E-trac tractor device and method of use

Abstract

A compact flexible lance propelling drive device is disclosed that is mountable on a pipe end or may be configured on its own integral tubular frame. The device includes a motor driven gearworks contained in a main gearbox and two sets of roller assemblies configured in a side-by-side arrangement and connected to and selectively driven by the gearworks. Each roller assembly set comprises an upper and a lower roller assembly configured in a fixed vertical arrangement, wherein each roller assembly comprises an adjustable split-sheave configuration that includes a first roller half having a first contact face and a second roller half having an opposing second contact face and a means for independently closing a gap between the first and second roller halves so that the opposing contact faces of said first and second roller halves engage the surface of said flexible lance, clamping the flexible lance between the upper and lower roller assembly.

Dependencies are inferred from the claim text.