Spacecraft Hatch Mechanism with Outward-Facing Seal
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Solution Overview
Problem
Conventional hatch designs for spacecraft face issues such as seals facing inward, leading to damage and inefficiency due to cumbersome mechanisms.
Innovation Solution
A hatch mechanism with four pivotably attached arms that keep the sealing surface facing outward, minimizing wear and occupying minimal space, using a movement mechanism that maintains the seal away from the interior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hatch designs are used with seals facing inward, then the hatch can open and close, but the seals and sealing surfaces are damaged by people or equipment inside the vehicle
Solution Approach 1:
The patent inverts the conventional hatch opening direction by making the seal face outward during opening operation. The hatch opens in a direction that exposes the sealing surface to the exterior environment rather than the interior, thereby protecting the seal from damage by people or equipment inside the vehicle while maintaining sealing functionality
2Ease of operation
If conventional hatch mechanisms are used, then the hatch can operate, but they are cumbersome and inefficiently shaped or sized
Solution Approach 1:
The patent divides the hatch mechanism into multiple segments including a hatch portion, a base portion, and multiple arms (first arm and second arm) that are pivotably connected. This segmentation allows each component to perform its specific function independently, improving operational efficiency while reducing overall structural complexity through modular design
Solution Approach 2:
The patent employs dynamic pivot connections between the hatch portion, base portion, and arms, allowing the mechanism to adapt its configuration during opening and closing operations. The pivot axes are positioned to optimize the movement trajectory, making the hatch operation smoother and more efficient while reducing the need for complex fixed structures
3Device complexity
If hatch mechanisms are designed to open like a door with fixed hinges, then the structure is simple, but the seals face inward increasing damage risk
Solution Approach 1:
The patent inverts the conventional door-like opening mechanism by positioning the seal to face outward during opening. The hatch portion rotates about a pivot axis such that the sealing surface is exposed to the exterior environment, fundamentally changing the opening dynamics to protect the seal while maintaining structural simplicity
Solution Approach 2:
The patent introduces a dimensional change in the opening motion by rotating the hatch portion about a pivot axis that is offset from the sealing surface. This creates a multi-dimensional movement trajectory where the seal faces outward during the opening arc, protecting the seal from interior damage while keeping the mechanism structure relatively simple
Data Source
AI summary
A representative hatch system can include a base portion surrounding an opening, a hatch portion movable relative to the base portion between a closed configuration and an open configuration, and a movement mechanism positioned to move the hatch portion relative to the base portion between the closed and open configurations. The movement mechanism can include four arms pivotably attached to the hatch portion and the base portion via four pivot axes. When the hatch portion is in the closed configuration, the axes can be coplanar. The axes can be spaced apart from a sealing plane between the hatch portion and the base portion. The arms can traverse a periphery of the hatch portion. A representative aerospace system can include a hatch system supported in a wall portion of an aerospace vehicle. The movement mechanism can keep the sealing surface of the hatch facing away from an interior of the vehicle.