A simple, and reliable low investment, light weight drilling technology for boreholes. Primarily used for unconsolidated materials, it will drill any material, including rocks, boulders, cobbles, or large gravel. Requires no mud, mud pits, mud pumps, tanks, drill rods, hammers or compressors.

Trailer-tripod Shell & Auger drilling differs slightly from other percussion drilling methods because a powerful winch enables tools with cut materials to be pulled out that have been deliberately embedded, driven by heavy sinkers allowed to free-fall under gravity in the hole - see the video below. The rig can install and recover temporary steel casing. Several sizes of casing can be used in the same hole, as may be required by conditions.

It is a non-invasive and sensitive drilling method, allowing discovery, testing and water development, as progress is made. It is an appropriate method for water wells, for mineral prospecting, site investigation and remediation. This rig will drill to 125 metres (410 feet) with the standard winch drum - depending on the conditions and sequence of strata.

At only 450 Kg (1000 lbs), this light machine can be man-handled on its own wheels to places which would be inaccessible to heavier equipment. It is both helicopter and canoe portable.

VIDEO: showing setting up the rig and cable percussion drilling
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Rugged high quality rigs made in England with very low inputs - quick two man set-up and operation; they cover the entire range of materials, with nothing extra to buy if the ground is harder than you thought. Machines are permanent, long life and maintanable.

Designed and built in the UK for use world-wide. At their heart is the highly successful Consallen design of clutchless freefall drilling winch, powered by either direct drive engines or by hydraulic power. Winches are available either built into rigs or stand alone.

WINCH details of both direct drive and hydraulic drive

They are suitable equipment for drilling contractors drilling water wells, site investigations, window sampling, remediation wells, drainage holes, cleaning & bailing and environmental drilling. Can be used for setting drive points, hydraulic (jet) percussion drilling, peizometers & insitu testing, geothermal drilling, and prospecting.

PERFORMANCE of drilling rigs is a combination of the machinery, tools & equipment, materials to be drilled, proper planning, and operator skill. In suitable conditions the Forager-55/1250 can provide boreholes with 8-inch casing to 15 metres; with 6-inch casing to 60 metres and with 5-inch casing to 90 metres. Open hole drilling to 145 metres has been achieved below 90 metres of 5-inch casing. The fully braced tripod can lift 9,000 Kg.

MOVEMENT The Standard Forager-55 rig weighs about 500 KG and when folded, can be towed by a small car or pickup, and is easily towed off road in conditions which would be impossible with heavier machines. It is light enough to be man-handled to most locations, and the winch can be used to pull it into extreme places.


When driven HYDRAULICALLY, using our High-Low Power Pack the winch can have at least 2 speeds and hoist capacities, and provides both power up and power down, while retaining the free-fall facility. When the tools are light, high speed is available, but when pulling stuck tools or casing a slow speed at maximum pulling capacity is immediately available, providing a sustained bare drum tension of 3,000 Kg.

The safe mode of operation allows the driller to carefully control tools as they enter or are withdrawn from the drilled hole, or are presented for emptying, in a manner that is safe for both helper and driller; it also allows safe powered rig erection. The change-over between operating modes is immediate, and can take place at any time. Hydraulic drive allows the use of maximum available hoist - even while stalled - with no wear to the brakes. The safe mode even allows one-man operation of the rig and equipment.

Other equipment may be powered using a secondary hydraulic circuit, including casing jacks, casing rotator (solid stem auger driver and kelly drive & rotary table).
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The picture shows a rig folder for towing, (total weight 500 Kg - 1100 lbs) with a demountable wheeled Power Pack. After erecting the rig, the unit can be rolled off the platform. Using the rig with the power unit at a distance provides the driller with a better working environment - it can always be positioned down-wind. This feature is demonstrated in the video clip below.

Here is a short VIDEO clip showing the hydraulic version at work: http://www.consallen.com/Polsted-Clip-3.wmv


Consallen Group Sales Ltd., P.O. Box 2993, Sudbury, Suffolk CO10 0ZB, UK.
Tel: +44-(0)1787-247770; Mobile, or you may send an SMS (text): +44(0)7724 687498; e-mail: sales@consallen.com