An electric circular saw includes a saw blade, a motor, a housing, a bottom plate, a worm gear assembly and a power supply device. The saw blade is configured to rotate about a first axis. The motor has a motor shaft for driving the saw blade to rotate. The housing has an accommodating portion for accommodating the motor. The worm gear assembly realizes power transmission between the motor and the saw blade. The power supply device includes at least one battery pack to power the motor. The ratio of the nominal voltage of one battery pack to the weight of the electric circular saw is greater than or equal to 6 V/Kg and less than or equal to 12 V/Kg.

An electric circular saw includes a saw blade, a motor, a housing, a bottom plate, a worm gear assembly and a power supply device. The saw blade is configured to rotate about a first axis. The motor has a motor shaft for driving the saw blade to rotate. The housing has an accommodating portion for accommodating the motor. The worm gear assembly realizes power transmission between the motor and the saw blade. The power supply device includes at least one battery pack to power the motor. The ratio of the nominal voltage of one battery pack to the weight of the electric circular saw is greater than or equal to 6 V/Kg and less than or equal to 12 V/Kg.

An electric tool includes a functional piece, a motor, a case and a fan. The case includes a motor case portion. An airflow inlet and an airflow outlet are formed in the case. When the fan operates, an airflow at the airflow inlet is taken out and is directed to the airflow outlet after the airflow flows through the motor. The motor case portion includes an encircling portion which encircles the motor and an end portion arranged on one end of the encircling portion. A stopping piece stops the airflow from flowing back from one side of the motor to the other side.

An electric tool includes a functional piece, a motor, a case and a fan. The case includes a motor case portion. An airflow inlet and an airflow outlet are formed in the case. When the fan operates, an airflow at the airflow inlet is taken out and is directed to the airflow outlet after the airflow flows through the motor. The motor case portion includes an encircling portion which encircles the motor and an end portion arranged on one end of the encircling portion. A stopping piece stops the airflow from flowing back from one side of the motor to the other side.

The present invention is an attachable rolling plate assembly which can be attached as a single unit to a portable cutting tool to facilitate the safe rolling movement of the portable cutting tool on the workpiece. The invention comprises a frame assembly formed from a single piece of molded material such as fiber enriched plastic having a pair of oppositely disposed longitudinal sidewalls with stabilizer ribs extending therefrom, and a flat base portion having and opening through which a saw of a power saw extends. The plate has front and rear fastening members to retain a plate of a power cutting saw onto the rolling plate assembly. The invention also includes a cutting guide assembly to facilitate a straight cut, reduce torsional rotation of the saw blade and reduce kickback of the saw.

The present invention is an attachable rolling plate assembly which can be attached as a single unit to a portable cutting tool to facilitate the safe rolling movement of the portable cutting tool on the workpiece. The invention comprises a frame assembly formed from a single piece of molded material such as fiber enriched plastic having a pair of oppositely disposed longitudinal sidewalls with stabilizer ribs extending therefrom, and a flat base portion having and opening through which a saw of a power saw extends. The plate has front and rear fastening members to retain a plate of a power cutting saw onto the rolling plate assembly. The invention also includes a cutting guide assembly to facilitate a straight cut, reduce torsional rotation of the saw blade and reduce kickback of the saw.

A cordless aw is provided with regenerative braking means that increases the number of repeated cuttings the saw is able to perform (x) per full discharge cycle of the battery pack, as compared to the number of repeated cuttings achievable by the same saw not employing a regenerative braking means (y) per full discharge cycle of the battery pack, such that x/y is approximately at least one of the following: i) 1.1 when cutting a Pressure-Treated (PT) lumber workpiece having a cross-sectional size of approximately 89 mm89 mm2 mm, ii) 1.15 when cutting a Spruce Pine Fir (SPF) lumber workpiece having a cross-sectional size of approximately 38 mm89 mm2 mm, or iii) 1.25 when cutting Medium Density Fiberboard (MDF) workpiece having a thickness of approximately 19 mm1 mm and a width of approximately 76 mm2 mm.

A cordless aw is provided with regenerative braking means that increases the number of repeated cuttings the saw is able to perform (x) per full discharge cycle of the battery pack, as compared to the number of repeated cuttings achievable by the same saw not employing a regenerative braking means (y) per full discharge cycle of the battery pack, such that x/y is approximately at least one of the following: i) 1.1 when cutting a Pressure-Treated (PT) lumber workpiece having a cross-sectional size of approximately 89 mm89 mm2 mm, ii) 1.15 when cutting a Spruce Pine Fir (SPF) lumber workpiece having a cross-sectional size of approximately 38 mm89 mm2 mm, or iii) 1.25 when cutting Medium Density Fiberboard (MDF) workpiece having a thickness of approximately 19 mm1 mm and a width of approximately 76 mm2 mm.

Provided is a DC power supply device If an electrical tool (81) of a rated voltage of 36 V is connected to the DC power supply device (1) (if the voltage of a lower positive terminal indicates the presence of a short bar), a microcomputer (30) performs control so as to switch a switching element (Q1) on and output a DC voltage of 36 V between an upper positive terminal and the upper negative terminal. If an electrical tool (81) of a rated voltage of 18 V is connected to the DC power supply device (1) (if the voltage of the lower positive terminal indicates the absence of a short bar), the microcomputer (30) performs control so as to switch a switching element (Q2) on and output a DC voltage of 18 V between the upper positive terminal and the upper negative terminal.

An elongated bar support device, such as which can be used in singular fashion with an elongated beam or in paired fashion with a flattened sheet board material. An elongated body has a main extending section for supporting an underside of the board or beam. An intermediate section includes a multi-angled recess which extends below the support surface. A forward most portion of each bar support extends in angled or sloping fashion relative to a horizontal extending axis associated with the main extending section. A pair of support dowels extend in linearly spaced apart and inward (cross directed) fashion from the forward extending portion of each bar, to contact opposite surfaces of the plywood or sheet board at support locations forward of the intermediate crosswise recess and opposite a rearward extending direction of the main support section. Upon widthwise sectioning, the opposite surface supporting dowels retain the incised portion in position, without bending or buckling.