Electric hand tool

Abstract

An electric hand tool includes a housing, which houses a driving mechanism and a chuck for driving a bit, a battery pack for providing electricity to the driving mechanism, and a switch unit installed in the housing. The switch unit has a switch, an operating member for switching on/off the switch to control supply of electricity from the battery pack to the driving mechanism, and a switching lever extended out of a through hole in the rear portion of the housing and forming a switching portion for operation by the thumb of the hand holding the housing to drive the switching lever to change the direction of electric current and to further reverse the direction of rotation of the driving mechanism.

1 . An electric hand tool comprising: 
 a housing having a front portion provided with an opening, and a rear portion;    a driving mechanism installed in said housing;    a chuck coupled to said driving mechanism and extending out of the opening of said housing to hold a bit for turning by said driving mechanism;    a battery pack for providing electricity to said driving mechanism; and    a switch unit installed in said housing, said switch unit having a switch, an operating member connected to said switch for switching on/off said switch to control supply of electricity from said battery pack to said driving mechanism, and a switching lever for driving said switch to change the direction of electric current provided by said battery pack, said switching lever having a switching portion at one end thereof;    wherein said rear portion of said housing has a through hole through which said switching portion of said switching lever extends for operation by a user; and    wherein said switching lever has a first end pivoted to said switch and a second end forming said switching portion.    
     
     
         2 . The electric hand tool as claimed in  claim 1 , wherein said switching lever comprises a first link having a first end pivoted to said switch and a second end, and a second link having a first end pivoted to the second end of said first link and a second end forming said switching portion.  
     
     
         3 . (canceled)  
     
     
         4 . The electric hand tool as claimed in  claim 1 , wherein said switching portion has an indication zone for indicating the direction of rotation of the chuck.