DE2140702A1 - Device for the rapid supply of a pressurized fluid medium, in particular a combustion-powered gas supply device - Google Patents

Description

Belleville, New Jersey 07012 / V.St.A.

Our reference: K 957

Device for the rapid supply of a pressurized fluid medium, in particular fuel-operated gas supply

dining equipment.

The invention relates to a vehicle safety device and in particular to apparatus for protecting a vehicle occupant during a collision Inflating a sack to hold the occupant in place and to cushion the impact of the occupant.

Recently, security systems and devices for protecting the occupants of passenger vehicles, in particular Motor vehicles, great attention. One system to which great importance is attached is an inflatable one or an inflatable sack or wrapper that is stored in a collapsed state is used generally in front of the occupant, for example under the dashboard of a motor vehicle. If the vehicle is extraordinary is stopped or braked quickly, such that the occupant is thrown forward, for example against the dashboard or against the windshield, gag stored under pressure is automatically released.

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ben and the sack inflates to hold the occupant in place and dampen.

Such a system must work very quickly. The bag must be within Ililliseku. after a sudden Impact inflated when the Fahrzcug occupants should be protected v / ground. With the system that has been proposed so far Before, electrically ignited explosive charges were used to release the stored gas very quickly. The explosive charge or internal combustion charge is connected to an electrical circuit that causes inertia responsive electrical switch on v / eist, which closes this switch according to a predetermined deceleration rate. Using such a system based on an explosive charge has the disadvantage that it is significant Noise generated when the charge is ignited.

In the previously known systems, the explosive charge is used either to burst the gas container or to tear open a seal at the outlet of the container. In any case, unwanted sound wave propagation occurs in Direction towards the vehicle occupants in the vehicle and an internal combustion charger of considerable strength is required.

The invention provides a device for supplying a pressurized gas for inflating a safety bag in a vehicle, in which the gas is supplied by means of a valve operated with an internal combustion charge, the propagation of the explosion noise to the vehicle occupant being suppressed. In the device according to the invention, an explosive charge of minimal size is required.

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According to the invention, the slide or valve mechanism is which closes the container, pressure balanced, so that a low pressure bias the valve in the closed Holds position. A small internal combustion charge is provided in order to overcome this pressure bias and around to open the valve. The explosive charge is arranged with respect to the rest of the device in such a way that a transmission of sound waves to the vehicle occupant is reduced to a minimum.

The invention will in the following description making reference -g would take, will be explained on the drawing which represents one embodiment of the invention in section.

The device for supplying pressurized gas v / eist a container 10 which contains the gas and further a fuel operated valve 11, within this container.

The container is generally cylindrical and has a neck portion 12 at one end defining an outlet opening 14 and a second neck portion 15 at the other end. The neck portion 15 has an external thread and has a smaller inner diameter than% of neck portion 12. A tubular extension 16 is bolted to the HaIsabschnitt 15 and has an inner diameter which is greater than the this neck portion.

The valve 11 has a piston 19 slidably disposed in the outlet 14 of the quay section 12, a piston 20, which is slidably disposed within the neck portion 15 and further this valve arrangement comprises the Pipe socket 16 and a piston rod 21, which rigidly the piston 19 and 20 connects to each other.

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An O-ring 22 is provided on the piston 19 to seal the outlet 14 and a snap ring 2 4 is within a The groove is located in the mouth of the outlet and keeps the valve closed against the pressure of the gas within the Container.

The piston 20 has an inner portion 25 and an O-ring 26 seals the piston against the inner portion of the Neck section 15 from. The piston 20 also has an outer section 27 which has a larger diameter and this carries an O-ring 29 for sealing purposes. The section 27 has an annular piston surface 30 and carries an electrically ignitable explosive charge 31 which is screwed into an axial bore of the piston. A cross channel 32 connects the inner end of the cartridge 31 to the piston surface 30th

The tubing 16 has a flange 34 which extends radially outwardly for the assembly to be grounded and a flange 35 is also provided which extends radially inward to permit movement of the valve member 11 limit.

The piston section 25 has a smaller diameter than the piston section 19 so that the pressure within the container the valve 11 biases against the snap ring 24 and holds the container in its locked state. Around to open the valve and to release the gas from the neck 12 into the sack, only the differential pressure has to be applied earth between pistons 19 and 25.

For use in the protective device of a vehicle, the container 10 is mounted in front of an occupant, the Pipe socket 16 points in the direction of travel of the vehicle and is furthest away from the occupant. A not shown

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The inflatable sack is attached to the section 12 and is inflated towards the vehicle occupant when inflated * puffs. The cartridge 31 is electrically connected to an inertial sensor.

If a dangerous speed change occurs in the vehicle, the inertia sensor connects the cartridge 31 to it an electrical voltage source. The cartridge is ignited and creates a high pressure gas which passes through the channel 32 flows through and acts on the piston surface 30 and the valve 11 drives to the left. The piston 19 * moves out of the outlet 14 and the container 10 can release its gas into the sack to inflate it.

Since the explosive cartridge 31 only overcome the differential pressure Must that acts on the piston 19, a very small explosive charge is sufficient to the device press .. The arrangement of the explosive cartridge at the furthest point from the occupant affects the spread of sound waves towards the occupant.

By the invention there is provided apparatus comprising an actuated valve and with internal combustion with a λ gas under pressure is fed, said device generates a minimum sound level in operation.

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Claims (9)

2U0702 Claims orrich exercise for quick feeding of a pressurized one standing fluid medi uras with a container in which the fluid medium is contained under pressure and which has an outlet opening have and with a valve, which a having a first piston which seals the outlet opening and a second piston which is connected to the first piston is, wherein both pistons are acted upon by the pressurized medium, characterized in that the first piston (19) has a larger effective surface area than the second piston (20) to allow the valve (11) to bias by pressure towards the outlet (14) that means (24) are provided for the movement of the valve (11) to limit the outlet and that devices are provided which have an internal combustion charge (31), to overcome the pressure bias, to open the outlet (14) and to remove the fluid medium from the container (10) to submit. 2. Apparatus according to claim 1, characterized in that both pistons (19, 20) have surfaces which are in the container (10) and which are acted upon by the pressure of the fluid medium. 3 ·. Device according to claim 1 or 2, characterized in that that the container (10) has a second opening in which the second piston is arranged to seal it. 4. Device according to one of claims 1 to 3, characterized in that that the second piston (20) has a first piston section (25) on which the fluid medium in the container acts, and a second piston portion (27) which is connected to the first Kolbenabsclmitt that the 209814/0854 explosive charge (31) is arranged such that this
acts on the second piston section and moves the valve member in such a direction that the first piston (19) is moved out of the outlet opening (14) towards the interior of the container. 5. Apparatus according to claim 4, characterized in that the explosive charge (31) is carried by the second piston (20) and that the second piston has channels (32), extending from the load to the second piston section. ^ 6. Device according to / uis Claim 4 or 5, characterized in that that on the container (10) devices (35) are provided against which the second piston rests in order to limit its movement stroke when the internal combustion charge is actuated. 7. Device according to one of claims 4 to 6, characterized in that that the container 10 with an internally stepped tubular extension (IG) on the second Opening is provided that this extension has a first inner diameter in which the first piston section of the second piston is arranged and that a second, larger inner diameter is provided, the second piston is disposed in ä which the second piston portion (27). 8. Device according to one of claims 3 to 7, characterized in that that the first and the second opening are aligned with one another. 9. Device according to one of the preceding claims, characterized characterized in that the first and second pistons (19, 20) are formed by a substantially rectilinear component (21); together are connected. 2098U / 0854 Blank page