Leg fin

Claim 1

AN AQUATIC APPLIANCE EXPRESSLY DESIGNED AND ADAPTED TO AID A SWIMMER TO LAUNCH HIMSELF INTO MOTION IN A BODY OF WATER AND TO THEREAFTER PROPEL HIMSELF, UNDER WATER IF SO DESIRED, SAID APPLIANCE COMPRISING: A MOLDED ONEPIECE UNIT EMBODYING A SUBSTANTIALLY RIGID ELONGATED BAR-LIKE MEMBER RECTANGULAR IN TRANSVERSE CROSS-SECTION AND CONSTITUTING AND PROVIDING A LEG BRACE, SAID LEG BRACE HAVING A LENGTHWISE INWARD FLAT SURFACE WHICH, WHEN IN USE, RESIDES FIRMLY IN CONTACT WITH A LENGTHWISE OUTWARD SURFACE OF THE USER''S LEG, SAID LEG BRACE BEING PROVIDED AT A LOWER END PORTION THEREOF WITH A COMPLEMENTAL PORTION EXTENDING AT RIGHT ANGLES THEREFROM AND TERMINATING AT AN INWARD END IN AN UPSTANDING TERMINAL PORTION WHICH IS OPPOSED TO AND PARALLEL WITH THE COOPERATING LOWER PORTION OF THE BRACE, SAID PORTIONS COOPERATING WITH EACH OTHER AND SAID BRACE IN DEFINING A FOOT EMBRACING AND SEATING STIRRUP, A LEG ENCIRCLING STRAP HAVING AN INTERMEDIATE PORTION THEREOF FORMED INTEGRALLY WITH THE EXTREME UPPER END OF SAID BRACE, AN ANKLE ENCIRCLING STRAP HAVING AN INTERMEDIATE PORTION THEREOF FORMED INTEGRALLY WITH A PORTION OF SAID BRACE WHICH IS ADJACENT TO AND COOPERABLE WITH SAID STIRRUP, SAID ANKLE STRAP HAVING CONNECTIBLE FREE END PORTIONS WHICH ARE SEPARABLY CONNECTIBLE WITH A TERMINAL END OF THE AFOREMENTIONED UPSTANDING TERMINAL PORTION, AND A STATIONARY LEG FIN COMPRISING A VANE WHICH IS SUBSTANTIALLY RIGID AND DESIGNED AND ADAPTED FOR VERTICAL DISPOSITION AND BEING OF A LENGTH COMMENSURATE WITH THE LENGTH OF THE BRACE AND HAVING A LINEARLY STRAIGHT INWARD LENGTHWISE EDGE INTEGRALLY FIXED TO A MEDIAN PORTION OF THE LENGTHWISE OUTER SURFACE OF SAID BRACE, SAID VANE BEING SEGMENTAL-SHAPED IN FRONT AND REAR ELEVATION, HAVING A LOWER END PORTION DISPOSED AT RIGHT ANGLES TO THE PLANE OF THE BRACE AND TERMINATING IN A PLANE GENERALLY THE SAME AS THE PLANE OF SAID STIRRUP COMPLEMENTAL PORTION, SAID VANE BEING WIDE AT THE MEDIAN AND BOTTOM PORTIONS AND SHARPLY DECREASED IN WIDTH TO A MINIMAL DIMENSION AT AN UPPER END PORTION, SAID VANE HAVING FLAT FRONT AND REAR SURFACES PROVIDED WITH SPACED PARALLEL VERTICALLY SPACED REINFORCING RIBS, SAID RIBS HAVING INWARD END PORTIONS THEREOF INTEGRATED WITH THE OUTER SURFACE OF THE BRACE AT THE POINT OF CONNECTION OF THE BRACE WITH THE INNER EDGE PORTION OF THE VANE, THE OUTER ENDS OF SAID RIBS TERMINATING SHORT OF AND BEING SPACED INWARDLY FROM AN OUTER MARGINAL EDGE OF THE VANE.