Abstract: A reduced water mist generating device (1) is provided with a water acquiring section (3) that acquires water for generating reduced water, a reduced water generating unit (U) that generates the reduced water from the acquired water, a reduced water atomizing section (6) that atomizes the generated reduced water, and a spraying section (7) that sprays the atomized water. With such a configuration, the reduced water can be generated from water, drifted in the form of a mist in a space, and caused to arrive at an object.

Abstract: A reduced water mist generating device (1) is provided with a water acquiring section (3) that acquires water for generating reduced water, a reduced water generating unit (U) that generates the reduced water from the acquired water, a reduced water atomizing section (6) that atomizes the generated reduced water, and a spraying section (7) that sprays the atomized water. With such a configuration, the reduced water can be generated from water, drifted in the form of a mist in a space, and caused to arrive at an object.

Abstract: A battery pack for a power tool of self-contained over-charge protection is proposed. The battery pack includes a battery stack composed of a plurality of series connected secondary cells, and a charge terminal connected through a charge current path to the battery stack for flowing a charge current from a charger. The battery pack includes an interrupter inserted in the charge current path, and an over-charge detector which detects a cell voltage across each of the secondary cells and actuates the interrupter to open the charge current path when any one of the cell voltages becomes higher than a predetermined threshold (VTH3). Thus, even if the charger fails to limit the charge current, the battery pack can itself protect the secondary cells from being over-charged.

Abstract: A battery pack for a power tool has a less-current consuming over-discharge protection. The battery pack includes a battery stack composed of a plurality of series connected secondary cells, and a discharge detector configured to monitor a cell voltage across each of the secondary cells and to provide a discharge stop signal when any one of the cell voltages becomes lower than a predetermined threshold. The discharge stop signal is fed to deenergize the power tool. The discharge detector is composed of a voltage monitor and a power controller. The voltage monitor includes a plurality of comparators and a plurality of constant voltage elements each providing a constant voltage determining the threshold. Each comparator is configured to compare each cell voltage with the threshold to give a comparison result. The voltage monitor is energized by the battery stack to provide the discharge stop signal based upon the comparison results.

Abstract: A rotary impact tool can be used in a work especially precision or finishing of fastening is important. The rotary impact tool comprises a rotary driving mechanism including a driving source for rotating a driving shaft, a hammer fixed on the driving shaft, an output shaft to which a driving force is applied by impact blow of the hammer, a torque setting unit used for setting a fastening torque, a processor for calculating fastening torque from impact blow of the hammer, a rotation speed setting unit used for setting rotation speed of the driving shaft, and a controller for rotating the driving shaft of the rotary driving mechanism in a rotation speed set in the rotation speed setting unit and for stopping rotation of the driving shaft of the rotary driving mechanism when the fastening torque calculated in the processor becomes equal to or larger than a reference value of fastening torque previously set in the torque setting unit.

Abstract: A battery pack for a power tool has a less-current consuming over-discharge protection. The battery pack includes a battery stack composed of a plurality of series connected secondary cells, and a discharge detector configured to monitor a cell voltage across each of the secondary cells and to provide a discharge stop signal when any one of the cell voltages becomes lower than a predetermined threshold. The discharge stop signal is fed to deenergize the power tool. The discharge detector is composed of a voltage monitor and a power controller. The voltage monitor includes a plurality of comparators and a plurality of constant voltage elements each providing a constant voltage determining the threshold. Each comparator is configured to compare each cell voltage with the threshold to give a comparison result. The voltage monitor is energized by the battery stack to provide the discharge stop signal based upon the comparison results.

Abstract: A battery pack for a power tool of self-contained over-charge protection is proposed. The battery pack includes a battery stack composed of a plurality of series connected secondary cells, and a charge terminal connected through a charge current path to the battery stack for flowing a charge current from a charger. The battery pack includes an interrupter inserted in the charge current path, and an over-charge detector which detects a cell voltage across each of the secondary cells and actuates the interrupter to open the charge current path when any one of the cell voltages becomes higher than a predetermined threshold (VTH3). Thus, even if the charger fails to limit the charge current, the battery pack can itself protect the secondary cells from being over-charged.

Abstract: In a power fastening tool for fastening a fastening member such as a screw or a fastening member, malfunction that driving of a motor is stopped before the fastening member is fastened completely can be prevented. A fastening judger judges that the fastening operation is completed when a value of an estimated torque T for fastening the fastening member becomes larger than a predetermined lower limit value T1 previously set by a user and a value of a torque variation ratio ??T varies from positive to negative. Thus, it is possible to prevent malfunction for stopping driving of a motor even when the value of the torque variation ratio ??T varies from positive to negative due to trouble before the vale of the estimated torque T becomes larger than the lower limit value T1.

Abstract: In a power impact tool for fastening a screw or a bolt, malfunction that driving of a motor is stopped before the screw or the bolt is fastened completely can be prevented. A fastening judger judged that the fastening operation is completed at least when a torque variation ratio becomes substantially zero and a reference index becomes equal to or larger than a threshold value of trouble judgment. The reference index is a number of impact of a hammer in a term in which the torque variation ratios take positive values, and the threshold value of trouble judgment is calculated with using a maximum value of the torque variation ratio in the term. Since the number of the impact of the hammer due to trouble in fastening operation is smaller than that due to the screw or the bolt is fastened completely, it is possible to distinguish the increase of the torque in the former case from the increase of the torque in the latter case.

Abstract: A rotary impact tool can be used in a work especially precision or finishing of fastening is important. The rotary impact tool comprises a rotary driving mechanism including a driving source for rotating a driving shaft, a hammer fixed on the driving shaft, an output shaft to which a driving force is applied by impact blow of the hammer, a torque setting unit used for setting a fastening torque, a processor for calculating fastening torque from impact blow of the hammer, a rotation speed setting unit used for setting rotation speed of the driving shaft, and a controller for rotating the driving shaft of the rotary driving mechanism in a rotation speed set in the rotation speed setting unit and for stopping rotation of the driving shaft of the rotary driving mechanism when the fastening torque calculated in the processor becomes equal to or larger than a reference value of fastening torque previously set in the torque setting unit.

Abstract: A rotary impact tool can be used in a work especially precision or finishing of fastening is important. The rotary impact tool comprises a rotary driving mechanism including a driving source for rotating a driving shaft, a hammer fixed on the driving shaft, an output shaft to which a driving force is applied by impact blow of the hammer, a torque setting unit used for setting a fastening torque, a processor for calculating fastening torque from impact blow of the hammer, a rotation speed setting unit used for setting rotation speed of the driving shaft, and a controller for rotating the driving shaft of the rotary driving mechanism in a rotation speed set in the rotation speed setting unit and for stopping rotation of the driving shaft of the rotary driving mechanism when the fastening torque calculated in the processor becomes equal to or larger than a reference value of fastening torque previously set in the torque setting unit.

Abstract: A rotary impact tool can be used continuously for fastening a plurality of fastening members such as screws, bolts or nuts in tight fastening mode. The rotary impact tool comprises a rotary driving mechanism including a motor for rotating a driving shaft, a hammer engaged with the driving shaft, an output shaft to which a driving force is applied by impact blow of the hammer, a main switch operated by a user for controlling fastening operation, and a controller for controlling on and off of the motor. The controller has a normal fastening mode and a tight fastening mode, and a tight fastening mode setting switch used for setting the tight fastening mode is further comprised. When the tight fastening mode setting switch is switched on, the controller continuously drives the rotary driving mechanism so as to perform tight fastening operation continuously.

Abstract: In a power impact tool for fastening a fastening member, a torque for fastening the fastening member can be estimated without using a high-resolution sensor and a high-speed processor.

Abstract: In a power impact tool for fastening a fastening member, a torque for fastening the fastening member can be estimated without using a high-resolution sensor and a high-speed processor.

Abstract: In a power fastening tool for fastening a fastening member such as a screw or a fastening member, malfunction that driving of a motor is stopped before the fastening member is fastened completely can be prevented. A fastening judger judges that the fastening operation is completed when a value of an estimated torque T for fastening the fastening member becomes larger than a predetermined lower limit value T1 previously set by a user and a value of a torque variation ratio ??T varies from positive to negative. Thus, it is possible to prevent malfunction for stopping driving of a motor even when the value of the torque variation ratio ??T varies from positive to negative due to trouble before the vale of the estimated torque T becomes larger than the lower limit value T1.

Abstract: In a power impact tool for fastening a screw or a bolt, malfunction that driving of a motor is stopped before the screw or the bolt is fastened completely can be prevented. A fastening judger judged that the fastening operation is completed at least when a torque variation ratio becomes substantially zero and a reference index becomes equal to or larger than a threshold value of trouble judgment. The reference index is a number of impact of a hammer in a term in which the torque variation ratios take positive values, and the threshold value of trouble judgment is calculated with using a maximum value of the torque variation ratio in the term. Since the number of the impact of the hammer due to trouble in fastening operation is smaller than that due to the screw or the bolt is fastened completely, it is possible to distinguish the increase of the torque in the former case from the increase of the torque in the latter case.

Abstract: A leakage detecting device for electrical appliance is provided with electrodes (17) for detecting a state in which an electrical appliance such as a hair dryer is submerged in water. When the electrodes (17) are in a short-circuited state, relay means (3) is driven to open a contact (7). As a result, supply of the power supply voltage from a commercial power source (1) to the loads such as a motor (15), a heater (16) and the like is stopped so that an accident due to leakage can be prevented in such cases as a case in which the electrical appliance has been dropped into the water.

Abstract: An automated blood pressure monitoring instrument including a noise level detector which enables the instrument to have the sound sensing performance analogous to the human ear. Sounds, including Korotkoff sounds, emitted from the occluded artery of a subject person are transduced into corresponding electric signals to be fed through a filter to the said noise level detector. At the noise level detector, a noise level is calculated from the incoming signals in such a manner as to exclude from this calculation values of expected Korotkoff sound levels and the like which are normally thought to be much higher than an estimated or assumed level of noises associated with the body in the normal blood pressure measurement. The noise level thus detected will vary depending upon the conditions of a subject person as well as varies from person to person, and therefore acts as an effective reference for identifying the Korotkoff sounds.