Actuation and blocking system of a joint between a shoulder and a shelf of a piece of furniture or other furnishing items

An actuation and blocking system of a joint configured for joining a shoulder and a shelf, base or top of a piece of furniture or other furnishing item perpendicularly to each other, said actuation and blocking system comprising:

• a pin having a fixing element shaped as a threaded end configured to be received in the shoulder, wherein the pin is configured to be at least partially inserted in a hole defined in the shelf, base or top, the pin comprising a casing that houses a first stem coupled to a first pinion-toothed crown bevel gear assembly that defines a first 90° transmission, the first pinion-toothed crown bevel gear assembly comprising a first pinion and a first toothed crown bevel gear having longitudinal axes arranged perpendicularly to define the first 90° transmission, which operates as a kinematic adjustment mechanism for rotating the threaded end of the pin;
• and
• an actuation and blocking group of the joint arranged perpendicularly to the pin and comprising:
• a second stem adapted to be inserted into a side hole of said casing, said second stem extending from the actuation and blocking group, wherein a shaped end of the second stem is configured to be received in the first 90° transmission;
• and
• a second 90° transmission between a maneuvering point, which is configured to be accessible from a front of the piece of furniture and said second stem,
• wherein the second 90° transmission is defined by a second pinion-toothed crown bevel gear assembly that comprises a second pinion and a second toothed crown bevel gear having longitudinal axes arranged perpendicularly to one another, and
• wherein retention elements are provided between said pin and said actuation and blocking group, the retention elements being configured to engage the pin to the actuation and blocking group.