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| Number | Title | Issue Date |
| 5618213 | Twin impeller drive for jet pump A jet propulsion unit for a watercraft that employs a pair of counter rotating impellers that are disposed immediately adjacent each other so that the need for straightening vanes is eliminated. The impellers are driven by a bevel gear transmission to rot... | 04/08/1997 |
| 5601464 | Transmission system for counter-rotational propulsion device A transmission system for a counter-rotational propulsion device is easily incorporated into an existing outboard drive of a watercraft to convert the outboard drive from a single propeller drive to a counter-rotational dual propeller system. The transmis... | 02/11/1997 |
| 5586921 | Watercraft A small watercraft powered by twin jet propulsion units, each driven by a respective engine. The engine is concealed within a hatch cover that has a larger portion which is removable for removal of the engine and a smaller portion which is pivotal for ser... | 12/24/1996 |
| 5558498 | Propeller shaft assembly for marine propulsion system A simple structured propeller shaft assembly for a counter-rotating propeller system of a watercraft outboard drive prevents fishing line, weeds and like debris from entangling on a shaft of the propeller system and damaging the lubricant seals of the sha... | 09/24/1996 |
| 5556312 | Bearing arrangement for marine transmission An improved transmission bearing assembly for a counter-rotating propeller system of a marine outboard drive directly journals the driven gears of the transmission on the propulsion shafts of the outboard drive. The hub of one driven gear is journaled bet... | 09/17/1996 |
| 5556313 | Outboard drive transmission A transmission for a counter-rotating propeller system of a watercraft outboard drive includes a reduced friction coupling between the inner and outer shafts which permits transfer of the thrust loading on the inner shaft to the outer shaft under a revers... | 09/17/1996 |
| 5529520 | Propulsion system for marine vessel A propulsion unit for watercraft that employs a pair of counter-rotating propellers disposed one in front of the other in order to improve the performance upon acceleration, a cavitation effect is generated around at least one of the propellers at least d... | 06/25/1996 |
| 5527194 | Thrust sensor for marine drives In a marine drive (10), a nonrotational thrust sensing device (202 or 204) is placed between the stationary housing (26') and rotating propeller shaft (40' or 42') to measure the thrust output of a propeller (12 or 14) by measuring the equal and opposite ... | 06/18/1996 |
| 5520559 | Shifting mechanism for outboard drive A shifting mechanism for an outboard drive of a watercraft provides reduced coupling shock when the forward gears are engaged by a dual clutch assembly, as well as provides for consistent and quick engagement of the clutch assembly with the gear. The shif... | 05/28/1996 |
| 5514011 | Propeller arrangement for a marine propulsion unit A propeller has a hub affixed to a propeller shaft so as to rotate therewith. The hub is axially locked by a locking arrangement consisting of a lock nut screwed on to the shaft and a lock screw screwed into the end of the shaft to lock the nut. The screw... | 05/07/1996 |
| 5501623 | Propeller drive A propeller drive having coaxially aligned propellers separately operable or operable in unison in the same rotary direction. Independent operation of each propeller or operation of both in unison for maximum speed provides an efficient propeller drive fo... | 03/26/1996 |
| 5494466 | Transmission for dual propellers driven by an inboard marine engine Transmission for a single engine drive for dual concentric propellers in a straight or V-drive arrangement with the straight-drive including four shafts and nine gears and the V-drive adding two more shafts and four more gears.... | 02/27/1996 |
| 5492492 | Seal arrangement for propeller shafts of ships A seal arrangement for controlling any large bearing clearance in the vicinity of a propeller shaft, such as for a propeller drive system for ships with two concentric propeller shafts rotating in opposite directions. The seal arrangement has a housing ri... | 02/20/1996 |
| 5462463 | Marine dual propeller lower bore drive assembly A marine drive (10, 310) has two counter-rotating propellers (12 and 14, 312 and 314). Inner and outer concentric counter-rotating propeller shafts (40 and 42, 340 and 338) are supported by a spool (38, 336) in the lower horizontal bore (28, 328). Passage... | 10/31/1995 |
| 5449306 | Shifting mechanism for outboard drive A shifting mechanism for an outboard drive of a watercraft provides reduced coupling shock when the forward gears are engaged by a dual clutch assembly, as well as provides for consistent and quick engagement of the clutch assembly with the gear. The shif... | 09/12/1995 |
| 5425663 | Counter-rotating surfacing marine drive with planing plate A marine drive (10) has two counter-rotating surface operating propellers (12 and 14). A planing plate (230) extends rearwardly from the drive housing (20) above the propellers (12 and 14) and pushes down on the surface of the water during initial boat ac... | 06/20/1995 |
| 5415576 | Counter-rotating surfacing marine drive with defined X-dimension A marine drive (10) has two counter-rotating surface operating propellers (12 and 14). The drive has a vertical X-dimension (254) in the range of about 13 inches to 19 inches in combination with a shaft-spacing dimension (258) in the range of about 8 inch... | 05/16/1995 |
| 5413512 | Multi-propeller drive system A multi-propeller drive system having a single input shaft for connection an engine system, a differential gear assembly for dividing the driving force from the input drive shaft between a pair of output shafts and a pair of laterally spaced propellers d... | 05/09/1995 |
| 5403218 | Shifting mechanism for outboard drive A shifting mechanism for an outboard drive of a watercraft provides a simple and compact transmission, as well as streamlines a lower unit of the outboard drive to reduce fluidic drag. The shifting mechanism is located on a drive train generally aligned a... | 04/04/1995 |
| 5374208 | Ship, in particular deep draft vessel having concentric, contra-rotating propellers A ship, in particular a deep-draft vessel configured for travel on the oceans or great lakes, can have a hull with two concentrically rotating propeller shafts passing through the hull, and rotate in opposite directions to one another. The ship will gener... | 12/20/1994 |
| 5356320 | Seal arrangement for propeller shafts of ships A seal arrangement for controlling any large bearing clearance in the vicinity of a propeller shaft, such as for a propeller drive system for ships with two concentric propeller shafts rotating in opposite directions, has a housing ring for supporting the... | 10/18/1994 |
| 5352141 | Marine drive with dual propeller exhaust and lubrication A marine drive (10) has a spool (36) positioned in the lower horizonal bore (28) and supporting a dual propeller shaft assembly (38, 40). An exhaust passage (130) includes a passage (132) in the drive housing (26) communicating with the horizontal bore (2... | 10/04/1994 |
| 5344349 | Surfacing marine drive with contoured skeg A marine drive (10) has two counter-rotating surface operating propellers (12 and 14). The upper end (302) of the leading edge (288) of the skeg (194) is spaced forwardly of the lower end (310) of the trailing edge (306) of the skeg (194) by a horizontal ... | 09/06/1994 |
| 5342228 | Marine drive anode A marine drive is provided with a large volume anode, about 30 cubic inches, for galvanic protection. The anode (230) is a brick-like block member tapered along each of its height, width and length dimensions. The drive housing has an anode-mounting secti... | 08/30/1994 |
| 5310371 | Tandem propeller assembly for a marine propulsion unit A tandem propeller assembly for use with a marine propulsion unit is disclosed wherein a single shock-absorber assembly is utilized to assure damping effects for both propellers so as to protect the propulsion system from being damaged when either propell... | 05/10/1994 |
| 5289068 | Two-stage submersible propulsor unit for water vehicles A two-stage submersible propulsor unit comprises a shroud having a water inlet and a water outlet, a shaft assembly centrally mounted within the shroud, an upstream and a downstream propeller, each of which includes a separate hub rotatably mounted on the... | 02/22/1994 |
| 5232386 | Counter rotating strut drive A strut mounted, counter rotation marine propeller propulsion system of the single engine is provided including a depending propeller shaft strut from which aligned front and rear propeller shafts are supported including remote ends disposed exteriorly of... | 08/03/1993 |
| 5230644 | Counter-rotating surfacing marine drive A marine drive (10) has two counter-rotating surface operating propellers (12 and 14). An upper adaptor spool (48) has a lower threaded outer portion (50) mating with a threaded portion (46) of the vertical bore (26) of the drive housing (20) and supporti... | 07/27/1993 |
| 5185545 | Dual propeller shock resistant submersible propulsor unit A high-thrust, shock-resistant submersible propulsor unit comprises of a shroud having a water inlet and a water outlet, a shaft assembly centrally mounted within the shroud, and an upstream and a downstream propeller, each of which includes a separate hu... | 02/09/1993 |
| 5087230 | Drive transmissions In a ships drive transmission, contra rotating propeller shafts are driven by powered means comprising concentric contra rotating drive elements, one of the shafts being connected thereto via epicyclic gearing. The propeller shafts are also coupled to eac... | 02/11/1992 |
| 5052955 | Leisure boat A leisure boat is provided in a round form having a diameter of about 1 to 2 meters, and includes propeller means provided at a position closer to its bow from the center of the boat and the bow and having a mechanism for changing its driving direction an... | 10/01/1991 |
| 4932907 | Chain driven marine propulsion system with steerable gearcase and dual counterrotating propellers A marine propulsion system includes a steerable lower gearcase portion and a drive mechanism including a chain drive for driving dual counterrotating propellers. The dual propellers are rotatably mounted to the lower steerable gearcase portion by means of... | 06/12/1990 |
| 4897058 | Marine device with improved propeller shaft bearing carrier arrangement A marine drive (1) for a boat (3) includes a construction wherein a propeller supporting bearing device (29, 40) is disposed in a recess (28, 39) inside the propeller hub (23, 22). A bearing carrier (24, 37) is concentrically associated with a propeller s... | 01/30/1990 |
| 4846741 | Heel compensating steering arrangement for high speed boats A boat steering mechanism contemplates the disposition of parallel side-by-side drive shafts outboard of the boat's fore and aft centerline. The shafts are supported for high speed rotation by drive sleeves which are in turn supported by members attached ... | 07/11/1989 |
| 4832636 | Marine drive lower unit with sequentially loaded multiple thrust bearings A marine drive unit (1) includes a lower torpedo housing (9). At least one propeller shaft (21) is mounted in the housing for rotation about a drive axis (17). The propeller shaft is driven by a driving gear (16) suitably connected to a marine engine (4) ... | 05/23/1989 |
| 4815996 | Marine propulsion and control arrangement A marine propulsion unit providing for steerable legs for the propeller of a boat which are rotatable in steering direction through 360°. A transmission is provided having spiral bevel gears arranged so that for a constant direction of rotation bearing, ... | 03/28/1989 |
| 4654014 | Outboard motor trim system The invention involves an electromechanical mechanism for controlling the trim and tilt of an outboard motor mounted on outboard powered boats. Trim arms are pivotally mounted from brackets attached to a boat transom. The trim arms move the outboard motor... | 03/31/1987 |
| 4529387 | Propeller drive unit for boats A double propeller drive unit for boats having an inclined steering axis and a trim fin arrangement which is fixed to the cavitation plate of the drive unit, is disposed in the boundary region between the propellers, and is designed to balance torques act... | 07/16/1985 |
| 3938464 | Contra-rotating propeller drive system A contra-rotating propeller system, particularly adapted for high speed water craft, is characterized by a movable support for at least one of two nominally-aligned and independently driven contra-rotating propellers. In a particular embodiment a forward ... | 02/17/1976 |
