Quick-Release Positioning Pin for Table Saw Guard Assembly
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Solution Overview
Problem
Conventional table saw protective devices have complex structures that complicate manufacturing and assembly, leading to potential errors during installation.
Innovation Solution
A detachable protective device for a table saw featuring a base support, mounting unit, protective covers, and a quick-release unit with a positioning pin that shifts between locked and release positions, allowing easy assembly and secure attachment to the table saw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional locking device with multiple components (crank member, detent pin, crankpin) is used to secure the adapter to the base, then the attachment reliability is improved, but the device complexity and manufacturing difficulty increase significantly
Solution Approach 1:
The positioning pin is divided into two functional segments: a large-diameter section for locked positioning and a small-diameter section for release positioning. This segmentation allows a single component to perform multiple functions that previously required multiple components, simplifying the locking mechanism while maintaining reliability.
Solution Approach 2:
The patent merges the functions of the detent pin, crank member, and crankpin into a single integrated positioning pin structure. The positioning pin combines both the locking function (large-diameter section) and the release function (small-diameter section) into one component, eliminating the need for separate crank mechanisms and reducing assembly complexity.
2Reliability
If a complex locking device with multiple components is used, then the attachment reliability is improved, but the ease of manufacture and assembly deteriorates
Solution Approach 1:
The positioning pin is divided into two functional segments: a large-diameter section for locked positioning and a small-diameter section for release positioning. This segmentation allows a single component to perform multiple functions that previously required multiple components, simplifying the locking mechanism while maintaining reliability.
Solution Approach 2:
The positioning pin structure enables self-service functionality where the same component automatically performs both locking and releasing operations. The operator simply needs to pull the positioning pin, which automatically transitions from the large-diameter locked position to the small-diameter release position, eliminating the need for complex crank mechanisms and detent systems.
3Reliability
If a positioning pin with large-diameter section is used to prevent removal, then the attachment reliability is improved, but the ease of operation for quick release deteriorates
Solution Approach 1:
The positioning pin is divided into two functional segments: a large-diameter section for locked positioning and a small-diameter section for release positioning. This segmentation allows a single component to perform multiple functions that previously required multiple components, simplifying the locking mechanism while maintaining reliability.
Solution Approach 2:
The positioning pin transitions dynamically between two states: a locked state where the large-diameter section engages with the mounting hole to prevent removal, and a release state where the pin is pulled back to allow the small-diameter section to pass through the mounting hole. This dynamic transition enables quick release operation while maintaining secure attachment when locked.
Data Source
AI summary
A detachable protective device includes a base support, a mounting unit connected to the base support, and a quick-release unit. The base support has a mounting hole having an engaging portion and an open end portion. The quick-release unit includes a positioning pin extending movably through the mounting hole. The quick-release unit is operable to move the positioning pin between a locked position, where a large-diameter section of the positioning pin is disposed in the engaging portion, and a release position, where a small-diameter section of the positioning pin is disposed in the engaging portion, thereby allowing separation of the mounting unit from the base support.