Frangible Fastener Socket Assembly With Reverse Ejection Pin
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Solution Overview
Problem
Current manual tooling for installing frangible fasteners lacks an efficient method for disposing of the fractured portion, which is a critical step in structural fabrication, and existing automated systems are costly and require frequent recalibration.
Innovation Solution
A tooling assembly with a socket body and pin mechanism that allows reversible rotation, enabling the socket body to torque and fracture the frangible fastener, while a pin with mating threads is used to eject the severed section from a retaining device for disposal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If automated tooling is used to install frangible fasteners, then installation precision and consistency are improved, but equipment cost and maintenance requirements increase
Solution Approach 1:
The automated installation system is segmented into modular components: a socket body for torque application, a separate pin mechanism for ejection, and a frictional retaining element. This segmentation allows each component to perform its specific function with high precision while maintaining overall system simplicity and reducing maintenance requirements.
Solution Approach 2:
The tooling assembly incorporates self-ejection functionality where the pin mechanism automatically ejects the fractured fastener portion after installation. This self-service feature eliminates the need for manual intervention and reduces maintenance complexity while maintaining installation precision.
2Device complexity
If manual tooling is used to install frangible fasteners, then equipment cost and maintenance requirements are reduced, but disposal efficiency of fractured portions deteriorates
Solution Approach 1:
The tooling assembly incorporates self-ejection functionality where the pin mechanism automatically ejects the fractured fastener portion after installation. This self-service feature eliminates the need for manual intervention and reduces maintenance complexity while maintaining installation precision.
Solution Approach 2:
The frictional retaining element is pre-configured to hold the fractured portion during installation, and the pin mechanism is pre-positioned to eject it afterward. This preliminary arrangement ensures efficient disposal without requiring complex additional equipment.
3Manufacturing precision
If the socket body is rotated in first direction to torque the fastener, then fastener installation is achieved, but the severable section fractures and requires disposal
Solution Approach 1:
The pin mechanism extracts the fractured portion from the socket body after installation by engaging the ejection shaft with mating threads. This extraction function separates the disposal task from the installation process, maintaining installation precision while efficiently removing the fractured portion for disposal.
Solution Approach 2:
The system uses reversible rotation of the socket body: first direction for torquing and installation, second direction for engaging the pin mechanism to eject the fractured portion. This inversion of rotation direction allows the same component to perform both installation and disposal functions.
4Reliability
If the pin is resiliently urged to engage the keyed tip with the stud, then rotation prevention is achieved, but the pin must be disengaged for ejection
Solution Approach 1:
The pin mechanism uses resilient urging to dynamically engage and disengage the keyed tip with the stud. This dynamic engagement provides reliable rotation prevention during installation while allowing easy disengagement for ejection, maintaining reliability without excessive complexity.
Solution Approach 2:
The pin mechanism operates in periodic cycles: engaged to prevent rotation during torquing, then disengaged to allow ejection. This periodic action pattern ensures reliable rotation prevention when needed while simplifying the ejection process when the pin is disengaged.
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
Facilitates efficient installation and disposal of frangible fasteners, reducing maintenance costs and improving the handling of fractured sections, making the process more economical and reliable.
Implementation Method 1
A frangible fastener is inserted in a socket in a second end portion of a bore in the socket body and engaged by a frictional retaining element
Data Source
AI summary
A tooling assembly for fastener installation has a socket body reversibly rotatable by a driving mechanism. A bore in the socket body has a first end portion and a central portion incorporating threads. A second end portion of the bore receives and engages a severable section of a frangible fastener. A pin is received in the bore and constrained from rotation by the driving mechanism. The pin has an ejection shaft with mating threads selectively receivable in the threads of the central portion of the bore. The socket body is freely rotatable with the mating threads positioned in the first end portion of the bore. Rotation of the socket body in torques the frangible fastener on a stud fracturing the severable section. Reverse rotation of the socket body engages the mating threads in the threads translating the pin. The ejection shaft ejects the severable section from the second end portion.