Control device for ratchet wrench

Abstract

A ratchet wrench includes a head having a first through hole with a polygonal inner periphery to be engaged with an object and a second through hole which includes a first engaging inner periphery. A rod portion is movably received in the second through hole and has a flange which is removably engaged with the first engaging inner periphery. The cap member has a polygonal recess so as to be engaged with a first end of the rod portion so that the rod portion is co-rotated with the cap member. The cap member has an annular lip which has a second engaging outer periphery. An operation portion includes a connection recess to retain the cap member therein. By operating the rod portion or the cap member, the handle can be selectively rotated freely or co-rotated with the head.

1 . A ratchet wrench comprising: 
 a head having an engaging portion which includes a first through hole with a polygonal inner periphery which is adapted to be engaged with an object and a second through hole which includes a first engaging inner periphery, a bottom plate with a central hole engaged with the second through hole;    a movable member composed of a cap member and a rod portion, the rod portion movably received in the second through hole and having a flange that has a first engaging outer periphery which is removably engaged with the first engaging inner periphery, the rod portion including a first end and a second end, the second end movably extending through the central hole of the bottom plate, the cap member having a polygonal recess and the first end of the rod portion being movably engaged with the polygonal recess so that the rod portion is co-rotated with the cap member, the cap member having an annular lip which has a second engaging outer periphery, and    an operation portion including a handle and a mounting portion, a connection recess defined in an underside of the mounting portion and a top hole which communicates with the connection recess, the top hole including an inward flange so as to stop the annular lip of the cap member, the connection recess having a second engaging inner periphery and the second engaging outer periphery of the cap member removably engaged with the second engaging inner periphery.    
     
     
         2 . The wrench as claimed in  claim 1 , wherein the central hole of the bottom plate is a sink hole and the second end of the rod portion is movably received in the sink hole and does not extend beyond an underside of the bottom plate.  
     
     
         3 . The wrench as claimed in  claim 1 , wherein a spring is mounted to the rod portion and biased between the annular lip of the cap member and a top surface of the flange of the rod portion.