Gas spring uses the compression of gas to achieve the energy storing purpose. To exhibit the reaction force of the Gas Spring, the reaction force displayed during the compression and the stretching direction of piston rod will be normally used as the basis of implementation.
Normally, the more the gas is compressed, the bigger the reaction force. The maximum value will be generated at F4 position, while F1 exhibit the minimum value of reaction force after the gas expansion. The value of f1 must be higher than that of the subject so as to successfully lift the work piece. Thus, F1 stands for the reaction force of the Gas Spring.