Abstract: Diving mask comprising a body made of rubber or a material similar to rubber provided with a peripheral edge which extends parallel with the plane of an ocular opening or openings; at least one lens made from tempered glass or transparent plastic which is shaped to match the shape of the ocular opening or openings respectively; and a main frame provided with several spaced apart attachment teeth which hold the said lens on lenses respectively in place, pressing them elastically and leaktightly against the said peripheral edge of the body. A variously shaped and decorated outer frame may be fitted over this main frame.

Abstract: Swimmimg fin of the type having an open shoe comprising a shoe portion (201) and a blade portion (101), in which the top surface (211) of the sole of said shoe portion (201) comprises two or more longitudinal ribs (121) projecting into the interior of the shoe portion (201).

Abstract: Fin with buckle for securing the heel strap to the open-shoe type fin, in which said buckle comprises: a base piece on the side of the fin next to the socket for the foot; an intermediate lever hinged at one end in said base piece; and an end piece bearing at one end the means for connection to said strap, while its other end is hinged at a point on said intermediate lever between the end hinged to the base piece and the free end.

Abstract: Device for the rapid attachment and release of aqualung cylinders to and from a back structure comprising: a rigid support which is connected to the cylinders by means of belts and is provided at one end with a blocking recess, and a back structure which can be connected to the stabilizer jacket and is fitted with a transverse bar which couples with the recess in the rigid support. This back structure is provided near the end opposite the transverse bar with a pin which may be coupled to a mating hole disposed near the end opposite the recess. A spring clamp cooperates with said hole so as to disengageably lock said pin whenever inserted in the said hole.

Abstract: A safety catch in particular for underwater guns or the like, comprises movable means for locking the travel of a trigger for activation of means of firing a projectile element. In oder to avoid direct, visual checking of the condition of the safety catch, according to the invention the safety catch is provided with means for indicating the condition of activation thereof, which in the position of locking the travel of the trigger are disposed such that they can be felt directly by the hand or finger which controls activation of the trigger, in the normal position For grasping the grip of the gun and/or the trigger.

Abstract: Swimming flipper of the type in which the flipper part has at least two or more channels for restricting and directing the streams of fluid generated during swimming, characterized in that said channels are made with opposite concavities.

Abstract: An automatic regulator for breathing apparatus, comprising a chamber which communicates with the breathing apparatus, including therein an air-dispensing valve, and a chamber which communicates with the environment. Said chambers are sealingly separated from each other by means of a flexible membrane which controls the dispensing valve, while the chamber which communicates with the environment is defined exteriorly by a cover provided with a tongue which is obtained by a partial cut in the front face of said cover and which is resiliently deflected inwards by an external depressing force, so as to deflect said membrane towards the interior of the chamber which communicates with the breathing apparatus and to cause the opening of said dispensing valve.

Abstract: A swim fin provided with a canal-like member for conveying and controlling the fluid flow produced during each swimming stroke. The fin comprises at least at the central portion of its blade a section which, by dynamical deformation, gives rise to a canal-like fluid flow conveying member on that side of the fin opposed to the side under active stroke. The canal-like member is inverted as soon as the swimming stroke is reversed, so as to perform its fluid flow conveying action during both swimming strokes.

Abstract: A floating piston member formed with an axial conduit communicating with the air-feeding conduit from the first stage of reduction of an air bottle, is provided at one end with a valve seat. The floating piston member may be displaced between a first operative position, in which it is pushed by air pressure against the seal of a valve member against the action of a spring, and a second position wherein it is separated and moved away from the seal of the valve member by the action of the spring. The valve member is controlled by the manostat diaphragm of the breathing apparatus, through a suitable transmission and is urged constantly toward the valve seat by a spring.

Abstract: A portable shooting weapon comprises a releasable firing mechanism and a cooperating trigger and pin for releasing the firing mechanism. The trigger actuates the pin when the trigger is moved by a finger of a shooter. The trigger comprises a first, downwardly extending body portion fulcrumed to the shooting weapon. A second body portion is slidingly supported in the first body portion so that the second body portion is shiftable in a fore and aft direction with respect to the first body portion. The first and second body portions of the trigger are connected together in an easily disengageable manner at a number of pre-set relative positions. The second body portion of the trigger projects beyond the first body portion and the extent of projection is adjustable by disengagement and movement of the second body portion of the trigger with respect to the first body portion.

Abstract: A swim fin provided with a canal-like member for conveying and controlling the fluid flow produced during each swimming stroke. The fin comprises at least at the central portion of its blade a section which, by dynamical deformation, gives rise to a canal-like fluid flow conveying member on that side of the fin opposed to the side under active stroke. The canal-like member is inverted as soon as the swimming stroke is reversed, so as to perform its fluid flow conveying action during both swimming strokes.

Abstract: The battery assembly is housed in the casing of the flashlight so as to be axially slidable therein, whereby the displacement of said assembly in one direction closes the electrical circuit comprising the bulb, and the displacement in the opposite direction opens said circuit. A pushbutton radially extends from the flashlight casing. The said pushbutton is provided with a cam-shaped portion cooperating with an axially slidable cam follower to transmit the axial displacement to the battery assembly.

Abstract: A spear gun having a dog member is fulcrumed to a vertical pin carried by the trigger guard of the handgrip of an underwater gun. Said dog member is provided with sidewise outwardly projecting arm, and is further provided with an intermediate notch cooperating with the front edge of the lower end of the trigger, to lock said dog member into line retaining position whenever the trigger is in its rest position, and to unlock said dog member into line releasing position upon operation of the trigger. The dog member is cam shaped in proximity of said notch, and the said cam cooperates with the front edge on the trigger in order to automatically reset the dog member into its cocking or line retaining position after each shot.

Abstract: A diving mask comprising an eyeglass mounting frame; an outer frame made in two pieces which can be connected together by means of coupling members; and a rubber face piece provided with a front aperture, the peripheral rim of which overlaps the outer rim of the said eyeglass mounting frame, and is clamped between the outer rim of the said eyeglass mounting frame and the internal rim of the said outer frame; and fastening means on the outer frame and on the eyeglass mounting frame for fastening the said members together at least in correspondence of the mask median axis.

Abstract: A diving mask comprises a rigid front sight piece, transparent at least for its major portion and a flexible anatomically shaped body, which is molded in a suitable mold inside which the front piece has been arranged previously. The front piece is provided, along its whole edge portion, with a plurality of through bores, inside which bores, upon molding of said shaped body, the material forming the said body penetrates so as to realize a watertight connection of the front piece and of the body.