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 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 adjacent the ring gear and a rotatable mode selector disposed adjacent the link member. The mode selector has at least one opening that can receive a bypass member. The mode selector has a first position in which the bypass member does not abut the link member, and a second position in which the bypass member abuts the link member.

1 . A combination drill comprising: 
 a gearbox connected to a motor and an output spindle and including a ring gear;    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 adjacent said ring gear and  
 a mode selector disposed adjacent said at least one link member, said mode selector having at least one opening formed thereon for receiving a bypass member therein, said mode selector further having a first position in which said bypass member does not abut said at least one link member, and a second position in which said bypass member abuts said at least one link member.  
   
   
   
       2 . The combination drill of  claim 1  further comprising a torque adjustment mechanism including a washer disposed adjacent said mode selector, 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 member 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, wherein said mode selector further has a third position in which said bypass member is rotated away from said at least one link member and said second ratchet member is positioned to engage said first ratchet member to generate a reciprocating motion of said output spindle.  
   
   
       4 . The combination drill of  claim 1 , wherein said gearbox includes a first planetary gear set and a second planetary gear set for transmitting rotation of said motor and reducing the speed of said motor.  
   
   
       5 . The combination drill of  claim 4 , wherein said gearbox further includes a third planetary gear set having said ring gear rotatably disposed therein.  
   
   
       6 . The combination drill of  claim 1 , wherein said gearbox further has at least one opening formed circumferentially thereon for receiving said at least one link member, and said ring gear includes at least one protrusion formed circumferentially thereon for engaging said at least one link member to selectively rotatably fix said ring gear.  
   
   
       7 . 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.  
   
   
   
       8 . The combination drill of  claim 7  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.  
   
   
       9 . The combination drill of  claim 7  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.  
   
   
       10 . The combination drill of  claim 7 , 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.  
   
   
       11 . The combination drill of  claim 10 , wherein said clutch mechanism further comprises a return spring mounted on said push pin for urging said push pin away from said washer.  
   
   
       12 . The combination drill of  claim 7 , 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.  
   
   
       13 . A combination drill comprising: 
 a gearbox connected to a motor and an output spindle and including a ring gear; 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 adjacent said ring gear, said at least one link member having a slot, and  
 a capture member disposed adjacent said at least one link member for selectively engaging said at least one link member, said capture member having a first position in which said capture member is at least partially received in said slot, and a second position in which said capture member does not engage said at least one link member.  
   
   
   
       14 . The combination drill of  claim 13  further comprising a torque adjustment mechanism including a washer mounted over said output spindle adjacent said at least one link member, 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.  
   
   
       15 . The combination drill of  claim 13  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.  
   
   
       16 . The combination drill of  claim 13 , wherein said at least one link member includes a pin having an end portion that defines a circumferential groove.  
   
   
       17 . The combination drill of  claim 16 , wherein said capture member includes a push-button having at least one bracket for engaging said at least one link member in said slot.  
   
   
       18 . The combination drill of  claim 16 , wherein said capture member includes a ring that defines an arced opening for receiving said at least one link member, said arced opening having a tapered portion for engaging said at least one link member in said slot.  
   
   
       19 . The combination drill of  claim 13 , wherein said slot includes an end portion that defines a through hole and said capture member includes a pin that is received in said through-hole for engaging said at least one link member.