Wells – With below and above ground modification – Eduction pump or plunger in well
Patent
1998-05-12
2000-06-27
Lillis, Eileen Dunn
Wells
With below and above ground modification
Eduction pump or plunger in well
166 781, 188184, E21B 4300
Patent
active
060794895
ABSTRACT:
A backspin retarder for a shaft comprises a brake mechanism including a stationary brake member and opposed brake members rotatable with the shaft and movable between braking position in which the movable brake members engage the stationary brake member and a non-braking position in which the movable brake members are removed from the stationary brake member and a brake control mechanism responsive to the direction of rotation of the shaft for disabling the brake mechanism when the shaft rotates in a forward direction and for enabling the brake mechanism when the shaft rotates in a reverse direction.
REFERENCES:
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patent: 4493613 (1985-01-01), Sommer
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patent: 5551510 (1996-09-01), Mills
patent: 5749416 (1998-05-01), Belcher
Blundell Curtis Christopher
Hult Vern Arthur
Lillis Eileen Dunn
Singh Sunil
Weatherford Holding U.S., Inc.
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