Stackable Shims With Interlocking Projections For Load Distribution
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Solution Overview
Problem
Existing stackable shims lack effective interlocking mechanisms to prevent sliding and ensure even load distribution, particularly when used to support precast concrete products, which requires a solution for secure stacking and handling.
Innovation Solution
The design features planar shims with projections on the top surface and corresponding recesses on the bottom, along with notches for alignment, allowing for reversible interlocking and secure stacking with elastic binding, and projections oriented to resist shear forces from multiple directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional stackable shims are used without interlocking mechanisms, then the shims can be easily stacked to achieve desired thickness, but the shims slide relative to each other during handling and use
Solution Approach 1:
The patent implements interlocking mechanisms where protrusions on one shim fit into recesses on adjacent shims, creating a nested interlocking pattern that prevents sliding while maintaining stackability. This allows shims to be stacked to desired thicknesses while maintaining stability during handling and use.
2Stability of the object's composition
If shims are designed with interlocking projections and recesses, then sliding between shims is prevented, but the complexity of the shim design increases
Solution Approach 1:
The interlocking mechanism is implemented locally at specific regions of the shim surfaces rather than across the entire surface. Protrusions and recesses are positioned at strategic locations to provide sufficient interlocking while maintaining simplicity in the overall design and manufacturing process.
3Adaptability or versatility
If multiple shims are stacked to achieve desired thickness, then versatility in supporting structures of varying thicknesses is achieved, but even load distribution becomes difficult to ensure
Solution Approach 1:
The interlocking protrusion-recess mechanism is designed in advance to automatically align and distribute loads evenly across the stack. The geometric configuration of the interlocking features ensures that when shims are stacked, the load is transmitted uniformly through each interface, preventing point loads and ensuring even stress distribution without requiring additional adjustment.
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
This solution provides a secure, even load distribution and prevents sliding of shims during handling and use, ensuring stability and versatility in supporting structures of varying thicknesses and orientations.
Implementation Method 1
creating sufficient friction to engage the adjacent shim and prevent separation during handling
Data Source
AI summary
A set of stackable, planar shims is provided, with each shim having a series of projections on the top surface and corresponding recesses on the bottom surface, wherein the projections overlay the recesses. Each shim may be characterized by a bisecting line, with the series of projections and recesses being a reverse image of each other, on either side of the bisecting line. Notches in opposite corners of the shims facilitate aligning the shims in an interlocking arrangement, regardless of which surfaces of the shims are pressed into contact. The projections on the surface of the shim can be arranged to create a barrier to shear forces that are perpendicular to the sides of the shim and diagonal to the sides of the shim.