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US 5,480,331 AGranted
Flexible surfboard fin
AssigneeJohn R. Nickel
InventorTommy R. Lewis
Life of this patent
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Abstract
A flexible fin for surfboards, sailboards and other watercraft comprises a thin core sheet made of laminated fiberglass sandwiched between two slabs of closed-cell polyurethane foam. The flexible fin provides for sharper turns while increasing the buoyancy of the craft.
Claims8
A resiliently flexible fin or keel for use on watercraft which comprises:
- a flat core sheet having limited lateral resilient flexibility, said sheet having a right face and a left face, said core sheet being limited by a mounting side and a peripheral edge extending from fore to aft;
- a first slab of resiliently compressible material bonded to said right face;
- and
- a second slab of resiliently compressible foam material symmetrical to said first slab bonded to said left face.
1 more element
Dependencies are inferred from the claim text.