Abstract: A concrete saw is disclosed having a rigid metal frame, a hydraulic drive system, a water-cooled hub, and an axially rotatable trigger assembly comprising a 12 volt switch. The saw may include a hydraulic pump operable to supply pressurized hydraulic fluid to the drive system. In some embodiments, the saw may includes a flow sharing valve fluidly coupled to the hydraulic drive system to distribute the pressurized hydraulic fluid from the a hydraulic pump in a portable power pack. A method of removing trip hazards with the saw is also disclosed.

Abstract: The present method of grinding side ridge line portion and a side surface of concrete blocks having the flowing steps: providing a rotating shaft of the grinding machine to be rotationally supported by lower ends of two vertical bars facing each other in the direction in which a conveyor is advanced and suspended from a frame above the conveyor and positioning an axis of the rotating shaft to be laterally and above the conveyor, moving the concrete blocks to a position where it is ground by the conveyor and then positioning the concrete blocks to make side ridge line portions on the bottom surfaces thereof protrude from the conveyor, and grinding the side ridge line portions and/or side surfaces on the upper or the bottom surface of the concrete block by lowering the grinding machine suspended from above the concrete block, the side ridge line portions and/or the side surfaces of the concrete blocks are ground by abutting the grinding machine against the surface of concrete blocks, while at the same time rota

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.

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 having countersunk attachment screw holes 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 blade, which is equipped with both countersunk attachment holes and a central positioning aperture sized to fit closely over the blade centering shoulder, is attachable with countersinking screws to the mounting flange so that the head of each screw is flush with the surface of the blade.

Abstract: A method for cutting a chamfer on an edge of a concrete slab, comprising the steps of: 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; making an initial planar cut at a desired angle beginning a distance from the edge, thereby creating an initial cantilevered ledge above the initial cut; if the initial cantilevered ledge is not severed from the slab by a cutting action of the blade before the hub is proximate an edge of the initial cantilevered ledge, then fracturing and removing the initial cantilevered ledge from the slab; and making at least one subsequent planar cut continuous with the initial cut and any necessary fracturings and removals of subsequent cantilevered ledges until the chamfer is complete.

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 having countersunk attachment screw holes 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 blade, which is equipped with both countersunk attachment holes and a central positioning aperture sized to fit closely over the blade centering shoulder, is attachable with countersinking screws to the mounting flange so that the head of each screw is flush with the surface of the blade.

Abstract: A casted concrete block surface-roughing machine having an in-line conveyor displaceable over a stationary horizontal support surface for slidingly supporting a lower surface of concrete blocks displaced thereon by the conveyor. At least two pairs of spaced-apart vertically supported conveyor belts are disposed to engage opposed side faces of the concrete blocks to displace them along the stationary horizontal support surface. One of the pairs of the conveyor belts engages the opposed side faces in a lower surface section thereof to expose an upper surface section thereof to be abraded by respective surface abrading devices. The other of the pairs of conveyor belts engage the opposed side faces in the upper surface section of the concrete block to expose the lower surface section thereof to be abraded by further respective surfaces abrading devices.

Abstract: 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 having countersunk blade-attachment screw holes 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 blade which is equipped with both countersunk attachment holes and a central positioning aperture sized to fit closely over the blade centering shoulder, is attachable with countersinking screws to the mounting flange so that the head of each screw is flush with the surface of the blade.

Abstract: An automated stone burning apparatus, which precisely adjusts the burning operation and improves the throughput. The apparatus consists of a torch assembly that is mounted in proximity to a stone slab lying upon a roller bed. The torch assembly is movable both transversely and laterally (i.e., in orthogonal directions with respect to the stone slab). An electrical control system adjusts the speed and location of the torch during the burn process.

Abstract: A device for cutting integrated circuit package boards is disclosed. The device includes a circular saw blade. A plurality of slots are cut in the circumference of the circular saw blade, at least some of the plurality of slots having a depth of at least approximately 2 mm. The blade may have a plurality of first and second slots of different depths cut in the circumference of the saw blade arranged in an alternating pattern.

Abstract: A stone polishing head for use on a conventional automatic polishing machine which is simple, but has the weight and strength of a prior art polishing head for which the machine was designed. The polishing head is formed of a solid steel barrel having a central bore for coolant flow. On the bottom surface of the barrel a first plate is fixed, and a drive plate is resiliently fixed adjacent to the plate. A tool carrier plate is releasably fixable to the drive plate for rotation with the barrel. The plates are connected by a plurality of connecting pins to maintain the plates parallel to each other.

Abstract: An apparatus which is rugged and simple to use, and which can finish shot-crete to an acceptable flatness and finish is disclosed. The efficient mechanical apparatus eliminates the need for skilled hand finishing of concrete or another slurry sprayed on a wall. Labor costs are dramatically reduced to a fraction of generally accepted hand finishing costs. Finished appearance is much improved. The apparatus comprises: a frame; a shearing means which preferably is a revolving drum, to shear the slurry, slidably mounted on a carriage on the frame; carriage motivating and control means for moving the carriage on the frame; and, frame support means for spacing and positioning the frame adjacent to a side of the wall. A preferred aspect of this invention provides for a frame support means which comprises a track mounted on the wall and a tracking member positioned on a top side portion of the frame.

Abstract: A process for surface treating the surface of petrous materials comprises applying friction to the surface to be treated by means of brush bristles which produce progressive erosion of the surface wherein the erosion is of greater depth in zones of lesser hardness. The process removes parts of lesser consistency from the surface. The process is performed without chemical treatment, sand blasting or the application of fire to texture and may be performed in the presence of water.

Abstract: A quick-ball release blowout preventer apparatus is mounted above a kelly for preventing oil and gas blowouts. A longitudinally bored subassembly is provided with at least one transverse bore therethrough for securably receiving a quick-ball release bolt mechanism. The longitudinal bore of the subassembly is aligned with the bores of the kelly cock and the kelly, thereby providing a fluid flow passage therethrough. An activator mechanism and a spring-loaded plunger mechanism is provided. The activator mechanism activates the spring-loaded plunger which in turn moves the ball valve to allow fluid flow through slots provided in the valve seat.