An earth auger includes a transmission assembly arranged on a connecting base, a motor assembly connected with the transmission assembly and driving the transmission assembly to rotate, a controller arranged at a first side of the transmission assembly and connected with the motor assembly, a control knob and a plurality of indicator lights arranged on a housing, and a gyroscope sensor. The controller controls a rotation of the motor assembly through an on-off of a circuit. Angular velocities and angular acceleration critical values of different gears are set through the control knob. The indicator lights are used to display a current gear, and the gyroscope sensor is arranged on a second side of the transmission assembly. The gyroscope sensor obtains angular velocity information and angular acceleration information, and feedbacks a monitored signal to the controller. When the monitored signal exceeds a preset critical value, the controller stops the motor.

Systems and methods for creating a weep hole in an uncured, concrete, hollow core structural component having one or more external surfaces and one or more internal surfaces. The weep hole is drilled using a drilling apparatus comprising a drill, a rotating drill bit with an internal fluid passageway, a power source, and a pressurized fluid source. Loose, uncured concrete material deposited near the weep hole on the one or more internal surface as a result of drilling the weep hole is removed by releasing pressurized fluid which flows from the pressurized fluid source, through the drill and the rotating drill bit.

A tool assembly and an attachment apparatus are provided, including a drive shaft extending along a longitudinal direction and forming a groove. A latch includes a notch configured to extend into the groove at the drive shaft. A coupler extends along the longitudinal direction and forms a cavity extending along the longitudinal direction. A tool end opening is formed at the first end of the coupler through which the drive shaft extends into the cavity along the longitudinal direction. The coupler forms a latch opening extending along the longitudinal direction and into the cavity. The latch is positioned in the cavity through the latch opening. A collar extends at least partially around the coupler. The collar is articulatable along the longitudinal direction around the latch opening.

Disclosed herein is a hand-held power tool including a motor housing, a motor in the motor housing, an anger coupled to the motor and having a rotational axis, and a first handle coupled to the motor housing and including a grip. In some embodiments, the rotational axis of the anger and an axis of the grip subtend to an acute angle.

An apparatus for drilling a hole in a golf green. The apparatus includes a support frame, a moveable cutter head, a handle, a base, a tread plate, an ejection mechanism, a drive motor configured to power the operation of the apparatus and control device. A drive shaft connects the drive motor with the cutter head via a threaded coupling. The cutter head is advanced relative to the tread plate when the drive shaft is rotated in one rotational direction and is retracted relative to the tread plate when the drive shaft is rotated in the opposite rotational direction. The drive shaft is provided with a central threaded portion and a non-threaded end portion at each end of the thread. The non-threaded end portions act as slip couplings configured to allow a rotation of the drive shaft without axial movement of the threaded coupling to stop the cutter head.

A drill, a chuck and a method operating the drill in extraterrestrial environments is disclosed. The drill includes a percussive powerhead having a percussion motor, cam assembly, and a hammer section. An auger assembly is provided having a motor. A hammer assembly is provided. A chuck assembly is provided. A drill tool is coupleable to the powerhead. The drill tool includes a plurality of external flutes. An internal bore is configured to collect a sample. A first stem is provided having a toothed distal end having a bit and a proximal end having an opening with internal threads configured to allow attachment of a second drill tool without interrupting the internal bore or the external flutes.