LATCH Anchor Coupling with Fail-Safe Pawl Locking
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Solution Overview
Problem
Existing child car seat LATCH system couplings are inadequate for securing higher weight children, as they lack structural integrity, are difficult to use, and pose safety risks due to spring failure, which can lead to disconnection from the vehicle seat.
Innovation Solution
A novel coupling design featuring a rotatable pawl with multiple pawl members, a spring-biased carriage, and a fail-safe mechanism that maintains locking even if springs fail, allowing secure attachment and detachment of child car seats to LATCH loops, accommodating loads up to 80 pounds or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring-biased pawl mechanism is used to enable easy attachment and detachment of child car seats, then ease of operation is improved, but reliability deteriorates because spring failure can lead to disconnection from the vehicle seat
Solution Approach 1:
The patent incorporates a fail-safe mechanism that compensates for potential spring failure before it occurs. The design includes features such as redundant locking elements or alternative retention methods that ensure the child car seat remains securely attached even if the spring-biased pawl mechanism fails, thus cushioning against the harmful effect of spring failure on reliability
Solution Approach 2:
The patent modifies the operational parameters of the pawl mechanism by changing the direction in which the release button operates. Instead of requiring upward pressure, the button now operates with downward pressure, which improves ease of operation while maintaining reliability through the fail-safe design that prevents accidental disengagement
2Ease of operation
If the pawl is designed to rotate freely for easy engagement, then ease of operation is improved, but strength deteriorates because the single-piece steel construction lacks structural integrity for higher weight loads
Solution Approach 1:
The patent transitions from a single-piece steel pawl to a composite construction using multiple pawl members. These members can be made from different materials optimized for specific functions, such as high-strength materials for load-bearing portions and softer materials for engagement surfaces, thereby simultaneously improving strength for higher weight loads while maintaining ease of engagement through the rotatable design
3Device complexity
If a single-piece steel pawl is used to simplify the design, then device complexity is reduced, but strength deteriorates because it cannot accommodate loads up to 80 pounds or more
Solution Approach 1:
The patent divides the single-piece steel pawl into multiple separate pawl members. This segmentation allows each member to be optimized for specific functions and enables the assembly to bear higher loads through distributed stress across multiple components, thereby increasing load capacity to accommodate 80 pounds or more while maintaining reasonable design complexity through modular construction
4Manufacturing precision
If the release button requires upward pressure to disengage the pawl, then manufacturing precision is improved, but ease of operation deteriorates because it is difficult to use
Solution Approach 1:
The patent inverts the operation direction of the release button from requiring upward pressure to requiring downward pressure. This inversion improves ease of operation by utilizing the natural strength and leverage of the user's finger, making the disengagement action more intuitive and easier to perform, while the underlying manufacturing precision requirements are maintained through the redesigned button mechanism
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 new coupling provides enhanced strength, ease of use, and safety by ensuring the child car seat remains securely attached to the vehicle seat, even if internal springs fail, and is designed to handle higher loads than previous systems.
Implementation Method 1
A spring-biased carriage is connected to the main body and is spring-biased into communication with the rear bearing surface of the pawl
Implementation Method 2
A lower impact member is connected to the main body member and is in spring-biased communication with the lower portion of the pawl thereby urging the pawl to rotate in a first direction
Data Source
AI summary
The coupling includes a main body with a fixed frame and a locking pawl. A carriage and impact member are connected in spring-biased fashion to the frame. The carriage controls locking of the pawl while the impact member continually urges the pawl in a counterclockwise direction. Pressing the release button causes the carriage to separate from the pawl permitting the impact member to rotate the pawl to permit entry and exit of a LATCH loop into locking communication with the tooth of the pawl. When the button is released, the carriage maintains the pawl open until a LATCH loop is impacted into the back of the pawl to disengage it from the carriage to lock the pawl closed. The invention includes a fail safe measure to maintain locking when any of the springs fail and the ability to accommodate loads much heavier than prior art couplings.