Evacuation Slide Restraint with Variable Tensile Strength
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Solution Overview
Problem
Conventional evacuation slides in aircraft are susceptible to uncontrolled or unsafe deployment due to improper restraint mechanisms, leading to sagging sections getting caught on the aircraft, 'kiting' in high winds, and blocking the exit, which compromises safety and efficiency during emergency evacuations.
Innovation Solution
A restraint system with adjustable tensile strength, featuring a longitudinal body with varying dimensions and engagement features, forms a closed loop that couples to the evacuation slide and aircraft, allowing controlled deployment by breaking at a predetermined force, ensuring proper extension and contact with the ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a restraint mechanism with uniform dimension is used, then the structure is simple and easy to manufacture, but the tensile strength cannot be adjusted, leading to uncontrolled deployment
Solution Approach 1:
The restraint mechanism employs a longitudinal body with non-uniform cross-sectional dimensions, where different sections have different thicknesses or widths. This local variation in geometry allows different sections to have different tensile strengths, enabling the restraint to be configured for specific deployment control requirements while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent changes the physical parameter of the restraint mechanism by varying the cross-sectional dimensions along the longitudinal body. This parameter variation directly affects the tensile strength distribution, allowing the restraint to provide adjustable holding forces at different sections without requiring complex mechanical adjustment mechanisms.
2Strength
If the restraint is made stronger to prevent sagging, then deployment control improves, but the slide cannot deploy properly due to excessive restraint force
Solution Approach 1:
The restraint mechanism uses sections with different cross-sectional dimensions to provide varying levels of restraint strength at different locations. Weaker sections (with smaller dimensions) allow the slide to deploy smoothly, while stronger sections (with larger dimensions) provide necessary holding forces to prevent sagging and uncontrolled deployment, thus resolving the contradiction between restraint strength and deployment ease.
3Reliability
If a single tensile strength is used for the restraint, then the structure is simpler, but it cannot prevent both sagging and kiting in high winds
Solution Approach 1:
The restraint mechanism incorporates multiple sections with different cross-sectional dimensions along its longitudinal body. Each section's dimension is optimized for specific deployment conditions: some sections provide stronger restraint to prevent sagging, while others provide appropriate resistance to prevent kiting in high winds. This local differentiation enables reliable deployment control across various conditions without requiring multiple separate restraint components.
Data Source
Figure 1A
Figure 1B~4
Figure 5
AI summary
A restraint (120, 220, 420) may include a longitudinal body (130, 230, 330) having a first end (131) and a second end (132). The restraint (120, 220, 420) may also include a plurality of engagement features (135) distributed between the first end (131) and the second end (132). A dimension of at least one of the longitudinal body (130, 230, 330) and the plurality of engagement features (135) may vary along at least a portion of a length of the longitudinal body (130, 230, 330). The restraint (120, 220, 420) may further include a head disposed at the first end of the longitudinal body. The head (140) may define an aperture and may include a pawl (145) that configured to individually engage the plurality of engagement features (135). The dimension may vary incrementally or continuously along at least the portion of the length of the longitudinal body (130, 230, 330) from the first end (131) to the second end (132).