An oscillating blade for cutting or shaping sheet materials such as drywall, with a blade, a sharing portion, a depth gauge for determining depth of cut, a caliper portion for premarking sheet materials for a standard dimension cut, and a reverse direction blade.

An oscillating blade for cutting or shaping sheet materials such as drywall, with a blade, a sharing portion, a depth gauge for determining depth of cut, a caliper portion for premarking sheet materials for a standard dimension cut, and a reverse direction blade.

A blade for use with an oscillating power tool. The blade includes an attachment portion including a mounting aperture arrangement configured to couple with the oscillating power tool. The blade also includes a body extending from the attachment portion in a direction defining a longitudinal axis. The body includes a distal end generally opposite the attachment portion and first and second side edges extending between the attachment portion and the distal end. The blade also includes a channel open to one of the first or second side edges and extending towards the longitudinal axis from an open end to a closed end, the channel being defined by a first elongated edge and a second elongated edge opposed to the first elongated edge. At least one of the first or second elongated edges includes a chamfer.

A knife case and associated components and methods. The knife case includes a case body and a plurality of holders. For example, the case may be configured to hold a plurality of blade components configured to be interchangeably mounted on a handle. The knife may be an electric knife, and the case can include a battery dock for holding a spare battery.

A portable and easy-to-use alternate fish cutter is provided. It includes a housing constituting a handle, a cutting knife, a driving mechanism, a switch button, and a power supply module. The cutting knife includes a pair of left and right knives arranged side by side. It also includes left and right knife arms. It also includes a worm wheel arranged behind the left knife arm and the right knife arm. It also includes a left connecting rod and a right connecting rod. It also includes a worm and a motor for driving the worm wheel to rotate. Surfaces of the worm wheel and the worm are both provided with mutually meshing helical teeth. The structure of the invention is small and portable, fits the shape of traditional knives, can improve the efficiency and experience of slaughtering.

A safety knife is provided that includes a handle, defining a cavity with an opening on a first end, and including a print scanner and an activation trigger; a slider assembly including a half-nut and a blade; a motor configured to rotate a lead screw engaged with the half-nut when the print scanner matches a received biometric marker to a stored biometric marker and when the activation trigger is engaged to push the slider assembly in a first direction to expose the blade; and a return spring connected to the slider assembly and to a second end of the handle, wherein pushing the slider assembly in the first direction places the return spring under tension and the return spring pulls the slider assembly in a second direction to retract the blade into the cavity when the half-nut disengages the lead screw.

A safety knife is provided that includes a handle, defining a cavity with an opening on a first end, and including a print scanner and an activation trigger; a slider assembly including a half-nut and a blade; a motor configured to rotate a lead screw engaged with the half-nut when the print scanner matches a received biometric marker to a stored biometric marker and when the activation trigger is engaged to push the slider assembly in a first direction to expose the blade; and a return spring connected to the slider assembly and to a second end of the handle, wherein pushing the slider assembly in the first direction places the return spring under tension and the return spring pulls the slider assembly in a second direction to retract the blade into the cavity when the half-nut disengages the lead screw.

A power tool has a motor having a rotary shaft, an eccentric shaft configured to be rotated around a rotation center axis of the rotary shaft, and a balancer configured to rotate with the rotary shaft. When viewed along the rotation center axis, (1) a first imaginary line passes the rotation center axis and an eccentric axis, (2) an imaginary perpendicular line crosses perpendicularly to the first imaginary line and passes the rotation center axis, (3) a center of gravity of the balancer is located in a region on a side opposite to the eccentric axis across the imaginary perpendicular line; and (4) a second imaginary line passes the rotation center axis and the center of gravity of the balancer and (5) the second imaginary is inclined at an inclination angle larger than 0° and smaller than 90° in a direction opposite to a rotating direction of the rotary shaft.

A power tool has a motor having a rotary shaft, an eccentric shaft configured to be rotated around a rotation center axis of the rotary shaft, and a balancer configured to rotate with the rotary shaft. When viewed along the rotation center axis, (1) a first imaginary line passes the rotation center axis and an eccentric axis, (2) an imaginary perpendicular line crosses perpendicularly to the first imaginary line and passes the rotation center axis, (3) a center of gravity of the balancer is located in a region on a side opposite to the eccentric axis across the imaginary perpendicular line; and (4) a second imaginary line passes the rotation center axis and the center of gravity of the balancer and (5) the second imaginary is inclined at an inclination angle larger than 0° and smaller than 90° in a direction opposite to a rotating direction of the rotary shaft.

In some embodiments, a cutting system including a movable blade or a reciprocating blade operably coupled to a motor is disclosed, wherein the cutting system comprises a diverting feature. In some embodiments, a diverter proximity relative to the movable blade or reciprocating blade is selected to facilitate diversion of a material during cutting. In at least one embodiment, the movable blade may be movable blade for an oscillating tool. A cutting system according to the present invention may be coupled to a container, for example, a residential trash container or a residential recycling container.