Patent ID: 9533402
Date: 2017-01-03
CPC Classifications: B25B

Claim:
1. A hydraulically operated tightening tool comprising: a body comprising a hydraulic cylinder, the hydraulic cylinder comprising a piston, the piston comprising a head, wherein first and second tabs protrude from the head of the piston, wherein the first tab comprises a first arched groove, wherein the second tab comprises a second arched groove, the first and second arched grooves being transverse and facing each other, the first and second arched grooves opening at respective end sections through respective longitudinal edges of the first and second tabs, the piston having a first, retracted, position and a second, extended, position; an actuating ring for a threaded element, the actuating ring being articulated with respect to the body and adapted to receive an action of the piston of the hydraulic cylinder a spring having a first end and a second end, and an elastically variable length the spring being disposed in a manner to traverse the actuating ring perpendicularly first and second elements disposed respectively at first and second ends of the spring, wherein the first element protrudes from a first end of the actuating ring and fits in the first arched groove, wherein the second element protrudes from a second end of the actuating ring and fits in the second arched groove; wherein the actuating ring is articulated via the spring, the first element, and the second element; and a thrusting part disposed between the first and second tabs, the thrusting part resting on the piston of the hydraulic cylinder, wherein the actuating ring rests on the thrusting part wherein: