초록 ▼

A generally trapezoidal fin (22) is pivotally fastened to a casing which can receive the entire fin, permitting total retraction of the fin. The casing is formed with at least one notch (42) for selectively positioning the fin relative to the casing. In a preferred embodiment, the fin is operated by

A generally trapezoidal fin (22) is pivotally fastened to a casing which can receive the entire fin, permitting total retraction of the fin. The casing is formed with at least one notch (42) for selectively positioning the fin relative to the casing. In a preferred embodiment, the fin is operated by a lever member (26) which has a knob (50) at its distal end for use in positioning the fin (22) from above.

대표청구항 ▼

The combination of a retractable fin assembly mounted within a water board, the water board having a top and a bottom and a given depth, said assembly comprising: a casing including a hollow body having a cavity defined therein and said body having a depth equal to or less than that of the board, sa

The combination of a retractable fin assembly mounted within a water board, the water board having a top and a bottom and a given depth, said assembly comprising: a casing including a hollow body having a cavity defined therein and said body having a depth equal to or less than that of the board, said casing body having a top and a bottom and there being a fin-receiving opening defined through the bottom of the casing; said casing further having first and second flanges secured to the top and bottom of said casing body extending laterally of said casing body and engaging the top and bottom of the board with the board sandwiched between said flanges, said casing including one section having said first flange and another section separable from the one section having said second flange and the assembly further including detachable fastener means securing said one and said other sections together, removal of said fastener means and separation of the sections permitting the casing to be extended through the board, a fin receiving within the cavity, said fin being so proportioned relative to the casing that it may be fully contained therein; means mounting the fin within the casing for select movement between a first position fully contained within the casing and a second position extending from the fin-receiving opening of the casing; and detent means to selectively lock the fin body in said respective first and second positions.