CubeSat Separation Device Using Pogo-Pin for Wire Severing

The patent combines the restraining wire, resistor, and spring into a single integrated separation device assembly. The wire serves dual purposes as both a restraining element and a heating element when current passes through it, eliminating the need for separate explosive charges or shape memory alloy components. This merged design achieves multi-directional restraint capability while maintaining simplicity and low weight.

The restraining wire is designed to function as both a mechanical restraint element and a thermal separation actuator. When electrical current passes through the wire, it generates heat to sever the restraint, enabling the same component to perform both restraining and separation functions. This multi-functionality reduces device complexity while maintaining effective separation capability.

The patent replaces the chemical explosive system with a thermal-mechanical separation mechanism. Electrical current heated through the restraining wire causes the wire to expand and sever, releasing the deployable structure. This substitution eliminates the high-impact shock waves and debris generation associated with explosives, protecting sensitive CubeSat components while achieving adequate separation force through spring elastic energy.

The separation mechanism utilizes controlled thermal parameter changes in the restraining wire. By passing electrical current through the wire, its temperature increases causing thermal expansion and eventual failure of the wire. This controlled parameter change provides a gentle, predictable separation force that avoids the harmful impacts of explosive decomposition, while still achieving the necessary separation capability.

The patent employs a simple, inexpensive restraining wire that is designed to be consumed during the separation process. The wire serves its restraining function during launch and then deliberately fails when heated by electrical current, providing a low-cost alternative to expensive shape memory alloy components. This disposable element approach achieves gentle separation without the weight and cost penalties of recoverable shape memory materials.

The patent replaces the complex phase-transition mechanism of shape memory alloys with a simpler thermal-heating-and-severing mechanism. Instead of relying on the expensive and weighty shape memory effect, the system uses electrical heating to expand and break a simple wire, achieving comparable low-impact separation with significantly reduced mass and cost suitable for CubeSat constraints.

The pogo-pin contactor serves dual functions: it provides electrical connection for power transmission to heat the restraining wire, and simultaneously serves as a deployment verification sensor. When the deployable structure deploys, the contactor loses electrical connection, providing a simple binary signal that confirms deployment status. This eliminates the need for separate verification systems while maintaining reliable deployment monitoring.

The patent merges the power transmission function and deployment verification function into a single pogo-pin contactor mechanism. The same electrical contact that delivers current to heat and break the restraining wire also serves as the sensor that detects deployment by monitoring the loss of electrical connection. This combined design achieves reliable verification capability without adding separate sensors or communication systems, maintaining simplicity and low weight.