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Патент USA US2407449

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'
Sept. '10, 1946.
E. RAMS‘AY
'
MINING MACHINE/1
Filed July 3, 1944
2,407,448
'7 Sheets-Sheet 1
ERSKINE ‘RAMSAY
INVENTOR
‘ATIEJR'NEY,
I
>
Sept. 10, 1946'.
E. RAMSAY
2,407,448
MiNING MAGHINEY
Filed July 3', .1944
7 Sheets-Sheet 2
EREKINE RAM-SAY’
INVENTOR
BY M /
ATTOR EY
“474
_ Sept. 10, 1946.
' E‘. RAMSAY
2,407,443
MINING MACHINE
Filed‘ July 3, 17944
7 Sheets-Sheet- 5
E R SKIN BEAM SAY
INVENTOR
~
‘
‘
. '
wmw
‘Sept, 10, 91946. ’
E. RIAMSAY‘ .
-
2,407,443 1
‘MINING MACHINE
Filed July 5, 1944
'7 ‘Sheets-Sheet 4 I
n num
'ER'SIKINE RAMs/w
INVENTOR
ATTORNEY I
Sept. ‘10, 1946‘.
2,407,448
E. RAMSAY '
MINING MACHINE
' Filed Jui'y s, 1944
\
2.\.
6.mm.
zlni
EREKINERAM SAY
-
:INV'ENTOR
.
'
ATTORNEY
.
‘
'
Sept. 10, 1946."
I
‘
-E.‘RAMSAY
MINING
2,407,448
MACHINE
I
Filed July 3, 1944
v'7 sli‘qeis-sneet' s '
I ERsKmER-AMSAY
.
INVENTOR
~ BY ' ATrbRNEY
-
Sept. 10, 1946.
'
w
'
E. RAMSAY
MINING
MACHINE
_
2,407,448
'
Filed July 3, 1944
7 Sheets-Sheet 7
EREKIN E ,R AM SAY
~
INYVENTOIyI
'. ATTORNEY -.
“
I
2,407,448
Patented Sept. 10, 1946
UNITED STATES IiPATENT OFFICE
2,407,448
MINING ll/IACHINE
Erskine Ramsay, Birmingham, Ala.
Application July 3, 1944, Serial No. 543,304
6 Claims. (01. zsz-ezs)
1
This invention relates to machines for mining
coal, and has for its principal object the pro
Vision. of self propelled apparatus of the char
acter designated which shall be adapted for driv
ing headings and air courses in mines while mov-'
ing forwardly and which shall be'reversible and
adapted for cutting out the pillars alongside said
headings and air courses on reverse movement.
deliver coal continuously from the beginning to
the end of a shift.
‘Apparatus embodying features of my invention
is illustrated in the accompanying drawings,
forming a part of this application, in which
Fig. 1 is a plan view of a preferred embodiment
of my improved mining machine;
Fig. 2 is a sectional elevationof the same;
Fig. 3 is ‘a sectional view taken along the line
A further object'of my invention is to provide
‘
a mining machine which shall embody a pair of 10 III-III of Fig. 1;
Fig. 4 is a detail sectional view showing the
gangs of cutter bars pivotally mounted on the
means for raising the rear of the frame with
front of the machine to project forwardly there
respect to the supporting wheels;
from, together with means to swing and spread
Fig. 5 is a detail sectional view of the guide‘
said gangs of bars apart and hold them to their
spread-apart working positions, whereby a head 15' means of Fig. 4, taken substantially along the
ing may be driven by forward movement of the . lines V—V of Fig. 4;
Fig. 6 ‘is a detail sectional view showing the
machine with the gangs of bars held close to
single front supporting wheel and its means of
gether and upon reverse movement the gangs of
adjustment;
cutters may be spread apart and operated to
Fig. 7 is a detail sectional view taken along the
20
widenthe heading and remove pillars.
line VII—VII of Fig. 6;
A still further object of my invention is to pro
Fig. 8 is a detail sectional view of one of the
vide a self propelled reversible mining machine
sectional shafts upon which the gangs of cutters
adapted to make a cut moving forwardly or rear
are mounted and indicating associated parts in
wardly and which shall include a conveyor for
dash lines for the sake of clarity;
.
removing material broken down by the machine.
Fig. 9 is a detail sectional View showing the
A further object of my invention is to provide
a mining machine which shall embody a pair of
games of cutter bars pivotally mounted on ver
tically disposed parallel shafts at the front of
the machine to project forwardly therefrom, the
construction of the shafts being such that the
cutters in each gang may be separated or brought
closer together and the shafts lengthened or
shortened, thus to accommodate the machine to
seams of various thicknesses.
As is well known in the art to which my in
vention relates. the mining of coal manually con
sists of the following laborious operations: (a)
?rst the seam is undercut with pick and shovel
or undercutting, mechanism so that it may be
broken down; (1)) holes are then drilled for blast
ing and are loaded with explosive; (c) the ex?
plosive is ?red, breakingr down the coal; (at) the
drive for the cutter chains;
'
Fig. 10 is a detail sectional .view showing one of
the jacks employed for adjusting the spacing be
tween the cutter chain housings;
‘
I.
.
Fig. 11 is a detail plan view showing the mech
anism for swinging the gangs of cutters inwardly
and outwardly;
‘
Fig. 12 is a longitudinal sectional view taken
along the line XII——-XII of Fig. 11;
Fig. 13 is a sectional view taken along the line
XIII—XIII of Fig. 12;
.
Fig. 14 is a detail sectional view taken along
the line XIV-XIV of Fig. 11;
Fig. 15 is a plan view showing a modi?ed form
of my invention;
'
Fig. 16 is a detail sectional view taken along the
line XVI-—XVI of Fig. 15 and showing the mount
ing for the cutter chains;
coal is then loaded in cars by hand or loading 45
Fig. 17 is a sectional elevation of the machine
machine and hauled out of the mine; (6) the
shown in Fig. 15;
working plane must then be cleaned up and the
Fig. 18 is a detail plan view showing the means
roof timbered so that the operations just de
for loading the coal on to the conveyor as it is
scribed may be repeated. It will be observed that
broken down;
‘
by this system of mining, the only time coal is
Fig. 19 is a detail view showing the mechanism
delivered from the mine is during the period (d)
for operating the jack screws between the cutter
when it is being loaded in the cars.
housings;
'
'
Fig. 20 is a detail view of one ofthe guide posts
It is accordingly a prime object of my inven
upon which the cutter driving sprocket housings
tion to provide a machine which will mine coal'
with no manual digger or loading and which will 55 are mounted; and
.
I.
2,407,448
3
4
Fig. 21 is a detail view of a worm shaft mount
ing for one of the jack screws.
Referring now to the drawings, the main
frame of my machine consists of longitudinally
extending channel members 5 and 6 to which
is welded a main frame plate ‘l which extends
from the rear to the front of the machine.
At
8 and 9 are shown driving wheels, each of which
porting housing 63. Mounted in the housing 63
between the sprockets 53 and 55 is a sprocket 55
which is driven by a chain 65.
The upper housing 63, on the inner side there
of, is provided with an integral bracket 55 which
is secured to a guide post 6%. See Fig, 20. The
next lower housings are provided with similar
brackets which are slidably mounted on said
is mounted on a stub axle 80, the axle being car
guide post. The guide post 60 is hollow and has
ried by a mounting bracket l I which is vertically 10 its lower end slidably mounted in a sleeve 15
slidable in guides l2 secured to the underside of
which is ?xedly supported in the frame plate
the main frame plate 1, which driving wheels
1-’. Beneath the frame plate ‘I is a similar guide
form the principal support for the machine. See
post 1!!’ which is secured to the lowest bracket
Figs. 3, 4 and 5. Mounted on the frame plate 1
65 on the lowest housing 83, and on which the
is a short section of a channel I3, and secured 15 intermediate brackets are slidably mounted. The
to the channel l3 and to the channel 5‘ alongside
guide post 60 telescopes in the hollow post 18.
thereof is a bracket M in which is rotatably
The structure described permits vertical move
mounted an adjusting nut l6, through which
ment of the housing 63 but, in association with
is threaded an adjusting screw I ‘l. The screw
the main driving shaft, about to be described,
I1 engages the top of the wheel housing H and
holds said housing against angular movement.
the nut It may be rotated by means of the hand
It will be noted from a consideration of Fig.
wheel 18, whereby the height of the frame, with
1 that the cutting mechanism just described is
respect to the driving wheels 8 and 9, may be
mounted in two gangs indicated generally by the
varied.
numerals 6'! and 63, which extend forwardly
The forward portion of the machine is sup 25 from the machine, and which may be brought
ported by a single wheel i9 which is mounted
close together to the full line positions shown
in a wheel housing 2i which in turn is mounted
in Fig. 1 or spread apart to the dotted line posi
in guides 22 and 23 secured under the underside
tions by mechanism to be described later. The
of the main frame plate ‘I. Mounted above the
gang of cutters 6'! is supported and driven from
main frame plate ‘l is an adjusting bracket 25
a main supporting and driving shaft 69, while
in which is rotatably mounted an adjusting nut
the gang of cutters 68 is supported and driven
26, through which extends a supporting, ad
from a main supporting and driving shaft ll.
justing screw 21, operated by a hand wheel 23.
Details of the construction and mounting of the
By the means shown the front of the machine
shafts 89 and ‘H is shown in Fig. 8. Mounted
may be raised or lowered relative to the rear of 35 on the shafts 69 and ‘H in each of the housings
the machine, and the inclination of the machine
63 is a driving sprocket 12 which drives the
with respect to the‘ horizontal thus varied.
sprocket 84 through the chain 66. See Fig. 9.
My improved machine is propelled forwardly
Each of the driving and supporting shafts
or rearwardly, as required, by means of a revers
comprises a plurality of internally toothed sleeves
ing motor 29, which is mounted centrally at the 7
rear of the machine in an opening 30, formed in
the main frame plate ‘I.
The rear of the frame is reinforced for this
purpose by means of cross channels 3| and 32,
from which the motor 29 is suspended, and a
cross plate 33 mounted on top of the channels 3!
and 32. The motor 29 drives through shafts 34
and 35 protruding'from its ends, the shafts 34
and 36 carrying elements of clutches 3'! and 38
which may be connected selectively to worm
shafts 39 and 4|, having mounted thereon, re
spectively, worms 42 and 43. The worms 42 and
43 mesh with worm gears 44 and 46, mounted
respectively in housings 4'.’ and 48, on opposite
‘l3, ‘l4 and ‘It, into which fit externally-toothed
shaft sections l8, 19, SI and 82. Each of the
sections thus described has ?xedly mounted
thereon one of the housings 83. The central
sleeve section 14 is mounted in a suitable hear
ing 63 in the frame plate 7 and is held against
vertical movement therein. The upper end of
each of the shafts 6‘9 and ‘H is braced by means
of a member 84 in which the shaft may rotate
and move vertically and which extends down
wardly and rearwardly to join the main frame
at 86. The lower end of each of the shafts is
braced by a member 81 in which the shaft may
rotate and move vertically and which extends
The worm gears 44 and
rearwardly and upwardly to join the main frame
at 88. In order to provide additional support
46 are connected, respectively, to forwardly ex
tending drive shafts 49 and SI, each of which
and stiffness to the main frame I secure cross
carries on its forward end a worm 52 which
meshes with a worm gear 53. The worm gears
and ‘81 are joined, as may be seen in Fig. 2. It
will also be seen from the construction just de
sides of the machine.
channels 89 and 9! thereto where the braces 84
53 are connected to the drive wheels 8 and 9. ‘See (ii) scribed, that the sectional shafts l'i9 and ‘H may
Fig. 4. By the means shown, the drive wheels
be lengthened or shortened by relative move~
8 and 9 may be driven in unison or may be driven
ment between the outwardly toothed sections and
separately to change the direction of the machine.
the sleeve members.
The cutting mechanism employed with my im
The cutter chain housings 5i arespaced apart
proved machine comprises cutter chains 54 hav (iii and supported with respect to each other by
ing mounted thereon cutters 58. See Fig. '16.
means of jack screws 92, 93 and 95, the latter two
This mechanism is so well known in the art to
being interposed between adjacent housings 63.
which my invention relates it requires no detailed
As shown in Fig. 2, there are three sets of these
description. The cutter chains are mounted in
jack screws above, and three below the frame
pairs in housings 5'! having driving sprockets 58
and 59 at the rear and smooth pulleys 6i at
the front around which the cutter chains run.
See Fig. 9.
The sprockets 58 and 59 for each
housing 5‘! are mounted on a short shaft 62
which in turn is journalled in the walls of a sup.
plate 1. A detail of one of these jack screws is
shown in Fig. 10. These jack screws are oper
ated in unison by mechanism about to be de
scribed and function to adjust the gangs of cut
ters to the width of the seam being mined. With
a thick scam, the cutter housings are separated
2,407,448
5
6
further, while with a narrow seam they are
drive of each set of jack screws 92, 93 and 95 is .
brought closer together. In event a very narrow
seam of coal is encountered, the upper section
18 and the lower section 82 of the shaft, either
or both, may be removed. This may be accom
ever, that as the housings 51 and 63 are raised
similar to that just described and its description
will not be repeated. It will be understood, how
or lowered, compensation for the varying dis
tances between the motors I68 and I I6 and their
plished by screwing the associated jack screws
92, 93 and 95 entirely out of their adjacent hous
associated driven sprockets must be made. rI‘his
may be accomplished by shortening or lengthen
ings. It will be seen from the foregoing descrip
ing the chains H3, H6 and H8 or by any other
tion that the vertical support for the gangs of
cutters 61 and 68 is derived from the shaft sec 10 suitable means known to the art.
The mechanism for varying the positions of
tion 14, the bearing 83, and the frame plate 1.
The cutter housings 51 and 63, below the frame
plate 1, therefore, are suspended by the jack
screws 92, 93 and 95, while those above the frame
plate 1 bear downwardly on their associated jack 15
screws.
The gangs of cutters hereinbefore described
are driven by means of four motors 91, 98, 99
and I60. These motors are mounted, two above
the main frame plate 1, and two below, as may
be seen in Fig. 3. Each of the motors 91 and 93
has mounted on its shaft a pinion IDI which
meshes with a gear I93, mounted on the driving
g
the gangs of cutters 61 and 68 relative to each
other will now be described. Referring particu
larly to Figs. 1 and 11 to 13, the gang of cutters
61, above the frame plate 1, has connected thereto
an operating link I52 and beneath the frame plate
1 has connected thereto an operating link I53.
The links I52 and I53 are connected to rearwardly
extending links I54 and I51 by means of a pin
20 I56. The links I 54 and I51 are connected at their
rear ends to a cross head I59 mounted in a guide
slot IBI in the frame plate ‘I. A pin I62 extends
downwardly through the cross head I59 and joins
‘both the links I54 and I51 thereto. Similarly the
and supporting shaft 69 or ‘II as the case may
Similarly the motors 99 and I66 are each 25 gang of cutters 68 has connected thereto operat
be.
ing links I63 and I64 by means of a pin 65 which
provided with a pinion I96, only one being shown,
links, in turn, are connected to links I66 and I61
which mesh with a gear I91 mounted on the shaft
by means ofa pin I19. The links I66 and I61
69 or H, as the case may be, below the frame
are connected by means of a pin I66 to the cross
plate 1. The cutter chains on the gangs 61 and 68
head I59. A guide way I5I is formed in, and ex
are driven by their respective motors in opposite
tends along the frame plate 1, as shown in Fig.
directions as shown bythe arrows in Fig. 1 so that
11, the length of the links I54 and I51, It then
the. cutting by each gang is done by the outside
divides to form ?aring guideways I69 and I1I.
flight as it moves rearwardly.
These ?aring guideways I69 and HI accommo
All the jack screws 92, 93 and 95 above the
frame plate 1, may be driven in unison from a '
motor I98 mounted centrally of the machine
above the frame plate 1. Similarly, all of the
jack screws 92, 93 and 95, below the frame plate
1 may be driven in unison by means of a motor
IIi), mounted beneath the frame plate 1. Inas
much as the driving means for all the sets of
jack screws are identical, only one will be de
date the pins I56 and I19, respectively, which
connect the upper and lower links I52 and I53
and I63 and I64, respectively. The cross head I59
is projected forwardly and retracted rearwardly,
by means of a jack screw I 16 in threaded engage
40 ment therewith, which jack screw is mounted in
bearings I11 and I18, on the plate 1, and is pro
vided with a hand wheel I19 by means of which
scribed, having particular reference to Fig. 19.
it is operated. As will be seen in Fig. 11, the frame
shaft I23, which is supported in turn, from the
sume the dotted positions shown in Fig. 1, the
gangs of cutters 61 and 58 are spread apart to
plate 1 is cut out at I8I and I82 to provide room
Each of the motors I98 and I19, as may be seen
from Fig. 1, has a shaft on both ends, each of 45 for the jack screw I16 and wheel I19. It will be
seen from Fig. 1 that when the operating links
which drives three sprockets I99, III and H2.
I52 and I53 are retracted to the full line positions
Each of the sprockets I69, III and II 2 is con
shown, the gangs of cutters 61 and 68 are drawn
nected by means of a chain I I3 to a sprocket I I4
toward each other so that a cut of minimum width
mounted on a shaft i I5. As may be seen in Fig.
the shaft II5 has mounted thereon a pinion 50 is made. When the cross head I59 is moved for
wardly so that the operating links I52 and I63 as
§2I which meshes with a gear I22 mounted on a
jack screws 93 and 95. Mounted on the shaft
I23 are worms I24 and I26 which mesh respec
tively with worm gears I21 and I28 mounted re
spectively on the jack screws 93 and 95.
The shaft I23 also has mounted thereon a
their widest working positions.
It is contem
plated that when the gangs of cutters are in the
dotted positions shown in Fig. 1, the machine will
be propelled rearwardly and the pillars and sides
of a course already driven, broken down. Itwill
sprocket I29 which drives a shaft I3I mounted
thus be seen that by means of my improved ma
near the outer end of the housing 51, through a
chain I 32 and sprocket I33 mounted on said shaft 60 chine a mining operation may be carried on with
a minimum, or no timbering, as the timbering re
I3 I. The shaft I BI has mounted thereon a worm
quired will be that necessary to support the roof
I34 which meshes with a worm gear I36, carried
of a course at the rear of a machine, This tim
by the jack screw 92. The worm shaft I3I, as
bering will be removed as the machine moves
maybe seen in Fig. 21, is held against turning
rearwardly upon a reverse operation. A course
about the jack screws by a guide post I I6 mount
is driven while the machine is being propelled
ed above on the housing 51 which telescopes into
forwardly and the pillars at the side removed as
a sleeve II1 on the housing below, and which
the machine is being propelled rearwardly. It
coacts with the gear housing H8 for the worm
will be understood that it may sometimes be nec
gear I36. Interposed between the sprocket I29
essary to omit the mining of pillars where re
and the sprocket I33 are guide rollers I31 and I38
quired' to support structures, streams, or high
which are suitably mounted on the housing 51
ways on the ground above. This can readily be
so that the housing 51 may swing outwardly rel
done by means of my machine by bringing the
V ative to the housing 63, as shown in Fig. 1, with
gangs of cutters to the full line positions shown
out dislocating the chain I32 with respect to'the
in Fig. '1 and by then moving rearwardly to a
sprocket I29. The construction and manner of
2,407,448
7
point where the removing of pillars is to com
mence again, when the gangs of cutters 91 and
98 are again separated.
In order that the material may be removed
from the machine as it is broken down, I provide
8
and 2I9. It will be seen that as the material is
drawn rearwardly by the gangs of cutters 299
and 29I, it is thrown by rotation of the propellers
22I into the scoop 2I5.
Also mounted on each of ‘the shafts 2I8 and
conveying mechanism which will now be de
2 I9, is a cam 226 which, as the shaft rotates, en
scribed. Mounted centrally beneath the machine
gases the supporting link 2I6 and causes the
and supported from the frame thereof in any
scoop to reciprocate back and forth. A spring
suitable manner, not shown, is a conveyor I85
227 pulls the scoop 2I5 quickly forward when re
comprising a conveyor belt I86, mounted on pul 10 leased by the cam 226.
leys I81, only one being shown. The forward end
of the conveyor I 95 is just to the rear of the driv
ing and supporting shafts 69 and ‘II and in order
to remove the material broken down into its
path, I provide transversely extending screw con
veyors I 88 and I89 driven from a motor I99
mounted on the frame plate ‘I, and driving the
screw conveyors I 33 and I 99, respectively,
through sprockets I9I and I92, from sprocket
From the foregoing description the operation of
my improved mining machine will be readily un
derstood. The gangs of cutters 5'! and 69 or 299
and NI, as the case may be, are driven in the
directions shown by the arrows so that the outer
flight of each gang of cutters moves rearwardly.
When the machine is being propelled forwardly,
the gangs of cutters are brought to the positions
shown in Fig. 1 and Fig. 15, that is, as close to
chains I93. The ?ights of the conveyors I88 and :5. gether as possible, so that they assume a some
I89 are oppositely pitched so that coal is brought
what wedge shape, narrow at front, and .the
in from the sides toward the center, into the path
flights act to break ‘down the coal along the outer
of the conveyor E85. It is contemplated that the
sides the full length of both gangs and across
conveyor I85 will be in sections so that it may be
the front at the ends. When the course has been
lengthened and shortened as shown and described 25 driven :the desired length, the cutter gangs are
in my prior Patent No. 2,320,653, dated June 1,
spread outwardly to the dotted positions shown
1943.
in Fig. 1 and Fig. 15, whereupon the pillars at the
Referring now to Figs. 15, 17 and 18, I show a
sides of the course are removed. The machine
modi?ed form of my invention which, while in
when being propelled rearwardly, is supported
cluding the principal features heretofore de 30 from cave in by the pillars at the sides thereof
scribed, is somewhat simpli?ed and differs prin
and, as the coal is removed, the earth may be al
cipally in the manner of drive. In accordance
lowed to cave in behind the cutters as they recede,
with this modi?cation, I show gangs of cutters
except where necessary for support of the ground
299 and 29I which are similar to the gangs 81 and
_ above.
As the coal is broken down, it is picked
t8, already described, and which may be brought
up and removed by the conveyors shown. In
to the full line positions shown in Fig. 15, or
accordance with the modification shown in Fig.
spread apart to the dotted positions shown there
l, the depth occupied by the gangs of cutters 61
in, by means of operating links 292 and 293; which
and B8 or the distances between the cutter hous
links operate in a manner identical to the links
ings may be varied by means of the jack screws
I52 and I63, heretofore described and shown in 40 and mechanism for driving them shown therein
Fig. 1. In this modi?cation I show no means for
and the machine thus accommodated to seams of
separating the separate cutter chain housings
but these details have not been repeated for the
reason that the distinctive features of this modi
?cation may be better understood and illustrated
without them, In accordance with this modi
?cation the gangs of cutters 299 and 29I are
driven by means of two motors 295 and 2I9
mounted respectively above and below the frame
plate I. The motor 295 has on its shaft, which
protrudes from both ends thereof, worms 294 and
296 which mesh, respectively, with worm gears
201 and 298, mounted on gang supporting and
different thicknesses and friability; the greater
the friability, the greater the distance between
cutter housings.
With very thin seams, one or
:, two of the cutter housings may be removed.
From the foregoing it will be apparent that I
have devised an improved self propelled reversible
mining machine which is adapted to drive head
ings and air courses in mines while moving for
wardly and which shall be adapted on reverse
movement to remove the pillars alongside there
of. It will further be seen that I have devised
simple effective means for operating gangs of
driving shafts 299 and 2| I. ‘Likewise, the motor
cutter bars whereby said improved result may be
2 I9 drives Worms 2 I2, only one being shown, which 555 obtained.
mesh with worm gears 2I3, mounted on the sup
While I have shown my invention in but two
porting and drive shafts 299 and 2I I, beneath the
forms, it will be obvious to those skilled in the
frame plate ‘I.
art that it is not so limited, but is susceptible of
In accordance with this modi?cation I provide
various other changes and modi?cations, with
a different means for raising the material being
60 out departing from the spirit thereof, and I de
broken down by the gangs of cutters into the
sire, therefore, that only such limitations shall
conveyor I95. This means for raising the mate
be placed thereupon as are speci?cally set forth
rial comprises a scoop 2 I5 which is suspended by
in the appended claims.
means of links 2I6 from the frame plate ‘I. The
What I claim is:
bottom 2|‘! of the scoop is formed with a series
1. In a mining machine, a main frame, a pair
of inclined planes and vertical faces as shown in
of vertically disposed driving shafts mounted side
Fig. 17 so that when it is reciprocated, it pro
by side at the front of the frame, a. gang of cut
pells the material in it upwardly and delivers it
ters embodying a-plurality of cutter chain hous
into the conveyor I85. Mounted in suitable bear~
ings mounted on each of the shafts and extend
ings at the sides and in front of the scoop 2I5
ing forwardly therefrom, cutter chains mounted
are shafts 2I8 and ‘M9 upon which are mounted
in the housings and having cutter elements ex
propellers 22 I. The shafts 2 I8 and 2 I9 are driven
tending outwardly therefrom, means to drive the
by means of sprocket chains 222, mounted on
cutter chains from the drive shafts in opposite
sprockets 223, on the supporting and drive shafts
directions with the cutter elements on the outer
299 and 2H, and sprockets 224 on the shafts 2I8v 75 ?ights moving rearwardly toward the machine.
2,407,448
spreader arms adjustably mounted on the frame
between the gangs of cutters and pivotally con
nected to the gangs of cutters to vary the dis
tance between the outer ends of said gangs, a
pair of driving wheels mounted on opposite sides
of the frame, reversible means for driving the
wheels, and means to raise and lower each of the
driving wheels separately with respect to the
frame.
10
angle thereto, a pair of cutter gangs pivotally
mounted on the frame and extending forwardly
therefrom on opposite sides of the guideway, and
reciprocable links connected to the cutter gangs
and adapted to travel in the guideways for vary
ing the angular positions of the cutter gangs.
5. In a mining machine, a, main frame includ
ing longitudinal ‘beams and a plate spanning the
beams, a main guideway formed in the plate and
2. In a mining machine, a main frame, a pair 10 extending longitudinally thereof, ?aring branch
guideways connected to the forward end of the
main guideway and extending laterally at an
by side at the front of the frame, a gang of cut
angle thereto, a pair of cutter gangs pivotally
ters embodying a plurality of cutter chain hous- '
mounted on the frame and extending forwardly
ings mounted on each of the shafts and extend
ing forwardly therefrom, cutter chains mounted 15 therefrom on opposite sides of the guideway, re
of .vertically disposed driving shafts mounted side
ciprocable links connected to the cutter gangs
and adapted to travel in the guideways for vary
ing the angular positions of the cutter gangs, a
pair of driving wheels mounted on opposite sides
directions with the cutter elements on the outer
flights of each chain moving rearwardly toward 20 of the frame, reversible means for driving the
driving wheels, and means to raise and lower the
the machine, spreader arms. pivotally connected
driving wheels with respect to the frame.
to the gangs of cutters, a cross head to which the
6. In a mining machine, a main frame, gangs
inner ends of the spreader arms are pivotally
of cutters pivotally mounted on the main frame
connected, guide means for the crosshead carried
by the frame, a jack screw mounted on the frame 25 to project forwardly side by side from the main
frame and. eachcomprising a plurality of hous
and connected to the cross head and adapted to
ings having cutter chains mounted therein, jack
adjust the position of the crosshead, and rever
screws for separating the cutter chain housings,
silble means for driving the machine forwardly
said jack screws being disposed between the hous
and rearwardly.
ings, means to operate the jack screws in unison
3. Apparatus as de?ned in claim 2 in ‘combina
to vary the distances between the housings, an
tion with means for varying the distance between
extensible drive shaft for each of the gangs of
the cutter housings whereby to vary the vertical
cutters, means to drive the drive shafts in oppo
distance occupied by the gangs of cutter housings.
site directions whereby the outer ?ights of the
4. In a mining machine, a main frame includ
cutter chains move rearwardly toward the ma
ing longitudinal beams and a platespanning the
chine, and means to swing the gangs of cutters
beams, a main guide way. formed in the plate and
around their pivots to vary the relative distances
extending longitudinally thereof, flaring ‘branch
between the outer ends thereof.
guide ways connected to the forward end of the
ERSKINE RAMSAY.
main guide way and extending laterally at an
in the housings and having ‘cutter elements ex
tending outwardly therefrom, means to drive the
cutter chains from the drive shafts in opposite
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