Pressure vent for air bag cushion
First Claim
1. In an air bag cushion having a flexible fabric enclosure and at least one vent opening extending through said enclosure to expel gas inflating said cushion, the improvement comprising:
- a frangible covering selectively restricting flow of said gas from said cushion, said covering including a main body covering said vent opening and having a peripheral edge portion overlying said enclosure, said edge portion being frangibly secured to said confine to secure said main body to said confine while said cushion is inflated to a predetermined pressure to thus restrict flow of said gas through said vent opening, and to fail above said predetermined pressure to permit gas to be expelled from said vent opening, said covering further including a tab extending from said main body, said tab being permanently secured to said enclosure to retain said covering to said cushion after failure.
2 Assignments
0 Petitions
Accused Products
Abstract
An air bag cushion having improved frangible vent coverings. The cushion includes one or more vent openings which will permit the inflation gas to exit the cushion and provide the proper pressure reduction for preventing injury to the passenger. Each of the vent openings includes a frangible covering associated therewith. The coverings include a main body have a peripheral shape and size to extend beyond the edge of the vent opening. the main body overlies and completely covers the vent opening. The periphery of the covering is frangibly secured to the cushion, such as by a tear seam. The covering also includes a tab extending outward from the main body, and also overlying the cushion. The tab is permanently secured to the cushion, such as by a permanent seam. The tear seam is designed to release when the pressure in the cushion, acting upon the portion of the covering overlying the vent, exceeds a predetermined pressure which is known to be associated with compression of the cushion by the passenger. When the tear seam fails, the vent is uncovered, and the desired venting occurs. The covering, however is retained to the cushion by the tab and permanent seam.
130 Citations
20 Claims
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1. In an air bag cushion having a flexible fabric enclosure and at least one vent opening extending through said enclosure to expel gas inflating said cushion, the improvement comprising:
a frangible covering selectively restricting flow of said gas from said cushion, said covering including a main body covering said vent opening and having a peripheral edge portion overlying said enclosure, said edge portion being frangibly secured to said confine to secure said main body to said confine while said cushion is inflated to a predetermined pressure to thus restrict flow of said gas through said vent opening, and to fail above said predetermined pressure to permit gas to be expelled from said vent opening, said covering further including a tab extending from said main body, said tab being permanently secured to said enclosure to retain said covering to said cushion after failure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An adaptive air bag passive restraint system, comprising:
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an inflator constructed and arranged to selectively produce a partial amount of gas or a full amount of gas depending upon the sensed factors during a collision; a cushion operatively associated with said inflator to receive said gas, said cushion having a flexible fabric enclosure and at least one vent opening extending through said enclosure to expel said gas inflating said cushion, said cushion, when said full amount of gas is received therein, being inflated to a first pressure; and a frangible covering selectively restricting flow of said gas from said cushion, said covering including a main body covering said vent opening and having a peripheral edge portion overlying said enclosure, said edge portion being frangibly secured to said confine to secure said main body to said confine while said cushion is inflated to said first pressure to thus restrict flow of said gas through said vent opening, and to fail above said first pressure to permit gas to be expelled from said vent opening, said covering further including a tab extending from said main body, said tab being permanently secured to said enclosure to retain said covering to said cushion after failure. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification