Angle adjusting device and seat having the same
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Solution Overview
Problem
Conventional seat angle adjusting devices have low precision and require increased complexity and cost to achieve higher adjustment precision, limiting their effectiveness in applications where precise angle adjustments are necessary.
Innovation Solution
An angle adjusting device with a ratchet and multiple sliders, where the sliders form distinct slider groups with angular deflections, allowing for stepless adjustment by engaging and disengaging teeth in various phases, utilizing an expansion and retraction mechanism with wedges and elastic members for locking and unlocking, enabling precise control of the seat angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple slider groups with phase differences are provided to improve adjustment precision, then the adjustment precision is improved, but the device complexity and cost increase
Solution Approach 1:
The device segments the adjustment mechanism into multiple slider groups (first, second, and third slider groups) with different phase differences relative to the ratchet teeth. Each slider group can independently engage with the ratchet at different phases, allowing fine-grained control of the adjustment precision without requiring an excessive number of sliders. This segmentation enables high-precision adjustment while maintaining manageable device complexity.
2Measurement precision
If the number of sliders is increased to achieve higher adjustment precision, then the adjustment precision is improved, but the weight and cost of the device increase
Solution Approach 1:
Different slider groups are assigned different phase differences (e.g., 0°, 60°, 120°) relative to the ratchet teeth, creating local quality variations in the engagement characteristics. This allows the system to achieve high adjustment precision through the strategic distribution of sliders at different phases rather than simply increasing the total number of sliders uniformly, thereby reducing the overall weight while maintaining precision.
3Device complexity
If all sliders remain in the same phase for simple structure, then the device complexity is reduced, but the adjustment precision is limited to pitch units
Solution Approach 1:
The system transitions from a static configuration where all sliders remain in the same phase to a dynamic configuration where multiple slider groups can engage the ratchet at different phases. The phase differences between slider groups (e.g., 60° or 120° offsets) enable the mechanism to achieve stepless or near-stepless adjustment precision by selectively engaging different slider groups, thereby overcoming the pitch-unit limitation while maintaining reasonable device complexity.
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 device achieves high-precision, stepless angle adjustment by allowing the outer teeth of different sliders to engage with the inner teeth at various phases, securing the ratchet and enabling precise control of the seat angle, thereby improving user comfort and functionality.
Implementation Method 1
multiple elastic members arranged between the sliding groove plate and the multiple wedges respectively, for pushing the multiple sliders to extend in the radial directions
Implementation Method 2
multiple wedges arranged radially between the flange and the corresponding sliders respectively
Data Source
AI summary
An angle adjusting device is provided, which includes a ratchet, multiple sliders, an expansion and retraction mechanism, and a sliding groove plate. The ratchet is provided with n inner teeth; and m slider groups consisting of the multiple sliders include one base slider group and m−1 deflecting slider groups, where the outer teeth of the deflecting slider groups have an angular deflection about a central shaft of the ratchet with respect to the outer teeth of the base slider group, and the angular deflection is (Z+k/m)360/n degrees, and 1≤k≤m−1, and the expansion and retraction mechanism is capable of simultaneously push the multiple sliders to extend in radial directions. The outer teeth of different sliders can simultaneously abut against or be engaged with the inner teeth at different phases, thus achieving the stable securing and stepless adjusting of the ratchet position.