Improvements in Mining Machines.
Year: 1895

page_text: Date of Application, 2nd Apr., 1895-Accepted, 3rd Aug., 1895
Improvements in Mining Machines.
We, JOSEPH BOLAND, of No. 10, 3rd Avenue, and GEORGE WILLIAM FRITZ,
of Vandor Street, Inventors, and HUGH FRANCIS DORIS of 3436 Forbes Avenue,
and JOHN JONATHAN MCCLOSKEY, of 2034 Center Avenue, Promoters, all of
Pittsburg, in the County of Allegheny and State of Pennsylvania, United States
of America, do hereby declare the nature of this invention and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement:-
Our invention relates to improvements in mining machines, and it consists in the
construction and arrangement of devices which will be fully described hereinafter
and particularly referred to in the claims.
In the accompanying drawings:
:―
Figure 1 is a plan view of a mining machine which embodies our invention
complete.
Figure 2 is a side elevation of the same.
Figure 3 is a front end elevation of the same, with the cutters removed.
Figure 4 is a plan view of the inner face of the upper cutter.
Figure 5 is a sectional view taken longitudinally through the centre of the
cutters.
Figure 6 is a detached view of one of the endwise movable frames.
Figure 7 is a detail view.
A indicates a horizontal rectangular framework or bed, upon which the operating
parts are supported, and in which some of them move endwise as will hereinafter
fully appear. Extending transversely across this frame are the two bars B upon
which the electric motor or other power C is placed. The driving shaft D of this
motor extends forward and carries a pinion E, which meshes with a cog wheel F,
rigidly attached to a longitudinally extending shaft G, supported in suitable
bearings upon the standards H.
Journaled between the front standard H and the standard or bearing I, are the
two large cog-wheels J, which intermesh with each other as shown in the end
elevation Figure 3, and a pinion K upon the forward end of the shaft G, which
meshes with one of said cog wheels J, through the medium of which they are
revolved.
The ends of the framework or bed A. are provided with the openings L, which
are provided with the lugs M, and at each side of the frame A are the two end wise
moving cutter frames N which consists of parallel bars as shown, which are connected
by head pieces P, which are provided with grooves to receive the lugs of the frame,
forming a bearing therefor.
A cross bar Q connects the said endwise moving frames, and this cross bar has
attached to its under side a screw nut R through which a screw shaft S passes.
This shaft S has its ends journaled in blocks placed in the ends of the frame A,
and is prevented from having any endwise movement whatever, while it is permitted
to freely revolve as and for the purpose presently to be described.
Shafts T have their rear ends journaled in the rear head pieces of the endwise
moving frame and are provided with collars a, and the front ends of the said shafts
are journaled in the cross heads or sockets b, which are securely attached to the
forward extremities of the said endwise moving frames. These sockets or heads b,
are provided with the lower sockets c, or spindles, upon which the lower cutter d is
journaled and held in place by means of a screw and washer as clearly illustrated.

page_text: at e. The upper spindle c, is at an incline for the purpose of supporting the upper
cutter at an incline to bring its forward periphery in contact with the periphery of
the said lower cutter. The upper cutter is provided on its periphery with a series
of cogs, which mesh with the cogs g, upon the periphery of the lower cutter, so
that the lower cutter is revolved by the upper cutter, the latter being revolved
through the medium of a pipion h, secured to the shaft, which meshes with the
cogs i of the upper cutter. The lower cutter is provided with a circular groove j
in which the said pinion h freely, revolves without interfering therewith.
Attention is directed to the fact that the lower cutter is flat or straight on its
outer or lower surface, so that it cuts an even floor in the mine, while the upper
cutter is convex on its outer surface, so that only its front half cuts, the rear half
of said cutter being entirely cleared by the forward half, so the machine is driven
with less power and all choking is absolutely avoided. The cutters k are attached
to the outer sides of said wheels in any desired manner, and extend beyond the face
thereof to make a clearance, and in the upper cutter the knives extend above the
screw which holds it in place to make a clearance thereof, all of which is clearly
illustrated and will be readily understood.
The endwise moving frames are guided by meaus of the guiding rods and m,
and by means of the lugs p, which extend into slots formed longitudinally in the
frame A. The outer lugs of the said frames are provided with outwardly extending
cross heads n, which extend into the said longitudinal slots of the frame, A, all of
which form a very rigid and permanent guide for the said frames.
q
The large cog wheels J, are revolved by the shaft G, as before stated, and
intermesh, and they in turn, engage. the pinions r, which are upon the shafts
journaled in the end wise moving frames and which revolve the said cutters. These
pinions are provided with feathers &, that engage key ways t of the said shafts, so
that the shafts are permitted to pass freely end wise through them, and the pinions
are themselves prevented from having any endwise movement by means of flanges u
(Fig. 7), which engage opposite sides of the said large cog wheels J.
The speed gearing consists of a pinion 2 which is loosely placed on the inner end
of shaft 3 of one of the large cog wheels J, and held in place by means of suitable
collars against lateral movement, and also placed on this same shaft is another
loose cog wheel 4, larger in diameter than the pinion, or cog wheel 2. Between
these two wheels, is a sliding clutch or collar having lugs, which engage, lugs upon
the inner. sides of the said wheels 2 and 4 when moved in, contact therewith, the
said clutch having a feather moving in a key-way of the said shaft 3. This clutch
arrangement is the usual construction of such arrangements, and need not be more
fully described. Parallel with this shaft 3 is another shaft 7, upou, which a loose.
wheel, 8 is placed at its outer end, the said wheel being. held against, lateral move-
ment by means of a collar in the usual manner in such constructions, and at the
other end of the said sbaft 7 are the two wheels 5 and 6 which are made fast to
each other. The cog. wheel 6, meshes with the pinion. 10. secured rigidly to the
screw, shaft S, and the loose, wheel 8 meshes with the pinion, 9. which is also fast
upon the said screw, shaft, and smaller in diameter than the pinion 10. An idler
cog-wheel 11 meshes with the pinion, 2, upon the shaft. 3, and this idler. in, turn
meshes with the cog wheel 5.
The clutch 12 is moved back and forth through the medium of a lover. v, for the
purpose of either throwing out entirely the speed gears, or. for the purpose, of
throwing into, operation, either.the slow or fast train:
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed we declare that what we
claim is
13.
1. A mining machine, comprising a cutter. having a straight outer cutting surface,
a cutter having, a conical outer cutting surface, and set obliquely to said straight
faced cutter and meshing. therewith, and a driving. shaft driving, one, of said
cutters, substantially as specified.

page_text: 2. A mining machine comprising a lower cutter having a straight under cutting
surface, an upper cutter having a conical upper cutting surface, said conical cutter
set obliquely to the straight cutter and meshing therewith, a carriage or frame
for said cutters travelling in a plane parallel with the straight cutting surface of
the straight cutter, and a shaft carried by said frame engaging and driving one of
said cutters, all combined to operate as and for the purpose described.
Dated this 2nd day of April 1895.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.