Abstract: The present invention is retractable finned footwear comprising an outsole with retractable fins and a lever used to extend and retract the fins. One end of the fins is rotatably connected at back end of the outsole using fastener, while the other end is extended outside from front side of outsole. The fins can be secured at the bottom of the outsole, to facilitate the footwear suitable for walking on land. The fins can be extended from bottom of outsole by pulling the lever positioned at the back end of the outsole. The extended fins provide forward propulsive thrust to user wearing the footwear in water. After using in water, the lever can be pushed to align and secure the fins in line with the outsole. This facilitates the use of footwear both in water and land.

Abstract: A flipper device that provides a swimmer with functional use of the flipper when fully assembled, and easy, convenient use of same when the swimmer desires to walk in the flipper. In embodiment, the flipper device includes a fin positionable in (i) a swimming orientation in which the fin is configured to aid a swimmer in moving through water, and (ii) a storage orientation in which the fin is configured to be stored differently than in the swimming orientation, wherein the fin is constructed and arranged to be (a) at least partially collapsed in size to a side of the fin when converted from the swimming orientation to the storage orientation, and (b) secured in the storage orientation while collapsed in size to the side when not being used by the swimmer.

Abstract: A swim fin includes a blade and a foot pocket separate from the blade that can be coupled and released. The blade extends in a rearward direction Y2 at both side portions of a rear end of the blade, and has both coupling arms spaced apart in a lateral direction X and both first transverse engaging portions positioned on mutually faced inner surfaces of both coupling arms. A first intermediate engaging portion is positioned between both transverse engaging portions. The foot pocket has both second transverse engaging portions positioned on both side portions of a front end of the foot pocket and detachably engaged with both first transverse engaging portions. A second intermediate engaging portion is detachably engaged with the first intermediate engaging portion.

Abstract: A flipper device that provides a swimmer with functional use of the flipper when fully assembled, and easy, convenient use of same when the swimmer desires to walk in the flipper. In embodiment, the flipper device includes a boot and a fin that is at least partially collapsible, removable from the boot, stored in a substantially vertical orientation on the boot, and secured in its substantially vertical orientation by a securing component. The boot includes a first portion of a fastener, and the securing component. The fin includes a second portion of the fastener that is capable of engaging the first portion of the fastener to removably attach the fin to the boot.

Abstract: A swimming fin comprising a blade extending from a shoe open at its rear side, and a rear heel strap connected to the sides of the shoe by at least one buckle, the buckle having a base plate integral with the shoe. A buckle arm is joined with connected to the strap so as to allow adjustment of the strap's tension, an intermediate lever being connected pivotally to the base plate and the arm. A reversible attachment member is also provided for connecting the intermediate lever to the base plate to achieve closure of the buckle. Between the intermediate lever and the base plate, a disengageable articulation member is provided for reciprocal engagement between them, a pivotal connection, and, at the same time, for allowing their separation in a direction opposite that of tensioning the strap. In this manner, the intermediate lever may be separated from the base plate following release of the attachment member, and disconnection of the disengageable articulation member.

Abstract: An improved amphibious shoe (10) with a swim fin structure which extends for swimming and folds for walking. The amphibious shoe has, in one embodiment, an elastic connection member (27A, 27B) movably connecting the shoe portion (40) of the shoe to the fin portion (20) of the shoe. The elastic connection member maintains the relative positions of the shoe portion and fin portion in a swimming mode and a walking mode. In another embodiment, the shoe portion has a female recess (43A, 43B) for insertion of a corresponding male extension portion (26A, 26B) in the fin portion. Another embodiment includes a locking member (32B, 33B) and a locking plate (34B), wherein the locking plate defines a keyhole slot having a wide portion and a narrow portion, permitting conversion between walking mode and swimming mode when a lateral force is applied.

Abstract: A fin assembly for attachment to the foot covering of a float tube user is disclosed, the foot covering having a sole, a toe portion and a heel portion. The assembly includes a base member having a front portion, a rear portion, an upper surface and a lower surface. A mechanism is provided for releasably attaching the upper surface of the base member to the sole of the foot covering. A fin member is provided and has a front end portion, a rear end portion, a top surface and a bottom surface. A hinge apparatus mounts the front end portion of the fin member to the front portion of the base member so that the fin member is pivotally movable between a retracted position wherein the fin member top surface is positioned proximate the base member lower surface, and a base operational position wherein the fin member rear end portion projects at an angle below the base member lower surface.

Abstract: A swimming auxiliary device includes an attaching member an attaching member mounted to the swimmer's calf or forearm, and a connecting device connected to the attaching member so as to pivotally connect a web member to the attaching member. A pulling device is connected between the web member and the attaching member to pull the web member toward the attaching member. When the swimmer pushes the water, the water flows between the web and the attaching member so that the web member is pivoted away from the by the water. The web member is then pulled by the pulling device to return its original position again when the water flows away from the web member.

Abstract: A diving fin comprises a boot section and a fin section as separate parts which are held in an assembly by a supportive or hinge structure incorporated in the forefront of the boot section and a rear edge of the fin section. The hinge structure comprises an axle or shaft within axially aligned cylindrical sleeves with the shaft coupled to the fin section so that raising or lowering of the fin relative to the boot section is performed by manual manipulation of the fin section. A latch is incorporated in the hinge for detachably securing the fin both in a raised position relative to the boot section and in a lowered position projecting forwardly from the boot section. The latch comprises a fixed radial projection on the shaft engageable with slits formed in one of the sleeves. The slits comprise a circumferentially extending portion that at opposite ends has arcuately spaced apart axially oriented latch slit portions defining the two latched positions of the fin.

Abstract: A fin assembly is disclosed for attachment to a boot of a float tube user, the boot having a sole, a toe and a heel. The assembly includes a base member having a mechanism for attachment to a boot. The base member has a front portion for attachment proximate the toe of the boot and a rear portion for attachment proximate the heel of the boot. A fin member is provided with front and rear ends. A mechanism is provided for pivotally mounting the front end of the fin member to the front portion of the base member.

Abstract: A swim fin for use in a swimming mode and in a walking mode has a boot portion including a shoe having a foot receiving pocket and a bulbous connecting member. Three tracks are formed in the connecting member terminating in a cavity at each end of each track, the cavity at one end being disposed substantially parallel to the axis of elongation of the foot receiving pocket and thus the foot of a swimmer and the cavity at the other end of each track being disposed approximately 90.degree. to the axis of the foot receiving pocket. The fin also includes a web having fingers adapted to be received in the cavities at one end of the tracks or in the cavities at the other end of the tracks selectively when the web is positioned in the swimming mode or the walking mode. The web also carries pins which are resiliently connected to the boot portion of the fin and positioned within a guideway in the connecting member. The configuration of the guideway is such as to urge the fingers into one or the other sets of cavities.

Abstract: A swimming flipper having separated shoe (1) and fin (2). The flipper consists mainly of a shoe (1) and a fin (2), a hinge (7) which connects the bottom portion of the shoe (1) with the front portion of the fin (2) and allows the shoe (1) to rotate with respect to the fin (2). The flipper further comprises: a strap orienting member (4) and two buckles (3), a strap (5) passing through the strap orienting member (4) and the two buckles (3), two flexible members (6), with one end of each flexible member (6) connected to the rear surrounding portion of the fin (2) and the other end connected to a corresponding buckle (3). While swimming an angle is made between the shoe (1) and the fin (2) so that users can exert force with the sole of the feet instead of tiptoes as with conventional flippers.

Abstract: Improved swimming efficiency and safety in a water environment is achieved with the use of retractable swim fins having a web-like member rotatably interconnected to a shoe-like member. A latch includes a latch element which secures the web-like member to the shoe-like member in a downward swimming position. The latch element is released by linear pressure from the other foot to permit the web-like member to rotate in response to a spring force to an upward walking position. A natural swimming kick returns and latches the web-like member to the swimming position.

Abstract: A swimming shoe composed of a shoe body, several water-resisting flanges and an attached swimming-assistance device. The shoe body has the shape of a sandal which has a shoe bottom, a shoe surface, two fixing plates and a fastener. In the vamp of the shoe there are two fixing sets which both have a fixing set and a button to attach the water-resistant flange. In the shoe body, the fixing plate can hold the swimming-resisting device. This new device will not interfere with walking on land and also can be used as an aid to help the swimmer to swim faster.

Abstract: Improved swimming efficiency and safety in a water environment is achieved with the use of retractable swim fins having a web-like member rotatably interconnected to a shoe-like member. Latching means secure the web-like member to the shoe-like member in a downward swimming position. Releasing means permit the web-like member to rotate to an upward walking position. Pressure from a swimmer's foot returns and latches the web-like member to the downward position.

Abstract: A swim fin includes a foot receptacle for attaching to a swimmer or diver's foot. A pair of parallel beam supports are secured to the foot and toe portion of the foot receptacle and support a plurality of hydrofoil blades therebetween in a pivotal attachment. Limits are provided to restrict the pivotal motion of the hydrofoil blades to provide an optimum angle of attack for the hydrofoil blades during the swimming stroke.

Abstract: A swim fin includes harness for attachment to a wearer's foot, the harness including an adjustable strap secured to the fin on opposite sides of a forward portion of the wearer's foot, the adjustable strap forming an X configuration passing over the wearer's instep and around the wearer's heel. Liner straps are arranged between forward portions of the adjustable strap and the wearer's foot while lateral straps are anchored to rearward portions of the fine and secured to opposite side portions of the adjustable strap. The fin has a generally flat configuration with one or more flanges extended beneath the wearer's foot and along forward portions of the fin for controlling the amount of bending or flexing experienced by the fin.

Abstract: The improvement provided by this invention is directed at the conventional beach-shoe and diving flipper, and according to this invention, a novel beach-shoe capable of acting as a diving flipper is provided. The web portion is extensible relative to a shoe body, the shoe can be used as a beach-shoe when a web member is received in a recess of the shoe body, and a guarding piece is placed in a cut-out made in the front end of the shoe body to admit the web member to pass through.