Joining device between components of an item of furniture

A joining device between components of an item of furniture, comprising:

• a casing extending along a longitudinal axis between a first end to be received in a first seat in a first component of said item of furniture, and a second end to be received in a second seat in a second component of said item of furniture, said casing comprising a first portion and a second portion which are each radially expandable for engaging the first and second components of the item of furniture at the first seat and at the second seat, respectively;
• a tie-rod housed within the casing and axially slidable from a rest position, in which said first and second portions are radially retracted, to a locking position in which said first and second portions are radially expanded beyond dimensions of the casing in the rest position;
• said tie-rod having a first enlargement and a second enlargement respectively at said first and second portions to perform the radial expansion of said first and second portions;
• said tie-rod comprising a head arranged at one end of the tie-rod opposite the first and second enlargements;
• and
• a cam element housed in said casing to be rotatable with respect to the casing about an axis of rotation of the cam element while being fixed with respect to the casing along the longitudinal axis, the cam element operatively associated with an abutment portion of said tie-rod for axially moving the tie-rod from the rest position to the locking position and vice versa when said cam element is turned about the axis of rotation that is transverse with respect to an axis of the tie-rod;
• wherein said cam element includes a lobe along an outer periphery, which has a forward profile having a predefined extension about the axis of rotation to perform, alone, displacement of the tie-rod with respect to the casing from the rest position to the locking position to actuate expansion of both first and second portions with a single movement in a forward rotation direction of the cam element;
• said abutment portion of the tie-rod being arranged at said head and extending from said head to oppose the cam element for causing said displacement of the tie-rod;
• wherein the head of the tie-rod has a slot extending along the axis of the tie-rod and said cam element comprises a through pin passing through said slot;
• said through pin having a fixing end which is opposite to a remainder of the cam element;
• and the casing having a hole in which the fixing end is inserted;
• wherein the cam element comprises an upper cam element and a lower cam element, respectively arranged on opposite sides with respect to the head of the tie-rod and respectively connected to opposite ends of said through pin;
• said tie-rod comprising upper and lower abutment portions arranged on opposite sides of the head of the tie-rod to respectively engage the upper and lower cam elements.