초록 ▼

A ram lock for blowout preventer rams which permits locking of the ram at multiple and adjustable positions. Automatic locking of the ram at a desired position, such as in adjustable sealing positions to compensate for ram elastomer wear, is obtained. The ram also automatically unlocks in response t

A ram lock for blowout preventer rams which permits locking of the ram at multiple and adjustable positions. Automatic locking of the ram at a desired position, such as in adjustable sealing positions to compensate for ram elastomer wear, is obtained. The ram also automatically unlocks in response to opening fluid pressure acting on a cylinder liner which contains a ram carrier moving the ram.

대표청구항 ▼

In a blowout preventer having at least one blowout preventer ram movable therein to adjustable closed positions for sealing contact with a well pipe or the like in a bore of the blowout preventer, a ram lock comprising: (a) ram carrier means comprising a ram piston having a piston rod with a threade

In a blowout preventer having at least one blowout preventer ram movable therein to adjustable closed positions for sealing contact with a well pipe or the like in a bore of the blowout preventer, a ram lock comprising: (a) ram carrier means comprising a ram piston having a piston rod with a threaded surface formed thereon for moving the ram to the adjustable closed positions in the blowout preventer; (b) cylinder means for receiving opening and closing fluid pressures to operate against said ram piston to move the ram to and from open and closed positions, respectively; (c) lock means for locking said ram carrier means at the closed positions, comprising: (1) a lock nut having a threaded surface formed thereon and engaged by said threaded surface on said ram piston rod for rotational movement with respect thereto during movement of the ram; (2) a ram carrier clutch plate mounted with said lock nut for rotational movement therewith, said ram carrier clutch plate having ratchet teeth formed thereon; (3) a body clutch plate having ratchet teeth formed thereon; and (4) means for mounting said body clutch plate with the blowout preventer against relative rotational movement with respect thereto; and (d) means for urging said ratchet teeth of said body clutch plate and said ram carrier clutch plate into engagement to lock said ram carrier means; and (e) means for unlocking comprising cylinder liner means mounted in said cylinder and enclosing said piston of said ram carrier means; (f) said cylinder liner means including surface means responding to the opening fluid pressure to engage said body clutch plate to disable said means for urging and unlock said ram lock.