen the peripheral gauge cutting element segments, and extending radially inwardly. The inside cutting element segments serve the dual purposes of cutting away areas of the surface within the peripheral extent, and serving as air vanes to promote airflow for cooling and carrying away debris. To maintain the lateral position of the drill bit during operation, either a small core drill centered in the cutting end or a pin engaging a pre-drilled hole in the masonry surface is provided. The drill bit may be assembled in various ways to suit a variety of specific on-site conditions.
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Schultz Robert
Schwartz Larry I.
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