The invention provides a block splitter device comprising first lower and second upper opposed block splitter assemblies. The block splitter assemblies have first and second forming edges that extend at least the majority of the distance from a first end to a second end of the block splitter assembly and have first ends disposed near a median split plane and second ends disposed further away from the median split plane than the first ends. Methods of using the block splitter device are described.

A system for building a wall includes a plurality of blocks and a plurality of connectors for aligning the blocks in successive courses. Each block has opposing first and second surfaces bounded by opposing front and rear faces and opposing end faces, the first and second surfaces being profiled with respective first and second rectilinear channels extending parallel to the front and rear faces. Each connector has first and second portions profiled for reception in respective first and second channels, the first portion being profiled to slide but not rotate in the first channel, the second portion being profiled to slide and rotate in the second channel. The second portion is offset from the first portion so that two different orientations of two blocks placed against each other are possible. The blocks preferably have a trapezoidal shape cut with only straight cuts to facilitate using natural stone.

Disclosed is a hammering device (1) comprising a hammer (2), an elongated linear carriage guide (3) including a first guide end (4) and a second guide end (5) at eithers ends of the elongated linear carriage guide (3) and a hammer carriage (6) arranged to be displaceable back and forth along the elongated linear carriage guide (3). The hammering device (1) further comprises a lifting line (7) connected to the hammer carriage (6) and to the hammer (2), so that the hammer (2) is displaced in response to displacement of the hammer carriage (6), wherein the lifting line (7) is extending from the hammer carriage (6) in a direction towards the first guide end (4). The hammering device (1) also comprises a displacement carriage (8) arranged to be displaceable back and forth along the elongated linear carriage guide (3), and displacement means (9) connected to the displacement carriage (8) and arranged to displace the displacement carriage (8), wherein the displacement carriage (8) is arranged between the hammer carriage (6) and the first guide end (4). Furthermore, a method for operating a hammering device (1) is disclosed.

A reciprocating power tool including a housing supporting a motor having a drive shaft, a blade clamp mechanism, and a drive mechanism. The drive clamp mechanism is coupled to the motor for converting rotational motion of the drive shaft into reciprocating motion of the blade clamp mechanism. The power tool includes an accessory having an attachment portion coupled to the blade clamp mechanism, and a body portion extending from the attachment portion. A grout rake is coupled to the body portion and includes a plurality of cutter portions. The grout rake is repositionable relative to the body portion between a first position and a second position. In the first position one of the plurality of cutter portions is located in a working position for contacting a workpiece, and in the second position another one of the plurality of cutter portions is located in the working position for contacting the workpiece.

A reciprocating power tool including a housing supporting a motor having a drive shaft, a blade clamp mechanism, and a drive mechanism. The drive clamp mechanism is coupled to the motor for converting rotational motion of the drive shaft into reciprocating motion of the blade clamp mechanism. The power tool includes an accessory having an attachment portion coupled to the blade clamp mechanism, and a body portion extending from the attachment portion. A grout rake is coupled to the body portion and includes a plurality of cutter portions. The grout rake is repositionable relative to the body portion between a first position and a second position. In the first position one of the plurality of cutter portions is located in a working position for contacting a workpiece, and in the second position another one of the plurality of cutter portions is located in the working position for contacting the workpiece.

The present invention relates to a device (10) and a method for removing contaminated material from a wall, the device (10) comprising suction plates (26) which fix a support system (13) of the device (10) to the wall by means of negative pressure, and a first rotating tool (14) that has impact cutters (16) in the circumferential direction. Disc-shaped saw blades (20) are provided in a second rotating tool (18) mounted upstream of the first rotating tool (14) in the working direction.

The present invention relates to a device (10) and a method for removing contaminated material from a wall, the device (10) comprising suction plates (26) which fix a support system (13) of the device (10) to the wall by means of negative pressure, and a first rotating tool (14) that has impact cutters (16) in the circumferential direction. Disc-shaped saw blades (20) are provided in a second rotating tool (18) mounted upstream of the first rotating tool (14) in the working direction.

The invention provides a block splitter assembly comprising first lower and second upper opposed splitter blade assemblies. The splitter blade assemblies have a splitting blade and two or more first forming blades. One forming blade is disposed to the right of and one forming blade is disposed to the left of the first splitting blade. The forming blades have forming edges. The splitting blade has a splitting edge that is straight, and the splitting blade has a greater maximum vertical dimension than the maximum vertical dimension of the forming blades. The splitting edge of the first splitting blade is opposed to the splitting edge of the second splitting blade.

The invention provides a block splitter assembly comprising first lower and second upper opposed splitter blade assemblies. The splitter blade assemblies have a splitting blade and two or more first forming blades. One forming blade is disposed to the right of and one forming blade is disposed to the left of the first splitting blade. The forming blades have forming edges. The splitting blade has a splitting edge that is straight, and the splitting blade has a greater maximum vertical dimension than the maximum vertical dimension of the forming blades. The splitting edge of the first splitting blade is opposed to the splitting edge of the second splitting blade.

A diagnostic system for measuring acceleration of a piston of a reciprocating hammer is disclosed. The diagnostic system may include a magnet configured to induce, via electromagnetic induction and based on a movement of the piston, an electric current in a conductor. The diagnostic system may include a capacitor electrically coupled to the conductor and configured to store electric power based on the electric current induced by the magnet. The diagnostic system may include an accelerometer configured to measure an acceleration of the piston. The diagnostic system may include a communication device powered by the capacitor and configured to output a signal that identifies the acceleration measured by the accelerometer.