Quarter-Turn Fastening Device for Connector Assembly
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Solution Overview
Problem
Conventional fastening devices for two-part connectors are time-consuming and do not ensure a perfect, reproducible fixing of connector parts, which hinders efficient assembly in applications like aeronautical systems.
Innovation Solution
A fastening device featuring quarter-turn type removable fixing means with foolproofing mechanisms, including a male and female socket system with complementary tooth and housing designs, and an elastically deformable member for secure locking, allowing quick assembly without increasing the number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional screw-nut fastening means are used, then reliable fixing is achieved, but assembly time increases significantly
Solution Approach 1:
The fastening mechanism changes from multiple rotational screw turns to a quarter-turn motion. The socket head cap screw rotates only 90 degrees to engage the slot in the nut, dramatically reducing the angular displacement parameter and thus assembly time while maintaining secure fixing through the slot-groove engagement geometry
2Productivity
If keying means are integrated into fixing means, then assembly speed improves, but fixing precision and reproducibility deteriorate
Solution Approach 1:
The fastening device is segmented into distinct functional elements: the socket head cap screw provides the fastening action, the slot in the nut provides keying/repeatability, and the groove in the screw head provides quarter-turn limitation. This segmentation allows each element to optimize its function independently, achieving both speed and precision
3Reliability
If the number of component parts is increased, then fastening reliability improves, but manufacturing cost increases prohibitively
Solution Approach 1:
The socket head cap screw performs multiple functions simultaneously: it provides the fastening force, the slot in its head limits rotation to a quarter-turn, and the groove engages with the nut's protrusion for positioning. The nut similarly multi-functions by receiving the screw, providing a slot for repeatability, and offering a groove for tool engagement. This multi-functionality reduces component count while maintaining reliability
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
Enables rapid and reliable assembly of connector parts with foolproofing, ensuring efficient and reproducible fixing without additional components, thus reducing assembly time and manufacturing costs.
Implementation Method 1
An elastically deformable member can then be arranged between the head and the corresponding sleeve to bias the pins into the housing of the downstream end portion
Data Source
Figure 1~3
Figure 4~6
AI summary
This two-part connector fastening device for connecting electrical conductors comprises a first socket (12) and a second socket (14) for mounting in respective bores provided in the two parts of the connector. The first and second sockets include additional removable fastening means and keying means (24, 26) to allow the fastening means to cooperate in a single predetermined angular position of the first and second sockets. The removable fastening means are quarter-turn type (43, 44).