초록 ▼

There is disclosed a blowout preventer having rams with cutting edges for shearing a pipe within which carry means for gripping opposite sides of the pipe above the cutting edges of the rams, as the rams move toward one another to shear the pipe, and lifting the upper sheared end of the gripped pipe

There is disclosed a blowout preventer having rams with cutting edges for shearing a pipe within which carry means for gripping opposite sides of the pipe above the cutting edges of the rams, as the rams move toward one another to shear the pipe, and lifting the upper sheared end of the gripped pipe out of the path of means for sealing between the inner ends of the rams, as the rams continue to move toward one another.

대표청구항 ▼

A blowout preventer, comprising a housing having a bore therethrough and opposed guideways which intersect the bore, rams reciprocable within the guideways between bore opening and closing positions, means for sealing between the inner ends of the rams and between each ram and its guideways when the

A blowout preventer, comprising a housing having a bore therethrough and opposed guideways which intersect the bore, rams reciprocable within the guideways between bore opening and closing positions, means for sealing between the inner ends of the rams and between each ram and its guideways when the rams are closed, means connecting the bore of the housing beneath the closed rams with chambers in the housing behind the closed rams so that fluid in the bore urges the rams closed, means including a passageway through only one ram connecting the chamber behind said one ram with the bore of the housing above the closed rams, and means for reciprocating the rams between opened and closed positions including means for closing the passageway as the one ram is moved inwardly and opening the passageway as it is moved outwardly.