Brakes – Operators – Automatic
Patent
1985-09-10
1987-10-27
Reger, Duane A.
Brakes
Operators
Automatic
2421074B, 297216, F16F 900
Patent
active
047023538
ABSTRACT:
Disclosed is a system for limiting the acceleration applied to a body which is to be protected from damage. In one arrangement, the limiting device is mounted on a helicopter seat which is vertically slidable so as to permit limited downward movement of the seat relative to its supporting structure in a crash situation. The limiting device having strap mounted on a reel is mounted to the seat, with one end of the strap being connected to a support. A capstan spring wound on the reel prevents rotation of the reel and unwinding of the strap until a predetermined acceleration is reached, as sensed by an inertia element within the reel. The sensor applies an unwinding force to the capstan spring sufficient to permit braked rotary movement of the reel. In this fashion, the acceleration applied to the seat occupant's body is limited to a safe level. In another situation, a capstan spring brake is employed to limit the acceleration applied to a load suspended by cables in a vehicle or other structure to prevent damage to the contents of the package. The example illustrated protects an electronic communication package in a vehicle to limit the affect of shock waves from nearby explosions.
REFERENCES:
patent: 3089564 (1963-05-01), Smittle
Pacific Scientific Company
Reger Duane A.
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