Trailer Hitch Safety Locking Mechanism
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Solution Overview
Problem
Existing trailer hitch systems lack reliable mechanisms to ensure correct coupling with the towball, often allowing incorrect operation and potential malfunctions, especially for inexperienced users, and are vulnerable to environmental influences and manipulation.
Innovation Solution
A locking device integrated with the operating lever that acts as an engagement indicator, preventing the lever from closing unless the trailer hitch is correctly coupled, featuring a spring-loaded mechanism and tactile trigger for secure operation, and can be combined with a lock and wear indicator for enhanced safety and usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate display pin locking device is used to indicate correct latching position, then the locking position can be indicated, but the operating lever can still be closed incorrectly without user awareness
Solution Approach 1:
The patent combines the locking device and operating lever into a single integrated unit. The operating lever itself serves as the locking indicator through its position-dependent accessibility. When the trailer hitch is correctly coupled, the operating lever can be moved to the closed position; when incorrectly coupled, the lever remains blocked. This merging eliminates the need for separate display pins while providing both indication and control functions through one component.
Solution Approach 2:
The operating lever automatically indicates the locking status through its own position and accessibility. The system uses the lever's mechanical state to provide feedback to the operator without requiring separate indication mechanisms. The lever's ability to be moved or blocked serves as the indicator itself, making the system self-explanatory and eliminating the need for additional display components.
2Ease of operation
If the operating lever is made independent of the engagement indicator, then the lever can be operated freely, but incorrect coupling goes undetected
Solution Approach 1:
The patent implements direct feedback between the coupling state and the operating lever's accessibility. The mechanical coupling status automatically controls whether the lever can be moved to the closed position. When the trailer hitch is correctly positioned on the ball head, the lever becomes accessible; when mispositioned, the lever remains blocked. This feedback mechanism ensures that only correct coupling allows lever operation, preventing undetected incorrect coupling.
3Reliability
If a blocking device is added to prevent lever movement in incorrect positions, then operational safety is improved, but the device complexity increases
Solution Approach 1:
The blocking function is merged into the operating lever assembly itself rather than being a separate component. The lever's mounting structure and connection to the locking mechanism inherently provide the blocking capability. When the trailer hitch is incorrectly coupled, the mechanical geometry prevents the lever from reaching the closed position. This integration avoids adding separate blocking devices while maintaining safety functionality.
4Reliability
If the locking device is made robust against environmental influences and manipulation, then security is improved, but the ease of legitimate operation may be reduced
Solution Approach 1:
The patent applies different mechanical characteristics to different parts of the operating lever system. The lever itself remains lightweight and easy to move for legitimate operation. The blocking mechanism uses precise geometric constraints and spring-loaded detents that are robust against manipulation but only engage at specific positions. The trigger mechanism requires deliberate action (pushing past the detent) but only when the lever is in the correct position, allowing easy legitimate operation while preventing manipulation.
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 solution provides unmistakable feedback on correct coupling, prevents operational errors, and ensures secure attachment, even under environmental stress, while being adaptable to various trailer hitch designs and easy to retrofit, offering improved safety and reliability with minimal additional cost.
Implementation Method 1
The trailer hitch has a locking device with a blocking device acting on the operating organ... The operating element itself can act as a latching indicator... The locking device can also facilitate the actuation of the operating element due to its spring loading
Data Source
Figure 1~2
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AI summary
The coupling has an operating lever (9) and a locking protection (7) for correct locking positioning of the coupling on a ball-shaped head. The protection has a locking device (23) with a release arranged in an accommodation opening and operated by the head during correct positioning of the coupling, where the locking device closes or releases a closing position of the lever based on the correct locking position.