초록 ▼

A combined locking mechanism and switch especially for power tools has a switch, an actuator for directly turning on or off the switch, a locking member shiftable between a first position in which it is disposed in opposed relation to the actuator and a second position in which it is spaced apart fo

A combined locking mechanism and switch especially for power tools has a switch, an actuator for directly turning on or off the switch, a locking member shiftable between a first position in which it is disposed in opposed relation to the actuator and a second position in which it is spaced apart form the actuator, and an actuating member for actuating the actuator through the locking member only when the locking member is placed in the first position.

대표청구항 ▼

A power tool comprising: a tool housing; an electric motor enclosed in said tool housing; a chuck projecting out of said tool housing; a torque transmission mechanism for transmitting torque from said electric motor to said chuck; an operating member mounted on said tool housing and adapted to be op

A power tool comprising: a tool housing; an electric motor enclosed in said tool housing; a chuck projecting out of said tool housing; a torque transmission mechanism for transmitting torque from said electric motor to said chuck; an operating member mounted on said tool housing and adapted to be operated by an operator; a switch having an actuator and connected to said electric motor so that when said actuator is in its own position, driving current may flow to said electric motor, and when said actuator is in its off position, driving current may not flow to said electric motor; an overload sensing member mechanically connected to said torque transmission mechanism, said overload sensing member being shiftable when torque above a predetermined level is produced between said electric motor and said chuck; a locking member mechanically connected to said overload sensing member, said locking member being normally in a first position in which said locking member is located in a path of movement of said actuator, said locking member being shiftable, as said overload sensing member is shifted, to a second position in which said locking member is located out of the path of movement of said actuator; and an actuating member disposed in opposing relation to said actuator with said locking member interposed therebetween, so that when said locking member is in the first position, said actuating member may be moved by operation of said operating member to shift said actuator to its on position through said locking member, and when said locking member is shifted to the second position, said locking member being disengaged from said actuator to cause said actuator to move to its off position.