Abstract: An air cylinder fastening device has a belt and structure for belt tightening. Belt tightening structure is attached to each of the longitudinally opposite ends of the belt, and comprises first and second slider members opposed to each other in a circumferential direction of the air cylinder and a coupler member adapted to move these members close to or apart from each other. The coupler member comprises a front segment fixed to a rotor of the first slider member, a rear segment extending from the front segment toward the second slider member, a threaded part of the rear segment extending outward through a rotor of the second slider member, a control knob screwed on the threaded part and a spring interposed between the rotor and the control knob.

Abstract: Here is disclosed a regulator for diving free from any possibility that smooth operation of respective components might be obstructed due to the presence of impurities in the air supplied from an air cylinder. In the regulator, a tubular coupler member coupling a regulator for diving to an air hose extending from an air cylinder is provided with a filter assembly.

Abstract: An air cylinder fastening device has a belt and belt tightening means. The tightening means are attached to longitudinally opposite ends of the belt, respectively, and comprise first and second slider members opposed to each other in a circumferential direction of the air cylinder and a coupler member adapted to move these members close to or apart from each other. The coupler member comprises a front segment fixed to a rotor of the first slider member, a rear segment extending from the front segment toward the second slider member, a threaded part of the rear segment extending outward through a rotor of the second slider member, a control knob screwed on the threaded part and a spring interposed between the rotor and the control knob.

Abstract: Here is disclosed a regulator for diving free from any possibility that smooth operation of respective components might be obstructed due to the presence of impurities in the air supplied from an air cylinder. In the regulator, a tubular coupler member coupling a regulator for diving to an air hose extending from an air cylinder is provided with a filter assembly.

Abstract: A tubular housing 13 constituting an air supply mechanism for a regulator 1 for diving is provided with a deflector 21 adapted to cover air outlet ports 24, 26 of the housing 13 from immediately above as viewed in a radial direction of the housing 13.

Abstract: A regulator 1 for diving has a tubular housing 13 containing therein an air supply valve 72 and this tubular housing 13 is formed with cutouts 101, 102 extending orthogonally to a longitudinal axis of the housing 13. A lever 17 interposed between the air supply valve 72 and a diaphragm 10 has its inner end 17B adapted to stride across the housing 13 and to be inserted into the cutouts 101, 102.

Abstract: A regulator for diving includes a pressure regulating means. The pressure regulating means includes a multiple thread screw 87 operatively thread-engaged with a slider 84 which, in turn, is pressed a pressure regulating coil spring 81 so that this coil spring 81 is adjusted from the maximum compressed condition to the minimum compressed condition as the multiple thread screw 87 is fully turned.

Abstract: An air guide tube 62 is mounted within a tubular portion 42 formed in a housing 13 of a regulator 1 for diving. One end of the tube 62 is formed with a valve seal 63A against which a valve 72 is pressed and another end opposite to this end is formed on its inner surface with threads 67.

Abstract: A diving fin includes a heel strap coupled to opposite sides of a foot pocket wherein coupling of at least one end of the strap to at least one of the opposite sides of the foot pocket as well as adjustment of the fastening effect of the strap on the divers heel can be achieved by a buckle. The buckle comprises a first coupling member of sheath-like configuration and a second coupling member having a plug portion adapted to be releasably engaged into the first coupling member and a retaining frame movably supports therearound the strap.

Abstract: Here is disclosed a diving buoyancy compensator being capable of regulating a buoyance of a diver and achieving rapid flotation of the diver in case of emergency. The compensator is equipped with a safety valve device adapted to be automatically opened when the compensator has been filled with an excessive quantity of air and, in the case of emergency, adapted to be opened through manual operation by the diver, to exhaust the quantity of air filling the compensator. The safety valve device includes an operating mechanism mounted in an air inlet port provided in the compensator to which an inflation hose capable of expansion and contraction is connected at one end. A pull cord connecting a portion of the operating mechanism to a portion of a power inflator carried on the other end of the hose extends through the hose so that the hose may be expanded to open the safety valve device through the pull cord.