Ratchet pipe enlarging tool

Abstract

A pipe enlarging tool includes a ratchet mechanism that includes a base securely connected to the threaded rod that has a cone member to enlarge pipes clamped by a chuck assembly in the base of the tool. A ratchet is pivotably connected to the cap and selectively engaged with the toothed inner periphery of the handle which is rotatably mounted to the cap. A knob includes a positioning assembly which biases the ratchet to push one of two toothed ends of the ratchet to engage with the toothed inner periphery of the handle. The handle can be reciprocally operated by the ratchet mechanism to move the threaded rod to enlarge the pipe or to remove the cone member from the pipe.

1 . A pipe enlarging tool comprising: 
 a base having a head on a top thereof and a space defined in an underside of the base, a chuck assembly received in the space and an adjusting rod threadedly extending through a radial threaded hole in the base and contacting the chuck assembly;    a first threaded rod extending into the base from the top of the base and a lower end of the first threaded rod extending into the space, a top plate connected to a top end of the first threaded rod, a second threaded rod threadedly extending through a threaded passage defined axially in the first threaded rod, a cone member eccentrically connected to a lower end of the second threaded rod, and    a ratchet mechanism including a handle, a cap and a knob, the cap rested on the top plate and fixedly connected to the second threaded rod, the cap having a central passage and a slot defined radially through a wall of the cap and communicating with the central passage, a ratchet pivotably retained in the slot and having two toothed ends, the handle having a hole so as to be rotatably mounted to the cap and a toothed inner periphery defined in an inner periphery of the hole of the handle, the knob rotatably engaged with the hole in the handle and having a post which extends into the central passage, a stopper connected to a lower end of the post to prevent the post from disengaging from the cap, a recess defined radially in the post and a first positioning assembly received in the recess, the first positioning assembly biasing the ratchet to push one of the two toothed ends to engage with the toothed inner periphery of the handle.    
   
   
       2 . The tool as claimed in  claim 1 , wherein the first positioning assembly includes a first spring and a first bead which partially extends out from the recess and contacts the ratchet.  
   
   
       3 . The tool as claimed in  claim 1 , wherein the cap includes a radial pin hole and a pin extends through the pin hole and a through hole defined radially through the second threaded rod.  
   
   
       4 . The tool as claimed in  claim 1 , wherein the cap includes a top hole defined in a top thereof and a pin extends through the top hole and a hole in a center of the ratchet.  
   
   
       5 . The tool as claimed in  claim 1 , wherein the cap has a receiving hole defined in an underside thereof and a second positioning assembly is received in the receiving hole, the second positioning assembly includes a second spring and a second bead which is biased by the second spring and partially extends out from the receiving hole, the second bead engaged with a notch defined in a top of the top plate.  
   
   
       6 . The tool as claimed in  claim 1 , wherein the cap includes an opening defined in an outer periphery thereof and the knob  4  has a lever which is movably engaged with the opening.