Naval Shock-Proof Door Locking Strips
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Solution Overview
Problem
Existing shock-proof door or hatch arrangements on naval ships face challenges in transferring shock forces effectively to prevent unintentional opening during severe events, particularly due to difficulties in remote actuation and linkage handling post-shock stress.
Innovation Solution
The design incorporates continuous locking strips on the frame's longitudinal sides, with a stationary locking strip engaging in the sash frame's groove and an adjustable locking strip guided by actuating elements, including pneumatic cylinders and pivotable levers, along with a safety bar and shock limiters, to absorb shock loads and allow remote operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism with multiple rod elements and ball elements is used, then the door can be locked securely, but the actuation becomes complex and the rods may become unhandleable after shock exposure
Solution Approach 1:
The locking mechanism is divided into multiple discrete locking elements (locking strips with locking surfaces) distributed along the longitudinal sides of the frame, each capable of independent engagement with corresponding grooves in the sash frame. This segmentation allows the locking function to be distributed rather than centralized in a complex mechanism.
Solution Approach 2:
The complex actuation system with multiple rod elements and ball elements is replaced by a simplified actuation concept where a single adjustable locking strip engages with the sash frame groove. The harmful complexity of remote actuation linkages is extracted and eliminated, retaining only the essential locking function.
2Strength
If continuous locking strips are used on the frame, then shock loads can be absorbed continuously, but the device complexity increases due to additional actuating elements
Solution Approach 1:
The locking strip is designed to be adjustable in the longitudinal direction of the frame, allowing dynamic adaptation to different sash positions and shock conditions. This adjustability is achieved through a drive mechanism that can reposition the locking strip along the longitudinal axis, optimizing the locking engagement under varying operational conditions.
Solution Approach 2:
The adjustable locking strip combines multiple functions into a single component: it provides continuous shock load absorption, maintains secure locking engagement, and allows remote actuation through integrated drive mechanisms. The locking surface, adjustment mechanism, and actuation interface are merged into one unified structure.
3Reliability
If the locking bar is made adjustable to prevent displacement, then locking reliability improves, but the mechanism requires additional actuating levers and pneumatic cylinders
Solution Approach 1:
The parallel locking bar is positioned and configured to prevent displacement of the primary locking bar in the closed position. This preliminary protective arrangement ensures that even if the primary locking mechanism experiences unexpected forces, the parallel bar maintains the locking position and prevents unintended opening.
Solution Approach 2:
Pneumatic cylinders and pivotable actuating levers serve as intermediary mechanisms that translate remote control signals into precise adjustment movements of the locking strips. These intermediaries enable reliable remote operation while maintaining simple mechanical interfaces at the locking points themselves.
Data Source
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AI summary
In a device for shock-resistant door or hatch arrangement on naval vessels, interlocking corresponding locking elements, which can be adjusted via a handle, are arranged to fix a sash in the frame. The frame is provided with continuous locking strips as locking elements on two opposite long sides, which can be received in corresponding grooves in a sash frame. The side of the sash that is pivotally connected to the frame has a stationary locking strip for insertion into the groove of the sash frame during a closing movement of the sash. On the opposite side, a locking strip is guided into the frame and can be inserted into a groove in the sash frame for locking purposes using adjusting elements when the sash is in the closed position.