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1. (WO2017001422) JOINING DEVICE, PARTICULARLY FOR JOINING A SHELF TO A WALL OF A PIECE OF FURNITURE
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CLAIMS

1. A joining device (1), associable with a shelf (2) that can be arranged against a wall (3) of a piece of furniture, comprising a cylindrical body (4) that can be associated in a first hole (5) adapted to be provided transversely in said shelf (2) and provided with a first axial seat (8) for the rotatable coupling of the first stem (9) of a screw (10) provided with a first crown-shaped head (11) that can be arranged rotatably within a second seat (12) that is adjacent to said first seat (8), characterized in that it comprises an insert (37) accommodated within a second hole (28) adapted to be provided in said shelf (2) at right angles to said first hole (5), said insert (37) being arranged substantially flush with or below the upper surface (29) of said shelf (2), said insert (37) being provided axially with a seventh through seat (38) that is axially aligned with the central axis of said insert (37) so as to arrange itself along the same axis as a third seat or hole (18), provided in said cylindrical body (4), adapted for the rotatable coupling of a second head (22) of a pinion (21) that interacts with said first crown-shaped head (11), a second stem (20) of said pinion (21) being arrangeable temporarily in said seventh seat (38), said second head (22) thereof protruding outside said cylindrical body (4), being accommodated rotatably within said seventh seat (38) of said insert (37) and being adapted to mate kinematically with said first head (1 1) accommodated within said second seat (12).

2. The joining device according to claim 1, characterized in that said insert (37) has a substantially cylindrical shape and has a height that is equal to, or substantially lower than, the distance that lies, once said joining device (1) has been assembled, between said upper surface (29) of said shelf (2) and the outer lateral surface (19) of said cylindrical body (4), said insert (37), when installed, resting on said first head (11) of said screw (10) while remaining substantially flush with said shelf (2).

3. The joining device according to claims 1 or 2, characterized in that said insert (37) has a first wing (40) that protrudes from it downward at said seventh seat (38) and is extended radially at the part of said seventh seat (38) that contains said second stem (20) of said pinion (21), said first wing (40) having a lower free end (54) that is located at a fifth hole (46) provided in said cylindrical body (4).

4. The joining device according to one or more of the preceding claims, characterized in that the flat lateral surface (53) of said first wing (40) directed toward said first head (11) of said screw (10) is partially hollow so as to obtain a ninth seat (42) that is shaped complementarity to said second stem (20) of said pinion (21), the rotatable and temporary interconnection of said second stem (20) with said insert (37) occurring by way of the presence of an annular groove (23), which is provided proximate to its end and interacts selectively with an annular ridge (58) that protrudes from said ninth seat (42) provided on said first wing (40).

5. The joining device according to one or more of the preceding claims, characterized in that the extraction prevention or bolt function is provided by the presence of said insert (37), which locks said cylindrical body (4) with respect to said shelf (2), since said second head (22) is accommodated within said eighth seat (38) and said insert (37) is inserted within said second hole (28) adapted to be provided in said shelf (2).

6. The joining device according to one or more of the preceding claims, characterized in that said cylindrical body (4) is composed of a single shell (6) that is substantially cylindrical and internally hollow and on the inner lateral surface (51) of which, defined at said first seat (8), said first stem (9) rests rotatably, proximate to the part of said first stem (9) that protrudes from said first head (11) of said screw (10) there being an annular recess (44) that interacts with an annular ridge or tooth (52) that is adapted to block the axial sliding of said screw (10).

7. The joining device according to one or more of the preceding claims, characterized in that said third seat or hole (18) is provided on said outer lateral surface (19) of said first shell (6), at right angles to the axis of said first and second seats (8, 12) and to the axis of said first stem (9), and it is possible to arrange therein temporarily said second stem (20) of said pinion (21) provided with said second head (22) that protrudes externally to said cylindrical body (4) and is adapted to couple kinematically to said first head (11) accommodated in said second seat (12).

8. The joining device according to one or more of the preceding claims, characterized in that means for the engagement of a pressure tool are provided on the second upper end (30) of said second head (22) of said pinion (21) and are constituted by a fifth seat (31) within which a tool can be arranged by pressing.

9. The joining device according to one or more of the preceding claims, characterized in that a third hole (32) is provided transversely in said wall (3) for the interconnection of the third end (34) of said first stem (9) of said screw (10), said first stem (9) being provided with a thread for chipboard or being associable with a bushing (33) arranged within said third hole (32).

10. The joining device according to one or more of the preceding claims, characterized in that said seventh seat (38), provided in said insert (37), and said ninth seat (42), provided in said flat lateral surface (53) of said first wing (40), are arranged along the same axis and are axially offset with respect to both the central axis of said insert (37) and the axis of said third seat or hole (18), so as to be inclined and form an acute angle, considering a counterclockwise rotation as positive, with respect to the plane of arrangement of said upper surface (29) of said shelf (2), said ninth seat (42) being shaped complementarily to the second stem (20) of the pinion (21), which can be coupled rotatably to said first crown-shaped head (11).