Description:1. Title of the Invention
Charging device for fighter aircraft launcher

2. Field of the Invention
This invention in general relates to pneumatic system of fighter aircraft and in particular relates to pneumatic charging of pneumatic cylinders of aircraft launcher.

3. Background of the Invention
This item in general is related to aviation industry pneumatic system. More particularly, this item is used for charging nitrogen in pneumatic cylinders of fighter aircraft launcher.

4. Brief Summary of the Invention
Refer block diagram in Figure 1 showing connection of Charging device. Nitrogen supply from source is connected to Charging device (a) input. Charging device output is connected to Charging valve (b) which is mounted on the pneumatic cylinder (c) in aircraft launcher.
Refer Figure 2. Charging device is used for charging of nitrogen in the pneumatic cylinders of aircraft launcher. Hose from nitrogen source trolley is connected to the Charging device using adapter. The device is installed on the charging valve of launcher. With the clockwise rotation of handle of the device, charging valve on launcher is opened and nitrogen is supplied to the cylinder. Cock (2) is provided in the Charging device to adjust the pressure in the cylinder instead of adjusting the pressure from nitrogen source trolley. Also after charging is complete, residual nitrogen in the system is released easily using Cock (2).

5. Detail description of the drawings

The invention can be better understood by reading the detail description followed by the accompanied drawings :
Figure 1: Block diagram of connection of Charging device with aircraft
Figure 2: Sectional view of Charging device showing internal details and connections of different components
Figure 3: shows movement of Shaft (1) with rotation of Handle (4)
Figure 4: Shows operation of Cock (2)
Figure 5: Shows typical assembly of Nut (8) on Main body (3)
Figure 6: Shows Locking semi ring (7)

Reference Numerals Names
1. Shaft
2. Cock
3. Main body
4. Handle
5. Split bush
6. Bush
7. Locking semi ring
8. Nut
9. Adapter
10. Sealing ring
11. Bush
12. Copper seal
13. Copper washer
14. Rubber seal
15. Steel ball
16. Grub screw
17. Screw
18. Key
19. Hose (for reference)
20. Charging valve (for reference

6. Detailed Description of the Invention
Refer sectional view of Charging device in Figure 2. Nitrogen supply from source is connected to Charging device input. Charging device output is connected to Charging valve which is mounted on the pneumatic cylinder in aircraft launcher.

Charging device consists of Handle (4), Cock (2), Main body (3), Shaft (1), Nut (8), Locking semi ring (7), Adapter(9), Rubber seal (14), Copper seal(12). Nitrogen supply from source is connected to Charging device through Adapter (9). Nut (8) is connected with Charging valve on aircraft launcher for charging of nitrogen.
Handle (4) is assembled on Main body (3) through threaded connection. Shaft (1) is assembled in Main body (3) and Handle(4) along with Split bush(5), Bush(6) and Cock (2). Key(18) assembled in shaft (1) fits in the slot provided on Main body, thus allowing for linear movement of Shaft with the rotation of Handle. Semi locking ring (7) as shown in Figure 6 is assembled inside the Handle using screws (17). Semi locking ring prevents movement of Handle out of Main body. Adapter (9) is assembled on Main body using threaded connection. Rubber seal (14) and Copper washer (13) make the joint between Adapter (9) and Main body leak proof. Nut(8) is assembled on Main body using steel balls (15). Grub screw (16) is provided to prevent loosening of steel balls and make firm connection between Main body and Nut as shown in Figure 5 (Section B-B from Figure2). Copper Seal (12) along with Bush (11) in Nut(8) is provided to ensure leak proof connection between Charging device and Charging valve on launcher.

During charging of nitrogen, Hose (19) from Nitrogen charging trolley (Nitrogen source) is connected to the Adapter(9).Nut (8) is installed on the charging valve (20) mounted on the cylinder of launcher. Hose(19) and charging valve (20) are shown in the drawing for reference.
For charging of nitrogen, Handle (4) is rotated in clockwise direction and shaft (1) moves in downward direction and opens charging valve (mounted on cylinder of launcher), thus opening the passage way from Adapter to cylinder to be charged. Figure 3(a) shows position of shaft (1) before rotation of Handle (4) and Figure 3(b) shows position of shaft (1) after rotation of Handle (4).

After charging is completed, Handle (4) is rotated in counter clockwise direction and shaft (1)moves in upward direction and charging valve gets closed, thus closing the passage way from Adapter(9) to cylinder. Nitrogen supply from source is closed. During charging process, steel ball is pressed against passage way in shaft (1) preventing release of nitrogen to atmosphere as shown in Figure 4(a). After completion of charging, knob of Cock (2) is rotated in counter clockwise direction, with this, steel ball is lifted from the edge of air passage on shaft as shown in Figure 4(b) and residual nitrogen from the device is released. After completion of charging, hose connection is removed from Adapter (9) and Nut (8) is removed from charging valve of launcher.
, Claims:We claim:
1. A Nitrogen Charging device for charging nitrogen in pneumatic cylinders of launcher of fighter aircraft comprising:
a Main body (3);
a Handle(4), assembled on said Main body (3) through threaded connection;
a Shaft (1), assembled in said Main body (3) and said Handle (4) along with a Split bush (5), a Bush
(6) and a Cock (2); and
an Adapter (9) assembled on said Main body (3) using threaded connection.

2. The Nitrogen Charging device as claimed in Claim 1, wherein Locking semi ring (7), assembled inside said Handle (4) restricts movement of said Handle (4) out of said Main body (3).

3. The Nitrogen Charging device as claimed in Claim 1, wherein said Handle (4) rotates in clockwise direction and said shaft (1) moves in downward direction and opens charging valve and the passage way from Adapter to cylinder to be charged.

4. The Nitrogen Charging device as claimed in Claim 1, wherein Nut (8) is assembled on said Main body (3) using a steel ball (15) in plural anda Grub screw (16) is provided to prevent loosening of said steel ball (15)to make firm connection between said Main body (3) and said Nut (8).