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NOV. 19, 1946.
L, E_ SIMMONS ~
2,411,170
KERF CUTTING DEVICE
Filed April 20, 1945
2 Sheets—Sheet 1
5'
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NOV. 19, 1946.
L. E_ $|MMQN$
2,411,170
KERF CUTTING DEVICE
Filed April 20, 1945
2 Sheets-Sheet 2
Patented Nov. 19, 1946
2,411,170
UNITED STATES PATENT OFFICE
2,411,170
’
KERF CUTTING DEVICE
Leon E. Simmons, Claremont, N. H., assignor to
Joy Manufacturing Company, a corporation of
Pennsylvania
Application April 20, 1943, Serial No. ‘483,748
3 Claims.
1
This invention relates to kerf cutting devices
and more particularly to an'improved cutter bit,
bit mounting means and a chain block and strap
link structure for a cutter chain of a coal cutting
machine.
An object of the present invention is to provide
an improved kerf cutting device. Another object
is to provide an improved cutter chain for a coal
cutting machine. A further object is to provide
(Cl. “262-433)
2
Fig. 12 is a sectional view similar to Fig. 3 il
lustrating another form of the invention.
Fig. 13 is a front end elevational view of the
structure shown in Fig. 12.
Fig. lli is a side elevational view, partially in
section, of the bit holder shown in Fig. 12.
Fig. 15 is a rear elevational view of the bit
holder shown in Fig. 14.
Fig. 16 is a front elevational view of the bit
an improved bit mounting for a cutter chain.
holder shown in Fig. 14.
Still another object is to provide an improved
cutter bit. A still further object is to provide an
improved chain block having a novel socket ar
rangement for the bit mounting parts. Yet an
Fig. 17 is a side elevational View, partially in
section, of the front clamp shown in Fig. 12.
other object is to provide an improved chain
Fig. 13 is a rear elevational View of the front
clamp.
Fig. 19 is a front elevational view of the cutter '
block having relatively inclined, inwardly diverg
bit shown in Fig. 12. ‘
ing, front and rear sockets, one for receiving a
bit holder and the other for receiving a front bit
clamp. Still another object is to provide an im
proved mounting arrangement for the holder
parts of a bit mounting means. Another object
is to provide a novel chain block and strap link
structure for a cutter chain. A further object is
29—20 of Fig. 19.
Fig, 21 is a sectional View similar to Figs. 3 and
12, illustrating still another form of the inven
tion.
Fig. 22 is a perspective view of the bit holder
to provide an improved strap link and hinge pin
Fig. 23 is a perspective view of the front clamp
locking means. These and other objects and ad
vantages of the invention will, however, herein
after more fully appear.
In the accompanying drawings there are shown
for purposes of illustration three forms which the
invention may assume in practice.
In these drawings:
Fig. 20 is a cross sectional view taken on line
shown in Fig. 21.
shown in Fig. 21.
‘
'
Fig. 24 is a perspective View of the cutter bit
shown in Fig. 21.
,
In the illustrative embodiment of the invention
shown in Figs. 1 to 11 inclusive, there is a cutter
chain comprising a chain block I connected by
hinge pins 2 to strap links 3.
The strap links .
Fig. l is a side elevational View of a cutter
chain constructed in accordance with a pre
have lateral gibs i received in the guideways 5
ferred illustrative embodiment of the invention.
block has lateral ledges ‘lv at its opposite sides
Fig. 2 is a cross sectional view taken substan
tially on line 2—2 of Fig. 1.
Fig. 3 is a view in longitudinal vertical section
which overlie the outer sides of the strap links 3
in the manner shown in Fig. 2, to hold the strap
links against lateral release in a manner to be
later explained The hinge pins 2 extend be
tween guide strips 8 suitably ?xed to the outer
of a cutter bar 5 as shown in Fig. '2. The chain
taken substantially on line 3—-3 of Fig. 2.
Fig. 4 is a horizontal sectional View taken sub
410 bar plates ii of the cutter bar. The hinge pins
stantially on line 4-4 of Fig. 3.
are locked against rotation relative to the chain
Fig. 5 is a side elevational view, partially in
block by keys l9 seated in longitudinal. key slots
section, of the improved bit holder.
Fig. ‘6 is a top plan view of the bit holder shown
formed respectively in the‘pins and block. ‘The
in Fig. 5.
‘
.
keys it are arranged between, and at their ends
Fig. 7 is a perspective View of the front bit 45 abut, the inner surfaces of the strap links. When
clamp.
.
the strap links are turned through substantially
Fig. 8 is a perspective View looking toward the
90° into the position shown in Fig. 10, slots II in
front cutting face, of the improved cutter bit.
the links are brought into registry with the keys
Fig. 9 is a cross sectional view taken substan
Hl so that the latter may be driven out, thereby
50
tially on line 8——9 of Fig. 8.
to enable removal of the hinge pins. “When the‘
Fig. 10 is a fragmentary view in side elevation
hinge pins are removed the strap links may be
illustrating a portion of the strap link and hinge
readily moved out of their interlocking relation
pin lock.
with the ledges ‘l on the chain block. Of course,
Fig. 11 is a detail sectional view taken substan
the chain must be moved out of the guideways
tially on line H—l l'of Fig. 10‘.
l
2,411,170
3
of the cutter bar, before removal of the pins
and their keys.
The chain block has a lateral lug l2 formed with
4
ceived in the front lug bore 35 is a cylindric shank
51 of a front bit clamp 52, and a rearwardly fac~
relatively inclined, inwardly diverging front and
ing surface 53 on the clamp is shaped to conform
with the curved central portion 54 of the forward
rear sockets in the form of bores 13 and [4 which
converge near the outer surface of the block lug,
side of the bit as shown in Fig. 12. The rear side
the point of juncture of the bores being indicated
at 15. .These bores are circular in cross section
and at their inner ends are spaced a substantial
of the shank 5| of the front clamp is vertically
grooved at 55 to receive the inner inactive cutting
portion of the cutter bit. When the cutter bit is
held in cutting position between the holder and
distance apart longitudinally of the chain block 10 the front clamp, the inactive cutting portion
thereof extends into the front bore 35 of the
block .lug. A set screw 56 is threaded within an
inwardly inclined opening 5? in the block lug in
cylindric shank l9 adapted for reception in and
advance of the front bore 35, and this screw has
?tting the rear block bore it. The forward side
a conical or tapered end portion 58 engaging a
of the holder head I? is vertically slotted at 2@.
bottom inclined surface 59 at the inner end of the
A cutter bit, generally designated 2|, is shown as
clamp shank. When the set screw 56 is tightened,
of the reversible, double pointed type having a
the tapered portion 58 thereof acts on the inclined
front plane cutting face 22 of generally elliptical
clamp surface 59 to move the front clamp out
shape terminating in cutting points 23, 23 at the
wardly and rearwardly in the front lug bore
opposite ends of the bit body. The bit body is
rmly to clamp the cutter bit against the holder .
preferably of generally T-shape in cross section,
head.
_
as shown in Fig. 9, throughout a substantial por~
In the embodiment shown in Figs. 21 to 24 in
tion of its length, and the leg of the T is formed
clusive, the block and strap link structure is simi
by a narrow ?ange 2d at the back of the bit, and
lar to that of the preferred embodiment. In this
the rear side of the bit body is arcuately formed
instance, a chain‘block lug E!) has relatively in
at 25. The ?ange at the back of the bit is received
clined, inwardly diverging bores 6i and 52. Re—
in the holder head slot 20, and the front cutting
ceived in the rear lug bore is a cylindric shank
as shown in Fig. 3. A bit holder it; has a head I?
adapted to rest at E8 on the outer surface of the
block lug, and integral with the holder head is a
face of the bit rests against an inclined rear
63 of a holder $4, the latter having a recess ‘65
wardly facing surface 26 formed at the bottom of 30 opening through its forward side and an inner
vertical groove 2‘! on an adjustable front clamp
abutment surface 66 at the bottom of the recess.
28. This clamp has a cylindric shank portion 25
adapted ‘for reception and ?tting the front block
bore 13. The inner inactive cutting portion of the
cutter bit projects into the rear lug bore M in the
manner shown. A set screw 36 is threaded within
aninwardly inclined opening 3! in the front part
of the block ing in advance of the front bore l3,
and this screw has a tapered or conically shaped
A cutter bit, generallydesignated 6?, has a body
of generally trapezoidal shape in side elevation
and preferablyof diamond shape in cross section.
The .bit body is formed with relatively inclined,
inwardly diverging cutting faces @ii, 58 terminat
ing in cutting points 69 at the opposite extremities
of the bit at the same side of the bit body. The
inner portion of the cutter bit is received in the
inner portion 32 engaging an inclined bottom 40 holder socket 55 with the inner inactive cutting
surface 33 at the inner end of the front clamp
face of the bit resting against the abutment sur~
shank. When the set screw 38 is tightened, the
face 66. The inner inactive end of the cutter bit ‘
tapered portion thereof engages the inclined
projects within the rear lug bore 62 in the manner
clamp surface 33 for moving the clamp outwardly
shown. A cylindric front clamp it is received
and rearwardly in the front lug bore into ?rm
in the front lug bore of and has a rearwardly
clamping engagement with the front face 22 of
facing surface ‘H against which the inner parallel
the cutter bit to hold the latter against the holder.
side of the bit body rests.‘ The front clamp also
When the front clamp is in bit clamping position,
is provided with a relatively inclined rearwardly
it projects in part into the rear lug bore M.
facing abutment surface 72 with which the inner
In the embodiment shown in Figs. 12 to 20 in- _.> portion of the active cutting face of the bit en
clusive, the chain block and strap link structure
gages. A set screw 13 is threaded Within a lon
is similar to that above described. The relatively
gitudinal opening 14 in, the block lug at the for
inclined, inwardly diverging lug bores 35 and 35
ward side of the front lug bore .65,
this screw
in the block have an abutment surface 31 extend
has a rounded end ‘5'5 engaging an inclined inner
ing therebetween near the juncture of the bores
surface '56 on the front clamp ‘iii. When the set
as shown in Fig. 12. A bit holder 38 has a head
screw 73 is tightened, the front clamp is moved
39 and a cylindric shank t6, and the head has an
outwardly and rearwardly in the front lug bore
inwardly located abutment M at the forward side
?rmly to clamp the cutter bit in the holder socket.’
of the holder shank. In this instance, the holder
In the several forms of the invention above de
head does not rest on the exterior of the block
scribed the cutter bit, when one cutting point
lug, and the head surface 4! seats against the
becomes dull, may be removed from the holder
abutment surface 3? intermediate the lug bores.
simply by loosening the front clamp and turned
A cutter bit, generally designated 42, of generally
end for end to present, upon reinsertion in the
arcuate shape in side elevation, has relatively in
holder, a sharp cutting point to the Work, Also
clined cutting portions d3, d3 terminating in cut
the block lug is symmetrically formed and is pro
ting points M at the opposite extremities of the
vided With a rear set screw opening so that the
bit body. The bit body is substantially T-shape
parts may be reversed on the block to hold the.
in cross section as shown in Fig. 20, and the leg
cutter bit in the reversed position, thereby to
of the T is provided by anarrow ?ange 45 at the
provide a reversible cutter chain. This sym
‘back of the bit. The side ledges £6, 45 at the head
' metrical arrangement, providing for arreversible
of the T arecurved inwardly at 41 toward the cut
chain, is unnecessaryfor the obtaining of many
ting points 44 as shown in Fig. 19. The back edge
of the advantages of vmy invention from certain
of the ?ange 45 is curved at 48 and ?ts against
of its aspects. The holder and clamp structure
the curved bottom surface 49 of a vertical slot 5%}
.and the novel arrangement of'the block lug bores,
inthe ‘forward side of the holder head 39, Re
afford an extremely, simple bit mounting for
2,411,170
v6
5
a common plane and diverging downwardly at an
?rmly securing a cutter bit in cut-ting position on
the chain block. This structure is not only sim
ple in design, but it is also rugged and durable
and extremely compact. The novel strap link
and hinge pin lock of the preferred embodiment
and having their axes'lying in the central longi
tudinal median plane of said block, bit mount
of the invention provides an effective means for
ing means associated with said block including
acute angle with each other, said bores being sym
metrically arranged with respect to said block
relatively adjustable bit supporting and holding
elements received in said bores respectively, said
supporting and holding means being interchange
holding the hinge pins against rotation relative
to the block, thereby concentrating wear on the
relatively inexpensive strap links. Also the strap
links are e?ectually interlocked with the chain 10 able in said bores whereby a cutter bit may be
mounted selectively in reverse positions to cut
block. Other advantages of the invention will
in either of opposite directions, and means for
be clearly apparent to those skilled in the art.
e?ecting relative adjustment between said ele
While there are in this application speci?cally
ments and for securing said elements in position
described three forms which the invention may
assume in practice, it will be understood that 15 in said bores.
3. In a cutter chain, a chain block having a
these forms of the same are shown for purposes
lateral lug, said lug having ‘relatively inclined,
of illustration and that the invention may be
front and rear bores arranged with their axes in
modi?ed and embodied in various other forms
a common plane and diverging downwardly at an
Without departing from its spirit or the scope of
the appended claims.
20
What I claim as new and desire to secure by
Letters Patent is:
v
1. In a cutter chain, a chain block having a
lateral lug, said lug having relatively inclined,
acute angle with each other, said bores. being so
arranged that they merge together at their outer
portions and there being provided a transverse
abutment surface, at an angle to the adjacent
walls of each of said bores, between said bores
front and rear bores arranged with their axes 25 near their juncture, bit mounting means asso
ciated with said block including relatively ad
in a common plane and diverging downwardly at
an acute angle with each other, said bores being
so arranged that they merge together at their
justable supporting and holding elements each
outer portions and there being provided a trans
held in cutting position between said supporting
verse abutment surface, at an angle to the adja
cent walls of each of said bores, between said
bores near their juncture, bit mounting means
associated with said block including relatively ad
justable supporting and holding elements received ‘
in said bores respectively, and meansv for ef 35
fecting relative adjustment between said elements
and for securing said elements in position in said
receivable in either one of said bores, a cutter bit
and holding elements in said bores and facing in
one direction or the other dependent upon the
assembly of said elements in said bores and hav
ing ‘its inner end projecting inwardly to a posi
tion in which at least the extremity of such end
lies solely in one of said bores, and means for
effecting relative adjustment between said ele
ments to effect bit clamping and the securing of
said elements in position in said bores, one of said
elements having an inner abutment surface rest
ment surface when said elements are secured in 40 ing against said transverse abutment surface
when said elements are secured in bit holding
bit holding position.
position in either assembled position thereof in
2. In a cutter chain, a chain block having a
said bores.
lateral lug, said lug having relatively inclined,
LEON E. SIMMONS.
front and rear bores arranged with their axes in
bores, one of said elements having an inner abut
ment surface resting against said transverse abut
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