Abstract:
A water craft constituted by a fiberglass body with a streamlined bow in back of which is a recess forming a seating compartment. The rear end of the body is formed to provide a keel. Front-to-back guides in the seating compartment support a shiftable seat having dismountable arms that extend laterally to opposite sides of the body to support floats at their ends. In front of the seat, pedals are supplied which are kinematically joined to a central shaft within the body that is connected to a drive shaft that emerges from the body for driving a propeller.

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention concerns an occupant-propelled nautical vehicle. 
     SUMMARY OF THE INVENTION 
     This new nautical vehicle, whose structure is a notable improvement over the one covered by Spanish utility model Pat. No. 278.528 of the same applicants, and also because it perfects the reversing mechanism by the movement and drive described partly in Spanish utility model Pat. No. 276.962, by these same applicants, is basically formed of a floating central body, fitted preferably with a seat. The vehicle comprises a pair of dismountable lateral arms which hold floats, and also a rear rudder and a rear keel located below the float line. The vehicle can move smoothly over any liquid surface thanks to its large floating plane and also the very little effort which is needed for its drive. For this drive, the muscular effort produced by the legs of the user shall be a decisive factor, as they work with a rocking movement on a couple of front pedals which will transmit it to an interior, longitudinal shaft. This rocking action is converted to a unidirectional rotary force and movement by a mechanism which will be described later, and which will transmit it to the shaft of the corresponding drive propeller. 
     The idea of this boat is therefore new regarding its very structure, and also, mainly its drive system which, as already mentioned, consists of taking advantage of a rocking movement, and consequently a gentle, light movement, transforming it into a continuous one-way movement. 
     It is extremely easy to handle this boat and since it does not need oars, it leaves the user&#39;s hands free, for fishing, hunting, etc. all during sailing. 
     Thanks to its enormous floating power and since it has two side floats which stabilize it, and as it is also hermetically sealed, the action of the waves does not sink or capsize it, and allow very easy manoeuvres to be carried out using a rear rudder which can be worked indistinctly with both hands. 
     The entire body of the boat will be made in fibre-glass, and the drive mechanism will be nylon fibre and stainless steel and consequently will not be affected by the corrosive effects of water. 
     On the other hand, the fact that the side arms with their floats can be easily dismantled, makes it easy for the boat to be transported, for example, on a car-rack, and it also occupies a smaller space when not in use. 
     Furthermore, it presents the variant that through a simple transformation, it can be converted into a wide catamaran, for which and counting on two units of the central body arranged parallel to one another and with at least one end without arms and floats, they can be joined by means of an intermediary ribbing, leaving a useful space which can be used for loading underwater fishing equipment, etc. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     In order to correctly understand this object, two sheets of drawings are enclosed with this descriptive memorandum, which by way of example, all and each part making it up are represented. 
     The following is represented in these sheets of drawings: 
     FIG. 1 is a side view of the boat, with its internal mechanism. 
     FIG. 2 is a top plan view of FIG. 1. 
     FIG. 3 is a perspective view of the boat. 
     FIGS. 4(a) and 4(b) are front and side views of a detail of the drive reversing device. 
     FIG. 5 is a sectional view of the central body section and floats as taken on line x--x of FIG. 1. 
     FIG. 6 is a top plan view of a variant, transforming the boat into a catamaran. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In the drawings, with the same reference numerals, the following main parts are referenced: 
     The nautical vehicle is made up of a central tubular body 1 of aerodynamic shape, built in fibre-glass, which has a bow 2 which tends to reduce its diameter, with its lower plane 1 streamlined by two planes which tend to converge in a slender central vertex, which gives it a minimum friction profile in its movement over the water. At the rear the body has a bevel 3 beneath which is the corresponding propeller 14, with a keel 4 in this area and below the float line. The keel is sighted by a space 5 which limits it with the above mentioned bevel. 
     The upper surface of the body 1 has a longitudinal slot 6 and a flat casing, where there is a seating 22 towards the rear, which is fixed and with possibility of movement along guides 21. A couple of pedals 9 in front, that is to say, in the front part of the boat, are fixed to the ends of braces 8 and these in turn to a common central shaft 7 which emerges from the surface of the vehicle. The shaft is projected inside until it meets through a cardan joint 10 a longitudinal axle 11. At the other end the axle is connected to a reversing device 12 from which finally the drive shaft 13 emerges on which propeller 14 is fitted. 
     At the rear of the body 1 and on its upper plane, it has an upright aileron 17 which secures an orientable rod 19 by means of a clamp 18 and which runs right along the rear plane of the boat until it reaches the position of the bevel 3, at which point there is a rudder 20. At the bottom of this aileron there is a brace 39 at the sides of which some cable ends are secured 16 located on either side of the vehicle and which run down to drive levers 15 which are located coinciding with the rear part of the seating 22 so that when these levers are worked, the rudder is moved to the left or right indistinctly. 
     At the rear third of the vehicle there are dismountable side arms 23 which are tapered and bent backwards, containing floats 24 at the ends which have a section 1&#39; at the bottom which is identical to that of the central body to provide a better sliding movement. In the part where they join the body, these arms have pivots 25 which are inserted in bore 26 arranged for this purpose in the central body; the joint is assured by a couple of strips which are secured by a screw. 
     The reversing movement device 12 which is fitted at the rear of the vehicle and which also covers the inside of the keel 14, is assembled on two supporting planes 27 which fit inside the body 1. Two identical primary and secondary cogwheels 28 29 are fitted between these planes, which connect tangentially but only in one part of thickness; one of them is fitted on the end of the longitudinal shaft 11. These wheels, in turn, will each connect into another pair of smaller tertiary cogwheels 30 31 which have half the thickness of the previous ones and are fitted on a central shaft 32 and respectively have a ratchet which holds or releases them depending on the description of the operation which will be given below. 
     The central shaft 32 which the smaller wheels are assembled on, is extended at the outside of the supporting planes 27 so that at one end it has a large first cogged wheel 33. Underneath this latter wheel, and inside the part which corresponds to the keel 4, there is another second cogged wheel 34 which absorbs and makes it possible to lower the propeller plane below the float line, and introduce it in the water; and lastly, this additional wheel is geared to a final third cogged wheel 35 from which the output shaft comes out 13 which emerges outside and receives the propeller 14 which is fitted below the bevel 3 and is protected by the body of the keel 4. 
     The performance of this movement reverser 12 is determined by the action of the user of the vehicle on the pedals 9 so that when these are moved, shaft 7 is turned; this movement will be transmitted by the cardan 10 to the longitudinal shaft 11 and from here to the reversing mechanism, so that if the movement which is transmitted has a left-right direction, the wheel 28 will turn in this same direction and in turn will lock in the smaller wheel 31 which will turn in a contrary direction, that is to say right-left; its ratchet will remain loose and will not operate on its shaft 32. Whilst this is happening and since wheel 28 is locked with its twin 29, it makes this turn in a right-left direction, and the latter in turn, the opposite way to the smaller twin wheel 30 which works by its ratchet on the central shaft 32, so that this turns from left to right like the crown wheel 33 with which it is solidary. 
     The second possibility, in other words shaft 11 turns in a right-left direction, and wheel 28 which will turn in this direction will operate in countersense on wheel 31 so that the ratchet which is locked will work on the shaft, and likewise will cause this to turn as in the above case, in left-right direction like the crown wheel 33; in this movement, wheel 29 pulled by 28 will turn from left-right, and at the same time wheel 30 which will not work by its ratchet on the central shaft 32 will do so from right-left, leaving this shaft free, which will however be worked by the twin wheel 31. 
     Based on the above description for working the reversing mechanism 12, the rocking movement on the pedals 9 is made from right or left, indistinctly; the resultant on the outlet shaft 32 will always be in the same direction, i.e. left-right, which will make the big wheel 33 move in this direction, so that this, through the complementary wheel 34 will make the outlet wheel 35 turn, which will move its shaft 13 which contains the propeller 14 and will determine its drive and consequently make the boat move. 
     Lastly, and in the likely event that the boat structure is to be enlarged, arms 23 should be dismounted with their respective floats, leaving just the central body 1 to join a second body which is arranged parallel to the other, and incorporating linkage 37 38 which is fixed to the corresponding side borings and is protected by the corresponding waterproof joints, to form a catamaran nautical vehicle. 
     After sufficiently describing the nature of the model, it is expressly declared that any modification in details which is introduced in same shall be considered included within this protection, so long as it does not alter or essentially modify its characteristic purpose.