Abstract: As a cooling draft flows from a rear side to a front side of battery cells (72) inside a battery pack (30), it is divided into two cooling drafts (F1, F2) in a left-right direction, which is the direction that the battery cells (72) are disposed in parallel, and those two cooling drafts respectively flow through a plurality of passageways that longitudinally extend along the battery cells (72). More particularly, a second battery cell (722) is cooled by the cooling draft flowing in a second ventilation-path volume (Q2) before a first battery cell (721) and a third battery cell (723) are cooled by cooling drafts respectively flowing in a first ventilation-path volume (Q1) and a third ventilation-path volume (Q3), which are longer than the second ventilation-path volume (Q2).

Abstract: A battery pack (30) is configured to couple to a power tool (10) by sliding in a sliding direction and it contains a plurality of cells (31). A pair of battery-side, electric-power terminals (312a, 312b, 314a, 314b) and a battery-side signal terminal (313) can be electrically connected to a pair of tool-side, power-supply terminals (212, 214) and a tool-side signal terminal (213), respectively, which are provided on the power tool (10). The pair of battery-side, electric-power terminals (312a, 312b, 314a, 314b) and the battery-side signal terminal (313) are disposed in parallel adjacently in a direction that intersects the sliding direction.

Abstract: A battery pack may include a drainage device provided at a bottom portion of the housing case. The drainage device may include a drain hole communicating between the inside and the outside of the housing case, so that water introduced into the housing case is discharged to the outside of the housing case. The drainage device may be disposed between two of the terminal members that are connected to electrodes of the battery cells.

Abstract: A battery pack may include a drainage device provided at a bottom portion of the housing case. The drainage device may include a drain hole communicating between the inside and the outside of the housing case, so that water introduced into the housing case is discharged to the outside of the housing case. The drainage device may be disposed between two of the terminal members that are connected to electrodes of the battery cells.

Abstract: A chatter vibration detection method includes acquiring vibration data of a tool (4) at a time of machining a workpiece at a predetermined sampling period (?t), calculating an autocorrelation coefficient (Rxx?) corresponding to a time required for a cutting edge (4a, 4b) to contact the workpiece (W) several times based on acquired time series vibration data and calculating a period (Tx) of characteristics of the calculated autocorrelation coefficient (Rxx?), and deciding that chatter vibration occurs when a contact period (T1) at which the cutting edge (4a, 4b) contacts the workpiece (W) is not an integral multiple of the calculated period (Tx).

Abstract: A semiconductor device includes a mesh-patterned power source wiring that supplies respective circuits with a power source voltage supplied to a plurality of locations at an outer periphery of the semiconductor device. The semiconductor device also includes a back-biasing wiring supplying, to a semiconductor substrate, a substrate voltage that controls a threshold voltage of a semiconductor element. The back-biasing wiring includes a upper layer mesh wiring that receives a supply of a substrate voltage, and a lower layer mesh wiring that is provided in a different wiring layer from the upper layer mesh wiring. The outer peripheries of the upper layer mesh wiring and the lower layer mesh wiring are connected to each other through plural vias.

Abstract: A battery pack may include a drainage device provided at a bottom portion of the housing case. The drainage device may include a drain hole communicating between the inside and the outside of the housing case, so that water introduced into the housing case is discharged to the outside of the housing case. The drainage device may be disposed between two of the terminal members that are connected to electrodes of the battery cells.

Abstract: A battery housing portion S includes regulating members 30 adapted to fit grooves of a battery pack having a T-shape cross section, so that the battery pack can be housed in the battery housing portion S in the state that the both regulating members 30 fit the grooves. The regulating members 30 regulate housing orientation of the battery pack 20, so that misjudgment about orientation of the battery pack 20 is prevented. In addition, if the orientation has been misjudged, an operator can notice such misjudgment immediately, thereby improving the operability during mounting the battery pack 20.

Abstract: A battery pack may include a drainage device provided at a bottom portion of the housing case. The drainage device may include a drain hole communicating between the inside and the outside of the housing case, so that water introduced into the housing case is discharged to the outside of the housing case. The drainage device may be disposed between two of the terminal members that are connected to electrodes of the battery cells.

Abstract: Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion (11a) on the front side.

Abstract: A battery housing of a tool battery has a hook accommodation chamber and a battery cell accommodation chamber defined therein. A hook is accommodated within the hook accommodation chamber and is operable to lock and unlock the tool battery against a tool body of a power tool. Battery cells are disposed within the battery cell accommodation chamber. The hook accommodation chamber and the battery cell accommodation chamber are partitioned from each other.

Abstract: A chatter vibration detection method includes acquiring vibration data of a tool (4) at a time of machining a workpiece at a predetermined sampling period (?t), calculating an autocorrelation coefficient (Rxx?) corresponding to a time required for a cutting edge (4a, 4b) to contact the workpiece (W) several times based on acquired time series vibration data and calculating a period (Tx) of characteristics of the calculated autocorrelation coefficient (Rxx?), and deciding that chatter vibration occurs when a contact period (T1) at which the cutting edge (4a, 4b) contacts the workpiece (W) is not an integral multiple of the calculated period (Tx).

Abstract: Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion (11a) on the front side.

Abstract: Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion (11a) on the front side.

Abstract: A battery housing portion S includes regulating members 30 adapted to fit grooves of a battery pack having a T-shape cross section, so that the battery pack can be housed in the battery housing portion S in the state that the both regulating members 30 fit the grooves. The regulating members 30 regulate housing orientation of the battery pack 20, so that misjudgment about orientation of the battery pack 20 is prevented. In addition, if the orientation has been misjudged, an operator can notice such misjudgment immediately, thereby improving the operability during mounting the battery pack 20.

Abstract: Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion (11a) on the front side.

Abstract: A charger is adopted to charge a first-type battery pack and a second-type battery pack, each type of battery packs having an insertion portion whose shapes are different. The charger is provided with a housing having a battery pack socket for inserting the battery packs. The battery pack socket has a shape that allows the insertion portion of the first-type battery pack and the insertion portion of the second-type battery pack to be inserted thereto selectively in a prescribed attitude. A pair of output terminals that output charging power is disposed within the battery pack socket. The pair of output terminals is electrically connected to the first-type battery pack when the insertion portion of the first-type battery pack is inserted into the battery pack socket in the prescribed attitude.

Abstract: A battery housing of a tool battery has a hook accommodation chamber and a battery cell accommodation chamber defined therein. A hook is accommodated within the hook accommodation chamber and is operable to lock and unlock the tool battery against a tool body of a power tool. Battery cells are disposed within the battery cell accommodation chamber. The hook accommodation chamber and the battery cell accommodation chamber are partitioned from each other.

Abstract: An electric device according to the present invention includes a main body portion of the electric device that is designed to be connected to a battery park. A connecting portion for connecting the battery pack is formed to the main body portion of the electric device. A terminal supporting plate having at least a pair of terminals and for connecting terminals of the battery pack is fixed to the connecting portion. The terminals and are arranged on a front surface side of the terminal supporting plate that is exposed from the connecting portion. An electric material component is arranged on a rear surface side of the terminal supporting plate.

Abstract: Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion (11a) on the front side.