Title:
LONG-STROKE WELL PUMP DEVICE
Document Type and Number:
Japanese Patent JPS5954786
Kind Code:
A
Abstract:
A yo-yo variety reversing mechanism for long stroke, well pumping units, which employ a lift belt as the operative link between a winding drum and the polish rod of the well pump. Shock experienced between transfer from an upstroke to a downstroke is cushioned by the reversing mechanism or control which provides a power source off dwell period during the aforesaid stroke exchange. Further cushioning is provided by a novel winding drum for the lift belt which decreases the effective radius of the drum at the point of exchange from a downstroke to an upstroke to thus slow movement of the belt and cushion the shock of exchange from a downstroke to an upstroke.
Inventors:
EMIIRU EI BENDAA
Application Number:
JP11681383A
Publication Date:
March 29, 1984
Filing Date:
June 28, 1983
Export Citation:
Assignee:
RIIDO AMERIKAN PURODAKUTSU CO
International Classes:
F04B47/02; (IPC1-7): F04B47/02
Attorney, Agent or Firm:
Kaname Yumi