The passage of fluid beneath the wave follower 1 is prevented by a curved panel 36 at the rear of the wave follower 1, said curved panel having a cross-sectional profile radius concentric to the arc of the leeward side surface 27b of the wave follower 1. A detailed description of each of these components follows. Details of these features and various embodiments will subsequently become apparent when reference is made to the accompanying drawings and descriptive text hereinafter. The conversion of wave motion to useable energy is accomplished by attaching a drive shaft 7 to the lever arm 2, thus with the upward and downward movement of the wave follower 1 the reciprocal action of the drive shaft 7 may be utilized to power a load or a driven device. In all embodiments of the invention the energy transmitted to a driven device via the reciprocal movement of the drive shaft is done so with the incorporation of a cam assembly 33 as shown in FIG.
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As a wave trough 26 approaches the wave follower 1 is caused to fall by the pull of gravity acting upon the contained fluid in the lower body portion 24 and by the combined forces of suction and surface adhesion. Referring to FIG. 2 the operation can be summarized as follows: As a wave crest 25 approaches, the wave follower 1 is caused to rise by the buoyancy of the upper body portion 23 and by the lateral force of the oncoming wave as it comes in contact with the inclined face 27a. Because the lower body portion 24 is open, it is completely filled with fluid which will naturally rise with the wave crest 25 and fall with the wave trough 26. If the lower body portion 24 should lose any fluid on the downward stroke a one-way valve 10 will permit air to be exhausted and the lower body portion to refill with fluid on the upward stroke.
SUMMARY OF THE INVENTION The present invention seeks to provide a relatively economical apparatus for extracting energy from a wave on both the rise and fall of a wave, thus making use of the upward and downward stroke of this device. Referring to FIGS. 9 and 9a, the two stylized drawings illustrate two possible configurations of the present invention. 7, so as not to obstruct the path of the wave.
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In other words the machine is not limited to use on large bodies of fluid and may be installed on inland lakes, streams and ponds. 6,7 and 8 indicate swivel pin 19 to be located closer to the leeward end of the machine than to the windward end of the machine. The upper plate 16 is allowed to rotate freely about a swivel pin 19 and rests on rollers 18 which separate the upper plate 16 from the lower plate 17. In another embodiment of the invention the swivel pin 19 and rollers 18 may be substituted by a set of bearings on a single rotating shaft (not shown). A single large device would be more costly and more difficult to build and maintain in operation. 1, 2 and 3 a wave energy extraction device is shown generally by numeral 40. The device comprises a support structure 5, a lever arm 2 pivotally supported from the support structure 5, and a wave follower 1 fixed to one end of the lever arm 2 and positioned on the body of fluid.
Referring to FIG. 4a and 4b the unique wave follower 1 comprises an upper body portion or flotation unit 23 which is made of any suitable buoyant material, a lower body portion 24 constructed in the form of a hollow chamber 24a, having an opening 24b at the bottom, with a side surface 27a being angled bottom inward, so as to harness the energy of the lateral force of the wave, an opposite side surface 27b and a pressure relief valve 10 located in the top or roof 24c of the hollow chamber 24a. The side surface 27b is curved top to bottom forming an arc of a circle centred at the axis or axle 20 about which the lever arm 2 rotates. The leeward side surface inclined, bottom outward away from oncoming waves to is curved from top to bottom; this curvature forming an arc of a circle centred on the centre point of the axle or fulcrum about which the lever arm pivots, causing a minimum displacement of fluid and therefore little energy transfer between the rear of the wave follower and the fluid.. Como quitar el dolor de espalda media