Airbag
First Claim
1. An airbag as part of an airbag device mountable on vehicle, the airbag developing and inflating with inflation gas from folded and housed state for protecting a target object of protection with cushioning property thereof when contacting with the target object, the airbag comprising:
- a bag-shaped circumferential wall;
an upstream side base cloth as constituent part of the circumferential wall, the upstream side base cloth being located in upstream side of inflation gas;
a downstream side base cloth as constituent part of the circumferential wall, the downstream side base cloth being located in downstream side of inflation gas; and
a lap portion formed by superposing a terminal portion of the downstream side base cloth on a terminal portion of the upstream side base cloth, and by joining the terminal portions to each other at both ends of the terminal portions in a direction extending along edges of the terminal portions, whereby the terminal portion of the upstream side base cloth is masked from surface of the airbag, wherein;
the lap portion comprises a communication port between joined portions of the upstream side base cloth and the downstream side base cloth and between the terminal portions of the upstream side base cloth and the downstream side base cloth, the port communicating inside and outside of the airbag, whereby;
in the course of unfolding and inflation of the airbag, the inflation gas flowing toward the downstream side base cloth from the upstream side base cloth in the lap portion sucks air into the airbag from outside via the communication port; and
when the airbag bumps against a target object of protection halfway of inflation, inflation gas is exhausted out of the airbag via the communication port; and
when the airbag is completely inflated, the communication port is closed with the terminal portions of the upstream side and downstream side base cloths contacted with each other.
1 Assignment
0 Petitions
Accused Products
Abstract
The airbag includes a bag-shaped circumferential wall formed of base cloths, and a lap portion. In the lap portion, a terminal portion of a downstream side base cloth, which is located in downstream of inflation gas, is superposed on a terminal portion of an upstream side base cloth, which is located in upstream of inflation gas. Then the lapping terminal portions are joined to each other at both sides thereof in a direction extending along edges of the terminal portions, thereby providing the lap portion. A communication port communicating inside and outside of the airbag is provided between the joined portions and between the terminal portions of the upstream and the downstream side base cloths. With this construction, in the course of airbag inflation, inflation gas flowing toward the downstream side base cloth from the upstream side base cloth sucks air into the airbag from outside via the communication port, and when the airbag bumps against a target object of protection halfway of inflation, inflation gas is exhausted out of the airbag via the communication port. Moreover, when the airbag is completely inflated, the communication port is closed with the terminal portions contacted with each other. The airbag of the present invention suppresses increase of internal pressure upon engaging a target object of protection halfway of inflation, as well as completing inflation swiftly.
15 Citations
12 Claims
-
1. An airbag as part of an airbag device mountable on vehicle, the airbag developing and inflating with inflation gas from folded and housed state for protecting a target object of protection with cushioning property thereof when contacting with the target object, the airbag comprising:
-
a bag-shaped circumferential wall; an upstream side base cloth as constituent part of the circumferential wall, the upstream side base cloth being located in upstream side of inflation gas; a downstream side base cloth as constituent part of the circumferential wall, the downstream side base cloth being located in downstream side of inflation gas; and a lap portion formed by superposing a terminal portion of the downstream side base cloth on a terminal portion of the upstream side base cloth, and by joining the terminal portions to each other at both ends of the terminal portions in a direction extending along edges of the terminal portions, whereby the terminal portion of the upstream side base cloth is masked from surface of the airbag, wherein; the lap portion comprises a communication port between joined portions of the upstream side base cloth and the downstream side base cloth and between the terminal portions of the upstream side base cloth and the downstream side base cloth, the port communicating inside and outside of the airbag, whereby; in the course of unfolding and inflation of the airbag, the inflation gas flowing toward the downstream side base cloth from the upstream side base cloth in the lap portion sucks air into the airbag from outside via the communication port; and when the airbag bumps against a target object of protection halfway of inflation, inflation gas is exhausted out of the airbag via the communication port; and when the airbag is completely inflated, the communication port is closed with the terminal portions of the upstream side and downstream side base cloths contacted with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification