Torque wrench with variable-arm clicker mechanism

A Torque wrench (40) with a variable-arm clicker mechanism, comprising a substantially tubular body (41), equipped with a handgrip (18) from which protrudes a ratchet gear element (4) to engage a blocking device (14) which must be tightened, wherein inside said tubular body (41) is said variable-arm clicker mechanism, said variable-arm clicker mechanism comprising a main lever (2) having a first end and a second end and having on said first end said ratchet gear element (4) and on said second end a T shaped element (5), said main lever (2) being mounted on said tubular body (41) by means of a first pin (3), wherein said variable-arm clicker mechanism has a pair of parallel intermediate levers (6), hinged on a fulcrum (10), which is integral with a movable carriage (9), said parallel intermediate levers (6) being extended within said movable carriage (9) through a pair of slots (31, 32) and being connected by means of a second pin (12) to a pair of small levers (22) hinged by a third pin (21) onto a roller (15) which acts on a push rod (20) to operate a resilient means (16).