| • |
Completely
pneumatic operation with lower initial and upkeep costs than
with a hydraulically operated boom. |
• |
Any
model of jackleg-type drill can be mounted on the LONG TOM.
An adapter, designed for the type of rock drill to be used,
is bolted to the feed piston rod of the LONG TOM.
|
| • |
Special
rail or crawler jumbos can be designed to mount LONG TOMS
to drill any size of heading. These can range from a simple
two-LONG TOM jumbo for a 6' x 8' drift, up to a multiple-deck
until with 15 LONG TOMS for a 30' x 30' heading. |
• |
The
LONG TOM can be easily mounted (with 4 bolts) to any number
of machines available in a mining operation, such as: mucking
machine, ScoopTram, ore car, flat car, locomotive, jeep, etc. |
| • |
The
mounting plate of the LONG TOM is swiveled so that the whole
unit can be swung through an arc of 90° each side of centre
line for horizontal coverage of the drilling face. |
• |
The
gooseneck design of the LONG TOM feed piston allows positioning
of the rock drill at any angle for proper hold alignment.
If, for example, flat lifters are required, the gooseneck
can be rotated 180° and the rock drill operated in an
upside down position. |
| • |
The
vertical positioning of the LONG TOM is controlled by a diaphragm
valve located at the front end of the machine. The driller
adjusts this valve so that the air pressure in the balance
cylinder supports the weight of the LONG TOM, rock drill and
drill steel on a cushion of air; a push, with one hand, will
then move the unit vertically into position for collaring
the hold. Once the hold has been drilled to a depth of 8"
to 10" the LONG TOM will maintain the alignment and rate
of penetration as set by the miner... and will drill the hold
to bottom, unattended. |
• |
A reversing
valve on the LONG TOM feed piston performs two functions:
(a) with the valve in the "forward position",
the feed piston pushes the rock drill ahead. The rate of
penetration is governed by the setting of the feed control
on the backhead of the rock drill.
(b) with the valve in the "retract" position and
the feed control of the rock drill in the full open position,
reverse air pressure is applied to the LONG TOM piston to
retract the rock drill and steel from the hold.
|
| • |
Because
of the self-supporting feature of the LONG TOM, the miner
does not have to hold the machine while the hole is being
drilled. This reduces the physical effort required by the
miner and also frees him to perform other functions, such
as changing bits or mucking bottom. Several mining and contracting
companies have taken advantage of this "unattended drilling"
feature and use two drillers operating three LONG TOMS to
drill off the round. |
• |
The
9' feed of the LONG TOM gives uninterrupted drilling from
hole collar to bottom with one length of steel. If two changes
of steel are used, the fact that the LONG TOM is self-supporting,
air-power retracted and air-power fed makes steel changing
a simple operation. |
