Child Seat Headrest Height Adjustment Gear Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing child safety seats have height-adjustable headrests that can only be fixed in distinctly predetermined positions, lacking continuous adjustment capability within the adjustment range.
Innovation Solution
A child seat design featuring a gear wheel with peripheral teeth on the headrest part and longitudinal toothing on the backrest part, along with a blocking element, allows for quasi-continuous height adjustment of the headrest by enabling it to be fixed in any desired position through the engagement and disengagement of the blocking element with the gear wheel's toothing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bolt-receptacle pairs are used for height adjustment, then the headrest can be fixed in predetermined positions, but the adjustment range is limited to distinct positions only
Solution Approach 1:
A gear wheel is introduced as an intermediary mechanism between the blocking element and the longitudinal guide. The gear wheel converts the linear movement of the blocking element into rotational movement, which then translates into continuous height adjustment through engagement with the longitudinal toothing, enabling quasi-continuous adjustment positions.
Solution Approach 2:
The mechanism changes the adjustment parameter from discrete bolt-receptacle engagements to continuous gear tooth engagements. By varying the number of teeth on the gear wheel and the spacing of the longitudinal toothing, the system achieves fine-grained continuous adjustment while maintaining secure locking at any position.
2Adaptability or versatility
If a gear wheel with peripheral teeth and longitudinal toothing is used, then continuous height adjustment is enabled, but the device complexity increases
Solution Approach 1:
The gear wheel serves multiple functions simultaneously: it acts as a locking mechanism when engaged by the blocking element, provides continuous adjustment through engagement with the longitudinal toothing, and translates linear motion into rotational motion. This multi-functionality reduces the need for separate mechanisms for each function.
Solution Approach 2:
The gear mechanism is designed to be self-locking through the engagement of teeth, eliminating the need for additional locking components. The blocking element simply needs to engage the gear wheel's peripheral teeth to secure the position, while the gear's own structure provides the locking action.
3Ease of operation
If the blocking element is disengaged from the gear wheel, then the headrest part can be displaced longitudinally, but the headrest cannot be fixed in position
Solution Approach 1:
The blocking element is preliminarily positioned to engage the peripheral teeth of the gear wheel, preventing unintended movement or rotation. This preliminary engagement ensures that the headrest remains securely fixed in the adjusted position without requiring additional locking mechanisms.
Solution Approach 2:
The gear wheel is preliminarily positioned and engaged with the longitudinal toothing before the blocking element is activated. This preliminary engagement establishes the desired height position, and the subsequent blocking action simply maintains this pre-established position securely.
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 precise and continuous adjustment of the headrest's height relative to the backrest, providing a larger range of adjustable positions and ensuring the headrest is securely locked in place for safety.
Implementation Method 1
at least one gear wheel (7) having peripheral teeth (9) is rotatably fixed on the headrest part (3) and that furthermore on the backrest part (2) at least one longitudinal toothing (13) is formed in the area of the longitudinal guide, extending along the longitudinal direction, in which the gear wheel (7) meshes with its peripheral teeth (9)
Implementation Method 2
at least one blocking element (10), which has external teeth (12) corresponding to the peripheral teeth (9), is arranged on the headrest part (3), is displaceable between a blocking position in which the external toothing (12) with the peripheral toothing (9) is in engagement and a release position in which the external toothing (12) is not in engagement with the peripheral toothing (9)
Data Source
Figure 1~3
Figure 2
Figure 4
AI summary
A child seat is disclosed, comprising a seat surface section, a backrest section, and a headrest section (3) with a headrest (4), which is connected to the backrest section in a position adjustable relative to the backrest section. A longitudinal guide is formed between the backrest section and the headrest section (3) for longitudinal height adjustment of the headrest section (3) with its headrest (4). At least one gear (7) having circumferential teeth (9) is rotatably mounted on a first of the headrest section (3) and backrest section. On the second of the headrest section (3) and backrest section, at least one longitudinal tooth extending along the longitudinal direction is formed in the area of the longitudinal guide, in which the gear (7) with its circumferential teeth (9) meshes.At least one locking element (10) having external teeth corresponding to the circumferential teeth (9) is arranged on the first of the parts, headrest part (3) and backrest part. The locking element (10) can be moved by means of an actuating element (6) between a locking position, in which its external teeth engage with the circumferential teeth (9) of the gear (7) and thus prevent rotation of the gear (7), and a release position, in which the external teeth do not engage with the circumferential teeth (9) of the gear (7) and thus allow rotation of the gear (7). This design allows the height of the headrest part (3) relative to the seat surface to be adjusted to almost any position within an adjustment range.