Patent attributes
A scuba diving mask with corrective lenses comprising a frame with a plurality of rings joined to one another by a bridge, each of the rings having an internal flange on which the lip of a flexible skirt, a corresponding lens and a lens-retaining collar rest. The collar is attached by snap action to the corresponding ring. A seat is formed in a bridge substantially in the lying plane of, or coplanar with, the lenses and extending laterally to an upper internal portion of the rings. The seat includes a locking plate slidable between opposing end stroke positions - a locking end position and a release end positions respectively. When the locking plate is in the locking position, the lateral sides of the plate extend inside the rings and are engaged with corresponding notches in an upper internal rim of the lens-retaining collars.
