A string trimmer includes: a string trimmer head; a drive device including a motor for driving the string trimmer head to rotate about a first axis; an operating device including a first housing for connecting a power supply device to supply power to the motor; and a connecting device for connecting the drive device to the operating device. The first housing is formed with an arm rest portion to be rested on, a coupling portion for coupling the power supply device, and a connecting portion connected to the connecting device; where the arm rest portion is disposed behind the connecting portion and configured to be squeezable by an arm when the string trimmer is operated; and an air inlet is disposed between the coupling portion and the connecting portion, where the air inlet communicates with the inside of the first housing.

An example powered appliance support system may include a shoulder strap and a powered appliance support strap. The shoulder step may include a padded portion to rest upon a shoulder of a person wearing the shoulder strap and a strap portion extending from the padded portion. The elastomeric stretcher may include a single body, wherein the elastomeric stretcher does not undergo stretching until experiencing a stretch triggering load at least 1 kg and no greater than 7 kg, wherein the elastomeric stretcher is formed from rubber or an elastomeric polymer and has first and second ends that inwardly taper.

A drive system includes a carrying device with a wearable carrying frame, an energy store carried by the carrying frame, and at least one electric drive motor carried by the carrying frame. A coupling device is configured to mechanically couple a work apparatus to the drive system. The carrying device is formed as a shoulder bag or backpack, having at least one strap that permits the carrying device to be worn over a shoulder of a user. Two straps may be provided that permit the carrying device to be worn over both shoulders of a user. Also disclosed is a tool having such a drive system and a work apparatus, which may be concrete vibrator.

Ergonomic gripping mechanisms of battery-operated electric cutting apparatus are provided. The electric cutting apparatus may include a cantilevered cutting head, an adjustable telescoping shaft, a rear grip portion, a pistol grip, and a forearm shaft. The adjustable telescoping shaft may be pivotally connected to the cantilevered cutting head. The rear grip portion may have a first end connected to the adjustable telescoping shaft. The pistol grip may have a first end extending at a first angle from the second end of the rear grip portion. The forearm shaft may extend from the second end of the pistol grip at a second angle. The forearm shaft may have a top side comprising a forearm pad having an exterior surface configured to receive a forearm of a user. The exterior surface of the forearm pad may be parallel to an axis defined by a longitudinal extension of the adjustable telescoping shaft.

A working machine may include an operation rod; a tool disposed on a front portion of the operation rod; a prime mover configured to drive the tool; a first harness connector disposed frontward of a center of gravity of the working machine and configured to be connected to a first end of the harness; and a second harness connector disposed rearward of the center of gravity of the working machine and configured to be connected to a second end of the harness opposite to the first end. In a side view of the working machine, the center of gravity of the working machine may be positioned on a first harness connector side with respect to a plane that passes through a midpoint of a line connecting the first harness connector with the second harness connector and is perpendicular to the line.

A powered tool device may include a first handle grip coupled to a first handle bar and a second handle grip coupled to a second handle bar. A first battery may be coupled to the first handle bar, and a second battery may be coupled to the second handle bar. The two handle bars, handle grips, and their respective batteries may be separated from each other via a separation structure that may separate the two handle bars by a distance which may allow portions of the body of a user to be between the handle bars. Optionally, the separation structure may be moved between an extended position and a compacted position.

A lawn trimmer including a cutting disc, a drive shaft; and a flexible drive shaft. The drive shaft is within a straight shaft, connected to the motor and extending to the flexible drive shaft, translating the rotation of the motor to the flexible drive shaft. The flexible drive shaft is within a curved shaft, parallel but not-colinear with the straight shaft, extends to a rotor head connected to the curved shaft, translating drive shaft rotation to a cutting disc comprising a plurality of cutting blades on a cutting plane; an intersection between the cutting plane and the curved shaft axis defines a predetermined oblique angle.

Disclosed herein is a swing assistance device for a brush cutter. The swing assistance device includes: a bracket; a coupling unit disposed on the top surface of the bracket, and coupled to a shaft at an inclined angle; left and right extension rods configured such that the outer ends thereof are located on both sides of a blade with the inner ends thereof coupled to both sides of the bracket; left and right rotation parts rotatably coupled to the outer ends of the left and right extension rods, and configured to, when the shaft swings in left-right directions, rotate while drawing arcs and assist in the swing operation; and a plurality of rotation rollers rotatably coupled to the outer circumference of each of the left and right rotation parts, and configured to, when the shaft swings in the left-right directions, rotate and assist in the swing operation.

A wheeled weed trimmer support assembly for using a weed trimmer to evenly and easily cut grass includes a rear support apparatus and a front support apparatus. The rear support apparatus comprises a rear clamp that is selectively engageable with a shaft of a weed trimmer and a rear support coupled to the rear clamp. A rotational joint is coupled to the rear support. A rear fork is coupled to a bottom portion of the rotational joint and a rear wheel is coupled to the rear fork. The front support apparatus comprises a front clamp that is selectively engageable with the shaft of the weed trimmer. A front support is coupled to the front clamp. A front fork is coupled to a front bottom end of the front support and a pair of front wheels is coupled to the front fork.

A carrier assembly for a harness for carrying a motor-driven power tool, the carrier assembly including a back plate and an interface plate including connections for shoulder straps. The back plate includes a coupling interface on a front face arranged to be removably connected to a corresponding coupling interface on a rear face of the interface plate. The coupling interface of the back plate is adapted to be connected to and disconnected from the coupling interface of the interface plate in an at least partially translational or linear movement which is substantially parallel to the back plate.