Expandable Wedge Shim for Precise Excavator Attachment Fit
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Solution Overview
Problem
Existing methods for attaching and adjusting excavator buckets are cumbersome, time-consuming, and inadequate regarding precision and stability, leading to premature wear and operational inefficiencies due to loose fittings.
Innovation Solution
An expandable shim system comprising two plates with opposing wedges that adjust laterally by rotation, allowing secure and precise fitting of excavator buckets and thumbs without disassembly, using locking bolts for adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional shimming methods are used (removing bucket, using heavy lifting equipment, installing non-adjustable shims), then the shimming process can be completed, but the process is cumbersome, time-consuming, and requires disassembly of components
Solution Approach 1:
The shim pack is designed with adjustable thickness capability, allowing it to be dynamically modified in the field. The multiple shims of varying thicknesses can be added or removed to achieve the precise fit needed, transforming a static shimming solution into a dynamic, adjustable one that adapts to wear conditions without requiring complete disassembly and shop-based rework
Solution Approach 2:
The shim pack is segmented into multiple individual shims of different thicknesses that can be independently added or removed. This segmentation allows for precise adjustment of the total shim thickness to match the specific wear gap, enabling field adjustment without requiring custom-machined single-piece shims or complete component disassembly
2Stability of the object's composition
If non-adjustable shims are installed, then the fitting can be tightened, but the shims cannot be adjusted for precision and stability
Solution Approach 1:
The shim pack transitions from a fixed, non-adjustable configuration to a dynamic, adjustable system. Operators can add or remove individual shims of specific thicknesses to precisely match the wear gap measurements, ensuring both stability through tight fitting and precision through customizable thickness adjustment
Solution Approach 2:
The total thickness parameter of the shim pack can be changed by adding or removing individual shims. This parameter adjustment allows the shim pack to be customized for each specific wear condition, achieving precise fits that maintain stability while adapting to varying gap sizes without requiring new shim fabrication
3Productivity
If the bucket is left loose without proper shimming, then operational continuity is maintained, but premature wear occurs and control is reduced
Solution Approach 1:
The shim pack is pre-assembled with multiple shims of varying thicknesses before field installation. This preliminary preparation allows operators to quickly adjust the total thickness to match measured wear gaps without needing to disassemble the bucket or perform complex shop-based shimming procedures, maintaining operational continuity while ensuring proper fit and reliability
Solution Approach 2:
The shim pack system enables field operators to perform their own shimming adjustments without requiring specialized shop equipment or heavy lifting capabilities. The pre-packaged shims can be easily added or removed by operators using basic tools, allowing them to self-correct wear issues and maintain connection reliability while keeping equipment in service
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
Enhances operational efficiency and safety by simplifying the shimming process, reducing wear, and maintaining precise control over excavator attachments.
Implementation Method 1
The plurality of wedges of the first plate and the plurality of wedges of the second plate can be sized and positioned such that relative rotation between the first plate and the second plate changes the distance between the outside surface of the first plate relative to the outside surface of the second plate.
Data Source
AI summary
This document discloses an adjustable shim system. The adjustable shim system a first member defining an opening for receiving a shaft The first member can have a first side defining an outside surface and a second side generally opposite the first side and at least one wedge extending from the second side. The adjustable shim system can further include a second member having a first side defining an outside surface and a second side generally opposite the first side and at least one wedge extending from the second side. The adjustable shim system can further include a fastener engaged with the first member and the second member, the fastener being configured to selectively fix the outside surface of the first member relative to the outside surface of the second member.