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US 5,176,553 AGranted
Sailboard fin box adapter
OwnerLawrence J. Tuttleinventor
Life of this patent
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OwnerLawrence J. Tuttleinventor
Estimating the term…
A fin box adapter for securing narrow based fins in cavity-type sailboard fin boxes comprising a generally trapezoidal block member having an outer surface configuration corresponding to an inner cavity surface configuration of a cavity fin box, and an inner slot-like cavity for receiving a bottom portion of a modified narrow fin base. In use, a narrow based fin is modified by trimming down any excessive length to fit the inner slot-like cavity and one or more press-fit cross-pins are used to secure the fin base within the inner slot-like cavity of the fin box adapter. A template is used to assist the installer in trimming down the fin base. The top surface of the fin box adapter is provided with one or more threaded holes which cooperate with the existing mounting hardware of the cavity fin box of the sailboard. In an alternate embodiment, a single threaded press-fitted cylindrical block is used in favor of the pins to secure the fin within the slot-like cavity. The block includes a threaded hole which is axially aligned with an existing corresponding hole provided in the center upper surface of the cavity fin box for receiving the mounting hardware used to secure a cavity-type fin within the fin box. Several other embodiments for the outer surface configuration of the fin box adapter are provided to permit use of a universal template cut down fin with different sized cavity boxes currently available.
A cavity fin box adapter for securing a demountable narrow base waterboard fin having a fin base insertable in and removable form a first waterboard fin box having a first slot width and depth dimension to a waterboard cavity fin box having a slot width and depth dimension wider and deeper than said first waterboard fin ox, said cavity fin box adapter comprising in operative combination:
A method for securing a narrow base waterboard fin having a fin base configuration adapted for use with a first fin box having a first width and depth dimension within a cavity fin box having a width and depth dimension wider and deeper than said first fin box comprising the steps of:
A kit for securing a narrow base waterboard fin adapted for use with a first fin box having a first width and depth dimension within a cavity fin box having a width and depth dimension wider and deeper than said first fin box, comprising:
A universal waterboard fin base adapter system for securing waterboard fins of a plurality of fin base configurations to an oversize fin box comprising in operative combination:
Dependencies are inferred from the claim text.