| 摘要 |
In certain embodiments, a system includes a cylinder and a piston, the piston positioned within the cylinder and operable to move within the cylinder from a retracted position to an extended position. The system further includes a vacuum port facilitating application of a vacuum pressure to the cylinder, the vacuum pressure resulting in a vacuum force being applied to the piston, the vacuum force causing the piston to move toward the retracted position. The system further includes a spring member configured to apply a spring force to the piston when the piston is in the retracted position, the spring force offsetting at least a portion of the vacuum force. The system further includes a sensor operable to generate a displacement signal in response to detecting movement of the piston from the retracted position toward the extended position.
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