Device for joining of parts of furniture and furnishing accessories

1. A joining device for parts of furniture and furnishing accessories, shelf units, bookcases, drawer units, bed frames, or seating types, the joining device comprising:

a casing suitable for being inserted in a seat formed in a first of two components of an item of furniture to be joined;

an expansion bushing externally projecting with respect to a first end of said casing and suitable for engaging with a further seat of a second component of the item of furniture to be joined to the first component wherein the casing is inserted; and

a cam mechanism for a linear motion of an actuation means co-operating in an expansion and retraction deformation movement of the expansion bushing and simultaneous expansion of at least one portion of said casing with said cam mechanism and actuation means housed in the casing and configured to be actuated by a tool;

wherein said actuation means comprise a slider, driven in translation by said cam mechanism, to which slider said expansion bushing is made integral, co-operating with a wedge-shaped protuberance of the casing for its simultaneous expansion and retraction movement, said slider having a wedge-shaped rear part for expansion of said at least one portion of said casing follows its linear movement; and

wherein said expansion bushing has a substantially cylindrical shank in which a slot is formed, apt to be engaged by a protuberance of the slider, a pair of lateral wings being projected at the front from said shank, distanced so as to define an empty space apt to receive said protuberance of the casing, respective thickened portions with outer teeth being provided frontally to the wings.

2. The joining device according to claim 1 , wherein the cam mechanism comprises a central section with cam profile, apt to house in a seat of the slider and to come into contact with axially opposed shoulders of the slider.

3. The joining device according to claim 2 , wherein said cam mechanism comprises a seat, through and shaped to allow the introduction of the tool apt to actuate the rotation of said cam mechanism.

4. The joining device according to claim 1 , wherein respective flexible tabs are provided on said wings of the expandable bushing.

5. The joining device according to claim 2 , wherein the casing comprises a first half-shell and a second half-shell, each having a respective through opening, formed in a perpendicular direction to the longitudinal axis of said half-shells and coaxial with a slot of the slider provided in said seat, said holes being suitable for housing, respectively, an upper section and a lower section of the cam mechanism and for supporting the rotation of said cam mechanism.

6. The joining device according to claim 5 , wherein said second half-shell has side walls with a circular shaped profile with a window for the housing of opposite lateral protuberances provided at the sides of said slot of the slider.

7. A method of joining of parts of modular furniture or furnishing accessories by means of the joining device according to claim 1 , wherein the method comprises the steps of:

inserting the joining device in a groove or pocket formed in the thickness of one of the components to be joined, with the front portion of the bushing projecting externally to said groove or pocket and inserted in a further pocket formed in the thickness of the other component to be joined;

rotationally actuating the cam mechanism to exert a thrust action on the slider to impose an expansion and retraction of the bushing to exert an action of radial pressure and of traction on the lateral surface of said groove or pocket and simultaneous expansion of said at least one portion of the casing.

8. A joining device for parts of furniture and furnishing accessories, shelf units, bookcases, drawer units, bed frames, or seating types, the joining device comprising:

a container body suitable for being inserted in a seat formed in a first of two components of an item of furniture to be joined;

an expansion bushing externally projecting with respect to a front end of said container body and suitable for engaging with a further seat of a second component of the item of furniture to be joined to the first component wherein the container body is inserted; and

a cam mechanism for a linear motion of an actuation means co-operating in an expansion and retraction deformation movement of the expansion bushing and simultaneous expansion of at least one portion of said container body, with said cam mechanism and actuation means housed in the container body and configured to be actuated by a tool;

wherein said actuation means comprise a slider, driven in translation by said cam mechanism, to which slider said expansion bushing is made integral, co-operating with a wedge-shaped protuberance of the container body for its simultaneous expansion and retraction movement, said slider having a wedge-shaped rear part for expansion of said at least one portion of said container body following its linear movement;

wherein the cam mechanism comprises a central section with cam profile, apt to house in a seat of the slider and to come into contact with axially opposed shoulders of the slider;

wherein the container body comprises a first half-shell and a second half-shell, each having a respective through hole, formed in a perpendicular direction to the longitudinal axis of said half-shells and coaxial with a slot of the slider provided in said seat, said holes being suitable for housing, respectively, an upper section and a lower section of the cam mechanism and for supporting the rotation of said cam mechanism; and

wherein said second half-shell has side walls with a circular profile with a window for the housing of opposite lateral protuberances provided at the sides of said slot of the slider.