Retractable water board fin
AssigneeKransco Manufacturing, Inc.
InventorsDouglas A. Geller, Stephen E. Schneider, William C. Holbrook
Life of this patent
Estimating the term…
Abstract
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.
Claims7
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.
In combination with a water board having a top and a bottom and a given depth,
- means defining a fin-receiving cavity within said board extending between the top and bottom of the board, said means including a casing section having a bottom portion disposed against the bottom of the board and said bottom portion forming the bottom of said cavity,
- a fin received within said cavity, said fin being so proportioned relative to the cavity that it may be essentially fully contained therein,
- an opening in said bottom portion of the casing section bounded by a shoulder and said opening being shaped to permit movement of the fin therethrough,
- rib means integral with said fin disposed within said cavity,
- pivot means pivotally mounting said fin within the cavity for movement of the fin between a first position essentially fully contained within the cavity and a second position wherein the fin extends through said opening to protrude below the base of the board,
- said rib means being positioned on said fin so that on said fin being shifted to its said second position, the rib means engages said shoulder to limit further movement of the fin and stabilize the fin in its second position.
In combination with a water board having a top and a bottom and a given depth,
- means defining a fin-receiving cavity within said board extending between the top and bottom of the board, said means including a casing section having a bottom portion disposed against the bottom of the board and which forms the bottom of said cavity, detachable fastener means detachably securing said casing section to the board accessible from the bottom of the board,
- a fin received within said cavity so proportioned relative to the cavity that it may be essentially fully contained therein,
- an opening in said bottom portion of the casing section shaped to permit movement therethrough of the fin,
- said casing section including upstanding wall portions extending upwardly from said bottom portion, and
- pivot means pivotally mounting said fin on said upstanding wall portions of said casing section, the pivot means accommodating movement of the fin between a first position wherein such is essentially fully contained within the cavity and a second position wherein such extends through said opening and protrudes from the bottom of the board.
Dependencies are inferred from the claim text.