Patent ID: 7051913
Filing Date: 2006-05-30
Classification: B25C

Abstract:
1. A safety control circuit for a direct current electromotive nail driver comprising: a direct current power source for supplying power to the circuit; a control and protecting unit having a security switch, a trigger switch and a stop switch; and a motor for driving an impact rod to compress an elastomer; wherein when the security switch is turned on and then the trigger switch is pressed, the control and protecting unit will receive a signal from the trigger switch so as to conduct the motor; when the motor operates through a predetermined time period, the stop switch will actuates to induce a protection function of the control and protecting unit so that the motor can not operate until the security switch is actuated again; wherein the control and protecting unit has a single chip controller for actuating and de-actuating the trigger switch and the stop switch, wherein control and protecting unit has two optical coupling and two metal-oxide-semiconductor field effect transistors for actuating and de-actuating the motor.