Telescopic Spindle Mechanism With Force-Triggered Safe Retraction
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Solution Overview
Problem
Existing telescopic mechanisms for toys like swords lack a safe and efficient way to extend and retract segments, particularly when encountering rigid objects, which can lead to accidental retraction or failure to extend fully.
Innovation Solution
A telescopic mechanism featuring flexible and resilient nut threads that engage with a threaded spindle, allowing for extension and retraction while providing a safety feature to slide over the spindle threads when a threshold force is applied, preventing accidental retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid nut threads are used to engage with the spindle, then the mechanism can extend fully and maintain structural strength, but the mechanism cannot retract when encountering rigid objects
Solution Approach 1:
The nut threads are designed with flexible and resilient material properties that allow them to change their mechanical characteristics. Under normal extension forces, they maintain rigid engagement with the spindle threads. When excessive force is detected (pushing into rigid objects), the flexible material allows the nut threads to slide over the spindle threads, enabling automatic retraction and preventing damage.
2Adaptability or versatility
If flexible nut threads are used to allow retraction, then the mechanism can retract when encountering rigid objects, but the mechanism cannot extend fully or maintain structural strength
Solution Approach 1:
The flexible resilient material exhibits conditional mechanical behavior: under low-to-moderate extension forces, the material maintains sufficient rigidity for full extension and structural strength. When excessive force is applied (indicating contact with rigid objects), the material's flexibility activates, allowing the nut threads to slide over the spindle threads for safe retraction.
3Stability of the object's composition
If the nut threads are made sturdy to prevent movement during extension, then extension is controlled, but the mechanism cannot retract when pushed into rigid objects
Solution Approach 1:
The flexible resilient material creates a force-dependent engagement system. During normal extension, the material's stiffness provides stable, controlled movement of the nut along the spindle. When excessive force is detected (pushing into rigid objects causing accidental retraction risks), the material softens and allows the nut threads to slide over the spindle threads, converting a potentially harmful accidental retraction into a safe protective mechanism.
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 mechanism enables safe and efficient extension and retraction of telescopic segments, preventing accidental retraction when encountering rigid objects and allowing for quick retraction and extension without damaging the mechanism.
Implementation Method 1
the nut threads are flexible and resilient enough whereby the nut threads will slide over the spindle threads if the distal telescopic blade segment is pushed above a given or predetermined threshold force
Implementation Method 2
one or more nut-to-segment friction members having a resilient arm with an outwardly facing shoulder to provide a finite but minimal friction resistance with the blade segments to prevent the blade segments from spontaneously retracting
Data Source
AI summary
A method of providing a telescopic assembly includes providing a power mechanism to rotate a threaded spindle which is coupled to telescopic segments. Rotating the threaded spindle causes the telescopic segments to extend out of a handle to an extended position. A safety feature is provided such that, if the telescopic segments in the extended position are pressed by a poking force against a person, the poking force causes the telescopic segments to retract in a direction towards the handle thereby preventing injury to the person, and the power mechanism and the threaded spindle are not compromised or destroyed by retraction of the telescopic segments due to the poking force.