FIELD OF THE INVENTION
The present invention relates to a device used for self leveling of air springs. More particularly, the present invention relates to a pneumatic regulator device in which the supply air tube is passed through inside of the pneumatic air regulator body.

BACKGROUND OF THE INVENTION
For many industrial and home applications compressed air is widely used for manufacturing facilities so that it can be often considered as the fourth utility after electricity, natural gas and water. Electric motion is considered to have excellent energy efficiency even though it is difficult to overcome the simplicity and reliability of pneumatics. Also the lower maintenance cost makes the pneumatics popular and economical choice for implementing mechanical motion. Pressure air regulators are pneumatic devices used in many industries and common home applications like home heating furnaces to regulate natural gases, in medical and dental equipment to regulate oxygen and anesthesia gases, in pneumatic automation systems to regulate compressed air etc. These pressure regulators are used to maintain constant output pressure with respect to variations in the input pressure. Self leveling pneumatic air regulator controls air supply as the load of equipment varies during operation and keeps the system leveled against gravity and maintains high precision.
Safety of operators is one of the prime concerns for machine builders. Protection of machine from various damages and complying with regulations is also necessary. Design is an important aspect for machine safety and should be considered during all phases of development including testing, operation and maintenance. In recent years, more research is going on to improve the design aspect of pneumatics to make it a good option for machinery of automated industry. To prevent the supply rubber tubes from damage and to increase the life of the device there is need of some type of arrangement which require less maintenance.
US5669597A discloses a self-pumping air suspension spring for a motor vehicle, comprising roller bellows which form a spring chamber, a spring carrier which includes a cylinder and a piston rod (in which piston rod can be displaced axially in the cylinder, whereby the roller bellows are functionally connected to the cylinder and the piston rod), a vestibule, or pilot chamber, with at least one connection to the spring chamber, and at least one connection to the compressed air reservoir. When there is a movement of the piston rod, a pumping process into the spring chamber takes place, via the vestibule, in connection with at least one non-return-valve. The drawback of this invention is that the supply tube is connected to the cylinder and piston rod outside the chamber which takes more space and has chances of damage. Further it comprises a plastic tube which easily breaks from small amount of deformation.
DE102011114570B4 discloses an air spring arrangement or an air spring damper with integrated valve controller for controlling the level position of a vehicle or a driver’s cabin, said air spring assembly and the air spring dampers include a roll tube and a cover and an air spring bellows, which delimits together with the roll tube and the cover, a pressure chamber with compressed air, and a control valve for supplying compressed air into the pressure chamber and discharge of compressed air from the pressure chamber, and a compression spring means, one end of which communicates with the roll-off piston or the cap and the other end acts on the actuating means for the control valve. The drawback of this invention is that the air supply tube is connected outside the chamber which takes more space and has chances of damage.
Therefore, there is a need of an improvement in the design of the pneumatic air regulator to overcome the disadvantages described in the above mentioned stated art and to provide a safe, light weight, compact and reliable device which requires less maintenance and has longer life.

OBJECT OF THE INVENTION
The main object of the present invention is to provide a device for self leveling of air springs.
Another object of the present invention is to provide a pneumatic air regulator that controls air supply and keeps it leveled against gravity and maintains high precision.
Yet another object of the present invention is to provide a pneumatic air regulator in which a supply air tube passes from inside the body of said regulator.
Yet another object of the present invention is to provide a pneumatic air regulator that requires less maintenance, as the supply air tube is not exposed to the open air and is not damaged by tools and tackles during the use of said regulator.
Yet another object of the present invention is to provide a pneumatic air regulator with much less probability of supply airline and connector’s failure or leakages arise due to operational interferences.
Yet another object of the present invention is to provide a pneumatic air regulator that is installed in remote areas with trouble free operations and without maintenance for much longer periods.
Still another object of the present invention is to provide a cost effective regulator which reduces breakdowns and increase the reliability.

SUMMARY OF THE INVENTION
The present invention relates to a device for self leveling of air springs. More particularly, the present invention relates to a self leveling pneumatic air regulator that controls air supply as the load of equipment varies during operation and keeps it leveled against gravity and maintains high precision.
In an embodiment of the present invention, a pneumatic air regulator comprising of a slider or piston pin has three positions i.e. open, closed and neutral. The piston pin is positioned on the top of the regulator. When the pneumatic air regulator is in open position, the slider pin is opened; the air is added in the air spring. In closed position, air is pumped into the closed pneumatic air springs and in central neutral position, air supply to the air spring is cut off. An air spring is always used alongside the self leveling valve. When the air is released, the pressure and air volume in the air spring is reduced. A spring is used to restore original position of the slider pin with each displacement. In order to raise or lower the slider pin system, a knurled nut is used, which in turn raise the lift of air spring and thereby allows precision levelling of air springs.
In another embodiment of the present invention, the supply air tube passes from inside of the body of the self levelling air regulator so that the tube is not interfering with the working of the self levelling air regulator. Since, the supply air tubes are not hanging in open, leakages due to operational interferences are avoided and said regulator is installed in remote areas with trouble free operations and without maintenance for much longer periods. This design makes the air supply line fully covered and is not visible from outside. This keeps the supply tubes safe and hence increases the life. The regulator also increases the reliability while reducing breakdowns and the cost involved.

BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described with reference to the following drawings of which:
Figure 1 shows a cross sectional view of pneumatic air regulator for self leveling of air springs.
Figure 2 shows an exploded view of pneumatic air regulator for self leveling of air springs.

DETAILED DESCRIPTION OF THE INVENTION
The present invention now will be described hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. While the following description details the preferred embodiments of the present invention is not limited in its application to the details of construction and arrangement of the parts illustrated in the accompanying drawings.
In an embodiment of the present invention, a pneumatic air regulator is provided comprising of a slider or piston pin having three positions i.e. open, closed and neutral. The piston pin is positioned on the top of the pneumatic air regulator. Based on the movement of the slider pin, the air regulator is opened, closed or in neutral position. When the slider pin position is opened, the air is added in the air spring. In closed position, the air is pumped into the closed pneumatic air springs and in central neutral position air supply to the air spring is cut off. An air spring is always used alongside the self leveling valve. When the air is released, the pressure and air volume in the air spring is reduced. A spring is used to restore original position of the slider pin with each displacement. In order to raise or lower the slider pin, a knurled nut is used which raises the lift of air spring and thereby allows precision levelling of air springs. In order to allow up and down movement of the slider, heavy compression spring is used.
In another embodiment of the present invention, the supply air tube passes from inside of the body of the self levelling air regulator so that the tube is not interfering with the working of the self levelling air regulator. This design makes the air supply line fully covered and is not visible from outside. The overall device becomes compact and it covers all connectors inside the ducting of the equipment and the regulator body.
Since air tubes are not hanging in open, leakages due to operational interferences are avoided and the device is installed in remote areas with trouble free operations and without maintenance for much longer periods. This helps in installations of precision equipment’s in remote areas with much less probability of supply airline and connector’s failure or leakages arise due to operational interferences. Also, less maintenance is required as the supply air tube is not exposed to the open air and is not damaged by tools and tackles during the use of the equipment. Thus keeps the supply tubes safe and hence increases the life. The device increases the reliability while reducing breakdowns and the cost involved.
In another embodiment of the present invention, a self leveling pneumatic regulator device is provided that is used alongside an air spring for vibration isolation of very high precision equipment’s which takes measurement reading in micrometers, nanometers, micrograms, nanograms, high resolution imaging equipment etc. which needs to be protected from external vibrations and has to be perfectly leveled for any load changes. The self-leveling pneumatic regulator controls air supply as the load of equipment varies during operation and keeps it leveled against gravity and maintains high precision.
Figure 1 depicts the preferred embodiment of the present invention, wherein a pneumatic air regulator 21 comprises of a housing; a slider piston pin i.e. sensor pin 10; a releasing port 11; an inlet port 12; an outlet port 13; a plunger 14; a plurality of spring elements 15, 16, and 17; an adjustable outer ring 18; an outer body 19; and a supply air tube 20. The sensor pin 10 is positioned on the top of the regulator having three positions i.e. open, closed and neutral. The sensor pin 10 is connected to releasing port 11 and through plunger 14 they are associated with the spring elements 15 and 16 for controlling the position of the sensor pin 10 as depicted in Figure 2. Based on the movement of the sensor pin 10 the pneumatic air regulator 21 is opened, closed or in neutral position. When the position of sensor pin 10 in pneumatic air regulator 21 is opened, the air is added in the air spring through the outlet port 13. In closed position, the air is pumped into the closed pneumatic air springs and in central neutral position, air supply to the air spring is cut off. An air spring is always used alongside the self leveling valve. When the air is released, the pressure and air volume in the air spring is reduced. The input air is supplied by the supply air tube 20 which passes from inside of the outer body 19 of the pneumatic air regulator. The supply air tube 20 is passed through another spring element 17 and connected to the inlet port 12 to supply air to the regulator.
Many modifications and other embodiments of the invention set forth herein will readily occur to one skilled in the art to which the invention pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

We claim:
1. A pneumatic air regulator (21) comprises of:

a housing;

a slider piston pin (10);

a plurality of ports (11, 12, 13);

a plunger (14);

a plurality of spring elements (15, 16, 17);

an outer ring (18); an outer body (19); and

a supply air tube (20);

wherein,
the slider piston pin (10) is positioned on the top of said regulator (21) and is connected to the port (11) and with the spring elements (15, 16) through the plunger (14);

the supply air tube (20) passes from inside of the outer body (19) and through the spring element (17) and is connected to the port (12) to supply air to said regulator (21); and

the slider piston pin (10) has three positions namely open, closed and neutral to control the movement of the pneumatic air regulator (21).

2. The air regulator (21) as claimed in claim 1, wherein, the slider piston pin (10) has a knurled nut to raise and lower the said pin and raise said regulator.

3. The air regulator (21) as claimed in claim 1, wherein, the slider piston pin (10) when in open position, air is added to the regulator (21) through the port (13).

4. The air regulator (21) as claimed in claim 1, wherein, the slider piston pin (10) when in closed position, air is pumped into the regulator (21).

5. The air regulator (21) as claimed in claim 1, wherein, the slider piston pin (10) when in neutral position, air supply to the regulator (21) is cut off.

6. The air regulator (21) as claimed in claim 1, wherein, the supply air tube (20) passes from inside of the outer body (19) of said regulator (21) to avoid interference between the supply air tube (20) and the working of the regulator (21).

7. The air regulator (21) as claimed in claim 1, wherein, the slider piston pin (10) is provided with a compression spring to allow its up and down movement.