Child Seat Headrest Limits Switched by Support Leg Position
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Solution Overview
Problem
Conventional child safety seats often have adjustable headrests that can be improperly set by parents, failing to provide adequate protection for children of different ages, as the height adjustment range is not effectively limited, leading to either the headrest being too high for infants or too low for older children.
Innovation Solution
A child safety seat with a pivotable support leg and a headrest limiting device featuring first and second locking members, which are engaged by elastic restoring members and pulling ropes to set upper and lower adjustment limits for the headrest, ensuring it is adjusted within safe ranges for infants and older children.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the headrest height adjustment range is made large to accommodate children of different heights, then the adaptability is improved, but the risk of improper adjustment increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the headrest height adjustment range based on the support leg state. When the support leg is unfolded (infant mode), the upper adjustment limit is reduced to a safer height. When the support leg is folded (older child mode), the lower adjustment limit is increased. This resolves the contradiction by changing the adjustment range parameters according to the intended use scenario.
Solution Approach 2:
The patent implements dynamics by making the headrest adjustment limits conditional on the support leg state. The locking members are positioned at different heights corresponding to different support leg configurations, allowing the system to adaptively change its constraints based on whether the seat is configured for infants or older children.
2Reliability
If the headrest adjustment range is limited to ensure proper protection, then the safety is improved, but the adaptability to different child heights is reduced
Solution Approach 1:
The patent applies segmentation by dividing the headrest adjustment range into distinct segments based on the support leg state. The first locking member creates an upper limit segment for infant mode, while the second locking member creates a lower limit segment for older child mode. This segmentation allows the system to provide appropriate protection for each age group while maintaining overall adaptability.
Solution Approach 2:
The patent implements universality by designing a single headrest adjustment mechanism that serves multiple functions through the locking members. The same headrest can be adjusted to different height ranges depending on which locking member is engaged, allowing one structure to provide proper protection for both infants and older children.
3Ease of operation
If the headrest is adjusted to a high position for older children, then the comfort is improved, but the safety for infants is compromised
Solution Approach 1:
The patent applies preliminary anti-action by pre-positioning the first locking member to prevent the headrest from being adjusted too high when the support leg is unfolded for infant use. This preventive measure stops the harmful configuration before it can occur, ensuring infant safety while still allowing comfortable adjustment within the safe range.
4Reliability
If the headrest is adjusted to a low position for infants, then the safety is improved, but the comfort for older children is reduced
Solution Approach 1:
The patent implements dynamics by enabling the headrest adjustment range to change based on the support leg state. When transitioning from infant mode to older child mode (by folding the support leg), the second locking member becomes active, allowing the headrest to be adjusted to higher positions that provide comfort for older children while maintaining the safety benefits for infants.
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 effectively limits the headrest adjustment to prevent improper use, enhancing safety and comfort by ensuring the headrest is neither too high for infants nor too low for older children, thus providing appropriate protection across various child heights.
Implementation Method 1
a first elastic restoring member mounted on the backrest and connected to the first locking member... when the support leg is in the folded state, the first elastic restoring member is subjected to a force from the first pulling rope and deformed, so that the first locking member is switched from the extended state to the retracted state
Data Source
AI summary
A child safety seat includes: a base provided with a pivotable support leg; a seat having a backrest, the backrest being provided with a height-adjustable headrest; a headrest limiting device operably connected to the support leg and including a first locking member, when the support leg is in an unfolded state, the first locking member is in an extended state, so that the first locking member is capable of being engaged with the headrest, thereby limiting an upper adjustment height of the headrest, and when the support leg is in a folded state, the first locking member is in a retracted state; or a second locking member, when the support leg is in the unfolded state, the second locking member is in a retracted, and when the support leg is in the folded state, the second locking member is in an extended state, so that the second locking member is capable of being engaged with the headrest, thereby limiting a lower adjustment height of the headrest.