Abstract: An air supply control device includes a fixed sleeve mounted on and extended into an air-pressure regulator to communicate an external environment with an air passage in the regulator while the air passage is communicable with a mouthpiece, and a control plate and a push-button control unit mounted in the fixed sleeve with a front flat plate of the control plate extended across the air passage of the regulator. When the push-button control unit is axially pushed, the control plate is turned to different angular position to thereby change a sectional area of the air passage. A diver may therefore control the air volume supplied from the air-pressure regulator via the air passage to the diver depending on a diving depth simply by pushing the push-button control unit to different axial position.

Abstract: An adjustable diving mask with a frame assembly has two-frames for mounting two lenses, and an angle adjusting mechanism mounted between the two frames for adjusting the included angle between the two frames, and accordingly, the included angle between the two lenses. The angle 10 adjusting mechanism includes a tight fit shaft having a tapered section and a non-circular section, about which the first and the second frame could be pivotally turned relative to each other to obtain a desired included angle between them.

Abstract: An adjustable diving mask with a frame assembly has two-frames for mounting two lenses, and an angle adjusting mechanism mounted between the two frames for adjusting the included angle between the two frames, and accordingly, the included angle between the two lenses. The angle 10 adjusting mechanism includes a tight fit shaft having a tapered section and a non-circular section, about which the first and the second frame could be pivotally turned relative to each other to obtain a desired included angle between them.

Abstract: A valve-leaf protective structure for pressure regulator of air tank used in diving mainly includes a valve-leaf seat being provided at a lower center with a retaining hole and at two sides with two raised supports, each of which is provided at an upper inner surface with a rotary shaft hole; and a valve-leaf protective cover located between the two raised supports of the valve-leaf seat, and provided at two upper outer ends with two sideward projected rotary shafts for rotatably mounted in the two rotary holes on the raised supports. A lower side of the protective cover is formed into a tongue having a hook provided at a lowermost end thereof to detachably engage with the retaining hole at the lower center of the valve-leaf seat. Therefore, the protective cover may be pivotally turned about the rotary shafts between the raised supports to close or open the valve-leaf seat.

Abstract: A flipper includes a skeleton structure having a rear base portion, two longitudinally extended side rails, and a plurality of spaced supporting strips extended in a longitudinal direction; and a web structure having a foot pocket associated with the rear base portion, two sheathings forward extended from two lateral outer sides of the foot pocket for wrapping the side rails therein, and a plurality of longitudinally extended webs provided between the two sheathings to locate between and connect two adjacent supporting strips as well as the side rails and the supporting strips. The flipper has a side rail structure with good elasticity and toughness to provide good water kicking and propelling force. A longitudinally extended slit may be provided on at least one of the webs and have a zipper provided thereat to freely adjust the length of the slit and accordingly the propelling force of the flipper.

Abstract: A fin includes a blade, which is lengthwise split into a plurality of sub-blades, so that the sub-blades are separated from one another from an outer end of the blade to a near central point of the blade; and at least one zipper, which is located between two adjacent sub-blades and adapted to zip up for the adjacent sub-blades to provide a closed area. The closed area provided by the adjacent sub-blades is adjustable by zipping up the zipper by different length to thereby regulate a propulsive force that may be produced by the blade of the fin.

Abstract: A fin includes a blade, which is lengthwise split into a plurality of sub-blades, so that the sub-blades are separated from one another from an outer end of the blade to a near central point of the blade; and at least one zipper, which is located between two adjacent sub-blades and adapted to zip up for the adjacent sub-blades to provide a closed area. The closed area provided by the adjacent sub-blades is adjustable by zipping up the zipper by different length to thereby regulate a propulsive force that may be produced by the blade of the fin.

Abstract: A mask for skin diving includes a skirt and two lenses laterally symmetrically mounted within the skirt. The skirt has two outer ends that are rearward inclined by a predetermined angle, and the lenses also have two outer ends that are rearward inclined by an angle corresponding to the skirt, so that a user's sight projecting toward two lateral sides could be widened without being blocked by the skirt. The angle by which the outer ends of the skirt and the lenses are rearward inclined is preferably within the range from 5 to 10 degrees.

Abstract: A diaphragm holder for pressure regulator of air tank used in diving includes a diaphragm seat formed on the pressure regulator for holding a rubber diaphragm therein, a cover for closing onto a top of the diaphragm seat, and a soft push member integrally formed on the cover. The diaphragm seat is provided on an outer wall surface with spaced raised rails, and the cover is provided on an inner wall surface with L-shaped grooves corresponding to the raised rails on the diaphragm seat. Each of the L-shaped grooves includes communicable wide and narrow groove portions. By closing the cover to the diaphragm seat with the wide groove portions aligned with the raised rails and turning the cover, the rails are moved into the narrow groove portions to lock the cover to the diaphragm seat with the soft push member correctly located at an outer side of the rubber diaphragm.

Abstract: A valve-leaf protective structure for pressure regulator of air tank used in diving mainly includes a valve-leaf seat being provided at a lower center with a retaining hole and at two sides with two raised supports, each of which is provided at an upper inner surface with a rotary shaft hole; and a valve-leaf protective cover located between the two raised supports of the valve-leaf seat, and provided at two upper outer ends with two sideward projected rotary shafts for rotatably mounted in the two rotary holes on the raised supports. A lower side of the protective cover is formed into a tongue having a hook provided at a lowermost end thereof to detachably engage with the retaining hole at the lower center of the valve-leaf seat. Therefore, the protective cover may be pivotally turned about the rotary shafts between the raised supports to close or open the valve-leaf seat.

Abstract: A draining structure for diving mask includes a soft head cover fixedly connected to a rigid skirt framing a lens. The soft head cover includes a forward projected nose portion having a draining valve provided at a bottom thereof to be openable only in an outward direction. A draining guide is provided below the nose portion and has a hole formed directly below the draining valve to prevent water from sideward flushing open the draining valve when a diver jumps into water in a vertical position. An upward projected flange is provided at a rear end of the draining guide to guide air bubbles produced by the diver's expiration to two side outlets of the draining guide. The flange also reinforces the two side outlets and prevents them from deformation when the head cover is put on the diver's head and presses against the side outlets.

Abstract: The present invention is to offer an improved structure of draining mechanism for soft nose protrusion type diving mask, which essentially comprises a valve flap seat with a plurality of through holes, is directly and integrally jointed at the bottom of a nose protrusion body of a soft liner frame when moulding the said frame of the diving mask and provided with an one-way valve flap; based on the integral structure of valve flap seat and nose protrusion body, when operating "balancing pressure" to tightly pinch the nose protrusion body, no gap will be formed between the valve flap seat and the nose protrusion body to effectively prevent infiltration water; and a bent flow-guiding device moulded integrally with and beneath the nose protrusion body and extended to the two sides of diving mask can drain and guide flow so as to prevent the exhausted bubbles from affecting the diver's visibility.

Abstract: An easily adjustable fastening belt for holding a dive knife including a belt and a male and a female fastening means separately connected to two ends of the belt. A length of the belt near the end having the female fastening means connected thereto is provided at an inner surface with a plurality of teeth. The female fastening means is provided at a body-facing side with a leaf spring member and at an outer side with a pivotally connected cover plate. The leaf spring has one end always pressing against a force-applying end of the cover plate, such that another end or a resistance end of the cover plate shall normally press against the toothed belt, so that the end of the belt with the female fastening means can only be pulled forward to tighten the belt around a wearer's leg.

Abstract: The present invention offers a fastener structure between a diving flipper and a tightening strap thereof which is characterized in the following design the fastener comprises a male fastener and a female fastener; the male fastener is-provided at one end of the tightening strap, a tenon extending forward is formed at the front end of the male fastener, a recess is provided in a suitable position on each of two sides of the tenon, a holding down plate at the top of male fastener can adjust the tightness of tightening strap and brake the tightening strap from time to time; the female fastener is combined on one side of the diving filpper, a fastening plate pivotally provided on each of two sides of the female fastener extends inward from outside, the inner end of fastening plate has a catch, another end (outer end) thereof has a pressing portion, a bevel arm on one side of the fastening plate contacts against the inner walls on two sides of the housing so as to keep the catch at inner end of fastening plate te

Abstract: The present invention is related to a structure of diving mask wherein a nose notch is formed on the soft skirt of diving mask, a nose slot is provided in a corresponding position on the mask frame can nest the nose notch, a plurality of frame slots are provided around the outer periphery of nose slot to fix a hard nose cover, the bottom of nose cover is provided with a drain valve to drain the water accumulated in the diving mask; and one each flowguide hole is provided on the two sides of nose slot, a flowguide cover covers the exterior of the nose cover and flowguide holes, a flowguide passage is fromed between the interior of flowguide cover and the flowguide holes, so the accumulated water drained out of the drain valve on the nose cover can be guided to flow out to the exterior of the two sides of diving mask through the flowguide holes on the two sides of nose slot in order to avoid disturbing the diver's vision.