PULLING DEVICE AND METHOD THEREFOR

摘要

A puller is provided with a number of advantages. Pullers are described that have a high power to weight ratio, and a high power to volume ratio. Examples of pullers and pulling systems include configurations that provide high cable friction in a small device volume. Examples of pullers and pulling systems also include constant force pulling which is desirable in particular for small diameter pipe replacement. Using pullers and pulling systems as described, minimally invasive pipe replacement operations are possible. Reversible pullers are also provided that decrease the amount of time needed to burst or split multiple segments of pipe.

主权项

1. A pulling device, comprising:
a pair of drums, each drum being driven by a corresponding motor and gear reduction system; and an intermediate roller fixed at a location and orientation between the pair of drums, to guide a flexible line between the pair of drums; and a puller body that substantially encloses the pair of drums, and the intermediate roller, wherein the puller body includes one or more openings sized to allow the flexible line to access the puller body.