Pneumatic cylinder

A pneumatic cylinder, comprising:

• a housing comprising a hollow body, an upper cover, and a lower cover, the hollow body including a first part having a fan-shaped cross-section and a side wall, a second part having a half circular section and a side wall, a first compartment on an upper portion, and a second compartment on a lower portion, the first compartment and the second compartment communicating with each other and having the same shape, the upper cover and the lower cover being disposed on the first compartment and the second compartment, thereby forming an activation chamber in the hollow body, the activation chamber including a first activation space in the first part and a second activation space in the second part, the first activation space communicating with the second activation space, the upper cover including a first through hole, and the lower cover including a second through hole aligned with the first through hole;
• a rotor disposed in the activation chamber and including a drive shaft having two ends rotatably disposed in the first through hole and the second through hole respectively, and a blade secured to the drive shaft, the blade being configured to rotate about a drive shaft axis in the activation chamber, the drive shaft being configured to divide the blade into a first section and a second section having a length less than a length of the first section so that the first and second sections are not symmetrical by the division of the drive shaft, the first section is configured to rotate in the first activation space, the second section is configured to rotate in the second activation space, and a plurality of segments are formed on an inner surface of the hollow body along an axial direction of the drive shaft and the segments have the same shape and size;
• and
• two first openings disposed on two sides of the housing respectively so that pressurized gas is configured to pass through one of the first openings into the hollow body to clockwise or counterclockwise rotate the blade about the drive shaft axis prior to exiting from another one of the first openings;
• a gas compartment integrally connected to a side of the housing, the upper cover and the lower cover extend integrally to the gas compartment and form an upper cover and a lower cover of the gas compartment, the gas compartment configured to communicate with the housing via a first channel and a second channel, wherein the gas compartment surrounds the side wall of the second part of the housing and a portion of the side wall of the first part of the housing;
• a flat surface on a bottom of the upper cover of the housing and on a top of the lower cover of the housing respectively, the flat surfaces corresponding to the rotor;
• and
• a seal disposed around the blade to prevent pressurized gas from leaking.