Stretchable belt and process for the production thereof
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United States of America Patent
Stats
-
May 5, 1987
Grant Date -
N/A
app pub date -
May 24, 1985
filing date -
Jun 7, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A stretchable belt, such as for safety belt restraint systems in vehicles, includes a base material and at least one additional material having a different stress-stretch curve. By providing a base material with higher deformability than the additional material the stress-stretch curve of the belt has a first steeply rising portion where the load is primarily transmitted to the additional material. At a given load point, the additional material abruptly tears, and the load is transmitted to the base material. Thereafter, the stress versus stretch curve continues at a substantially lower angle. In this manner, the belt absorbs a maximum amount of energy for a given maximum load and maximum stretch. The belt may be formed from a single type of raw material, mechanically or thermally treating it to provide different stress versus stretch characteristics for the base material and the additional material.
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