PAD DRILLING UNIT Russian patent published in 2014 - IPC E21B15/00 

FIELD: machine building.

SUBSTANCE: pad drilling unit includes derrick headboard with a base, a module located as skidding system, support with rails and guides with incrementally arranged holes, hydraulic power cylinders of travel. The hydraulic power cylinders are connected with the base and are provided with an attachment device. The attachment device is made with the side top hitches and with a possibility of sliding along the guide. The attachment device is provided with two stops. In this case the stops are located in opposite positions with respect to each other and are spring-loaded to the guide. One end of the stop has a possibility of interacting with the guides and holes and is made at the angle to the guiding surface. The derrick headboard and the skidding system modules are provided with wheel pairs interacting with rails. The guides are made in the form of the rectangular protrusion of supports. The attachment device of the hydraulic power cylinder is made in the form of U-shaped element to mate with the guides and is provided with an additional stop.

EFFECT: simplification of attachment device design and increase of reliability of its attachment.

3 cl, 7 dwg