Patent ID: 11933329
Assignee: nan
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A pneumatic actuator comprising:
a first cylinder including a first cylinder tube and a first piston that divides a space inside the first cylinder tube into two air chambers;
a second cylinder including a second cylinder tube and a second piston that divides a space in the second cylinder tube into two air chambers, wherein the second piston is connected to the first piston so that the first piston and the second piston have the same displacement; and
a control valve,
wherein, among two pressure receiving surfaces of the first piston and two pressure receiving surfaces of the second piston, one of the two pressure receiving surfaces of the first piston has a smallest cross-section area and one of the two pressure receiving surfaces on the same side of said one of the two pressure receiving surfaces of the first piston has a third smallest cross-section area, and wherein the two air chambers of the first cylinder and the two air chambers of the second cylinder are referred to as, in ascending order in the cross-section area, a first air chamber, a second air chamber, and a third air chamber and a fourth air chamber, the control valve is operable to position the pneumatic actuator such that in a forward stroke of the first and second piston an air pressure source is connected only to the first air chamber, the second air chamber is connected only to the third air chamber, and only the fourth air chamber is opened to the atmosphere.