Vibration Isolator Low Elevation Seismic Restraint
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Solution Overview
Problem
Traditional seismic isolators for large equipment outdoors face issues with load sharing among snubbing elements, which affects their design capacity, and require frequent maintenance due to complex attachment hardware, making them obsolete under new building codes.
Innovation Solution
A vibration isolator with a low elevation seismic restraint design featuring a U-shaped support member, vibration isolating springs, a seismic snubber with adjustable snubber elements, and a snubbing limit plate, allowing for even load distribution and easy maintenance without disturbing the equipment, with the ability to mix and match components for optimal site conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple smaller snubbing elements are used on traditional isolators, then the design capacity is increased, but the load sharing among elements becomes unequal and reliability decreases
Solution Approach 1:
The patent combines multiple snubbing elements into a single integrated snubber assembly with a common shaft and housing structure. This merging ensures that the load is distributed equally among the snubbing elements through the rigid connection of the shaft and housing, eliminating the load sharing problems that occur with separate, independent snubbing elements in traditional isolators.
Solution Approach 2:
The snubber assembly is segmented into replaceable components including the shaft, housing, and snubbing elements that can be independently serviced. This segmentation allows maintenance without disturbing the supported equipment while maintaining the integrated load-sharing structure during operation.
2Strength
If complex attachment hardware is used in traditional isolators, then the restraint capacity is increased, but the maintenance frequency increases and ease of repair decreases
Solution Approach 1:
The isolator is divided into modular segments including the support member, top plate, and snubber assembly that can be independently accessed and replaced. The snubber assembly itself is segmented into replaceable components (shaft, housing, snubbing elements) that can be serviced without replacing the entire isolator or disturbing the supported equipment.
Solution Approach 2:
The snubber assembly is extracted as a separate, removable unit from the isolator system. This allows the snubbing elements to be replaced without disturbing the supported equipment or the main isolator structure, significantly reducing maintenance complexity and frequency.
3Strength
If the lower portion of the housing has a higher profile, then the restraint capacity is increased, but the loads on the attachment hardware increase
Solution Approach 1:
The snubber assembly extends vertically through the support member via a through-hole, utilizing the vertical dimension to provide restraint capacity. This dimensional approach allows the snubbing elements to engage with the support member at a lower elevation, reducing the lever arm and consequently the loads on the attachment hardware while maintaining adequate restraint capacity.
4Stability of the object's composition
If snubbing elements are integrated into the housing, then the structural integrity is increased, but the ease of maintenance decreases
Solution Approach 1:
The snubber assembly is segmented into the shaft, housing, and snubbing elements as separate but interconnected components. This segmentation maintains the structural integrity of the assembled unit during operation while allowing individual components to be replaced independently during maintenance without affecting the overall structure or supported equipment.
Solution Approach 2:
The snubber assembly is pre-assembled as a complete unit with all snubbing elements properly positioned and secured in the housing before installation. This preliminary assembly ensures structural integrity during installation while simplifying maintenance, as the entire assembly or individual components can be replaced as a prepared unit without complex field assembly procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures equal load sharing among snubbing elements, reduces hardware loads, and allows for field replacement of components, enhancing the seismic isolator's capacity and maintenance efficiency while maintaining equipment stability.
Implementation Method 1
at least two vibration isolating members, each having a first end and a second end, wherein the vibration isolating members second ends are seated on the support member opposing end portions
Implementation Method 2
a first snubber element mounted to the shaft element second end, such that seismic movement is limited by the snubbing limit plate and the support plate
Data Source
AI summary
A vibration isolator with low elevation seismic restraint comprises a support member, at least two vibration isolating members, a top plate, a seismic snubber and a snubber limit plate. The vibration isolating members, are seated on the support member opposing end portions. The top plate has a middle portion and opposing end portions, wherein the top plate spans over the vibration isolating members, such that the vibration isolating members are between the support member and the top plate. The seismic snubber has a shaft element that is mounted to the top plate on one end. A snubbing limit plate is mounted to the support member such that it spans the U shaped support member middle portion, wherein the shaft member second end is between the snubbing limit plate, and the support member. The shaft member passes through the support member via a through-hole, and a first snubber element mounted to the shaft element second end, such that seismic movement is limited by the snubbing limit plate and the support plate.