Distance Measuring Wheel Link Mechanism
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Solution Overview
Problem
Conventional distance measuring wheels face issues with interference between brake and initialization devices, and cable wear, which affects their reliability and operation.
Innovation Solution
A foldable distance measuring wheel design replaces cables with links to separate the initialization and braking mechanisms, allowing independent operation and reducing wear, with buttons for each function located on opposite sides of the handle case for easy one-handed use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cables are used in brake device and initialization device, then the devices can be compact, but the cables are easily worn out reducing reliability
Solution Approach 1:
The patent replaces the cable-based mechanical transmission system with a link-based mechanical transmission system. The links (first links for initialization, second links for braking) are rigid rod structures that transmit force through pivotal connections, eliminating the flexible cables that were prone to wear and failure. This substitution significantly improves reliability and service life while maintaining the compact structure.
2Ease of operation
If brake device and initialization device are located on two sides of the frame, then they can operate independently, but they easily affect each other
Solution Approach 1:
The patent segments the control mechanisms into distinct spatial zones by placing the initialization device and brake device on opposite sides of the handle case. The first button and its associated first links are positioned on one side, while the second button and second links are positioned on the other side. This spatial segmentation prevents operational interference while maintaining independent controllability of each function.
3Ease of operation
If buttons are located on opposite sides of handle case, then one-handed operation is enabled, but device complexity increases
Solution Approach 1:
The patent merges the functional requirements of one-handed operation with the overall handle assembly design. The first button and second button are integrated into the handle case structure itself, with the buttons, links, and resilient members working together as a unified mechanical system. This merging approach enables one-handed operation without adding separate complex control mechanisms.
Data Source
AI summary
A distance measuring wheel includes a housing, two folding devices, an initialization device, a wheel, an initialization unit and a braking unit. The initialization unit includes first links which drives the swift plate of the initialization device. The braking unit includes second links which drives the brake pads of the initialization device such that the initialization and barking are independently operated and do not affect each other.