초록 ▼

A locking mechanism for securing the upper housing of an annular blowout preventer to the lower housing. A split latch ring having a plurality of angled teeth cut in its outer diameter is expandable into the lower housing which is provided with a plurality of locking grooves contoured to mate with t

A locking mechanism for securing the upper housing of an annular blowout preventer to the lower housing. A split latch ring having a plurality of angled teeth cut in its outer diameter is expandable into the lower housing which is provided with a plurality of locking grooves contoured to mate with the teeth. A locking ring with a tapered outer surface mates with a tapered inner surface on the latch ring for expanding the latch ring. Bolting the inner locking ring to the upper housing causes downward movement of the locking ring forcing the latch ring outwardly and down the taper of the engaging teeth. The upper housing is locked to the lower housing as the upper housing has a shoulder engaging the lower edge of the downwardly moving latch ring causing seating of the upper housing on to the lower housing and compensating for variations in machining tolerances.

대표청구항 ▼

In an annular blowout preventer adapted for use on an oil or gas well rig, and having a lower housing, an upper housing, a resilient sealing means therein, and a piston for actuating said sealing means, the improvement in locking means for securing the upper housing to the lower housing, comprising:

In an annular blowout preventer adapted for use on an oil or gas well rig, and having a lower housing, an upper housing, a resilient sealing means therein, and a piston for actuating said sealing means, the improvement in locking means for securing the upper housing to the lower housing, comprising: a split circular latch ring having a plurality of teeth on its outer surface, said teeth angled outwardly and downwardly, said ring having a tapered surface on its inner surface tapered downwardly and inwardly, said lower housing having a plurality of locking grooves contoured to mate with said teeth, said upper housing having a seating surface for engaging said lower housing, and having a shoulder for engaging the lower edge of said latch ring, a locking ring having a tapered surface on its outer surface contoured to mate with the tapered inner surface on said latch ring, and telescopically engaging said upper housing, and securing means for securing said locking ring to said upper housing whereby tightening said securing means produces downward movement of said locking ring relative to said upper housing, said downward movement forcing said latch ring outward and forcing said teeth outward and down the mating contours of said locking grooves, said teeth and said locking grooves including surfaces which are spaced from each other insuring the downwardly movement of said latch ring and said upper housing to seatingly engage said seating surface of said upper housing with said lower housing and to lock together said housings.