US 3556039 A
Description (OCR text may contain errors)
United States Patent Albert P. Si'redda 2106 Iris Place, Bethlehem, Pa. 18018 779,465
Nov. 27, 1968 Jan. 19, 1971 lnventor Appl. No. Filed Patented PROPULSION DEVICE 7 Claims, 4 Drawing Figs.
US. Cl 115/14  References Cited UNlTED STATES PATENTS 2,983,244 5/1961 Young 115 11 Primary Examiner-Trygve, M. Blix ABSTRACT: A manually powered and/or motorized fluid reaction propulsion device having fluid receiving chambers with fluid displacement mechanisms connected to the upper portions of the chambers for effecting a continuous intake and thrust-producing expulsion of sea water through openings in the rear ends of the chambers.
. l PROPULSION DEVlCE SUMMARY OF THE INVENTION This invention relates to propulsion devices for watercraft and is especially concerned with a propulsion device generally of the fluid reaction type.
An object of the present invention is to provide a propulsion device that is simple in construction, This device can be powered and steered by physically operating foot pedals that are connected to fluid displacement means. Auxiliary motorized drive mechanism is also provided. 7
.Another object is to provide vent mechanisms for controlling fluid flow through the propulsion system. thereby controlling steering and the general motion of the propelled watercraft.
Other more specificobjects and advantages will be apparent from the following description of an'illustrative embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS DISCLOSURE OF THE EMBODIMENT Referring to FIGS. 1. 2. and 3 of the drawings. the propulsion mechanism is shown mounted on a flat bottomed boat. however this system isusable on other types of watercraft. A pair of chambers 2 and 3 are secured to rear section of boat 1. Bellows 4 and 5 are secured to the upper forward ends of the chambers. The rear portions of the chambers extend through transom I7 and have openings 14 and 15 that are generally.
disposed below the water line [6. Bellows 4 and 5 are shown as fluid displacement means, however other suitable displacement means may be employed. Bellows 4 and 5 are disposed generally above water line 16, so that the upper portions of the chambers will contain trapped air. Air vents II and 12 are disposed near upper portions of bellows. Suitable valves may be employed for opening and closing the vents. Drive motor 10 has cranks 8 and 9 disposed at opposite ends of the motor shafts. The cranks are connected to the bellows 4 and 5. with pins 18 and 19. Cranks may be disengaged and foot pedals 6 and 7, mounted to bellows, may be employed for expanding and compressing bellows. Bellows can be expanded by the buoyant force of sea water. I
Refer particularly to FIG. 2. In operation. by depressing bellows 4. either physically by foot pedal 6. or by motorized crank 8, will force trapped air 20 in upper section of chamber outward from position to position 31. as indicated by dotted line. The air in turn forces contained sea water out of the chamber through opening '14, thereby producing thrust. The return stroke of crank 8 expands bellows 4. This action plus the buoyant force produced by the sea water displaces trapped air to its original position and refills chamber with sea water to position 30. Expansion spring 33 assists the expansion of the bellows. One end of the spring is secured to bellows foot pedal 6 and the other end to chamber 2. Vents I1 and 12 may be employed for steering. For example'if vent I1 is covered by hand or closed by a suitable valve and vent 12 is open, power actuation of bellows 4 will force air in and out of open vent and will not expel thrust-producing sea water from chamber 2. If vent 11 on chamber 3 is closed, power actuation of bellows 5 will displace air rearwardly and force the expulsion of thrustproducing sea water through opening IS. The fact that chamber 3 is disposed on right side of boat 1, the thrust from chamber 3 will encourage a left turn. Vents are not necessary if the boat is constructed solely for manual operation. Steering may be accomplished simply by pumping one bellows faster than the other. The propulsion mechanism is shown mounted generally inside a watercraft. however it may be mounted completely or partially exterior to a watercraft.
Conventional fluid deflector means may be employed to deflect expelled sea water forward to thereby propel the craft in reverse.
FIG. 4 shows a modification of the present invention. The fluid receiving chamber 34 is mounted generally below the water line 29 of boat 21 and is filled with sea water. The rear portion of the chamber extends through the rear bottom section of the boat and has an opening 23 communicating with the sea. Diaphragm 28 is secured to and communicates with chamber 34. Slide rod 25. supported by support 35. is secured to the diaphragm at one end. and the other end is secured to cam follower 26. which engages cam 27. Cam is so shaped that rotation of cam, by motor 32. forces the rod and diaphragm rearward to expel thrust-producing sea water at a velocity three times higher than the return velocity on the intake stroke. The forward movement of rod and diaphragm plus the buoyant force of sea water effects the refill of chamber 34 without nullifying the forward movement of the boat.
It will be obvious to those skilled in the art that many variations may be made in the embodiments chosen for the purpose of illustrating the present invention without departing from the scope thereof as defined in the appended claims.
1. In combination. a boat hull, a propulsion device mounted in said hull. said propulsion device comprising a pair of chambers disposed generally parallel to each other. and having happed fluid therein. each chamber having a portion extending through said hull and having an opening communicating with the sea, mechanical displacement means connected to each chamber, a foot pedal with a means for actuating each displacement means, each foot pedal being independently operable, whereby continuous physical operation of said foot pedals effects a continuous intake and expulsion of thrustproducing sea water through said openings, by moving said trapped fluid in and out of said displacement means.
2. The combination according to claim 1. each chamber is provided with an extended portion for containing trapped air whereby continuous internal displacement of said air by said displacement means. effects a continuous intake and expulsion of thrust-producing sea water through said opening.
3. The combination according to claim 2. each said extended portion is provided with an air vent and means for opening and closing said vents.
4. The combination according to claim I. wherein the buoyant force of seawater solely effects the filling of said chambers with sea water and the expansion of said displacement means.
5. The combination according to claim I, wherein spring means assist the expansion of said displacement means.
6. The combination according to claim I, wherein displacement means are generally composed of a flexible material whereby the displacement means are capable of expansion as a result of the buoyant force produced by sea water.
7. The combination according to claim I, mechanical means for driving saiddisplacement means, drive means inelude means for imparting irregular actuation of said displacement means. whereby the intake velocity of sea water in said chambers is slower than the expulsion velocity.