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| Machine tool, particularly band saw, with lightweight saw band carrier |
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| Fluid free damper |
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| Vibration isolation grommet |
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| Method for restraining vibration of a building and structure therefor |
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| Thermoplastic cover for stadium seating, picnic tables, boat docks and the like |
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| Auxiliary support mechanism for an automotive hoist |
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Shock absorber
| Details |
Inventors: Housman, Joseph J.;
Assignee: General Atomic Company (San Diego, CA)
Primary Examiner: Engle; Samuel W.
Assistant Examiner: Cangialosi; S. A.
Attorney, Agent or Firm: Fitch, Even, Tabin & Luedeka
A shock absorber is described for use in a hostile environment at the end of a blind passage for absorbing impact loads. The shock absorber includes at least one element which occupies the passage and which is comprised of a porous brittle material which is substantially non-degradable in the hostile environment. A void volume is provided in the element to enable the element to absorb a predetermined level of energy upon being crushed due to impact loading. |
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DETAILED DESCRIPTION What is claimed is: 1.
In combination with a nuclear reactor core structure having a blind control rod passage, a shock absorber comprising a plurality of rigid fracturable elements having a lateral size sufficient to occupy a substantial portion of the cross-sectional area of said control rod passage and having a longitudinal size sufficient to extend axially in said passage, said element being positioned in said passage adjacent the blind end thereof, said element being composed solely of a porous brittle carbonaceous material, a porous brittle ceramic material, or a porous brittle refractory oxide, said elements having a plurality of parallel holes extending longitudinally therethrough and parallel with the longitudinal axis of the passage, said holes providing a void volume of between 30% and 70% of the total volume of the elements corresponding to a predetermined level of energy absorption by said elements upon being fractured due to impact loading by a control rod.
2.
A combination according to claim 1 wherein the material of which said element is comprised is carbon.
3.
A combination according to claim 2 wherein the carbon is porous having a density of between about 30% and about 70%.
4.
A combination according to claim 1 wherein said element is substantially cylindrical.
5.
A combination according to claim 1 including a further element having no void volume therein positioned furthest away from the blind end of said passage.
6.
A combination according to claim 5 including three of said elements and said further element.
Description:
This invention relates generally to shock absorbers and, more particularly, to an improved shock absorber suitable for use in a hostile environment in which the shock absorber will retain its energy absorbing qualities without substantial degradation.
Certain types of shock absorbers are designed to absorb the energy of a falling body upon impact to prevent excessive damage to the body.
One example of such a device is the type of shock absorber used at the end of a blind passage in a nuclear reactor core structure for absorbing the energy of a falling control rod during emergency shut-down of the reactor core
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Vibration and Earthquake Isolation 
