Impact resistant helmet

Details Impact resistant helmet Impact resistant helmet

1990-07-31

1992-05-12

Thomas, Alexander S.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including grain, strips, or filamentary elements in...

428174, 428212, 428911, 428105, B32B 508

Patent

active

051126672

ABSTRACT:
The present invention is an improved 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 jacket 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 preferably about 90.degree. from each other. The angle of the fiber in alternate layers is preferably, subtantially the same.

REFERENCES:
patent: 4953234 (1990-09-01), Li et al.

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