Pass-Through Ratcheting Strap Assembly for HMD Weight Balance
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Solution Overview
Problem
Conventional head-mounted display (HMD) devices cause discomfort due to their weight distribution, as internal electrical components such as batteries are typically located at the front, leading to an uneven weight distribution on the head.
Innovation Solution
An adjustable strap system with a pass-through ratcheting mechanism that allows internal electrical components to be positioned closer to the back of the head, utilizing a rack and pinion system and a ratcheting dial for adjusting strap tension, enabling better weight distribution and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If internal electrical components are positioned at the front of the head, then the HMD device structure is simplified, but the weight distribution becomes uneven causing discomfort
Solution Approach 1:
The HMD device is divided into separate functional modules: the front portion contains the display and optical components, while the battery and electrical components are segmented and positioned in the rear portion. This segmentation allows independent placement of heavy components away from the user's face, improving weight distribution without complicating the overall device structure.
Solution Approach 2:
Instead of positioning components only in the front horizontal plane, the patent utilizes the longitudinal dimension of the head by placing the battery and electrical components in the rear portion. This dimensional redistribution of mass along the head's length achieves better balance and comfort while maintaining structural simplicity.
2Ease of manufacture
If a conventional strap system is used, then the HMD device is easier to manufacture, but the strap tension cannot be effectively adjusted or maintained
Solution Approach 1:
The strap system incorporates a dynamic adjustment mechanism with a dial and ratchet teeth that allow the strap tension to be adjusted and locked at various positions. This dynamic system enables users to customize the fit while maintaining the simplicity of a strap-based construction, combining ease of manufacture with operational flexibility.
Solution Approach 2:
A ratchet mechanism acts as an intermediary between the simple strap and the user's adjustment needs. The ratchet teeth and dial work together to translate rotational motion into linear strap tension, providing effective adjustment and maintenance of tension without requiring complex manufacturing.
3Reliability
If a ratcheting mechanism is added to the strap system, then the strap tension can be maintained, but the device complexity increases
Solution Approach 1:
The ratcheting mechanism is extracted as a separate, modular component integrated into the rear portion of the HMD device. This isolated placement of the tension-maintenance function allows it to work independently without complicating the main device structure, achieving reliability through functional separation.
Solution Approach 2:
The ratchet mechanism provides self-locking functionality where the engaged ratchet teeth automatically maintain strap tension without requiring active control or additional power. This passive, self-service mechanism ensures reliable tension maintenance while adding minimal structural 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 adjustable strap system improves the comfort and weight distribution of HMD devices by allowing internal components to be positioned closer to the back of the head, reducing the forward weight and enhancing user experience.
Implementation Method 1
a pinion member affixed to a proximal end of the shaft and adapted to (a) engage the first rack member and the second rack member and (b) translate the first rack member and the second rack member in opposite directions via rotation of the shaft
Implementation Method 2
a ratcheting member coupled to a distal end of the shaft and having one or more pawls adapted to prevent rotation of the shaft when engaged
Data Source
AI summary
The disclosed adjustable strap apparatus may include a left strap having a first rack member and a right strap having a second rack member. An electrical unit may have an opening through which a shaft passes. A pinion member may be affixed to a proximal end of the shaft and may be adapted to (a) engage the first rack member and the second rack member and (b) translate the first rack member and the second rack member in opposite directions via rotation of the shaft. A ratcheting member may be coupled to a distal end of the shaft and may include one or more pawls adapted to prevent rotation of the shaft when engaged. Various other methods, systems, and devices are also disclosed.