LINK-GEAR MECHANISM OF A ROTARY SECTOR-VANE PUMP

Double crank 1 rotates about fixed axis A and is connected by turning pairs C and D to sliders 4 and 5, which slide along slots e and f of links 2 and 3. Links 2 and 3 rotate about common fixed axis B. Rigidly secured to links 2 and 3 are equal sectors a. When crank 1 rotates, sectors a deliver liquid in the direction of the arrows.
$3807$LHP,RP$