A pivoting fin used to control the movement of a surfboard. The pivoting fin is provided with a rotatable hinge allowing the fin to rotate in the “roll” axis of the surfboard. The rotatable hinge is inserted into base position which in turn is secured to the underside of the surfboard.
대표청구항▼
1. An assembly for pivotally attaching a fin in the roll axis with respect to a surfboard, the assembly comprising: a rotatable hinge attached to the bottom of the fin;a hollow base portion attached to the bottom of the surfboard, said hollow base portion provided with an opening on one end into whi
1. An assembly for pivotally attaching a fin in the roll axis with respect to a surfboard, the assembly comprising: a rotatable hinge attached to the bottom of the fin;a hollow base portion attached to the bottom of the surfboard, said hollow base portion provided with an opening on one end into which said rotatable hinge is longitudinally inserted; anda mechanism for movably attaching said rotatable hinge to said hollow base portion, said mechanism comprising a hollowed-out portion in said rotapble hinge, a bushing movably secured in said hollowed-out portion, and a first fastener connecting said hollow base portion to said bushing; whereinwhen hydrodynamic force is applied to one side of the fin, the fin will rotate in the roll axis due to rotatable movement of said rotatable hinge within said hollow base portion. 2. The assembly in accordance with claim 1, wherein said bushing is provided with a hole into which said fastener is inserted. 3. The assembly in accordance with claim 2, wherein both said fastener and said hole are threaded. 4. The assembly in accordance with claim 1, wherein said rotatable hinge is provided with a longitudinal projection and said hollow base portion is provided with a longitudinal slot, wherein said longitudinal projection is accommodated within said longitudinal slot. 5. The assembly in accordance with claim 4, further including short projections provided in said hollowed-out portion for constraining the rotatable movement of said bushing between two extreme positions. 6. The assembly in accordance with claim 4, wherein said bushing is constructed from an elastomeric rubber material for dissipating the energy of said bushing as it moves between said two extreme positions. 7. The assembly in accordance with claim 1, wherein said mechanism includes a slot provided in said rotatable hinge and a second fastener connecting said hollow base portion to said slot of said rotatable hinge, said second fastener passing through a hole provided in said hollow base portion. 8. The assembly in accordance with claim 7, wherein said rotatable hinge is provided with a longitudinal projection and said hollow base portion is provided with a longitudinal slot, wherein said longitudinal projection is accommodated within said longitudinal slot. 9. The assembly in accordance with claim 8, wherein said rotatable hinge includes a cavity at one end of said longitudinal projection, and further wherein one end of said longitudinal slot is provided with an extension portion, said extension portion inserted into said cavity when said rotatable hinge is fully inserted into said hollow base portion. 10. The assembly in accordance with claim 9, wherein said extension is approximately 0.1 inch in length. 11. The assembly in accordance with claim 7, wherein said slot, said fastener and said hole are threaded. 12. The assembly in accordance with claim 1, wherein one end of said rotatable hinge is provided with a slot, and further wherein an elastomeric material is provided in said slot. 13. The assembly in accordance with claim 1, wherein said fastener is a pin, dowel or rivet. 14. The assembly in accordance with claim 7, wherein said fastener is a pin, dowel or rivet. 15. The assembly in accordance with claim 1, wherein said fin rotates in the range of 0° to 14°. 16. An assembly for pivotally attaching a fin in the roll axis with respect to a surfboard, the assembly comprising: a rotatable hinge attached to the bottom of the fin;a hollow base portion attached to the bottom of the surfboard, said hollow base portion provided with an opening on one end into which said rotatable hinge is longitudinally inserted; anda mechanism for movably attaching said rotatable hinge to said hollow base portion, said mechanism including a slot provided in said rotatable hinge, and a fastener connecting said hollow base portion to said slot of said rotatable hinge, said fastener passing through a hole in said hollow base portion; whereinwhen hydrodynamic force is applied to one side of the fin, the fin will rotate in the roll axis due to rotatable movement of said rotatable hinge within said hollow base portion. 17. An assembly for pivotally attaching a fin in the roll axis with respect to a surfboard, the assembly comprising: a rotatable hinge attached to the bottom of the fin, one end of said rotatable hinge provided with a slot;an elastomeric material provided in said slot;a hollow base portion attached to the bottom of the surfboard, said hollow base portion provided with an opening on one end into which said rotatable hinge is longitudinally inserted; anda mechanism for movably attaching said rotatable hinge to said hollow base portion; whereinwhen hydrodynamic force is applied to one side of the fin, the fin will rotate in the roll axis due to the rotatable movement of said rotatable hinge within said hollow base portion.
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이 특허에 인용된 특허 (8)
Pope Karl D., Fin attachment system allowing roll angle alignment.
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