Abstract: A work tool for a hammer is disclosed. The work tool may include a first terminal end having a planar surface, and a second terminal end opposite the first terminal end and including a tool tip. The work tool may further include a shank between the first and second terminal ends and including a proximal first shank portion and a distal second shank portion coaxially aligned. The work tool may further include a collar between the first and second shank portions. The collar may include a rectangular portion forming lateral sides of the collar, each of the lateral sides including a planar surface that extends in a direction along an axis of the work tool. The collar may further include a flange having a diameter greater than a diameter of the shank and greater than a length of a lateral side of the rectangular portion.

Abstract: The present invention provides a long-bladed bolster 1, comprising a substantially planar cutting body 2 having one edge formed as a blade 3 of sufficient length so that the blade 3 is arranged in use to be positioned substantially centrally on a concrete masonry unit (CMU) to enable the block to be divided without the bolster 1 requiring repositioning, the bolster having a striking body on a second long edge of the cutting body opposite to the cutting blade configured to receive repeated blows from a striking implement in use and to transmit these through the cutting body to the blade and the bolster having an integral handle that extends from the cutting body and/or striking body of the bolster substantially centrally along the length of the cutting body 2 and substantially orthogonally to the plane thereof.

Abstract: A concrete stone texturing machine, method and a stone having an irregular rough surface resembling a real stone face is described. The machine conveys concrete stones having opposed flat surfaces to a pitching station having at least one pair of opposed pitching blade assembles aligned in a common plane on a respective side of the pitching station. The pitching blade assemblies are displaced towards and away from one another a predetermined distance. Each assembly has a plurality of pitching blades secured in side-by-side aligned relationship. Each of the pitching blades has a forward projecting cutting edge and a securing body portion. A first group of the pitching blades has their cutting edges aligned along a first straight cutting axis which is offset from the cutting edges of the second group of pitching blades aligned along a second straight cutting axis. The cutting axes are parallel to one another.

Abstract: The machine includes a reciprocating piston/hammer (10) assembly, which is constrained against rotation in the cylinder (8). This allows the cutting bit to apply concentrated action along a line, and thus is useful for cutting grooves. The cutting bars (40) are arranged in sequence to enter progressively deeper into the groove. Many bits are arranged side by side, for cutting parallel grooves simultaneously.

Abstract: A stoneworking or cutting device for texturing the surface of stones, in particular, concrete slabs, has a tool holder in a swing frame with a number of stoneworking or cutting tools, whereby each tool is activated individually. To produce the striking force, a number of flyweights are mounted on the swing frame so that they can rotate, whereby the swing frame itself is mounted so that its height can be adjusted in a horizontally movable base carriage. Striking pins corresponding to the individual tools in the tool holder are made to oscillate by the flyweights to activate the tools which work the stone.

Abstract: A surface-chiseling machine for refractory, concrete or other materials is disclosed, which includes a piston having at its one end a step portion and on a side periphery at its other end a through-hole, and a cylinder forming a first air chamber on a closed side of the step portion of the piston, forming an exhaust channel communicated with the through-hole of the piston and having an air hole for feeding a compressed air to the first air chamber. The cylinder at its rear end is closed with a back head for forming therein a second air chamber, while at its front end is closed with a front head which is provided with a plurality of chisel-inserting holes, into which are inserted chisels with their rear ends being contactable directly with a front face of the piston for providing a striking action on the chisels.

Abstract: A scabbler machine for breaking concrete etc. having a number of scabbling bits made up of a shank for connection to the reciprocal piston of the scabbler machine and a head provided with tungsten carbide, or like, cutting members. To ensure complete scabbling of the surface to be treated the head of the scabbling bits have portions which overlie portions of other bits so that the bits overlap one another in the direction of movement of the scabbler machine over the surface to be treated.

Abstract: A pneumatically-powered hammer for giving concrete surfaces a rough texture and an efficient method for using the hammer. The hammer comprises a pneumatic riveting hammer with a uniquely short and blunt-ended accessory secured thereto. The pneumatic riveting hammer uses, for example, a 11/2 inch piston and is activated by increased air pressure thus assuring a rapid, forceful stroke. Operation of the hammer includes holding the blunt end of the accessory securely against the concrete surface to be textured while moving the hammer horizontally across the surface in short vertical strokes during the entire time the hammer is activated. Excessive gouging and corner chipping caused by the hammer are repaired by partially filling such gouges or chips with wet, fast-setting concrete and securing leavings broken away by the hammering process to the wet concrete such that the repaired gouges and chips match the remainder of the surface in color and texture.

Abstract: Disclosed is a method and machine for digging a ditch for use in, for example, duct disposition therein. In the floors and walls of a concrete structure, for example, three preparatory ditches or channels are dug by means of rotary blades. By inserting a breaking rod into a central one of the channels and causing it to vibrate substantially perpendicular to the channel to strike partition walls between the channels, the partition walls are readily broken or fractured, at which time the outermost channels serve as escapement spaces for permitting reception therein of the partition walls about to be bent or broken. Thereafter, the resultant partition wall pieces are removed, whereby a desired form of ditch is obtained. The partition wall fracturing steps may be carried out simultaneously with the channel digging or cutting step, or may alternatively be carried out independently after completion of the latter step.

Abstract: A device and method for etching designs on glass or like surfaces by a sand erosion process. The device has a housing with a vibratory motor mounted therein. The motor drives a sharp or tapered carbide engraving blade or tip through a reciprocating axial motion at a high rate of speed. The blade can be used to engrave or chisel outlines or silhouettes of designs on a glass surface. The device is also provided with a sand erosion adaptor which can be removably fixed on the blade providing a more blunt working end. Sand is delivered from a sand supply in the housing through the sand erosion adaptor and onto the glass surface so that the reciprocal motion of the adaptor grinds or pounds sand against the glass surface to produce an etching effect on the surface. Vibration of the motor means helps the delivery of sand through the head by agitating the sand for freer gravity flow.

Abstract: A cutting tool is especially adapted for use with a power driven hammer. The power driven hammer is held in one hand and the shank of the tool is inserted into a guide on the hammer. Preferably, the power driven hammer is adapted to move the tool through a very short distance at a very high frequency so that each individual movement transmitting force on the tool will be short. The tool body has cutting teeth for cutting into the workpiece under action of the tool. The depth and speed of cut of the tool can be varied in a number of ways. In one embodiment, the teeth have a plurality of laterally flat cutting edges disposed in a longitudinally curved array, and the angle which the tool makes with the workpiece determines the depth and speed of the cutting. In a second embodiment, the teeth are disposed in a substantially flat plane, and a pivot is provided to transmit force from the anvil to the tool through the shank therebetween.

Abstract: Blocks are defeathered by a multiplicity of simultaneous blows from below repeated on a line transversely of the path of travel in conveying dried blocks away from drying racks at a block making machine. The blows are delivered by a series of washers hung on a rod and struck upwardly by a squared, powered shaft rotating therebelow.

Abstract: A pneumatically-powered hammer for giving concrete surfaces a rough texture and an efficient method for using the hammer. The hammer comprises a pneumatic riveting hammer with a uniquely short and blunt-ended accessory secured thereto. The pneumatic riveting hammer uses, for example, a 11/2 inch piston and is activated by increased air pressure thus assuring a rapid, forceful stroke. Operation of the hammer includes holding the blunt end of the accessory securely against the concrete surface to be textured while moving the hammer horizontally across the surface in short vertical strokes during the entire time the hammer is activated. Excessive gouging and corner chipping caused by the hammer are repaired by partially filling such gouges or chips with wet, fast-setting concrete and securing leavings broken away by the hammering process to the wet concrete such that the repaired gouges and chips match the remainder of the surface in color and texture.