Thread repair tool

Abstract

A thread repair tool for repairing damaged threads on a screw is disclosed. The thread repair tool includes a tool body and plural rollers. The tool body has at least one surface provided with a thread repair blade that has a tooth pitch identical to a thread pitch of the threads to be repaired. The rollers are separated from the tool body by a gap. The thread repair tool further includes an adjusting means for adjusting the gap so as to hold the screw between the tool body and the rollers.

What is claimed is: 
     
         1 . A thread repair tool, for repairing a set of threads on a screw, the thread repair tool comprising:
 a tool body having at least one surface provided with a thread repair blade that includes a row of teeth and has a tooth pitch identical to a thread pitch of the set of threads;   a plurality of rollers being separated from the tool body by a gap; and   an adjusting means for adjusting the gap so as to hold the screw between the tool body and the rollers.   
     
     
         2 . The thread repair tool of  claim 1 , wherein the adjusting means comprises a base, an adjusting screw and a sliding block, the base having a lengthwise sliding guide, the rollers being rotatably mounted on the base, the tool body being fixed to the sliding block, the sliding block being slidably mounted on the sliding guide so the sliding block is allowed to linearly slide in a sliding direction, the sliding block having a threaded hole, and the adjusting screw being rotatably independent of the base and then engaging with the threaded hole, whereby rotation of the adjusting screw makes the sliding block slide along the sliding guide. 
     
     
         3 . The thread repair tool of  claim 1 , wherein the adjusting means comprises a base, an adjusting screw and a sliding block, the base having a lengthwise sliding guide and a threaded hole, the rollers being rotatably mounted on the sliding block, the sliding block being slidably mounted on the sliding guide so the sliding block is allowed to linearly slide in a sliding direction, a position of the tool body related to the base being fixed, and the adjusting screw engaging with and passing through the threaded hole so that a free end thereof is connected to the sliding block, whereby rotation of the adjusting screw makes the sliding block slide along the sliding guide. 
     
     
         4 . The thread repair tool of  claim 1 , wherein the tool body is a polygonal plank having each lateral surface thereof provided with one said thread repair blade and the thread repair blades on the different lateral surfaces of the polygonal plank have different thread pitches. 
     
     
         5 . The thread repair tool of  claim 1 , wherein the rollers coming in pair are arranged abreast to jointly define a supporting area facing the tool body for the screw to lean thereon.