Pyrotechnic Signaling Means Pulling Member Design
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Solution Overview
Problem
The production of pyrotechnic signaling means is complex and hazardous due to the manual knotting of ignition device cables, making it expensive and unsafe.
Innovation Solution
A pulling member with articulated sections connected by hinges allows for automated production and space-saving storage, featuring inner and outer sections with elastic properties for safe handling and automatic unfolding, along with a coupling device for flexible operation and a sealed ignition device for water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a short cable is used as the pulling member, then the pyrotechnic signaling means can be compact, but the cable must be manually knotted to the operating means which makes assembly complex and expensive
Solution Approach 1:
The pulling member is divided into multiple articulated sections that can be collapsed into each other, allowing the cable to be much longer when extended for operation but compact when stored. This segmentation eliminates the need for manual knotting while maintaining compact size.
Solution Approach 2:
The pulling member transitions from a static short cable to a dynamic articulated structure that can extend and collapse. The articulated sections allow the cable to be pulled out to full length for operation and then collapsed back to a compact size for storage and transport.
2Length of moving object
If a long cable is used for the pulling member, then the operating length is sufficient, but it cannot be stored compactly
Solution Approach 1:
The articulated sections of the pulling member are designed to nest within each other when collapsed, similar to a nested doll structure. Each section can be folded into the previous section, achieving maximum compactness while maintaining full operating length when extended.
Solution Approach 2:
The pulling member uses articulated joints that allow dynamic transformation between extended and collapsed states. The sections can pivot and fold relative to each other, enabling the cable to achieve both full operating length and compact storage configuration.
3Adaptability or versatility
If manual knotting is used to attach the cable to the operating means, then the assembly is flexible, but it involves hazards to the person carrying out the assembly process
Solution Approach 1:
The pulling member is integrated directly with the operating means as a single articulated structure rather than being a separate cable that needs knotting. This merging eliminates the hazardous manual knotting process while maintaining the necessary operational flexibility.
Solution Approach 2:
The articulated pulling member is designed to be self-contained and self-activating. The structure itself provides the connection between the pulling action and the operating means, eliminating the need for separate attachment operations that expose workers to pyrotechnic hazards.
Data Source
AI summary
Pyrotechnic signaling means (10) are ignited manually by pulling on a pulling member (24). In known pyrotechnic signaling means (10), the pulling member (24) has a short cable which is knotted to an operating means (26). A knot such as this can be produced only manually, thus making the production of pyrotechnic signaling means (10) quite complex. In addition, an ignition device (14) for known pyrotechnic signaling means (10) has a hole through it for a firing bolt (36) which is connected to the pulling member (24). This allows moisture to enter the pyrotechnic signaling means (10) through the ignition device (14). The pyrotechnic signaling means (10) according to the invention provides for the pulling member (24) to be formed from flexible strip-like sections (48, 50), which are connected by film hinges (54) and can be collapsed, saving space, when not in use. The sections (48, 50) can be integrally connected to an operating means (46), such that the entire pulling member (24) can be formed integrally from plastic and manual fitting of the individual components of the pulling member (24) is superfluous. The invention also provides for the ignition device (14) to be sealed by a coupling device (42) of the pulling member (24) until the pyrotechnic signaling means (10) are activated. This means that no moisture can pass through the ignition device (14) before the pyrotechnic signaling means (10) are activated.