200

THE COLLIERY GUARDIAN.

January 24, 1913.

ABSTRACTS OF PATENT SPECIFICATIONS
RECENTLY ACCEPTED.

6202 (1912). Improvements in and connected with Rock-
drilling and the like Apparatus. J. Kubat, of Kladno,
Bohemia.—This invention has reference to rock-drilling and
the like apparatus of the type wherein the drill is pivotally
mounted on a member which is slidable upon its support,
and also to that type of drill in which the outward or
striking movement thereof is effected against the action of
a resilient cushion. The invention is an improvement in
or modification of the invention claimed in specification
No. 24553 of 1911, and the object thereof is to provide an
apparatus for rock drilling and like purposes in which an
efficient working of the drill is ensured, and also in which
the drill may be readily adjusted to meet all requirements.
According to the present invention, a modified form of the
drilling apparatus described in specification No. 24553 of
1911 is provided, in which the drill is mounted upon the
supporting lever in such manner that it is capable of



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movement about a slidable pivoting point, and the crown of
the drill is adapted to be thrown back from the face of the
rock or the like after each blow through the medium of
resilient means in the crown of the drill or on the stem
thereof. Figs. 1 and 2 are respectively a side elevation and
a rear elevation illustrating one form of percussion drilling
apparatus according to the invention. Fig. 4 is a detail
section of one form of drill head. When carrying out the
slotting operations on the face of the working, the upper
end of the supporting lever is guided along the wall of the
working or gallery by means of the guiding wheels or
rollers. When carrying out holing, cutting or marking
operations the upper end of the supporting lever is anchored
to the left and right by means of weak chains having elastic
insertions, and attached to a weight or the like steadying
device placed on the ground on either side of the apparatus,
by which means the supporting lever is prevented from
tilting or rocking sideways. (Three claims.)

13084 (1912). improvement in Briquette Machines. J.
Liddle, 154, St. Vincent-street, Glasgow, Scotland. (Com-
municated by St. Louis Briquette Machine Company, the
Security Building, St. Louis, State of Missouri, U.S.A.).—
This invention relates to briquette machines of that type in
which the material to be formed into briquettes is delivered
from a hopper against a vertical revolving mould carrier,
provided with moulds within which the briquettes are

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compressed by suitably actuated plungers. It is an object
of this invention to provide in such a machine improved
means for delivering the material to the moulds, improved
compressing plungers, and improved means for cooling the
machine. Fig. 1 is a side elevation, partly in section, of this
improved briquette machine; fig. 2 is an end elevation,
partly in section, of said machine; fig. 3 is an end view of
two plungers; fig. 4 is a sectional view through one of the
plungers ; fig. 5 is a detailed view of the yielding section of

one of the cams, taken in line 5—5 of fig. 6; fig. 6 is a side
elevation of the plunger carrier. As shown in figs. 1 and 2,
the feed-box containing the material to be formed into
briquettes is arranged in a known manner above the mould
carrier 15. The side walls of the feed-box are provided with
bearings adapted to receive rotatable shafts carrying
agitator blades 6. The working faces of the agitator
blades 6 are not radial, but are disposed at an angle to a
radial line passing through the axis of rotation. This has
the effect of causing the blades to exert their pressure in
the most favourable direction for forcing an adequate
supply of material into the mould. In this connection it
should be noted that the driving mechanism causes both
the agitator blades and the mould carrier to rotate in a
clockwise direction, as indicated by the arrow heads in fig. 1.
Each of the blades 6 at the lower portion of its stroke is,
therefore, moving in a direction opposite to that in which
the upper portion of the mould carrier is advancing. After
the material has been forced into the moulds, as above
described, the plungers 18, mounted in their plunger heads
19, are shifted in known manner by means of the cam tracks
23 for the purpose of compressing the briquette, and of
transferring it into alignment with the discharge opening
17. That end of the plunger 18 which is opposite to the
working face is provided with a reduced threaded portion
adapted to be screwed into the plunger head 19. When the
working face of the plunger becomes worn the plunger may,
therefore, be unscrewed from the plunger head to permit of
re-shaping the worn working face. To reduce the friction
between the stationary cam track and the moving plunger,
the plunger head 19 is provided with a roller 21, rotatably
mounted on the pin 22, and adapted to bear against the cam
track 23, As considerable heat is evolved in the process of
compressing the briquettes, a circulation of cooling water is
provided. As shown in fig. 2, the rotating mould carrier has
an inwardly extending flange 15c communicating through a
plurality of openings 15b with the hollow interior of the
mould carrier. On the side opposite to the inwardly-
extending flange 15c is a somewhat similar flange extending
outwardly in close proximity to the discharge openings 15d.
(Three claims.)

16092 (1912). A Process of Briquetting Flue Dust and
Product of said Process. R. Htibner, of Farm Friedenau,
Arlington, Vermont, U.S.A.—This invention consists in a
process of treating flue dust containing iron, whereby there
are produced porous briquettes, which are sufficiently strong
to bear the weight of the column of material in the blast
furnace where they are intended to be employed, and
sufficiently tough or resistent to break down only under
such a temperature as is necessary to separate the iron from
the bearing ore in the furnace. To carry the invention
into effect there are taken: Fluedust, containing iron 90
per cent., 60 parts ; carbon, 10 per cent, by weight,
alumina clay, 7*5 parts ; silica, 8 4 parts ; lime, 10 parts;
magnesia, 3 5 parts. These materials are thoroughly mixed,
after which there is added a mixture of hydrofluoric acid
0*6 part with water, sufficient to convert the materials into
a stiff plastic mass, after which such mass is introduced into
any suitable briquetting machine and formed into briquettes.
The percentage of hydrofluoric acid employed will depend
upon the amount of iron contained in the fluedust—that is,
the hydrofluoric acid will be increased as the percentage of
iron is decreased. Further, the percentage of hydrofluoric
acid may be from 0 6 parts to 5 parts by weight. Further,
the percentage of silica will depend upon the amount of
silica contained in the fluedust or associated with the
alumina clay. The introduction of the hydrofluoric acid
produces a chemical combination between the silica and
the calcium, and silicon fluoride and calcium fluoride are
formed. When the briquettes are introduced into the
furnace, and subjected to the temperature of the furnace,
the presence of the hydrofluoric acid produces a basic slag
which is more fluid than the usual slag derived from a blast
furnace. The slag so formed readily separates from the
iron carried by the briquettes, and thus facilitates the
smelting. (Two claims.)

28177 (1911). Improvements in and relating to the Manu-
facture of Explosives.—A. T. Cocking and Kynoch Limited,
all of Lion Works, Witton, Birmingham, Warwickshire.—
This invention has for its object to provide an improved
method and means for the desiccation and also the digestion
and treatment generally of plastic explosives. It consists
in a method in which the material is subdivided by causing
it, by a difference of pressure between the opposite ends of
a plurality of passages, to pass through the same, and is
warmed while in these passages by a heating medium
surrounding the walls of these passages. In carrying this
invention into effect in one form, an apparatus is provided
consisting of two juxtaposed chambers communicating
through a large number of small tubes, which are jacketed
so as to allow of heating medium at any desired temperature
(e g , 50degs. Cent.—55 degs. Cent, where blasting gelatine
is to be freed of small quantities of water) being circulated
about the same. The chambers, which are also jacketed, are
arranged to be capable of evacuation in turn as desired.
The material is placed in one of the chambers, the other
being then evacuated. Owing to the low viscosity of the
colloid, the latter is drawn through the tubes in a finely
divided form, and a large surface of it is thus exposed to the
warmth and to reduced pressure to cause rapid drying

where this is desired. It is preferable to provide means for
ramming the material to keep it in a compact mass and
prevent the formation of air channels, which would cause
loss of pressure and reduce or interrupt the flow of material.
If necessary, the connections may be reversed when the
material has passed through the plate, and by reduction of
pressure in the other chamber the material may be returned,
this operation being repeated as often as may be necessary.
(Four claims.)

28178 (1911). Improvements in and relating to the Manu-
facture of Explosives. A. T. Cocking, and Kynoch
Limited, all of Lion Works, Witton, Birmingham,
Warwickshire.—This invention relates to the manu-
facture of blasting gelatine—that is, the product resulting
from the incorporation of soluble nitro-cotton with nitro-
glycerine, the amount of the latter being over 90 per cent,
of the product. It has been observed that a method which
has been proposed for the incorporation of nitro-cellulose
with nitroglycerine without drying the former if used to
incorporate small proportions of nitro-cotton in nitro-
glycerine in making blasting gelatine, produces relatively
complete dissolution of the nitro-cotton in the nitro-
glycerine and gives a product requiring but little further
treatment, if any, to secure the desired homogeneity. Thia
previously proposed method consists in bringing the nitro-
cellulose, while still wet, into contact with the nitro-glycerine.
The invention consists in the employment of this method to
dissolve the nitro-cotton in the nitroglycerine in the pro-
duction of blasting gelatine. The invention further consists
in using reduced pressure to subdivide the material into
sheets, cords or the like in order to expose it to the action
of warmth and reduced pressure to remove water more or
less tenaciously retained by the product. In carrying this
invention into effect in one form the nitro-cotton still
containing, say, 20 to 30 per cent, of water, is directly mixed
with the desired amount of nitroglycerine preferably at a
temperature of 40 degs. to 60 degs. Cent., a jelly-like
product resulting. In order quickly to remove the water,,
which is not easily separable by mechanical means, it is
desirable to subject the product to treatment as referred to-
in Application No. 28177 of 1911. (Two claims.)

28603 (1911). Improvements in Bearings for Mounting-
Wheels on Axles. Bergische Patentachsenfabrik G.m.b.H.,
of Wiehl, Rhineland, Germany.—This invention consists of
a bearing for carriage wheels, according to which the bush
or axle box is secured to the axle by means of balls, which
are seated in a circular groove provided on the axle and lie
against a suitably excised part of the bush. The opening
through which the balls are introduced is closed by meana

of a cap that is put on to the outer end of the axle. Thia
cap, which surrounds like a cage the side of the balls oppo-
site the end of the bush, prevents the balls from coming out
of place, even when, after considerable wear has taken
place, the bush comes so far away from the balls that the
latter might come out of the ball race. The bearing is>
illustrated byway of example in the accompanying drawing.
(One claim.)

28625 (1911). Apparatus for Indicating, Measuring and
Recording Minute Changes in Barometric Pressure. G. J.
Gibbs, of 7, Lune-street, Preston, Lancashire.—This inven-
tion has for its object an instrument or apparatus for
showing, indicating and measuring minute changes in the
barometric pressure of the atmosphere, and for recording,
such changes. Fig. 1 shows a side elevation of one form of

the instrument, fig. 2 a side elevation of a modified form of'
the instrument, fig. 3 a side elevation of the instrument as
arranged for obtaining autographic records of minute
changes in the barometric pressure; fig. 4 is a sectional
elevation of the same, the section being taken on the line
5—6 of fig. 3. In fig. 1 A is a hollow vessel, usually of
glass, containing air at atmospheric pressure; B is a straight
glass tube communicating at one end with the interior ofr