Extendable Baton Locking Mechanism Strength Reliability
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Solution Overview
Problem
Existing extendable batons for police and military use face durability issues due to weakened sections from slots for locking clutches and require lubrication for O-rings, which can attract dirt and lead to operational failures.
Innovation Solution
The design incorporates a single slot and clutch plate for each locking clutch, reducing the number of potential weak points and eliminating the need for lubrication by using low-friction compression rings instead of elastomeric O-rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple slots are cut into baton sections for locking clutches, then the locking mechanism can engage and disengage reliably, but the section ends become weakened and may fail under impact forces
Solution Approach 1:
The locking clutch is segmented into two functional parts: a single slot cut into the baton section end and a separate clutch plate with an arc-shaped locking portion. This segmentation allows the slot to be minimal and strong while the clutch plate provides the locking function, resolving the contradiction between reliability and strength.
Solution Approach 2:
The clutch plate is extracted as a separate component from the baton section, allowing it to be made of a different material or treated differently. The clutch plate can be heat-treated or made from a more durable material to compensate for the material removed from the baton section to create the slot, thereby maintaining section strength while enabling reliable locking.
2Ease of operation
If elastomeric O-rings are used to reduce play between sections, then smooth operation is achieved, but lubrication is required which attracts dirt and can dry out, seizing the baton
Solution Approach 1:
The elastomeric O-ring mechanical system is replaced with a low-friction compression ring system that does not require lubrication. This substitution eliminates the harmful effects of lubricant attraction and drying out, while maintaining smooth operation through the inherent low-friction properties of the compression ring material and design.
3Strength
If a single slot and clutch plate design is used, then section end strength is improved, but the locking mechanism complexity must be maintained
Solution Approach 1:
The slot and clutch plate are merged into a simple, integrated locking system where the arc-shaped locking portion of the clutch plate naturally engages with the slot geometry. This merging eliminates the need for complex alignment mechanisms, multiple components, or complex control systems, maintaining simplicity while providing reliable locking with improved strength.
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
This solution enhances the durability and reliability of the baton by strengthening the section ends and eliminating maintenance concerns related to lubrication, while also reducing manufacturing costs.
Implementation Method 1
at least one spring disposed to bias the clutch plate outwardly from the slot of the extendable section
Implementation Method 2
eliminating the need for lubrication by using low-friction compression rings instead of elastomeric O-rings
Data Source
AI summary
An extendable baton has a base section, at least one extendable section and a control rod. The base section may be tubular and have a lengthwise axis and an annular recess on an inner surface of a distal end and a release button on a proximal end. The extendable section may be tubular and nest inside the base section. The extendable section includes a locking clutch including a single slot disposed on the proximate end, a clutch plate disposed at least partially within the slot, the clutch plate including a locking portion, which engages the annular recess and a control aperture portion having an aperture, and at least one spring disposed to bias the clutch plate outwardly from the slot of the extendable section. The control rod is insertable through the aperture to retract the clutch plate when the release button is depressed.