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Патент USA US3088730

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May 7, 1963
_
E. J. HLINSKY
3,088,720
CUTTER BIT CLUSTER SUPPORT
Filed Oct. 15, 1959
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United States Patent Office
1
3,688,720
CUTTER BIT CLUSTER SUPPGRT‘
Emil J. Hlinsky, La Grange Park, Ill., assignor to Good
man Manufacturing Company, Chicago, 1711., a corpora
tion of Illinois
Filed Oct. 15, 1959, Ser. No. 846,699
2 Claims. (Cl. 262—26)
3,688,720
Patented May 7, 1963
2
tinuous mining machines, in which a plurality of laterally
spaced boring heads make contiguous boring cuts in a
mine face, as the boring heads are rotatably driven and
axially fed into the mine face.
The boring head 10 includes a radially extending arm
11, extending radially from a hub 12, rotatably driven
from a longitudinally extending drive shsaft 13, rotatably
supported in a gear casing (not shown) of a continuous
mining machine.
This invention relates to improvements in cutting de
The arm 11 has a central cutter support 15 and an
vices for coal and the like, and more particularly relates 1O
intermediate cutter support 16 extending outwardly there
to an improved mounting means for the cutters of con
from in radially spaced relation with respect to each
tinuous mining machines.
other. The cutter supports 15 and 16 are generally
A principal object of the present invention is to pro
arcuate in end view and conform to the arc of travel
vide a novel and improved mounting means for the bits
of a boring type of continuous mining machine, mount 15 thereof, and have cutter bits 17 projecting forwardly
therefrom, for cutting radially spaced annular kerfs in
ing the bits in clusters for replacement as a unit.
the mine face. The cutter supports 15 and 16 are shown
A further object of the invention is to provide a bit
as having wedges 19 and 20 respectively extending from
mounting means for mounting the bits for the boring
the outer sides thereof, to enter the kerfs cut by the
heads of continuous mining machines in clusters ar
ranged with a view toward simplicity and e?iciency and 20 bits ‘17 and break down the cores between the supports
15 and 16, and between the support v16 and an outer
ready detachability from the rotary boring head of the
peripheral cutter support 21.
machine, to replace the dull bits with sharp bits in a
The outer peripheral cutter support 21 extends for
cluster.
wardly from a radial arm 22, telescopically mounted
A still further object of the invention is to provide
a bit support block for the bits of a continuous mining 25 within the arm 11 for radial adjustment with respect
thereto, to vary the cutting diameter of the boring head.
machine so arranged as to retain a cluster of the cutter
The peripheral cutter support 21 may be adjustably
bits thereto by the wedging action between the bits and
moved with respect to the cutter support 16 by suitable
their bit receiving slots, and having interengaging con
adjustment means (not shown), which is no part of the
nection with the cutter support of a boring head for a
continuous mining machine, providing an uninterrupted
present invention so is not herein shown or described
surface on the cutter support and accommodating ready
removal and replacement of the bit support block.
Still another object of rthe invention is to provide an
improved form of support means for the cutter bits of
continuous mining machines and the like, in which the
bit support block is detachably recessed within the cut
further.
The cutter support 21 is shown as ‘being generally
arcuate in end view, to conform to the cutting radius
the support block comprise generally rectangular slots
vance face thereof, are provided to retain the cutter bits
of said cutter support, and has a ledge 23 extending from
the advance edge thereof having a plurality of bit slots
24 leading therethrough for supporting cutter bits 25.
The cutter bits 25 are spaced along the ledge 23 and ex
ter arm of a continuous mining machine and has inter
tend
radially outwardly therefrom to trim the bore and
engagement therewith and forms a continuation of the
face of the cutter support of a continuous mining ma 40 cut clearance for the peripheral cutter support 21. Set
screws 26, threaded within the ledge 23 from the ad
chine, and in which the retaining means for the bits in
leading thereinto from the outer end thereof and termi
nating into drilled and cross-drilled holes, the rectangu
lar slots having tapered advance faces Cooperating with
corresponding faces on the bits, for holding the bits in
position by the taper thereof, and the drilled and cross
drilled holes accommodating ready removal of the bits
from their slots.
These and other objects of the invention will appear
from time to time as the following speci?cation pro
ceeds and with reference to the accompanying drawings
wherein:
FIGURE 1 is a fragmentary view in side elevation of
25 in position.
The peripheral cutter support 21 has a recess 27 there—
in, open to the front and sides of said cutter support, for
detachably supporting a cutter bit support block 29, sup
porting a plurality of cutter bits 30 in a cluster, as will
hereinafter more clearly appear ‘as this speci?cation
proceeds.
The recess 27 has grooves .31 extending along opposite
ends thereof, from the outer to inner side thereof and
slidably receiving tongues 33 extending from opposite
ends of the bit support block 29. The tongues 33 stop
short of the inner ends of the grooves 31 and are beveled
a boring head of a continuous mining machine having 55 at their inner end portions, as indicated by reference
character 34, to accommodate insertion of the cutter bit
a bit mounting means constructed in accordance with
support block 29 within the recess 27, with an outer
the invention on the outer cutter support thereof;
plane face 35 thereof, flush with the outer face of the
FIGURE 2 is an enlarged fragmentary front end view
peripheral cutter bit support 21.
of the outer cutter support, illustrating the bit mounting
Mating arcuate recesses 36 and 37 are provided in
means of the invention in end view; and
the tongues 33 and in the peripheral cutter support 21
FIGURE 3 is an enlarged ‘fragmentary top plan view
and open toward the grooves 31, respectively, to receive
of the outer cutter support shown in FIGURE 1, with
locking pins 39 for locking the cutter bit support block
certain parts thereof broken away and shown in section,
29 in position within the recess 27. It should be under
showing the bit mounting block in position in the cut
stood that the recess 37 is formed by a drilled hole,
ter support, with certain parts broken away and in sec 65 drilled through the peripheral cutter support 21 and in
tion, in order to illustrate the self-retaining mountings of
tersecting the groove 31, to accommodate the locking pin
the cutter bits in the bit supporting block.
39 to be placed therein and thereby lock the cutter bit
In the embodiment of the invention illustrated in the
support block in position within the recess 27.
drawing, reference numeral 10 generally designates a
The locking pin 39 has a bendable locking rod or
rotatable boring head of a boring type of continuous 70
wire 40 extending axially therethrough beyond opposite
mining machine. The boring head 10 may be of a well
ends thereof. The projecting ends of the locking wire
known form commonly used on boring types of con~
3,088,720
3
4
40 may be bent over to register with outwardly opening
locking slots 41, in opposite faces of the peripheral cutter
c. a generally rectangular recess in said cutter support
support 21, and opening to the drilled portions thereof
forming the recesses 37.
When it is desired to remove the bit mounting block
from the recess 27, it is merely necessary to straighten
one bent end of each locking wire 40, and to then remove
opening to the front and opposite sides thereof,
d. said recess having opposite parallel end walls hav
ing grooves extending therealong in the direction of
the axis of rotation of said boring arm,
e. a bit carrying block insertable within said recess and
having a plurality of spaced cutter bits carried there
by and projecting forwardly therefrom,
the pins 39 from the registering arcuate recesses 36
and 37.
The bit mounting block 29‘ is shown as having three 10
outwardly opening bit holding slots 43 extending there
1‘. said bit carrying 'block having opposite parallel end
walls conforming to the end walls of said recess, and
g. means for retaining said block within said recess,
through, one center slot opening through the face 35, and
comprising
the other slots being inclined at opposite angles with re
h. tongues projecting from and extending along said
spect to each other and opening to oppositely inclined
parallel end walls of said bit carrying block and
faces 44, to position the leading and trailing cutter bits 15»
registerable with said grooves in said cutter support
30 to each side of the center bit 30, to cut clearance for
i. and spaced locking pins extending through said
theperipheral cutter support 21.
cutter support and intersecting said recess and hav
Each slot 43 is generally rectangular in cross-section
ing inter engagement with said tongues, said locking
and is formed by ?rst drilling a hole 45 from the outer
pins being within the con?nes of said cutter support
to inner end of the block 29‘, and then broaching the slot
when said block is locked therein.
to a position terminating in spaced cross-drilled holes 46,
2. In a bit mounting device particularly adapted for
forming the bottom of the slot and accommodating the
the boring heads of continuous mining machines and the
cuttings to drop out of the slot, to thereby render the
like having
slot self-cleaning, as Well as to accommodate removal
of the bit 30 by a pry bar or the like.
The slot 43 has a forwardly inclined rear wall 47,
engaging the rear wall of the bit 30 and pitching the bit
30 at the proper cutting angle. ‘Said slot also has a for
wardly tapered front wall 49 conforming to a front
tapered face 50 of the bit 30, and retaining the bit 38 3O
within the slot 43 upon hitting the bit with a blow from
a hammer and the like. The taper of the face 50 of
the bit 30 is greater than the angle of the Morse taper,
but is less than the angle of friction slip of steel on steel
and may be in the range of 41/2 ‘’ to 61/2 °.
Such a taper 35
will efficiently hold the cutter bits within their slots when
a. a rotatable boring arm having
b. a cutter support extending forwardly therefrom and
having spaced circumferential surfaces generally con
9
forming to the arc of rotation of said support,
a generally rectangular recess in said cutter support
opening through said circumferential surfaces and
to the front of said cutter support,
d. said recess having parallel end walls having grooves
recessed therein and opening toward each other and
extending in the direction of the axis of rotation of
said boring arms
e. a generally rectangular bit carrying block insertable
within said recess and having a plurality of spaced
driven therein by the blow of a hammer, and will accom
modate ready removal of said bits from their slots.
cutter bits carried thereby and projecting forwardly
therefrom,
prising
It may be seen from the foregoing that a simple and
efficient bit mounting means has been provided for mount
1‘. means retaining said block within said recess, com
ing the ‘bits of a continuous mining machine and the
like in clusters, and accommodating ready removal of
g. tongues projecting from opposite ends of said block
for registry with said grooves,
the mounting means with a cluster of bits.
It may further be seen that the bit mounting means
is recessed within the bit support and thereby does not
‘h. apertured portions leading through the said circum
interrupt the surface thereof, and that the bit receiving
slots cooperate with the bits to retain the bits in posi
tion ‘by the wedging action between the bits and slots
.and terminate in cross-drilled holes, drilled through the
bit mounting means, to accommodate self-cleaning there
of and ready removal of the bits from the bit mounting
means by the use of a pry bar or the like.
While I have herein shown and described one form in
which my invention may be embodied, it should be un
derstood that various modi?cations end variations in the 55
invention may be effected without departing from the
spirit and scope of the novel concepts thereof, as de?ned
by the claims appended hereto.
I claim as my invention:
1. In a bit mounting device particularly adapted for 60
the boring heads of continuous mining machines and the
like having
.
a. a rotatable boring arm having
b. a cutter support extending forwardly therefrom and
ferential surfaces of said grooves and forming cir
cumferential recesses in the end walls of said grooves,
i. circumferential recesses in said tongues registerable
with said aperture portions and said circumferential
recesses in said grooves
j. and means for retaining said block into said recess
comprising
1». locking pins registering with said apertured portions
1
and said circumferential recesses in said tongues and
grooves and located wholly within said circumferen
tial surfaces of said cutter support.
References Cited in the ?le of this patent
UNITED STATES PATENTS
688,945
2,036,111
2,587,065
2,700,189
2,899,187
2,955,810‘
1901
1936
1952
1955
Biedess ______________ __ Aug. 17, 1959
McWhorter __________ __ Oct. 11, 1960
703,657
Great Britain ________ .... Feb. 10, 1954
generally conforming to the arc of rotation of said 65
support,
De Grave ____________ __ Dec. 17,
Wilson ______________ __ Mar. 31,
Robbins ____________ __ Feb. 26,
Mick ________________ __ Jan. 25,
FOREIGN PATENTS
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