Patent ID: 7832469

Claim:
A device for remotely actuating a safety lock of an individual oil pumping apparatus, the apparatus being of the type for extraction of oil in oil wells and includes a motor, coupled to a gear box having an output shaft operatively connected to a mechanism for moving the apparatus with the movement of the apparatus being alternatively restricted by a brake with the brake being capable of being locked by a locking device arranged in the apparatus, wherein the locking device comprises a safety lock including a first end rotatably connected to the gear box and a second end vertically movable and alternatively resting on and locking into at least one peripheral groove of a toothed disc, the disc being fixedly connected to the output shaft of the gear box, wherein a safety locking position for the apparatus is defined when the said lock is in a lower position, locked in a groove of the disc, and an unlocked position for the apparatus is defined when the lock is in an upper position, and wherein the locking device includes means for moving upwardly and downwardly the safety lock, said means for moving upwardly and downwardly being capable of being actuated by an operator in a lower portion of the apparatus and wherein said means for moving upwardly and downwardly the safety lock comprises a rotating crank arranged in the lower part of the apparatus, the crank being mechanically connected to at least one rotating transferring rod connected to at least one crosshead, the rod being mechanically connected to an endless screw that rotates within a threaded bushing located just below the vertically moving end of the safety lock, the screw and bushing actuating on the safety lock in a manner that the safety lock is placed in the upper position when the screw is extended and it is placed in the lower position when the screw is substantially retracted into the bushing.