Blast wave choke

Details Blast wave choke Blast wave choke

1986-11-03

1988-06-21

Joyce, Harold

98 391, 98119, F24F 1100

Patent

active

047518740

ABSTRACT:
A blast wave choke to be disposed at the above ground entrances of a ventilation system for a underground personnel shelter wherein a plurality of annular choke elements of progressively smaller inside diameter are aligned along a common axis and spaced one from the other by annular interposed spacer elements wherein each spacer element has an inside diameter that is greater than the adjacent choke elements wherein a blast wave entering the ventilation system will encounter a series of rings and set up an interference pattern which will dissipate the energy of the blast wave before it can enter the underground shelter and cause injury to persons or damage to property therein.

REFERENCES:
patent: 2347895 (1944-05-01), Evans
patent: 3093056 (1963-06-01), Rosenfeld
patent: 3132666 (1964-05-01), Nelson
patent: 3523483 (1970-08-01), Serbin

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