Spring-Loaded Harness Compensator for Child Safety Seats
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Solution Overview
Problem
Existing child safety seats for vehicles face challenges in maintaining optimal harness tension, which is crucial for safety and comfort, as harnesses that are too loose fail to restrain and those that are too tight are uncomfortable, making it difficult to ensure consistent tension throughout a journey.
Innovation Solution
A child safety seat with a harness that utilizes a spring-loaded spool and ratchet mechanism to maintain predetermined tension, featuring adjustable teeth and stopper elements, along with optical and audible indicators, to ensure the harness remains optimally tightened and adjusted automatically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the harness is tightened to ensure safety, then the restraining function is improved, but the passenger comfort deteriorates due to excessive tension
Solution Approach 1:
The patent applies parameter changes by using a spring-loaded compensator mechanism that dynamically adjusts the harness tension. The spring constant and pre-load force are carefully selected to maintain tension within an optimal range that ensures safety while preventing excessive tightness that would cause discomfort. This allows the system to automatically adapt the tension parameter to balance safety and comfort.
Solution Approach 2:
The compensator mechanism with spring and ratchet-pawl assembly provides self-service by automatically maintaining appropriate harness tension without requiring continuous manual adjustment. The spring-loaded system self-regulates the tension force, and the ratchet-pawl mechanism prevents over-tightening, thereby maintaining both safety and comfort autonomously throughout the journey.
2Ease of operation
If the harness is loosened to improve comfort, then the passenger comfort is improved, but the safety function deteriorates due to insufficient tension
Solution Approach 1:
The spring-loaded compensator maintains the harness tension parameter within a safe range even when the passenger moves or adjusts their position. The spring force continuously compensates for loosening, ensuring the tension never drops below the safety threshold while still allowing comfortable movement.
Solution Approach 2:
The ratchet-pawl mechanism provides mechanical feedback that prevents the harness from becoming too loose. When tension drops below the spring's pre-load force, the ratchet engages to prevent further loosening, thereby providing automatic feedback control that maintains safety while allowing comfortable adjustment within limits.
3Adaptability or versatility
If manual adjustment of the harness is allowed, then the adaptability to passenger movement is improved, but the consistent tension maintenance deteriorates due to potential loosening
Solution Approach 1:
The compensator mechanism serves itself by automatically compensating for any harness loosening that occurs during passenger movement. The spring-loaded system continuously monitors and maintains tension, and the ratchet-pawl mechanism automatically engages to prevent excessive loosening, thereby self-correcting any tension inconsistencies without manual intervention.
Solution Approach 2:
The spring-loaded compensator provides continuous tension maintenance throughout the journey, ensuring the harness remains consistently tight even as the passenger moves. The mechanical spring continuously exerts force to maintain tension, and the ratchet-pawl mechanism continuously prevents loosening, providing uninterrupted useful action for tension stability.
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 solution ensures the harness is always at the optimal tension, preventing looseness during movement while allowing for comfortable adjustment, thus enhancing safety and comfort by automatically re-tightening as needed.
Implementation Method 1
A child safety seat with a harness that utilizes a spring-loaded spool and ratchet mechanism to maintain predetermined tension
Implementation Method 2
A child safety seat with a harness that utilizes a spring-loaded spool and ratchet mechanism to maintain predetermined tension
Data Source
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AI summary
The object to provide a child safety seat for a vehicle with a harness that can be tightened and clamped at a predetermined tension is solved by the child safety seat for a vehicle according to the invention with a harness for restraining a passenger in said seat, whereas said harness is to be tightened and clamped at a predetermined tension when in use and at least one adjuster strap of said harness is guided through a spring loaded element enabled to maintain the predetermined tension in the at least one adjuster strap of said harness and whereas that adjuster strap runs then through a clamping device to avoid slip.