| Description |
Drill, Rock, P.E.D. (Atlas Copco) |
| Manufacturer |
Atlas Copco |
| Model |
Cobra |
| Type |
BBM 47L |
| Use |
Petrol driven rock and road breaker |
| Fleet Number |
|
| Date of picture |
1966 |
ROCK DRILL, P.E.D. (ATLAS COPCO "COBRA")
Application
For drilling holes for the placing of explosive charges in rock, concrete
etc., and for light concrete breaking. Used in situations inaccessible to an
air compressor or where the use of an air compressor and pneumatic tools is
not justified.
General description
A self contained rock drill which can be converted to a light breaker by the
interchange of three small parts. The machine is powered by an integral 70
c.c. two stroke petrol engine and is supplied complete with drill rods 1ft.,
2ft., 3ft., and 4ft., long, rip bits of 1 and 3/8in., 1 and 1/2in. and 1 and
3/4in. diameter, a chisel point breaker steel, flexible exhaust extension
hose, maintenance tool kit and instruction manual. The drill and its
accessories, other than the longer drill rods and the exhaust extension hose
are contained in a stout wooden case for transport and storage purposes.
With the motor running the operation of both rotation and
striking mechanisms can be shut off by the operation of an "idling" lever
thus assisting accurate positioning of the drill steel. This facility is
inoperative when the machine is used as a breaker.
Drill and breaker steels having a shank size of 7/8in.
hexagon x 4.5in. long are used.
Weight
53 lb.
Fuel
Petrol/oil mixture (1 part oil to 16 parts petrol, cylinder, Motor cycle).
Capital cost
£216.
Remarks
Conversion of the machine from drill to breaker operation takes about ten
minutes. Due to the light weight and small engine the "Cobra" is, in
general, only suitable for light breaking work, e.g. concrete footways etc.
Tungsten carbide tipped drill steels are available if
required for drilling in granite and other hard rock.
