Power tool attachment part

Abstract

An attachment part for tightening joints includes: an elongate housing including an upper housing part and a lower housing part, an input gear wheel for connection to an output shaft of a power wrench, arranged at a first end of the housing, an output gear wheel for connection to a joint to be tightened, arranged at a second end of the housing, and at least one intermediate gear wheel arranged inside the housing to transmit rotation of the input gear wheel to the output gear wheel, wherein each gear wheel has outer slanted teeth that connect the gear wheels and transmit said rotation there between.

1 - 12 . (canceled) 
     
     
         13 . An attachment part for tightening joints, comprising:
 an elongate housing including an upper housing part and an interconnected lower housing part,   an input gear wheel for connection to an output shaft of a power wrench, the input gear wheel arranged at a first end of the housing,   an output gear wheel for connection to a joint to be tightened, the output gear wheel arranged at a second end of the housing, and   at least one intermediate gear wheel, which is arranged inside the housing to transmit rotation of the input gear wheel to the output gear wheel, wherein each gear wheel has outer slanted teeth that connect the gear wheels and transmit rotation there between, wherein the at least one intermediate gear wheel comprises:   an upper race, which is arranged inside the at least one intermediate gear wheel and faces the upper housing part, wherein balls are arranged in said upper race at least partly inside the at least one intermediate gear wheel to support an upper part thereof with respect to the housing, and   a lower race, which is arranged inside the at least one intermediate gear wheel and faces the lower housing part, wherein balls are arranged in said lower race at least partly inside the at least one intermediate gear wheel to support a lower part thereof with respect to the housing,   wherein the balls in the upper and lower races are fully supported by upper and lower axial supports, respectively, the axial supports being connected to each other via an attachment piece that runs through a centre of the intermediate gear wheel, such that the upper and lower axial supports, balls and a gear wheel form a releasable gear package.   
     
     
         14 . The attachment part according to  claim 13 , wherein the upper and lower races are arranged at a position inside the at least one intermediate gear wheel that allows the entirety of the balls to fit inside the at least one intermediate gear wheel. 
     
     
         15 . The attachment part according to  claim 13 , wherein the attachment piece comprises a screw and wherein one of the axial supports has a threaded opening inside which a tip of the screw is to be screwed. 
     
     
         16 . The attachment part according to  claim 13 , wherein the upper and lower axial supports include a body portion that is arranged to be received in through holes in the upper and lower housing parts, respectively. 
     
     
         17 . The attachment part according to  claim 13 , wherein the output gear wheel is journalled inside the housing, by means of balls that are arranged between an upper and lower outer periphery of the output gear wheel and the respective housing part. 
     
     
         18 . The attachment part according to  claim 13 , wherein the attachment part includes at least two intermediate gear wheels. 
     
     
         19 . The attachment part according to  claim 18 , wherein the attachment part includes three intermediate gear wheels. 
     
     
         20 . The attachment part according to  claim 13 , wherein the upper and lower housing parts are held together by screws outside the intermediate gear wheel, and wherein there is a gap between the screws and one of the housing parts, such that there is an allowance inside which the upper and lower housing parts may slide with respect to each other.