Abstract: A snorkel clip made up of two substantially rigid elements, which are designed to wrap at least half way around a snorkel tube, overmolded with a substantially flexible element to create a simple, aesthetically pleasing device. The snorkel clip also includes a hinge region created as part of the substantially flexible element. This hinge region allows the snorkel clip to flex or bend so that one of the rigid elements may be disengaged and pulled away from the riser tube of the snorkel, so that a mask strap may be attached to and removed from the snorkel, while the other rigid element remains attached to the riser tube in a generally secure manner. The substantially flexible portion may also include several cut out sections to provide visual and tactile access to portions of the substantially rigid elements for utility and aesthetic design.

Abstract: A welding flash protection apparatus for use with a welding machine with gas shielding is disclosed, the apparatus providing for delay of the welding flash thereby preventing the typically inherent fraction of a second delay between flash and lens darkening, hence protecting the eyes. The apparatus provides a complete helmet or apparatus components for fitment to an existing helmet. The apparatus provides a unique transmitter antenna mount for the shielding gas tank.

Abstract: A tubular body is operatively coupled to an oral nasal mask and provided with lateral apertures adapted for fluid flow. A flexible valve is mounted onto one end of the tubular body and adapted to seal the lateral apertures under normal operation conditions and expose the lateral apertures for fluid flow during emergency operation conditions. The sealed lateral apertures keep exhaust gases from escaping the oral nasal mask and contaminating the interior of the diving equipment during normal operation conditions. The exposed lateral apertures allow air from an alternate source to reach the mouth and nose of a user covered by the oral nasal mask during emergency operation conditions. The exposed lateral apertures allow excess water to be removed from inside the diving equipment. The valve system may be implemented as an integrated regulator mount nut/valve system.

Abstract: A swim and skin-dive snorkel for providing positive end-expiratory pressure for pressure-balanced exhalation. The snorkel may include inhalation and exhalation conduits. Air can be exhaled into a chamber and released when exhalation pressure within the chamber exceeds a threshold pressure. The threshold pressure that must be overcome to achieve exhalation may be balanced against the compressive forces of the ambient water pressure acting against the user's chest and lungs, which may greatly reduce the resting expiratory flow rate, the minute respiratory rate, and therefore the overall work of breathing. The exhalation pressure may be linearly matched to the ambient water pressure as a function of dive depth, thereby discouraging exhalation while diving. A purge valve may also be placed at the lower aspect of the snorkel.

Abstract: A diving helmet (10) of the type having an air supply pumped to it during use. The helmet (10) including a head portion (12) substantially formed from a transparent material such that a user can see both forwardly and rearwardly. The helmet (10) further including a body contacting collar portion (18) extending from the head portion (12). The collar portion having a shoulder engaging portion (24) adapted to prevent said helmet (10) from tipping during use.

Abstract: A diving apparatus includes a support structure (18) that is engageable with a diver's head, the support structure (18) defining a lens opening (262) and an equalization opening (104). A lens (26) is mounted on the support structure (18) to close the lens opening (262) so that the support structure (18) and the lens (26) define a breathing space (30) from which the diver can be supplied with air. A sealing arrangement is positioned on the support structure (18) sealingly to engage the diver's face so that the breathing space (30) is substantially airtight. An equalization assembly (106) is mounted on the support structure (18) to close the equalization opening (104). The equalization assembly (106) includes an access means to permit the diver to gain access to his or her nose so that the diver can carry out an equalization procedure. A gas supply arrangement is in fluid communication with the breathing space (30).

Abstract: A front-mounted swimming snorkel has a forehead brace which pivots about an axis perpendicular to the snorkel tube to adapt to different swimmers' heads.

Abstract: Breathing apparatus for medicating an airstream, compring a breathing apparatus (139), a medication chamber (138) adapted to store and discharge a therapeutic agent, a delivery pathway (141) between the chamber (138) and an intake air pathway and releasing means (145) for selectively discharging the therapeutic agent from the chamber (138) into the intake air pathway. The apparatus is particularly suited for scuba diving, snorkels, gas masks and filters. The invention is suitable for asthma sufferers but also extends to other respiratory diseases. Also claimed are a medication chamber for use in medicating an airstream and a method of medicating an airstream.

Abstract: A snorkel comprising a breathing tube and a retaining device formed on the breathing tube. The retaining device includes an elongated fastening strap having a bottom end formed integrally with the breathing tube, and a top end formed with a large first hole and a small second hole being in communication with the first hole; and a button formed integrally with the breathing tube and disposed in a position about flush with the top end of the fastening strap. The button is adapted to secure to the fastening strap by passing through the first hole and locking in the second hole in response to passing a mask strap through a gap between the fastening strap and the breathing tube.

Abstract: A scuba mask purging apparatus and method providing selective introduction of pressurized air into a scuba mask to initiate purging, pressure balancing, and de-fogging. An inlet valve, typically positioned conveniently on the top or the side of the mask may control the release of pressurized air into the mask. A pressure-sensitive outlet valve releases the pressurized air to force water from the mask. The outlet valve may be positioned on the lower portion of the mask or at a location where water is likely to collect.

Abstract: A snorkel has an inhalation tube and a check valve near a mouthpiece which allows air to flow toward the mouthpiece, and a float valve which closes the inhalation tube. An exhalation tube has a second check valve also located near the mouthpiece which only allows air to flow into the exhalation tube. The snorkel has a purge valve positioned below the mouthpiece. A further check valve is positioned between the inhalation tube and the exhalation tube to allow air or water in the exhalation tube to pass to the inhalation tube placed as close to the first check valve as possible. The exhalation tube outlet orifice may be closed by a simple gravity actuated valve which will float open during a dive. Alternatively the exhalation tube outlet orifice may be closed by a float valve.

Abstract: A closure device of a second-stage regulator for scuba divers, the regulator comprising a regulator body with an inlet conduit for connection to a first-stage regulator which supplies a breathable gaseous mixture at relatively constant pressure, an outlet conduit for connection to a mouthpiece of the users, and an opening closed by a deformable diaphragm. The device comprises a locking frame connected in an articulated manner or jointedly to the regulator body to lock the diaphragm in the opening, and a member for fastening the frame to the regulator body.

Abstract: A mask adapted to be attached to a user's face is disclosed. The mask comprises a body and a gas connection structure. The body is formed with an inner space which is defined along with the user's face. The inner space allows the user to breathe through the nose. The gas connection structure connects to the body so that the inner space is connectable with the ambient air via the gas connection structure. Thereby, the user is capable of breathing through his/her nose to drive the ambient air into the inner space and reduce the moisture formed in the inner space.

Abstract: The invention provides, in one aspect, a head up display unit for a re-circulating gas self-contained breathing apparatus of the type having at least one sensor for determining the oxygen partial pressure of the re-circulating gas. At least one optical fiber (32) is provided for transmitting a light signal or signals from a respective light emitter, positioned outside the wearer's field of view and electrically connected to the at least one sensor, to a display (26) in the wearer's field of view to provide the wearer with a visual indication of the light emitter signal or signals.

Abstract: The present invention concerns a valve unit for a rebreather apparatus that recycles gas exhaled by a user. The valve unit includes a housing 5 with a first port for communication with a respiratory system of the user and a first inlet port 9 for breathable gas in said housing, a first exit port for exhausting gas from said housing into a flow channel, at least one separate second exit port 12 for exhausting gas form said housing 5 into an ambient environment, a second inlet port 13 for breathable gas connected to an open loop inlet valve 6 in said housing 5, and a valve body 4 in said housing 5 forming a valve for switching between two operating modes. The valve body 4 is formed as a barrel or cylinder with valve openings sealing against the housing 5, where the valve body 4 forms an internal cavity 18, alone or in combination with the housing 5, in connection with the port 10 for communication with a user. The valve 6 has an outlet in said cavity 18.

Abstract: A rebreather apparatus having a gas scrubber canister with a generally oval or elliptical cross section. The canister being configured so that exhaled gases pass through the adsorbent in a radial manner through a generally hollow tube having the same cross sectional shape as the canister. The shape of the canister allows for increasing the volume of the canister relative to round cylinder shaped canisters without making it too cumbersome such that it effects the efficiency of a diver. The canisters have at least one removable end cap and the end caps are configured for housing gas addition and control systems. The rebreather apparatus can be rapidly reconfigured to provide a variety of fully closed or semi closed circuit configurations and it can be reconfigured to be worn in a variety of ways based on tasks to be performed and diver preference.

Abstract: The claim over prior art is for an approach to an electronically controlled or electronically monitored breathing system that represents an improvement in electrical reliability, manufacturing cost and efficiency, user maintenance, system reliability, user cost and maintenance. These improvements are accomplished by placing the major electronic, mechanical and electromechanical control elements and sensor components in a single replaceable module.

Abstract: A diving helmet (10) of the type having an air supply pumped to it during use. The helmet (10) including a head portion (12) substantially formed from a transparent material such that a user can see both forwardly and rearwardly. The helmet (10) further including a body contacting collar portion (18) extending from the head portion (12). The collar portion having a shoulder engaging portion (24) adapted to prevent said helmet (10) from tipping during use.

Abstract: A waterproof structure of a respiratory tube is provided. The waterproof structure comprises a hollow body and a lid. The hollow body has a first opening end and a second opening end opposing to the first opening end. The lid pivots onto the hollow body at the first opening end. Before the lid is immersed into liquid, the gravity of the lid can keep the lid at a certain position so that the respiratory tube is well-ventilated. After a part of the lid is immersed into the liquid, the buoyancy provided by the liquid forces the closing surface thereof to substantially seal the first opening end and prevent liquid from going into the tube.

Abstract: A floating apparatus operable for towing at least one diver and providing compressed air thereto for underwater breathing includes a water impermeable and buoyant hollow housing that floats on a surface of a body of water. A power source is mounted on the housing and a compressor is provided and is operable by the power source for generating the compressed air. A propulsion generating assembly is operable by at least one of the power source and the compressor for generating a propulsion force capable of moving the apparatus and towing such at least one diver. A control device is operatively coupled to the propulsion generating assembly and is manually operable by the at least one diver for generating the propulsion force simultaneously with generation of the compressed air.

Abstract: In a sensor for detecting a carbon dioxide gas in an expiration gas of a living body, an airway case is adapted to be disposed below nostrils of the living body, and formed with an airway passage extending across an optical axis of a light beam emitted from a right emitter of the sensor. A mouth guide is adapted to be disposed in front of a mouth of the living body so as to define a space communicated with the airway passage. The mouth guide is pivotably supported on the airway case. A retainer is adapted to retain an oxygen supply tube on the airway adapter body in such an attitude that an oxygen gas supplied from prongs of the oxygen supply tube is not directly injected into the nostrils.

Abstract: The present invention concerns a method for detecting the start of a dive for implementation in a portable electronic device (1) of the diving computer type. More specifically, the method is for implementation in a device of this type having at least a first operating mode and a second operating mode, called the dive mode. This device includes a pressure sensor (5) for measuring the ambient pressure value (P) and electronic circuits (2) for processing the pressure measurement results including a time base (4) and at least one memory zone (7, 8). The detection method according to the present invention more particularly proposes making correction to certain measured pressure values before storing them as reference pressure values (Pref). Thus, the start of a dive can be detected with a high level of reliability solely on the basis of ambient pressure measurements.

Abstract: An information processing device for a diver used for diving by using a plurality of mixed gases in which the mixture ratios of a plurality of diving gases are the same or different determines the switch timing of the mixed gas on the basis of a preset scheduled dive pattern and an actual dive pattern up to present. A notification is issued regarding the switch timing and information for specifying the mixed gas to which a switch is to be made based on this switch timing. When the diver selects one of the cylinders as the cylinder to which the switch is to be made and in which the mixture ratio of the diving gas is different, processing is carried out that prohibits switching to the selected cylinder when it is determined that the selected cylinder may create a danger of oxygen deficiency or oxygen poisoning.

Abstract: In a sensor for detecting a carbon dioxide gas in an expiration gas of a living body, an airway case is adapted to be disposed below nostrils of the living body, and formed with an airway passage extending across an optical axis of a light beam emitted from a light emitter of the sensor. A mouth guide is adapted to be disposed in front of a mouth of the living body so as to define a space communicated with the airway passage. The mouth guide is pivotably supported on the airway case. A retainer is adapted to retain an oxygen supply tube on the airway adapter body in such an attitude that an oxygen gas supplied from prongs of the oxygen supply tube is not directly injected into the nostrils.

Abstract: In one embodiment a dive mask for use in swimming, diving including, or one of other water sports activities, includes a flexible skirt adapted to sealingly cover the face; a frame mounted around a front opening of the skirt for covering the eyes and including one or two lenses fitted therein; a flexible strap interconnecting two ends of the frame, the strap adapted to hold the dive mask on the head; and a nose enclosure formed with the skirt and disposed under, the nose enclosure being adapted to sealingly cover the nose. The nose enclosure includes a flexible portion at either side such that a pressing of the flexible portions with the hand, as a first step of “ear pressure equalization” act prior to diving, will stretch same substantially without causing movement of a peripheral edge of the skirt.

Abstract: An improved underwater breathing apparatus includes a gas- and liquid-tight helmet, with an attached air valve, tank coupling and tank bracket. The helmet further includes a flange generally conforming to the shoulders of a user, and incorporates ballast material. The air valve is attached to the helmet with the tank coupling and the tank bracket is attached to the tank coupling. When worn, the tank bracket is oriented substantially parallel to, and a finite distance away from, the user, whereby only the flange contacts the user. In other embodiments the helmet further includes an optically transparent face shield, or the entire helmet is may be manufactured from an optically transparent material. A handle may be attached to the helmet to aid in lifting and storage. The air valve may include an air flow regulator, a compressed air supply coupling or an air flow gauge.

Abstract: A dive computer with a free dive mode and/or wireless data transmission capabilities. In one embodiment the invention relates to a diving apparatus including a dive computer having a free dive mode, where the dive computer is configured to calculate a nitrogen loading in the free dive mode using a default value which is the fraction of oxygen in air, and where the free dive mode is used when a diver makes a dive without a self-contained underwater breathing apparatus. Another embodiment includes a method of operating a dive computer including recording two or more first identifiers, receiving pressure information from two or more pressure transmitters, the pressure information comprising second identifiers and pressure measurements, determining whether the pressure information contains one of the two or more first identifiers, and displaying a message indicative of the pressure information that contains one of the two or more first identifiers.

Abstract: An underwater exhaust system includes an exhaust valve with a valve cover operatively coupled thereto. The valve cover is adapted to create an exhaled air pocket on the water interface side of the valve. The exhaled air pocket allows the valve to operate under reduced water resistance. The valve cover includes at least one water inlet passage and at least one exhaust gas opening.

Abstract: A group for controlling a second-stage regulator for scuba divers. The regulator comprises a regulator body with an inlet conduit for connection to a first-stage regulator which supplies a breathable gaseous mixture at a constant pressure and an outlet conduit for connection to a mouthpiece of the user. The group comprises a first bushing defining an intermediate chamber with a bottom wall wherein a central hole is formed, a poppet loosely engaged within the hole, the end of the poppet being connected to lever means, a second bushing engaged in the first bushing and defining an inlet chamber and a third bushing engaged in the second bushing and defining a regulator seat at one of its ends. The head of the poppet engages tightly in the seat and an elastic member is provided coaxial to the poppet in the intermediate chamber for maintaining the head against the regulator seat.

Abstract: A diving mask includes a nose cover and a valve seat of a drainage mechanism having a check valve formed in the vicinity of the nose cover. The nose cover and the value seat are formed from an elastic material which is integral with a soft elastic material forming the nose cover. In the vicinity of the valve seat, an annular member formed from a plastic material plastics having a hardness and deformation-resistance both higher than those of the elastic material forming the valve seat is embedded in a bottom of the nose cover so as to extend along the valve seat.

Abstract: Device for rapidly attaching and suspending in an articulated manner breather pipes on the strap of diving goggles. Said device comprises a part able to be attached in the manner of a sleeve to the strap of the diving goggles and provided with a box-shaped lug having an end wall with a hole in the centre and an elastic split ring part with two slightly splayed ends which has, in the separation zone, two pins with a semi-circular cross-section and enlarged heads projecting radially outwards from said ring, so that when the elastic split ring is compressed they are united, forming a head which is able to pass through the hole of said lug, said pins being again spaced elastically after passing through, so as to prevent the head from coming out of the hole of the end wall of said box-shaped part.

Abstract: A diving computer is provided. The diving computer includes a computer connected to a dot matrix screen to display information concerning a dive. The computer has an interface to an external personal computer for reprogrammably configuring the information displayed on the screen. The user may customize the information on one or more views of the screen in several ways. The user may select the desired information to be displayed, and may customize the size and placement of the information on one or more views. The diving computer also has a number of pre-programmed displays that may be selected, each of which present different layouts and organizations of diving related information.

Abstract: A device is disclosed for adjusting the length of a strap on a mask for aquatic activities. The mask comprises a frame for supporting one or more lenses and a plurality of fork-shaped portions extending from either side of the frame. Each portion contains a pivot about which a portion of a strap end is wrapped, the portion having a plurality of stop ribs on one side. The adjustment device comprises a stop lever housed in each portion and a tooth extending from the lever for engaging one of the ribs. The lever has 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. 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 on a plane generally parallel to the U-shaped member.

Abstract: A pneumatic sealing system for a gas mask, which seals the mask to the face of the user by using a pump that employs air from inside the gas mask to variably inflate a mask seal during the breathing cycle. A double diaphragm pump, which has a driving diaphragm and a driven diaphragm, is connected to the inflatable mask seal via a hose duct. The double diaphragm pump is driven by the pressure difference inside the gas mask. During inhalation, the driving diaphragm fills with ambient air and the driven diaphragm fills with filtered air. During exhalation, the driving diaphragm and the driven diaphragm compress, releasing and trapping air in the mask seal.

Abstract: A snorkel and snorkel system are disclosed. The snorkel includes an arching breathing tube with a mouthpiece at a first end and a breathing port at a second end. The arching breathing tube preferably arches through a range of angles between 240 and 300 degrees and mouthpiece and the breathing port are separated by a distance in a range of 8 to 16 inches. The snorkel system preferably includes a strap with a bracket for securing the snorkel to a user's head and along a front portion of the user's face.

Abstract: A remote breathing assembly includes a periphery viewable goggle, an air-tube, and a remote breathing apparatus. The goggle includes a transparent lens having a front section that defines a lateral front length, and left and right sections that extend transversely from the front section a minimum length. The goggle further includes a compressible liner, a liner interface and securing means for fixing the goggle relative to a wearer's face. The air-tube presents upper and lower ends. The lower end is coaxially aligned with an opening defined by the lens and sealably attached to the goggle. The apparatus is removably coupled to the air-tube near the upper end, and retains the upper end in a fixed position relative to the lower end.

Abstract: The invention relates to a “breathing tube fastening structure”, mainly comprising a fastener, buckle, pipe hoop, snatch-hook and snatch-hook stand and snatch-hook stand. The invention is fixed on the exterior of the lateral side of a head strap. The characteristics of the invention include that the fastener has two knobs formed on both lateral sides, both are correspondently disposed in two round holes and a coupling portion, the snatch-hook has one end thereof recessed with two projections extended to lock inside two round holes on the surface of the snatch-hook, an opening form extend two hook portions and pierced through a hooking groove disposed on the surface of the snatch-hook stand, moreover, a round grip portion of the pipe hoop is locked into a sliding groove of the snatch-hook stand, thereby enabling the pipe hoop to revolve. When a breathing pipe is sleeved in the pipe hoop, the fastener loosens the pipe hoop, thereby enabling the breathing pipe to shift up or down.

Abstract: Provided is a snorkel having a whistler. In one embodiment, the whistler is mounted on a breathing tube. A swimmer wearing the snorkel may seize the whistler by the mouth prior to making a clear, shrill sound by activating the whistler.

Abstract: Regulator for underwater breathing devices including a relatively hard material box-like body having a pipe for the connection with a mouthpiece, at least one air inlet duct and at least one opening on which-it is positioned one air exhaust valve. The regulator box-like body is externally covered by at least one layer of a suitably shaped relatively soft material.

Abstract: A self-contained system which converts nitrous oxide to a breathable gas mixture of nitrogen and oxygen. In the preferred embodiment of the present invention, a portable system is disclosed wherein liquefied nitrous oxide is converted to a breathable gas mixture of nitrogen and oxygen. The decomposition occurs over a catalyst bed which is all contained in a small reactor. The invention is useful for underwater, fire fighting and outer space applications.

Abstract: A splash protector mounted at top of snorkel is disclosed and includes a tube-shaped adapter unit secured to the snorkel and including a passage; a float unit pivotably secured to the adapter unit and including a projected lever and two upper engagement members (e.g., tabs) at two sides of the lever; a closure unit pivotably secured to the adapter unit and including two mating engagement members (e.g., indents) at both sides, and a closure member adapted to close the passage when the lever pivots upward; and a splash guard secured to the adapter unit for receiving both the float and closure units and including windows for fluid communication. The engagement members are adapted to lockingly engage with the mating engagement members for stopping the closure unit from further pivoting upward and thus preventing the passage from being closed by the closure member undesirably.

Abstract: Disclosed is an apparatus and methods for a plurality of users to work and/or play underwater with a supply of breathable air. The breathable air is taken from the atmosphere above the surface of the water. The air is sent to one or two submerged users. The apparatus and its components are enclosed in a water resistant enclosure encapsulated by an inner tube which floats on the surface of the water. The apparatus provides breathable air to one or two users from a flexible air supply line, which runs from the apparatus to each submerged user. The air pumps of the apparatus push a constant flow of breathable air to each user. Each user inhales air from the apparatus with a mouth piece that is connected to the air supply line which is connected to the air pumps. Equipment such as regulators, tanks or reservoirs are not needed. The apparatus is powered by a dry cell battery and does not require fuel to operate.

Abstract: Provides an emergency air supply system that is worn around the arm, presumably the wrist, and intended for use in air restrictive emergency conditions. Primarily it has been designed for the need to improve safety for water recreation or water sports where an individual is often caught gasping for air. This device is purposely designed to be no more obtrusive than a piece of clothing, such as a bathing suit, or a watch band would be, in order that it does not unduly restrict the water activity or water sport or any other potentially air restrictive activity you may engage in. The design is intended to encourage usage and increase safety, by way of its structural design that uses the strap-band itself as the mechanical structure of the entire mechanism. Thus creating a unique compact design, that is convenient to wear and provides air when you most need it.

Abstract: Here is disclosed a snorkel clip comprising a first clip member attached to a strap of a face mask for swimming or diving and a second clip member to which a breathing conduit of the snorkel is attached. The first clip member has a guide enabling the second clip member coupled to the first clip member to be moved in a longitudinal direction of the strap. The first and second clip members are formed with stopper means adapted to retain the second clip member at a desired position in the guide.

Abstract: There is described a demand valve for a breathing apparatus with a “first breath” mechanism, wherein a demand valve is held closed by resiliently latching an operating diaphragm of the valve in a position wherein the valve is closed. The diaphragm is resiliently biased towards opening the valve, and the resilient latch is arranged to exert sufficient force so as not to be overcome by the resilient bias alone, but so as to be overcome by the combination of the resilient bias and a predetermined pressure difference across the diaphragm caused by sub-ambient pressure within the facepiece of the breathing apparatus.

Abstract: A system and method of providing a wireless heads-up display for displaying the amount of breathing gas remaining in an associated breathing gas supply is provided. The system has a transmitter and a receiver. The transmitter has a pressure sensor and a controller for interpreting the sensed pressure into levels indicative of the amount of breathing gas remaining in the breathing gas supply. These levels are transmitted via radio frequency to the receiver. The receiver, which can be mounted in a breathing mask, includes a display for displaying the amount of breathing gas remaining in the associated breathing gas supply.

Abstract: A valve device, particularly for a breathing regulator for divers, including an inlet chamber which can be connected to a source of gas under super-atmospheric pressure, and an outlet chamber which is under a regulated pressure. A seating, which is movable under the influence of the super-atmospheric pressure and the regulated pressure, seals between the inlet chamber and the outlet chamber and has a through-passing passageway that interconnects the chambers. Also included is a valve body which is movably arranged in the seating such as to open and close the through-passing passageway in the seating. A servo element exerts on the valve body a force that depends on the position of the movable seating, so that varying force-influence on the valve body from the super-atmospheric pressure will be compensated for by a corresponding varying force from the servo element. This results in an essentially constant valve characteristic, while providing a mechanically simple solution at the same time.

Abstract: A mouthpiece set of a snorkel including a base, a connector, and a mouthpiece, wherein the base connecting to the snorkel and the connector having an upper end connecting to the mouthpiece and a lower end including a sphere inserted into a concentric hollow cylinders of the base, thereby enabling the mouthpiece rotating freely through the free rotation sphere of the connector.

Abstract: The instant invention is a valve for the top end of skin diving snorkels having a conduit with an open 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 top valve consists of a soft diaphragm mounted on a compound linkage. The linkage is attached to the conduit adjacent the top opening. A float activates the valve linkage whenever the snorkel starts to descend below the water surface. By the time the open end of snorkel is underwater, the linkage has moved the diaphragm over and against the top opening thereby preventing water from entering the conduit.

Abstract: A waterproof device for a snorkel is mounted on a distal end of a breather pipe and has a lower shell, a ring, an upper tube with an open end, an elastic collar, and an upper shell. A lower pipe is mounted to a lower end of the lower shell and the ring is received into the lower pipe. The upper tube is pivotally connected to the ring via the elastic collar securely mounted between the ring and the upper tube. A seal board is mounted in an inner wall of the upper shell thereby achieving a water proof effect when the open end is securely connected to the seal board.