Fluid-operated power tool

Abstract

A fluid-operated power tool has an engaging part with a turnable engaging element for engaging and turning a threaded connector, and a power drive part with a power drive operative for turning the engaging part, wherein the power drive part includes a fluid-operated cylinder-piston unit, the power drive part having an end spaced from the engaging part and provided with an inner opening with a first connection, and a reaction member formed as a reaction arm which is turnable between a plurality of positions around an axis of the power drive part and fixable in each of the positions, the reaction arms having a projection which is insertable in the opening and being provided with second connection with the first connection so as to connect the reaction arm with the power drive part.

1. A fluid-operated power tool, comprising an engaging part with a turnable engaging element for engaging and turning a threaded connector, and a power drive part with a power drive operative for turning the engaging part, wherein the power drive part includes a fluid-operated cylinder-piston unit, said power drive part having an end spaced from said engaging part and provided with an inner opening with first connecting means, and a reaction member formed as a reaction arm which is turnable between a plurality of positions around an axis of said power drive part and fixable in each of said positions, said reaction arms having a projection which is insertable in said opening and being provided with second connecting means cooperating with said first connecting means so as to connect said reaction arm with said power drive part. 
     
     
       2. A fluid-power tool as defined in  claim 1 , wherein said first connecting means are formed as a plurality of inner splines, said second connecting means being formed as a plurality of outer splines. 
     
     
       3. A fluid-power tool as defined in  claim 1 , wherein said cylinder-piston unit has an axis, said opening and said projection having axes which coincide with one another and with said axis of said cylinder-piston unit. 
     
     
       4. A fluid-power tool as defined in  claim 1 , and further comprising guide means provided in said power drive part, said projection with said second connecting means being guided on said guide means. 
     
     
       5. A fluid-power tool as defined in  claim 4 , wherein said power drive part has an open end, said guide means being formed as an end cap closing said open end. 
     
     
       6. A fluid-power tool as defined in  claim 5 , wherein said projection with said second connecting means has an inner opening and is fitted with said inner opening on said end cap. 
     
     
       7. A fluid-power tool as defined in  claim 6 ; and further comprising means for locking said reaction arm on said end cap and unlocking said reaction arm from said end cap, said locking end and locking means including a depression formed in said end cap, a slider movable in said reaction arm and engageable in said depression as well as disengageable from said depression, and a button operatable by a user for moving said slider into said depression and releasing said slider from said depression. 
     
     
       8. A fluid-power tool as defined in  claim 7 ; and further comprising spring means which bias said button so as to move said slider into said depression for locking.