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Патент USA US2105505

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Jan. 1s, 193,8. `
E. RAMs/w
2,105,505
MINING MACHINE
Filed May ll, 1936
'7 Sheets-Sheet l
ATTORNEYS
Jan. 18, 1938.
E. RAMSAY
2,105,505
MINING MACHINE
Filed May I1, 195e
'I sheets-sheet 2 '
INVENTOR
y
'
ATTORNEY
Jan. 18, 1938.
E. RAMSAY
2,105,505
MINING MACHINE
Filed May ll, 1936
7 sheetsfsheet 5
NVENTOR
m4,?,
ATTORNEY
Jan. 18, 1938.
E. RAMSAY
MINING
MACHINE
Filed May 11. 1956
Q5
‘Si
2,105,505
-
'
'ï Sheets-sheet 4 -
Jan. 18, _1938. - '
E, RAMSAY
‘
2,105,505
MINING MACHINE
WM
ATTORNEY
Jan. 18, 1938.
E. RAMSAY
2,105,505
MINING MACHINE
Fi'led May 1l, 1936
'7 Sheets-Sheet 6
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Jan. 18, 1938.
E. RAMSAY
2,105,505
MINING MACHINE
Filed May 11, l936
'7 Sheets-Sheet ’7
INVENTOR
¿Rs/fl N: RAMs/:Y
BY
WV
ß
ATTORNEY!
Z,i05,505
Patented Jan. 18, 1938
hä
UNITED ST
2,105,505
MINING MACHINE
Erskine Ramsay, Birmingham, Ala.
Application May 11, 1936, Serial No. '79,095
18 Claims. (Cl. MS2-_9)
My invention relates to a mechanism for carry
ing into effect a novel mining system, wherein the
face of the mineral to be mined is removed by the
requisite number of saws in relatively thin slices,
5 the saws moving in a plane parallel with, and
juxtaposed to, the face so that the mineral slab
as it is sliced oiî is weak enough to break away
l
in iront of the advancing saw shafts and iall with
out being handled onto a conveyor by which it is
loaded into mine cars.
More particularly, my invention discloses mech
anism for carrying into eiîect the mining method
which forms’the subject matter of my pending
application, Serial No. 39,707, ñleol the 19th day
15 of September, 1935.
’
My present invention has in view the provision
of a self Vpropelling slicing machine comprising the
requisite number of saws according to the thick
ness of the seam being mined, which saws have a
cutting capacity with relation to which the move
ment of the machine as a whole isrcoordinated
so that it will feed itself along the face as fast as
the saws will permit, the saws being so designed
that they will break away by a wedging action the
slab ofthe mineral as it is cut from the face, and
being preferably stepped to produce an undercut
face so that their kerfs will be left open below to
permit the immediate discharge of dust as it is
produced and to allow the'conveyor to work under
the different levels so that the mineral as it is
broken oiî will fall freely and directly onto such
c:'I Cil
view with part of the props broken away for
clarity; the complete conveyor system being
shown in plan and the mineral face being shown
in cross section.
Fig. 2 is a diagrammatic view in elevation, Ã
showing anchorage for the chain by means of
which the slicing machine propels itself back and
forth along the face to be mined.
Fig. 3 is a View in front elevation of the min
ing machine.
Fig. 4 is a vertical sectional view of the ma
chine taken on the line IV-IV of Fig. ’7.
Fig. 5 is a transverse cross sectional view taken
on the line V-V of Fig. 4.
Fig. 6 is an end elevation of the mining ma- y
1.5
chine shown with the saws arranged for pro
ducing an undercut stepped face.
Fig. 7 is a horizontal cross sectional view taken
on the line VTI-_VII of Fig. 4.
Figs. 8 and 9 are detail cross sectional views 20
taken respectively on the lines vnr-_VIII of Fig.
4 and IX-IX of Fig. '7.
Fig. 10 is a sectional view taken in a vertical
plane through a saw kerf and showing the man
ner in which the slab as it is sliced orf is broken k25
away from the face by the saw.
Fig. 11 is a detail cross sectional view enlarged
taken on the line ìQ-ÉU of Fig. 6 with its shaft
and its housing shown broken away between its
30
front and rear frame bearings.
Fig. l2 is a view illustrating the wedging action
conveyor.
of the saw teeth.
My invention covers novel features in relation
to the mounting and drive of the back cutting
In Fig. l I show conventionally a coal mine in
which It represents the face of the coal to be
mined and II is a typical haulage way having a
track I2 therein for mine cars I3 which are
adapted to assume position under an elevating
and loading conveyor I4 which is driven by a
motor I5 and disposed to receive the coal contin
uously, as it is mined, from the conveyor i6 which 40
saws; of means for producing their relative ad
justment; of means for connecting and discon
necting them with the power drive; and of means
for reversing the movement of the slicing ma
chine and controlling these several operations
from a conveniently placed operator’s platform.
My invention further comprises a novel meth
od for mounting and driving the bottom and top
cutters which remove any mineral left on the
floor or roof that would interfere with the ad
vance of the mining machinery as its work pro
gresses.
1
>My invention further contemplates mounting
the top and bottom cutter bearings in fixed rela
tion with the adjacent back cutting saws and
adapted to be jointly adjustable therewith, each
cutter being driven from its respective saw
shaft.
My invention further comprises the novel de
tails of construction and arrangements of parts
which, in their preferred embodiment only, are
illustrated in the accompanying drawings here
inafter described and claimed, reference being
had to the accompanying drawings, in which:
Fig. 1 shows` a plan view of my mining method
in use, the slicing machine being shown in plan
runs parallel with the iacel IUl and is also driven "
by the same motor I5. Both conveyors are pref
erably of the endless type, but any suitable con
veyor mechanism may be employed. Cribs i 'l are
provided along the haulage way to support the 45
roof which, however, is allowed to fall as gob I8
behind the roof supports which follow the work
ing face, as it is cut.
These roof supports are illustrated in Figs. 5
and 6 and comprise bases I9 which support hy 50
draulic cylinders 20 having plungers 2I which "
carry roof engaging elongated caps 22 that over
hang the mining machine and support the roof
close to the face being mined. These cylinders
2t are supplied with hydraulic pressure by any` 55
suitable means, such as a flexible hose, not
shown, which connects to the nipples 23. A track
may be formed for the mining machine by a.
series oi conveyor pans 25.
These pans carry Z-bars 24 along their front?60
2
2,105,505
and rear edges which serve as guides for the slic
sprocket 6|, through the instrumentality of the
ing machinery which will be later described. The
yoke 65 controlled by arms fast on a vertical shaft
66 (see Fig. 5) which in turn is adapted to be
rocked by a crank 6l controlled by an operating
pans are supported above the mine iioor 215 by a
series of shoes 2l' which are suitably connected
to the main pan sections 25 and to the under pan
28 which house between them the return iiight
of the endless conveyor i6. The ñights of this
conveyor travel along on a front extension apron
rod 68 (see Fig, 7). ’I‘he shaft 56 is journalled
in the upper and lower bearings T0 suitably
29 loosely connected to the forward edge of the
which it is adapted to shift the multiple sprocket
mounted within the frame and on its upper end it
carries a second clutch yoke 1|, by means of
10 under pans 28 and adapted to rest freely on the
'l2 on its shaft '13, causing a clutch element there
ñoor in position to support the working flight of
the conveyor I8 close to the face. The flights of
the conveyor are guided and held spaced by lon
gitudinal guide elements generally indicated by
15 the numeral 30. With this arrangement, only the
working flight of the conveyor is exposed and its
blades extend forwardly into juxtaposition to the
on to engage or disengage a complemental clutch
face lil being mined.
„
The mechanism for slicing the face, repre
senting the preferred embodiment' of my present
invention, comprises a portable frame 3l, sho-wn
in front elevation in Fig. 3, which comprises a
top shield 32 which overhangs the frame at one
end so as to protect a cable reel 33 journalled in
25 the bearings 34 on the end w'all of the frame 3l
30
35
element driven by a multiple sprocket 16, mount
ed in the rear housing extension above the sprock
et 6i and driven by a sprocket 11 on the shaft of
the motor 'IS (Fig. 4) which is mounted imme 15
diately above and in line with the motor 64 and
which also receives its power direct from the cable
35 under control of the switch 3l. Both of these
motors are turning in the same direction and at
the same speed, and both multiple sprockets 6I 20
and ‘i6 are likewise driven at the same speed and
in the same direction. The shaft 13 is journalled
' in bearings i4 and l5 in the frame.
The clutch drum elements 44 and 45 are con-
stantly driven in reverse directions through the 25
and having coiled about it a conductor cable 35
which supplies the current through the leads 35
(Fig. 7) under control of a switch 31 to the motor
drive mechanism described, and according to the
drive for the machine.
give it a forward or reverse drive.
_
position of the drum 46 they will either leave the
tubular drive shaft 80 (Fig. 5) idle or they will
The forward
drive, transmitted through the drum 45, is a slow 30
The front face of the machine toward the wall
being minedpis closed by a plate 38 having a
speed drive and its motion is imparted to the
housing 39 (Fig. 5) attached thereto and pro
sprocket 4i which by engagement with the chain
jecting forwardly of the machine to receive the
d2 .advances the machine parallel with the face
sprockets 40 and 4l (Fig. 3) about which the
i@ being mined. When the drum element 44 is
chain 42 is passed, one end of the chain toward
interlocked with the drum 4S the drive to the 35
sprocket fil'is reversed and is a high speed drive
the haulage way being suitably anchored to the
pan 25 and its other end being made fast as by
means of the jack 43, shown more clearly in
preferably about three times the forward drivingr
Fig. 2.
to starting position rapidly to save time.
'I‘he position of the movable drum 46 is con 40
trolled by the shaft 8l which telescopes in the
tubular shaft 8f! and by means of the key 32 (see
Fig. 5), working through a longitudinal slot in
the tubular shaft Sil, it engages the hub of drum
45, and acts to shift said drum either to neutral, 45
The housing 39 has openings at its ends for the
chain 42 to approach and leave these sprockets
40, 4 I, the sprocket 49 being suitably journalled on
a` stud bearing in the frame and operating as an
idler, while the sprocket 4l is fast on a shaft jour
45 nalled in the frame and driven through a suit
able reversib-le clutch such as that shown in Figs.
5 and 7. The clutch, as illustrated, comprises the
outer drum elements 44 and 45 with an interposed
axially shiftable inner drum 46, there being sets
50 of plates 4l interposed between the drum 45 on
the one hand and each of the drums 44 and d5 on
the other hand. These latter drums each carry
a sprocket 48, which sprockets are reversely
driven by chains 49 and 59, (Fig. 4) which re
55 spectively engage the sprockets 5l and 52. The
sprocket 5l is fast on the low speed countershaft
53 which is driven by the gear 54 that meshes the
pinion 55 (see Fig. 3) fast on a drive shaft 56
connected at its inner end to a shaft 517 (see
Fig. 5) which turns in a bearing 53 mounted in
an intermediate partition 59a in the frame.
The shaft 57 has free» thereon a multiple
VVsprocket 59 adapted to be driven‘` through a
toothed clutch @il by means of a multiple sprocket
6l housed in a back housing extension on the
casing 38 and having suitable bearings in the back
wall 62 of the frame. This sprocket 5l is driven
by suitable chains from the sprocket 53 on the
drive'shaft of the motor 64, suitably mounted
70 within the frame.
In Fig. 7 it will be seen that the sprocket 5S,
free on the shaft 5l, carries integral therewith
one of the elements of the clutch 6l] which is
adapted to be moved into and out of engagement
75 with the other clutch element, driven by the
speed.
Thus the mining machine can be backed
or forward, or reverse driving positions as above
described. The shaft 8l is controlled by a yoke
83 (Fig. 5) which swings on a rocker shaft 84
mounted on bearings 85 (Fig. 6) carried by the
middle partition 59a. This shaft 84 extends for 50
wardly through the machine, as seen more clearly
in Fig. '7, and is controlled by a lever 8B con
veniently accessible from the operator’s plat
form 8l'.
The lever is shown in neutral position in Fig. 55
7 and the dotted lines (Fig. 6) show its positions
for the forward or reverse drive.
The operator
from the platform El can also reach the rod 68,
which controls the clutch operating shaft 65 and
serves to engage or disengage the machinery with 60
the motors` 64 and '18. It will of course be under
stood that a single motor may be substituted for
the two motors 54 and i8, but I prefer to use the
two smaller motors as it gives me a more com
pact construction and simplifies the drive.
65
I have illustrated my invention in Fig. 3 as
comprising three saws 9@ which work in vertical
alignment in a common plane, whereas in Fig. 6
I show the same saws set back in stepped rela
tion with the upper saw pitched upwardly to out 70
its slice at an obtuse angle -to the roof. The
saws are shown in vertical alignment in both
views, but they may be transversely stepped one
ahead of the other, preferably with the lower saw
ahead and the saws above it dropping back in 75
3
2,105,505
order `from bottom to` top, and when I referto
“stepped” I mean the term toincludethe stepped
relation of the 4saws. in a plane 4normal to the
face> as well as in a plane parallel with the face,
either or both.
The saws have tubular hubs 9| fast on the
forward ends of their respective. drive shafts 92,
which shafts turn in. tubular housings 93. The
housingV 93 for the lower saw shaft, as seen` more
10 clearly in Fig. 1l, has fast thereon at each end
the collars. 94 and 94d.,v each having a flange that
slides in its respective vertical ychannel 9,5, 95a
as a guide and each 4flange has a pair of verti
'cally elongated slots_96 which receive the cross
15 pins 91 which permitîvertical adjustment of the
lower saw assembly. The housing for the middle
saw shaft carries flanged. collars 94, 94a, which,
however, are rigidly connected to the kchannels 95,
95a by bolts. and are therefore not adjustable.
20 The upper saw housing is adjustably mounted in
the channels 95, 95a like the lower saw housing.
For the lower and middle saw housing, I pro
vide a yoke |00 integral withcollar 94a at one
end and at the other end bored to receive its
-25 respective housing 93 and rigidly secured there
to. Within each yoke >|001 mount a multiple
sprocket |0| _on its respective saw shaft 92. The
lower sprocket |0| is driven by the chain |02
from the sprocket 59 (Fig. 4) on the shaft 51. I
30 mount. a ball bearing |03 »in each collar 94a and
each bearing housinglßß and |31, (Fig. 6).
When the upper saw shaft housing is parallel
with the lower saw shaft, it is mounted in the
channels y9.5, 95a exactly. like the lower shaft
housing above described. But when the housing
for the upper saw 92 is inclined upwardly, as
shown in Figs. 6 and 8, it is mounted in an elon
gated yoke |04, the outer leg of which is similar
to that described for the other yokes- andA is sim
40 ilarly adjustable in the rear channel 95a but the
forward leg |05 of the yoke |04 extends entirely
across the machine and‘is there attached directly
to a plate. 94h (Fig. 8) `which has a vertical ad
justment by the pins 9_1 and slots 90 in the for
ward channel 95.
For effecting vertical adjustment of the lower
saw shaft I provide, as seenin Fig. 6, bell cranks
|06 mounted'in bearings |01, |01a, bearing |01
being mounted on the front frame element 36 so
as to overhang forwardly therefrom so that a
bell crank |00 can be pivotally connected over
head to a bearing housing |08 fast on the lower
shaft housing 93, while the rear bell crank |06
is mounted in its bearing .|.01a attached to the
bottom of the frame with its rear end overhung
to be engaged to the forward end of the yoke
|00. These two bell cranks are connected by
right and left hand threaded rods |09 (Fig. 6),
which rods screw into the right and left hand
threaded hub of a hand wheel H0.
the machine and carries a pinion ||5 which
meshes a rack ||1 fast on an extension of the
rear arm of the yoke |04 which overlaps the rear
side of the rear channel 95a. The shaft ||4
carries a forward pinion H8 which works oppo
site a slot in the housing | I5 through which a
rack |20, fast on the forward yoke arm |05,
passes. By this arrangement, the turning of the
hand wheel | I i, will raise and lower the yoke _|04
without changing the alignment of its upper saw
shaft.
In the yoke |04 I mount a multiple sprocket
|2 l, which turns loose on a stub shaft |22 and at
its forward end the sprocket has formed thereon
a bevelled gear |23.' Forward of the gear |23
the stub shaft carries an angled bearing |24 for
the upper saw shaft 92. 'I'his upper saw shaft
is fast to a bevelled gear |25 meshing the gear
|23. The multiple sprocket |0| for the interme
diate shaft and i 2| for the upper shaft are driven ,
by means ofa common chain |25, (Fig. 4) which
chain passes under an idler sprocket |21 and
about the sprocket 12 driven by the motor 18.
By the mechanism described, the upper and
lower saw shafts are capable of adjustment in
parallelism, the slack in their driving chains be
ing taken up by the idler sprockets |21 and |28.
The saw ñange 90, which tapers from .the
hub toward its marginal edge, is formed with
radial bit sockets I 3|.
These sockets open at 3,0
their inner ends into a countersunk recess |32 in
the face of the saw in the center of the flange,
and radial saw teeth |33 are suitably anchored
in the bit sockets |3|. The saws are set to cut
only in one direction of rotation.
The bearing housing |08, fast on the forward
end of the lower shaft housing 93, has a depend
ent arm which forms a vertical bearing for the
drive shaft for the bottom cutting saw |34 (Fig.
6) fast on a shaft which carries at its upper end ..
a bevelled gear |35 which meshes a bevelled gear
|36 fast on the shaft 92. Thus, this lower shaft
serves to drive the lower saw 90 and the bottom
cutter |34. In like manner I mount fast on the
housing 93 for the upper saw shaft a housing |31
(Fig. 6) similar to the housing |03 and carrying
in its upper end the top cutting saw |38 having
a drive shaft, turning in a bearing |39 formed
as an extension of the housing |31 and driven by
a bevelled gear |40 meshing a driving pinion I4!
fast on the upper shaft 92. In this manner the
upper saw and the top cutter have a common
drive.
By reason of the manner of mounting the top
and bottom cutters, they always work in fixed
relation to the upper and lower saws and for
this reason are mounted so as to be adjustable
with said saws.
It is important to note the manner in which
the advancing saws act to break off ahead of
By turning this hand wheel the bell cranks can
be correspondinglyrocked .to raise or lower the
lower shaft housing 9_3 Without disturbing its
horizontal alignment. 'I‘his identical housing ad
justment means may be applied to the upper
shaft when it works horizontal, but in the case
of the inclined upper shaft, as shown in Figs.
6 and 8, a hand wheel ||| is provided, which
turns a shaft. carrying a worm, not shown,
them the mineral which they slice off from the
face l0. The teeth |33 are set at an angle to the
plane of progress of the saw and each stands free
beyond the saw ñanges. The kerf cut by the tip
which meshes the worm gear ||2 that turns in a
becomes greater there is a yielding of the min- F
eral and also a giving of the toot-h which tends
to produce a chatter or vibration of a tooth so
housing ||3 and is fast upon a shaft ||4 turning
in a housing ||5 -connected at an intermediate
of the teeth is a relatively narrow kerf and as' ‘
each tooth advances the pitch of its outer face
causes that face of the tooth to rake with an
outward pressure against the outer face of the
kerf cut by the tips of the teeth. As the pressure
point to housing | |3 andat its ends to the front . that as the saw advances it will act most ef
fectively to break off the mineral in pieces, such
the shaft> | |4 overhangs beyond therear wall of as |42 illustrated in Figs. 'l and 12. Moreover,
and rear walls of the machine. The rear end of
4
2,105,505
this outward pressure is exerted radially with
ports I9, 20, 2l, 22 are also'advanced from time
respectl to the axis of the saw and as it breaks
vto time so as to follow up the receding -face and'`
to permit the roof to subside behind them. The
Vdown the mineral pieces M2, it will cause them
to part with radial fractural lines as indicated
Ul typically in Fig. l0. it is preferable to obtain
this wedging and breaking of the mineral by the
`action of the teeth rather than the bevelled saw
ñange, as the latter will produce a constant fric
tional rdrag Without that vibration which the
10 individual tooth will give and which facilitates
the fracture. The taper of the saw flange, how
ever, will engage any portions of the severed slice
which contact it and will insure that the mineral
15
saw cutting operation is again repeated and the
face is sliced oif and conveyed away as fast as it
falls. The mineral comes down in desirable
sized lumps without any more dust than is pro
duced by the relatively thin saws. '
The saws will be designed and arranged ac
cording to the conditions to be dealt with in the
face being worked, their number, size, the'pitch
of their outer wedging farces, the spacing of the
top and bottom cutters, and the adjustment of
slice is broken away in advance of the saw shaft.
In operation, assuming the saws arranged as
the saw shafts being all such as are best suited
disposed in Fig. 6 with the roof supports in place
any, therein, the character of the mine roof and
floor, and such other considerations as enter into
and raised by hydraulic pressure so as to support
to the character of the mineral, the partings, if fl 5
the _roof above the machine and its track, the
motor I5 is started up to put the conveyor into
service and the operator, having thrown the lever
68 to engage the clutch elements 59 and t@ and
the successful operation of this improved method
of mining which, as such, forms the subject mat
ter of my co-pending application, Serial No. 20
having closed switch 3l' so as to pass current from
It is important to note that the conveyor ex
tends the full length of the face being worked
and is interposed between the mining machine
conductor 35 to the motors 66 and lil, takes _his
position on the platform 3l and the machine is
25 ready for operation, with the clutch element ¿S
still and the drums @lli and ¿i5 reversely rotated
by the motor Sli. The operator then grasps the
handle 86 and throws the clutch element ¿i6 so
as to engage drum element Q5 and thereby to
The drive of shaft Si) rotates
30 drive the shaft 8i).
39,707.
track and the face with its working flight travel
ing along the floor in position to engage the coal
as it falls, due to the breaking away of the sliced
face, without handling. The periodic advance
of the mining machine track carries forward at
the same time the hinged apron upon which the 30
the sprocket ti that is fast thereon and which, working flight of the conveyor travels. In the
_beingvin mesh with the chain ¿2, will start the drawings we show a baiTle |56 in Fig. 6, which
machine in forward motion along its track, will tend to deflect the coal from the upper bench
bringing its saws _into engagement with the face -so that it will fall directly onto the conveyor
35 I to be cut.v
The saws are being constantly driven by the
apron. By adapting the machinery to cut the 35
slices thin enough so that as they are broken
motors ‘it and till, motor ‘i3 acting through chain
away in front of the saws, the machine will bring
|26 to drive the two upper saws, while motor 64
through chain m2 drives the lower saw. The saws
40 having been correctly set with relation to the
roof and floor so that the top and bottom cutters
down the face, otherwise unbroken, throughout
work as close as practicable to- roof and floor
respectively, the operation of slicing off the face
45
of the seam of coal, or other mineral, thereupon
proceeds. Each saw as it advances cuts a thin
slice or surface section of the face and breaks
` the slice away ahead of its shaft as indicated in
Fig. 7. The saws cut the face into inwardly over
hung benches or steps, as seen in Fig. S, which
being unsupported underneath will fall clear, as
/ the cutting and breaking away proceeds, so the
saws will not bind.
The sliced mineral, as it is
broken away by the wedging action of the ad
vancing saw teeth, drops onto the apron’fâ -and
55 is carried forward by the exposed conveyor
its full vertical extent as it progresses along the
face and no horizontal intermediate cutting or 40
other preparation of the face is required, it being
noted that applicant’s cutters i311 and H38 work
on the» roof and the floor behind the face and
do not out the face in front of the slicing saws.
Thus these saws constitute the complete means 45
for bringing down the face without requiring
other treatment thereof.
While I have shown my invention in but two
forms, it will be obvious to those skilled in the
art that it is not so limited, but is susceptible of 50
various other changes and modifications, with~
out departing from the spirit thereof, and I de
sire, therefore, that only such limitations shall
be placed thereupon as are imposed by the prior
art or as are specifically set forth in the ap~
' flights l5. The conveyor is in position to gather
pended claims.
' up the mineral as it is cut and deliver it without
What I claim is:-l. In a mining machine, a carriage movable
back and forth along the face to be mined, a
handling to the elevating conveyor lé! which "de
posits in a mine car i3.
'
'
When the machine reaches the end of its cut
ting travel, which normally will be at the inner
end of the face it, the operator -throws lever 86
track for the carriage extending along and 60
movable to follow the receding face being mined,
a plurality of back-cutting saws mounted in said
to cause clutch element ¿l5 to engage and be re
carriage to rotate at different levels in planes
` versely driven by the drum element M which - parallel ‘with the face opposite them and close
65 rotates at a higher speed than element d5, being
driven directly from the motor counter-shaft 56
(Fig. 3) while element £5 is driven with a speed
reduction from shaft 53. This runs the machine
back at a rapid speed, to cut down idle time, into
70 position with its saws standing clear of the face
i8 in the haulage way ii. Thereupon, the con
veyor supports andv the lmachine run-way >is
pushed forward by any suitable mechanism until
it again assumes the proper spacing with rela
thereto to sever therefrom readily breakable 65
slices, a drive means for said saws, and cutting
teeth on the saws which present to the mineral
slice cut free from the face an inclined edge dis
posed to exert a'wedging action in a direction
to break off the sliced mineral as the saws ad 70
vance along the face.
2. In a mining machine, a >carriage movable
back and forth along the face to be mined, a
track for the carriage extending along and mov
tion to the new face i6. The hydraulic roof sup- . able to follow the receding face being mined, a 75
2,105,505
saw mounted in said carriage to rotate in a plane
parallel with and juxtaposed to the face, a drive
means for said saw, and cutting teeth on said
saw which present to the mineral slice cut free
from the face an inclined edge disposed to exert
a Wedging vibratory working force outwardly
from the face in a direction to break off the sliced
mineral as the saw advances along the face.
3. In a mining machine, a carriage movable
10 along the face to be mined, a track for the car
riage movable to follow the receding face being
mined, a plurality of saws mounted in said »car
riage to rotate in planes parallel with the face
opposite them and adapted to break away the
15 sliced mineral ahead of them, a drive means for
said saws, and -means to adjust the saws rela
tively to vary their respective cutting levels, the
saws being juxtaposed to break away the entire
face lying between the uppermost and lower
20 most saw kerf.
4. In a mining machine, a carriage movable
along the face to be mined, a track for the car
riage movable to follow the receding face being
mined, a plurality of saws mounted in said car
25 riage in stepped relation and disposed to rotate
in planes parallel with the face opposite them,
and a drive means for said saws.
5. In a mining machine, a carriage movable
along the face to be mined, a track for the car
riage movable to follow the receding face being
mined, a plurality of saws mounted in said car
riage to rotate in planes parallel with theface
5
a conveyor means working between the mining
machine and the base of the face, and a bottom
cutter mounted and driven to rotate in a hori
zontal plane and cut a level ñoor for the advance
of said conveyor means as it is moved to follow
the receding face.
11. In a mining machine, a carriage movable
along the face to be mined, a track for the car
riage movable to follow the receding face being
mined, a plurality of saws mounted in said car
10
riage to rotate in planes parallel with the face
opposite them and staggered to produce an un
dercut stepped face, a drive means for said saws,
and an endless conveyor means having its work
ing flight traveling parallel with and overhung 15
by said undercut face.
12. In combination, a machine carrying a
staggered bank of saws disposed to produce an
undercut stepped mineral face, means to guide
the machine along said face to cut it away in 20
thin slices, means to break down the sliced
mineral responsive to the advance of said ma
chine along the face, and a conveyor means
traveling along and parallel with the base ofthe
face in position to receive the sliced off mineral 25
as it is broken down and remove it.
13. In combination, a machine carrying a
staggered bank of saws disposed to produce an
undercut stepped mineral face, means to guide
the machine along said face to cut it away in thin 30
slices, means to break down the sliced mineral
responsive to the advance of said machine along
the face, a conveyor means working along the
face in position to receive the mineral as it falls
opposite them and set so that each progressively
undercuts the mineral being sliced oif by the saw
next above it, a drive means for said saws, andl and remove it, and roof props adapted to over 35
means to break down the mineral slice cut by hang the path of said machine and support the
each saw.
6. In a mining machine, a carriage movable
along the face to be mined, a track for the car
40 riage movable to follow the receding face being
mined, a plurality of saws mounted in said car
riage to rotate in planes parallel with the face
opposite them, and means to cause each saw to
break down the mineral slice which it cuts.
7. In a mining machine, a carriage movable
along the face to be mined, a track for the car
riage movable to follow the receding face being
mined, a plurality of saws mounted in said car
riage to rotate in planes parallel with the face
50 opposite them and staggered to produce an un
dercut stepped face, a drive means for said
saws, and means to break down the mineral slice
which each saw cuts.
8. In a mining machine, a carriage movable
55 along the face to be mined, a track for the car
roof in juxtaposition to the overhanging top
bench of the stepped mineral face.
14. In a mining machine movable along a
mineral face, a back cutting saw disposed to cut 40
a kerf parallel with the face and juxtaposed
thereto, and means to rotate said saw, said saw
having teeth which project beyond its periphery
and are designed with working faces disposed
both to cut the saw kerf and to exert an increas
45
ing outward component of force adapted to break
away the slice as it is cut from the face by the
advancing saw.
15. A mining machine according to claim 14,
-in which the teeth present a slice engaging edge 50
which is inclined in a direction outwardly and
toward the saw axis.
16. In a mining apparatus, a machine, a track
therefor extending along parallel with the face
riage movable to follow the receding face being
to be mined, means to propel the machine back 55
and forth along said face, means to slice oil’ and
mined, a plurality of saws mounted in said car
break away the face as the machine progresses,
riage to rotate in planes parallel with the face
an endless conveyor having its idle flight travel~
ing in the same plane with its working flight, the
latter flight being movable along the floor level 60
at the base of the face being sliced through out
opposite them and arranged in a vertical bank set
60 progressively in advance of one another from
top to bottom to under cut the face, and a drive
means for said saws.
the length thereof, and an apron over which said
9. In a mining machine, a carriage movable
along the face to be mined, a track for the car
Working flight slides and which is interposed
opposite them and in relative position to slice
follow the receding face.
18. A mining apparatus according to claim 16,
in which the track comprises a covered housing
in which the return iiight of the conveyor travels
below the machine level.
ERSKINE RAMSAY.
between the track and the face.
17. A mining apparatus according to claim 16, 65
65 riage movable to follow the receding face being
in which the apron is hingedly attached to and
mined, a plurality of saws mounted in said car
riage to rotate in planes parallel with the face ` adapted to be advanced along with the track to
off the face _to be mined, means to break away the
70 face as it is sliced by said saws, a top cutting saw
mounted to cut a horizontal kerf .adjacent the
roof, and a drive means for said saws.
10. In a mining machine according to claim 9,
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