A linear telescopic actuator comprising: • a cylinder; • a sliding part extending at least in part inside the cylinder in order to slide therein along a sliding axis (X-X'); • a spring seat that is arranged at least in part inside the cylinder; and • at least a first compression spring arranged inside the cylinder between said sliding part and the spring seat in order to be capable of resiliently opposing the sliding part approaching the spring seat, and wherein, the spring seat presents an outer annular groove and the cylinder includes an inner annular groove, the actuator further presenting a blocking part, the actuator being adapted to adopt selectively an assembled configuration and a disassembled configuration, the blocking part in the assembled configuration being engaged inside the inner and outer annular grooves (6, 7) and forming an obstacle opposing sliding of the spring seat relative to the cylinder, and the blocking part in the disassembled configuration being disengaged from at least one of the inner and outer annular grooves (7, 6) in order to allow the spring seat to slide relative to the cylinder, the blocking part and the inner and outer annular grooves (7, 6) being adapted: A) to allow the actuator to pass from its assembled configuration to its disassembled configuration when a first force is exerted on the spring seat along said sliding axis (X-X) in a first direction going from the spring seat towards the spring, this first force presenting a first magnitude greater than a predetermined minimum threshold; and B) to prevent the actuator from passing from its assembled configuration to its disassembled configuration: • when a force is exerted on the spring seat in said first direction with a magnitude less than or equal to the predetermined minimum threshold; or • when a force is exerted on the spring seat in a second direction opposite to said first direction. • a cylinder; • a sliding part extending at least in part inside the cylinder in order to slide therein along a sliding axis (X-X'); • a spring seat that is arranged at least in part inside the cylinder; and • at least a first compression spring arranged inside the cylinder between said sliding part and the spring seat in order to be capable of resiliently opposing the sliding part approaching the spring seat, and wherein, A) to allow the actuator to pass from its assembled configuration to its disassembled configuration when a first force is exerted on the spring seat along said sliding axis (X-X) in a first direction going from the spring seat towards the spring, this first force presenting a first magnitude greater than a predetermined minimum threshold; and B) to prevent the actuator from passing from its assembled configuration to its disassembled configuration: • when a force is exerted on the spring seat in said first direction with a magnitude less than or equal to the predetermined minimum threshold; or • when a force is exerted on the spring seat in a second direction opposite to said first direction. • when a force is exerted on the spring seat in said first direction with a magnitude less than or equal to the predetermined minimum threshold; or • when a force is exerted on the spring seat in a second direction opposite to said first direction.