Retractable Probe Assembly for Workpiece-Safe Fastener Positioning
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Solution Overview
Problem
Existing fastener driving tools with fixed or pivotable locating probes often cause damage to workpieces during the fastener driving process, resulting in an undesirable aesthetic appearance.
Innovation Solution
A retractable probe assembly that slides and pivots relative to the workpiece contact element, tensioned by a low-tension spring, allowing full retraction of the probe to align with the free end member of the WCE, minimizing contact with the workpiece during fastener driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed or pivotable locating probe is used, then the probe can locate the desired position on the workpiece, but the probe causes damage to the workpiece area adjacent to the fastener head
Solution Approach 1:
The probe is made dynamically retractable rather than fixed or pivotable. A spring mechanism automatically retracts the probe after locating the workpiece position, eliminating continuous contact that causes damage. The probe moves from a contact state during positioning to a retracted state during fastener driving, resolving the contradiction between needing probe contact for location and avoiding probe contact to prevent damage.
Solution Approach 2:
The probe performs its locating function in advance before the fastener driving process begins. The spring mechanism ensures the probe is retracted before the fastener is driven, so the probe only contacts the workpiece temporarily for positioning purposes. This preliminary action separates the locating function from the fastening function, allowing precise location without subsequent damage.
2Ease of operation
If the probe remains extended during fastener driving, then locating is simplified, but the area adjacent to the fastener head becomes larger than the head itself, ruining aesthetic appearance
Solution Approach 1:
The probe transitions from an extended state during locating to a retracted state during fastener driving through spring mechanism. This dynamic behavior allows the probe to be extended when needed for location (maintaining ease of operation) and retracted when the fastener is driven (maintaining aesthetic appearance by preventing probe marks adjacent to the fastener head).
Solution Approach 2:
The spring mechanism automatically manages the probe's extension and retraction without operator intervention. The probe extends for locating and self-retracts for fastener driving, making the system self-serving and eliminating the need for manual probe retraction while preserving both operational ease and aesthetic appearance.
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
The retractable probe assembly effectively prevents damage to the workpiece by ensuring the probe is fully retracted during the fastener driving process, maintaining the aesthetic integrity of the workpiece.
Implementation Method 1
a probe that is tensioned by a low-tension spring, and that includes an elongated probe movement slot that provides for such slidable movement of the probe relative to the WCE
Data Source
AI summary
A fastener driving tool including a retractable probe assembly that includes a probe configured to pivot, tensioned by a low-tension spring, and that includes additional probe movement slot that provides for additional movement of the probe, such that retractable probe assembly minimizes damage to the workpiece.