Patent for License:

Mechanical, Variable Pressure Shock Absorber    

This shock absorber mechanically adjusts its energy absorption as a function of the compression rate at the very beginning of the stoke


Current shock absorbers gradually increase the internal pressure during the stroke to absorb energy. If the compression rate is greater than the yield strength of the shock, the shock fails before it has absorbed a significant part of the energy. This shock, however, will adjust its pressure mechanically as a function of the initial compression rate. Thus, in the case of an airplane, if the landing is a gentle one, the small load is spread evenly over the entire stroke. This makes for an almost imperceptible landing. If the landing is one where the descent rate exceeds the capacity of the shock, the shock will pressurize to its maximum for the entire stroke and absorb as much energy as possible before bottoming out.

Primary Application of the Technology

An improved version has been designed that uses a hydraulic fluid that changes viscosity based on an applied electrical charge. Using a 3-ft stroke, the new gear should absorb up to 2000 fpm impacts with no damage to the aircraft, hull, or vehicle body or occupants. Far exceeding FAA standards for certified aircraft (7-10 fps (600 fpm)), these shocks are applicable to a multiplicity of equipage, vehicles and industry situations.

Patent Summary

U.S. Patent Classes & Classifications Covered in this Patent:

Class 244: Aeronautics And Astronautics

Machines or structures adapted to be: completely or partially sustained by the air (e.g., winged aircraft, helicopters, parachutes, kites, balloons, etc.); propelled and guided or stabilized through the air (e.g., projectiles with fins, guided missiles, etc.); placed in an orbit or which substantially operate outside the earth"s atmosphere (e.g., satellites, space vehicles, etc.); or subcombinations of these machines or structures.

Subclass 100R: LANDING GEAR
Subclass 104FP: Fluid pressure
Subclass 104R: Resiliently mounted

Class 188: Brakes

Subclass 267.1: Electroviscous or electrorheological fluid
Subclass 289: Having varying area of metering rod extending through orifice in thrust member
Subclass 322.14: Foot valve

Class 267: Spring Devices

Vehicle-springs, elastic extension devices, reciprocating-bed-cushioning devices, and miscellaneous spring structures which are not peculiar to any particular art.

Subclass 64.13: Including compressible liquid
Subclass 64.15: With retarder