Power Tool Retention Mechanism for Drive Screw Protection
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Solution Overview
Problem
Existing power tools, such as hydro-pneumatic blind threaded insert placing tools, face issues with drive screw damage and thread wear, leading to inefficient spin-on and spin-off processes, and require time-consuming tool changes for different rivet diameters, which can result in lost rotational drive and mechanical failure.
Innovation Solution
A manually-actuable retention and release mechanism with a detent system that ensures secure coupling of the drive screw to the mounting member without the need for tools, using a biased detent that locks and releases to prevent uncoupling and facilitate quick tool changes, allowing for compact and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manually held power tool is used for rivet setting, then operator flexibility and manual dexterity are improved, but the risk of dropping the tool and damaging the drive screw increases
Solution Approach 1:
The patent applies beforehand cushioning by implementing a protective mechanism that prevents damage to the drive screw before it can occur. The quick-release coupling mechanism allows the operator to quickly detach the drive screw if the tool is dropped or if damage is anticipated, preventing bending or thread damage. This proactive approach protects the critical drive screw component while maintaining manual operation flexibility.
2Duration of action of stationary object
If the drive screw thread becomes worn or damaged during use, then the tool can continue operating, but the operator cannot remove the drive screw from the set rivet
Solution Approach 1:
The patent applies dynamics by implementing a dynamic quick-release coupling mechanism that transitions from a permanently engaged state to a easily releasable state. The detent-based locking system allows the coupling to be securely engaged during operation but can be quickly released by actuating the release mechanism. This dynamic design ensures that even after extended use, the drive screw can be rapidly removed and replaced without difficulty, maintaining operational flexibility throughout the tool's service life.
3Adaptability or versatility
If the drive screw is changed to accommodate different rivet diameters, then adaptability is improved, but the time required for tool changes increases
Solution Approach 1:
The patent applies preliminary action by designing the quick-release coupling mechanism in advance, so that all components are pre-configured for rapid exchange. The detent-based locking system and release mechanism are built into the design, allowing the operator to simply actuate the release and swap drive screws without requiring tools or complex procedures. This pre-engineered quick-change capability enables rapid adaptation to different rivet diameters, minimizing tool change time while maintaining full adaptability.
4Reliability
If a traditional retention mechanism is used for the drive screw, then secure retention is achieved, but the mechanism becomes complex and requires tools for operation
Solution Approach 1:
The patent applies taking out by extracting the complex multi-component retention mechanisms from traditional designs and replacing them with a simplified detent-based quick-release system. The invention uses a minimal number of components - primarily the detent elements and spring - to achieve secure retention during operation while enabling tool-free quick release. This extraction of unnecessary complexity maintains reliable drive screw retention throughout the patent.
Data Source
AI summary
A manually-actuated retention and release mechanism is disclosed for use with a blind threaded rivet setting tool. The mechanism has a cap with an internal screw thread which retains a drive screw immovably to a spindle such that axial or rotational movement of the spindle results in concomitant movement of the drive screw. The cap cooperates with a manually-actuable bar via series of serrations formed on the cap, each of which serrations is a latch point for the bar. Movement of the bar into or out of engagement with the serrations dictates whether or not the cap is locked in position.