Balancer for tools

A balancer for tools comprises:

• a rotary drum for winding and unwinding a cable, which is configured with a free end thereof to support a tool,
• a return spring, which is wound around the rotation axis of said drum and is coupled to said drum, for development of an elastic reaction that contrasts an unwinding of said cable and is adapted to facilitate a rewinding thereof,
• an adjustment assembly for adjusting a preloading of said return spring, for the selective variation of the intensity of said elastic reaction,
• wherein said adjustment assembly comprises:
• a fixed annular gear with an internal set of teeth,
• a substantially circular ring with an external set of teeth, arranged inside said annular gear in a substantially coplanar manner,
• a plate which is arranged substantially coplanar inside said circular ring and is free to rotate about the longitudinal axis of said annular gear by the action of a user,
• in every angular position of said plate said circular ring being kept pressed, with at least one respective said section of said external set of teeth, against said internal set of teeth by a corresponding active portion of said plate with a larger radial extension, with respect to said longitudinal axis, for a transmission of motion from said plate to said circular ring and a consequent adjustment of the preloading of said return spring, which is functionally connected to said circular ring.