Combination drill

Abstract

A clutch bypass for a combination drill has a gearbox connected to a motor and an output spindle. The gearbox includes a ring gear. A washer is mounted adjacent the output spindle and a clutch mechanism is coupled with the gearbox to selectively transmit torque from the motor to the output spindle. The clutch mechanism includes at least one link member disposed between the washer and the ring gear and a blocking member disposed adjacent the washer for selectively engaging the washer. The blocking member has a first position in which the blocking member engages the washer, and a second position in which the blocking member does not engage the washer.

1 . A combination drill comprising: 
 a gearbox connected to a motor and an output spindle and including a ring gear;    a washer mounted adjacent said output spindle; and    a clutch mechanism coupled with said gearbox to selectively transmit a torque from said motor to said output spindle, said clutch mechanism including: 
 at least one link member disposed between said washer and said ring gear and  
 a blocking member disposed adjacent said washer for selectively engaging said washer, said blocking member having a first position in which said blocking member engages said washer, and a second position in which said blocking member does not engage said washer.  
   
   
   
       2 . The combination drill of  claim 1  further comprising a torque adjustment mechanism including a spring seat mounted coaxially with said washer, a torque adjustment ring rotatably mounted on said spring seat for causing the spring seat to move in an axial direction, and a spring disposed between said washer and said spring seat for exerting a biasing force against said at least one link members in said second position, whereby rotation of said torque adjustment ring moves said spring seat in an axial direction to vary said biasing force.  
   
   
       3 . The combination drill of  claim 1  further comprising a hammer mechanism including a first ratchet non-rotatably mounted in a gearbox housing and spaced apart in said first and second positions from a second ratchet fixedly mounted on said output spindle, and a hammer mode selector mounted on said gearbox housing and having a third position in which said second ratchet member is made engageable with said first ratchet member to generate a reciprocating motion of said output spindle in said first position of said blocking member.  
   
   
       4 . The combination drill of  claim 1 , wherein said blocking member includes a push pin, whereby said push pin abuts said washer when said push pin is manually depressed in front of said washer for axially engaging said washer.  
   
   
       5 . The combination drill of  claim 4 , wherein said clutch mechanism further comprises a return spring mounted on said push pin for urging said push pin away from said washer.  
   
   
       6 . The combination drill of  claim 1 , wherein said blocking member includes a blocking ring rotatably mounted on said washer, said blocking ring including a projection formed thereon extending in front of said washer for axially engaging said washer.