Mechanical double acting shock isolator

Details Mechanical double acting shock isolator Mechanical double acting shock isolator

2001-07-10

2003-02-04

Schwartz, Christopher P. (Department: 3613)

Spring devices

Vehicle

Mechanical spring and nonresilient retarder

C267S135000, C267S134000

Reexamination Certificate

active

06513800

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to an improved mechanical double acting shock isolator for supporting and isolating a body from a multi-acting force.
BACKGROUND OF THE INVENTION
Many vibration or shock sensitive pieces of equipment must be protected from earthquakes and other similar types of events that produce random shock waves in order to insure the operability of the equipment. Shock absorbers have been devised for this purpose, however, for the most part these devices rely on fluids for their shock absorbing properties. Furthermore, these double acting fluid shock absorbers are generally extremely complex in nature and will, over time, develop seal leaks which, of course, will adversely effect performance and eventual failure of the device. Mechanical shock isolators are also known in the art which rely on various spring arrangements for their energy absorbing properties. The mechanical spring equipped devices generally are unidirectional in nature and do not lend themselves to use in multi-directional shock absorbers or isolators where the spring must respond uniformly to both compressive and tensile forces.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to improve mechanical double acting shock isolators.
It is a further object of the present invention to simplify the design of a mechanical double acting shock isolator.
It is still a further object of the present invention to reduce the number of component parts needed to construct a double acting mechanical shock isolator.
Another object of the present invention is to increase the operating life and reliability of double acting mechanical shock isolators
These and other objects of the present invention are attained by a double acting mechanical shock isolator that includes a cylindrical housing that is closed at each end by a pair of end walls. A stack of friction springs is mounted within the housing between a pair of tubular slides. When the friction spring stack is in a neutral position, the slides are held in contact against the end walls of the housing. A sleeve passes through the stack and each end of the sleeve is contained within one of the tubular slides. One end of the sleeve is further secured to a shaft that passes out of the housing through an adjacent end wall. Each slide is connected to the sleeve by a lost motion device that engages the overlying slide when the sleeve is moved axially toward the opposing slide and releases the slide when the sleeve is moved in the opposite direction. In practice, the housing can be held stationary while an axial load is applied to the shaft, or the housing is attached to the load and the shaft is held stationary. Either a tensile or compressive load applied to the shaft will cause the friction spring stack to compress uniformly in either direction.


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