Pyrotechnic Nut Release with Radial Cutter for Compact Bolt Separation
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Solution Overview
Problem
Existing pyrotechnic nut release devices, such as active bolts, require significant axial space due to their design, which limits their compactness and efficiency in component release applications.
Innovation Solution
A pyrotechnic nut release device with a disconnector that translates in a sequential plane with the screw's longitudinal axis, using a pyrotechnic actuator to divide the nut into two parts, supported by a rod perpendicular to the screw axis to prevent bending stress, and featuring damping means and ejection mechanisms for efficient screw release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piston sliding along the axis of the screw is used as a pyrotechnic actuator, then the actuator can effectively release the components, but a large axial space is required
Solution Approach 1:
The patent transitions from axial movement (along the screw axis) to radial movement (perpendicular to the screw axis). The disconnector moves radially to divide the nut into parts, eliminating the need for a long axial piston while maintaining effective component release. This dimensional change resolves the contradiction by achieving reliability without requiring large axial space.
2Reliability
If the nut is divided into parts by radial movement under axial load, then the bolt is released, but bending stress is applied to the screw
Solution Approach 1:
The patent introduces a support as an intermediary element between the disconnector and the screw. This support receives the radial movement force from the disconnector and transfers it to divide the nut, preventing direct transmission of bending stress to the screw. The intermediary support enables reliable bolt release while protecting the screw from harmful bending stresses.
3Reliability
If a support is added to hold the nut during activation, then the stressing and breaking process is improved, but device complexity increases
Solution Approach 1:
The support structure is designed to perform multiple functions: it holds the nut during activation, receives radial movement from the disconnector, transfers force to divide the nut, and prevents bending stress on the screw. By making the support multi-functional, the patent improves the nut breaking process while minimizing the increase in device complexity.
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
The solution enables a more compact and efficient release of the screw by minimizing axial space requirements, reducing stress on the screw, and ensuring rapid and controlled release while maintaining structural integrity.
Implementation Method 1
pyrotechnic actuation means (1) arranged to translate the disconnector (4) in an activation direction (D)
Implementation Method 2
damping means arranged between the housing and the disconnector to dampen the movement of the disconnector when the pyrotechnic means are activated
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a nut releasing device comprising: - pyrotechnic actuation means (1), - a nut (2) designed to hold a screw (3) comprising a longitudinal axis (X), - a cutter (4) designed to move in translation in an activation direction, under the action of the pyrotechnic actuation means (1), so as to split the nut (2) into at least two parts, characterized in that the movement in translation of the cutter (4) lies in a plane intersecting the longitudinal axis (X) of the screw (3).