Expansible chamber devices – Piston – Side wall portion includes peripheral axially extending...
Patent
1983-11-29
1985-07-16
Look, Edward K.
Expansible chamber devices
Piston
Side wall portion includes peripheral axially extending...
92240, 166202, 277212C, 417555A, F16J 900
Patent
active
045288968
ABSTRACT:
Gas and oil well swabs, particularly a dynamic seal for maintaining gas-tight contact between the moving swab and the well casing. The seal includes a reinforcing tube and a flexible annulus having an upper throat portion complementally engaging the exterior of the reinforcing tube and a lower bell-shaped skirt portion, engageable with the well casing. The lower bell-shaped skirt portion of the seal defines an expansion chamber for the well gas, which lifts the swab.
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