Foldable Crank-Handle Assembly With Locking Pivot Strength
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Solution Overview
Problem
Crank-handle assemblies for hose reels face challenges in being both foldable to save storage space and structurally strong enough to withstand various forces and torques, as existing solutions often compromise on strength for foldability.
Innovation Solution
A crank-handle assembly design featuring a handle that pivots between operational and folded positions, with a locking mechanism using a button and spring to maintain the operational position during use and easily switch to a folded configuration, ensuring compact storage and ergonomic design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the crank-handle is made foldable to save storage space, then the storage volume is reduced, but the strength and structural integrity are compromised
Solution Approach 1:
The crank-handle assembly is divided into distinct segments: a fixed arm portion and a movable handle portion connected by a pivot joint. This segmentation allows the handle to fold for compact storage while maintaining structural integrity during operation, as each segment can be optimized for its specific function.
Solution Approach 2:
The crank-handle employs a dynamic locking mechanism that transitions between locked and unlocked states. During operation, the locking mechanism engages to provide rigid structural support and maximize strength. During storage, the mechanism allows the handle to pivot to a folded position, reducing storage volume without compromising operational strength.
2Ease of operation
If the crank-handle is made foldable, then the ease of storage is improved, but the reliability of force transmission is worsened
Solution Approach 1:
The locking mechanism is designed to automatically engage before the crank-handle is put into use, preparing the structure for reliable force transmission. The spring-loaded button mechanism ensures the handle is securely locked in the operational position before any cranking action occurs, preventing force transmission issues during operation.
Solution Approach 2:
The pivot joint acts as an intermediary element between the fixed arm and movable handle, allowing controlled movement during folding while maintaining rigid force transmission during operation. This intermediary component enables the dual functionality of easy storage and reliable force transmission by mediating between the two opposing requirements.
3Adaptability or versatility
If the handle is made pivotable between positions, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is merged with the pivot joint structure, combining the positioning and locking functions into a single integrated component. The button mechanism is integrated into the arm structure, and the spring is incorporated within the existing components, reducing overall device complexity despite the added positional adaptability.
Solution Approach 2:
The pivot joint with locking mechanism serves multiple functions: it enables folding for storage, provides a locked operational position for force transmission, and allows easy transition between states. This multi-functionality reduces the need for separate components, thereby managing device complexity while maximizing adaptability.
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 design provides a compact, structurally strong crank-handle assembly that efficiently distributes forces and torques, allowing for easy switching between operational and storage positions while maintaining stability and ergonomic advantages.
Implementation Method 1
A spring is provided which biases the button
Implementation Method 2
A spring is provided which biases the button
Data Source
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AI summary
A crank-handle assembly (100) includes an arm (102) having a first end (104) and a second end (106). An axle (108) is fixedly coupled to the first end (104) of the arm (102) along a first axis X-X'. The first axis X-X' is angularly oriented to the arm (102) and parallel to the axle (108). A handle (110) is pivotally coupled to the arm (102) at the second end (106). The crank-handle assembly (100) is characterized in that the handle (110) is adapted to pivot between an operational position and a folding position. The handle (110) is parallel to the first axis X-X' in the operational position. The handle (110) is parallel to the arm (102), and folded on a side of the arm (102), in the folded position.