Linear Actuator Cushion Mechanism for Low-Impact Retraction

The patent applies beforehand cushioning by introducing a cushioning mechanism that includes a cushioning plate, elastic element, and damping element. These components are pre-positioned to engage before the retractable pipe fully retracts into the outer pipe, absorbing and dissipating the impact energy gradually. The elastic element compresses and the damping element dissipates energy through viscous resistance, preventing the sudden impact that would occur with high-speed retraction alone.

The patent applies dynamics by making the braking force variable rather than constant. The cushioning mechanism is designed to provide increasing resistance as the retraction progresses, with the elastic element progressively compressing and the damping element providing velocity-dependent resistance. This dynamic adjustment allows high initial speed for efficiency while automatically reducing speed near the end of retraction to minimize impact force.

The patent applies nesting by placing the cushioning mechanism components within the existing actuator housing. The cushioning plate is positioned at the end of the retractable pipe, the elastic element is mounted within the housing alongside the lead screw, and the damping element is integrated into the same space. This nested arrangement adds the safety function without requiring a separate external cushioning device, thereby limiting the increase in overall device complexity.

The patent applies multi-functionality by designing the cushioning mechanism to simultaneously provide multiple functions: the elastic element provides both cushioning and a return force to maintain engagement, the damping element provides both impact absorption and vibration reduction, and the cushioning plate serves both as a force distribution surface and as a positioning element. This multi-functionality reduces the need for additional separate components.