Fastener Outlet Assembly with Movable Cover Detector
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Solution Overview
Problem
Existing fastener driving tools often require manual retraction of the nose part against a workpiece before firing, and include mechanical detectors to prevent 'dry-firing' by ensuring a fastener is present, but these systems can be cumbersome and prone to misalignment or jamming.
Innovation Solution
A fastener outlet assembly with a movable cover and detector that allows access for clearing jams and detects fastener presence, allowing the nose part to retract only when a fastener is properly aligned, ensuring safe and efficient firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical detector is added to detect fastener presence, then dry-fire prevention is improved, but device complexity increases
Solution Approach 1:
The detector is integrated into the cover structure, merging the detection function with the existing cover component. The cover itself becomes part of the detection mechanism, eliminating the need for a completely separate detector assembly and reducing overall device complexity while maintaining dry-fire prevention capability
Solution Approach 2:
The cover serves multiple functions: it provides access to the outlet passage for clearing jams, acts as part of the wall structure, and incorporates the detection function through its movable connection to the detector. This multi-functionality reduces the need for additional components and simplifies the overall device structure
2Reliability
If the nose part is prevented from retracting without fastener, then dry-fire lock-out is improved, but ease of operation deteriorates
Solution Approach 1:
The system automatically prevents nose part retraction when no fastener is detected, and automatically allows retraction when a fastener is present. The detector and nose part mechanism work together to provide automatic control without requiring user intervention or complex manual operations, maintaining ease of operation while ensuring reliability
3Reliability
If the detector is made movable relative to the cover, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The detector is made movable relative to the cover, allowing it to dynamically adjust its position based on the presence or absence of a fastener. This dynamic capability enables the detector to reliably detect fastener presence while maintaining a relatively simple mounting structure that leverages the existing cover movement rather than requiring completely independent actuation mechanisms
Data Source
AI summary
A fastener outlet assembly for a fastener driving tool includes: an outlet passage arranged to expel fasteners from the assembly to a workpiece during use, the outlet passage having one or more walls; and a detector arranged to detect whether a fastener is present in the outlet passage. The detector comprises at least part of a cover that provides at least part of a wall of the outlet passage, the cover being movable with respect to the remainder of the outlet passage to open the outlet passage and gain access thereto.