Device for diffusing volatile substances

1 . A device for diffusing volatile substances that comprises:

a container which comprises:

an opening;

a reservoir containing a predetermined volume of a liquid volatile substance; and

a lower neck;

an upper closing element which closes the opening of the container and slides upwards and downwards across the neck; and

a wick which comprises an upper end and a lower end, wherein the lower protrudes into the liquid, while the upper end protrudes from the liquid and from the container;

being the device characterized in that:

the closing element further comprises at least one internal perimetral groove, and

the lower neck of the container further comprises a groove with no thread pitch, the groove with no thread pitch comprising a plurality of protrusions;

wherein the internal perimetral groove and the plurality of protrusions work together for an adjustment on a fixed pre-determined position of the upper closing element with regards to the container.

2 . The device for diffusing volatile substances according to claim 1 wherein the container and the closing element are mutually joint to each other by means of a correspondent closing thread.

3 . The device for diffusing volatile substances according to claim 1 wherein the closing element further comprises vertical internal ribs for structural reinforcement.

4 . The device for diffusing volatile substances according to claim 3 wherein the internal perimetral groove is made over the lower end of each rib, therefore being discontinuous.

5 . The device for diffusing volatile substances according to claim 1 wherein the closing element further comprises through holes.