Abstract: This invention relates to a mouthpiece for diving which can be attached to a regulator in scuba diving. The mouthpiece comprises a tubular air guide including first and second end portions and a pair of resilient supporting arms elastically provided contiguously of the left and right sides of the air guide second end portion. Stopper portions are provided on the resilient supporting arm portions and include side portions formed between these stopper portions and left and right outside walls of the air guide second end portion. The left and right side portions are movable so that they are opened when a person having small teeth marks bites the mouthpiece and are closed when a person having large teeth marks bites the mouthpiece. The stopper portion comes into pressure-contact with the outside wall of the inclined air guide portion, thus supporting the air guide portion.

Abstract: A locking means for a fixing band of diving mask which can fasten or release the fixing band as a fastening member to which one end of the fixing band is connected is inserted into or removed from a mask frame by one action. The locking means comprises two main portions: holders provided at the both sides of a mask frame integrally formed with a face fitting member of the diving mask, and fastening member formed in a taper shape, having three triangle pawls integrally formed with the fastening member. The three triangle pawls are so arranged as to become higher in order, so that the fastening member be gradually tightened owing to the triangle pawls as the fastening member is moved forwards. The locking means in accordance with this invention is particularly useful in a fixing band of a diving mask.

Abstract: A clasp used with a swimming article for tightening a strap wherein the clasp comprises two main portions: a frame member formed of a resilient material having longitudinal recesses along two opposite sides of the frame member and having two cutaway portions formed on the same sides of the plane of the frame member and at diagonally opposite corners thereof, and a movable bar whose opposite ends are adapted to slide in the recesses in the opposite sides of the frame member and which is adapted to be inserted into the frame by passing the ends of the bar through the cutaway portions, and into the recesses. The movable bar is snap fitted while being placed on the diagonal of the rectangle with its ends engaging with the cutaway portions, and is capable of sliding along the longitudinal recesses. A clasp in accordance with this invention is particularly useful in a diving mask or flippers.