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The hydroplanes 180, 181 are mounted on a support structure shown schematically at 183 which in turn is pivotally mounted on an upper end 164 of second arm 160. The linkage means 20 is constructed so that the motion executed by the support structure 183 carrying the hydroplanes 180, 181, under the influence of the current A, is along a linear movement path BB which lies along line BB. In an alternative asymmetrical arrangement, an upper end of one of said second arms is pivotally attached to the hydroplane support structure and the upper end of the other of said second arms is pivotally attached to the said one second arm. The hydroplane support structure may contain at least a part of the means for adjusting the angular orientation of the (or each) hydroplane. Fig 13) indicated at 440a and 441a. Upper ends of first arms 440, 441 are pivotally connected to lower ends of second arms 260, 261. Upper ends of second arms 260, 261 are pivotally connected to hydroplane support structure 283. A hydroplane support linkage 284 acts to maintain the hydroplane support in a nominally vertical orientation.
The first arms 240, 241 are pivotally attached at their second (upper) ends to respective lower ends of second arms 260, 261. Upper ends of arms 260, 261 are pivotally connected at points 263,264 respectively to hydroplane support structure 283. A hydroplane support linkage 284 is provided to ensure that the hydroplane support structure 283 is maintained in a desired orientation, most especially substantially vertically as illustrated.
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Means (not specifically illustrated in Figures 1, 2 and 3) are provided for extracting power from the movement of the hydroplane 18. Most typically such means are connected to one or more of the arms 14, 16, preferably the first arms 14a, 14b. Dolor lumbar y cadera irradiado a las piernas . Typical power extraction means may be an electro hydraulic arrangement although a form of direct drive and gearbox or a constant pressure linkage adapted to work against a fixed head may also be suitable. Alternatively, a common adjustment means may be used to adjust all the hydroplanes, but the specific change in angular orientation may not be the same for each hydroplane. Thus the specific angular orientation of the hydroplane can be adjusted in accordance with, for example, prevailing conditions such as the speed of the incident current. The hydroplane 18 is thus decelerated and then accelerated in a downward direction so that it moves downwardly along movement path B. Similarly, as the hydroplane 18 approaches the lower limit of its motion (as illustrated in Figure 1) the angular orientation of the hydroplane 18 is changed so that the current flowing over the hydroplane 18 generates a thrust in an upward direction.
The body is arranged in a current of water and the angle of the hydroplanes with respect to the current is adjusted at predetermined times thereby to change the direction of the thrust from the current on the hydroplanes, so that the body oscillates. Figure 7 shows on an enlarged scale a part of an apparatus 200 similar to that of Figures 5 and 6, and illustrating one example of a means for adjusting the angular orientation of the hydroplanes 280, 281 and 282 (hydroplane 282 is not shown on Figure 7). The arrangement is, of course, suitable also for moving a single hydroplane, two hydroplanes or more than three hydroplanes, with appropriate modifications. Figure 12 shows an arrangement for adjusting the angular orientation of a plurality of hydroplanes which, like the arrangement in Figure 11 has a drive arrangement comprising a cable 331 which is driven by rotational drive means 330 and which drives a pulley or the like 333. Pulley 333 is rotatably connected to a shaft 290a on which a hydroplane (not shown) is mounted.