Uni-directional Dipstick Lock with Visual Indicator
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Solution Overview
Problem
Existing dipstick assemblies lack a reliable and visible mechanism for ensuring secure engagement, leading to inconsistent fluid level measurements and potential overfilling due to multiple assembly orientations and invisible locks.
Innovation Solution
A dipstick assembly with a uni-directional lock system and visual indicator, featuring a cap and cup with specific slot and lug configurations that allow only one locked position, ensuring consistent assembly and providing a visible indication of secure engagement through a tab and recess system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lock system is added to ensure secure engagement, then reliability is improved, but device complexity increases
Solution Approach 1:
The lock system uses asymmetric tab and recess geometry where the tab can only engage the recess in one specific orientation. This asymmetric design ensures the dipstick is locked in the correct position while preventing incorrect assembly, thereby improving reliability without requiring complex locking mechanisms or additional components.
2Device complexity
If the lock position is made invisible to simplify the design, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent introduces a visual indicator as an intermediary element that communicates the lock position to the user without adding mechanical complexity to the locking mechanism itself. The indicator provides clear visual feedback about whether the dipstick is properly locked, ensuring measurement precision while keeping the lock system simple.
3Ease of operation
If multiple assembly orientations are allowed, then ease of operation is improved, but reliability deteriorates
Solution Approach 1:
The asymmetric tab-recess geometry inherently guides the dipstick into the correct orientation during assembly. The shape of the tab and recess work together to prevent incorrect orientations, ensuring that even if the user approaches from different angles, only one proper engagement position is possible. This maintains reliability while keeping operation simple.
4Reliability
If a visual indicator is added to show lock status, then reliability is improved, but device complexity increases
Solution Approach 1:
The visual indicator is merged with the existing tab structure of the lock system. Rather than being a separate component, the indicator is integrated into the tab itself, allowing it to serve dual functions: mechanical locking and visual status indication. This approach improves reliability by providing clear lock status feedback while minimizing the increase in device complexity.
Data Source
AI summary
A dipstick assembly includes a lock system. A cap has a blade, cable or extension for measuring fluid levels. The locking system has the ability to limit the assembly of a locking dipstick to one radial position. The cap has an engagement end. A cup has a receiving end. The engagement end of the cap is removably sealably disposable in the receiving end of the cup. The lock system may include a pair of slots on the cap and a pair of lugs on the cup, and a tab on the cap and a shoulder/recess on the cup that cooperate to limit the system to one way assembly. The tab and recess also provide a visible lock indicator to confirm that the slots and lugs, which are not visible, are fully engaged and locked.