406

THE COLLIERY GUARDIAN.

February 19, 1915.

fall out on to the conveyor belt c, c, or may fall directly into
a receipt acle; when the moulds are empty they are conveyed
round again continuously, to be filled in the same manner,
clamped, heated, and discharged, and so on automatically.
The hopper or measuring box 'is formed with V-shaped
sides, in which are formed slides s, s, and slots p, and to
which are attached guides or rails n for keeping the moulds
in place, as they follow each other their edges are thus con-
tiguous, although separated on the periphery of the drum,
so that while the moulds are made to pass down the sides
of the hopper, the action .is to drag down the material into
the mould by its own weight, while the slides (which may
be movable or fixed), under which -the moulds pass are
marked on the drawings at s, s, slips or slides over the
material in the moulds, and being slightly on the angle, it
presses the material into the mould at each side, and con-
solidates the material in the moulds; the moulds are so
constructed with relation to the above-mentioned slides that
a slight excess of material is thus filled into each mould,
so that by the .action of the rollers r, r, or a pair of clamps,
that press the moulds together, the material in the moulds
is greatly compressed and consolidated, which prevents dis-

integration and the formation of sponge by the action of
the gases that escape during the heating. In order to
facilitate the moulds in travelling down the sides of the
hopper, wheels may be formed on their undersides, and
rails also be continued through the flue or tunnel if desired,
to steady them in their journey. The moulds are pressed
together and kept tightly fastened during the time they are
heated, for the purpose of keeping their contents from the
action of the atmosphere, and also to allow the expansion
of the material itself to cause internal pressure, to give
shape, solidity, and hardness to the briquettes undergoing
formation in the moulds. (Four claims.)

3517 (1914). Improvements in Bearings for the Axles of
Colliery Trucks, Light Wagons, and the like. A. Dootson,
of 23, Adelaide-street, Hebden Bridge, Yorkshire.—Relates
to bearings for the axles of colliery trucks, light wagons,
and like vehicles where the axles revolve, and to those bear-
ings for such vehicles which have two claws or arms partially
surrounding the axle, such bearing having to be rotated in
order to be disengaged from its shaft. The invention con-
sists in arranging the bearing -so as to have a flat surface
for contact with the upper part of the shaft, by which said
bearing is capable of being swivelled or rotated in the
horizontal (or other) plane without having to be moved a

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distance from the shaft, and this flat surface also enables
the claws to extend a greater distance around, and to come
in contact with the said shaft when they are in their posi-
tions thereon than do those as heretofore constructed.
Fig. 1 is an end elevation of a portion of the framework of
a wagon showing attached thereto the improved bearing,
with a portion of the shaft which revolves within it; fig. 2
is a side elevation of the parts shown by fig. 1, as seen in
the direction indicated by the arrow a; fig. 3 is a view of
the bearing and its shaft as seen from beneath and with the
bearing in its position relatively to its shaft as when said
shaft is revolving; fig. 4 is a similar view to fig. 3, but
shows the bearing moved upon its shaft so that it may be
detached therefrom as hereinafter described. (Two claims.)

11279 (1914). Improvements in> Chucks or Sockets for
Rock Boring Drills and the like. The Hardy Patent Pick
Company Limited, of Mining Tool Works, Heeley, Shef-
field, Yorkshire; and B. Cribbin, of 10, Ingoe-street,
Lemington-on-Tyne.—Although the invention is applicable
to drilling and boring chucks of various kinds, it is more
particularly appliable to rock and coal boring drills. It
relates to means for detaching the feed or driving screw of
a coal boring machine from the drill or auger, and is of the
type in which the necessity of withdrawing or turning back
the feed screw is obviated when it is desired to withdraw
the drill or to insert another drill. Fig. 1 shows the
improved form of chuck or socket as employed between a
drill or auger, and the feed screw of a coal boring machine ;
fig. 2 is an enlarged view of the shank end of the drill or
auger; figs. 3 and 4 are a side and end view of the
improved chuck or socket, also to an enlarged scale. To

the square shank end of the drill or auger a is fitted a socket
or connecting sleeve b, which sleeve is likewise square in
cross section, and is provided with longitudinal slots, c, c,
in opposite sides. The drill shank a is provided with a pin
d, projecting on both sides, and which may be driven into
the shank after it has been entered into the said socket b,
so that a portion of the pin d projects through one of the
slots c, on each side of the socket, and forms a stop to
regulate the longitudinal movement of the sleeve b. The
end of the feed screw e .is made square to fit into the end
of the sleeve or socket b. The rotary motion of the feed
screw e is communicated through the socket b, to the drill
a, and the progressive motion of the feed screw e is com-
municated direct by the end of the feed screw to the end
of the shank of the drill a. During the drilling operation
the socket b is driven back until stopped by the pins d,

which project through the slots c in the socket b. When it
is necessary to disconnect the drill a from the feed screw
e, the socket is driven forward in the opposite direction,
until it is stopped by the pins d, when the junction between
the end of the drill shank a and the feed screw e will be
uncovered by the socket b, and the parts can be separated
by a slight lateral movement of the drill shank. By these
means it will be seen that the operation of attaching and
detaching the drill can be very quickly and easily effected
without turning back the feed screw. When the drill is
used vertically the socket may be prevented from sliding,
so as to release the end of the feed screw by employing a
fillet, key, or set screw, so as to secure the socket in
position. (Two claims.)

16437 (1914). Improvements in and Relating to Air Com-
pressors. Ateliers de Constructions Electriques du Nord et
de 1’Est, of 75, Boulevard Haussmann, Paris, France.—
Relates to improvements in air compressors of the type in
which piston valves control the inlet and delivery ports,
and open the inlet port wflien the clearance space pressure
has decreased to normal inlet pressure. According to the
invention, the piston valve is arranged to move into a
cylindrical chamber leading to the delivery outlet of the
comprasisor so that the <hoad of the piston valve
controls the opening or closing of the delivery port,
and the face of the piston valve controls the inlet



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port. The accompanying drawing is a diagrammatic
view of an air compressor with the improved valve arrange-
ment. Slide 7 produces a correct distribution when the
opening and closing points are established, according to pre-
determined clearance space volume. The clearance space
itself is a cause of thermal efficiency loss, but the advan-
tages which result by the use of a single distribution
member having a positive control, namely, a simple and
compact construction, a direct operation at high speed, the
avoidance of gearing for the control, reduced dimensions of
the comprasisor, more than compens'ate for the small loss in
efficiency caused by the clearance space. The piston
valve 7 moves into a cylindrical chamber 13 leading to the
delivery outlet 12 of the compressor, so that the head of the
piston valve controls the opening or closing of the delivery
port, and the face of the valve controls the inlet port. It
is preferable for the crank 10 of the piston valve to be dis-
posed at 150 degs. to the crank 4 of the compressor piston 2.
(Three claims.)

22654 (1913). Improved Means for Preventing Dust
Particles Escaping from Boreholes in Mines. W. Alderson,
of 24, Ward-street, Kimberley, Cape Province, South
Africa.—Relates to apparatus of the type in which a sheath
covers a drill when drilling a hole and water is passed
between the sheath and the drill from a collar, gland, or
bush provided around openings through the sheath. The
sheath, according to the invention, revolves with the drill
in the borehole. When drilling .is in operation water is
conveyed by a flexible tube (which 'is fitted on to
a union joint on the side of a stuffing box or
water collar which is fitted , on to the end of
the sheath near the socket end of the drill) and by any
desired pressure the water is forced between the outside of
the drill and the inside of the sheath from the water collar
to the neck of the drill crown. The-water, by keeping the
drill’s crown cool, facilitates drilling, and prevents dust

being made. The sheath may be made of any suitable
material, and may be attached to any kind of drill desired
by a screw nut on a split taper cap, with a rubber clasp
inside the cap. The sheath is screwed on to the fore-part of
a sleeve that revolves with the drill, and carries the water

collar, which does not revolve with the drill. The drill is
slid into the sheatli from the crown end of the sheath.
Fig. 1 is a section; fig. 2 a plan; while fig. 3 shows the
crown end. (One claim.)

25987 (1913). Improvements in and Relating to the
Operation of Centrifugal Compressors in the Unstable Region
of Working. Akt.-Ges. Brown, Boveri et Cie., of Baden,
Switzerland.—Relates to a method and means for the opera-
tion of centrifugal compressors in the neighbourhood of the
unstable region of working, wherein an inlet valve thereof
is open as soon as the pressure of the delivered fluid falls
below the pre-determined minimum, and more specifically
to compressors provided with special arrangements for
enabling them to work more or less efficiently or without
pulsation in that region. According to the invention,
throttling in the inlet pipe is prevented as far as possible,
providing a valve which .is intermittently opened and closed,
a valve controlled passage leading back from the compressor
outlet to the inlet pipe at a part shut off from the com-

pressor. In the form illustrated in the accompanying
diagrammatic drawing, the centrifugal compressor K has a
suction pipe S and a delivery pipe D. In the latter there
is arranged a non-return valve a disposed directly in the
path of the fluid delivered from the compressor to the
delivery pipe, on the spindle of which valve is mounted a
slide or valve b controlling the inlet to a branch pipe c. The
branch pipe c leads to the suction pipe S below the piston d
on the piston rod of which there are mounted two valves e
and f. The valve e opens when the valve f closes, and
vice versa. A weight j capable of any desired variation is
mounted on the common spindle of these two valves. The
suction pipe can be connected by means of the valve e and
a pipe I directly to the portion g of the delivery pipe in front
of the non-return valve a. (Four claims.)

27949 (1913). Improvements in Water Tube Boilers.
Clarke, Chapman and Company Limited, and W. A.
Woodeson, both of Victoria Works, Gateshead-on-Tyne,
Durham.—The object is to enable a greater number of tubes
arranged in a series of groups longitudinally to be employed
with drums of a given size in such a way that every tube
of each of the groups connecting a given pair of drums can
still be got at for removal and repair without it being neces-

sary to interfere with any other tube to permit this being
done, thus enabling >a larger amount of heating surface to
be provided in the same space. For this purpose each group
of tubes comprises tubes which can be fitted and withdrawn
through the correspondingly shaped manhole, and a single
series of tubes which are so arranged as, when viewed in.