592

THE COLLIERY GUARDIAN

September 17, 1915.

ABSTRACTS OF PATENT SPECIFICATIONS
RECENTLY ACCEPTED.

9618 (1914). Improvements in and relating to Centrifugal
Gas Washers. H. E. Theisen, of 34, Elisabethstrasse,
Munich, Germany.—Is an improvement in or modification of
the apparatus for removing solid and liquid impurities or
components from gases according to patent 22433/10, as
improved upon or modified by patent of addition No. 27696/11.
This invention relates to a further improvement or modifica-
tion, more particularly for purifying small quantities of
generator gases which are very rich in tar, the consumption
of power and water being very small, and the construction
of the apparatus as simple as possible. For this object a
disintegrator having partly fixed and partly rotating bars of
known type is first constructed laterally on the fan, and the
lower parts c of the fan vanes c1 are so . extended or pro-
longed towards the disintegrator, and arranged concentrically

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round the disintegrator apparatus, and made of such dimen-
sions, that the tar and water constituents are disintegrated
as thoroughly as possible in the disintegrator, and then centri-
fuged by the vanes c along the washing surface e1. The tar
and particles of water are separated in the catch gutters /,
whilst the almost pure gas is drawn away laterally by the
somewhat greater suctional power of the fan vanes c1. The
accompanying drawing represents different modifications in
the lower and upper halves. (Seven claims.)

16763 (1914). Improvements in Jockeys or Rope Grips
for Mechanical Haulages and the like. J. W. B. Graggs,
and W. Campbell, both residing on the property of tne
Geduld Proprietary Mines Limited, Springs, Transvaal,
Union of South Africa.—Is an improvement on the type of
jockey which is constructed with a fixed member or jaw, and
a relatively movable member or jaw between which the rope
is gripped, the movable member or jaw being operated
through the medium of a lever or its equivalent, which lever
or its equivalent is co-operatively combined with a circular
cam-shaped part, which latter engages a corresponding circular
cam-shaped part to actuate the movable member or jaw. In

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the improved construction a circular cam-shaped part is pro-
vided which is stationary relatively to the movable gripping
member, and the cam end of the lever mounted between the
said fixed cam-shaped part and the movable gripping member
or jaw. The movable and stationary cam shaped parts are
preferably so designed that after the grip of the jockey on
the rope has been relaxed, the movable jaw is rapidly moved
away from the fixed jaw to allow of adequate clearance for
the disengagement of the rope and jockey. Fig. 1 repre-
sents the jockey in side elevation; fig. 2 being an end eleva-
tion of fig. 1 from the back; and fig. 3 is a plan view of the
jockey as seen from the top. (Four claims.)

16764 (1914). Improvements in Rotary Drilling or Boring
Apparatus for Boring in the Earth's Strata. A. McNamara,
of Farm Zuurfontein, No. 369, Pretoria District, Transvaal,
Union of South Africa.—The drill is particularly applicable
for boring holes of large diameter. It is designed with a
view to rendering it readily transportable and so that little
time will be lost in performing the various operations neces-
sary with a drill of this description. Apparatus of the type to
which the invention relates comprise a drive quill to which

the drill rod or spindle is coupled, hydraulic cylinders with
pistons working therein, and connected with a cross head on
the drive quill to apply feed pressure to the drill, a drill head
or support hinged to swing around a vertical axis, and a
hoisting drum for the drill rod. The invention is mainly
distinguished by the hinging of the drill head on one of
the cylinders, the provision of a spring for transmitting the
feed pressure from the cross head to the drive quill, and the

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mounting of the hoisting drum and drill shaft. The accom-
panying drawing is a side elevation of the apparatus with
portions of the derrick broken away and showing in dotted
lines the derrick in its folded or collapsed position. (Eight
claims.)

17037 (1914). Improved System for the Operation of
Electric Winding Motors and the like. S. H. Eckmann,
of 152, Egerton-road, Whalley Range, Manchester, Lanca-
shire.—In the system according to the invention the variation
of voltage supplied to the electric motor which is employed
in operating a mine hoist, for example, is obtained in accord-

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31

ance with the well-known Ward-Leonard arrangement, in
which the field current of the generator supplying current to
said electric motor is varied in order to vary the voltage
generated as desired. The distinguishing feature of the
invention consists in arranging that the direct-current
machine shall have its excitation and speed electrically regu-
lated in accordance with the current supplied to the motor
of the motor generator set. The accompanying drawing is
one arrangement of apparatus. The current in the field
winding 17 of the equalising machine 15 is controlled in
accordance with the current supplied to the motor 1 of the
motor generator, this control being arranged so that when
the current is small, the field of the equalising machine is
weakened and the flywheel 16 therefore increases in speed
so that energy will be absorbed by the motor 15 from
the constant potential generator 5, whereas when the current
supplied to the motor 1 is large, the equaliser field is
strengthened and the flywheel 16 is caused to slow down so
that energy will be delivered therefrom to the constant voltage
generator 5. At those times when the energy required by
the winding motor 12 is below normal the equalising machine
15 will be speeded up and energy will be absorbed by the
flywheel 16, this energy being returned to the constant poten-
tial generator 5, and thence to the winding motor 12 when
the demand is greater than normal. The fluctuations in the
current supplied to the motor 1 of the motor generator will
therefore be reduced. (Two claims.)

18073 (1914). An Improved Jigging Machine for Coal.
F. Schreiber, of Gottesbergerstrasse 18, Waldenburg,
Schlesien, Germany.—Known jigging or screening machines
for dressing or screening ores comprise two separate screen-
ing beds which are influenced by a common horizontally
reciprocating piston, and in which the stream of ore moves
transversely with respect to the motion of the piston. The
invention consists in providing a new form of the above
described jigging machine, which form can be used success-
fully also for dressing coal. This new form is characterised
by the machine constituting the unit or basis element for the
construction of a new jigging machine, and also by,
two or more of such elements being connected together
and in line in the direction of the stream of coal, a dis-
charging member or shutter for each bed being inserted,
each of which members is located transversely with respect
to the piston for each element. Fig. 1 herewith gives
a perspective view of the new machine, and fig. 2 a sectional
view of a bridge and discharging device. Each of the two
coal streams to be washed moves in the direction of the
arrow shown in compartment a of the machine. Under the
simultaneous influence of the washing water, which is so
driven by the piston f that the water rises and falls over
the sieves of the three lined-up beds 1 or 2, the various
constituents of the crude coal are separated according to their
specific gravities, this being effected in such manner that
the heavy constituents, consisting for the most part of
admixtures of slate-clay, are deposited undermost on the
sieves of the first and second compartments a, b. The coal

streams first of all fill the first compartments a up to the
height of the bridge m and then, after further addition of
coal, also the compartments b. Owing to the effect of the
jigging action, i.e., owing to the stratification according to
varying specific gravities, the cleaner coal reaches the upper
layers, so that, as additional coal is passed both over the
bridge between compartments a, b, and over that between
b, c, this latter bridge being constructed as m, the coal
which arrives in the third compartments c comprises a
certain percentage of clean coal. As soon as the layers
which lie undermost in compartments a, b, and which,
bwing to the jigging action, consist of unproductive mineral
bodies with only a small percentage of coal, have reached
a certain thickness, the shutters e are raised, and conse-
quently, with the continued action of the machine, these
layers fall through the openings in the chambers below
their respective sieves, from which these bodies are dis-
charged from time to time through suitable, normally closed
openings (not shown). At a suitable moment the shutters
e are again closed. This work is so regulated that there
passes over the bridge between compartments b, c, along
with the clean coal lying quite uppermost, only such coal
as yields a percentage of ash of about 40 per cent. In com-
partments c this coal gathers undermost while the clean
coal, together with the overflowing water, passes over the
bridges at the end of these compartments. Every time the
layers which settle undermost out of the dirty coal in

compartments c reach a certain thickness, the shutters hereat
are opened for a short time. The mass of coal separated
in this way constitutes the so-called intermediate product,
which may be used for certain firing purposes, e.g., for
boiler furnaces. The above described mode of operation
applies only when coal of above 12 mm. size is treated.
With coal below this size the shutters remain continually
closed. In this case there is placed on each sieve a layer
80 to 100 mm. in thickness of crystalline felspar of 2’6 to
2’7 specific gravity and suitable size of grain. During the
jigging operation this layer of felspar obviously shares to
a certain extent the up-and-down motion, and consequently
is subjected to selective action, the consequence being that
the constituents of the coal which consist of unproductive
mineral matter gradually pass through the layers of felspar
in compartments a and b, in order then to fall through the
suitably sized meshes of the sieves into the trough, while
the intermediate product and fine coal reach the last com-
partments c where the intermediate product is likewise
sucked down by the aid of the bed of felspar. The fine
coal flows in the coal stream over the bridge at the rear
end of the third compartments. (One claim.)

17787 (1914). Improvements in or relating to Cutter
Heads for Tunnelling Machines. H. A. Recen, of 1722,
California-street, Denver, Colorado, U.S.A.—The object is to
produce a chipping, digging, cutting, and scraping effect upon
the material through which the tunnel is being excavated,
thus using a minimum of power, and expending that power
directly in the cutting operation, instead of expending a
large proportion thereof to manipulate the parts on a return
stroke, as is the case with percussion tools used in the same
connection. A further object is so to construct the head
that as the machine on which the head is mounted is moved
forward, a clean cut is formed through the entire path of

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travel of the cutter head, and any ridges which might be
left between the sets of cutting tools comprising the head
are removed. The invention comprises a cutting head,
including a central drive shaft, discs mounted thereon to
turn therewith, pins supported at their opposite ends in two
of said discs, hammers pivoted upon the pins and adapted
to operate by centrifugal action, a support for the shaft and
brackets extending from said support in such a manner that
the hammers in action extend out beyond the support. Fig. 1
is a plan view with parts broken away to more clearly illus-
trate the construction of the head; fig. 2 is a view in end