Disk 1 rotates about fixed axis A. Levers 4 and 5 turn about fixed axis B and are rigidly attached, one each, to vanes b and a. When disk 1 rotates, vanes a and b are oscillated with levers 5 and 4 by links 2 and 3, connected by turning pairs C and D to disk 1 and levers 5 and 4. Vanes a and b have flap check valves 6 which open when the vanes swing downward and close when they swing upward. When disk 1 rotates, vanes a and b pump air out through pipe e.
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