GB2192671A

GB2192671A - Method and apparatus for harnessing power from the force of waves

Info

Publication number: GB2192671A
Application number: GB08715987A
Authority: GB
Inventors: Hyun Jin Shim
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-07-07
Filing date: 1987-07-07
Publication date: 1988-01-20
Anticipated expiration: 2007-07-07
Also published as: GB8715987D0; JPS6380078A; JPH0585754B2; GB2192671B

Abstract

The movement of a floating bladder 73 caused by the waves is transmitted to a sprocket system 85,99,100 via a rope 74 and chain 75 tensioned by a weight 78, the sprocket system being used to drive an electrical generator (Fig. 5) or a pump for delivering liquid to a high- level reservoir (Fig. 6). In the embodiment shown the sprocket system is mounted on a buoyant platform 71 maintained at a fixed depth below the surface. In other embodiments, the movement of the floating bladder is instead transmitted to a pulley which is mounted on an immersed buoyant platform (Figs. 3 and 4) or is mounted to a framework fixed to the sea bed (Figs. 1 and 2). <IMAGE>

Description

SPECIFICATION Method and device for generating electric power by use of wave force FIELD OF THE INVENTION The invention relates to a method and device for generating the electric power using the force of waves produced on the sea level, and particularly a method and device for generating the electric power by the use of wave force, which is destined to generate the electric energy by making the floatation bladders risen on the water surface to rise and fall repealtedly using the difference of heights between the ridges and troughs of waves produced continuously, rotating the pulleys set up in a certain depth under the sea level by means of periodic up and down motion of the floatation bladders, and driving the generators by the power changed in speed through transmission gears.

BACKGROUND OF THE INVENTION It is well known that the sea has always waves caused by a meteorological action, and such waves vary in size because the height, length, cycle, speed, etc. of waves are changed from time to time, but they have usually a course to advance from the offing toward the seashore.

Accordingly, various proposals and attempts are recently made on a device for generating the electric power by catching and using waves produced repeatedly without interruption with the said wave height, wave length and wave-cycle, and converting them into energy.

There are two kinds of conventional oceanic energy conversion modes: one is destined to make the floatation bladders to rise using the difference between the ebb and flow of the tide, to operate the piston pump, etc. by the rising force to suck the sea water up to a certain height, and then to rotate the turbine for production of electric power using the head of thus sucked sea water; the other is to make the floatation bladders rise by their own rising force at high tide, the sea water to be stored in the floatation bladders at low tide, the floatation bladders to fall under the weight of the sea water, a separate fluid pressure means to be operated, and to obtain the power for generating electricity by a fluid ran out of the fluid pressure means.

However, the above-mentioned conventional device for generating electric power has problems in that it is restricted by the place of installation so that it may be installed only near the inshore contiguous to the seashore, and that the overall construction of the device is too complex and incomplete to be put to practical use.

SUMMARY OF THE INVENTION The principal object of the invention is to provide a method and device for generating electric power by use of wave force, which has not such problems as the conventional method of generating electric power.

It is another object of the invention to provide a method and device for generating electric power, which is destined to apply efficiently not only in the inshore, but also in the deep sea.

It is a further object of the invention to provide a method and device for generating electric power by use of wave force, which is destined to convert efficiently a kinetic energy of waves produced in the inshore and deep sea into an electric energy by means of simple apparatus and easy method of installation.

In one aspect of the invention, the device for generating electric power comprises a supporting means installed in a fixed depth from the sea bottom or sea surface, a pulley mounted rotatably by the supporting means, a floatation bladder floated on the sea surface for rising and falling along the wave-height, a wire rope connected between the floatation bladder and the weight and wound up around the pulley so as to make the pulley rotate according to the up and down movement, and variable transmission gears for converting the rotation force of the said pulley and driving the device for generating electric power or compression pump.

According to the invention composed as described above, it is formed in such structure that the rise and fall of the flotation bladders, which is effected repeatedly along the height of waves produced without cease draws the wire rope and thereby rotates and drives the pulley. Therefore it is possible to simplify the construction of means for generating the power and to make the execution of work simple and easy. Moreover, the rise and fall of the floatation bladders driving the pulley is effected with such short cycle as the moving cycle of waves which are the power sources, the momentum of waves is almost captured for use without failing to catch very small movement of waves, and the pulley is rotated and driven with almost the same magnitude as the momentum of waves. Accordingly it is possible to inprove the efficiency of wave utilization.

According to an embodiment of the device for generating electric power by use of wave force, even in a case where many floatation bladders and pulleys are installed in the deep sea, it is of installation structure to be mounted on a frame which is a supporting means rising to a predetermined position under the sea surface, so that the execution of work is very simple and easy, and it is possible to maintain stably the installing position of the frame at all times independently of the rise and fall of each floatation bladder which is effected continuously.

In another aspect of the invention, the device for generating electric power comprises a rotary shaft and a generator installed in the fixed depth, a floatation bladder floated on the sea surface for repeating the rise and fall movement, and a chain for transmitting the rise and fall of the floatation bladder.

According to the invention composed as described above, the floatation bladders rise and fall by waves advancing continuously and repeatedly on the sea surface, and the rise and fall movement is transmitted through the rope and chain to a chain pulley connected to the driving shaft gear of transmission and the chain to drive the generator by variable rotation force, so that it is possible not only to reduce the unit cost of electric power by simplifying the construction of power generating means, but also to convert a kinetic energy of waves into an electric energy with the loss of energy minimized by transmitting efficiently the kinetic energy of waves to the generator.

BRIEF DESCRIPTION OF DRA WINGS Embodiments and operational effect of the invention will now be described in more detail, by way of example, with reference to the accompanying drawings. In the drawings, Fig. 1 is a side view illustrating an embodiment of the invention, Fig. 2 is a side view illustrating another embodiment of the invention, Fig. 3 is a partial side view illustrating further embodiment of the invention, Fig. 4 is a partial plan view of Fig. 3, Fig. 5 is a diagram illustrating the construction of the electric motor and the device for generating electric power according to the invention, Fig. 6 is a diagram illustrating another method of generating electric power according to the invention, Fig. 7 is a partial elevation view illustrating another embodiment of the invention, Fig. 8 is a partial enlarged view of Fig. 7, Fig. 9 is a plan view illustrating a combination of many devices of Fig. 7, Fig. 10 is a disassembled perspective view showing the part B of Fig. 9, Fig. 11 is a sectional view taken along the line A-A in Fig. 8, Fig. 12 is an enlarged view showing the part A of Fig. 8, Fig. 13 is an elevation view illustrating the connection between the floatation bladder and the rope, Fig. 14 is a longitudinal sectional view of the floatation bladder, Fig. 15 is a plan view of partial cut-off floatation bladder.

DETAILED DESCRIPTION OF THE INVENTION As is shown in Fig. 1 which illustratep an embodiment wherein the device for gerierating electric power by use of wave force according to the method of the invention is installed in the inshore having a depth of about 9-15m, a concrete base 1 is laid on the sea bed, a supporting framework 2 having a fixed height is installed on the upper side of the concrete base 1, and a support member 3 secured to an upper part of the supporting framework 2 is provided with a pulley 4 which is located in a depth of about 3-4m under the mean sea level.

Subsequently, a floatation bladder 5 having a required buoyant force (approximately 1-3 tons) is floated on the sea furface, and the floatation bladder 5 is connected at the middle of its bottom to an end of a wire rope 6 having a fixed length, and after winding one time round the said pulley 4, the extended end of the wire rope 6 is connected and fixed to a weight 7 (about 200-500 kg).

The bottom of each floatation bladder 5 rising on the sea surface is connected to one end of two other anchor ropes 8 (only one is shown in the drawing) and the other end of each anchor rope 8 is connected and fixed to anchors 9 (only one is shown in the drawing) secured in a space to the front side of the supporting framework 2 on which the said pulley 4 is mounted, that is, to both sides of the sea bottom in the main advancing direction of waves as shown by the arrow, so that the floatation bladders 5 rising on the sea surface do not move horizontally according to the advancing direction of waves, but operate only in the up and down direction.

When anchors are installed, it is preferable to locate the position of anchors 9 in which each rope is secured, one both sides in a distance equivalent to about 1.2-1.5 times of the depth (9-15m) from the supporting framework 2 on which the said pulley 4 is mounted, and to maintain the angle between both anchor ropes 8 with the connecting part of floatation bladders 5 as a center in about 30-40".

Thus mounted pulley 4 is destined to rotate counterclockwise and clockwise as the up and down movements of floatation bladders 5 are repeated. According to the invention the power is generated using the rotation force of pulley 4 produced when the floatation bladder 5 obtains an upward bouyant force.

Fig. 5 shows an example of the power transmission process according to the rotation of pulley 4 as described above, in which on the other upper part of the supporting framework 2 on which the said pulley 4 is mounted, are mounted the transmission 30 and the electric generator 40, respectively, and the edge of input shaft 31 passing outward through one side wall of the transmission 30 and the edge of the rotary shaft 4a of pulley 4 are connected by a motor-operated clutch.

At the end of input shaft 31 located in the interior of the transmission 30 is mounted an input gear 33, which is engaged with a oneway gear 34 destined to rotate only when the said pulley 4 and the input gear 33 rotate by the rising force of the floatation bladder 5, and at the other end of the shaft 34a on which the one-way gear 34 is mounted, the first interlocking gear 34'. On the other hand, the other side wali of the transmission 30 is provided with an output shaft 38a, and the second, third and fourth interlocking gears 35, 35'; 36'; 37, 37' for changing the rotation force and speed of the said pulley 4 so as to become such one as required for driving of the electric generator 40 are mounted one after another between the output gear 38 secured to the interior end of the output shaft 38a and the said first interlocking gear 34'.

Furthermore, the exterior end of the output shaft 38a of the said transmission 30 is connected to the end of the driving shaft 41 of the electric generator 40 through the motoroperated clutch so that the electric generator 40 is driven directly by the rotation force increased through the said transmission 30 to generate electric power.

However, according to the said device for generating electric power, or in other words, according to a device generating electric power which is, according to the invention, destined to generate the power using the rotation force of the pulley 4 produced by the upward bouyant force of the floatation bladders 5, and to be transmitted the power through the one-way gear 34 of the transmission 30, the driving force necessary for generating the electric power is transmitted not continuously but intermittently, and accordingly the electric power produced by the electric generator 40 is also put out intermittently.

Therefore, the electric power is first stored in a storage battery 50, and in a case of need, it is possible to use the electric power charged in the storage battery 50.

The aforementioned embodiment is to put out in increased speed the power generated according to the invention through the output shaft 38a of transmission 30, to drive thereby directly the electric generator 40, and to generate the electricity. However, the invention may be applied to any ordinary mode for generating electric power in which as illustrated in Fig. 6, a piston pump 60 is driven by the power transmitted to the output shaft 38a of transmission, and the sea water is pressed out to and stored in a dam or reservoir constructed at the seashbre by means of the sucking and compressing action of the piston 61 so as to use the head of stored sea water. Moreover, the invention is not limited to the above-described emobidments, but it is possible to adopt other modes of generating electric power as applied according to the principles of the invention.

Fig. 2 shows another emobidment in which the device for generating electric power according to the invention is installed in the vicinity of the inshore as described above. According to the emobdiment, a supporting pole 11 is erected vertically on the concrete base 1 laid under the sea bed of the sea bottom, and on the top of the pole 11 is mounted a pulley 4 as described above, and the pulley 4 is located in depth of about 1m under the mean sea level so as to rotate freely in any direction from the pole 11 as a center.

One end of the operation lever 12 having a fixed length (about 5m) is secured to the rotary shaft 4a in which the pulley 4 is fitted as described above, and the other end is connected to the floatation bladder 5 rising on the sea surface by a wire rope 13 having short length (about 1m).

Accordingly the floatation bladder 5 is destined to rotate round the pole 11 with a fixed radius having the pole 11 as a center in the advancing direction of waves and to repeat only the rise and fall in the upward and downward direction along the height of waves in a state located in the opposite direction of the advancing side of waves. The operation lever 12 connected to the rotary shaft 4a of the pulley 4 is travelled upward and downward with the rotary shaft 4a as acenter, and the pulley 4 is also rotated clockwise and counterclockwise, and it is thereby possible to obtain the power to drive the transmission 30 and the electric generator 40 or the piston pump 6, as described above.

Fig. 3 and Fig. 4 show further embodiments in which the device for generating electric power according to the invention is installed in the deep sea having depth of about 150120m.

The reference number 20 in the drawings represents a frame installed in a fixed depth (about 9-10m) under the mean sea level for mounting the floatation bladder 5 and pulley 4 as described above. The frame 20 comprises a plurality of hollow support pipes 21, 21' of a predetermined dimension which are arranged in a form of lattice with a certain space on the same plane. On the frame 20 are mounted a plurality of floatation bladders 5 and pulleys 4 having such construction as described in the first embodiment by means of respective supporting framework 2.

The fram 20 is destined to locate always in a proper position under the water surface, in other words, in the depth of about 9-10m under the mean sea level by the buoyant force of the hollow formed interior of each supporting pipe 21, 21' connected longitudinally and latitudinally to each other and the air bladder 22 mounted in a fixed position on the supporting pipes 21, 21" and rising on the sea surface.

It is practicable by making the entire load applied to the frame 20 to be equal to the total buoyant force acting by the sum of the self-buoyant force of the hollows of each sup porting pipes 21, 21' and the bouyant force of the air bladders 22.

In the plane space between supporting pipes 21, 21' arranged with a certain space as described above, is mounted at one side a rectanguiar load box 23 of a fixed dimension open to the bottom so that the frame 20 is prevented from floating upward and downward as a whole due to a force acting at the time when each floatation bladder 5 on the top of the wire rope 6 wound around the pulley 4 located in the upper part rises following the waveheight.

On the other hand, a frame 20 is mounted in such way that the frame 20 and the anchor 9 secured to the sea bed of sea bottom are connected each other by an anchor rope 8 or chain so that the frame 20 is prevented from a horizontal travelling beyond a certain distance by the force of waves, and is movable along the advancing direction of waves in the limit of the radius of the anchor rope 8.

Since each floatation bladder 5 connected to the said pulley 4 via the wire rope 6 is connected by other wire ropes 24, 24' one end of which is fixed to the supporting framework 2, it is prevented from a horizontal travelling beyond a certain distance in the advancing direction of waves and also from rising and falling according to the difference of waveheights, and on the rotary shaft 4a of each pulley 4 are mounted the transmission 30 and electric generator 40, respectively, so as to generate the required electric power.

The device of the invention with such construction as described in the above-mentioned embodiments, must be installed in such way that a plurality of floatation bladders 5, pulleys 4 and load boxes 23 are mounted on the frame 20, and the frame 20 is mounted so as to maintain always, a state parallel to the mean sea level in the fixed depth under the mean sea level by means of the selfbuoyant force of each supporting pipe 21, 21' and air bladder 22, and thus mounted frame 20 is not allowed to rise together with each floatation bladder 5 when this is rising. To this end. the frame 20 of the device according to the invention is provided with a rectangular load box 23 open to the bottom as described above so as to have a controlling force corresponding to the rising force of each floatation bladder 5. A detailed example thereof will now be described.

In a case where a frame 20 is made by 32m x 64m in size and 2048m2 (4m x 8m) in the total surface area, it is possible to install about sixty floatation bladders 5 on a frame 20.

Considering that the buoyant force B of one floatation bladder 5 is about two tons. and the time in which the rising force acts on each floatation bladder 5 is 3-7 seconds, it is required that the frame 20 is not moved upwards within such time.

Accordingly when the load box 23 installed under the bottom of each floatation bladder 5 is made by 4m in width, 4m in length and 1 m in height, and its specific weight is 1 ton, the full load G of the load box 23 amounts to 16 tons (4 x 4 x 1 x 1), that is, B: 2 tons ( G : 16 tons Wherein the upward buoyant force B acting through each floatation bladder 5 is 2 tons, while the full load of each load box 23 is 16 tons so that the frame 20 is not travelled by the rising action of each floatation bladder 5, but maintained stably at the horizontal degree in a certain depth under the mean sea level.

Moreover, since each floatation bladder 5 is not operated at the same time depending on the difference of deformation cycles of waves, the installing condition of the frame 20 is to be maintained at all times parallel to the mean sea level regardless of the rise and fall of the fioatation bladder 5.

As is shown in Fig. 7, which is a partial elevation view showing a state that a device for generating electric power by use of wave force according to another embodiment of the invention is installed in the sea, and in Fig. 8, which is a partial enlarged-scale view of Fig.

7, the four corners of the lattice-formed frame 7 installed in a fixed depth (about 10m) in the sea are connected to and supported by the anchor 79 fixed on the sea bed through a rope 82, and four air pockets 80 per compartment are mounted on the lattice-formed frame 71 of the rotary column 72 in such manner that the buoyant force acting to the air pockets 80 comes to 1.2 times of the total underwater weight represented by a compartment, and the whole device is not swayed or shaken by a little ocean current of the sea bed without appling an excessive force to the rope 82 connected to the said anchor 79.

The rotary column 72 is supported and fixed rotatably at its lower part by four I-form beam secured to the frame 71. The upper part of the rotary column 72 is formed of Hform beam, while the lower part is formed of a cylindrical tube. The top 72A of the rotary column 72 is connected to the floatation bladder 73 located qn the sea surface by the rope 81, and in the middle of the rotary column 72, an upper arm 84 provided with the pulley 83 and 96 at the top is mounted prependicular to the rotary column 72. Under the said upper arm 84 a lower arm 86 is mounted perpendicular to the rotary column 72. and between the upper and lower arms 84, 86 a reinforcing member 87 is mounted in connection with thein, and in the middle of the reinforcing member 87 a supporting member 88 is mounted perpendicular to the reinforcing member 88.

On the front edge of the supporting member 88 is mounted a rotary shaft 89 of the first sprocket 85 in which the one-way clutch bearing 33 Is interposed, and at the extension of the rotary shaft 89 Is mounted the second sprocket 99 which is connected to the third sprocket 100 mounted on the input shaft 77 of the transmission through the chain 102.

The chain 102 wound between the second and third sprockets 99, 100 is constructed in such a way that the tension is regulated by the tension sprocket 101 formed movably on the lower arm 86.

The stand 92 of the transmission and the electric generator 91 located under the lower arm 86 and mounted perpendicular to the rotary column 72 is connected at its front edge to one end of the upper arm 84 via the turnbuckle 93 and the tie rod 94.

The rope 74 connected to the bottom of the floatation bladder 73 located on the sea surface and extended in vertical direction is connected to the chain 75 above the pulley 83, and the chain 75 passes between the pulleys 83, 96 and winds round the first sprocket 85 and then connected to the plumb 98 having a predetermined weight (about 300kg) through the pulley 97 mounted at the front edge of the lower arm 86.

According to such construction, when the floatation bladder 73 is in the rise and fall motion, the rise and fall is transmitted to the first sprocket 85 via the rope 74 and chain 75 and rotates the first sprocket 85 clockwise and counterclockwise, but the second sprocket 99 rotates only when an upward buoyant force acts on the floatation bladder 73, by means of the one-way clutch bearing 103 inserted in the first sprocket 99. In other words, the second sprocket 99 rotates intermittently in one way, and accordingly the third sprocket 100 mounted on the input side 77 of the transmission and the electric generator 91 rotate also intermittently to drive the electric generator intermittently.

Fig. 12 is a detailed view illustrating the connecting condition between H-form beam 105 forming the upper part of the rotary column 72 and the lower cylindrical tube 104, in which the upper flange 106 and lower flange 107 of the top of the cylindrical tube 104 are connected to each other by four ribs 108 formed around the cylindrical tube 104, and on the surface of the upper flange 106 is welded the lower end of H-form beam 105.

The bottom of the lower flange 107 and the upper part of the cylindrical tube 104 are contacted with and supported by rotatably the upper surface and inner surface of a packing 109 such as teflon, respectively, and at the same time the peripheral surface of such packing 109 is enclosed by a cylindrical hollow steel pipe 110. The lower end of the rotary column 72 is inserted and secured rotatably in a cylindrical fixture 112 formed on the supporting member 111 welded in the middle of four I-form beams supporting the rotary column 72. On the periphery of the part in which the cylindrical fixture 112 is inserted, in other words, on the inside of the fixture 112 is formed a packing so as to make a smooth rotation of the rotary column 72.

As is shown in Fig. 11, the second sprocket 99 is mounted on the axis 89 of the first sprocket 85 in which the one-way clutch bearing 103 is interposed. Consequently, even when the first sprocket 85 rotates clockwise and counterclockwise by the rise and fall of the floatation bladder 73. only the rotation force produced at the moment the upward buoyant force acts on the floatation bladder 73, is transmitted to the second sprocket 99. In other words, when the floatation bladder 73 falls, the first sprocket 85 is out of gear.

As is shown in Fig. 9, which is a partial plan view of the device for generating electric power by use of wave force according to the present embodiment, each frame 71 having one floatation bladder 73 forms as a whole a lattice-form arrangement connected to adjacent frames in all directions on the same plane. In other words, in a fixed position on the frame 71 extended in all directions with the rotary column 72 on the frame 71 as a center is mounted an air pocket 80, so as to provide the frame 71 with the upward buoyant force, and each front edge of the frame 7 1 is couple with the adjacent frame by a wedge 81 and U-form bolt 83 as shown in Fig. 10.

As is shown in Fig. 14, which is a longitudinal sectional view of the floatation bladder 73, and in Fig. 15, which is a partially cutout plan view of the floatation bladder 73, is coupled by bolt with a packing interposed so that the inner part of the floatation bladder is sealed completely to prevent the sea water from flowing into it.

As is shown in Fig. 13 and Fog. 15, in the middle of the bottom of floatation bladder 73 is attached by bolts a rectangular plate 114 for connecting the ropes, and in the middle of the plate 114 are formed on both sides the first coupling member 115 for coupling with the rope 74 connected to the chain 75 and two second coupling members 116 for coupling with the rope 81 connected to the front edge 72 A of the rotary column 72. The first coupling member 115 and the second coupling with members 116 are connected to ropes through shackles 117, and the rope 81 connected to the front edge 72A o-f the rotary column 72 is divided into two ropes at the lower part of the floatation bladder 73 and each rope is connected to the second coupling member 116, respectively.Accordingly, the floatation bladder 73 on the sea surface remains at all times in the line of apsides perpendicular to the direction of the wind by means of the rope 74 extended downward vertically from the first coupling member 115 on the bottom and the rope 81 connected to the front edge 72A of the rotary column 72 from the second coupling member 116.

In other words, all fioatation bladders 73 located on the sea surface are arranged in the line of apsides perpendicular to the advancing direction of waves.

As described above, the power is transmitted to the transmission and the electric generator 91 only when the upward buoyant force acts on the floatation bladder 73, and accordingly the electricity produced out of the electric generator is also put out intermit tentiy. Therefore the electricity is stored first in the storage battery and when needed, it is possible to use the electricity changed in the storage battery. At this moment the casing 91A in which the transmission and the electric Senerator 91 are contained, is sealed completely and filed with the compressed air so as to maintain in the interior of the casing 91A the pressure equivalent to 1.2 times of the hydraulic pressure applied to the water depth, and the sea water is thereby prevented from flowing in the casing 91A of the said transmission and the electric generator 91.

According to this embodiment, it is destined to put out the power produced according to the invention with the speed increased through the transmission, and thereby to drive directly the electric generator to generate the electricity, but in embodying the invention, it is also possible to drive the piston pump or air compressor with the power transmitted to the output side of the transmission and thereby to convert it into a power utilizable actually for the human life.

As described above, this embodiment is destined to obtain the required power using the floatation bladder 73 rising and falling repeatedly without interruption with waves as power source and the rotation force of gears connected to the floatation bladder 73 through the rope 74. Therefore it is possible to simplify the construction of the means for generating power and the supporting means thereof and to make the execution of work simple and easy. Moreover, since the floatation bladder 73 is almost restrained from moving transversely by two ropes without regard to the magnitude of waves, and the line of apsides of the floatation bladder 73 is always perpendicular to the advancing direction of waves, it is possible to convert efficiently the kinetic energy of waves into an electric energy.

Particularly, even in a case where the device of the above-described embodiment is installed in the deep sea, the base frame supporting it is not installed on the sea bottom, but in a fixed depth under the sea surface, and in such a state, it is possible to maintain stably at all times the location of installation and thereby to provide advantages that the maintenance and repair as well as the work of installation are easy.

Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims in the invention may be practices otherwise than as specifically described.

Claims

1. A method of generating electric power by use of wave force, characterized by making the floatation bladders on the sea surface to rise and fall using the undulatory motion of waves, producing the power by rotating the pulley in the water by means of the traction power acting on the wire ropes at the time of rise and fall of the floatation bladders, and generating the electricity by transmitting the power to the electric generator through the transmission.

2. A device for generating electric power by use of wave force, characterized in that it comprises a supporting framework installed on the sea bed, a pulley mounted rotatably on the bearing of the top of the said supporting framework, a floatation bladder floating up on the sea surface, a wirerope secured at one end to the bottom of the floatation bladder and wound in the middle part round the pulley a weight suspending at the downward extended end of the wirerope, an anchor rope extended downward obliquely from the bottom of the floatation bladder, an anchor securing the said anchor rope to the sea bed, a transmission connected to the rotary shaft if the said pulley, and an electric generator connected kinematically to the transmisaion.

3. A device for generating electric power by use of wave force as claimed in Claim 2, characterized in that the said pulleys are disposed in a fixed space on the frame consisting of a number of hollow support pipes connected in a lattice-form to each other, and on the said frame are mounted a number of air bladders and load boxes so as to maintain the base frame horizontal to the mean sea level in a fixed depth under the mean sea level

4. A device for generating electric power by use of wave force as claimed in claim 2, said pully is disposed in a predetermined interval on the frame supported by a plurality of hollow supporting pipes, a plurality of air pockets and load boxes being mounted on the frame to keep the base frame at a predetermined depth under mean sea level in parallel with the sea surface.

5. A device for generating electric power, characterized in that it comprises a latticeshaped frame installed in a fixed depth under the mean sea level, a rotary column mounted on the said frame, a floatation bladder floating up on the sea surface and carrying out the rise and fall, a rope and chain for transmitting the rise and fall of the floatation bladder to the transmission and the electric generator, a number of sprockets rotating in gear with the chain, and an air pocket for applying a rising force to the whole device, and four corners of the sald lattice-shaped frame are secured to the sea bed through the anchor rope.

6. A device for generating electric power by use of wave force as claimed in Claim 5, characterized in that the said rotary column is installed rotatably in the advancing direction of waves, and the free end on the upper side of the rotary column and the floatation bladder are connected to each other through a rope so as to maintain at all times the line of apsides of the floatation bladder perpendicular to the advancing direction of waves.

7. A device for generating electric power by use of wave force as claimed in Claim 5, characterized in that it is composed in such a way that the buoyant force of four air pockets per compartment amounts to 1.2 times of the total underwater weight of one compartment.