The present invention relates generally to rudder and steering systems for water-born vessels and more particularly to rudder systems for sailboats, wherein the rudder is capable of being raised to a stowed position or lowered to a steering position as required. The preferred embodiment relates to transom-mounted (externally mounted), sailboat “kick-up” rudders that allow upward pivoting of a rudder upon grounding, to help protect the rudder and boat from damage.
Sailing technology has existed for millennia and there are numerous variations on sailboat rudders. More specifically, there exist numerous sailboat rudders that are retractable in nature.
Retractable rudders are useful for passing a boat through shallow water in order to prevent the rudder from running aground and being damaged. Alternatively, if a rudder is retractable and it accidentally strikes a surface under water, the rudder may release upward from the downward position so that it is not damaged. Retractable rudders also enable the operator of the craft to lift the rudder from under the stern in order to place the boat on a trailer.
Often the design of such retractable rudders requires that the rudder be attached to a rope or other retraction means for manually retracting the rudder. In order to retract the rudder, the rope must be pulled and the rudder lifted from the water. This type of design is problematic for a number of reasons. The first reason being that the rudders are usually heavy and require significant strength and attention from the operator or crew of the sailboat to retract the rudder. Retracting the rudder may distract the operator or crew of the boat from other important duties or events occurring in the craft. A second reason that a conventional retractable rudder is problematic is that once the rudder is retracted it must be tied off or cleated so that it remains in the retracted position and does not drop back into the water. Cleating a retractable rudder takes additional time, effort, and attention of the operator or crew of the boat. Additionally, if a rudder is cleated and an urgent need for control of the craft arises, it takes a significant amount of time and effort to release the rudder back into the water. Due to the often rapid pace of events in a moving sailboat, any time saved may be crucial in preventing catastrophic errors.
Other retractable rudders that are known to the art are designed so if the sailboat runs into shallow water or the rudder strikes an underwater object, the rudder will kick up. However, this design may be problematic if the rudder is held by a friction mounting. A friction mounting allows a rudder that strikes an underwater object to yield to the underwater object, but the rudder will remain in a displaced or elevated position above or near the surface of the water. In order to move the rudder back into the water, an operator or crew member on the sailboat must manually push the rudder back into the water. This takes time and strength that may be needed in the craft. Additionally, if the rudder is stuck in an elevated position above or at the surface of the water the sailboat will have little or no control. A second problem may arise if the rudder is extended to the rearward from the transom or stern of the craft. In such a case, an increased amount of force is placed on the rudder mounting and the tiller arm when the rudder is in this position. If the rudder strikes an object or control of the boat is attempted with the rudder extended horizontally on the surface of the water, the force exerted on the rudder mounting may be great enough to tear the mounting from the transom of the sailboat or cause the tiller arm to fracture. Either of these events may cause catastrophic consequences because of loss of control of the sailboat.
The present invention relates generally to rudder systems used to steer water-born vessels, and more specifically, to rudder systems used on sailboats.
The preferred rudder system is designed to be pivotally mounted upon the transom of a vessel and provides a mechanism wherein the rudder may be raised to a secured position or lowered to an employed “steering” position as desired by the boater. The rudder may pivot greater than 90 degrees, and preferably approximately 180 degrees, between the steering position and secured position. The invented mechanism for raising and lowering the rudder may be called a “one-pull” system. A single pull of an uphaul line, such as a cord or cable, may be effective in raising the rudder to the secured position, and a single pull of the same uphaul line may be effective in lowering the rudder to the steering position. A pneumatic/gas cylinder or “strut” may be used to dampen the rudder movement between the steering and secured positions, may assist in raising and lowering the rudder, and may help retain the rudder in the desired position once the rudder has been raised or lowered.
The aforementioned rudder system is preferably constructed of suitably strong, lightweight, corrosion resistant, waterproof materials such as, but not limited to, plastics (polymers), stainless steel and aluminum. The preferred gas cylinder has a stainless steel housing.
The preferred embodiment is comprised of a generally vertical member, said member containing appropriate mounting bearings and fasteners for attachment to the vessel. Upon the lower end of the vertical member, a pivotal mounting structure is provided, wherein the rudder is installed. Protruding forwardly from and perpendicular to the upper end of the vertical member, a tiller bar is provided to rotate the vertical member and rudder to accomplish steering of the vessel. In alternative embodiments, the rudder system may be operatively connected to a steering wheel rather than a tiller bar.
To facilitate movement of the rudder from a secured, upright position to a lowered, “employed” or “steering” position, a cable and pulley system and gas cylinder are provided in the preferred embodiment wherein the boater may accomplish the desired movement using just one pull (for each of the lowering and the raising functions) and preferably just one hand. When the rudder is in the lowered, steering position, should the rudder inadvertently strike an underwater object, the aforementioned system allows rotational movement of the rudder sufficient to clear said underwater object, thereby preventing damage to the rudder, the preferred gas cylinder system provides a bias that returns the rudder to the employed position when the rudder is free from the underwater object.
The purpose of the foregoing Abstract is to enable the public, and especially the scientists, engineers, and practitioners in the art who are not familiar with patent or legal terms or phraseology, to determine quickly from a cursory inspection, the nature and essence of the technical disclosure of the application. The Abstract is neither intended to define the invention of the application, which is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.
Still other features and advantages of the present invention will become readily apparent to those skilled in this art from the following detailed description describing preferred embodiments of the invention, simply by way of illustration of the best mode contemplated by carrying out my invention. As will be realized, the invention is capable of modification in various obvious respects all without departing from the invention. Accordingly, the drawings and description of the preferred embodiments are to be regarded as illustrative in nature, and not as restrictive in nature.
While the invention is susceptible of various modifications and alternative constructions, certain illustrated embodiments thereof have been shown in the drawings and will be described below in detail. It should be understood, however, that there is no intention to limit the invention to the specific form disclosed, but, on the contrary, the invention is to cover all modifications, alternative constructions, and equivalents falling within the spirit and scope of the invention as defined in the claims.
Until now, the boat industry has seen a long and unresolved need for a retractable rudder system that allows the operator of a boat to raise and lower a rudder with minimal effort and ease, while also allowing the rudder to have a security mechanism that allows the rudder to yield to underwater obstructions.
The present invention is a retractable sailboat rudder that is moveable from the up or secured position to the down or employed position or from the down to the up position with minimal effort. This functionality is accomplished by an uphaul line and pulley system coupled with a gas filled cylinder (“compressible resistance member”). The uphaul line is pulled to initiate both the upward and the downward movement, thereby improving the ease and simplicity of use over prior designs. Additionally, the gas filled cylinder both assists in the raising and lowering of the rudder and allows the rudder to yield to underwater obstructions that the rudder might strike while the boat is in motion. This functionality allows the rudder to raise as it contacts the object and automatically return to the steering position once the boat has passed the object.
In the following description and in the figures, like elements are identified with like reference numerals. The use of “or” indicates a non-exclusive alternative without limitation unless otherwise noted. The use of “including” means “including, but not limited to,” unless otherwise noted.
Referring to the Figures, there are shown several, but not the only, embodiments of the invented rudder system used to steer a boat while underway upon water. The rudder system may be used on a boat during motor and/or sail and/or drifting, and may be adapted for use with a tiller arm and/or a steering wheel. Preferably, the invented rudder system is a transom-mounted system, but other mounting, construction, and installation systems may be used.
Referring now to
Referring now to
Operation of the rudder system 10 will now be discussed, beginning with the rudder 12 in the upright, secured position.
Referring now to
The force exerted downwardly by the pressure within gas cylinder 50 while in this position, indicated by arrow F1, tends to keep rudder 12 in the upright position. When the boater desires to lower the rudder 12, cable 38 at handle 48 is grasped and pulled toward the forward end of the boat. When sufficient force through cable 38 is exerted by the boater, indicated by arrow F2 (and which is applied by the cable 38 being pulled forward on the boat in view of the cable 38 changing directions via eye 46), the force F1 exerted by gas cylinder 50 is overcome. Force F2 acts upon pulley 40 affixed to rudder 12 with stud 41, in view of end 42 of cable 38 being fixed to rudderpost 14, to pivot the rudder outward.
As Force F2 pivots the rudder outward, lower end 54 of gas cylinder 50 then begins to move upwardly and rearwardly, sliding within slot 56, and rudder 12 rotates rearwardly and downwardly. Upon continued force F2, still exerted by the boater pulling forward on the handle 48, lower end 54 of gas cylinder 50 rotates through approximately 90 degrees of arc in slot 56, rudder 12 rotating a corresponding 90 degrees. Through this position, the gas cylinder 50 is being shortened, and Force F1 is working against the boater pulling on the handle/cable, but Force F2 overcomes F1 with the assistance of the pulley. Note that pulley 40, in
Upon reaching the zenith (“intermediate zenith slot position”) of slot 56 at approximately 90 degrees of rotation, the lower end 54 of gas cylinder 50 begins to travel downwardly in slot 56 (lengthening as it travels through the left half of the slot 56 in
While the boat is underway, should the rudder strike an underwater object such as rocks or a sand bar, the rudder 12 is free to rotate upwardly to clear said object, thereby preventing rudder damage. Upon clearing said object, the rudder 12 will automatically return to the fully lowered steering position, as it is biased into this position by the gas cylinder.
When the boater desires to return the rudder 12 to the upright, secured position, force is exerted by the boater forwardly through handle 48 and cable 38, thereby overcoming force exerted by gas cylinder 50 at F3. Lower end 54 of gas cylinder 50 begins travel upwardly and forwardly in slot 56 and rudder 12 begins rotation upwardly and forwardly. Having traveled through 180 degrees of arc (generally in the reverse of the description above) rudder 12 now resides in the up position and lower end 54 of gas cylinder 50 comes to rest at end 56A of slot 56, as shown in
Thus, in both the lowering and raising of the rudder, the same cable 38 pulled the same direction is used to overcome the forces of the gas cylinder and/or the rudder weight, but once the gas cylinder lower end has moved over the “crest” of its rotation, it assists with the rudder movement into the desired position. Further, the gas cylinder provides a dampening effect, because of its bias (F1 and F3) so that the rudder movement is made smoother and does not tend to “slam” into either position. Alternative biasing means may be used, such as other cylinders or struts, springs, or elongated elastic members, but the gas cylinder is preferred because of its consistency of operation, its aesthetics, and its durability.
Referring now to
Referring now to
Preferred embodiments of the invention, therefore, may be described as a system for raising a rudder more than 90 degrees from its employed position, and preferably approximately 180 degrees. The system for raising and lowered the rudder may be a one-pull, single line system, which does not require separate lines/cables for raising and for lowering the rudder. The preferred system utilizes a pulley and cable properly placed so that, when the rudder is already raised, pulling on the cable pivots the rudder outward and downward, and so that, when the rudder is already lowered, pulling on the same cable preferably in the same direction pivots the rudder upward and inward. This provides and comfortable, easy to operate, and one may even say elegant, apparatus and method of controlling the level and position of the rudder. Further, in transom-mounted embodiments, the post and its system for connection to the boat may be easily adapted for different sizes, styles, and types of boats.
The preferred embodiments may be described as a manually-raised and manually-lowered rudder system, which preferably includes a cylinder (piston) but most preferably only a self-contained cylinder/piston (rather than one that is powered or controlled by a separate fluid, gas, or other actuation system). The simple and effective one-pull cable/pulley system preferably utilizes a single cable and a single pulley, so that a single cable extends from a handle, around a single pulley, and then to an anchor point. This may be differentiated from a complex cable system, with multiple cables and multiple cable portions extending many different directions and/or having multiple handles.
Although this invention has been described above with reference to particular means, materials, and embodiments, it is to be understood that the invention is not limited to these disclosed particulars, but extends instead to all equivalents within the scope of the Description, Drawings, and Photographs.
The exemplary embodiments shown in the figures and described above illustrate but do not limit the invention. It should be understood that there is no intention to limit the invention to the specific form disclosed; rather, the invention is to cover all modifications, alternative constructions, and equivalents falling within the spirit and scope of the invention as defined in the claims. While there is shown and described the present preferred embodiment of the invention, it is to be distinctly understood that this invention is not limited thereto but may be variously embodied to practice within the scope of the following claims. From the foregoing description, it will be apparent that various changes may be made without departing from the spirit and scope of the invention as defined by the following claims.
This application claims the priority date of the provisional application entitled “Sailboat Rudder” filed by Joel F. Santarone on Nov. 3, 2006 with application Ser. No. 60/856,418.
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Number | Date | Country | |
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20080105183 A1 | May 2008 | US |
Number | Date | Country | |
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60856418 | Nov 2006 | US |