Spring Clutch Arm Assembly for Stable Screen Positioning
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Solution Overview
Problem
Passenger seat arm mechanisms in vehicles face challenges in supporting increasing screen sizes and loads while maintaining adjustability and preventing unintended movement, which can lead to damage or injury.
Innovation Solution
A spring clutch arm assembly with a moveable arm and a spring portion wrapped around a fixed shaft, featuring adjustable friction through varying diameters and a bushing system, allows for ergonomic positioning and resistance control, ensuring the arm remains in a desired configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a moveable arm mechanism is designed to support larger screen sizes and heavier loads, then the load-bearing capacity is improved, but the weight of the moveable arm increases
Solution Approach 1:
The moveable arm mechanism is divided into multiple segments connected by articulating hinges and joints, allowing each segment to be optimized for strength-to-weight ratio. The spring portion is segmented into coil windings that provide incremental support, enabling the system to bear heavy loads while keeping individual components lightweight.
Solution Approach 2:
The mechanism transitions from a static rigid structure to a dynamic system with articulating joints and a spring component. The spring portion dynamically adjusts its compression state based on the arm's position and load, providing variable support that reduces the need for overly robust (and heavy) structural components throughout the entire range of motion.
2Stability of the object's composition
If friction between the coil portion and fixed shaft is increased to prevent unintended movement, then stability is improved, but the ease of operation deteriorates
Solution Approach 1:
The friction characteristic is made dynamic through the varying diameter of the coil portion. As the spring compresses or extends, the contact diameter changes, automatically adjusting the friction force. This provides high friction (stability) when the arm is held in position and lower friction (ease of movement) when the arm is being repositioned by the user.
Solution Approach 2:
The physical parameter of the coil portion's contact diameter is changed as the spring undergoes compression or extension. This parameter change directly affects the friction force between the coil and fixed shaft, enabling the system to provide different friction levels depending on the operational state without requiring external control mechanisms.
3Ease of operation
If the moveable arm is designed to allow easy adjustment for perceived resistance, then ease of operation is improved, but the device complexity increases
Solution Approach 1:
The mechanism provides self-adjusting resistance through the inherent mechanical properties of the spring and friction interface. The varying diameter of the coil portion automatically creates different friction forces at different positions, eliminating the need for external actuators, sensors, or control systems to adjust resistance. The system serves itself by converting positional changes into friction variations.
Solution Approach 2:
Complex electronic or motorized resistance adjustment systems are replaced with a purely mechanical friction-based mechanism. The spring clutch arm assembly uses the physical interaction between the coil portion and fixed shaft to provide adjustable resistance, substituting sophisticated control systems with a simple, reliable mechanical solution that achieves the same functional outcome.
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 solution effectively supports significant loads, allows for easy deployment and retraction, and prevents accidental movement, thereby safeguarding electronic devices and passengers by managing resistance through adjustable friction mechanisms.
Implementation Method 1
friction between the coil portion and the fixed shaft increases
Data Source
AI summary
A spring clutch arm assembly includes a moveable arm comprising a retracted configuration and a deployed configuration, a fixed shaft, and a spring portion comprising a moving portion with a distal end and a coil portion wrapped around the fixed shaft. The moveable arm may include a moveable member. The distal end may be attached to the moveable member. The moveable arm may be held in the deployed configuration by the spring portion.