Device for varying the length of a strap on a mask for aquatic activities

1. A device for varying the length of strap on a mask for aquatic activities, the mask comprising a frame for supporting a lens and a plurality of fork-shaped portions extending from either side of the frame, each portion having a pivot about which a portion of the strap end is wrapped, the strap portion having a plurality of transverse stop ribs on one side, wherein the device includes a stop lever housed in each of the fork-shaped portions and a tooth extending from the lever for engaging one of the ribs, the lever having a substantially U-shaped member and a tongue extending from the base of the member such that the tongue is coplanar with and cantilevered in the lever, the tooth extending transversely from the tongue; wherein, on a side opposite the tooth, a head extends from the tongue, against which a wedge-shaped portion of a button abuts, sliding with respect to the fork-shaped portion in a plane generally parallel to the U-shaped member, whereby, when the button is pressed, the head slides away from the member, thereby lifting of the tongue and disengaging the tooth from the rib.

2. The device set forth in claim 1 , wherein each of the fork-shaped portions has a first seat for snapingly securing the substantially U-shaped member and a second seat over the first seat for slidingly housing a plate extending from the button, the head being formed at an end of a column extending from the tongue and passing through the second seat, such that the head projects above the second seat.

3. The device set forth in claim 2 , wherein the button is elastically biased against the bottom of the second seat.

4. The device set forth in claim 3 , wherein a curved arm extends from the sliding plate of the button and flexibly abuts the bottom of the second seat.

5. The device set forth in claim 2 , wherein the plate is arranged about the column, sliding generally perpendicularly relative to and abutting the column, thereby being prevented from sliding out of the second seat.

6. The device set forth in claim 2 , wherein the fork-shaped portion includes a plurality of relatively parallel fins with coaxial holes for supporting the pivot, the first and second seat extending one above the other, between the fins and delimited by three substantially parallel walls, a plurality of which have a slot for housing the column on the tongue.

7. A device for varying the length of strap on a mask for aquatic activities, the mask comprising a frame for supporting a plurality of lenses and a plurality of fork-shaped portions extending from either side of the frame, each portion having a pivot about which a portion of the strap end is wrapped, the strap portion having a plurality of transverse stop ribs on one side, wherein the device includes a stop lever housed in each of the fork-shaped portions and a tooth extending from the lever for engaging one of the ribs, the lever having a substantially U-shaped member and a tongue extending from the base of the member such that the tongue is coplanar with and cantilevered in the lever, the tooth extending transversely from the tongue; wherein, on a side opposite the tooth, a head extends from the tongue, against which a wedge-shaped portion of a button abuts, sliding with respect to the fork-shaped portion in a plane generally parallel to the U-shaped member, whereby, when the button is pressed, the head slides away from the member, thereby lifting of the tongue and disengaging the tooth from the rib.