Rail Vehicle Flap Catching Safeguard Mechanism
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Solution Overview
Problem
Existing solutions for flaps in rail vehicles, such as catch straps and gas pressure springs, face issues like jamming, safety concerns, and high maintenance costs, while manual intervention is required for some support systems, which are inconvenient and do not effectively limit the flap's opening angle or prevent swinging.
Innovation Solution
A safety catch with an automatic roll-up mechanism, using a safety harness or rope that is rolled onto a roller when the flap is closed and unrolled when opened, providing controlled movement and preventing swinging, with a spring element for automatic retraction and fire-resistant materials for safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If catch straps are used to limit the opening angle of the flap, then the flap opening angle is limited and swinging is prevented, but the straps easily get caught or jammed in the space behind the flap and cannot unfold as desired
Solution Approach 1:
The safety catch is extracted from the traditional strap form and reimagined as a retractable mechanism with a spool and cable system. This extraction allows the safety function to be decoupled from the problematic strap configuration, eliminating the jamming issue while maintaining the angle limitation function.
Solution Approach 2:
The safety catch transitions from a static strap to a dynamic retractable system. The cable can extend and retract automatically based on flap position, providing continuous adaptability during flap operation. This dynamic behavior prevents the cable from getting jammed while maintaining reliable angle limitation.
2Ease of operation
If gas pressure springs are used to support the flap, then the flap can be held in open position, but the system becomes expensive and prone to failure requiring frequent maintenance
Solution Approach 1:
The patent replaces expensive gas pressure springs with a simpler, more robust mechanical retractable catch system. The spool and cable mechanism uses durable, easily replaceable components that are less prone to failure and require minimal maintenance, effectively treating the support mechanism as a more reliable, long-lasting solution.
Solution Approach 2:
The retractable safety catch is designed to be self-regulating through its spring-loaded spool mechanism. The system automatically provides the necessary support force without requiring external control systems or complex adjustment mechanisms, making it self-sufficient and reducing maintenance needs.
3Ease of operation
If rigid support rods with catch hooks are used, then the flap can be supported in open position, but manual intervention is required which is inconvenient
Solution Approach 1:
The retractable safety catch with automatic reel mechanism provides self-service functionality. As the flap moves to different positions, the cable automatically extends or retracts based on the spring tension, eliminating the need for manual intervention to engage or disengage support elements.
Solution Approach 2:
The spring-loaded spool is pre-loaded with tension that automatically engages the safety catch at the appropriate flap angle. This preliminary action ensures the safety mechanism is ready to engage without requiring manual activation, providing automatic support when the flap reaches the limited opening position.
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 ensures safe and convenient operation of the flap, preventing unintended opening and reducing maintenance needs, while meeting fire protection requirements and allowing controlled opening angles without snagging or pinching issues.
Implementation Method 1
The roller is preferably connected to a spring element that is tensioned when the leash or belt is unrolled. The energy stored by the tension in the spring element causes the leash or belt to be rolled back onto the reel when the flap is closed.
Data Source
Figure 1
Figure 2
AI summary
Flap (4) for closing an opening in the interior of a rail vehicle, which comprises a catching safeguard (100), wherein the catching safeguard is a catching belt or a catching line (101) which is arranged between the flap (4) and a fixed mount (102), is rolled up on a roll (107) in a closed position of the flap (4), and when opening the flap (4) is unrolled from a roll (107) and catches the flap in an opened position.