Abstract: Embodiments of improved snorkeling equipment are disclosed, each enabling a swimmer to submerge his or her head and body a few feet beneath the water surface, to swim freely beneath the water surface without concern for the position of the air tube, and to draw in and expend out air with ease.

Abstract: A breathing structure of snorkeling apparatus of present invention is characterized in that a ventilating valve is provided between a space formed by tube body under main tube with main body under mouthpiece and above exhaust valve, the ventilating valve includes a valve seat and a valve plate, a through hole connecting with main tube is provided on the valve seat, the valve plate which can cover the through hole and its specific body; the structure of the valve plate is designed to form movement by means of closing as blowing and opening as sucking, which can make snorkelers breathe fully. A recess provided on the main body, which is a stagnant position as the valve plate being floated off. The specific gravity of the valve plate for ventilating valve is between 0.95-0.2.

Abstract: A snorkel for use in swimming. The snorkel includes an elongate breathing tube having an upper portion and a lower portion. A lower opening is formed in the lower portion and an upper opening is formed in the upper portion. A mouthpiece is located at the lower opening of the snorkel. A one-way valve is disposed in the lower portion and is oriented to prevent the flow of fluids into the lower portion, but to permit the flow of gases and fluids out of the lower portion. A check valve is disposed in the upper portion. The check valve includes a plate pivotable from an open position permitting airflow through the upper opening, to a closed position preventing airflow through the upper opening. A spring member contacts the plate, biasing the plate in the open position.

Abstract: An air valve device for a snorkel device includes a float having a chamber and a bottom port and an upper barrel which has an upper valve seat. A casing has a cylindrical duct slidably engaged on the barrel and may be moved downward along the barrel and disengaged from the valve seat when the casing is buoyant on water such that the air may flow into the float via the casing. The casing may be forced to engage with the valve seat and to block the air passage into the float and to prevent the water from entering into the float when the casing is immerged into the water.

Abstract: A breathing apparatus adapted for use in combination with a tube for swimming, the breathing apparatus includes a floatable body having a hollow case for floating over water level and an opening; and a breathing assembly mounted detachably. The breathing assembly has a connector inserted within the opening of the floatable body; a fixing cap mounted on the floatable body for preventing separation of the breathing assembly from the floatable body, and for providing fresh air from the outside to the breathing assembly; a mouth connecting member connected to the connector and providing air to the swimmer's mouth; an air intake check member having an inlet check valve opened only in one direction for preventing upward flow of exhausted air; and a water intake check member having an outlet check valve also opened only in one direction for discharging exhausted air and for preventing entry of water into the breathing assembly.

Abstract: A diving device that allows the diver to go below the surface of the water and still breath surface pressure air. By using a plurality of check valves and a helmet and carapace, that keeps the surface pressure around the divers critical chest, head, neck, and abdominal area. The old law that you can not breathe surface pressure air below the surface is broken. 2 long hoses communicates with the surface, and allows even novice divers to reach 10 to 30 feet below the surface with a heretofore-unknown safety and ease. This can be thought of as taking a submarine to its smallest possible size.

Abstract: The instant invention is a skin diving snorkel having a conduit with an end above the water surface, and an underwater end that terminates in a mouthpiece. The mouthpiece provides a flow path between the conduit and the interior of the diver's mouth. A buoyant chamber, separate from the conduit, surrounds and is coaxial with the conduit above water end. A lower opening in the chamber is joined to the conduit by a convoluted diaphragm. The convoluted diaphragm provides a flexible and watertight barrier that enables the chamber to be easily buoyed a short distance upward, guided by the snorkel conduit. The conduit's open end protrudes loosely through an upper opening in the chamber. The conduit open end carries a flexible circular diaphragm which, when it makes contact with the upper opening of the buoyed chamber, serves as a check valve allowing exhalation flow from the conduit to ambient, but blocks the flow of water into the snorkel.

Abstract: A snorkel with a unique strap hook and snorkel tube arrangement which permits both selective release and adjustment of the strap hook, but only when release or adjustment is desired and not by inadvertence. In a preferred embodiment, the snorkel tube is provided with a hook slide region enclosed along the tube surface by an elongated border. Inside each side of the border there is a recess for receiving rails of a strap hook having dove tail cross-section rails. The dove tail relationship between the recesses and the rails prevents inadvertent release of the strap hook from the snorkel tube. However, an opening at one end of each such recess, permits selective removal of the strap hook from the snorkel tube.

Abstract: A mouthpiece for underwater breathing pipes, including on its upper part a mouth element and on its lower part at least one water draining valve with a certain downward slope as to a lying plane including the mouth element. Said mouthpiece includes at least two opposite side parts, hollow and provided with the means allowing to connect, removably and watertight, to a side part a breathing pipe, and to the opposite side part a closing plug; said means allow a total interchangeability of the positioning of the breathing pipe and the closing plug to the right and/or to the left as to the mouthpiece mouth element and water draining valve.

Abstract: A snorkel tube holder integrally made of injection molding plastics includes a hollow circular body for securely holding the snorkel tube and a clip for fastening the holder to a strap of a goggle mask. The body has a curved first arm with a bent first lug, a curved second arm pointing in opposite direction against the first arm and has a bent second lug, and a slot separating the first and second arm. By pressing the first and second lug against each other with two fingers of one hand, the holder may be moved quickly along the snorkel tube for adjusting the position of the holder on the tube.

Abstract: The instant invention is a skin diving snorkel having a conduit with an end above the water surface, and an underwater end that terminates in a mouthpiece. The mouthpiece provides a flow path between the conduit and the interior of the diver's mouth. The conduit is divided along its length into two or more segments. The end of one segment slips with close clearance into a mating socket of the adjacent end of the next segment. The close fit of mating surfaces provides a substantially watertight joint. A small diameter elastic cord threaded, under tension, inside the conduit joins the conduit segments. One end of the elastic cord is attached to the conduit near the above water opening. The other end of the elastic cord is attached to the conduit near the mouthpiece opening. The elastic cord stretches when the segments are separated, and functions as a hinge that allows the separated segments to be placed side by side even though they remain connected by the elastic cord.

Abstract: A snorkel is designed for swimming is shaped to offer a minimum of drag to permit the user to expend less energy while moving with greater speed through the water. The lower portion of the snorkel is constructed from a flexible internal skeleton/external shell which enables the breathing tube to closely conform to the head of the swimmer, eliminating gaps that give rise to turbulence and drag. The snorkel also features a cross-sectional profile that minimizes water resistance. The lower portion of the snorkel is in the shape of a half circle, with the straight edge facing the user and the circular edge facing outward and offering a streamlined profile to the water. The upper half of the snorkel is in the shape of an airfoil, with the tips pointing into and away from the direction of motion, thereby facilitating movement of the snorkel through the water.

Abstract: A “dry” diving snorkel having an elongated body and separate air inlet and exhaust passages defined in the body. The snorkel body is of an arcuate configuration and the lower side of the body upper end faces downwardly during normal use. Air inlet and exhaust ports are defined in the snorkel body upper end lower side in side-by-side relationship, and a diaphragm valve is located within each port biased toward a normally closed condition. The mouthpiece at the body lower end includes a water drain valve, and a strap clamp is molded into the body configuration.

Abstract: Aeration tube provided on its lower end with a mouthpiece (2) and on its upper end with an air intake hole (41), such tube consisting in its length of two or more tubular elements (1, 3) connected in such a way that the tube can be folded two or more times on itself.

Abstract: A diving snorkel having a mouth portion and a main pipe molded from thermoplastic materials. There are two extending folding pieces and two matching recesses on the upper end. After the two folding pieces are pressed into the recesses by the external force, an anti-water piece is formed.

Abstract: A breathing apparatus to be worn about the face of a swimmer to allow normal breathing through the nose and mouth while swimming face-down in water. The apparatus comprises two masks, an outer mask assembly covering the facial area of said wearer with a clear viewing area about the eyes and an inner mask assembly about the nose and mouth areas of the wearer which is air-tight and water-tight sealed from the outer mask so that no exhaled air from the inner mask area may enter into the outer mask area and thereby cause the clear viewing area to be fogged. The apparatus further comprises a first tube which enters through said outer mask and said inner mask at, or near, the mouth and nose area of the wearer to provide a path for fresh air to the wearer. A second tube attaches to said first tube and is long enough to protrude above the water surface when said wearer is swimming face down in water, thereby providing a continuous supply of fresh air to said wearer.

Abstract: Mouthpiece and speaker assemblies for underwater speech using SCUBA and snorkel equipment, which mouthpiece is characterized by a molded rubber or plastic mouthpiece having a regulator or snorkel connector, a lip cup and a pair of elongated, serpentine or curved teeth grips or bites extending from the lip cup for gripping by the jaw teeth of a SCUBA diver or snorkeler and facilitating movement of the lips to enable underwater speech. The mouthpiece is designed for attachment directly to an underwater speaker, a snorkel, a snorkel and speaker combination, or to the mouthpiece of a conventional second-stage regulator and speaker combination. The underwater speaker includes a pair of flexible membranes connected at a common perimeter and designed to pulse and flex responsive to the pressure pulses of a diver or snorkeler's breath and voice.

Abstract: A respiratory tube capable of regulating air-blowing pressure, including a regulation switch disposed at the intake tube of the respiratory tube for regulating the upper and lower component blowing pressure of the respiratory tube. The regulation switch is disposed with a movable damper board which is curved. By means of left and right shifting the damper board, the direction and pressure value of the air blown into the intake tube can be controlled so as to control the upward and downward directed pressure of the air flow blown into the respiratory tube. Therefore, the direction and pressure of the blown in air are adjustable in accordance with different vital capacity of different users.

Abstract: A diving snorkel provided in the proximity of at least one of an upper opening and a mouthpiece with at least one partition extending from an inner wall of a snorkel conduit and also extending longitudinally of the conduit so as to compartmentalize the conduit in its circumferential direction, and thereby enable undesirable inflow of water to be obstructed as effectively as possible and enable efficient purging of water which enters into the snorkel.

Abstract: Self-contained diving equipment comprising means (10) for refilling a compressed air tank (40) connected via a flexible air tube (1) to a snorkel and a breathing nozzle (70). The refilling means are deactivated when underwater, and an external air intake (61) is connected via a tube to the nozzle to feed air directly from the surface (10) when the swimmer is not underwater. The equipment further comprises a moisture removal device (20) and a filter (21) between the compressor (13) and the tank (40), as well as means (30) for controlling the activation and deactivation of the refilling means.