Drawbar Coupler Visual Inspection Mechanism
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Solution Overview
Problem
Existing vehicle couplers require partial disassembly to verify towing components post-collision, lacking a visual confirmation method for critical parts like the stop or key, which complicates the towing process.
Innovation Solution
A drawbar coupler design with a releasable connection and a secondary emergency release mechanism, featuring a block and groove system with visible key inserts, allowing for sliding motion during collisions and towing while ensuring no disassembly is needed to confirm the presence of the stop or key.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a releasable connection with internal stop or key is used in the drawbar coupler, then the towing function is enabled, but the ability to visually confirm the presence of the stop or key without disassembly is lost
Solution Approach 1:
The stop or key is nested within the drawbar body structure, specifically positioned within a recess or cavity that is accessible from the exterior. This nesting allows the component to be internally secured while maintaining external visibility and accessibility for inspection purposes, eliminating the need for disassembly to confirm presence.
Solution Approach 2:
An intermediary structure such as a visible indicator, marker, or accessible exterior feature is introduced that mediates between the internal stop or key and the external inspector. This intermediary provides visual confirmation of the stop or key's presence without requiring direct access to or disassembly of the internal components.
2Adaptability or versatility
If the drawbar components are designed for sliding motion during collision and towing, then the coupler can absorb forces and permit towing, but the risk of components separating and dropping onto the roadbed increases
Solution Approach 1:
The drawbar is designed with predefined sliding paths, grooves, or guides that anticipate and accommodate the expected sliding motion during collisions and towing operations. These pre-planned movement paths ensure components slide in controlled, predictable directions rather than separating uncontrollably, thereby maintaining reliability while enabling adaptability.
Solution Approach 2:
The potential harm of component separation during sliding motion is converted into a benefit by designing the sliding mechanism to actively retain components. For example, the sliding action itself engages positive locking features, friction surfaces, or geometric constraints that ensure components remain attached to the drawbar even during and after the sliding motion, thus converting the motion that could cause separation into a mechanism that prevents it.
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
Enables safe and efficient towing of damaged vehicles by allowing visual inspection to confirm the presence of the stop or key without disassembly, ensuring secure load transfer and minimizing the risk of dropped components during towing.
Implementation Method 1
a rigid drawbar connected with a dampening device, such as a draft gear, for absorbing normal tension (draft) and compression (buff) forces
Data Source
AI summary
A drawbar for a vehicle coupler includes a drawbar tail, the drawbar tail configured at a distal end for connecting to a vehicle, and at a proximal end for engagement with a drawbar body; a drawbar body, the drawbar body configured for receiving a draft gear, the drawbar body further defining a path for movement of the proximal end of the drawbar tail. The drawbar body and drawbar tail are connected by a releasable connection. A block inserted via an opening in the drawbar body blocks the path to restrain movement of the drawbar tail during towing, after release of the releasable connection.