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Патент USA US2107584

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Feb. 8, 1938.
T, Er PRAY
2,397,584
KERF CUTTING MACHINE
Filed Aug. 7, 1936
4 Sheets-Sheet l
Feb. 8, 1938.
AT. E. PRAY
` 2,107,584
KERF CUTTING MACHINE
Filed Aug. '7, 1956
wäw@
4 Sheets-Shee‘t 2
Feb. 8, 1938.
2,107,584
T. E. PRAY
KERF CUTTING MACHINE
Filed Aug. 7, 1936
4 Sheets-Sheet 3
l
l.\|IlIl|lIÍ|l
_
Feb. 8, 1938.
_T, E, PRAY
2,107,584
KERF CUTTING MACHINE
Filed Aug. '7, 1936
4 Sheets-Sheet 4
ma?. P
¿53%,
Patented Feb. 8, 1938
2,107,584
UNITED STATES PATÈNT ÓFFICÈ
v42,107,584
REEF-CUTTING MÀC’HÍNÉ
Thomas lE. Pray, Chicago, Ill., assignerl Ito Goodà
man Manufacturing Company, Chicago, Ill., à
corporation of Illinois
Application August -"i, 1936, Serial No. 94H38
i6 Claims. (Cl. 262---28)
5
This invention relates to improvements in
kerf-cutting machines of the track mounted type
port for a cutting element generally indicated
adapted to cut out dirt rashes or bands in the
mine wall along the mine bottom or at various
by reference character I2 and including a pair
of parallel spaced projecting cutter bars. I3
elevations with respect thereto.
and
at its forward» end. Said turntable forms a supá
I4.v
_
_
_
_
_
‘I’he principal objects of my invention are to
provide a mining machine of the class described
which may cut above and below dirt rashes or
bands of varying thicknesses in the coal seam.
support means for the cutting _ element, also
serves as a power driven means rfor feeding the
Another object of my invention is to provide
along the track-_ The turntable I I _forms a means
a novel means for supporting the cutter bars
for positioning said cutter bars _in the desired
position with respect to the coal vface forcuttihg
and also forms a means for feeding Vsaid outtei`
for adjustment with respect to each other and
with respect to their supporting frame, together
with a novel means for adjusting the cutter bars
“ and holding them in adjusted relation with re-v
spect to each other.
My invention may be more clearly understood
with reference to the accompanying drawings
wherein:
Figure 1 is a top plan view of a mining machine
constructed in accordance with my invention;
Figure 2 is an enlarged fragmentary side ele
vation of the forward portion of the machine
shown in Figure 1 with parts broken away and
shown in longitudinal section in order to more
clearly illustrate certain details of my invention;
Figure 3 is an enlarged fragmentary plan view
of the forward portion of the device shown in
Figure 1 with certain parts broken away and
shown in horizontal section;
,
Figure 4 is a fragmentary side elevation of the
forward portion of the device shown in Figure
1, drawn to the same scale as Figure 2, but with
certain other parts broken away and shown in
longitudinal section;
Figure 5 is a fragmentary sectional view taken
substantially along lines 5--5 of Figure 3;
Figure 6 is a fragmentary sectional View taken
substantially along lines 6-6 of Figure 2;
Figure '7 is a sectional view taken substantially
along lines 'I-1 of Figure 2;
Figure 8 is a sectional view taken substantially
along lines 8_8 of Figure 2;
Figure 9 is a sectional view taken substantially
‘ along lines 9-9 of Figure 2;
Figure l0
plan view of
and
Figures 1l
the machine
is an enlarged detail fragmentary
a portion of the upper cutter bar;
and l2 are diagrammatic views of
showing the cutter bars in various
operative positions.
The truck I0, _besides serving as a movable
cutter bars I3_ and I4 into the coal by movement
bars across' the coal face in a manner well known
to those skilled in the art and not herein shown `
or described since it is no portion of my present
invention.
‘The cutting 'element I2 includes an elevating
frame I5 which is mounted on the turntable II
in a pair of parallel spaced 'guides I6, I6 for ver 20
tical adjustment with respect thereto. A for
wardly projecting cutter frame I'l is pivotally
mounted on said elevating frame for movement
about a horizontal transverse axis disposed ad
jacent the forward end thereof. Said cutter
frame has a motor I8 secured thereto and ex
tending rearwardly therefrom between the sides
of said elevating frame. A suitable adjusting
screw, generally indicated by reference charac
ter I9, is provided for adjusting the angle of 30
said cutter frame with respect to said elevating
frame and the angle of the cutter bars I3 and I4
with respect to the ground. Said adjusting screw
and the means for operating it is only herein
referred to generally inasmuch as it is of a usual 35
construction and is no portion of my present
invention.
The elevating frame I5 is adjustably moved
with respect to the turntable II by means of a
transverse shaft 20 coaxial with the axis of piv
otal movement of said cutter frame. Worms 2|,
2| are secured to opposite ends of said trans
verse shaft and mesh with and drive worm gears
22, 22 on the forward ends of longitudinally
extending shafts 23, 23 (see Figures 2 and 5).
Said longitudinally extending shafts have paral
lel spaced pinions 24, 24 keyed thereto which are
adapted to mesh with vertical racks 25, 25 ex
tending upwardly along the guides I6, I6. Said
worms and worm gears are of the self-locking
type for holding said elevating frame in ñxed
relation with respect to said turntable in the
Referring now in particular to the drawings
and the details of the embodiment of my inven
tion illustrated therein, a track mounted truck
usual manner.
In is provided which has a turntable II mounted
motor I 8 by means of a jaw clutch member 26
v
The transverse shaft 20 is driven from the
2
2,107,584
which means, as herein shown, comprises a lock
versely driven through suitable reverse gearing
which includes a pair of friction clutches 29, 29
ing pin 55 adapted to engage any one of a plu
rality of apertures formed in the outer Vperiphery
on a longitudinal shaft 3i) and gear trains SI
and 32 driven therefrom so that when one of
of the annular ring 53. Said locking pin is en
gaged with or disengaged from the desired aper~
ture by means of a hand lever 52 pivoted to the
support frame 36 on a pivotal pin 53 and having
said gear trains is connected with said shaft by
its respective friction clutch 29 the longitudinal
shaft 28 will be driven in one direction, and
10 when the other gear train is connected with the
shaft 30, the longitudinal shaft«23 will be driven>
in an opposite direction. The shaft 23 is in
turn driven from the forward end of the motor
I8 by means of a suitable spur gear train gener
15 ally indicated by reference character 33.
The cutter frame I1 is provided with a pair
of parallel spaced guiding tongues 34, 34 which
extend outwardly therefrom and depend from
opposite sides thereof forwardly of the forward
20 end of the truck (see Figure 3). Said guiding
tongues are adapted to register for engagement
with guide grooves 35, 35 formed in a pair of
parallel spaced support Vmembers 35a, 35ab ex
tending rearwardly and outwardly from a support
25 frame 36 for the cutter bar I3. Said support
frame is likewise provided with a pair o-f parallel
spaced guiding tongues 31, 31 extending laterally
from thev outer sides of the'support members
35a, 35EL which are adapted to engage suitable
30 guide grooves 38, 38 formed in support members
38a, 38a extending rearwardly from a supporting
frame 39 for the cutter bar It. -
The forward end of the supporting frame 36
has an adjusting screw 45 pivotally connected
35 thereto which is threaded within a threaded sleeve
4I, which sleeve in turn is threaded within a
threaded hub of a worm gear 42.
Said worm
gear is journaled in the forward end of the cutter
frame I1 in a suitable manner and is meshed
40 with and driven from a- worm 43 on the forward
end of the longitudinally extending shaft 2B
(see Figure 3). Said worm is selectively con
nected with said shaft by means of a suitable
jaw clutch member 44.
'
With reference ynow in particular to the details
of the cutter bar supporting means and several of
the novel featuresof my invention, the upper
cutter bar I3 is mounted in a frame member 50
having an annular shouldered portion 5I adapted
50 to engage an inwardly extending annular flange
52 of the supporting frame 3B. Said shouldered
portion is held in engagement with said ñange
by means of an annular ring 53 secured to the
upper side of -said frame member yin a suitable
manner.
ï
-
The frame member 5i! is provided with parallel
spaced inwardly disposed depending walls 5d, 5f!
at its forward end. The space between said walls
forms a slot which is adapted to be engaged by an
60 upwardly projecting member 55 of the lower cut
ter bar I4. Said member is formed integral with
a cutter bar support member 56 for the lower
cutter bar I4 for guiding said last named cutter
bar for adjustable movement towards or from
65
cutter bars I3 and It from pivotal movement,
and a helical gear train 21 driven from a longi
tudinal shaft 28. Sai-d longitudinal shaft is re
the upper cutter bar I3 and for holding said
cutter bars so they may be pivotally moved to
gether.
its free end engaging said locking pin. Thus,
said cutter bars may be pivotally moved together 10
about the
of the frame members 5B and 56
to permit the disposal of the lower cutter bar
along the bottom to one side of the track and thus
permit a kerf to be cut by the lower cutter bar
along the mine bottom to each side of and in CA
front of the track,
The upper cutter bar I3 is mounted in hori
zontally disposed slots 643, 51E» on opposite sides of
the walls 5t, 5ft for adjustable movement with
respect to said support member. A suitable ad 20
justing screw 55 is threaded in said cutter bar
and abuts the forward end of said support mem
ber and forms a means for taking up slack on a
cutter chain 56 .movable about said cutter bar.
The lower cutter bar It is mounted in the
cutter bar support frame 5G in a similar manner
and adjustment is effected by means of an ad~
justing screw 51 which serves to permit the tak
ing up of slack in a cutter chain 58 movable about
said cutter bar.
The cutter chain 55 is trained around and
driven from a drive sprocket 69 on the lower end
of a sleeve 10, which sleeve is journaled in the
frame member 55 by means of suitable ball bear
ings in a usual manner.
In a like manner, the cutter chain 58 is trained
around a drive sprocket 12 on the lower end of
a sleeve 13, which sleeve is journaled in the cutter
bar support member 5t on suitable ball bearings
in a usual manner.
40
The sleeves 1@ and 13 are internally splined
and are adapted to be slidably engaged by a
splined shaft 15. Said shaft in turn slidably
engages a splined sleeve 16 journaled in the cutter
frame I1 and having a bevel gear 11 mounted
thereon. Said bevel gear is meshed with and
driven from a bevel pinion 18 on the forward
end of the longitudinally extending shaft 30 for
driving said cutter chains about said cutter bars.
Adjustment of the cutter bar I ¿I with respect
to the cutter bar I3 is effected by means of an
adjusting screw 19 pivotally mounted in the cut
ter bar support frame 55 on a pivotal pin 35 dis
posed forwardly of the guides 38, 38 and rear
wardly of the guides formed by the walls 5d, 5t ,ç
(see Figures 2 and 7). Said adjusting screw is
threaded within a threaded ‘nub- of a worm gear
8i which worm gear is journaled on its hub in a
bearing and support frame 33 secured to and de
pending from the frame member 59. A worm (39
84 meshes with the worm gear 8l and may be
rotatably driven by a suitable hand crank in a
usual manner (not shown).
With reference now in particular to Figures
11 and l2, illustrating the cutter bars in several
operative positions, in Figure ll the lower cutter
bar lli is positioned for> cutting adjacent the
The cutter bar support member 55 is similar to
thecutter bar support member 5d and is held in
engagement with an annular ilange 51 of the
supporting frame 39 by means of an annular ring
59 secured to the upperside of said cutter bar
support member and abutting the upper surface
of said annular flange.
ground, which may be along the bottom of the dirt
band, while the upper cutter bar I3 is positioned
for cutting along the top of the dirt band so that
the two bars may completely cut out the dirt
Suitable means are provided for locking the
only vertically adjusted with respect to each other
band in a coal seam.
It is apparent from the
foregoing that during the cutting operation the
cutter bars operate as a unit and that they are
2,107,584
where the thickness of the dirt band varies, which
condition usually occurs only in different parts
of the mine and not in the same working place.
In Figure 13 the cutting element has been
raised to an extreme uppermost position along
the guides I6, I6 and the cutter bars I3 and I4
are spaced closer together than in Figure 1 for
cutting out a band of a different thickness from
the center of the coal seam. It should herein be
10
understood that, if desired, the entire cutting
mechanism may be inverted in the guides I6, IS
to permit the lower cutter bar I4 to cut a kerf
along the roof and permit the upper cutter bar I3
4to cut a kerf spaced downwardly therefrom, or a
cutting element of the type having a rotatable
head such as is shown in Patent No. 2,027,456,
granted to William W. Sloane on January 14,
1936, may be used to permit the cutter bars to be
inverted to cut along the roof as well as along
20 the bottom.
It may now be seen that a new and improved
mining machine has been provided having a pair
of parallel spaced cutter bars adapted to cut out
dirt seams in> the mine wall of varying thick
nesses and that -said cutter bars are supported in
a simple and e?licient manner for adjustment
with respect to each other and for adjustment
with respect to an overhanging supporting
frame and also for adjustment with respect to a
30 supporting truck which effects an arrangement
whereby dirt bands may be cut out in varying
locations in the mine wall.
It may also be seen
that a new and improved support and adjusting
means has been provided for the cutter bars which
35 is of a simplified construction and permits the
cutter bars to cut as a unit.
While Ihave herein shown and described one
form in which my invention may be embodied, it
will be understood that the construction thereof
40 and thel arrangement of the various parts may be
altered without departing from the spirit and
scope thereof. Furthermore, I do not wish to be
construed as limiting myself to the specific em
bodiment illustrated, excepting as it vmay be
45 limited in the appended claims.
I claim as my invention:
1. In a mining machine, a frame, and a pair
of cutter bars having cutter chains movable
thereabout, mounted on said frame for simul
50 taneous adjustable pivotal movement about co
axial vertical axes disposed adjacent their rear
ward ends, means for mounting said cutter bars
for simultaneous vertical adjustment with re
spect to said frame and means interposed be
55 tween said cutter bars for adjustably moving one
of said cutter bars with respect to the other.
2. In a mining machine, a frame, and a pair
of cutter bars having cutter chains movable
thereabout, mounted on saidv frame for adjust
60 ment about coaxial vertical axes disposedV ad
jacent their rearward ends, said cutter chains
being driven from a common drive shaft coaxial
with their axis of pivotal adjustment, means for
mounting said cutter bars for simultaneous ver
65 tical adjustment with respect to said frame,
means interposed between said cutter bars for
adjustably moving one of said cutter bars with
respect to the other and a slidable guide connec
tion between said cutter bars to hold said cutter
70 bars for simultaneous pivotal adjustment with
respect to said frame.
3. In a track mounted mining machine, a
truck, a turntable thereon, a frame mounted on
said turntable for Vertical adjustment with re
75 spect thereto, and a pair of parallel spaced cut
3
ter bars projecting from said frame, said cutter
bars having cutter chains movable thereabout„
means for mounting said cutter bars for aligned
vertical adjustment with respect to each other,
and a slidable guide connection between said cut
ter bars to hold said cutter bars for pivotal ad
justment together.
4. In a track mounted mining machine, a truck,
a turntable thereon, a frame projecting forwardly
of said turntable and mounted thereon for ver 10
tical adjustment with respect thereto, a pair of
parallel spaced depending horizontal cutter bars
mounted on said frame for adjustment about a
common vertical axis and for adjustment towards
and from said frame, and means interposed be
tween said cutter bars for adjustably moving one
of said cutter bars with respect to the other.
5.A In a track mounted mining machine, a
truck, a turntable thereon, a frame projecting
forwardly of said turntable and mounted thereon 20
for vertical adjustment with respect thereto, a
pair of parallel spaced depending horizontal cut
ter bars mounted on said frame for simultaneous
adjustable movement about a common vertical
axis to permit the lowermost of said cutter bars 25
to cut below the level of the rail along the mine
bottom, said cutter bars being mounted for ad
justment towards and from said frame, and means
interposed between said cutter bars for adjustably
moving said lowermost cutter bar towards and 30
from said upper cutter bar.
6. In a mining machine, a frame, a pair of
cutter bars having cutter chains movable there
about ‘mounted on said frame for adjustment
about a common vertical axis disposed adjacent 35
their rearward ends, and a supporting and
guiding connection between said frame and cut
ter bars to permit said cutter bars to be adjusted
towards and from said frame and towards and
from each other comprising a pair of parallel
spaced guides depending from said frame, a cut
terV bar supporting frame having said ñrst-men
tioned cutter bar pivotally connected thereto
and projecting therefrom, and a slidable guid
ing connection between said guides and frame, a
pair of guides on said cutter bar supporting
frame, and a second cutter bar support frame
for supporting said other cutter bar and having a
slidable guiding connection with said guides on
said first-mentioned cutter bar supporting frame. »
'7. In a mining machine, a frame, a pair of
cutter bars having cutter chains movable there
about mounted on said frame for adjustment
about a common vertical axis disposed adjacent
their rearward ends, and a supporting and guid 155
ing connection between said frame and cutter
bars to permit said cutter bars to be adjusted
towards and from said frame and towards and
from each other comprising a pair of parallel
spaced guides depending from said frame, a cut
ter bar supporting frame having said first-men
tioned cutter bar pivotally connected thereto and
projecting therefrom, and a slidable guiding con
nection between said guides and frame, a pair
of guides on said cutter bar supporting frame,
and a second cutter bar support frame for sup
porting said other cutter bar and having a slid
able guiding connection with said guides on said
first-mentioned cutter bar supporting frame, and
mechanisms disposed forwardly of and inter 70
mediate said guides for moving said cutter bars
towards and from said frame and towards and
from each other.
8. In a mining machine, a frame, a pair of
cutter bars having cutter chains movable there
75
2,107,584
about mounted on said frame for adjustment about
~a common vertical axis disposed adjacent their
rearward ends, and a supporting and guiding con
nection between said frame and cutter bars rto
permit said cutter bars to be adjusted towards
and from said frame and towards and from each
other comprising a pair of parallel spaced guides
depending from said frame, a cutter bar support
ing frame having said ñrst-mentioned cutter bar
10 pivotally connected thereto and projecting there
from, and a slidable guiding connection between
said guides and frame, a pair of guides en said
cutter bar supporting frame, and a second cut
ter bar support frame for supporting said other
15 cutter bar and having a slidable guiding connec
tion with said guides on said iirst-mentioned cut
ter bar supporting frame, adjusting mechanism
disposed forwardly of said guides and interposed
between said frame and first-mentioned cutter
20 bar supporting frame for moving both of said
cutter bars towards and from said frame, and
other adjusting mechanism interposed between
said cutter bars for moving said cutter bars to
wards and from each other.
25
9. In a track mounted mining machine, a truck,
a turntable thereon, a frame mounted on said
turntable for vertical adjustment with respect
thereto, a pair of parallel spaced guides depending
from said frame, a cutter bar supporting frame
30 mounted for movement therealong, and means
disposed forwardly of and intermediate said
guides for moving said supporting frame towards
and from said ñrst-mentioned frame, said sup
port frame having a chain carrying cutter bar
35 projecting therefrom' and mounted for pivotal
movement
respect thereto about an axis
perpendicular to its cutting plane, a pair of
parallei spaced guides extending along said sup
port frame, said guides having a second cutter bar
supporting frame guided for movement there
along, and said second-mentioned supportframe
having a projecting chain carrying cutter bar
mounted thereon for pivotal movement with re
spect thereto about an axis perpendicular to its
45 cutting plane, and means disposed forwardly of
said guides for adjustably moving said cutter
bars towards and from' each other.
10. In a track mounted mining machine, a
so
truck, a turntable thereon, a frame mounted on
said turntable for vertical adjustment with re
spect thereto, a pair of parallel spaced guides
depending from said frame, a cutter bar support
ing frame mounted for movement along said
guides, and means disposed forwardly of and
55 intermediate said guides for moving said sup
porting frame towards and from said first-men
tioned fram-e, said support frame having a chain
carrying cutter bar projecting therefrom and
mounted for pivotal movement with respect
l60 thereto about an axis perpendicular to its cutting
11. In a track mounted mining machine, a
truck, a turntable thereon, a frame mounted on
said turntable for vertical adjustment with re
spect thereto, a pair of parallel spaced guides de
pending from said frame, a cutter bar supporting 5
frame mounted for movement therealong, and
means disposed forwardly> of and intermediate
said guides for moving said supporting frame to
wards and from said ñrst-mentioned frame, said
support frame having a chain carrying cutter 10
bar projecting therefrom and mounted for pivotal
movement with respect thereto about an axis
perpendicular to its cutting plane, a second cut
ter bar support frame disposed beneath said ñrst
mentioned cutter bar support frame and having
a projecting chain carrying cutter bar mounted
thereon for pivotal movement with respect there
to about an axis perpendicular to its cutting
plane, and means interposed between said cutter
bars for adjustably moving said second-men 20
tioned cutter bar towards or from said first-men
tioned cutter bar.
12. In a track mounted mining machine, a
truck, a turntable thereon, a frame mounted on
said turntable for vertical adjustment with re 25
spect thereto, a pair of parallel spaced guides de
pending from said frame, a cutter bar support
frame mounted for movement therealong, and
means disposed forwardly of and intermediate
said guides for moving said support frame to 30
wards and from said ñrst-mentioned frame, said
support frame having a chain carrying cutter
bar projecting therefrom' and mounted for pivotal
movement with respect thereto about an axis per
pendicular to its cutting plane, another cutter 35
bar support frame disposed beneath said first
mentioned cutter bar support frame and having
a projecting chain carrying cutter bar mounted
thereon for pivotal movement with respect there
to about an laxis perpendicular to its cutting 40
plane, means interposed between said cutter bars
for adjustably motdng said second-mentioned
cutter bar towards or from said ñrst-mentioned
cutter bar, and slidable guide means interposed
between said cutter bars for guiding said cutter 45
bars for movement towards or from each other
and holding said cutter bars from lateral dis
placement with respect to each other during the>
cutting operation.
13. In a mining machine, a frame, a pair of v50
cutter bars having cutter chains movable there
about mounted on said frame for adjustment
about a common vertical axis disposed adjacent
their rearward ends, and a supporting and guid
ing connection between said frame and outter
bars to permit said cutter bars to be adjusted
towards and from said frame and towards and
from each other comprising a pair of parallel
spaced guides depending from said frame, a cut
55
ing said cutter bars for pivotal movement as a
ter bar supporting frame having one of said cut 60
ter bars pivotally connected thereto and pro
jecting therefrom, and a slidable guiding connec
tion between said guides and cutter bar support
frame, a second cutter bar support frame dis
posed beneath said ñrst-mentioned frame form 65
ing a support means for said other cutter bar,
means disposed forwardly of said guides and in
terposed between said ñrst-mentioned frame and
support frame for movincr said cutter bars to
wards or from said frame, and means interposed 70
between said cutter bars for adjustably moving
said second-mentioned cutter bar towards and
from said first-mentioned cutter bar.
unit when in various positions of adjustment with
~75 respect to each other.
hanging the forward end of said base, av cutter 75
plane, a pair of parallel spaced guides extending
along said support frame, said guides having a
cutter bar supporting frame guided for movement
therealong, and said second-mentioned support
65 frame having a projecting chain carrying cutter
bar mounted thereon for pivotal movement with
respect thereto about an axis perpendicular to its
cutting plane, means disposed forwardly of said
guides for adjustably moving said cutter bars
70 towards and from each other, and slidable guid
ing means interposed between said cutter bars
and disposed forwardly of said guides for hold
14. In a mining machine, a base, a frame over
5
` 2,107,584
bar mounted for slidable movement towards and
cutter bars having cutter chains movable there
from said frame, a second cutter bar mounted
about mounted on said frame for adjustment
about a common vertical axis disposed adjacent
their rearward ends, and a supporting and guid
ing connection between said frame and cutter
bars to permit said cutter bars to be adjusted
towards and from said frame and towards and
from each other comprising a pair of parallel
spaced guides depending from said frame, a cut
ter bar support frame having one of said cutter
bars pivotally connected thereto and projecting
therefrom, and a slidable guiding connection
between said guides and frame, a second cutter
bar support frame disposed beneath said first
mentioned support frame forming a support
means for said other cutter bar, means disposed
forwardly of said guides and interposed between
said first-mentioned frame and support frame
for moving said cutter bars towards and from
said frame, means interposed between said cutter
bars for adjustably moving said second-men
tioned cutter bar towards and from said ñrst
mentioned cutter bar, and slidable guide means
interposed between said cutter bars for guiding
for slidable movement towards and from Ysaid
ñrst cutter bar, means interposed between said
CTI frame and first-mentioned cutter bar for mov
ing both of said cutter bars towards and from
said frame, and means interposed between said
cutter bars for independently moving said sec
ond-mentioned cutter bar towards and from said
10 first-mentioned cutter bar.
15. In a mining machine, a base, a frame over
hanging the forward end of said base, a pair of
guides disposed forwardly of said base and de
pending from said frame, a cutter bar support
frame
having
guides
extending
therefrom
mounted for movement along said guides, a cut
ter bar projecting from said frame, another cut
ter bar support frame having guides extending
therefrom guided for movement along the outer
side of said guides of said other support frame,
a cutter bar projecting from said frame, means
interposed between said overhanging frame and
ñrst-mentioned cutter bar for moving both of
said cutter bars towards and from said frame,
25 and means interposed between said cutter bars
for independently Ymoving said second-men
tioned cutter bar towards and from said first
mentioned cutter bar.
16. In a mining machine, a frame, a pair of
5
10
15
20
said cutter bars for movement towards or from 25
each other and holding said cutter bars from
lateral displacement with respect to each other
during the cutting operation.
THOMAS E. PRAY.
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