354

THE COLLIERY GUARDIAN.

February 14, 1913.

direction of the arrows, the governor being omitted from
this view; and fig. 3 is a transverse section of a portion of
the apparatus taken on the line 3—3 of fig. 1 looking in the
direction of the arrows. (Five claims.)

1461 (1912). Improvements in Hammer Dock Drills and in
Percussive Hammers and similar Tools. A. W. Daw and
Z. W. Daw, both of Mansion House-chambers, 11, Queen
Victoria-street, London.—This invention relates to improve-
ments in that class of hammer rock drills, percussive hammers
and similar tools in which a sleeve mounted in an extension
of the piston cylinder is employed for the purpose of
imparting an intermittent rotary movement to the tool or
bit, and is provided with grooves which are engaged by
projections on the piston rod of the drill, the essential
object being to materially diminish the length and conse-
quently the weight of this class of tools, and for which
purpose said sleeve is caused to itself act as an extension of
the piston cylinder and allow the front of the piston proper
on its forward stroke to pass into and engage the bore of
same. Fig. 1 is a longitudinal section of a hammer drill
with the invention applied thereto; fig. 2 a transverse '
section on line a—a fig. 1; and fig. 3 a transverse section
on line b—b fig. 1, but both drawn to a larger scale. (Three j
claims.)	|

7460 (1912). Improvements in connection with Wire Ropes. '
F. A. Bullivant, 72, Mark-lane, London, and G. M. Selby,

West Ferry-road, Mill wall, London.—This invention relates
to wire ropes employed in situations where they are!
subjected to heat. According to the invention, the exterior
of the rope is covered, or sheathed, with a braiding of
asbestos yarn. (One claim.)

7583 (1912). Improvements in or relating to Props or
Supports for use in Mines and similar places. J. Humble, of
Danum House, Doncaster, Yorkshire.-
this invention is to produce an improved metallic prop or j
support which can be used either alone or as heretofore ^ible, Brussels, Belgium. This invention relates to an
proposed in combination with wooden blocks, and in either »PP«atus of that type which serves for forming the shoulder
case will enable a cushioning effect to be obtained, so as to ri“* and taP6rin8 butt-end of jumpers or mining tools,
prevent injury to the prop when the superstratum or roof ’beel-azles and so forth in one operation by means of a
; compressor piston or plunger moved to and fro through the
intervention of a crank, a helicoidal wheel or any other
suitable mechanism. It is usual for the portion immediately
behind the shoulder ring to be pressed in a divided die-block
having a tapering bore or any other suitable bore so that the

gradually subsides or settles. The invention avoids the
necessity of using conical or similar shaped plugs, and
further, the improved prop possesses advantages over those
previously proposed in that it can be used in various places
where different characters of roof and floor material are to

be contended with. According to the invention, the prop is
provided with an open tubular end or ends in which an
internal diaphragm or similar obstructing member is located.
When the prop is used in some places the lower end, which
is formed as aforesaid, will be forced into the floor as soon
as a gradual subsidence or settling of the roof takes place,

and its movement into the floor will be limited by the said
internal diaphragm coming into contact with the floor
material which fills the open end of the prop. In some cases
the lower end, and if necessary the upper end, of the prop
may receive rough cylindrical blocks of timber, such as can
be obtained by cross-cutting or sawing from the trunk or
branch of a tree, which blocks become crushed to allow the
gradual subsidence or settling of the roof to take place.
Fig. 1 is a longitudinal section of one construction of the
improved prop indicated in its supporting position; fig. 2
is a longitudinal section illustrating another construction of
the prop in which a block of timber is inserted in the upper
end; fig. 3 is a similar view to fig. 2, illustrating the use of
a block of timber at the lower end as well as at the upper
end of the prop. (Four claims.)

10819 (1912). Improvements in Goke Ovens. R. S. Moss,
537, South Dearborn-street, Chicago, Cook County, Illinois,
U.S.A.—This invention relates to that type of coking
apparatus in which the air which supplies the oxygen for
the combustion of the burning gases, used to heat the retort
or oven, is continuously heated by the interchange of the
heat of the products of combustion through the intervening
walls of their respective passages. The principal object of
the invention is to provide in a coke oven a simple arrange-
ment of flues for the combustible gases, for the waste
products, and for the admission of air, all of which shall be

so arranged with respect to each other that a most general
distribution of heat around the coking chamber will be
effected, and that the air prior to its admission with the
combustible gases will be preheated without consuming an









I appreciable amount of live heat from the flues surrounding
the oven. Fig. 1 is a transverse section of an oven on
line 1—1 of fig. 3; fig. 2 a side elevation of an oven with
the walls partly broken away; fig. 3 a horizontal section on
line 4—4 of fig. 1. (Six claims.)

11831 (1912). An Improved Apparatus for Forming the

__rphe object of	PmW and Tapering Butt-end of Jumpers or Mining ,
oved metallic nron or ' Tools> Wheel-axles and so forth. E. Rorive, of 68, rue de la

14

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19

25

portion adjoining the shoulder ring, during the compressing
operation, shall assume the form of the interior of the die,
the latter forming a clamp for grasping the bar being
forged. The improved apparatus comprises the following
novel features, viz.: A stationary slotted die-carrying block
containing a divided removable die-sleeve and means for
clamping said sleeve; a covered space for supplying hot air
to the bar; a separate clamping vice having an eccentric
adjustment for the gripping jaws which serve for retaining
the bar; and a hand-operated worm and worm wheel for
driving the plunger. Fig. 1 is a longitudinal section of the
apparatus with the plunger in its starting position ; and
fig. 2 is a side elevation of the apparatus, showing the
plunger in its forward position. (Four claims.)

14293 (1912). Automatic Gatches for Retaining Tubs in
Mine Gages. L. H. Lewis, Waun Rhys Morris, Llandebie,
Carmarthenshire, South Wales, and T. H. Griffiths, Blaenau
Bach, Llandebie, Carmarthenshire, South Wales.—The
catches comprise two toothed discs the teeth of which are
alternatively long and short. They are free to turn on
pivots fixed to the cage bottom. The accompanying
drawings show a plan of the apparatus and a view of two
locks. When the two cages are in the shaft, one descending
with an empty tub and the other ascending with the full
tub, a long tooth of each disc is between each two wheels
on the two sides of the tub. The part of each long tooth
which is between the wheels, and which reaches over each
rail, comes between the ends of the arms of each pair of
right-angular locks. These locks are kept in this locking
position by the said spring. The levers attached to the
arms containing the sockets rest each in the notched end
of its corresponding horizontal bar, and the semi-circular
knobs are kept projecting out of the two ends of the cage
bottom by the springs fitted around the horizontal bars.
The knobbed ends of each short bar projects to the rail.

When the cages come to rest, one on the top and the other
on the bottom of the shaft, the projecting semi-circular
knobs, two each end of the cage bottom, are forced inwards
by coming into contact with the blocks, and therefore the

horizontal bars with their notched ends force the levers
backwards, thus turning the right-angular locks on their
spindles. The ends of the arms parallel and close to the
two rails are now out of their locking positions, and thus
leaves each long tooth unlocked. The two tubs can now be
replaced. When they are pushed out of the cages, the hind
wheels of the tubs push the long teeth before them, and
give a partial turn to the discs, which brings the alternate
short teeth to the rails. The front wheels force inwards
the knobbed short bars. Each of these knobbed short bars
lift its corresponding lever from the notched ends of the
horizontal bars, through the tapered edge being forced
under it, and thus frees one lock of each pair to return to
its locking position. When the other tubs come into their

place, their front wheels force inwards the other two short
bars, which in turn liberates the remaining open arms of
each pair of locks to return to their former locking position.
The front wheels also push the short teeth forward, and
thus bring the alternate long teeth between the wheels of
the tubs. Each long tooth is forced in between the ends of
the arms of each pair of locks, and thus retains the tub in
each cage. When the cages are again set to motion the
semi-circular knobs are forced out by the springs, and the
notched end of each horizontal bar comes directly under its
corresponding lever, and each lever is forced down to the
notched end by its spring. The short bars are kept
protruding to the rail by a spring. (Three claims.)

14952 (1912). Improvements in Reciprocating Conveyors or
Screens. B. Norton,“ Castledale,” Dudley, Worcestershire.—
This invention relates to improvements in reciprocating
conveyors or screens. In the Specification of concurrent
Application No. 16094 of 1911 there is described a conveyor
combined with means for compressing air or gas actuated
by the conveyor as it moves in both directions and arranged
so that the compressed air or gas acts to assist in accele-
rating the motion of the conveyor. The present invention
is confined to conveyors which are directly driven by the
engine, such conveyors are commonly driven by means of
an eccentric on a shaft revolved by the engine. According
to the invention a cylinder or a piston working in it is
connected to the conveyor in which cylinder air or gas is
compressed during half the forward or backward movement
of the conveyor and expands during the other half of the
backward or forward movement respectively. By these

means the motion of the conveyor can be checked in either
direction, and the motion can be accelerated by the expan-
sion of the air in the cylinder as the conveyor mnyaa in the
opposite direction. In fig. 1 A is the conveyor and B is a
fixed cylinder having a piston C, the conveyor A being
pivotally attached to the piston C by a connecting rod D.
In fig. 2 the end of connecting rod D is fixed, whilst the
cylinder B is attached to the conveyor A. In the cylinder
is a trick port E by means of which air may be supplied to
the cylinder to compensate for any loss through leakage.
In fig. 3 the conveyor A has upon it a projection F which
comes in contact with the rod G in the piston C. H is a
pipe connecting the cylinder B with an air supply maintained