Tightening and loosening tool in particular suitable for vertical bolts with threaded upper ends or hexagonal heads, comprising cage with rollers

摘要

The tool (1) is assembled of a cage with rollers accommodated inside the lower area (4) of a cylindrical housing (2). Three pairs of rollers are arranged around the center with slightly elastic bridges between them, acting on a hexagonal screw head or nut. A slightly curved recess is formed around each of the rollers along the inner surface of the housing (2), facilitating the creation of torque independent of the direction of motion.