The present invention relates to a parking space protecting device.

Very often it is desirable to have a device which prevents, in a public parking place, entering of unwanted persons and more important, in a private parking place prevents the theft of a car and parking of an unauthorized person.

There are known such devices such as described e.g in US Patents Nos. 4,941,284, 5,146,710, 5,165,200 and 5,281,007. However these known devices are rather complicated and expensive as they require an outside energy source such as: electric source, a water pressure, handle care, etc. Moreover, most of the known devices require an electrical eye for indicating when the car has passed and thus the device may be closed again.

There are also known IS patents 44562 and 59923. However, the devices according to these Israeli Patents relate to producing energy and not to a parking space protecting device and are specifically constructed to produce said energy.

It has therefore been desirable to design a device for the above object which overcomes the above disadvantages, i.e would be simple to manufacture and use, would not be too expensive and would have the required properties, e.g use the energy of the passing car.

The present invention thus consists in a parking space protecting device using the energy of a pressing element, said device being provided with: a. at least one first compressing and releasing means, being movable against pressure; b. first one-way valve(s); c. second one-way valve(s); d. storage means for a compressible fluid; e. an hydraulic or pneumatic tap which is connected to suit¬ able actuating means; f. a second compressing and releasing means; and g. a barrier;

said parts being suitably connected in turn to each other by pipes, the flow of the compressible fluid being provided in said pipes and originating from the action of the first compressing and releasing means.

A pressing element may be for example any vehicle.

The compressible fluid in the device according to the present invention may be compressed air or liquid under high pressure e.g. mineral oil under high pressure.

The compressing and releasing means may be: a piston comprising slidable means, said slidable means being located within the piston vessel or the like; said piston comprising advantageously springable means, being movable against pressure; an inflatable pillow comprising an entrance and exit path for the compressible fluid, optionally comprising springable means; a cylindrical device, closed hermetically at its upper side by a flexible diaphragm, said device advantageously comprising springable means; etc.

The springable means, if present, may be located above each of the above options . However, they are preferably located below the slidable means of the piston(s) or beside the inflatable pillow or below the flexible diaphragm in the cylindrical device. It is readily understood that the present invention, if it is constructed according to either of the above options, is not restricted to same and the springable means may be located in any other suitable place, where the desired effect is achieved.

The springable means may consist of any suitable means, e.g. be a further regular piston, a piston operating in vacuum, etc. Advantageously springs are utilized.

The inflatable pillow, if present, has advantageously the form of an isosceles triangle, wherein the base is vertical to the road, however is not restricted to said form.

The slidable means, if present, may be composed of one or more parts.

The second compressing and releasing means is preferably smaller than the first ones.

The storage means, if they are for compressed air, is

preferably a tank. The pressure in said means may be , e.g.l-lOatm. However, the present invention is not restricted to said means and the compressed air may be stored also in one of the other parts of the device, i.e in the second one-way valve(s) , in a flexible pipe extending from the second one-way valve(s), etc., which then also constitute the storage means.

The storage means, if they are for a liquid under high pressure, are pressure storage means, which advantageously are a container comprising a spring and a diaphragm. The pressure in said means may be , e.g. 1-lOatm. Moreover, a liquid basin advantageously being connected at one side to the first one-way valve(s) and on the other side via a tap to the second compressing and releasing means is suitably a part of the device.

When the compressible fluid in the device according to the present invention is air it may be supplied from the outside or from the inside of the device.

When the compressible fluid in the device according to the present invention is a liquid it may be supplied either from the pressure storage means or from the liquid basin via the pressure storage means.

In case that the compressible fluid is air or a liquid forwarded from a basin, said one-way valves being opened toward the second compressing and releasing means for the compressible fluid e.g. the one-way valves extend from each of said first compressing and releasing means for example are located at the end of the first compressing and releasing means preferably opposite the storage means, if present. The compressed fluid may then be sucked through the first one-way valve(s) as the result of the action of the first compressing and releasing means. The second one-way valve(s) in this case may be located either within the springable means, if present, or between same and the storage means, if present. Said set of one-way valves will be designated where required as set I.

In case that the liquid is supplied from the storage means the pipes (A) extending from each first compressing and releasing means are splitting off at an injunction in two directions. The first one-way valve(s) being located between the splitting injunction and the tap and the second one-way valve(s) being located between the splitting injunction and the storage means. Said set of one-way valves will be designated where required as set II.

Should two first compressing and releasing means be present in the above later case, said extending pipes (A) preferably form one pipe and in this case two splitting injunctions are advanta¬ geously present.

Two sets of valves may be present according to the present invention, e.g. set I and if desired set II.

In case that in said embodiment i.e. having sets I and II exist two first compressing and releasing means said first one-way valves (set I) being located on an additional pipe (B) connecting said two means and the second one-way valves being located on each first pipe (A) extending from each of said means.

In case that in said embodiment i.e. having sets I and II there exists only one first compressing and releasing means said first one-way valve (set I) being located on additional pipe (B) extending from the first compressing and releasing means, said additional pipe (B) being connected to the first pipe (A) extending from said means and the second one-way valve being located on the first pipe (A) extending from said means.

The actuating means of the tap are preferably an electric source which is advantageously a battery or a battery loaded, if possible, by a generator, a dynamo, or the like which in turn is operated by the movement of the car and by additional actuating means. However said tap may be actuated also manually by a pressure difference.

The additional actuating means may be any suitable one e.g. a remote control, a magnetic card, secret code, a sensor, etc. Said additional actuating means may cause the opening and/or closing of the barrier.

Said sensor may be present between the first compressing and releasing means and the second one-way valve(s), indicating when the car has passed the slidable means of the piston or the inflatable pillow.

A known remote control system consists of a controller and a receiver. The receiver according to the present invention may be an electrical receiver which may be present between the hydraulic or pneumatic tap and the electrical source e.g the battery of the device. Said receiver may have other functions, e.g. serve as an alarm device, etc.

The opening or the closing operations of the barrier is a

function of the construction of the device according to the present invention. The barrier consists of at least one part, preferably it consists of 1 or 2 parts.

The device according to the present invention may comprise also a metallic pin when the actuating means are electric ones. Said pin is connected to said electric means via a coil. However, it is readily understood that said pin may be actuated also by hydraulic, pneumatic or any other suitable means. The pin causes the stability of the barrier i.e. when external force by an unpermitted person is applied the barrier will not move. The pin may be actuated by the electromagnetic influence of the electric actuating means of the tap. Said pin operate preferably by in¬ duction.

The pressure in the first compressing and releasing means of set I may be e.g. 0.25 - 4 atm.

The pressure in the second compressing and releasing means of set I may be e.g. 1 - 4 atm.

The valves, pistons, storage tank and/or container and basin may be made of any suitable material, a non corrosive metal, e.g. steel etc,a rigid plastic material, e.g. polycarbonate, ABS etc.

The inflatable pillow, the diaphragm of the cylindrical device and/or the diaphragm of the container can be made from any flexible material such as: rubber, vulcanite, polystyrene etc.

The device according to the present invention may be con¬ structed in many variations. Various variations are described hereinafter, for easy understanding, for the possibility that the compressing and releasing means are piston(s) and its parts, however it is well understood that said variations are not restricted to the use of said piston(s) which may be replaced, e.g by the inflatable pillow(s) or cylindrical device(s) comprising in their upper side a flexible diaphragm, or combination thereof. However, as it is easily understood the present invention is not restricted to said variations. Moreover, all said variations, unless stated otherwise, are for the possibility that the compress¬ ible fluid is air and it is supplied from the outside. Furthermore, all said variations, unless stated otherwise, are for the possibil¬ ity that the first and the second one-way valves are of set I.

In the first variation, one part is located on the road or thereunder which part consists as one element which comprises the

first piston, and the sliding means. The upper part of these means and the first one-way valve have in any case to be located upon the road. The springable means and the second one-way valve are connected through a pipe to a housing, being placed at an angle, preferably of 90°, in relation to the first piston, which comprises the storage means, e.g. the tank, the hydraulic or pneumatic tap and the electric source. Said tap is connected to the barrier through the second piston by the sliding piece. The housing is connected also to the barrier, by any suitable connecting means such as screws, axis etc.

In the second variation, the entire device may be constructed as one element located on the level of the road or thereunder as follows:

In said element the barrier, the top of the sliding means and the first one-way valve have in any case to be above the road. The springable means and the two one-way valves are located within the piston, which piston is connected through a pipe to the storage means, e.g. a tank, and from there to the hydraulic or pneumatic tap, and the electric source. The storage means are connected by another pipe to the second piston. This element is connected to the barrier, i.e. at one place via the second piston by the sliding piece and at a second place by any suitable connecting means, e.g. screws, axis, etc.

The opening of the barrier in this alternative may be achieved by pressing the element downwards, i.e. the vehicle passes over the element pushing downwards the first piston. Another possibility is that the barrier when opened may be "closed" towards the element i.e the barrier will be put on the element and the vehicle passes over the barrier which pushes the first piston downwards.

In this case the barrier may constitute the device and comprise all parts thereof besides the slidable piece of the second piston which is connected to the road by an axis.

In the third variation the entire device may also be con¬ structed as one element which is located on the level of the road. In this variation the element is built as a trapezoidal like unit. The two first pistons are connected to the first one-way valves. The first pistons are also connected in a diagonal position to the two side ribs of the trapezoid. Said ribs are parts of the sliding means of the first pistons. (The ribs and the other sliding means

may be formed as one or more parts being connected to each other. ) The sliding means move in the piston vessel, wherein the springable means are also located. However, said springable means may also be connected to the side ribs. Each first piston is connected to an one-way valve which valves are connected by a pipe to the same storage means e.g the tank, and from there to the hydraulic or pneumatic tap and the electric source. Said tap is connected to the barrier via the second piston by a sliding piece. The barrier is located on the top rib of the trapezoid.

In the fourth variation the entire device may also be constructed as one element located on the level of the road. Said element is in this variation also built as a trapezoidal like unit. However, in this variation the two side ribs constitute the sliding means together with a part of the pistons comprising or being connected to the first one-way valves. Said pistons comprise springable means located together with two first pistons below said ribs. Each first piston is connected to an one-way valve. Both one¬ way valves are connected as in the third variation to the same storage means.

The device according to the present invention operates, when the air is supplied from the outside, i.e. in accordance with the above four variations, as follows:

The compressed air which is obtained by the action of the first compressing and releasing means whenever any vehicle passes over it and pushes it, is passed through the one-way valve(ε) to the storage means (if present), and from thereon via the tap, which tap is connected preferably to a suitable electric source and actuated by any suitable means, to said second compressing and releasing means which is connected to the barrier and opens or closes same. Optionally, if the compressing and releasing means are pistons, when the vehicle has passed over the sliding part of the first piston(s) , (two clicks i.e. of the front and of the back wheels, the second click may be indicated by a sensor) the tap is opened and air escapes from the second compressing and releasing means and the barrier is closed or opened. Alternatively the barrier may be opened or closed by any other suitable means, e.g. by the action of a timer; a command from a remote control; etc.

It is readily understood that in the device according to the present invention wherein the air is supplied from the outside it

is sucked in and escapes at the end of the operation.

As indicated above the air may be sucked from the inside of the device. In this case a fifth variation of the device according to the present invention, which is similar to the fourth variation, comprises in addition to the parts indicated so far two vertical plates connecting the upper rib to the basis thus forming a closed unit; pipes connecting the first one way valves to said closed unit; and the second piston being provided with an additional valve for releasing the air inside the closed unit while lifting the barrier.

It is well understood that in this fifth variation the storage tank, the hydraulic or pneumatic tap and the second piston are located inside the closed unit, whereas the other parts are located outside thereof. Due to the fact that most of the barrier is located outside of the closed unit and only a small part thereof inside, said closed unit is not totally sealed from the environment but decrease undesired side effects which are caused at the outside, e.g weather influences; dirt; etc.

The device according to the above fifth variation, when the air is supplied from the inside, operates as follows :

It operates in a similar manner as the open system with the difference that the first one-way valve(ε) are connected via a further pipe to the closed unit which is substantially not open to the environment. Therefore, there is an air turnover between the different units - air is sucked from the closed unit to the first compressing and releasing means and releasing air to said closed unit by the second pressing and releasing means through the additional valve which maintains the desired pressure.

The sixth, the seventh and the eighth variations described hereinafter are different from the previous variations in that the compressible fluid is a liquid i.e a mineral oil.

In the sixth variation the storage means for compressed compressible fluid are replaced by pressure storage means for a liquid under high pressure, which advantageously are a container comprising a spring and a diaphragm.

In the embodiment of the invention according to the sixth variation whenever an element is passing above the first compress¬ ing and releasing means, mineral oil is sucked from same to the pressure storage means via the second one-way valve (set II) . By

said action the pressure in the pressure storage means is in¬ creased. When the barrier is to be lifted the mineral oil flows from the pressure storage means to the second compressing and releasing means via the tap, which in turn causes the barrier to be raised. The mineral oil which is located at the other side of the second compressing and releasing means returns thereafter via the tap and first one valve (set II) to the first compressing and releasing means. The tap is connected to the actuating means e.g. an electric source. For descending the barrier the tap is brought to its original position which causes the mineral oil to flow from the pressure storage means, via the tap, to the second compressing and releasing means, advantageously the upper part thereof. The mineral oil present in the second compressing and releasing means, advantageously in the lower part thereof, flows via the tap and first one valve (set II) to the first compressing and releasing means.

In the seventh variation in addition to the pressure storage means, which advantageously are a container comprising a spring and a diaphragm a liquid basin is present which is advantageously connected at one side to the first one-way valve and on the other side via a tap to the second compressing and releasing means.

In said embodiment of the invention the mineral oil is sucked from the liquid basin through the first one-way valve(s) . When the barrier is to be lifted the mineral oil flows from the pressure storage means to the second compressing and releasing means which in turn raises the barrier. The mineral oil returns thereafter to the liquid basin.

In the eighth variation only pressure storage means are exist. However, in this combination two sets of one-way valves namely set I and set II are present.

Said embodiment is illustrated for illustrative purpose only in connection with two first and compressing and releasing means, (means a and b) .

In the embodiment of the invention according to the eighth variation whenever an element is passing above the first compress¬ ing and releasing means mineral oil is sucked from same. Said oil is sucked from one of the first compressing and releasing means (a) to the pressure storage means via second one-way valve(s) of set I and second one-way valve of set II and from the other first

compressing and releasing means (b) to the upper first compressing and releasing means (a) via the first one-way valve(s) of set I, the additional pipe and first one-way valve of set II to the pressure storage means. By said action the pressure in the pressure storage means is increased. When the barrier is to be lifted the mineral oil flows from the pressure storage means to the second compressing and releasing means via the tap, which in turn causes the barrier to be raised. The mineral oil which is located at the other side of the second compressing and releasing means returns thereafter via the tap and first one valve of set II to the first compressing and releasing means, i.e to one first compressing and releasing means (a) in a direct manner and to the other first compressing and releasing means (b) via the first compressing and releasing means (a) and additional pipe (B) . For descending the barrier the tap is brought to its original position which causes the mineral oil to flow from the pressure storage means to the second compressing and releasing means, advantageously the upper part thereof, via the tap. The mineral oil is caused to flow from the second compressing and releasing means, advantageously the lower part thereof, via the tap and first one valve of set II to the first compressing and releasing means, i.e to one first compressing and releasing means (a) in a direct manner and to the other first compressing and releasing means (b) via the first compressing and releasing means (a) and additional pipe (B) . After this stage the first compressing and releasing means are filled with mineral oil and are ready for operation.

It is well understood that in the sixth, the seventh and the eighth variations the other required parts are the same as in variations 1 - 5, e.g. pipes connecting between the different parts, actuating means being connected to the tap, etc. Moreover, the sixth and the eighth have also injunction(s) as required.

The present invention will now be illustrated with reference to the accompanying drawings, without being limited by them. Identical parts appearing in several drawings will be marked by the same numerals. In said drawings :

Fig. 1 shows a front view of the device according to the present invention;

Fig. 2 shows a front view of another embodiment of the device according to the present invention;

Fig. 3 shows a front view of another embodiment of the device according to the present invention;

Figs. 4a, 4b and 4c show side views of another embodiment of the device according to the present invention in three positions;

Figs 5a. and 5b. show schematically cross sections of the first piston of one of the variations;

Fig. 6 shows a front view of another embodiment of the device according to the present invention;

Fig. 7 shows a front view of another embodiment of the device according to the present invention;

Fig. 8 shows a front view of another embodiment of the device according to the present invention;

Fig. 9 shows a front view of another embodiment of the device according to the present invention;

Figs. 10a and 10b show front views in two positions of an alternative for the storage tank;

Fig. 11 shows a front view of another embodiment of the device according to the present invention working with mineral oil;

Fig. 12 shows the entrance and exits in the electrical tap in a device working with air;

Fig. 13 shows the entrances and exits in the electrical tap in a device working with mineral oil;

Fig. 14a, 14b and 14c show the operation of the pin, if pres¬ ent;

Fig. 15 shows a front view of a further embodiment of the device according to the present invention working with mineral oil; and

Fig. 16 shows a front view of an additional embodiment of the device according to the present invention working with mineral oil.

In the device shown in Fig. 1 first piston 1 comprises sliding piece 2 being located within piston vessel 3 above springs 4 .Said piston vessel 3 comprises also two one-way valves 5 and 5'. One-way valve 5' sucks in the air as the result of the action of springs 4. One-way valve 5 is connected via pipe 6 to storage tank 7 which is connected to tap 8. Tank 7 and tap 8 are located within housing 9. Tap 8 is connected to an electric source (not shown) . Tap 8 is connected via pipe 10 to second piston 11, wherein the sliding piece 12 of piston 11 is connected to barrier 13. Barrier 13 is

connected to housing 9 by connecting means 1 . The direction of the flow of the air is indicated by arrows

In the device shown in Fig. 2 element 15, which is placed on the road, consists of piston 1, sliding piece 2 being located within piston vessel 3, the top of sliding piece 2 is outside element 15. The springable means and the two one-way valves are not shown. Piston 1 is connected via a pipe to the storage tank and the hydraulic or pneumatic tap which in turn is connected to the electric source, all the above parts are shown schematically in this Fig. as line 16. The tap is connected via pipe 10 to piston 11. Sliding piece 12 is connected to barrier 13. Barrier 13 is connected to the part of the element located above the road by any suitable connecting means 14.

Device 18 shown in Fig. 3 constitutes of element 15 of Fig. 2 and barrier 13 as one unit, piston 11 being connected to the road via sliding piece 12 and axis 19.

The device shown in Fig 4a is in the closed position piston 1 (the springable means and the two one-way valves are not shown) being connected to piston 11 by line 20 which designates: a pipe connecting piston 1 via the storage tank to the tap which in turn is connected to the electric source, and via an additional pipe to piston 11. Piston 11 is connected to barrier 13 via sliding piece 12 and connecting means 21. Barrier 13 consists of two parts 13' and 13'' which are connected to each other by connecting means 22. Barrier 13''' is connected to piston 11 by sliding piece 12.

Whenever the device is operated by the energy of the passing car by any actuating means sliding piece 12 slides and thus parts 13' and 13'' of the barrier slides approximately half way down as shown in Fig. 4b.

Finally car wheel 17 passes over parts 13' and 13'* ^* of the barrier which slide downwards and push sliding piece 2 of piston 1 downwards and additional pressure and energy are gained as shown in Fig 4c.

In the cross section shown in Fig. 5a car wheel 17 is starting to pass above piston 1. Sliding piece 2 is high up, above springs 4. In vessel 3 the direction of the air flow is indicated by the arrow.

In the cross section shown in Fig. 5b car wheel 17 is standing on sliding piece 2 and pushes it downwards. The direction of the

flow of the air is indicated by an arrow outside pipe 6.

In the device shown in Fig. 6 trapezoid-like unit 23 which is located on the road, consists of two side ribs 24' and 24", connecting rib 25 and base 26. First pistons 1' and 1" comprise sliding pieces 2' and 2", respectively, and they are connected to first one-way valves (not shown) . Piston vessels 3', and 3" are located within pistons 1' and 1" respectively. The springable means are not shown. Ribs 24', and 24" press pistons 1' and 1", respectively, downwards by sliding pieces 2' and 2''. Piston vessels 3' and 3'' are connected to one-way valves 5 and 5 ^(2> , respectively. One way-valves 5 ⁽¹⁾ and 5 ^{< )} are connected via pipes 6' and 6" to storage tank 7. The remainder of the device is not shown as it is identical with that shown in Fig. 1.

In the device shown in Fig. 7 trapezoid-like unit 23 which is located on the road, consists of two side ribs 24' and 24", connecting rib 25 and base 26. In this variation side ribs 24' and 24" constitute the sliding means. Piston vessels 3', and 3" are located within pistons 1' and 1'', respectively and they are connected to one-way valves (not shown). Springable means 4' and 4" are connected to ribs 24' and 24", respectively. Piston vessels 3' and 3" are connected to one-way valves 5 ^ι and 5 ', respective¬ ly. One way-valves 5 ⁽¹⁾ and 5 ^,2) are connected via pipes 6' and 6" to storage tank 7. The remainder of the device is not shown as it is identical with that shown in Fig. 1.

In the device shown in Fig. 8 trapezoid-like unit 23 which is located on the road, consists of two side ribs 24' and 24", connecting rib 25 and base 26. In this variation inflatable pillows 27 and 27' constitute the first compressing and releasing means. Said inflatable pillows 27 and 27' are located under the two sides ribs 24' and 24'' respectively, and they are connected to one-way valves (not shown). Moreover inflatable pillows 27 and 27' are connected to one-way valves 5 ^αι and 5 ^(2> , respectively. One way- valves 5 ^U) and 5 ^I2) are connected via pipes 6' and 6" to storage tank 7. The remainder of the device is not shown as it is identical with that shown in Fig. 1.

In the device shown in Fig. 9 trapezoid-like unit 23 which is located on the road, consists of two side ribs 24' and 24", connecting rib 25 and base 26. Two plates 28 and 28' which connect connecting rib 25 and base 26 divide trapezoid-like unit 23 into

three parts 23', 23'' and 23''', respectively which results in closed unit 23''. First pistons 1' and 1" comprise sliding pieces 2' and 2", respectively, and they are connected to first one-way valves 5' ^,ι; and 5 ^{, (2)} which are connected via pipes 29 and 29' respectively to closed unit 23''. Piston vessels 3', and 3" are located within pistons 1' and 1'', respectively. The springable means are not shown. Ribs 24', and 24" press pistons 1' and 1", respectively, downwards by sliding parts 2' and 2''. Piston vessels 3 i.e 3' and 3'' are connected to one-way valves 5 ^{1) and 5 ¹²¹ , respectively. One way-valves 5 ^UI and 5 ⁽²⁾ are connected via pipes 6' and 6" to storage tank 7. Storage tank 7 is connected to tap 8 (not shown) which is connected via pipe 10 to second piston 11, wherein the sliding piece 12 of piston 11 is connected to barrier 13. Moreover, piston 11 has a valve 30 for releasing the closed air inside it while lifting barrier 13.

It is well understood that in this possibility storage tank 7, tap 8 and piston 11 are located inside closed unit 23'', whereas the other parts are located out of said unit. As a result that most of barrier 13 is located out of unit 23'' and only a small part of same is located inside, said unit 23'' is not totally sealed from the environment but decrease the undesired side effects which are caused from the outside such as weather influences; dirt; etc

Figs. 10a and 10b show flexible pipe 6* which replaces pipes 6 and/or 6' and/or 6''. When a regular pressure is maintained in the device (Fig. 10a) the pipe has the same diameter along is length and the pressure inside it is Pl. When a car passes on the device and increases the pressure in the device (Fig. 10b) , the pipe changes its diameter in a part of its length, and in said part the pressure is P2. It is well understood that P2 is higher than Pl. Pipe 6* is flexible and thus when the tap is actuated the high pressure in pipe 6* causes the air to flow to the second piston (piston 11) which is lifting barrier 13.

In the device shown in Fig. 11 trapezoid-like unit 23 which is located on the road, consists of two side ribs 24' and 24", connecting rib 25 and base 26. Pistons 1' and 1" comprise sliding pieces 2' and 2", respectively. Piston vessels 3', and 3" are located within pistons 1' and 1'', respectively. Springs 4' and 4'' are located below slidable means 2' and 2''. Piston vessels 3' and 3'' are connected to first one-way valves 5' ¹¹¹ and 5' ⁽²⁾ which are

connected via pipe 31 to mineral oil basin 32. Piston vessels 3' and 3'' are also connected via second one-way valves 5 ⁽ⁿ and 5 ¹²¹ , respectively and pipes 6' and 6'' to pressure storage container 7'. Said pressure storage container 7' is connected via pipe 10' to tap 8' which directs the steam of the mineral oil to the required direction. The mineral oil flows to piston 11 which is connected via slidable means 12 to barrier 13, which is lifted by the mineral oil pressure. When barrier 13 returns to its basic position tap 8' changes its direction and thus causes the mineral oil, by the energy gained by the pressing element to flow from pressure storage container 7' to the upper part of piston 11. The mineral oil being present at the lower side of piston 11 flows via tap 8' and pipe 33 to mineral oil basin 32.

In Fig. 11 in container 7' can be seen spring 7a and diaphragm 7b.

In Fig.12 can be seen tap 8 with entrance pipe 10 ^π) from the storage tank (not shown) and exit pipe IO ¹²¹ to the second piston (not shown) . Additional exit 34 is present in the closed position, wherein there is no flow of air.

In Fig.13 can be seen tap 8' with entrance pipe 10' ^π* from the storage container (not shown) and two pipes 10' ⁽²⁾ to second piston 11. Pipes 10' ^{2 )} operate as two-way direction pipes. Additional exit 33 extends towards the mineral oil basin (not shown) .

The arrows in Figs 12 and 13 indicate the flow of the air or of the mineral oil.

In Figs. 14a, 14b and 14c can be seen in a schematical manner the device according to the present invention marked 35 not comprising barrier 13. Said device 35 is connected to barrier 13 which in turn is connected to pin 36.

In Fig. 14a the positions of each of elements 13, 35 and 36 are shown. The arrow indicates the movement of barrier 13.

In Fig. 14b. barrier 13 is in the closed position. In this embodiment barrier 13 is in the horizontal position and pin 36 is in its open position. Pin 36 is operated by magnetic coil 36'.

In Fig. 14c. barrier 13 is in the open position. In this embodiment barrier 13 is in the vertical position and pin 36 is in its closed position. Pin 36 is operated by magnetic coil 36''.

In the device shown in Fig. 15 trapezoid-like unit 23 which is located on the road, consists of two side ribs 24' and 24",

connecting rib 25 and base 26. Pistons 1' and 1" comprise sliding pieces 2' and 2", respectively. Piston vessels 3', and 3" are located within pistons 1' and 1'', respectively. Springs 4' and 4'' are located below slidable means 2' and 2'', respectively. Piston vessels 3' and 3'' are connected via pipes 6' and 6'', respective¬ ly, and second one-way valve 37 to pressure storage container 7'. Said pressure storage container 7' is connected via pipe 10' to tap 8' which directs the steam of the mineral oil to the required direction. The mineral oil may flow from pressure storage container 7' to piston 11 which is connected via slidable means 12 to barrier 13, which is lifted by the mineral oil pressure. The oil on the other side of piston 11 flows via pipe 33 and first one-way valve 38 back to piston vessels 3' and 3''.

In the device shown in Fig. 16 trapezoid-like unit 23 which is located on the road, consists of two side ribs 24' and 24", connecting rib 25 and base 26. Pistons 1' and 1" comprise sliding pieces 2' and 2", respectively. Piston vessels 3', and 3" are located within pistons 1' and 1'', respectively. Springs 4' and 4'' are located below slidable means 2' and 2''. Piston vessels 3' and 3'' are connected to first one-way valves 5' ¹ and 5' ² and second one-way valves 5 ^l and 5 ² which in return are connected via pipes 6' and 6'', respectively, and second one-way valve 37 to pressure storage container 7'.The first pistons 1' and 1'' are connected between themselves by pipe 39, via one-way valves 5' ¹ and 5' ² , respectively. Said pressure storage container 7' is connected via pipe 10' to tap 8' which directs the steam of the mineral oil to the required direction. The mineral oil flows from pressure storage container 7' to piston 11 which is connected via slidable means 12 to barrier 13, which is lifted by the mineral oil pressure. The oil on the other side of piston 11 flows via tap 13, pipe 33 and first one way-valve 38 to piston vessels 3' and 3'' i.e. to piston vessel 3'' in a direct manner and to piston vessel 3' via piston vessel 3 ' ' and pipe 39.