초록 ▼

Wire line core barrel apparatus that includes a wire line core barrel inner tube assembly movable through a drill stem to be seated in a latched core taking position adjacent the drill stem core bit, and a main overshot assembly that is coupled to a lowering overshot assembly for lowering the inner

Wire line core barrel apparatus that includes a wire line core barrel inner tube assembly movable through a drill stem to be seated in a latched core taking position adjacent the drill stem core bit, and a main overshot assembly that is coupled to a lowering overshot assembly for lowering the inner tube assembly and alternately coupled to a retracting overshot assembly for withdrawing the inner tube assembly. The inner tube assembly includes a generally annular overshot coupling member secured to a latch release tube that is mounted on a latch body to retract a pair of latches when said tube is moved axially outwardly relative the latch body, and an overshot coupling rod secured to the latch body and extended through the coupling member. The lowering overshot assembly has a lock coupling for releasably couplingly engaging the coupling rod that upon pulling on the lowering assembly with more than a given force will release coupling engagement of the lowering with the coupling rod. The retracting overshot assembly has a collet that will couplingly engage the coupling member upon lowering the retracting overshot assembly, and that upon withdrawing the retracting overshot assembly moves the latch release tube to first move the latches to a retracted position and then retract the inner tube assembly.

대표청구항 ▼

A wire line core barrel inner tube assembly comprising tubular means for receivingly retaining a core therein, a latch body, means for connecting the core receiving means to the latch body, a latch mounted on the latch body for limited movement relative thereto between a drill stem latch seat engagi

A wire line core barrel inner tube assembly comprising tubular means for receivingly retaining a core therein, a latch body, means for connecting the core receiving means to the latch body, a latch mounted on the latch body for limited movement relative thereto between a drill stem latch seat engaging position and a retracted position, latch release means mounted on the latch body for limited movement relative thereto for releasing the latch from the drill stem latch seat engaging position, and a first overshot coupling member fixedly secured to the latch body.