Self-centering clamp using coupled linkages and linear slots
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Solution Overview
Problem
Existing self-centering clamping devices for machines like milling and drill presses are often inaccurate, lack repeatability, and are complex and expensive, failing to provide a simple and reliable method for maintaining a workpiece in a centered configuration.
Innovation Solution
A self-centering clamp design utilizing coupled linkage and slots to constrain opposing jaws for linear movement, ensuring accurate and repeatable centering of workpieces, which can be applied to various configurations including rotary and non-rotary setups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gear-based systems or rack-and-pinion mechanisms are used to provide self-centering functionality, then self-centering capability is achieved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the essential self-centering function from complex gear-based systems and implements it using simple linear guidance slots and direct linkage. The slots in the support substrate extract the guiding function, eliminating the need for complicated mechanical transmission mechanisms while maintaining accurate centering capability.
Solution Approach 2:
The patent replaces complex mechanical transmission systems (gears, rack-and-pinion) with a simpler mechanical guidance system using slots and direct linkage. The linear movement constraints are achieved through geometric constraints of slots rather than through complex mechanical传动 mechanisms.
2Manufacturing precision
If complex arrangements are used to provide self-centering functionality, then centering accuracy is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent segments the clamping device into distinct functional elements: support substrate with slots, coupled linkages, and jaws. This segmentation allows each component to be manufactured separately using simple processes, then assembled to achieve the overall centering function without requiring complex integrated manufacturing.
Solution Approach 2:
The patent employs simple, easily manufacturable components such as slots cut in a support substrate and basic linkage elements. These simple geometric features can be manufactured using conventional machining operations without requiring expensive precision manufacturing, yet they provide accurate centering when properly designed and assembled.
3Ease of operation
If traditional clamping devices are used, then clamping function is provided, but productivity decreases due to constant adjustments
Solution Approach 1:
The patent implements a self-centering mechanism where the coupled linkages and slots automatically maintain workpiece centering during the clamping operation. The system self-corrects and maintains positioning without requiring external adjustment operations, allowing operators to simply apply the clamping force and achieve immediate accurate centering.
Solution Approach 2:
The slots and linkage geometry are pre-configured to automatically guide and constrain the jaws in a centered position before clamping occurs. This preliminary geometric arrangement ensures that when the clamping operation begins, the workpiece is already positioned correctly, eliminating the need for preliminary adjustment operations.
Data Source
AI summary
A clamping device is configured to ensure that a workpiece fixed between the jaws of the clamp is self centered by coupling the jaws to a pair of linkages that rotate through the same angle as the application of a first causes the jaws to translate in linear fashion across the surface of the device. In particular, the clamping device utilizes coupled linkage (e.g., a 180° bell crank), in combination with slots for retaining opposing jaws and maintaining only linear movement of the jaws, thus providing a fast and accurate self-centering arrangement. The clamping device may also be located within a hollow workpiece and controlled to move the jaws outward and engage the inner surface of the hollow workpiece in a self-aligned configuration.