Retractable Probe Assembly for Damage-Free Fastener Driving
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Solution Overview
Problem
Existing fastener driving tools with fixed or pivotable locating probes often cause damage to workpieces during the fastening process, resulting in an undesirable aesthetic appearance due to the enlarged impact area around the fastener head.
Innovation Solution
A retractable probe assembly in the fastener driving tool that slides and pivots relative to the work-piece contact element (WCE), allowing full retraction and minimizing contact with the workpiece during the fastening process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed or pivotable locating probe is used, then the probe can locate and guide the fastening process, but the probe causes damage to the workpiece and enlarges the impact area around the fastener head
Solution Approach 1:
The probe is designed to be retractable rather than fixed, allowing it to dynamically change its position relative to the workpiece. The probe can extend during the locating phase to provide precise positioning, then retract before the fastening operation to eliminate workpiece damage. This dynamic transformation resolves the contradiction between needing the probe extended for locating precision and needing it retracted to avoid harmful effects.
Solution Approach 2:
The locating probe performs its function of positioning and guiding in advance of the fastening operation. By completing the locating action before the fastening cycle begins, the probe can then be retracted or positioned to avoid interfering with the fastening process and causing damage. This preliminary action allows the probe to fulfill its locating precision function without subsequently causing workpiece damage.
2Measurement precision
If the probe remains extended during fastening, then locating precision is maintained, but the aesthetic appearance of the workpiece deteriorates due to enlarged impact area
Solution Approach 1:
The probe transitions from an extended state during locating to a retracted state during fastening. This dynamic position change ensures that the probe does not remain in a position that would enlarge the impact area and compromise aesthetic appearance, while still providing locating precision when needed. The retractable mechanism allows the probe to be out of the way during the critical aesthetic phase of fastening.
3Object-affected harmful factors
If a retractable probe assembly is implemented, then workpiece damage is prevented and aesthetic appearance is maintained, but the device complexity increases
Solution Approach 1:
The probe is designed to nest within or retract into the nosepiece assembly housing. This nesting arrangement allows the probe to be stored compactly when not in use and to extend only when needed for locating, thereby preventing workpiece damage during fastening while minimizing the overall complexity by efficiently utilizing the existing nosepiece assembly space.
Solution Approach 2:
The retractable probe assembly serves multiple functions: it provides locating precision when extended, and it prevents workpiece damage when retracted. By integrating the locating and protective functions into a single multi-functional assembly, the design addresses workpiece protection needs without proportionally increasing complexity, as the same mechanism enables both beneficial functions.
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.