Tailgate Latch Camming Mechanism for Secure Cargo
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Solution Overview
Problem
Existing tailgate latching mechanisms often fail to securely keep the tailgate closed, especially when subjected to shifting loads, and can be difficult to open when pressure is applied from cargo, leading to potential accidental opening during transportation.
Innovation Solution
A tailgate latching mechanism comprising a latch and a keeper with rotatable components, where the keeper is supported by the tailgate and can pivotally move the latch from a closed to an open position through a camming surface interaction, assisted by a handle for user operation, and includes biasing devices to maintain the latch in the closed position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple latch mechanism is used, then the device complexity is reduced, but the reliability of keeping the tailgate closed under load increases
Solution Approach 1:
The latch mechanism employs dynamic elements including a rotatable member with a camming surface that interacts with the keeper, allowing the system to adapt its state between latched and unlatched positions. The spring element provides dynamic biasing force that maintains engagement under varying load conditions, enabling the simple mechanism to achieve reliable operation without complex control systems
2Reliability
If the latch is made secure against accidental opening, then the reliability improves, but the ease of operation for intentional opening deteriorates
Solution Approach 1:
The mechanism extracts the opening action from the closing action by introducing a separate rotatable member that can be independently operated. The camming surface on this rotatable member engages with the keeper to release the latch, allowing intentional opening without requiring forceful manipulation of the closing mechanism. This separation enables secure latching during transport while maintaining easy intentional opening through simple rotation of the release member
3Reliability
If the latch engages firmly under cargo pressure, then the reliability improves, but the device complexity increases
Solution Approach 1:
The mechanism employs a spring element that acts as a counterweight to the cargo pressure acting on the tailgate. The spring provides continuous biasing force that maintains engagement between the latch and keeper surfaces, compensating for the force applied by shifting loads. This simple elastic counterweight mechanism achieves reliable engagement under pressure without requiring complex active control systems or multiple actuation stages
Data Source
AI summary
An apparatus for latching a tailgate to supporting structure of a vehicle generally includes a latch, a keeper, and a member for rotating the keeper relative to the latch. The member is rotatably supported by the tailgate such that the member is rotatable between at least a first position and a second position. The latch includes a latching surface, and the keeper includes a keeper surface configured for engagement with the latching surface. The latch is pivotably coupled to the vehicle supporting structure such that the latch is pivotable between at least a closed position and an opened position. To disengage the latching surface from the keeper surface, the member is rotated from the first position towards the second position, which, in turn, causes the keeper to rotate and to pivotally move the latch from the closed position towards the opened position.