Head-Mounted Strap Adjustment via Rack and Pinion
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Solution Overview
Problem
Existing head-mounted electronic devices lack an efficient strap adjustment mechanism, leading to difficulties in accommodating different head circumferences, which negatively impacts user experience.
Innovation Solution
A strap adjustment apparatus featuring a strap assembly with a rack portion and a driving gear, a knob assembly with a self-locking mechanism, and an elastic reset element that allows for quick and reliable adjustment of the strap length to fit various head sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-size strap is used in head-mounted electronic devices, then the device structure is simple, but it cannot adapt to different head circumferences, affecting user experience
Solution Approach 1:
The strap transitions from a fixed-size static structure to a dynamically adjustable structure through the integration of a driving gear, rack portion, and knob assembly. The driving gear engages with the rack portion to enable continuous adjustment of the strap length, allowing the device to adapt to different head circumferences while maintaining a relatively simple overall structure.
2Ease of operation
If an adjustable strap mechanism is added to accommodate different head sizes, then adaptability improves, but the adjustment response speed becomes slow and operation becomes inconvenient
Solution Approach 1:
The traditional multi-component mechanical adjustment mechanism is replaced with a simplified gear-rack system driven by a knob. The driving gear meshing with the rack portion converts rotational motion of the knob directly into linear adjustment of the strap, providing fast response speed and convenient operation without requiring complex mechanical assemblies.
3Reliability
If a self-locking mechanism is added to the knob assembly to prevent strap slippage, then reliability improves, but the device complexity increases
Solution Approach 1:
The self-locking mechanism is designed to automatically engage and lock the strap position without requiring additional actuators or complex control systems. The mechanism itself provides the locking function through its inherent mechanical design, where the driving gear and rack portion create natural engagement points that maintain strap position reliably while keeping the overall assembly simple.
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 apparatus enables fast and convenient strap adjustments, ensuring a secure and comfortable fit for users with different head circumferences, thereby enhancing the overall user experience.
Implementation Method 1
an elastic reset element, which is mutually linked to the knob to switch between a compressed state and a reset state; wherein when moving to the release position, the knob links to the elastic reset element to compress and deform the elastic reset element to the compressed state; when the elastic reset element is restored from deformation to the reset state, the knob is linked to move to the fitting position
Implementation Method 2
a strap assembly including a strap and a driving gear, wherein the strap includes a rack portion and the driving gear is in mesh with the rack portion to actuate the strap to move through rotation of the driving gear
Implementation Method 3
the strap includes a rack portion and the driving gear is in mesh with the rack portion to actuate the strap to move through rotation of the driving gear
Data Source
AI summary
A strap adjustment apparatus of a head-mounted electronic device, and a head-mounted electronic device. The strap adjustment apparatus comprises: a strap assembly wherein the strap assembly comprises a strap and a driving gear, the strap comprises a rack portion, and the driving gear is meshed with the rack portion to drive the strap to move by means of the rotation of the driving gear; a knob assembly, wherein the knob assembly comprises a knob and a self-locking mechanism, and the self-locking mechanism cooperates with the knob to limit the rotation direction of the knob; and an elastic reset element, wherein the elastic reset element and the knob are linked to each other so as to switch between a compressed state and a reset state. Therefore, the length of the strap assembly can be adjusted, and the strap adjustment apparatus is matched with a wearer.