Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7926435 | Spade rudder Disclosed herein is a spade rudder, which is intended to relieve bending moment generated by a rudder, and to suppress vibrations generated from the rudder due to a propeller, in the case of a large ship. The spade rudder has a rudder stock for rotating a rudder, an... | 04/19/2011 |
| 7717052 | High performance rudder for ships A high performance full spade rudder for ships includes a rudder blade, a rudder trunk and a rudder post. The rudder blade widens from the leading edge to a central area which constitutes the widest point of the rudder profile. The rudder blade profile tapers from t... | 05/18/2010 |
| 7430976 | Twist and stow rudder A retraction system for rudders for small boats having a deck comprising a rudder means connecting said rudder to the rear of a boat enabling said rudder to pivot on an axis such that when the rudder is retracted, ... | 10/07/2008 |
| 7018252 | Watercraft control mechanism A watercraft includes a watercraft control mechanism that is capable of steering, decelerating, and/or trimming a watercraft without causing the stern to elevate and the bow to dive; steers or assists steering in off-power situations; steers, trims and/or decelerate... | 03/28/2006 |
| 6739276 | Replaceable, reflecting kayak rudder system with pedal and trim adjusting features An improved rudder system and pedal system for use in a watercraft such as a kayak. The rudder assembly includes a rudder housing having a push rod operably linked to a rudder blade positioned in the housing. A rudder control cord passes through a fairlead located a... | 05/25/2004 |
| 5676079 | Reduced drag rudder for tiller steered sailboats An improved rudder for tiller steered sailboats is disclosed wherein a rudder support member is rotatably mounted on an axial support located substantially at the waterline in the aft central portion of a boat. A rudder support guide or track is preferabl... | 10/14/1997 |
| 5555837 | Boat stabilizing rudder system A boat stabilizing rudder system is disclosed. A rudder is formed of planar sheet material positionable in a vertical orientation. A vertically positioned support rod has a lower end, an upper end and an elongated central extent therebetween. The lower en... | 09/17/1996 |
| 5447113 | Rudder A rudder assembly for a boat in which a rapid pivotal displacement of the tiller from a first position to a second position displaces the rudder into either a raised or a lowered position, and which comprises a biased locking means for releasably retainin... | 09/05/1995 |
| 5056451 | Rudder construction with integral stock A method of constructing a rudder comprises the steps of producing two female moulds each having the shape of half the rudder and stock, moulding in each mould one half of the blade and stock portions (11, 12) of the rudder, removing the moulded halves fr... | 10/15/1991 |
| 5046441 | Rudder mechanism for ship A rudder mechanism for a ship comprises a support bearing fixed to the bottom of a stern of the ship, a rudder shaft with one end rotatably supported by the support bearing, a swayable shaft member connected to the other end of the rudder shaft, and a rud... | 09/10/1991 |
| 4924791 | Adjustable sailboard A sailboard including hull, mast and rigged sail assembly and a foot operated rudder pivotally and rotatably mounted to the stern of the hull, with the rudder being adjustable longitudinally to the different heights of sailboard users while maintaining th... | 05/15/1990 |
| 4867092 | Rudder assembly A rudder assembly for use on a sailing vessel is disclosed wherein the rudder is bifurcated into a pair of downwardly diverging rudder vanes rotatably mounted on support arms extending transversely of the tiller post. As the sailing vessel is tipped sidew... | 09/19/1989 |
| 4807553 | Retractable rudder for light-weight trolling motor propelled fishing boat A light-weight fishing boat is provided including an electric trolling motor mounted from one end portion thereof for actuation and steering control thereof by a fisher person disposed on the boat hull and the other end of the boat hull supports a station... | 02/28/1989 |
| 4771723 | Sailboard assembly having a foot-operable steering assembly A sailboard assembly is disclosed which has a body on which the user stands, a mast, boom and sail assembly for propulsion of the board. The mast-boom-sail assembly is mounted to the board by a mast mounting assembly which permits limited angular displace... | 09/20/1988 |
| 4711192 | Rudder assembly A rudder assembly for sailboats which comprises a rudder support frame, a rudder blade, a tiller frame, a pivot bracket, and a lever. With the rudder blade in the lowered position, the weight of the tiller arm bears down on the pivot at the junction of th... | 12/08/1987 |
| 4591343 | Walker-sailor watercraft A walker-sailor watercraft which can be used for either walking or sailing on the surface of a body of water includes separate right and left walker members, each walker member including a foot cavity, a support member, a hollow seat member and a storage ... | 05/27/1986 |
| 4584957 | Multi-hull sailing vessel with variable lift A double-ended two hull sailing vessel has a main hull and an auxiliary hull, where the distance between the auxiliary hull and the main hull can be varied for controlling heel. The mast is supported on a curved track for varying the angle of the mast rel... | 04/29/1986 |
| 4582012 | Inflatable hull structures and demountable joint between elongated structural elements A demountable catamaran has a pair of inflatable hull structures each comprising an inflatable hull tube (4) and an extruded generally rectangular aluminium tubular beam (5) having at its lower surface two inclined support surfaces on opposite sides of a ... | 04/15/1986 |
| 4562784 | Sailing craft A sailing craft having hydrodynamically shaped catamaran hulls and tapered configuration rudder assemblies attached to each hull. Low draft keels are attached to the fore one-half bottom portions of the hull and a pitch-sensitive variable camber mast and ... | 01/07/1986 |
| 4506621 | Tiltable rudder A tilting rudder for conversion of a sailboat. The rudder pivots upwardly into concealment in a trunk located somewhat forward of the transom in the cockpit of a sailboat. A seal closes the trunk when the rudder is concealed and opens when the rudder is p... | 03/26/1985 |
| 4463699 | Sailing craft A sailing craft having hydrodynamically shaped catamaran hulls and tapered configuration rudder assemblies attached to each hull. Low draft keels are attached to the fore one-half bottom portions of the hull and a pitch-sensitive variable camber mast and ... | 08/07/1984 |
| 4463700 | Rudder for watercraft The invention relates to a rudder for watercraft with a stabilizer (13) articulated to the rudder blade (11), the stabilizer and the rudder blade being connected in articulated manner by articulated blades and several connecting bolts. The in each case up... | 08/07/1984 |
| 4406239 | Sailboats, especially catamarans A sailboat of the catamaran type has a pair of hulls joined by a pair of wedge shaped crossbeams, the crossbeams geometry being oriented to provide balanced distribution of loading on the hulls and crossbeams. An easily dismantable, multipart mast is step... | 09/27/1983 |
| 4372241 | Rudder assembly A rudder assembly for sail boats and the like comprising a rudder support frame pivotally attached to the stern portion of the boat, a substantially horizontal tiller fixedly attached to the upper portion of the rudder support frame, a rudder blade pivota... | 02/08/1983 |
| 4319538 | Kickup rudder assembly having roller detent A rudder assembly for a sailing craft comprising a housing adapted to be pivotally mounted on the stern of the craft for rotation about a substantially vertical axis, and a rudder pivotally mounted in said housing for rotation about a substantially horizo... | 03/16/1982 |
| 4286536 | Removable rudder assembly A removable rudder assembly for a boat includes a generally key-hole shaped rudder lock member which is adapted to fit into a key-hole shaped slot in the keel of the boat adjacent the stern. A rudder shaft extends through the rudder lock member, and a rud... | 09/01/1981 |
| 4231309 | Rudders for boats, particularly for pleasure boats A boat rudder comprises a rudder-blade hinged in its upper part to a substantially horizontal pin carried by a rudder-blade support, which support is hinged to a substantially vertical pin. The boat rudder further comprises a bar fixed to a bar support th... | 11/04/1980 |
| 4230295 | Device to support rudders and trailing edge flaps of aircraft and watercraft A supporting device is disclosed for an arrangement of articulated elements such as a fin-rudder arrangement, wing-trailing edge flap arrangement, and the like, for aircraft or watercraft. The disclosure more particularly relates to the cover for the gap ... | 10/28/1980 |
| 4218986 | Boat rudder accessory A rudder position return device for a boat rudder of the kick-up type comprises a U-shaped clip with lateral lugs, an elastic band to be stretched across the aft side of the rudder and be fastened to the clip at its fore side and a pair of dish-shaped was... | 08/26/1980 |
| 4088088 | Pivotable rudder and means for securing in various positions A rudder assembly for small sailboats with a tiller which extends forwardly of a stock member and which is pivotally connected with a vertical rudder also pivotally connected to the stock member. The tiller pivot is spaced rearwardly and above the stock p... | 05/09/1978 |
| 4048936 | Apparatus and method for selectively supporting, conveying and mounting a propeller and rudder An apparatus and method wherein a pair of frame members each having four jacks and placed one upon another are provided with other jacks which are horizontally movable to change the relative position of the frame members, and the jacks are suitably operab... | 09/20/1977 |
| 4046093 | Kickup rudder apparatus having adjustable rake A rudder is pivotably mounted in an integral rudder-tiller support having a spring-loaded detent engageable by a lock on the rudder which may be adjusted to change rake and which may be released to free rudder to swing on its pivot by moving detent out of... | 09/06/1977 |
| 4029038 | Releasable rudder lock A rudder lock for pivotally mounting a rudder on a boat and comprising a bracket attachable to the rudder, a pintle attached to the bracket, and a mounting member attachable to the boat and having an aperture sized to receive the pintle. A resilient lock ... | 06/14/1977 |
| 4024827 | Vessel rudder assembly, particularly a balance type profile rudder with a fin A vessel rudder assembly including a rudder stock bearing, a rudder shaft and a rudder blade whereby the rudder stock bearing is in the form of a cantilever beam including an internal bore through which the rudder shaft extends the rudder blade is connect... | 05/24/1977 |
| 4016824 | Rudder post tube assembly A rudder post tube assembly for sailing craft having an inverted frusto-conical shell rotatably fitting in an inverted frusto-conical casing which opens out of the bottom of the craft. A rudder post tube is secured to the wall of the shell for rotatably s... | 04/12/1977 |
| 4008677 | Retractible rudder A transom mounted retractible rudder for sailboats or other small vessels. A rudder blade is pivotally mounted on a lower portion of a rudder stock. By means of a handle located adjacent the stern of the boat and connected through a linkage to the rudder ... | 02/22/1977 |
| 3976026 | Slow speed steering control for jet-powered water craft The jet power unit of a water craft is provided with a steering plate which is deflectable upwardly but which is continuously oriented in the direction of but spaced below the flow of water from the jet. The jet power unit preferably includes movable stee... | 08/24/1976 |
| 3952682 | Steering assembly for a marine craft A marine craft steering assembly comprises a rudder stock mountable on a craft for steering movements, and a rudder blade mounted on the stock to partake of steering movements therewith and to swing relatively to the stock to a raised position if the blad... | 04/27/1976 |
| 3946693 | Removable inboard rudder An inboard rudder capable of being removed and mounted through a hollow trunk within the hull of the boat and so arranged that the rudder post is pivotally mounted and held in place against one side of the trunk by means of a filler member which is insert... | 03/30/1976 |
| 3942462 | Marine craft steering assembly A marine craft steering assembly comprises a rudder stock mountable on a craft for steering movements; a rudder blade mounted on the stock to partake of steering movements therewith and to swing relatively to the stock to a raised position if the blade en... | 03/09/1976 |
