Convertible Ladder Joint Heads for Half-Step Alignment
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Solution Overview
Problem
Existing convertible ladder joints fail to ensure user safety by not adequately compensating for uneven surfaces and maintaining proper vertical positioning during double laddering, as they lack precise adjustment mechanisms and may not prevent disengagement during extension.
Innovation Solution
The introduction of joint heads with specific shapes and studs that allow for offset adjustments at half-step intervals, ensuring precise alignment and preventing plane spacing unless opposite rungs or studs are aligned, along with hooks that engage rungs for stability and limit deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional joint heads are used, then the ladder can be deployed in double position, but the offset adjustment is limited to full step intervals, reducing positioning precision on uneven surfaces
Solution Approach 1:
The joint head structure is segmented into multiple functional elements: external shapes for rung engagement, studs for half-step positioning, and lips for guidance. This segmentation allows each element to perform a specific function, achieving half-step adjustment precision without overwhelming complexity
Solution Approach 2:
Studs are introduced as intermediary elements between the rungs and the joint head body. These studs protrude from the inner face and can be housed in the shape provided on the plan, enabling half-step offset adjustments by providing intermediate positioning points between full rung intervals
2Ease of operation
If the ladder allows free sliding between planes, then ease of operation is improved, but safety is compromised due to potential disengagement
Solution Approach 1:
Hooks with folded locks are provided as preliminary protective measures against disengagement. The folded lock prevents disengagement by mechanically blocking the separation path, while the hook engages the rung to maintain connection. This preliminary anti-action ensures safety while allowing controlled sliding motion
Solution Approach 2:
The joint head structure incorporates dynamic elements that allow controlled movement: lips guide the sliding motion between planes, while hooks provide conditional engagement that transitions from locked to unlocked states. This dynamic design enables ease of operation during intended use while maintaining reliability through controlled engagement mechanisms
3Reliability
If hooks are added to prevent disengagement, then safety is improved, but the device complexity increases
Solution Approach 1:
The hook and folded lock are merged into a single integrated component rather than separate parts. The hook engages the rung while the folded lock provides the prevention mechanism, combining multiple safety functions into one element. This merging reduces overall complexity while maintaining the reliability benefits of disengagement prevention
Data Source
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AI summary
The head has outer shapes (15, 16) carried by flanges (7, 8) permitting engagement of one of ladder rungs (4) or one of posts (5, 5`) between cutting edges (13, 13`) of the head for spacing of planes (1, 2). The post is situated in a middle of the rung on an inner surface of columns (17, 18) of the plane (1). Return supports on the columns of the plane (2) in a manner to rigidify the transformable ladder into painter`s ladder.