1016

THE COLLIERY GUARDIAN.

May 14, 1915.

full and empty; the lowering of the full draws up the
empties. The length of the run is 1,200ft., and the
time taken for each trip 3| minutes, including banking.
The maximum dip of the incline is 18 degs.; the bottom
of the incline makes a complete bend, the trucks being
delivered on to a cross-cut adjoining the main double
parting at the end of the main and tail haulage. Six
hundred tons per day of eight hours is handled by this
incline.

(4) Stationary Engines. — These are applied to haul
the trucks by ropes, which may be done with any

1,200 ft. | in. steel rope, single reduction, spurred gear-
ing, from three-phase 250-horse power motor, running
at 720 revolutions per minute. Designed to haul a train
of six trucks, each weighing 12 cwt., and carrying
2,2401b. of ore, on a maximum gradient of 25 degs. at
1,000ft. per minute, and capable of lowering fulls down
incline by brake.

The first type lowers the rock down hill to the level
below, handling up to 400 tons per shift. The second
type hauls the load up hill to the level above, handling
about 300 tons per shift.

which is coiled on another drum, is attached to the outer
end of the train, and is thus drawn in, so as to be ready
to haul out the full train with the tail rope attached to
inner end. This system only calls for a single road,
except at the picking up and delivery ends. The two
drums, are thrown into gear and out of gear separately
by means of clutches. When one drum is in gear and
worked by the engine, the other drum is out of gear and
runs round loosely, allowing its rope to be served out,
but it can be braked if necessary. The main rope is
the rope which hauls the full train out, but, though it is

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Fig. 2.—Details of 20 Cubic Feet Mining Truck.

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Fig. 3.—Detail of Truck Coupling.

(Francis-Philip’s Patent.)
Weight, 431b.; breaking strain, 44’8 tons.

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Fig. 4.—Shaft and Gun.

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Fig. 5.—Plan of 3/2 Self-acting Machine.
minutes per trip ; maximum dip, 18 degs. ; ength of run, 1,200.

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gradient; the arrangements are varied to suit the con-
ditions. Two typical ^types of single rope hauling
engines are described as follows :— ■->

(1)	Sandycroft twin cylinder, Ilin, by 20 in. stroke,
double drum, geared 3 to 1. Diameter of drum,
3 ft. 6 in., carrying 1,800ft. of lin. rope, capable of
hauling 8 to 12 cwt. cars, each carrying 2,2401b. of ore
up a gradient of 20 degs. at 500 ft. per minute.

(2)	Geared electric winch, supplied by Fraser and
Chalmers, single drum, 42 in. by 24 in. wide, taking

These single rope and main and tail rope systems are
often worked in conjunction with each other. The tail
rope, which is twice the length of the haulage road, is
attached to one drum, passes right along the side of the
road, supported by rollers, and then around a large
return sheave at the end of the in-bye end of the haulage.
The diameter of this sheave depends on the size of the
rope, and is in this case 6 ft. The rope returns on
rollers in the 'middle of the roadway. By this rope the
engine hauls in the empty train, and the main rope,

called the main rope, it has in this case lighter work
than the tail rope, as the road has a slight dip towards
the shaft, in favour of the load, to allow for drainage.
The rollers in the middle of the road are placed 22 ft.
apart. It is very important that the rollers for carrying
the ropes should be of large diameter, and kept clean and
properly oiled. Attention to a detail of this kind is of
great importance to the success of running the haulage,
and to the wear and tear of ropes. The rollers that
are now giving great satisfaction are of a patent self-