Telescopic Spindle Mechanism With Slip Threads for Safe Retraction
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Solution Overview
Problem
Existing telescopic mechanisms for toys and other applications lack a safe and efficient method to extend and retract segments without causing injury or damage, particularly when encountering rigid objects, and often require rigid friction stops that can lead to unintended extension or retraction.
Innovation Solution
A telescopic mechanism featuring flexible and resilient nut threads that engage with a spindle, allowing for safe extension and retraction by sliding over the spindle threads when a threshold force is applied, and incorporating a segment extension stopper to prevent over-extension, ensuring segments retract automatically when pressure is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid friction stops are used to prevent over-extension, then segment extension is controlled, but the mechanism becomes complex and may lead to unintended extension or retraction
Solution Approach 1:
The patent removes the complex rigid friction stop mechanism and replaces it with a simple resilient nut thread design. The nut thread itself provides the stopping function through its resilient properties, eliminating the need for separate friction stop components and reducing overall mechanism complexity while maintaining reliable control over segment extension.
Solution Approach 2:
The patent changes the physical parameter of the nut thread from rigid to resilient. This parameter change allows the nut thread to provide both the extension control function and the over-extension protection function through its elastic deformation characteristics, simplifying the mechanism while improving reliability.
2Strength
If rigid connection elements are used to attach segments, then segments are securely held, but the mechanism cannot safely retract when encountering rigid objects
Solution Approach 1:
The patent changes the connection element from rigid to resilient. The resilient nut thread maintains strong attachment during normal operation through its elastic properties, but allows controlled slippage when subjected to excessive force from rigid objects, thereby preventing injury or damage while maintaining secure connection strength.
Solution Approach 2:
The resilient nut thread acts as a pre-designed cushioning element that absorbs excessive force before it can cause harm. The resilient material is selected to deform and slip under extreme load, providing beforehand protection against the harmful effects of rigid object contact.
3Force
If sturdy nut threads are used to prevent slippage, then extension force is maintained, but the segments cannot automatically retract when pushed into rigid objects
Solution Approach 1:
The patent changes the nut thread parameter from completely rigid to resilient with controlled slip characteristics. This allows the thread to maintain extension force through elastic deformation during normal operation, but automatically retract when the resilient material deforms beyond its elastic limit due to external force from rigid objects.
Solution Approach 2:
The patent converts the potentially harmful slippage that occurs when pushed into rigid objects into a beneficial automatic retraction mechanism. The resilient nut thread is designed to slip under excessive force, and this slippage is harnessed to automatically retract the segments, turning a harmful effect into a safety feature.
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 provides a safe and automatic extension and retraction of telescopic segments, preventing unintended poking forces and allowing for quick retraction without damaging the mechanism, while enabling easy swapping of blade segments and incorporating illumination features for enhanced functionality.
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
Implementation Method 3
the nut threads are flexible and resilient enough whereby the nut threads will slide over the spindle threads
Data Source
AI summary
A telescopic mechanism including hollow telescopic blade segments with a threaded spindle having spindle threads within the telescopic blade segments. Nuts are configured to correspond and interface with the spindle, and a power mechanism is configured to spin the spindle. Each of the nuts respectively interfaces at the proximal portion of each of the hollow blade segments and the nuts have nut threads corresponding to the spindle threads. The nut threads allow back and forth movement over the spindle threads when the spindle is rotated; however, the nut threads will slide over the spindle threads if the distal telescopic blade segment is pushed above a given threshold force.