Aeronautics and astronautics – Aircraft structure – Fuselage and body construction
Patent
1976-10-20
1979-04-24
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft structure
Fuselage and body construction
297216, B64D 2504
Patent
active
041508050
ABSTRACT:
A tri-axis crash survivable seat, utilizing a plurality of energy absorbers, which are swivel mounted to the seat bucket and also to a frame where the frame is securely fastened to the structure of a rotary wing or fixed wing aircraft. The energy absorbers are utilized in upper, intermediate and lower pairs, each having different energy absorbing characteristics, stroking distances, and force-displacement relationships from the other pairs. The energy absorbing devices attach to the bucketseat and supporting frame so as to permit tri-axial energy absorption during impact for various vertical or combined vertical impact angles. Each of the intermediate pair of energy absorbing devices is a two stage device designed to minimize the dynamic overshoot associated with the elasticity of the human body, such that a reduced probability of injury is obtained. Energy is dissipated in a controlled manner through the process of the displacement of the seat relative to the craft under arbitrary crash conditions.
REFERENCES:
patent: 2471166 (1949-05-01), Neff
patent: 2971566 (1961-02-01), Negroni
patent: 3369634 (1968-02-01), Mazelsky
patent: 3603433 (1971-09-01), Keathley et al.
patent: 3635314 (1972-01-01), Mazelsky
patent: 3788148 (1974-01-01), Connell et al.
patent: 3922034 (1975-11-01), Eggert
Mason Reilly, "Crashworthy Troop Seat Investigation" USAAMRDL-TR-74-93, Dec. 1974, pp. 53-88, 124-166.
ARA, Inc.
Barefoot Galen L.
Herzig Albert M.
Walsh Edward C.
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