Fluid-operated power tool

Abstract

A fluid-operated power tool has an engaging part including an engaging element for engaging and turning a threaded connector, and a drive part including a fluid-operated drive with a cylinder and a piston movable in the cylinder for turning the engaging element under the action of fluid admitted to the cylinder, the power drive part having a width which substantially does not exceed a width of the engaging part.

1. A fluid-operated tool, comprising an engaging part including an engaging element for engaging and turning a threaded connector; and a drive part including a fluid-operated drive with a cylinder and a piston movable in said cylinder under the action of fluid admitted into said cylinder for turning said engaging element, said cylinder having a substantially non-round inner chamber and a substantially non-round cross-section with an outer width which substantially does not exceed width of said engaging part and an outer length which exceeds said width of said cylinder, said piston being substantially non-round in correspondence with a non-round shape of said inner chamber and having a cross-sectional shape with a length which is grater than a width, so as to allow working with the fluid-operated power tool in a limited clearance area because of a smaller outer width of said cylinder than its length and at the same time to provide transmission of a high torque because of the greater length of said piston than its width. 
     
     
       2. A fluid-operated tool as defined in  claim 1 , wherein said cylinder has a peripheral wall with two side portions which are spaced from one another in direction of the width of said cylinder and which have a thickness which exceeds a thickness of a remaining portion of said peripheral wall, said side portions of said peripheral wall having convex projections extending into an interior of said cylinder, said piston having side walls which are spaced from one another in direction of the width and have concave recesses corresponding to said convex projections of said cylinder, so that said convex projections of said side portions of said peripheral wall of said cylinder extend into said concave recesses of said side walls of said piston. 
     
     
       3. A fluid-operated tool as defined in  claim 2 , wherein said piston has a groove and is provided with an O-ring, said O-ring having two opposite sides which are spaced from one another in direction of the width and have concave cavities corresponding to said convex projections of said side portions of said peripheral wall of said cylinder. 
     
     
       4. A fluid-operated tool as defined in  claim 2 , wherein said engaging element has an engaging portion arranged to engage a threaded connector, and another portion which is spaced from said engaging portion, said piston having a piston rod operatively connected with said other portion, so that during a displacement of said piston, said piston acts on said other portion and turns said engaging element, said other portion being provided with an arcuate surface while said piston rod is provided with a member pivotably mounted on said piston and having an arcuate surface cooperating with said arcuate surface of said other portion of said engaging element. 
     
     
       5. A fluid-operated tool as defined in  claim 1 , wherein said cross-section of said cylinder, said inner chamber of said cylinder and said cross-section of said piston are substantially oval.