Abstract: A method for slicing workpiece reusing a wire used for previous slicing of a workpiece to slice a subsequent workpiece by which the workpiece is pressed against a wire row and sliced, the wire row being formed of the wire spirally wound between a plurality of wire guides and travels in an axial-direction, where wire tension at the time of slicing the workpiece is set to a value in the range of 87 to 95% of wire tension in the previous slicing of the workpiece, a new wire supply amount at the time of slicing the workpiece is set to a value in the range of 125% or more of a new wire supply amount in the previous slicing of the workpiece, and the wire is reused to slice the subsequent workpiece.

Abstract: A tool, in particular a wood chisel, includes a first profiled part (100; 1), a second profiled part (103; 10, 14) and a removable blade (106; 20). The second profiled part (103; 10, 14) is pushed into the first profiled part such that the removable blade can be inserted between the first and second profiled parts (100; 1; 103; 10, 14) and be held therein by friction.

Abstract: The invention relates to a hand-held demolition tool (1) comprising a cylinder (2), a rear handle (6) and a flexible coupling (4) for the flexible connection of the cylinder (2) and the rear handle (6). According to the invention, the flexibility of the coupling (4) is arranged such that it allows flexibility only in the property pivot action between the cylinder (2) and the rear handle (6) around a rigid theoretical axis (9).

Abstract: A chisel includes an elongate shank portion composed of a first steel, and a working end portion composed of a second steel that is different than the first steel. The working end portion is joined to the shank and configured to chisel a workpiece. The joined shank portion and working end portion has been heat treated to cause the first steel of the shank portion to adopt a first microstructure comprising bainite, the second steel of the working end portion to adopt a second microstructure comprising martensite, and the working end portion to have a greater hardness than the shank portion.

Abstract: A breaking apparatus (1) including a movable mass (3) for impacting on a striker pin (4), a housing (2) and a striker pin (4) configured to partially protrude through the housing (2), the apparatus (1) characterized in that the striker pin (4) is configured to be beatable in a plurality of retaining locations relative to the housing (2).

Abstract: The invention relates to a flat chisel, in particular an insertion chisel for power-driven drill and chisel hammers for working stone, having a chisel head which has a main tip disposed transversely to a chisel longitudinal axis, a front and rear striking surface, and at least one side face connecting the striking faces. In this case, a side face designed as a side lip is provided.

Abstract: A point chisel for use with a power tool includes an elongate stem (1) having, at its power tool side a shank (2) for securing the chisel in the power tool and, at its workpiece side, a useful region (3) having its outer diameter (H) tapering toward its workpiece end and having a cross-section (5) formed as a concave polygon by a plurality of axial grooves (4) extending radially toward a core diameter (K) that likewise tapers toward the workpiece side end of the useful region (3).

Abstract: A method of cutting a rare-earth alloy with a wire 20, on which abrasive grains are fixed with a resin layer provided on the outer surface of a core wire, includes the steps of: providing a wire, of which the surface is coated with a lubricant including a glycol, by reeling the wire up in a pair of reel bobbins 40a and 40b; reeling the wire off one of the reel bobbins and letting the wire travel on a plurality of rollers 10a, 10b and 10c; and cutting the rare-earth alloy with the traveling wire while a portion of the rare-earth alloy being cut with the wire is supplied with a first coolant which is mainly composed of water. As a result, the life of a wire can be extended when a rare-earth alloy is cut with a wire saw machine using a coolant which is mainly composed of water.

Abstract: A block splitting tool having a splitting blade that is formed by edges of a plurality of smaller splitter segments. The splitter segments are arranged in a side-by-side relation such that the edges form a substantially continuous blade that is generally corrugated or jagged. The splitter segments may be operatively connected to a suitable support that, in turn, is attached to a block splitting machine. When the splitting blade of the tool engages and splits a block, the edges of the splitter segments form a plurality of fracture zones that are angled with respect to each other, which results in roughened facings on the newly cleaved smaller blocks. In a preferred embodiment, the splitter segments are removably attached to a support plate, so that they may be repositioned, replaced, and/or repaired.

Abstract: A point chisel for use with a power tool includes an elongate stem (1) having, at its power tool side a shank (2) for securing the chisel in the power tool and, at its workpiece side, a useful region (3) having its outer diameter (H) tapering toward its workpiece end and having a cross-section (5) formed as a concave polygon by a plurality of axial grooves (4) extending radially toward a core diameter (K) that likewise tapers toward the workpiece side end of the useful region (3).

Abstract: A stone hammer having a weighted head has detachably rotatable and reversible faceplates defining striking edges on opposite ends of the head. The edges of the faceplates define cutting edges for trimming stone and the like. As a striking edge becomes worn, another striking edge can be selected by repositioning the faceplate. A striking edge may be selected by rotating a faceplate, individually reversing a faceplate, replacing a faceplate, striking with an opposing end or different edge of the hammer, or any combination thereof. In one embodiment, the faceplates are attached by a symmetrical pattern of bolts disposed in the faceplates. A worn striking edge is replaced by unbolting the faceplate and either flipping the faceplate over, or replacing the worn faceplate with a new faceplate having fresh, sharp edges.

Abstract: An attachment for a percussive tool comprises a plurality of parallel rows of teeth (10) formed along the edges of planar chisel blades (9) arranged to form a shape having rotational symmetry. The attachment is connected to a percussive tool and placed in contact with a wall (12). The tool causes percussive action of the attachment such that the chisel blades (9) form a plurality of parallel grooves (13) and ridges in the wall. The tool and attachment are then rotated through an angle and placed in contact with the wall (12) in a position overlaying the plurality of parallel grooves (13). This breaks up the ridges forming a hole (15) of a substantially uniform depth. The attachment is used to produce square holes suitable for installing wall boxes for light switches or power points.

Abstract: The invention relates to a flat chisel (2), in particular an insertion chisel for power-driven rotary hammers for working stone, having a chisel head (3) which has a main lip (7) disposed transversely to a chisel longitudinal axis (x), a front and a rear striking face (10, 11), and at least one side face (12, 13) connecting the striking face (10, 11). In this case, an approximately concave and/or convex and/or bent and/or undulating profile of at least one lip (7, 14, 15) is provided.

Abstract: A rock splitter of oil hydraulic piston type includes a housing having a plurality of cylinder chambers on the upper portion and first and second paths communicated with the cylinder chambers for supplying and discharging oil; a piston in the cylinder chamber of the housing; and a cap capable of a vertical movement, the cap being connected to the upper surface of the housing in such a manner that the inner surface thereof is in contact with the upper surface of the housing. The cap moves vertically depending on the movement of the piston. The rock splitter further comprises: a cylinder detachably mounted inside the cylinder chamber of the housing; a collapsible member having a locking member detachably mounted in the cylinder chamber, a plurality of extension members capable of a vertical extension; and an elastic member supporting the lower end of a central extension member. The entire front surface area of the cap touches the rock to maximize the power applied to the rock.

Abstract: Arrangements are taught for decoratively engraving a surface, such as hardened concrete or stone, particularly by engraving stencil-defined swaths into the surface with a tool of the type commonly called a needle scaler. The arrangements include methods of covering portions of the surface with a stencil made of material capable of withstanding a chisel blow, and then engraving exposed swaths by repeated chisel blows from one or more chisels having a restricted stroke. In some cases non-contiguous portions of a stencil are interconnected by bridge-line connectors selected to allow free access to the entire swath by a needle scaler or other chisel driving apparatus. In other cases a space-frame is placed atop a stencil and used to support discrete non-contiguous island portions of the stencil.

Abstract: A splitter blade assembly adapted to form split faces on concrete masonry units including: a plurality of blade sections arranged to bound an opening; and a stop positioned within the opening so as to prevent debris from lodging in the opening during a splitting operation.

Abstract: A chisel and a method of manufacturing a durable chisel. An axial hole is formed in a chisel so that the hole is open at the chisel tip. Non-metallic powder is then supplied into the axial hole. A core member made of cemented carbide or other material harder than the chisel body is then press-fitted into the axial hole. By inserting the core member into the hole, the non-metallic powder flows so as to fill up any space between the rear end face of the core member and the closed end of the axial hole.

Abstract: The disclosure is directed to a method of masonary cutting and to the structure of a novel tool. The tool has twin outwardly splayed and flared chisel like blades which join the handle at a recess groove for waste ejection. The blades are beveled only on their upper edges and are driven forward by hammering on the remove handle end. The method comprises attacking a flat masonary surface at an angle greater than 5 degrees (preferably at 13 degrees) with twin divergent cutting edges beveled only on the upper surfaces and having a flat lower surface. Material is imploded between the blades and ejected at the recess groove without dust formation.

Abstract: A scabbler apparatus having a conventional reciprocated rod is provided with a bit secured to a shank member. A compression spring is adapted to urge the shank and rod upwardly while motive means is provided to drive the rod, shank and bit toward the surface of concrete, rock and the like and against the bias of the spring. A protective retainer and an exclusionary means is provided. This exclusionary means may be a boot, a wiper ring and with or without a one-way valve means. The compression spring is retained at its lower end by a support shelf, usually an inwardly formed flange of the retainer. A washer or ring engages or is carried by the shank of the bit and engages the top end of the spring to urge the shank, the attached bit and the reciprocated rod upwardly.

Abstract: Chisel for an impact apparatus comprising a stem with connecting means, in line with said stem a blade-shaped, longitudinal chisel part, the free end of which is provided with a plurality of teeth which are thicker than the blade-shaped part. Extending from between the teeth either straight or undulated grooves are arranged in the blade-shaped part.