A lawn trimmer attachment for trimming sprinkler heads has downwardly extending cutting blades which may be inserted into the blade sockets to adjust the distance between the blades. An adjustable lawn edging attachment for trimming around sprinkler heads comprises a body, an adapter extending upward from the body, two or more elongated arms extending outward from the periphery of the body, two or more blade sockets along a longitudinal direction on a bottom side of each of the two or more elongated arms, and a blade extending downward from the bottom of each of the two or more elongated arms. The adjustable lawn edging attachment further comprises a spring biased interlock pin on the distal end, where the spring biased interlock pin extends through the blade base to lock the blade into one of the two or more blade sockets on each of the two or more elongated arms.

A lawn trimmer attachment for trimming sprinkler heads has downwardly extending cutting blades which may be inserted into the blade sockets to adjust the distance between the blades. An adjustable lawn edging attachment for trimming around sprinkler heads comprises a body, an adapter extending upward from the body, two or more elongated arms extending outward from the periphery of the body, two or more blade sockets along a longitudinal direction on a bottom side of each of the two or more elongated arms, and a blade extending downward from the bottom of each of the two or more elongated arms. The adjustable lawn edging attachment further comprises a spring biased interlock pin on the distal end, where the spring biased interlock pin extends through the blade base to lock the blade into one of the two or more blade sockets on each of the two or more elongated arms.

A hand-guided garden, forestry and/or construction working apparatus has an inactive state, an active state and a variable setting, as well as an apparatus operator control element which can be activated by a user. In the inactive state, the garden, forestry and/or construction working apparatus is designed to be transferred into the active state triggered by activation of the apparatus operator control element, and in the active state the garden, forestry and/or construction working apparatus is designed to change the setting and not to be transferred into the inactive state triggered by activation of the apparatus operator control element.

A de-grassing system having a body, a handle, and a cutter; the body having a longitudinal hollow chamber with an axis extending axially there through, with a top and bottom, the chamber further having a port permitting water to egress; the handle having a longitudinal hollow cylinder having a proximal and distal end, wherein the proximal end has a substantially perpendicular longitudinal hollow cylinder affixed thereto at the midpoint of the substantially perpendicular longitudinal hollow cylinder, wherein the substantially perpendicular longitudinal cylinder has a pair of ends providing means for rotating the system about the axis; the top connecting outwardly from the chamber for receiving the distal end of the handle; and the cutter forming the bottom, having a plurality of teeth extending axially outwardly from the chamber to engulf the sprinkler head.

A blade assembly for cutting roots is installed on a hand-carried weed cutter or hand-carried side walk edger. The blade assembly has a central blade support that supports a central blade. A plurality of cutting blades are stacked on both sides of the central blade to form a stack of blades. The stack of blades is secured together by fasteners that pass through openings in the blades. The central blade and each of the plurality of cutting blades has a plurality of teeth. Outermost blades in the stack of blades are smaller in diameter than the blades directly adjacent to the outermost blades.

A cutting head for use with a cutting tool, such as a grass trimmer. The cutting head has a housing, a line spool and a supporting cap. One end of the housing is coupled to an end of a motor output shaft and another end has an opening. A line spool is disposed in the housing and rotates along with the housing. At least one end of a line wound around the line spool extends out of the housing. The supporting cap is rotatably disposed at the end of the line spool adjacent to the opening and is exposed to an exterior of the housing through the opening.

A blade assembly for cutting roots is installed on a hand-carried weed cutter or hand-carried side walk edger. The blade assembly comprises a central blade support that supports a central blade. A plurality of cutting blades are stacked on both sides of the central blade to form a stack of blades. The stack of blades is secured together by fasteners that pass through openings in the blades. The central blade and each of the plurality of cutting blades comprises a plurality of teeth. Outermost blades in the stack of blades are smaller in diameter than the blades directly adjacent to the outermost blades.

An apparatus for cutting an edging trench around a landscape bed is constructed with a cutting blade that is rotated to help move the apparatus in the desired direction of travel while being operated to create an edging trench. The machine can be constructed in self-propelled, non-self-propelled or manually operated stick forms. The apparatus has a cutting blade that is configured in a cone-shaped manner with the narrow diameter located toward the center of the apparatus. The rotor is formed with a pair of thin slicing blades mounted on a spline shaft removable from the apparatus for maintenance. A first slicing blade shears the grass along the top of the trench and forms a vertical wall, while a second slicing blade forms a sloped wall. Displaced soil is discharged from the cutting blade and spread directly over the adjacent landscape bed to eliminate the need for subsequent clean-up operations.

A handheld electric tool includes a working device for performing a function of the handheld electric tool, a powering device for provide a driving force to the working device, and a connecting device for connecting the working device and powering device. The powering device includes: an electric motor, a power housing having an air inlet and an air outlet, a transmission mechanism for transmitting power generated by the electric motor and a circuit board for controlling the electric motor, a fan can be driven by the electric motor to provide an airflow which flows from the air inlet to the air outlet. The circuit board, the transmission mechanism and the electric motor are disposed between the air inlet and the air outlet such that the airflow flows through the circuit board, the transmission mechanism and the electric motor successively. The handheld electric tool has excellent cooling effect.

A laser projection apparatus includes a laser source assembly, an optical modulator, a display control circuit, and a signal shaping circuit. The laser source assembly is configured to be turned on or turned off under driving of a target driving signal. The display control circuit is configured to: output an image display driving signal to the optical modulator, and synchronously output an initial driving signal to the laser source assembly. The initial driving signal includes an initial enable signal and an initial brightness adjustment signal. The signal shaping circuit is disposed in a path for transmitting at least one of the initial enable signal or the initial brightness adjustment signal to the laser source assembly. The signal shaping circuit is configured to output a shaping signal. The shaping signal is superimposed on the initial enable signal or the initial brightness adjustment signal to form the target driving signal.