leidkop for a device to give it a shot in a stretch of mountains and zwaarstangen population.

摘要

A pipe guide head for well pipe racking apparatus has plural slides defining different sizes of pipe receiving guide openings, extensible from retracted positions within the body to extended positions for receiving pipe, each slide being connected with a lever arm pivoted on the body to close the lever arm across the pipe opening upon extension of the slide and open the lever upon retraction of the slide. Fluid pressure operated actuators are connected with the slides to extend and retract them.