ELEVATOR FOR TWO PIPE STRINGS TRIP

FIELD: oil-and-gas industry.SUBSTANCE: proposed elevator comprises case, flap and flaps locking mechanism. Round recess for pipe is arranged at the case front surface. Flap is articulated with said case. Extra round recess is made at front surface for second pipe and equipped with extra flap. Said flap is articulated also with said case and extra flaps locking mechanism. Counterweight is arranged at case rear side. Said flaps locking mechanism comprises rotary lever with handle. Control lever interacts with spring-loaded flap rotary retainer interacting with round groove in closed position. Groove centre at flap closed position is aligned with flap retainer turn axis centre. Spring-loaded flap rotary latches are articulated with the case to interact with retainer in flap closed position. Note here that said round recesses for pipes, flaps and their locking mechanisms are symmetric about the case crosswise axis. Spacing between round recesses centres is larger than diameter of pipes couplings. Rotary control levers with handles interact with retainers and are articulated with flaps. Round grooves are made in round recess walls. Linear sizes in horizontal plane perpendicular to lengthwise axis passing through round recess centres in closed position of flaps satisfy the relationships: L