Patent Nr. 20130103133
The main objective of this Patent lies in the innovation of a keel which may be extended under the boat by means of a stainless steel cable, and then retracted when sailing in shallow waters, or to refloat the boat when stranded on small sandbars, by partially lifting the keel.
DESCRIPTION
Unlike the traditional keel which is introduced in the hull, and does not totally compensate the lateral wind forces on the sails (as it is generally a rectangular sheet), the retractable keel meets its objective of stabilizing the boat with less weight. This retractable keel does not weaken the hull, as is the case with the conventional keel due to the opening in the cockpit floor to lodge it, and does not surrender valuable space in the cockpit.
CLAIMS
A system of retractable keel for sailing boats operated only by a reduction winch. Retractable keel suspended by two bars with a slight curve to enable them to be placed horizontally under the keel when retracted. These bars have no articulation, which increases their rigidity and useful life.
FIGURE 1
View A
Shows a sailing boat with retractable keel suspended under the hull, operated only by a reduction winch (C) above the waterline, which raises and lowers the retractable keel suspended by a stainless steel cable (D) under the waterline, with a seal and watertight cover on the output shaft, and a separate hand crank to raise and lower the retractable keel.
Retractable keel under the hull with retracted bars operated by the lower teflon rollers (R).
View B
Retractable keel extended in its stabilizing function, exerting maximum counterweight. The stainless steel cable is no longer tense as the keel remains firmly in its place by the crossed bars (T).
FIGURE 2
View C
Retractable keel under the hull with the bars closed by means of the lower teflon rollers (R).
(-1-2-) Ideal measurements to accommodate the bars under the keel (they are maintained by modules).
View D
Retractable keel operating as counterweight suspended by the stainless steel bars (B).
View E
Ideal shape of the keel in the form of a dirigible with two teflon rollers which serve as guidings to the bars (B). On the left side is the fork, attached to the hull.
View F
Extended bar under the hull with the reinforcements (H) which prevent lateral shift of the keel. In the lower part the teflon rollers can be seen within the keel, and to the right the ideal curve for the bars (B).
(T) In all the figures, the crossing bar which holds the keel
(L) In all the figures, the sphere which holds the keel
See movement as operated by the winch
For questions, suggestions or comments via Mail
atilio.stockert@yahoo.com.ar
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