RAILROAD NUT WRENCH Russian patent published in 2007 - IPC B25B21/02 E01B29/28 

FIELD: machine engineering.

SUBSTANCE: railroad nut wrench includes hydraulic motor with output shaft and lid having ducts for supplying and removing working liquid. Said ducts are communicated with turnings three-way hydraulic distributor having spring-loaded spool, percussion-pulse rotation mechanism, housing and frame-handle with control mechanism. Frame-handle is in the form of two semicircular (left and right) handles. Control mechanism is in the form of two spring-loaded levers. Each lever is mounted in strut and provided with cam engaging with end of spool of three-way hydraulic distributor. Difference of maximum radiuses of cams provides working stroke of spool to opening and closing sides. One cam is mounted with possibility of holding spool in mean position and releasing it; second cam is mounted with possibility of moving spool against action of spring force.

EFFECT: enhanced efficiency and comfort of using nut wrench.

1 dwg