Dual-Axis Ear Muff Attachment Reducing Rotational Force
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Prior helmet-mounted ear muff devices require the same force to rotate into an active position as to rotate to a standby position, limiting the range of motion and causing excessive stress on components.
Innovation Solution
An ear muff attachment assembly with a housing, arm, and spring that rotates about two axes, allowing different forces to be required for moving the ear muff between active and standby positions, reducing the force needed to move into an active position and minimizing stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single axis of rotation is used for the ear muff assembly, then the structure is simple, but the force required to move the ear muff into the active position is excessive and the range of motion is limited
Solution Approach 1:
The rotation movement is segmented into two separate rotational movements about two different axes. The first rotation occurs about a first axis between a first position and an intermediate position, and the second rotation occurs about a second axis between the intermediate position and a second position. This segmentation allows the force requirements to be distributed and optimized for each rotational stage, reducing the excessive force needed in a single-axis system.
Solution Approach 2:
The system transitions from a single-axis rotation to a two-axis rotation system. By introducing a second axis of rotation perpendicular to the first, the system adds a dimensional aspect to the movement. This allows the ear muff to achieve the same functional positions through a different rotational path that reduces the force required, particularly when moving from the standby position to the active position.
2Ease of operation
If the range of motion is limited to avoid excessive force, then the force requirement is reduced, but the flexibility in positioning is decreased
Solution Approach 1:
The total range of motion is segmented into two separate rotational movements. The first rotation about the first axis provides a first range of motion from the first position to the intermediate position, and the second rotation about the second axis provides a second range of motion from the intermediate position to the second position. This segmentation allows each rotational stage to operate within optimized force parameters while collectively achieving a greater overall flexibility in positioning than a single-axis system with limited range.
Solution Approach 2:
By introducing a second axis of rotation, the system expands the available positioning space and flexibility. The two-axis configuration allows the ear muff to reach positions that would require excessive force in a single-axis system, thereby increasing adaptability without compromising ease of operation. The intermediate position serves as a transition point that enables this expanded range of motion.
3Stability of the object's composition
If a pre-stressed component is used to maintain the ear muff in the standby position, then the ear muff remains stable, but the force exerted by the spring component is excessive
Solution Approach 1:
The stabilizing function is segmented across two rotational axes. The spring component needs to overcome the moment only for the first rotation about the first axis, not for both rotations combined. This segmentation reduces the required pre-stress force in the spring while still maintaining the ear muff stable in the standby position, as the second rotation about the second axis provides additional stability without requiring additional spring force.
4Device complexity
If the same force is required for both active and standby position transitions, then the component design is simplified, but the usability and user comfort are reduced
Solution Approach 1:
The force requirements for the two transitions are segmented and optimized independently. The first rotation from standby to active position can be designed with lower force requirements suitable for user comfort, while the second rotation can have different force characteristics. This segmentation allows the system to prioritize user comfort during the critical transition from standby to active position without requiring complex variable force mechanisms throughout the entire system.
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 easier and more comfortable movement of ear muffs between active and standby positions with reduced force requirements, extending the assembly's usable life and providing greater flexibility in positioning.
Implementation Method 1
a spring engaged to the housing and the first end region of the arm
Data Source
AI summary
The present description provides an ear muff attachment assembly. An exemplary ear muff attachment assembly (100) includes a housing (110), an ear muff (130), an arm (120) having first and second end regions, the first end region positioned within the housing and the second end region attached to the ear muff, and a spring (150) engaged to the housing and the first end region of the arm. The arm is rotatable about a first axis of rotation between a first position and an intermediate position, and about a second axis of rotation between the intermediate position and a second position.