CA2145743A1 - Personal water surface towing device - Google Patents
Personal water surface towing deviceInfo
- Publication number
- CA2145743A1 CA2145743A1 CA 2145743 CA2145743A CA2145743A1 CA 2145743 A1 CA2145743 A1 CA 2145743A1 CA 2145743 CA2145743 CA 2145743 CA 2145743 A CA2145743 A CA 2145743A CA 2145743 A1 CA2145743 A1 CA 2145743A1
- Authority
- CA
- Canada
- Prior art keywords
- towing device
- water surface
- person
- persons
- device body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B35/00—Swimming framework with driving mechanisms operated by the swimmer or by a motor
- A63B35/08—Swimming framework with driving mechanisms operated by the swimmer or by a motor with propeller propulsion
- A63B35/12—Swimming framework with driving mechanisms operated by the swimmer or by a motor with propeller propulsion operated by a motor
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Toys (AREA)
Abstract
A self powered water surface towing device that tows a person by their hands through and across a water surface, comprising a buoyant hydrodynamically streamlined body (11), motive power means (3), handlebars and control levers (23,24) or other means of holding and controlling the towing device situated at or towards the forward end of the said towing device and where the rear end of the said towing device is adapted and shaped to merge and blend hydrodynamically with the upper chest area of a person being towed and is such a width that the upper arms and shoulders of the said person can be supported over and on top of the said rear end of the towing device and where a motor or power means and a propulsion means (3) are situated on the under side of the towing device, below the water surface, and where in use, the said motor or power means drives the said propulsion means which expels or drives a water jet or jets rearwards und underneath the body of the person being towed, and where most of the persons body from the chest down is essentially in the water below the surface unencumbered by contact with the towing device and where the said towing device is such and is so shaped and adapted that together with the person being towed, they form an essentially single combined hydrodynamically shape, that diverts or guides surrounding water underneath or around the persons chest area in a smooth flow.
Description
~~ ~ 94/05375 2 1 4 5 7 ~ 3 P(~r/~U93/00438 PERSONAL ~ATER SURFACE TOWING DEVI OE .
TECHNICAL FIELD
This invention relates to a self powered aquatic device that will tow a person through and across a water surfsce where in use most of the persons body is essentially in the water below the surface, but where the head and arms sre supported above the surface, in a manner that could be described as a powered alternative to swimming but with a higher speed capability.
BACKGRûUND ART
There are many varied vehicles or products designed for use on water, recreational or otherwise, ranging from various types of boats, powered sailing or rowing, to products towed by boats such as water skis, towable inflatable products and the like. Various other products powered or not, SUL~ h ~ jet skis, surfboards, pedaloes, canoes, windsurfing boards etc. All these products are designed to essentially carry and propel someone over and across a water surface. There are even products that still essentially carry and propel a person, although the person is in contact with the water or partially submerged, such as United States patents 3543712 or 3716013, or British specification 795194 or P.C.T.
publication WØ84101755.
As opposed to this concept of being carried and propelled over and across water, there are few products that actually tow a persons body itself directly in and through a water surface.
The few products designed to tow as exhibited by prior art take various forms, some of which are, a power unit attached to a framework and held above the water by a float or floats, towing a person behind (French No 2625684), a power unit enclosed in a boat shaped box or hull, with a means of holding on (Japanese No 2-12687û or British specification 1545222), or a device which is commercially available, a specially designed water sealed internal combustion engine operating direct in water, again with a means of holding on (United States patent No 3630165 '~o 94/05375 2 1 4 5 7 4 3 F~r/~U93/00438 or ~890920). Generally, the majority and the earlier of prior art had the means of holding and controlling positioned at the rear of the device. This was a very tiring and sluggish means of steering. Later on it was found that positioning the means of holding and controlling at the front of the towing device (United States patent 3890920) was less tiring and a lot more accurate, despite the fact that with this system it is necessary to control whether the device is tilted in an upwards or downwards direction as well as steering from side to side.
Although these and other designs are different from each other, the basic overall concept of all prior art has been a separate towing device, towing a person along as a separate entity. Although an acceptable arrangement at normal swimming speeds, little or no consideration seems to have been given to the potential or possible capabilities of a towing device beyond simply motorising a swimmer, and in fact above normal swimming speeds, the arrangement is inherently hy'drodynamically inefficient to the point of being self limiting, both in terms of performance or speed attainable, and also in the leve~ of energy required from the user for the following reasons.
It is a well known and accepted fact that if a human body lying face down is moved forwards through water with the arms outstretched and the head raised above the water surface, most drag or turbulence in the water will occur around the persons upper chest and shoulders, caused by the relatively blunt shape of the persons frontal chest area and shoulders trying to push through the water. This is the reason why even at speeds as low as normal swimming, all professional and any serious swi~mer will swim with their head down in an attempt to overcome this drag effect, only raising it momentarily in order to see and breathe.
Where a towing device is towing a person along as a separate entity, the necessity of the person being towed holding on to the device and consequently having their arms and chest submerged in the water while their head is raised snd tilted upwards in order to see and breathe creates if any speed is involved, considerable drag or turbulence in the form of a "bow wave" around the upper chest and shoulders for the reasons already explained. As speed is increased, the "bow wave" becomes more pronounced and higher, having the effect of trying to drag the -io 94/05375 2 1 4 5 7 4 3 PC~r/~U93/00438 person being towed away from the device, tiring the persons arms in the process and causing the person to attempt to hold their head higher which creates an even more pronounced and higher "bow wave", the only solution being to reduce speed.
.
All prior art where the only contact between the device and the person being towed is the persons hands holding on to the device, is inevitably tiring in use since any steering or directing, not just left or right but on some devices up or down as well, in order to maintain a desired driving angle or distance from the device, can only be accomplished by using the strength of their hands, wrists or arms.
A related effect which also causes tiring is that in normal sea conditions where waves exist, the level of the towing device bobbing up and down and that of the person being towed is constantly changing in relation to each other. In choppy water conditions, these changing levels can also mean that the persons body can inadvertently partially block or get in the way of the propelling stream of water.
Finally, with prior art, the person's head is not positively supported above the water surface. In conditions not anticipated, such as rough sea, cramp, illness, fatigue, sickness or injury, the person must still make the relevant effort to hold their head above water.
ln conclusion, although some are better than others, at any speed significantly above normal swimming speeds, all prior art requires considerably more energy and effort than necessary from the user, in order to steer or control, and to overcome the drag or turbulence around the person's chest area, in achieving what can only be a comparatively modest increase in speed before the self limiting effect inherent in the concept of a separate towing device and a separate user takes over.
DISCLOSURE AND ADVANTAGES OF lNVENTION
ln the following description of the present invention, it will be seen that the disadvantages mentioned of prior art have been overcome, and it is believed a unique benefit added, by adopting an essentially different concept, which is to regard the towing device and the person being towed as a single overall hydrodynamically streamlined entity.
vo 94/05375 21~ 5 7 ~ 3 Y~r/AU93/04438 This concept was arrived at by considering the basic example mentioned earlier of a human body lying prone in water with the arms outstretched in a substantially parallel manner and the head raised above the water surface and the best way to streamline it. The ultimate example of hydro dynamic streamlining considered was a dolphinlike shape. Accordingly, the principal object of the present invention is to go beyond simply motorising a swimmer at normal swimming speeds and emulate as far as possible the streamlining and effortless manner in which a dolphin moves and manoeuvres through water and to impart to the user of the towing device its sense of freedom, albeit only on the water surface.
For the sense of freedom, it is an important feature of the present invention that most of the persons body, at least from the chest down, is essentially in the water unencumbered by contact with the towing device but in a manner still consistent with efficient streamlining.
This is accomplished by supporting the outstretched srms on a hydro-dynamically streamlined buoyant body that fills in or spans the space between the arms, going some way in front beyond the hands to be able to incorporate a n~ wed streamlined nose, and continuing a streamlined shape rearwards on the under surface to skim the water, and shaping the rear end of the device to merge and blend hydrodynamically with the upper chest area of the user. Since the buoyancy of the towing device is higher than the person being towed, this area of merging and blending is held a close fit by the buoyancy of the device pushing upwards and the body weight of the person pushing downwards. The overall effect of combining the towing device and user in this manner produced the desired result of a single overall hydrodynamically streamlined shape that diverts or guides water underneath or around the users chest area in a smooth flow. It was also decided that any substantial weight including the motor or power means and propulsion means, should be underslung beneath the device body and water surface for maximum stability and so that the deck of the towing device could be substantially flat and clear of obstructions for good visibility. The towing device body was kept the same or similar width as the user partly for hydrodynamic reasons, but also so that the towing device would roll easily, with a self levelling effect caused by the underslung weight, so that manoeuvring or steering would simply be a matter of leaning or applying body weight with the upper arms and shoulders to the relevant side, with very little conscious ~ ~ 94/05375 2 1 4 5 7 4 3 Y~r ~
effort required.
All the various criteria has been met and the objects of hydrodynamic streamlining, effortless manoeuvring and a sense of freedom achieved, and it is believed, the present invention is a significant advance over prior art.
Consequently, according to the present invention there is provided, a self powered water surface towing device, that tows a person by their hands through and scross a water surface, comprising a buoyant hydrodynamically streamlined body , motive power means, handlebars and control levers or other means of holding and controlling the towing device situated at or towards the forward end of the towing device and where the rear end of the towing device is adapted and shaped to blend hydrodynamically with the upper chest area of a person being towed and is such a width that the upper arms and shoulders of the person can be supported over and on top of the rear end of the towing device. A motor or power means and a propulsion means are situated on the underside of the towing device below the water surface. In use, the motGr u~ power means drives the propulsion means, which expels or drives a water jet or jets rearwards and underneath the body of the person being towed. Most of the persons body from the chest down is essentially in the water, below the surface, unencumbered by contact with the towing device. The towing device is such and is so shaped and adapted that together with the person being towed, they form an essentially single combined hydrodynamically streamlined shape, that diverts or guides surrounding water underneath or around the persons chest area in a smooth flow and as speed is increased the towing device and the person being towed ride progressively higher over or through the water surface and assume the angle of least resistance in relation to overall water drag.
The advantages of the present invention over prior art can now be seen to be, number 1, the drag factor and self limiting eftect caused by the persons arms, shoulders and chest being in the water has been overcome.
Number 2, with the present inventions single entity concept, its closeness and overlapping with the person being towed is such that steering is executed with the shoulders or upper arms, not the hands, by ~ 94/0537S 21 ~ 5 7 4 3 PC~r/AU93/00438 leaning or applying body weight to the relevant side of the rear end of the towing device. The "handlebars" are in a fixed position and their function is simply a means of holding the towing device, and operating the control levers. It has been found in fact that in use the hands wrists and arms can be relaxed completely, consistent with the fingers remaining curled around the handlebars. Therefore the tiring effect with prior art of having to steer and direct continuously with hand, wrist or arm pressure has also been overcome.
Number 3, the related tiring effect in rough water conditions, or water conditions where waves exist, of the level of the towing device and the level of the person constantly changing in relation to each other is substantially reduced since the hands, arms, shoulders, chest and head of the person being towed and the said towing device, move up and down together, either up together or down together.
Number 4, where with prior art, the head is not positively supported above the water surface, with the present invention, when the person is holding the handlebars or me~ns of ;~oidi"g in the normal operating position, even if the person is incapacitated or semi-conscious for any reason, their head would still be positively supported above the water surface, both with the towing device moving or stationary.
Number 5, The unique benefit believed to be added, mentioned earlier, which could be the present inventions most important advantage, is a variable stretching or extending force applied to the torso and spine of the person being towed. This is caused by the propulsion force of the towing device pulling the hands, arms, and shoulders of the person in a forward direction, the lack of, or neutrality of water drag around their chest area, so that the force of the water drag pulling rearwards on their lower body, from the waist down, caused by the propelling water jet and surrounding water, is substantially greater than any water drag on their upper body. The force of the water drag on their lower body can be increased or decreased simply by varying the angle and position of their feet in relation to the propelling water jet, instead of just letting them trail in line. Coupled with the degree of relaxation and infinitely variable movement possible in water, either from steering from side to side or the movement up and down created by waves, the 't) 94/0!;37S 21 ~ 5 7 4 3 PCI /AU93/00438 .
overall effect has been found to be of significant benefit in reducing back pain in a person who suffers with this condition.
In conclusion, the present invention provides a water surface towing device that is not limited by poor hydrodynamic efficiency, and therefore has the capability to travel considerably faster thsn prior art in a smooth relaxed manner, with effortless steering snd significantly less overall physicsl effort required and since the head is always supported, with a high degree of safety. It is fun to use, and should prove to be a vsluable therspeutic aid.
DESCRIPTION OF THE DRAWINGS
FIG.1 is a side view of the water surface towing device and a person holding the device in the normal operating position with a typical water level while stationary, indicated by the horizontal dotted line, and also the path of the propelling water jet, with the persons feet in the normal trailing position and also angled downwards to incresse water drag on their lower body.
FIG.2 illustrates in perspective the water surface towing device.
FIG.3 shows a top view of the water surface towing device viewed from the rear, illustrating the chamfered and dished rear end shape.
FIG.4 is the same illustrstion as fig.3, but with a person in the normal operating position to illustrate the dimensional relationship and how steering is executed with the upper arms and shoulders.
FIG.5 is a side view of the self contained engine unit.
MODE FOR CARRYING OUT THE INVENTION
This particular example is intended as a light, quickly detachable, easily transportable interpretation of the basic concept, comprising three main component parts. A self contained engine unit, a main body sssembly and a hsndle bsr snd control lever sssembly.
Referring to Fig 5, the self contsined engine unit is a single cylinder internal combustion engine with a recoil starter 1 and a msgneto 2 of ~VO 94/0537S 21 4 ~ 7 ~ 3 ~Y~r/AU93/00438 orthodox design facing forwards and an enclosed propeller (not shown) mounted on the mainshaft facing rearwards, drawing in water at the front 3 and expelling a water jet rearwards through a tunnel 4. The engine unit includes and is attached to a one piece molded plastic tank 5 that incorporates an sir tsnk 6 with a snorkel 7 at the front, through which the carburetor breathes, and a separate fuel tank 8 at the back. Access to the spark plug 19 i8 through a hole molded in the center of the tank 5. The engine unit also includes a cradle 9, that attaches the front of the tank 5 to engine mounts located at the bottom of the crankcase magneto housing 10. This engine unit is of the type fully described in ~nited States patent 3890920 snd any further description is thought not to be necessary.
Referring to the drawings, the main body 11 is a hydrodynamically stresmlined component manufactured from a plastic foam which is light, durable, possesses a high degree of buoyancy, is rigid enough to maintain its shape, but is comfortable in use and energy absorbing in the event of a collision. It is one metre long, .4 metre wide at the rear, narrowing towards the front with a rounded streamlined nose. Ihe rear is chamfered snd dished in shape 12 to merge and blend with the upper chest area of the person being propelled. There is a large hole (not shown) aproximately in the middle, shaped to be a close fit over and around the fuel/air tank 5 of the engine unit. There is a top plate 13 manufactured from rigid plastic sheet fixed to the top of the main body 11 with four nylon screw type fixings 14. The top plate has two holes (not shown), one that locates around the air tank threaded top 15 and the other that locates around the fuel tank threaded top 16.
Screwing down the snorkel air tank cap 17, and the fuel tank cap 18, fixes the top plate 13 and therefore the main body 11, to the fuel/air tank 5 of the engine unit. There is a larger hole (not shown) in the top plate 13 between the other two, that gives access to the engine units spark plug 19. To complete the main body assembly, there is a top pad 20 made from the same material as the main body 11, which acts as a spacer between the main body and the handle bar assembly, covers the snorkel cap 17, the spark plug access hole, and the fuel cap 18. It also adds extra buoyancy and provides a comfortable chin or head support for the person being towed. There is a nylon securing strap 21, that wraps under the fuel tank 8, goes right through the main body 11 and top plate 13 ' O 94/05375 21 ~ 5 7 ~ 3 P~r/AU93/00438 and buckles over and retains the top pad 20.
The handlebar assembly consists of a set of handlebars 22, a control lever on each end 23 and 24, a support bracket on either side 25, a decorative central cover 28 and a control cable 26 and 27 from each control lever. The support brackets are fixed to the handlebars at a slightly greater width than the width of the main body top pad 20. The handlebar assembly is fitted to the towing device by pushing each support bracket 25 through a hole (not shown) in the forward end of the main body top plate 13, one on either side of the top pad 20, right through the main body 11, and sliding them into a spring loaded retaining clip 29 screwed and fixed on each side of the engine unit cradle 9. The right hand control lever 24 and its control cable 26, are connected to the accelerator lever on the carburetor. The left hand control lever 23 and its control cable 27, is a safety device that in the event of the person being towed, inadvertently letting go of the towing device, would either cause the towing device to go round in a continuous circling motion, or alternatively would stop the engine. The preferred method would be to have the lever and cable collneu~ed to a spring loaded rudder (not shown) so that when the lever is pulled right back to the handlebar, the rudder would be in a straight line with the towing device, and if the lever was accidentally released, the rudder would spring to one side out of line causing the towing device to move in a continuous circle until retrieved by the user.
It should be noted that the basic and essential concept of the present invention of regarding the towing device and the person being towed as a single entity for hydrodynamic purposes, is capable of interpretation in various ways, including different constructions and materials and ranging from sophisticated permanently assembled examples to relatively simple, light, quickly detachable, easily trasportable examples.
Therefore, while a relatively simple, quickly detachable example has been illustrated herein, it is appropriate that the appended claims be construed broadly and in a manner consistent with the spirit and scope of the invention herein.
TECHNICAL FIELD
This invention relates to a self powered aquatic device that will tow a person through and across a water surfsce where in use most of the persons body is essentially in the water below the surface, but where the head and arms sre supported above the surface, in a manner that could be described as a powered alternative to swimming but with a higher speed capability.
BACKGRûUND ART
There are many varied vehicles or products designed for use on water, recreational or otherwise, ranging from various types of boats, powered sailing or rowing, to products towed by boats such as water skis, towable inflatable products and the like. Various other products powered or not, SUL~ h ~ jet skis, surfboards, pedaloes, canoes, windsurfing boards etc. All these products are designed to essentially carry and propel someone over and across a water surface. There are even products that still essentially carry and propel a person, although the person is in contact with the water or partially submerged, such as United States patents 3543712 or 3716013, or British specification 795194 or P.C.T.
publication WØ84101755.
As opposed to this concept of being carried and propelled over and across water, there are few products that actually tow a persons body itself directly in and through a water surface.
The few products designed to tow as exhibited by prior art take various forms, some of which are, a power unit attached to a framework and held above the water by a float or floats, towing a person behind (French No 2625684), a power unit enclosed in a boat shaped box or hull, with a means of holding on (Japanese No 2-12687û or British specification 1545222), or a device which is commercially available, a specially designed water sealed internal combustion engine operating direct in water, again with a means of holding on (United States patent No 3630165 '~o 94/05375 2 1 4 5 7 4 3 F~r/~U93/00438 or ~890920). Generally, the majority and the earlier of prior art had the means of holding and controlling positioned at the rear of the device. This was a very tiring and sluggish means of steering. Later on it was found that positioning the means of holding and controlling at the front of the towing device (United States patent 3890920) was less tiring and a lot more accurate, despite the fact that with this system it is necessary to control whether the device is tilted in an upwards or downwards direction as well as steering from side to side.
Although these and other designs are different from each other, the basic overall concept of all prior art has been a separate towing device, towing a person along as a separate entity. Although an acceptable arrangement at normal swimming speeds, little or no consideration seems to have been given to the potential or possible capabilities of a towing device beyond simply motorising a swimmer, and in fact above normal swimming speeds, the arrangement is inherently hy'drodynamically inefficient to the point of being self limiting, both in terms of performance or speed attainable, and also in the leve~ of energy required from the user for the following reasons.
It is a well known and accepted fact that if a human body lying face down is moved forwards through water with the arms outstretched and the head raised above the water surface, most drag or turbulence in the water will occur around the persons upper chest and shoulders, caused by the relatively blunt shape of the persons frontal chest area and shoulders trying to push through the water. This is the reason why even at speeds as low as normal swimming, all professional and any serious swi~mer will swim with their head down in an attempt to overcome this drag effect, only raising it momentarily in order to see and breathe.
Where a towing device is towing a person along as a separate entity, the necessity of the person being towed holding on to the device and consequently having their arms and chest submerged in the water while their head is raised snd tilted upwards in order to see and breathe creates if any speed is involved, considerable drag or turbulence in the form of a "bow wave" around the upper chest and shoulders for the reasons already explained. As speed is increased, the "bow wave" becomes more pronounced and higher, having the effect of trying to drag the -io 94/05375 2 1 4 5 7 4 3 PC~r/~U93/00438 person being towed away from the device, tiring the persons arms in the process and causing the person to attempt to hold their head higher which creates an even more pronounced and higher "bow wave", the only solution being to reduce speed.
.
All prior art where the only contact between the device and the person being towed is the persons hands holding on to the device, is inevitably tiring in use since any steering or directing, not just left or right but on some devices up or down as well, in order to maintain a desired driving angle or distance from the device, can only be accomplished by using the strength of their hands, wrists or arms.
A related effect which also causes tiring is that in normal sea conditions where waves exist, the level of the towing device bobbing up and down and that of the person being towed is constantly changing in relation to each other. In choppy water conditions, these changing levels can also mean that the persons body can inadvertently partially block or get in the way of the propelling stream of water.
Finally, with prior art, the person's head is not positively supported above the water surface. In conditions not anticipated, such as rough sea, cramp, illness, fatigue, sickness or injury, the person must still make the relevant effort to hold their head above water.
ln conclusion, although some are better than others, at any speed significantly above normal swimming speeds, all prior art requires considerably more energy and effort than necessary from the user, in order to steer or control, and to overcome the drag or turbulence around the person's chest area, in achieving what can only be a comparatively modest increase in speed before the self limiting effect inherent in the concept of a separate towing device and a separate user takes over.
DISCLOSURE AND ADVANTAGES OF lNVENTION
ln the following description of the present invention, it will be seen that the disadvantages mentioned of prior art have been overcome, and it is believed a unique benefit added, by adopting an essentially different concept, which is to regard the towing device and the person being towed as a single overall hydrodynamically streamlined entity.
vo 94/05375 21~ 5 7 ~ 3 Y~r/AU93/04438 This concept was arrived at by considering the basic example mentioned earlier of a human body lying prone in water with the arms outstretched in a substantially parallel manner and the head raised above the water surface and the best way to streamline it. The ultimate example of hydro dynamic streamlining considered was a dolphinlike shape. Accordingly, the principal object of the present invention is to go beyond simply motorising a swimmer at normal swimming speeds and emulate as far as possible the streamlining and effortless manner in which a dolphin moves and manoeuvres through water and to impart to the user of the towing device its sense of freedom, albeit only on the water surface.
For the sense of freedom, it is an important feature of the present invention that most of the persons body, at least from the chest down, is essentially in the water unencumbered by contact with the towing device but in a manner still consistent with efficient streamlining.
This is accomplished by supporting the outstretched srms on a hydro-dynamically streamlined buoyant body that fills in or spans the space between the arms, going some way in front beyond the hands to be able to incorporate a n~ wed streamlined nose, and continuing a streamlined shape rearwards on the under surface to skim the water, and shaping the rear end of the device to merge and blend hydrodynamically with the upper chest area of the user. Since the buoyancy of the towing device is higher than the person being towed, this area of merging and blending is held a close fit by the buoyancy of the device pushing upwards and the body weight of the person pushing downwards. The overall effect of combining the towing device and user in this manner produced the desired result of a single overall hydrodynamically streamlined shape that diverts or guides water underneath or around the users chest area in a smooth flow. It was also decided that any substantial weight including the motor or power means and propulsion means, should be underslung beneath the device body and water surface for maximum stability and so that the deck of the towing device could be substantially flat and clear of obstructions for good visibility. The towing device body was kept the same or similar width as the user partly for hydrodynamic reasons, but also so that the towing device would roll easily, with a self levelling effect caused by the underslung weight, so that manoeuvring or steering would simply be a matter of leaning or applying body weight with the upper arms and shoulders to the relevant side, with very little conscious ~ ~ 94/05375 2 1 4 5 7 4 3 Y~r ~
effort required.
All the various criteria has been met and the objects of hydrodynamic streamlining, effortless manoeuvring and a sense of freedom achieved, and it is believed, the present invention is a significant advance over prior art.
Consequently, according to the present invention there is provided, a self powered water surface towing device, that tows a person by their hands through and scross a water surface, comprising a buoyant hydrodynamically streamlined body , motive power means, handlebars and control levers or other means of holding and controlling the towing device situated at or towards the forward end of the towing device and where the rear end of the towing device is adapted and shaped to blend hydrodynamically with the upper chest area of a person being towed and is such a width that the upper arms and shoulders of the person can be supported over and on top of the rear end of the towing device. A motor or power means and a propulsion means are situated on the underside of the towing device below the water surface. In use, the motGr u~ power means drives the propulsion means, which expels or drives a water jet or jets rearwards and underneath the body of the person being towed. Most of the persons body from the chest down is essentially in the water, below the surface, unencumbered by contact with the towing device. The towing device is such and is so shaped and adapted that together with the person being towed, they form an essentially single combined hydrodynamically streamlined shape, that diverts or guides surrounding water underneath or around the persons chest area in a smooth flow and as speed is increased the towing device and the person being towed ride progressively higher over or through the water surface and assume the angle of least resistance in relation to overall water drag.
The advantages of the present invention over prior art can now be seen to be, number 1, the drag factor and self limiting eftect caused by the persons arms, shoulders and chest being in the water has been overcome.
Number 2, with the present inventions single entity concept, its closeness and overlapping with the person being towed is such that steering is executed with the shoulders or upper arms, not the hands, by ~ 94/0537S 21 ~ 5 7 4 3 PC~r/AU93/00438 leaning or applying body weight to the relevant side of the rear end of the towing device. The "handlebars" are in a fixed position and their function is simply a means of holding the towing device, and operating the control levers. It has been found in fact that in use the hands wrists and arms can be relaxed completely, consistent with the fingers remaining curled around the handlebars. Therefore the tiring effect with prior art of having to steer and direct continuously with hand, wrist or arm pressure has also been overcome.
Number 3, the related tiring effect in rough water conditions, or water conditions where waves exist, of the level of the towing device and the level of the person constantly changing in relation to each other is substantially reduced since the hands, arms, shoulders, chest and head of the person being towed and the said towing device, move up and down together, either up together or down together.
Number 4, where with prior art, the head is not positively supported above the water surface, with the present invention, when the person is holding the handlebars or me~ns of ;~oidi"g in the normal operating position, even if the person is incapacitated or semi-conscious for any reason, their head would still be positively supported above the water surface, both with the towing device moving or stationary.
Number 5, The unique benefit believed to be added, mentioned earlier, which could be the present inventions most important advantage, is a variable stretching or extending force applied to the torso and spine of the person being towed. This is caused by the propulsion force of the towing device pulling the hands, arms, and shoulders of the person in a forward direction, the lack of, or neutrality of water drag around their chest area, so that the force of the water drag pulling rearwards on their lower body, from the waist down, caused by the propelling water jet and surrounding water, is substantially greater than any water drag on their upper body. The force of the water drag on their lower body can be increased or decreased simply by varying the angle and position of their feet in relation to the propelling water jet, instead of just letting them trail in line. Coupled with the degree of relaxation and infinitely variable movement possible in water, either from steering from side to side or the movement up and down created by waves, the 't) 94/0!;37S 21 ~ 5 7 4 3 PCI /AU93/00438 .
overall effect has been found to be of significant benefit in reducing back pain in a person who suffers with this condition.
In conclusion, the present invention provides a water surface towing device that is not limited by poor hydrodynamic efficiency, and therefore has the capability to travel considerably faster thsn prior art in a smooth relaxed manner, with effortless steering snd significantly less overall physicsl effort required and since the head is always supported, with a high degree of safety. It is fun to use, and should prove to be a vsluable therspeutic aid.
DESCRIPTION OF THE DRAWINGS
FIG.1 is a side view of the water surface towing device and a person holding the device in the normal operating position with a typical water level while stationary, indicated by the horizontal dotted line, and also the path of the propelling water jet, with the persons feet in the normal trailing position and also angled downwards to incresse water drag on their lower body.
FIG.2 illustrates in perspective the water surface towing device.
FIG.3 shows a top view of the water surface towing device viewed from the rear, illustrating the chamfered and dished rear end shape.
FIG.4 is the same illustrstion as fig.3, but with a person in the normal operating position to illustrate the dimensional relationship and how steering is executed with the upper arms and shoulders.
FIG.5 is a side view of the self contained engine unit.
MODE FOR CARRYING OUT THE INVENTION
This particular example is intended as a light, quickly detachable, easily transportable interpretation of the basic concept, comprising three main component parts. A self contained engine unit, a main body sssembly and a hsndle bsr snd control lever sssembly.
Referring to Fig 5, the self contsined engine unit is a single cylinder internal combustion engine with a recoil starter 1 and a msgneto 2 of ~VO 94/0537S 21 4 ~ 7 ~ 3 ~Y~r/AU93/00438 orthodox design facing forwards and an enclosed propeller (not shown) mounted on the mainshaft facing rearwards, drawing in water at the front 3 and expelling a water jet rearwards through a tunnel 4. The engine unit includes and is attached to a one piece molded plastic tank 5 that incorporates an sir tsnk 6 with a snorkel 7 at the front, through which the carburetor breathes, and a separate fuel tank 8 at the back. Access to the spark plug 19 i8 through a hole molded in the center of the tank 5. The engine unit also includes a cradle 9, that attaches the front of the tank 5 to engine mounts located at the bottom of the crankcase magneto housing 10. This engine unit is of the type fully described in ~nited States patent 3890920 snd any further description is thought not to be necessary.
Referring to the drawings, the main body 11 is a hydrodynamically stresmlined component manufactured from a plastic foam which is light, durable, possesses a high degree of buoyancy, is rigid enough to maintain its shape, but is comfortable in use and energy absorbing in the event of a collision. It is one metre long, .4 metre wide at the rear, narrowing towards the front with a rounded streamlined nose. Ihe rear is chamfered snd dished in shape 12 to merge and blend with the upper chest area of the person being propelled. There is a large hole (not shown) aproximately in the middle, shaped to be a close fit over and around the fuel/air tank 5 of the engine unit. There is a top plate 13 manufactured from rigid plastic sheet fixed to the top of the main body 11 with four nylon screw type fixings 14. The top plate has two holes (not shown), one that locates around the air tank threaded top 15 and the other that locates around the fuel tank threaded top 16.
Screwing down the snorkel air tank cap 17, and the fuel tank cap 18, fixes the top plate 13 and therefore the main body 11, to the fuel/air tank 5 of the engine unit. There is a larger hole (not shown) in the top plate 13 between the other two, that gives access to the engine units spark plug 19. To complete the main body assembly, there is a top pad 20 made from the same material as the main body 11, which acts as a spacer between the main body and the handle bar assembly, covers the snorkel cap 17, the spark plug access hole, and the fuel cap 18. It also adds extra buoyancy and provides a comfortable chin or head support for the person being towed. There is a nylon securing strap 21, that wraps under the fuel tank 8, goes right through the main body 11 and top plate 13 ' O 94/05375 21 ~ 5 7 ~ 3 P~r/AU93/00438 and buckles over and retains the top pad 20.
The handlebar assembly consists of a set of handlebars 22, a control lever on each end 23 and 24, a support bracket on either side 25, a decorative central cover 28 and a control cable 26 and 27 from each control lever. The support brackets are fixed to the handlebars at a slightly greater width than the width of the main body top pad 20. The handlebar assembly is fitted to the towing device by pushing each support bracket 25 through a hole (not shown) in the forward end of the main body top plate 13, one on either side of the top pad 20, right through the main body 11, and sliding them into a spring loaded retaining clip 29 screwed and fixed on each side of the engine unit cradle 9. The right hand control lever 24 and its control cable 26, are connected to the accelerator lever on the carburetor. The left hand control lever 23 and its control cable 27, is a safety device that in the event of the person being towed, inadvertently letting go of the towing device, would either cause the towing device to go round in a continuous circling motion, or alternatively would stop the engine. The preferred method would be to have the lever and cable collneu~ed to a spring loaded rudder (not shown) so that when the lever is pulled right back to the handlebar, the rudder would be in a straight line with the towing device, and if the lever was accidentally released, the rudder would spring to one side out of line causing the towing device to move in a continuous circle until retrieved by the user.
It should be noted that the basic and essential concept of the present invention of regarding the towing device and the person being towed as a single entity for hydrodynamic purposes, is capable of interpretation in various ways, including different constructions and materials and ranging from sophisticated permanently assembled examples to relatively simple, light, quickly detachable, easily trasportable examples.
Therefore, while a relatively simple, quickly detachable example has been illustrated herein, it is appropriate that the appended claims be construed broadly and in a manner consistent with the spirit and scope of the invention herein.
Claims (15)
1. A self powered water surface towing device being a means to tow a person lying prone by the hands, through and across a water surface comprising a buoyant hydrodynamically streamlined body, with a top surface deck adapted to be a means in use to support said persons fully extended arms, shoulders and upper chest thereon, a means at the rear end of said top surface deck to locate or engage with and blend and merge hydrodynamically with said persons chest area, a means for holding and controlling with the hands said towing device, positioned at or towards the front end of said towing device body, over its said top surface deck above the surrounding water surface so that said position of said means of holding, relative to said towing device body is a means to determine that said persons arms are fully extended and together with said persons shoulders and upper chest area are positioned over and are supported on top of said top surface deck of said towing device body, and where most of said persons body from the chest down is essentially in said water below its surface, unencumbered by contact with said towing device, a motive power means and propulsion means fixedly suspended underneath and exterior of, or substantially exterior of said towing device body, immersed in the surrounding water, said motive power means driving said propulsion means which expels a water jet or jets rearwards underneath said person being towed.
2. A self powered water surface towing device as claimed in claim 1, wherein said means of holding with the hands said towing device, and its said position relative to said towing device body, determining that said persons fully extended arms, shoulders and upper chest area are positioned over and supported on top of said top surface deck of said towing device body, is a means whereby steering is executed by said person applying body weight to the relevant side of said top surface deck with the relevant arm and shoulder.
3. A self powered water surface towing device as claimed in claim 2, wherein said means of holding with the hands said towing device and its said position relative to said towing device body, together with said hydrodynamically streamlined body and said means at the rear end of said top surface deck, to locate or engage with and blend and merge hydrodynamically with said persons chest area, is a means whereby said towing device and said person form an essentially single combined hydrodynamically streamlined entity that diverts or guides surrounding water underneath or around said persons chest area in a smooth flow.
4. A self powered water surface towing device as claimed in claim 3, wherein the combination of said means of holding with the hands said towing device, its said position relative to said towing device body, said hydrodynamically streamlined body, said means at the rear end of said top surface deck and the propulsion force of said towing device, pulling said persons hands and arms in a forward direction in opposition to the water drag on said persons lower body is a means whereby an extension force is applied to the skeletal joints of said person, consisting of their wrist, elbow, shoulder and spinal joints.
5. A self powered water surface towing device as claimed in claim 1, whereby said persons arms and shoulders are positioned over and are supported on top of most of the length of said top surface deck of said towing device body.
6. A self powered water surface towing device as claimed in claim 1, wherein said means at the rear end of said top surface deck, to locate or engage with and blend and merge hydrodynamically with said persons chest area, is an arcuately dished chamfered deck surface rear end, sloping downwardly and rearwardly relative to the general deck surface of said towing device body to substantially meet or meet the underside surface of said towing device body.
7. A self powered water surface towing device as claimed in claim 1, wherein said motive power means, said propulsion means and a water jet tunnel in combination, is a means of resisting sideways movement in said surrounding water, acting in the manner of a keel fin relative to said towing device body.
8. A self powered water surface towing device as claimed in claim 1, wherein the weight and position of said motive power means and propulsion means underneath and exterior of said towing device body is a means to exert a self centering and self levelling force to said towing device body by pulling downwards in opposition to its buoyancy.
9. A self powered water surface towing device as claimed in claim 1, wherein said motive power means is an internal combustion engine.
10. A self powered water surface towing device as claimed in claim 1, wherein said motive power means is an electric motor.
11. A self powered water surface towing device as claimed in claim 1, wherein said towing device body has the relevant buoyancy to support a persons hands, arms, shoulders, upper chest area and head substantially above a surrounding water surface but will not support or carry a whole person substantially above a surrounding water surface.
12. A self powered water surface towing device as claimed in claim 1, whereby if said means for holding with the hands said towing device is released by said person, said towing device and said person will readily seperate.
13. A self powered water surface towing device as claimed in claim 1, wherein said means for holding with the hands said towing device, is in a fixed position relative to said towing device.
14. A self powered water surface towing device as claimed in claim 1, wherein said towing device body is fixed or held to a seperate self contained motive power means/propulsion means/tank unit by said towing device body having a large hole aproximately in the middle, shaped to fit over and around said tank of said motive power means/propulsion means unit, which has two threaded filler orifice necks spaced apart and where said towing device body has fixed to it, or incorporated within it a rigid top plate with two holes in it which are positioned to fit over and around said two orifice necks, so locating said towing device body which is then fixed or held in position by screwing down a screw cap on each of said orifice necks.
15. A self powered water surface towing device substantially as described herein with reference to the accompanying drawings.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB929218511A GB9218511D0 (en) | 1992-09-01 | 1992-09-01 | Personal water surface propulsion vehicle |
| GB9218511.5 | 1992-09-01 | ||
| GB9309131.2 | 1993-05-04 | ||
| GB939309131A GB9309131D0 (en) | 1992-09-01 | 1993-05-04 | Personal water surface propulsion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2145743A1 true CA2145743A1 (en) | 1994-03-17 |
Family
ID=26301522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2145743 Abandoned CA2145743A1 (en) | 1992-09-01 | 1993-08-30 | Personal water surface towing device |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU676174B2 (en) |
| CA (1) | CA2145743A1 (en) |
| GB (1) | GB2270282B (en) |
| WO (1) | WO1994005375A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2720653B1 (en) * | 1994-06-07 | 1996-07-26 | Laurent Casters | Motorized boat for the movement of a person lying down. |
| WO2011019298A1 (en) * | 2009-08-10 | 2011-02-17 | Prashchurovich Boris Anatolievich | Floating transport means |
| FR2969116B1 (en) | 2010-12-20 | 2013-06-21 | Marc Vaudore | BODYBOARD WITH THERMAL MOTOR FOR EVOLUTION IN WAVE |
| CN106143822A (en) * | 2016-07-07 | 2016-11-23 | 深圳市瑞脉科技有限公司 | Robot is advanced under intelligent water |
| RU2658617C2 (en) * | 2016-11-23 | 2018-06-21 | Николай Иванович Андреев | Electrosurfer |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1011381A (en) * | 1949-01-27 | 1952-06-23 | Propulsion float for towing a bather | |
| US3270707A (en) * | 1963-11-06 | 1966-09-06 | Aqua Dart Inc | Aquatic device |
| US3324819A (en) * | 1966-02-01 | 1967-06-13 | Wilco Ind Inc | Power actuated swim apparatus |
| US3442240A (en) * | 1967-12-13 | 1969-05-06 | Franklin J Wild | Power swimming aid |
| US3543712A (en) * | 1968-10-07 | 1970-12-01 | Av American Ventures Inc | Buoyant swimming aid |
| US3548771A (en) * | 1969-01-21 | 1970-12-22 | Caryl C B Hastings | Diving sled |
| GB1385200A (en) * | 1971-08-26 | 1975-02-26 | Francis A | Tow-craft for swimmer |
| US3890920A (en) * | 1973-06-06 | 1975-06-24 | Rockwell International Corp | Controls for aquatic towing craft |
| DE2555060A1 (en) * | 1975-12-06 | 1977-06-08 | Georg Herman | Drive system for water sport - consists of float element with motor driving turbine or propeller and fitted with tow bar |
| GB1545222A (en) * | 1977-12-05 | 1979-05-02 | Mcleod G | Motorized float |
| FR2637558A1 (en) * | 1988-10-06 | 1990-04-13 | Martin Jean Yves | Motorised nautical craft which tows the user or users planing over the water |
| JPH0626625B2 (en) * | 1988-11-08 | 1994-04-13 | 建治 三村 | Human body propulsion device |
| GB9014021D0 (en) * | 1990-06-23 | 1990-08-15 | Hancock Frank J T | Propulsion devices |
| US5158034A (en) * | 1992-02-24 | 1992-10-27 | Tontech International Co., Ltd. | Automatic swimming board |
-
1993
- 1993-08-24 AU AU44837/93A patent/AU676174B2/en not_active Ceased
- 1993-08-30 WO PCT/AU1993/000438 patent/WO1994005375A1/en active Application Filing
- 1993-08-30 CA CA 2145743 patent/CA2145743A1/en not_active Abandoned
- 1993-08-31 GB GB9318032A patent/GB2270282B/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| GB9318032D0 (en) | 1993-10-20 |
| AU4483793A (en) | 1994-03-10 |
| WO1994005375A1 (en) | 1994-03-17 |
| GB2270282B (en) | 1997-01-08 |
| GB2270282A (en) | 1994-03-09 |
| AU676174B2 (en) | 1997-03-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |