Lever-type traction mechanism with adjustable, depending on the resistance of movement of the pressure of the drive wheels is used as a drive for transportation and mining machines ...

The Leningrad Mining Institute designed, manufactured and tested under production conditions at the marble quarry of the Prokhoro-Balandinskoye ore administration a friction drive for the longitudinal feed of mining stone-cutting machines of the type SM-177A. ...

An experimental sample of a friction‑driven hoist was created and successfully tested at the LGI. The hoist is moved by a special traction device with smooth drive wheels on a vertical rail made of an I‑beam.