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1. WO1996041732 - A GAS SUPPLY

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[ EN ]

CLAIMS :

1. A gas supply, said gas supply comprising a bottle containing compressed gas, at least one opening formed in the wall of the bottle, a metal foil extending across the opening, the periphery of the foil being secured to the bottle, the foil sealing the opening in a gas-tight manner, an element being provided on the exterior of the bottle, located adjacent the aperture, part of the foil being pressed against said element, in the region of the aperture, by the compressed gas within the bottle, means being provided to move said element in response to a predetermined signal in such a way that the movement of the element causes part of the element in engagement with the foil to tear or cut the foil, thus permitting gas to escape from the bottle of compressed gas.

2. A gas supply according to Claim 1 wherein the gas supply is connected to supply gas to a safety device within a motor vehicle.

3. A gas supply according to Claim 2 wherein the gas supply is adapted to supply gas to an air-bag within the motor vehicle.

4. A gas supply according to any one of the preceding Claims wherein the said bottle is a metal bottle and the foil has a thickness of less one-fifth of the thickness of the wall of the bottle.

5. A gas supply according to any one of the preceding Claims wherein the means to move said element comprise a pyrotechnic charge.

6. A gas supply according to Claim 5 wherein an electric igniter is provided adapted to ignite the pyrotechnic charge in response to a predetermined signal.

7. A gas supply according to any one of the preceding Claims wherein the element has a further part, located initially adjacent the part against which the foil is pressed, the said further part being brought into contact with the foil on movement of said element.

8. A gas supply according to Claim 8 wherein the further part comprises a pointed projection.

9. A gas supply according to Claim 8 wherein the further part comprises a projecting knife blade.

10. A gas supply according to any one of Claims 1 to 6 wherein the said part of the element against which the foil is pressed is provided with a recess, part of the foil being pressed into the recess, the arrangement being such that upon movement of the element, the part of the foil within the recess is torn.

11. A gas supply according to any one of Claims 1 to 6 wherein the part of the foil that is initially pressed against part of the element by the compressed gas within the bottle is soldered or adhered to the said part of the element.

12. A gas supply according to any one of the preceding Claims wherein the element comprises a piston movable within a cylindrical recess defined by a re-entrant portion of the bottle, the said aperture being formed in the side wall of the re-entrant portion.

13. A gas supply substantially as herein described with reference to and as shown in Figure 1 of the accompanying drawings.

14. A gas supply substantially as herein described with reference to and as shown in Figure 2 of the accompanying drawings.

15. A gas supply substantially as herein described with reference to and as shown in Figure 3 of the accompanying drawings.

16. A gas supply substantially as herein described with reference to and as shown in Figure 4 of the accompanying drawings.