Jaw Assembly Pivot Alignment Guide Pins
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Solution Overview
Problem
The existing jaw assembly for tools faces difficulties in aligning and inserting a single pivot pin into pivot pin holes, making the assembly process cumbersome and prone to misalignment.
Innovation Solution
The jaw assembly incorporates concave surfaces and cam surfaces to guide rollers, which align and pivotably connect the jaws, and includes guide pins, guide ribs, or machined surfaces to facilitate alignment of pivot holes, allowing for easier attachment to a tool frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pivot pin is used to connect the jaws to the frame, then the structure is simplified, but the alignment and insertion process becomes difficult and time-consuming
Solution Approach 1:
The guide pins are pre-installed in the frame to establish alignment references before the jaws are attached. This preliminary alignment action enables the pivot pin holes in the jaws to be automatically positioned correctly relative to the frame, making the subsequent pivot pin insertion straightforward without requiring complex manual alignment procedures
Solution Approach 2:
Guide pins serve as intermediary elements between the frame and the jaws during assembly. These guide pins temporarily establish the geometric relationship and alignment between components, facilitating the correct positioning of pivot pin holes before the final pivot pin connection is made, thus mediating the alignment process
2Ease of operation
If multiple alignment features are added to facilitate pivot pin insertion, then ease of assembly is improved, but device complexity increases
Solution Approach 1:
The alignment function is segmented from the main structural components and implemented through separate, dedicated guide pins. This segmentation allows the guide pins to be independently positioned and installed to provide alignment references, while the jaws and frame maintain their primary structural functions without additional complex alignment features integrated into them
Solution Approach 2:
Instead of adding complex alignment features throughout the entire jaw assembly, the solution applies local quality by installing simple guide pins only at the specific locations where alignment is needed in the frame. This localized approach provides the necessary alignment functionality without increasing the overall complexity of the entire device
Data Source
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AI summary
A jaw assembly including a first jaw, a second jaw, and a pivot pin. The first jaw has two spaced first ears having pivot pin holes through the first ears. The second jaw has two spaced second ears having a pivot pin holes through the second ears. The pivot pin is located in the pivot pin holes to pivotably mount the first and second jaws to each other. The pivot sections include a guide surface configured to guide alignment of the ears relative to each other to thereby align the pivot pin holes with each other. The jaws each include a rear end with a roller contact surface configured to be moved apart by rollers of a roller assembly of a tool. The rear ends each include a concave surface configured to locate one of the rollers therein.