Foldable Headrest Locking Mechanism for Visibility and Cargo Space
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional headrest designs in vehicles compromise rear seat occupants' visibility and cargo space, are prone to looseness and poor assembly quality, and struggle to meet safety standards due to their rigidity requirements, especially in foldable designs.
Innovation Solution
A folding headrest assembly that rotates up to 150 degrees and includes a locking mechanism with a groove for secure positioning, allowing for easy folding against the seat back for compact storage, featuring a manual release handle and a dump spring for safe deployment, and enhanced structural rigidity with optional cross support tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional headrest is designed to be rigid and robust to meet safety standards, then safety compliance is improved, but the headrest occupies more space and reduces cargo capacity
Solution Approach 1:
The headrest is designed to be movable rather than fixed, allowing it to rotate between an upright position (for safety and comfort) and a folded position (for cargo space). The dynamic mechanism includes a pivot point at the top of the seat back and a locking system that secures the headrest in the upright position during normal use, while allowing controlled folding when needed.
2Area of stationary object
If a foldable headrest mechanism is designed to fold to a sufficient degree, then visibility and cargo space are improved, but the locking/unlocking mechanism becomes awkward and complicated
Solution Approach 1:
The locking mechanism is designed to automatically engage and disengage based on the headrest's position. A spring-loaded latch automatically locks the headrest in the upright position when it is raised, and automatically releases when the headrest is folded down, eliminating the need for manual locking/unlocking operations by the user.
Solution Approach 2:
A cam mechanism acts as an intermediary between the headrest position and the locking lever. As the headrest rotates, the cam profile automatically pushes the locking lever into or out of the engagement position, translating the folding motion into automatic locking/unlocking without requiring direct user manipulation of the lock itself.
3Ease of operation
If a foldable headrest is designed with automatic locking, then ease of operation is improved, but the mechanism may become less reliable and robust
Solution Approach 1:
A cam mechanism with a carefully designed curved profile automatically engages and disengages the locking lever based on the headrest's angular position. The cam's geometry ensures positive engagement in the upright position and automatic release in the folded position, providing reliable automatic locking without complex controls.
Solution Approach 2:
A spring-loaded latch provides pre-tension to the locking mechanism, ensuring the headrest is firmly secured in the upright position before any folding attempt. The spring maintains constant pressure on the locking lever, preventing inadvertent deployment while still allowing controlled folding when force is applied.
4Strength
If a headrest is designed as a fixed extension, then structural rigidity is improved, but it presents an obstacle to viewing and reduces available cargo space
Solution Approach 1:
The headrest is designed to be movable rather than fixed, allowing it to rotate between an upright position (for safety and comfort) and a folded position (for cargo space). The dynamic mechanism includes a pivot point at the top of the seat back and a locking system that secures the headrest in the upright position during normal use, while allowing controlled folding when needed.
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
Improves occupant visibility and cargo space while ensuring robustness to meet safety standards, reducing the risk of inadvertent deployment and enhancing the perceived quality of the headrest assembly.
Implementation Method 1
When the locking lever is disengaged from the groove by manipulating the release handle in a downward motion, a dump spring allows the headrest portion to assume a folded or dumped position.
Data Source
AI summary
A foldable seat headrest assembly including a locking mechanism that includes a lock lever that can be manipulated by a manual release handle that selectively locks the headrest pad component against a groove formed in a portion of a lock post so as to keep the headrest assembly in an upright position. The groove provides both a back stop and a forward stop for the lock lever. When the lock lever is disengaged from the groove by manipulating the release handle in a downward motion, a dump spring allows the headrest portion to assume a folded or dumped position. In the folded or dumped position, the headrest portion fits compactly against the back portion of the seat. The manual release handle can be associated with either the left or the right side of the headrest assembly allowing the same assembly to be used on either side of a vehicle, e.g., the driver or passenger side of the vehicle, as well in the front and rear seats.