Land vehicles – Wheeled – Attachment
Reexamination Certificate
2000-05-11
2001-05-29
Rice, Kenneth R. (Department: 2167)
Land vehicles
Wheeled
Attachment
C280S741000
Reexamination Certificate
active
06237951
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention refers to a device permitting the flow of pressurized gas into a safety device, for example an air bag or a belt tightener according to the pressurized container for compressible gas with at least one opening that is sealed with a gas-tight film covering, wherein the film covering is supported evenly, over at least a large part of its surface, by a support device that can be destroyed or retracted in a targeted manner after triggering
Such devices according to the state of the art have a pressurized container for compressible gas with at least one opening, that is sealed with a gas-tight film covering, where the film covering is supported evenly, over at least a large part of its free surface, by a support device that can be destroyed or retracted in a targeted manner after triggering. Such a mechanism is already known from DE 195 40 618 A, in which the gas-tight film seal is opened as soon as the support device was removed after triggering of the device.
To ensure that the gas-tight film covering opens systematically after removal of the support device, for example, the piercing of the film forcibly in one location by means of a sharp edge provided on the support device, mounted so as to slide, is described in WO 96 41 732.
When using a destructible or retractable or collapsible support device, it is difficult to provide for the piercing of the sealing foil in connection with the movement of the support device in a reproducible fashion.
SUMMARY OF THE INVENTION
The object of the invention is therefore to develop the generic device cited at the beginning in such manner that after triggering the device permitting pressurized gas to flow, it is ensured that the gas-tight film closing the pressurized container is forcibly opened.
According to the invention, this task is solved starting from a device according to the device letting pressurized gas stream into a safety device, for example an airbag or a belt tightener, with a pressurized container for compressible gas with at least one opening that is sealed with a gas-tight film covering, wherein the film covering is supported evenly, over at least a large part of its surface, by a support device that can be destroyed or retracted in a targeted manner after triggering by means of a piece that pierces or penetrates the film immediately after the triggering of the device but before the time at which the support device moves. According to this, the device has a piece that pierces the film immediately after the triggering of the device but before the support device has moved. This also ensures that the gas-tight film is forcibly opened in the event that a support device that collapses after triggering is used.
The subclaims dependent on the particularly suitable embodiments of the invention are presented herein.
Advantageously, the device has a pyrotechnic propellant that is ignited after triggering. Here it is particularly advantageous if the pyrotechnic propellant causes the piercing of the gas-tight film after ignition and then moves away from the support device.
The support device advantageously has an opening underneath the supported gas-tight film, the opening being about 20% of the surface area of the whole gas-tight film.
A nail can be driven through this opening by means of the expanding combustion gas from the pyrotechnic propellant, in order to forcibly pierce the film. Here, the nail can advantageously be mounted on the support device such that it pivots.
As an alternative, however, the film can be burned by the expanding combustion gas from the pyrotechnic propellant that penetrates through the opening in the support device directly to the gas-tight film.
According to one advantageous embodiment of the invention, the support device is created such that it collapses after ignition of the pyrotechnic propellant.
Further details and advantages of the invention are explained in greater detail based on the methods of embodiment. They show:
REFERENCES:
patent: 4203616 (1980-05-01), Okada
patent: 4275901 (1981-06-01), Okada
patent: 4289327 (1981-09-01), Okada
patent: 5611567 (1997-03-01), Hoo
patent: 5678856 (1997-10-01), Headley
patent: 5803494 (1998-09-01), Headley
patent: 5826904 (1998-10-01), Ellis et al.
patent: 2224617 (1973-03-01), None
patent: 19540619 (1997-05-01), None
patent: 19540618 (1997-05-01), None
patent: 96/41732 (1996-12-01), None
Bohman Mats
Qvint Peter
Autoflator AB
Dilworth & Barrese LLP.
Rice Kenneth R.
LandOfFree
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