Reciprocating drive and reversing mechanism for long stroke, well pumping unit
OwnerEmil A. Benderinventor
Life of this patent
Estimating the term…
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.
Claims5
A long stroke, well pumping unit comprising:
- a base platform;
- a tower on the base platform;
- drive train means including rotatable, winding drum means on the base platform and power means to rotate the drum means;
- a flexible lift belt attached at one end to the drum means and at its other end to the polish rod of a pump;
- a freely rotatable spool mounted atop the tower, the belt being trained over the spool;
- a counterweight attached to that portion of the lift belt between the spool and the rotatable drum;
- and means for reversing the power means, thus to cyclically wind and unwind the belt from the winding drum and thus impart reciprocating movement to the polish rod of a pump, said reversing means including:
- rotary motion transmission means responsive to rotation in the drive train means;
- control means responsive to said transmission means;
- and a three position limit switch operable from said control means, the switch being arranged to cause the power means to rotate the winding drum clockwise in a first position and counterclockwise in a second position, the third position of the switch being an off position and providing a dwell or rest period between reversals of said power means, the control means being arranged to move the limit switch to the third position when the counterweight is in its lowermost position and to maintain the limit switch in one of the first or second positions at all other times.
In a long stroke, well pumping unit including a base platform, a tower on the base platform, drive train means including rotatable winding drum means on the base platform and power means to rotate the drum means, a flexible lift belt attached at one end to the drum means and at its other end to the polish rod of a pump, a freely rotatable spool mounted atop the tower, the belt being trained over the spool, a counterweight attached to that portion of the lift belt between the spool and the rotatable drum;
- means for reversing the power means, thus to cyclically wind and unwind the belt from the winding drum and thus impart reciprocating movement to the polish rod of a pump;
- said reversing means including:
- rotary motion transmission means responsive to rotation in the drive train means;
- control means responsive to said transmission means;
- and a three position limit switch operable from said control means, the switch being arranged to cause the power means to rotate the winding drum clockwise in a first position and counterclockwise in a second position, the third position of the switch being an off position and providing a dwell or rest period between reversals of said power means, the control means being arranged to move the limit switch to the third position when the counterweight is in its lowermost position and to maintain the limit switch in one of the first or second positions at all other times.
Dependencies are inferred from the claim text.