Blowout preventer with locking means

Claim 1

A blowout preventer, comprising: a. a blowout preventer body having a bore through which well pipe may pass, and a ram opening through a wall thereof on at least one side of said bore and communicating with said bore; b. a ram for said ram opening; c. a bonnet detachably connected to said body over said ram opening and adapted to receive said ram when it has been moved to an open position out of said bore; d. an operating cylinder connected to said bonnet and movable therewith; e. a piston connected to said ram and operably disposed in said cylinder for relative movement with respect to said body in response to fluid pressure when said bonnet is connected to said body to move said ram between a closed position wherein said ram extends into said bore in said body and an open position wherein said bore is unobstructed and said ram is disposed outwardly of said ram opening of said body, said piston having a piston rod formed therewith extending outwardly through an opening formed in said cylinder; f. body rod means mounted with said body for supporting said bonnet when said bonneT is in the ram-exposed position; g. pressure means for supplying fluid pressure to said cylinder to cause relative movement between said piston and said cylinder, said pressure means including a fluid passage formed in said body rod means for communicating with said cylinder and supplying fluid pressure thereto; and h. locking means mounted with said body rod means for locking with said piston rod to lock said piston against movement with respect to said body whereby said bonnet can be detached from said body and moved away therefrom to a ram-exposed position by supplying fluid pressure into said cylinder to thereby expose ram for removal or repair.