A novel cutting method and apparatus includes a cutting blade adapted to consistently and easily form a desirable kerf in a concrete substrate while capturing substantially all resulting concrete dust.

A blade drive shaft assembly (100) for a road saw comprising a shaft (120), a first mounting plate (125), a spacer removably fitted (126) on the shaft (120), a second mounting plate (127) removably fitted on the shaft (120), a mounting plate fixing adapted to secure the second mounting plate (127) to the shaft, a first circular saw blade mounted between the first mounting plate and the spacer (126), and a second circular saw blade mounted between the second mounting plate (127) and the spacer (126), wherein the first mounting plate (125) is integrally formed with the shaft (120) from a single piece of metal. A road saw incorporating the assembly is also described, as well as a method of forming, filling and compacting a trench and a method of making a blade drive shaft assembly.

A material cutting device includes a rotatably mounted tool holder configured to carry a cutting tool and a drive for rotating the tool holder. The drive includes an electric motor with a rotor and a stator. The axis of rotation of the rotor of the electric motor and the axis of rotation of the tool holder are arranged coaxially. The stator encloses the rotor over an angle of less than 360 degrees.

An electric working machine may include an output shaft, a rotary blade attached to the output shaft, an output pulley fixed to the output shaft, an input shaft, an input pulley fixed to the input shaft, a transmission belt wrapped around the input pulley and the output pulley, an electric motor including a motor shaft and configured to rotate the motor shaft, a speed reducer configured to reduce a speed of rotation of the motor shaft and transmit the rotation to the input shaft, and a housing that houses the electric motor and the speed reducer, and rotatably supports the input shaft and the output shaft. A rotation axis of the motor shaft may be inclined with respect to a direction which is along a rotation axis of the output shaft.

A novel cutting method and apparatus includes a cutting blade adapted to consistently and easily form a desirable kerf in a concrete substrate while capturing substantially all resulting concrete dust.

A cart for carrying a cut-off saw having a saw blade. The cart includes a frame with upper and lower portions, a wheel arm pivotably coupled to the lower portion about a first axis, and a rear wheel assembly coaxial with the first axis and coupled to the frame and the wheel arm. The cart includes a front wheel coupled to an end of the wheel arm opposite the rear wheel assembly, an adjustment lever pivotably coupled to the upper portion about a second axis, and a link having a first end pivotably coupled to the adjustment lever and spaced from the second axis, and a second end pivotably coupled to the wheel arm between the first axis and the front wheel. Pivoting the adjustment lever about the second axis pivots the wheel arm about the first axis to adjust a vertical position of the front wheel relative to the upper portion.

A power tool includes a housing, a motor located within the housing, a drive assembly located within the housing and connected to an output of the motor, at least one cutting wheel coupled to the drive assembly, and at least one switch configured to control activation of the motor for directional rotation of the drive assembly in either a forward rotational direction or a reverse rotational direction. The drive assembly is configured to operate in the reverse rotational direction during dry cutting. The drive assembly is configured to operate in the forward rotational direction during wet cutting.

A device for covering a cut gap which can be produced by a machine tool. The device can be connected to a dust suctioning device so that the dust produced while working with the machine tool can be removed from the working area of the machine tool using the dust suctioning tool. A second aspect of the invention relates to a system consisting of at least two proposed devices. Another aspect of the invention relates to a method for suctioning dust from a working region of a machine tool. The device includes sealing caps which can be connected to a dust suctioning device via suction connecting pieces. Furthermore, the sealing caps are used to seal the working area in which the working process of the machine tool is carried out.

A novel cutting method and apparatus includes a cutting blade adapted to consistently and easily form a desirable kerf in a concrete substrate while capturing substantially all resulting concrete dust.

A ring saw includes a ring saw blade, a tool holder that guides the ring saw blade in a cutting plane, a receiving space in which the tool holder is disposed, a motor, and a driving wheel where the ring saw blade is drivable in the cutting plane by the driving wheel and the driving wheel is coupled to the motor. A guide roller is disposed on a side of the cutting plane where the ring saw blade is guidable by the guide roller from the side and where an outlet of a water flushing system is directed at the guide roller.