CASE ELEVATOR Russian patent published in 2011 - IPC E21B19/06 

FIELD: gas-and-oil producing industry.

SUBSTANCE: case elevator consists of case, of flap connected to case, of bracket, of latch with locking tooth and of spring prop. The bracket is connected to the case and is made in form of a strap of "П"-shape with ears and a protective frame welded to it. The spring prop consists of two springs and is positioned on axis of the bracket, also, one end of each spring rests on the case of the elevator, while another end rests on a lever of the latch.

EFFECT: improved ergonomics of operation; safety, reliability and increased service life.

3 dwg