Shock-absorbing feet

While rotators are not explicitly a foot or an ankle, they act to reduce the torque/shear forces on the residual limb due to ambulation over uneven terrain by allowing the socket to rotate independent of foot position. This component may be positioned anywhere in the prosthesis, not just at the ankle, where inertial effects may be problematic (see Fig. 33.17). Since this component adds mass and complexity to the prosthesis, its inclusion may necessitate improved or auxiliary suspension. Another component that is again not a foot or an ankle is shock absorbers. As for the rotators, shock absorbers, which decrease the effective length of the shank during loading, are typically positioned in the shank. 

One final noteworthy lower extremity development in that of shock-absorbing pylons and shockabsorbing feet (Re-Flex VSP, OSSUR/Flex-Foot,... 

B flute. Has the greatest number of corrugations per foot with the lowest flute height. It is stiffer and less shock-absorbent than A flute, but it has greater crush resistance to loads placed in the direction of thickness. 

Several factors must be considered in determining how much distance will be needed for a fall arrest system to work — to prevent the worker from contacting the next lower level. First, under 1926.502(d)(16)(iii), a personal fall arrest system must prevent the employee from contacting the level below. A 6 foot lanyard that incorporates a shock absorbing system may have a total extension of up to about 9V2 feet before a fall is completely arrested. Because the lanyard Is attached to the body harness at a point that is more than half-way up the body, an additional distance of about 3-4 feet must be added to assure that no part of the employee s body makes contact with the surface. 

In the case of Hardness and Cupping Tests, no conversion has been attempted, the metrical values being in general use in this country. As regards Shock Resistance also, no conversion has been attempted. On the Continent the term Resilience is employed to denote the energy absorbed in impact, expressed in kilogramme-metres per square centimetre of cross section of the test piece at the bottom of the notch, whilst in this country, it is employed to denote a different property. The area of cross section at the foot of the notch... 

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