Chairs and seats – Crash seat – Bottom and back movable as unit in response to force
Patent
1980-12-05
1982-11-09
Zugel, Francis K.
Chairs and seats
Crash seat
Bottom and back movable as unit in response to force
188372, B60R 2110
Patent
active
043581544
ABSTRACT:
A crashworthy helicopter crew seat, which includes a seat bucket connected to a support structure by an adjustable energy attenuator of the wire bending type. The attenuator includes a frame carried by the seat bucket, three parallel, vertically disposed wires connected at opposite ends to the attenuator frame, and a trolley assembly affixed to the support structure containing three sets of three rollers, rotatable about three vertically spaced horizontal axes, about which the three wires are respectfully bent and unbent as the seat bucket strokes downward during a crash of the helicopter. The lower two rollers of two of these sets of three rollers are displaceable along their axes between an engaged position and a disengaged position relative to a wire associated with these rollers. These displaceable rollers are connected to a manually operated attenuator adjustment mechanism having a maximum setting at which all rollers are engaged with their associated wires, an intermediate setting at which only two of the three sets of three rollers are engaged with their associated wires, and a minimum setting at which only one wire is engaged with the set of three rollers which is not connected to the adjustment mechanism. By selecting a maximum, intermediate, and minimum settings of the adjustment mechanism in accordance with the weight of the seat occupant, the maximum stroke distance of the seat is reduced without detrimentally affecting the protection afforded the occupant of the seat against dangerous acceleration forces.
REFERENCES:
patent: 1511264 (1924-10-01), Carter
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patent: 3059966 (1962-10-01), Spielman
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patent: 3603638 (1971-09-01), McGregor
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patent: 3868143 (1973-04-01), Reilly
patent: 3968863 (1976-07-01), Reilly
patent: 4003534 (1977-01-01), Kenigsberg
patent: 4005765 (1977-02-01), Reilly
patent: 4150805 (1976-10-01), Mazelsky
Mason J. Reilly, "Crashworthy Troop Seat Investigation", Dec. 1974, pp. 53-56.
Boeing Vertol Company
Zugel Francis K.
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