Apparel – Guard or protector – For wearer's head
Patent
1989-07-10
1990-09-04
Hannon, Thomas R.
Apparel
Guard or protector
For wearer's head
2 25, 428113, 428286, 428911, B32B 500
Patent
active
049532340
ABSTRACT:
The present invention is an impact resistant composite and helmet made thereof. The helmet comprises an impact resistant composite shell. The composite shell comprises a plurality of prepreg packets. Each prepreg packet comprises at least about 2 and preferably 5 to 20 prepreg layers. There are from 2 to 50 and preferably 5 to 20 prepreg packets. Each prepreg layer comprises a plurality of unidirectional coplanar fibers embedded in a polymeric matrix. The fibers of adjacent layers in the prepreg packets are at an angle of from 45.degree. to 90.degree., preferably 60.degree. to 90.degree., more preferably 80.degree. to 90.degree. and most preferabaly about 90.degree. from each other. The angle of the fiber in alternate layers is preferably, sustantially the same.
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Li H. L.
Prevorsek D. C.
Allied-Signal Inc.
Hannon Thomas R.
Henry Patrick L.
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