CASE ELEVATOR Russian patent published in 2018 - IPC E21B19/06 

FIELD: oil and gas industry.

SUBSTANCE: case elevator consists of case, bracket, and door connected to the case. From the exposed end of the door next to its lower end wall and parallel to this wall is a groove. The door is made with an elongated end located under the groove. On the underside of the elongated end of the door there is a projection in the form of a straight triangular prism, the base of which is a right-angled triangle. The prism face, formed by the hypotenuse of the triangle is located at an acute angle to the underside of the elongated end of the door, and the small face of the prism rests against the outer wall with closed and fixed by the bracket position of the door. The height of the small face and the thickness of the door area under the groove are made with the possibility of removing a small face of the prism from the outer wall of the bracket when the elongated end of the door is bent towards the groove of this door.

EFFECT: increase of reliability and simplification of the design of the device.

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