Fire Hydrant Anti-Rotation Pin System for Weight Reduction
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Solution Overview
Problem
Fire hydrants are excessively heavy and complex, requiring multiple people or machinery for maintenance, which poses safety risks and violates lifting guidelines, and their design is constrained by regulatory standards that limit weight reduction.
Innovation Solution
A fire hydrant design featuring a reduced-weight upper barrel with an anti-rotation pin system that facilitates easier handling and maintenance by minimizing material usage and eliminating unnecessary parts, while maintaining regulatory compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fire hydrant weight is reduced to enable manual handling, then ease of operation and safety improve, but structural strength and durability may deteriorate
Solution Approach 1:
The fire hydrant is divided into multiple components: upper barrel, lower barrel, bonnet, head, and stem. This segmentation allows each part to be optimized independently for weight reduction while maintaining overall structural strength through proper material selection and design of each component.
Solution Approach 2:
The patent utilizes composite construction techniques where different materials are employed for different components based on their specific functional requirements. This allows weight reduction in non-critical areas while maintaining strength in load-bearing components, resolving the contradiction between lightweight design and structural integrity.
2Ease of manufacture
If fire hydrant design is simplified to reduce weight and part count, then ease of manufacture and maintenance improve, but reliability and regulatory compliance may deteriorate
Solution Approach 1:
The stem component is designed with multi-functionality, serving both as a structural element connecting the bonnet to the valve mechanism and as an anti-rotation element through its specific geometric features. This reduces the total part count while maintaining reliability by consolidating functions into fewer, more robust components.
Solution Approach 2:
The anti-rotation mechanism is merged into the stem-bonnet assembly rather than being a separate component. The stem's geometric features directly engage with corresponding features in the bonnet, eliminating the need for additional anti-rotation devices and simplifying the overall design while maintaining functional reliability.
3Ease of operation
If more parts and joints are added to decrease weight per part, then ease of operation improves, but device complexity and maintenance cost increase
Solution Approach 1:
The bonnet is designed with dynamic characteristics that allow it to flex and distribute loads during operation and maintenance activities. This dynamic design enables the bonnet to accommodate operational stresses without requiring additional support components, reducing overall device complexity while maintaining ease of operation.
Solution Approach 2:
The patent extracts and eliminates unnecessary parts and joints from traditional fire hydrant designs. By carefully analyzing which components are essential for safety and functionality versus those that add complexity, the design removes redundant elements while retaining the necessary features for safe and easy operation.
Data Source
AI summary
A fire hydrant barrel includes a body having at least one wall and an anti-rotation pin opening through the at least one wall. The at least one wall defines an internal cavity. The fire hydrant barrel also includes a stem extending through the cavity of the body. The stem has an anti-rotation element, and the anti-rotation pin opening and the anti-rotation element are configured to receive an anti-rotation pin to lock the stem from rotating with respect to the body.