PLUNGER FOR OIL-WELL SUCKER-ROD PUMP Russian patent published in 1997 - IPC

FIELD: pump engineering. SUBSTANCE: pump has rod 1 whereon bushings 2 provided with outer spherical surfaces at the end faces are mounted with a spaced relation and disconnecting members 3. The end faces of the disconnecting members are provided with inner cones or spherical surfaces of radius no more than the radius of the spherical surfaces of bushings 2. Bushings 2 and disconnecting members 3 are tightened by means of thrust clutches 5 and 6 through flexible member 4, e.g. a spring. The inner diameter of disconnecting members 3 and 7 are provided with ring grooves 10 for sealing rings 11. EFFECT: improved design. 2 dwg