Abstract: The present invention provides a snorkel having smaller respiratory dead space or volume. The snorkel includes a mouthpiece and a tube with an inhalation lumen and an exhalation lumen. A distal one-way inhalation valve is placed inside the inhalation lumen; and a distal one-way exhalation valve is placed inside the exhalation lumen. The invention also provides a method for reducing the volume of a respiratory dead space in a snorkel.

Abstract: The present invention provides a snorkel having smaller respiratory dead space or volume. The snorkel includes a mouthpiece and a tube with an inhalation lumen and an exhalation lumen. A distal one-way inhalation valve is placed inside the inhalation lumen; and a distal one-way exhalation valve is placed inside the exhalation lumen. The invention also provides a method for reducing the volume of a respiratory dead space in a snorkel.

Abstract: The present invention provides a snorkel having smaller respiratory dead space or volume. The snorkel includes a mouthpiece and a tube with an inhalation lumen and an exhalation lumen. A distal one-way inhalation valve is placed inside the inhalation lumen; and a distal one-way exhalation valve is placed inside the exhalation lumen. The invention also provides a method for reducing the volume of a respiratory dead space in a snorkel.

Abstract: The present invention provides a snorkel having smaller respiratory dead space or volume. The snorkel includes a mouthpiece and a tube with an inhalation lumen and an exhalation lumen. A distal one-way inhalation valve is placed inside the inhalation lumen; and a distal one-way exhalation valve is placed inside the exhalation lumen. The invention also provides a method for reducing the volume of a respiratory dead space in a snorkel.

Abstract: The present invention provides a building piece comprising a first wing, a second wing, and a flexible belt connecting said two wings. The first wing has a first front side and a first back side, and the second wing has a second front side and a second back side. At least two of the four sides each comprise a topographical profile or a landscape. In the present invention, the term “landscape” can be used interchangeably with the term “topographical profile”. The landscape on any one of the at least two sides can be reversibly interlocked, or is reversibly interlockable, to another one of the at least two sides.

Abstract: The present invention provides a building piece toy including a first container comprising a first cavity with a first opening, a second container comprising a second cavity with a second opening, and a flexible belt connecting said two containers. The container is tapered monotonously in all dimensions from the opening to the rest of the container's body. Many of the building pieces are interlockable to each other, so a player can create toys with a shape of human, animal, or plant such as lobster, butterfly, peacock and chicken.

Abstract: A modifiable boomerang comprises of a pair of wing blades which have a curved top surface and a flat bottom surface. The wings are connected together by a pivot bolt to form a boomerang whose angle can be adjusted to change the aerodynamics of the flying boomerang. A thrower can change the angle of a boomerang to change its flying pattern.

Abstract: A rotatable toilet tank lever equipped with a stopper has a controller to limit its upward movement. When engaged, the upward movement of the controller is stopped by an adjustment stick hitting the cover of toilet water tank. Therefore, the upward movement of the flapper inside the toilet tank is also limited and the amount of water, about half a gallon, draining into the toilet suffices to flush liquid human waste. When the intervention of the controller is eliminated by turning the handle of the rotatable toilet tank lever with controller clockwise 90 degrees to 180 degrees then the flapper can be lifted all the way up to float in the toilet water tank to allow the whole tank of water, about two gallons, to drain into the toilet bowl to flush solid human waste.

Abstract: The present invention provides a massaging device having two opposite massaging surfaces for massaging human body. A heating unit is encapsulated inside a casing, and the casing includes two parts that are releasably connected to each other, each part having a truncated shape of oblate spheroid. The invention exhibits numerous technical merits such as simpler but robust structure, improved manufacturability, and capability of maintaining warm temperature for longer period of time, among others.

Abstract: A convertible bicycle has separable front and rear wheel units. The convertible bicycle can operate in individual or in tandem mode as a tricycle unit. The rear wheel unit has a vertical interlocking gear which can interface with a frontal interlocking gear of the frontal wheel unit. The front wheel unit of an auxiliary bicycle can be detached and the remaining rear wheel unit attached to the rear wheel unit of another bicycle in order to form a tandem tricycle.

Abstract: The present invention provides a tire repairing plug, a kit comprising a plurality of such plugs with different dimensions and designs to fit different tires and different damages thereon, and a method of using the plug to repair a damaged tire in vehicles such as bicycles, motorcycles, cars, and trucks etc. The plug incudes a cap and an elongated body, and a middle portion of the body is bigger than any other portions of the body. The invention exhibits numerous technical merits such as simpler operation, higher effectiveness and improved reliability in repairing a damaged tire, among others.

Abstract: The present invention provides exercise apparatus comprising a first handle, an elongated connector, an extension director, a second handle, a rod, and an elongated elastic member having a first end and a second end. The extension director is configured to direct the first end of the elongated elastic member to move to a first direction when the elastic member is stretched by pushing the first handle and the second handle closer to each other, and to a second direction when the elastic member is stretched by pulling the first handle and the second handle away from each other.

Abstract: The present invention provides exercise apparatus comprising a first handle, an elongated connector, an extension director, a second handle, a rod, and an elongated elastic member having a first end and a second end. The extension director is configured to direct the first end of the elongated elastic member to move to a first direction when the elastic member is stretched by pushing the first handle and the second handle closer to each other, and to a second direction when the elastic member is stretched by pulling the first handle and the second handle away from each other.

Abstract: When two conventional safety razor double-edged blades are superposed on top of each other, there is no space in between them to pass the shaving residues. The presently invented safety razor double-edged blade is equipped with several spaced protuberances on its surface. When two of these present invented blades are overlapped, there is a space between them to pass the shaving residues to be rinsed away by running water. Therefore two, three or more of them can be superposed on a single razor blade holder to allow the user to experience all the benefits of a multi-blade razor cartridge in a safety razor blade system.

Abstract: The adjustable variant resistance exercise apparatus has installed several different resistant elastic springs and can provide variety of resistance for exercise. Man, woman, boy and girl can share the same one of adjustable variant resistance exercise apparatus for exercise. User can upgrade or downgrade exercise resistant power by adding more or remove some elastic rubber bands for exercise.

Abstract: The dual function bicycle air hand pump has functions of bicycle air pump and exerciser. The piston of the dual function bicycle air hand pump has installed a piston which has an off-center threaded canal, which can be closed either by a one-way valve threaded tube and or by a bolt. By simply exchanging the one-way valve threaded tube with a bolt and vice versa, the dual function bicycle air hand pump can be used as a bicycle air pump or an exerciser. When one-way valve threaded tube is used to close the off-center threaded canal of the piston the dual function bicycle air hand pump can be used as an air pump to pump air into a bicycle tire. When a bolt is used to close the off-center threaded canal the dual function bicycle air hand pump can be used as an exerciser for the training of muscles. It is very easy to exchange the one-way valve threaded tube with a bolt and vice versa.

Abstract: The constant hot temperature flat massage ball comprises one top shell-shaped receptacle, one bottom shell-shaped receptacle and a central heating unit which is either a hot water bag, which has circulating water tube, a water pump and a precision temperature control hot water reservoir equipped with a thermostat, or an electric heating pad, which has an electric cord and a thermostat. The top shell-shaped receptacle has a central recess to store the heating unit and a circular female threaded wall at the upper portion of central recess. The bottom shell-shaped receptacle also has a central recess to store the heating unit, a circular male threaded embankment above the central recess to screw into the above-mentioned circular female threaded wall and a groove which is built transversely across its wall and the above-mentioned male threaded embankment to admit the above mentioned circulating water tube and electric cord.

Abstract: When two conventional safety razor double-edged blades are superposed on top of each other, there is no space in between them to pass the shaving residues. The presently invented safety razor double-edged blade is equipped with several spaced protuberances on its surface. When two of these present invented blades are overlapped, there is a space between them to pass the shaving residues to be rinsed away by running water. Therefore two, three or more of them can be superposed on a single razor blade holder to allow the user to experience all the benefits of a multi-blade razor cartridge in a safety razor blade system.

Abstract: An Exercise tube with adjustable resistance can provide different compression resistance strength for exercise. A user can select the correct spring loaded small tubes of different resistance strength to add up to desired total resistance strength and insert them into bigger outer tube and big inner tube. The user can adjust the resistance strength needed for a particular exercise. In addition, different user can share the same exercise tube by adjusting the resistance strength to suit their individual needs.

Abstract: The adjustable variant resistance exercise apparatus has installed several different resistant elastic springs and can provide variety of resistance for exercise. Man, woman, boy and girl can share the same one of adjustable variant resistance exercise apparatus for exercise. User can upgrade or downgrade exercise resistant power by adding more or remove some elastic rubber bands for exercise.