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Патент USA US2137215

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I Nov. 15, 1938.
2,137,215
F. L. FULKE
vMETHOD OF MAKING MINING MACHINE CHAIN CUTTER BITS 4
, Original Filed May 22, 1930
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"Nov. 15, 1938.}
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2,137,215
METHOD OF MAKING'MINING MACHINE CHAIN CUTTER BITS
Original Filed May 22, 1930
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Patented Nov. 15, 1938
2,137,215
PATENT OFFICE
’ UNITED r STATES
2,137,215.
METHOD OF MAKING MINING MACHINE
CHAIN CUTTER BITS
Frank L. Fulke, Terre Haute, Ind., assignor to The
Jeffrey Manufacturing Company, Columbus,
Ohio, a corporation of Ohio
'
Original application May '22,, 1930, Serial No.
454,561, now Patent No. 2,036,327, dated April
7, 1936. Divided and this application October
19, 1934, Serial No. 749,104
8 Claims. (01. 76-108) ,
My invention relates to improvements in min
ing machine chains and more particularly to the
bit carrying links of said chains, and to cutting
bits for mining machine chains.
It is one of the objects of my invention to pro
vide an improved form of bit carrying link, and
bit therefor, which link will permit of a Wide
variation in the adjustment of the bit carried
thereby, so that only-one form of link need be
provided.
It is a further object of my'invention‘ to pro
vide a bit, which while being preferably ap
plicable for use in connection with my particu
lar form of link may also be applicable for use
>with the standard commercial form of link now
in use and which may be cheaply manufactured.
It is another object of my invention to provide
a bit having a plurality of cutting points each of
which, by a simple adjustment of the bit holder
may be presented in cutting position.‘
It is a further object of my invention to pro-‘
vide a‘ cutter bit which has sharpened‘ flaring
cutting edges ‘adjacent the points of the bit so
that, in the event that the point of the bit does
25 . not remove the‘ material to be cut, the edges will
come into cutting operation.
30 terial in multiple grouping without waste of ma
terial and to provide a bit with a minimum
weight of material per point.
Other‘ objects of the invention will appear
hereinafter, the novel features and combina
35 tions being set forth'in the appended claims.
For the purpose of disclosing my invention 1'
'have illustrated certain embodiments thereof in
the accompanying drawings in which
Fig. 1 is a side elevation of a cutter chain em
40 bodying my improved form of bit link and show
ing my improved form of bit supported therein;
Fig. 2 is a front elevation of the chain, the
chain guide being shown in section, and show
ing the bits of the successive links in various ad
45 ‘ justed positions;
Fig. ‘3 is a detailed sectional view showing the
bit clamping means of the bit link illustrated in
~
7
Fig. 8 is a side elevation of one embodiment of
my bit;
'
i
»
r
.
Fig. 9 is a front elevation thereof;
Fig. 10 is a rear elevation thereof;
Figs. 11 and 12 are respectively front and
sectional views of, a modi?ed form of my bit;
Fig‘. 13 is still another modified form of my
bit;
Fig. 14 is a front elevation of a further modi
?ed form of my bit;
-
Fig. 15 is a plan view of a layout on a metal
sheet showing how my improved form of bit may
be stamped and drop forged from sheet metal;
Fig. 16 is a side elevation partially in section
of the ordinary commercial form of bit link
showing ‘means for clamping my improved bit in
position;
'
Fig. 1'7 is a modi?ed form of link and clamping
means;
'
i
Fig. 18 is a detailed section on the line 18-48
of Fig. 16; and
'
_
Fig. 19 is a detailed section on the line I9—_l9
of Fig. 17.
.
v
_
,
25
The present application is a division of my
‘It is a further object of my invention to pro
vide a bit which geometrically renders itself to
drop forging or stamping from sheets of ma
Fig. 1;
Fig. 7 is a front elevation of the rear bit
clamping member;
‘
Fig. 4 is a detailed sectional view showing the
~50 bit clamping positioning means;
Fig. 5 is a sectional view .of the bit link show
ing the oiling means;
Fig. 6 ‘is a front elevation of the front bit
clamping member of the type illustrated in
55' Fig- 1;
co-pending application Serial No. 454,561, ?led
May 22, 1930, now Patent ‘Number 2,036,327,
dated 'April 7, 1936, for an Improvement in min
ing chain cutting bits.
30
In the embodiment illustrated in Figs. 1 to 7,
the bit carrying link I is provided with a bit
carrying head 2, which is preferably cylindrical
in shape and is laterally offset as illustrated in
Fig. 5. This head is arranged intermediate of
the ends of the'link I, being formed integrally
therewith, and the two faces are identical so that
theposition of the link may be reversed. Under
such circumstances, however, of course, the head
will be thrown on the opposite side of the line of 40
travel. The links I are connected together by
connecting links 3 which are of the usual forma
tion and to provide for such connection each of
the bit carrying links is provided with pivot pin
openings 4 extending therethrough and into
which the connecting pins are adapted to pass.
These openings are lined with hardened bush
ings 5.
' For insuring the lubrication of the pivoted
connections I provide each link with a centrally
disposed well 6, preferably formed in the link at
the time the same is drop forged, and having its
front closed by a closure plate 1. Recesses 8 are
formed in the side walls of the well 6 which com
municate with the pivot openings 4 so that the 55
2
2,137,215
lubrication contained in the well will flow to the
pivot points.
For preventing the bushings 5
from rotating, each bushing is provided with a
slot 9 into which takes the end of a locking bar
I0 arranged in the well 6 and extending through
the recesses 8. Any suitable ?tting as Il may be
r
the triangles 30 while the clamping face 16 re—
calves and backs up the rear face of the triangle.
If desired the bit may be of the structure shown
in Figs. 11 and 12 wherein the front face is
perfectly ?at and is! provided with a central
opening 32 to receive a securing pin. The rear
provided in a counter-sunk recess I2 in the top face has the same con?guration as the rear face
of the link I whereby the lubrication may be fed ‘ of the structure shown in Figs. 8 and 9 and is
provided with a rearwardly extending lug 32' to
to the well.
The o?‘set head 2 is centrally bored at l3 to take into a recess on a back clamp.
10
In the structure illustrated in Fig. 13 a cen
receive the bolt M by which the clamping mem
bers for the bit are secured in position. The tral opening 33 is provided by which a clamping
rear clamping member I5 has its top front face pin on the front clamp may be projected through
a bit if desired. In the structure illustrated in
rearwardly and upwardly inclined as at I6, be
ing ?at, and its outer edges surrounded by a lip Fig. 14 the bit is substantially the same con?gu
II. This face is substantially triangular in shape ration as that illustrated in Figs. 8 and 9 except
and by the projection of the flanges I‘! a ?at that the points 34 are rounded.
In Fig. 15 I have illustrated a sheet of ma
bottom triangular recess is provided. The re
maining portion of the clamping member is terial from which the bits illustrated in Figs. 8
and 9 may be formed by drop forging, stamping, 20
rolling or otherwise. And it will be noted from
The front clamping member I 8 coincides in the layoutof the stampings on the sheet that the
shape to ‘the rear clamping member l5 and is bits may be formed with a‘minimum of waste of
provided with a forwardly and upwardly inclined material.
Drop forging, stamping, rolling, and hand op 25
25 clamping face [9 which coincides with and lies
erations for shaping metal, are of course well
parallel to the face l6 of the rear clamping mem
ber. The bottom edge of this clamping member known, but my invention is not broadly directed
is provided with a lug 20 which rests against the to drop forging, stamping, rolling, or hand oper~~
ations, but is the adaptation of these well known
front faceof the clamping member IE to com
pensate for the thickness of the bit to be clamped methods of shaping sheet metal, to the particu 30
lar and speci?c purpose of forming mining ma
between the two- members. Each of the clamp
ing members is provided with a central opening chine cutter bits. That is to say, those acquainted
to receive the bolt I4 and the opening of the with such well known methods of shaping sheet
front clamping member is internally‘ screw metal will be able to understand how to carry
out my improved methods to efficiently produce
threaded to receive the screw threads 2| of the
mining machine cutter bits from strips of sheet
bolt I4. The rear clamping member I5 is main
tained against longitudinal displacement on the metal.
My improved method contemplates the mak
bolt. M by means of a set screw 22, the end of
ing of mining machine cutter bits having a plu
which takes into an annular groove 23 in the
rality of cutting points which comprises the 401
4.0 bolt. This arrangement permits of the move
formation in a sheet of metal of a plurality of
ment of the front clamping member by the rota
tion of the bolt relatively to the rear clamping recesses having a plurality of triangular opposing
member. Both clamping members are rotatable faces, and dividing the sheet metal at the edges
on the bolt id, to adjust their clamping faces, of the recesses to form a plurality of cutter bit
. and with them, the bit to various positions, and points radially disposed relative to the center of 45.
for maintaining the clamping members in their each blank. My improved method of making
various adjusted positions, I provide a pin 24 such mining machine cutter bits comprises the
which takes into apertures 25 and 26 in the front formation from a sheet of metal of cutter bit
20
preferably
cylindrical to
cylindrical head 2.
coincide
_
with
the
‘
and rear clamping members and into recesses 21
It will be noted that
I provide a plurality of these recesses 21 whereby
the bit may be adjusted on the head 2 to obtain
50 in the face of the head 2.
the most bene?cial cutting position for that par
ticular link, and it will be noted from Fig. 2'
55 that by adjusting the successive bits in the chain
blanks by recessing adjacent equilateral triangles
of the sheet metal, and dividing the sheet metal 50
at the edges of the equilateral triangles to form
cutter bits with radially disposed cutting points
connected by cutting edges. In forming such
cutter bits from sheet metal, a strip of material
may be provided having a width equal to twice
It will also be
the width of a single bit measured from one point
noted that by merely reversing the link, thereby
perpendicularly to the opposite side, and form
ing in such strip of metal triangular recesses with
a proper kerf may be obtained.
throwing the head 2 to the opposite side of the
line of travel, the width of the kerf may be ad
60 justed as desired.
The bit which I provide, used in connection
with the above described link has a plurality of
cutting points and in the structure illustrated,
having particular reference to Figs. 8, 9 and 10 is
65 provided with three cutting points 28 connected
by sharp cutting edges 29 which outline an equi
lateral triangle. The face or cutting side of the
bit is concaved and the back of the bit is con
vexed so that the bitforms a triangular con
70 cave-convex ?gure, the front faces 30 and the
rear faces 3| of which form three isosceles tri
angles.
~
In clamping the bit in position it will be note
that the clamping face l9 engages in the front
75 face of the bit and lies flat and against one of
their edges merging so as to use nearly all the
metal in the strip, and ?nally severing the re—
cessed portions along such edges in equilateral
triangular formation.
An integral piece of material may be provided
of predetermined size and area, recesses in such
material drop forge-d in multiple group forma 65
tion, without waste of material, separating the
blanks from the group» and providing each blank
with a plurality of cutting points. That is to
say, cutter bits are formed by drop forging re
cesses in a sheet of metal to predetermine a
plurality of closely adjacent blanks, and stamp
ing the blanks from the sheet for forming bits
each having a plurality of cutting points. By
thus drop forging and stamping from a sheet of
material, recessed cutter bits may be produced,
2,137,215
each having-a plurality; of ‘cutting points con
nected by equilateral edges. The cutter bits may
be triangular in shape,‘ each having a plurality‘
of cutting points and equilateral sides.
Preferably, a rectangular strip of sheet metal
such as that shown ‘in Fig. '15,‘ is employed. Such
rectangular strip has anlareaproportional to the
3
as at 48 so that, when‘ the clamp as a whole
is lifted slightly out of its'socket 35, the two
clamping members may be separated, and to pre—
vent their complete withdrawal I provide a shoul- _
der 49 on the lower end of the front shank which
will be. engaged .by the edge. of the set screw
unless the same is withdrawn to a greater extent,
size of each cutter bit. .The'strip may berecessed . and prevent the complete removal of the clamp
in multiple group formation as. illustrated in Fig.
15, this being in accordance with thepredeter
mined size of thecutter bit. . The recessed areas
areseparated along the lines indicated in ‘Fig.
15, to form a plurality of. recessed cutter vbits
each having a plurality ‘of cutting points whereby
15' nearly. all offthema‘terial in said strip is used in
said cutter bits.
As above stated, drop forging, stamping, roll
ing, and hand operations, for the shaping of
sheet metal, are old and well known.
These in
20 volve machines and tools which I do not claim
to have improved. My improvement contem
plates the use of old tools heretofore used for the
shaping of metal, but adapting the use of such
tools to a new method because the steps em
25 ployed give such a shape to the metal as to pro
duce a new article of manufacture, namely, a
mining machine cutter bit.
For instance, I may, by means of manually
operated punches and dies, form the recesses in
30 the strip of metal of Fig. 15, one after another,
and then shear the blanks apart to form the
cutter bits. Or I may drop forge the recesses,
one after another, and cut the recessed blanks
apart to form the cutter bits. 01' I may stamp
out from the strip a triangular cutter bit by
recessing and cutting by means of well known
machinery modi?ed to produce the desired shape
to secure the three-pointed recessed sheet metal
bit.
40
'
While I resort to well known machinery and
old methods of shaping metal, these are modi
?ed and associated in new combinations to pro
ing member. In order to force the clamping
member upwardlyNfo-r the purpose of renewing 10"
or changing the bit I provide a spring 50 in the
bottom of the socket 35.
~
.
'
In .the structure .illustrated'in Fig. 1'7 I show
a modi?ed form of link which may be reversed.’
Inthis form: ‘of’link the socket is-rounded and‘ the 15
head is screw threaded as at 5| and 5|’ to re
ceive, from either end, the holding screw 52. The
shanks of the front and rear clamp-ing members
53 and 54 are rounded and the shank of the
front clamping member 53 is' provided with a 20
conical recess 55 for reception of the conical end
of the set screw 52, whereby when the screw is
turned up it will not only force the' two clamping
members together but will tend to draw the mem
ber 53 down onto the member 54.
25
Obviously those skilled in the art may make
various changes in the details and arrangement
of parts without departing from the spirit and
scope of the invention as de?ned by the claims
hereto appended, and I therefore wish not to be 30
restricted to the precise construction herein dis
closed.
Having thus described and shown an embodi
ment of my invention, what I desire to secure by
Letters Patent of the United States is:
35
1. The method of making mining machine
cutter bits having a plurality of cutting points
which comprises the formation in a sheet of
metal of a plurality of recesses having a plu
rality of triangular opposing faces, and dividing 40
the sheet metal at the edges of the recesses to
form a plurality of cutter bit blanks of equal size
duce a new and useful result in that a triangular
and shape to afford a plurality of cutting bit
three-pointed cutter bit is very efficiently pro . points equal in number to said plurality of op
45 duced from a sheet of metal. In. other words,
posing faces and radially disposed relative to the 45
my steps are carried out to a further extent than center of each blank.
a mere shaping of a piece of metal into a blank
2. The method of making mining machine
having no utility. My improvements include the cutter bits which comprises formation from a
further association of the various steps and their sheet of metal of cutter bit blanks by recessing
50 continuance until the blank is in shape to act as
adjacent equilateral triangles of the sheet metal,
a cutter bit for mining machines.
v
In Fig. 16 I have illustrated a form of clamp
ing member which may be used on the present
commercial type of bit link. This bit link as
55 illustrated is provided with a longitudinally ex—
tending opening 35 generally rectangular in cross
section as is the character of bit now in commer
cial use. The bit is secured in position by means
of a set screw 36. My present type of clamping
means comprises a. rear clamping member hav
ing a shank 31 provided with a head 38 over
hanging and resting upon the top of the link as
at 39. This head has a rearwardly and upwardly
inclined triangular face 49 surrounded by a rim
65 4!. Cooperating with the rear clamping mem
ber is a front clamping member having a shank
42 provided with a lug 43 taking into a recess
44 on the front face of the shank 31 and provided
with a head 45 overhanging and. resting upon, as
70 at 46, the top of the link. This head has a front
face 47 slightly forwardly extending to cooperate
with the face 40 for clamping the bit between
the same.
.
The lower ends of the two shanks at their ad
75 jacent faces are inclined away from one another
and dividing the sheet metal at the edges of the
equi-lateral triangles to form cutter bits having
50
radially disposed cutting points connected by
cutting edges.
3. The method of forming cutter bits from 55
sheet metal which consists in providing a strip
of metal having a width equal to twice the width
of a single bit measured from one point per
pendicularly to- the opposite vside, forming tri
angular recesses with their edges merging so as 60
to use all of the metal in the strip and severing
the recessed portions along such edges in equi
lateral triangular formation.
4. The method of forming cutter bits from an
integral piece of material which consists in pro 65
viding such material of predetermined size and
area, drop forging ?at faced recesses in such
material in multiple group formation without
waste of material, and separating the individual
blanks from the group to provide each blank with 70.
a plurality of cutting points equal in number to
the ?at faces of the recess therein.
5. The method of forming cutter bits which
consists in drop forging and stamping from a
sheet of metal triangular cutter bits each of the 75
4
2,137,215
same size and each having a plurality of cutting
chain cutter with any one of the cutting points
points and equilateral sides in planes having lines
of intersection extending through said points.
'6. The method of forming cutter bits which
in cutting position.
'
8. The method of forming a plurality of cutter
bits from a ?at sheet of metal with minimum
waste of material, which consists in forming re
consists in drop forging and stamping from a
sheet of metal, triangular cutter bits each of the ‘ cesses in each of a series of closely adjacent tri
same size and each having three ?at equilateral angular areas to form triangular ?at faces in
faces on the inner side and three on the outer
intersecting planes, cutting the metal apart along
side.
7. The method of forming a cutter bit from a
10'
?at sheet of metal which consists in shaping and
recessing the metal to form three cutting points
lines bounding such areas to afford cutter bits
equilaterally spaced and connected by equilateral
seating faces in intersecting planes to adapt the
15 cutting bit for clamping to a‘ mining machine
ing link of a chain cutter with any one of the
each having three cutting points from each'of 10
which diverge two ?at inner faces and two flat
outer faces adapted to be clamped to a bit hold
cutting points in cutting position.
FRANK L. FULKE.
15
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