Abstract: This invention disclosed a power tool comprising housing, motor in the housing, switch fixed on the housing used to connect motor and power, output shaft connecting with operator and rotating in single direction in company with the motor driving, and locking device contained in the housing. Power tool has self-locking mechanism which can lock the output shaft no need additional tools or holding force. The locking act can be easier and safer.

Abstract: The present invention has disclosed a variable speed tool and a variable speed control method. The tool includes a switch; a gearbox housing; a motor; an outputting shaft; a multistage transmitting gear train and a gearshift ring which are mated with the motor and the outputting shaft, the gearshift ring having inner teeth; a gearshift fork mated with the gearshift ring; a tension spring arranged between the gearbox housing and the gearshift fork; and a torque sensing ring provided with a sliding groove in which the gearshift fork is movably disposed. When the load of the outputting shaft has reached to a predetermined value, the torque sensing ring makes the gearshift fork move axially in the sliding groove under the action of the tension spring, thus bringing the gearshift ring to move axially. The variable speed tool of the present invention may automatically adjust the rotating speed and the torque of the outputting shaft according to a variation of the load torque.

Abstract: A power tool comprising a housing, a motor, an output shaft, a gear transmission mechanism and a control system. The gear transmission mechanism is connected between the motor and the output shaft to transmit the rotary power of the motor to the output shaft. The gear transmission mechanism has a high speed position and a low speed position. The control system is coupled to the gear transmission mechanism for detecting an operating characteristic of the power tool to actuate a ring gear to automatically move from the high speed position to the low speed position and to reduce the rotational speed of the ring gear when the operating characteristic exceeding a predetermined value.

Abstract: A power tool includes a housing, a motor, an output shaft, a gear transmission mechanism and a control system. The gear transmission mechanism is connected between the motor and the output shaft to transmit the rotary power of the motor to the output shaft. The power tool includes a signal generator and a control system electrically coupled to the signal generator and operatively engaged with the gear transmission mechanism such that when the signal generator is manually activated, an electric signal is generated and transmitted to the control system to cause the gear transmission mechanism to vary the gear reduction ratio.

Abstract: This invention disclosed a power tool comprising housing, motor in the housing, switch fixed on the housing used to connect motor and power, output shaft connecting with operator and rotating in single direction in company with the motor driving, and locking device contained in the housing. Power tool has self-locking mechanism which can lock the output shaft no need additional tools or holding force. The locking act can be easier and safer.

Abstract: The present invention has disclosed a variable speed tool and a variable speed control method. The tool includes a switch; a gearbox housing; a motor; an outputting shaft; a multistage transmitting gear train and a gearshift ring which are mated with the motor and the outputting shaft, the gearshift ring having inner teeth; a gearshift fork mated with the gearshift ring; a tension spring arranged between the gearbox housing and the gearshift fork; and a torque sensing ring provided with a sliding groove in which the gearshift fork is movably disposed. When the load of the outputting shaft has reached to a predetermined value, the torque sensing ring makes the gearshift fork move axially in the sliding groove under the action of the tension spring, thus bringing the gearshift ring to move axially. The variable speed tool of the present invention may automatically adjust the rotating speed and the torque of the outputting shaft according to a variation of the load torque.

Abstract: A power tool comprising a housing, a motor, an output shaft, a gear transmission mechanism and a control system. The gear transmission mechanism is connected between the motor and the output shaft to transmit the rotary power of the motor to the output shaft. The gear transmission mechanism has a high speed position and a low speed position. The control system is coupled to the gear transmission mechanism for detecting an operating characteristic of the power tool to actuate a ring gear to automatically move from the high speed position to the low speed position and to reduce the rotational speed of the ring gear when the operating characteristic exceeding a predetermined value.

Abstract: A power tool comprising a housing, a motor, an output shaft, a gear transmission mechanism and a control system. The gear transmission mechanism is connected between the motor and the output shaft to transmit the rotary power of the motor to the output shaft. The power tool comprises a signal generator and a control system electrically coupled to the signal generator and operatively engaged with the gear transmission mechanism such that when the signal generator is manually activated, an electric signal is generated and transmitted to the control system to cause the gear transmission mechanism to vary the gear reduction ratio.

Abstract: The present invention relates to a dual plate sander comprising a housing, a motor mounted in the housing, first and second transmission devices driven by the motor and eccentric shafts each rotating about a main drive shaft connected to the transmission device. Twin sanding assemblies terminating in sanding plates are mounted on respective eccentric shafts. A guiding element serves to translate the eccentric rotary motion of the eccentric shafts into opposite reciprocating movement of the sanding assemblies. The opposed reciprocating movement serves to balance the inertial forces generated by the sander and reduce oscillations.

Abstract: The present invention relates to a dual plate sander comprising a housing, a motor mounted in the housing, first and second transmission devices driven by the motor and eccentric shafts each rotating about a main drive shaft connected to the transmission device. Twin sanding assemblies terminating in sanding plates are mounted on respective eccentric shafts. A guiding element serves to translate the eccentric rotary motion of the eccentric shafts into opposite reciprocating movement of the sanding assemblies. The opposed reciprocating movement serves to balance the inertial forces generated by the sander and reduce oscillations.