Vehicle Headrest Latch Mechanism with Flexible Force Transmission
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Solution Overview
Problem
Existing headrest latches are inflexible in terms of actuation site placement and movement transfer, limiting design adaptability.
Innovation Solution
A headrest latch mechanism utilizing a force-transmitting device that can transmit compression and traction forces and is partially or fully displaceable relative to the guide, allowing linear or curved movement between latching and release positions, featuring deformable elements like wires or plastic parts, and guided by surfaces for flexible adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional latch mechanism is used with the latch element directly attached to the guide structure, then the latch provides reliable locking, but the actuation site placement and movement transfer are inflexible and limited in design adaptability
Solution Approach 1:
A force-transmitting device is introduced as an intermediary component between the actuator and the latch element. This device transmits forces and movements while allowing flexible positioning of the actuation site separate from the latch engagement point, enabling independent optimization of both actuation ergonomics and locking reliability without increasing overall system complexity
Solution Approach 2:
The latch mechanism is segmented into distinct functional components: the latch element for engagement, the force-transmitting device for movement transfer, and the actuator for user input. This segmentation allows each component to be optimized independently for its specific function while maintaining overall system simplicity through modular design
2Adaptability or versatility
If the latch element is held on a rigid structure, then the latch provides stable locking, but the actuation site cannot be freely positioned or adapted to different design requirements
Solution Approach 1:
The force-transmitting device serves as a mediator that connects the movable actuator to the stationary latch element. It transmits forces reliably while allowing the actuator to be positioned at any location along its travel path, decoupling the reliability of locking from the flexibility of actuation site placement
Solution Approach 2:
The force-transmitting device is designed to be displaceable relative to the guide structure, introducing dynamic positioning capability. This allows the actuation mechanism to move along a defined path while maintaining reliable force transmission to the latch element, enabling flexible actuation site placement without compromising locking reliability
3Adaptability or versatility
If the force-transmitting device is made flexible to allow free movement, then design adaptability is improved, but the transmission of compression and traction forces becomes less reliable
Solution Approach 1:
The force-transmitting device employs a flexible element with sufficient rigidity to transmit compression and traction forces effectively. This flexible component can bend or deform to accommodate curved or complex movement paths while maintaining adequate force transmission capability through its structural design and material properties
Solution Approach 2:
The force-transmitting device's physical parameters (such as cross-sectional area, material modulus, or structural configuration) are optimized to balance flexibility and force transmission. By adjusting these parameters, the device can adapt to different movement paths while maintaining sufficient stiffness to reliably transmit both compression and traction forces from the actuator to the latch element
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 flexible design integration and automatic return to latching position, enhancing the headrest's adjustability and usability by allowing the latch to adapt to various design requirements.
Implementation Method 1
The force-transmitting device is deformed during movement between the latching position and the release position. The deformable element can be formed for example by a wire or by a plastic part.
Implementation Method 2
the deformable element has an elastic return force. By virtue of the return force, the deformable element can be supported on the guide surfaces such that it moves automatically from the release position or from the intermediate positions between the release position and the latching position into the latching position.
Data Source
AI summary
A vehicle headrest has a support rod extending along an axis formed with a plurality of radially open notches, a head support carried above the notches on the support rod, and a guide sleeve mountable in a seat back and slidably receiving the support rod. An actuation element can shift axially on the sleeve between an actuated position and an unactuated position. An elongated and longitudinally incompressible latch element has an outer end shiftable radially and engageable in the notch and an inner end engaging the actuation element and shiftable axially on the sleeve on movement of the actuation element from the actuated position to the unactuated position between a latching position with the outer end engaged radially in one of the notches and securing the rod against movement in the sleeve and a release position with the outer end clear of the notches and permitting such movement.