If the position of crank F is altered, as indicated by the arrow at its lower extremity, the motion is transmitted via the rods and intermediate smaller cranks to the others (which are coupled to the foils) and they follow suit such that the leading edges of the foils or vanes also follow suit.
- Parálisis temporal de la mitad del cuerpo
- Usar ropa limpia, cómoda y de algodón
- Overall length preferably about 100 m to 200 m
- Es baja en proteínas, pero rica en agua
- A veces, el cuerpo se torna débil y puede haber un desmayo
In preferred embodiments, the foil mechanism can be such that the levers operat ing the leading and trailing edges of the foils are slightly out of phase so that, in some posi tions, the foils are at right angles to the direction of flow when they pass through the mid dle of their cycle.
Dolor Neuropático Central
Operation of either of the levers 340, 347 causes the linkages to move so as to adjust the angle at which the foils are oriented relative to the boat. The ideal graph for a flapping foils system is shown. It basically dissects a circular motion into two sine waves which are orientated In the ideal direction. In Figure 18, two L-shaped rods A, B are pivoted at fixed reference points C, D. When their ends E, F are moved in the direction of the vertical arrows, their other ends G. H move laterally as shown by the horizontal arrows. As shown in Figure 2b, the vane 20 is rigidly connected at right angles to a first arm 21 and is pivotally connected at 22 to one end of a second arm 23. The remote end of arm 21 is pivotally connected to rod 24 that extends parallel to arm 23. The rod 24 and arm 23 are connected to each other at the other ends and at an intermediate point by further arms 25 and 26. The arm 23 rotates about the same axis as a wheel 27. The arm 26 is connected for rotation with the wheel 27, which is mounted for rotation about an axis intended to have a fixed location in a ves sel.
The invention will be described with reference to the following drawings, in which: Figures 1 a-f illustrate a first mechanism for causing a vane to oscillate like a fishtail; Figures 2a-in illustrate a second mechanism; Figure 3 shows the Improvements possible with the present invention; Figure 4 illustrates how lift and drag vary with vane angle; Figures 5a-n Illustrate another mechanism using matched pairs of vanes; Figure 6a-i illustrate another paired mechanism; Figure 7 shows the invention applied to two pairs of vanes; Figure 8 shows the invention applied to four pairs of vanes; Figure 9 shows an adjustable belt drive – 4 Figure 10 shows an alternative adjustable belt drive; Figure 11 shows a device for converting rotary to linear motion; figure 12 shows an application of the Figure 11 device; Figure 13 shows another device for converting rotary to linear motion; Figure 14a-b shows two linear motion devices; Figure 15 shows another application of the Figure 11 device; Figure 16 shows an alternative form of linear motion device; Figure 17 shows a further application of the Figure 11 device; Figures 18,19 and 20 show alternative double acting devices; Figures 21,22 and 23 show alternative rotary drive devices using belts; Figure 24 shows an alternative version of the Figure 23 device; Figure 25 shows a linear motion device; Figures 26,27 and 28 show alternative forms of coupling to a foil; Figures 29 and 30 show different forms of double acting devices; Figures 31 and 32 show two different versions of power generating plant using the principles of the present invention; Figure 33 shows a propulsion mechanism for a pedal boat; Figure 34 shows a variation of the Figure 33 arrangement; Figure 35 shows the disposition of the propulsion device in a pedal boat; Figure 36 shows an adjustable phase device using a chain drive; Figure 37 shows a pedal mechanism; Figure 38 shows an enlarged view of the main bearing axis of the pedal boat; and Figure 39,40 and 41 show alternative versions of drive mechanisms.
Further variations The following description relates to an explanation of three different means of controlling the angle of the foil on the end of an oscillating lever, and their relative merits in propulsion systems and energy generators. Dolor de espalda primer trimestre de embarazo . This could be of great importance for water turbines where the foil trajectory passes through regions of different flow speed.
Others attempt to harness the flow of water in rivers and coastal areas where the flow varies in magnitude and direction ac cording to the bees. It will be appreciated that the conversion of movement into useful energy may in volve the generation of electricity by driving a suitable generator, or the direct use of out put motion, for example in driving a pump for pumping water or some other fluid. The sec- tor surfaces may therefore be toothed, ribbed or otherwise fashioned to enhance driving contact between them. Another inherent problem with propeller turbines is that they do not sweep the full cross-section available to them. Prior attempts at providing efficient, workable systems that do not suffer from in superable maintenance difficulties tend to separate into propeller turbine and cross-flow turbine types. There is therefore a need for an improved design that does not suffer from the above drawbacks and disadvantages.
Dolor Sordo Costado Derecho
The mechanism is similar to that described in Figure 1, so it will not be described in detail here but basically, the Figure 1 mechanism on one side of the wheel is repeated on the opposite side, the mechanism having an additional set of arms to transfer the drive to the second hydrofoil rather than having a separate set of arms or rods coupled directly to the same one wheel. The same principles can be applied to drive two pairs of hydrofoils as shown in Figure 7. The mechanism consists essentially of a mechanism according to Figure 6 onto which has been grafted another set of links as illustrated to cause a second pair of op- posed hydrofoils to oscillate with a phase delay relative to the first pair. Figure 20 shows a mechanism in which the principle of Figure 12 is applied via bar D to oscillate L-shaped bar A through pivotal connection E. Similarly, the same drive mechanism causes L-shaped bar B to oscillate in antiphase to bar A. Figures 21, 22 show the use of bars A, B provided with sector-shaped members C, D that inter-engage to transfer the oscillatory motion of one bar to the other.
Figure 29 shows a mechanism using a system of cranks enabling the vanes or hy drofoils to be oriented at will. Figure 32 shows a system with vertical vanes. The system shown In Figure 39 is the same in principal to the system described above. Here, a pin or the like B rotates as shown by the curved arrow. When the wheel 30 (say) Is rotated, the rod 29 is reciprocated up and down and, to a lesser extent, oscillates from side to side as shown in the sequence from Figure 2a through Figure 2h. The rack 28 causes the wheel 27 to rotate as the rack reciprocates. When the disc 2 is rotated in the direction of arrow 12, the rods 3, 4 cause the rods 5, 6 to oscillate left and right (in the drawing) when they rotate about their respec tive pivot points 7 and 8. The result of this is that the vane 1 is caused to yaw relative to the current which, in the present example, is taken to be flowing from top to bottom of the page.
When the position of pulley B is altered, the pulleys A follow suit and the position of the trailing edges of the vanes is con trolled accordingly. The shape of the track can be altered to determine exactly what angle the foil pre- sents to the flow at every position in its cycle. If the left to right movement is the useful movement, the invention takes the up and down movement and turns it into another left and right movement in the sister foil. Gripe con dolor de espalda . This alters the range of angles which the foil covers through its cycle. A larger radius will mean a larger range of angles. It will be noticed that from figure 2e onwards that the wheel 32 has not moved whereas the apparent length of the rod 29 has shortened. Since the wheel 30 is 90 de grees out of phase with wheel 32, it will create a cycle which is 90 degrees out of phase with the displacement of the foils, that is to say, a cosine relationship.
Figure 35 shows the Figure 33 mechanism slung across outboard bodies to create a catamaran-style pedal boat with immense manoeuvrability. The invention can also be applied to pedal boats. The present invention aims to tackle these problems head on and provide a solution to both In a single invention. Two of these smaller cranks rotate about pivots C and two rotate about pivots D which are used to fix the attach cranks A, B to the vessel. The remote end of the rod 29 is pivotally coupled to the circumference of a first wheel 30. A rod 31 is pivotally connected at its ends to the arm 23 and a point on the circumference of a second wheel 32. The two wheels 30, 32 are interconnected by a belt 36 so that the wheels are constrained to be driven in the same direction.
A first rod 3 and a second rod 4 are pivotally coupled at one end to the rim of the disc. The Figure 29 arrangement is more preferable for smaller vessels onaccount of the forces generated in the second. Some preliminary attempts have been made to employ hydrofoils as an aid to conventional propulsion (such as in hydrofoil vessels) or as the means of propulsion in its own right. However, the gears 58-60 are mounted on a frame for movement towards and away from the rods and hydrofoils (i.e. This mechanism derives benefit from being symmetrical either side of the wheel as far as the operation of the hydrofoils is concerned. Figure 17 shows the application of the Figure 11 mechanism to an opposed pair of pivoted rods having pivots located at fixed reference points, whereby the free ends of the rods are caused to oscillate from side to side.
Figure 2 shows an alternative mechanism. Detailed Description of the Illustrated Embodiments Figure 1 a shows a mechanism for causing a vane 1 to be oscillated like a fish tail. The present invention therefore provides mechanisms for causing vanes/hydrofoils to oscillate like a fish tail (i.e. The construction just described for the upper part of Figure 33 is repeated for the lower part, so the lower or “aft” pair of foils is caused to perform their fish tail move meets at the same time but not in phase with the forward pair for reasons already ex plained before. Escalofrios sin fiebre y dolor muscular . During normal operation the foils would never be at 90 degrees to the flow. If the foils describe a motion determined by a sine function, their velocity across the flow is determined by a cosine function. If, say the rotation of wheel 32 causes the hydrofoil 20 to move according to a sine relationship, its velocity follows a cosine relationship.