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Patented Oct. 1, 1946
2,408,475
U'NlTED STATES „PATEN 'r _OFFICE
' ’ 27,468,476
CUTTER CHAIN
v
Charles F. Osgood,` Claremont, N. H., assigner to>
Joy Manufacturing Qoçmpany, a corporation of
Pennsylvania
1
Application March 23, 1942, >serial No. 435,805
7 Claims. (ci. 2762-33)
. This invention relates to cutter chains and
more particularly to improvements in holders for
cutter bits especially designed for use with the
.cutter chain of a coal mining machine.
„
In mining machine cutter chains, it is a Well .,
known practice to provide a bit holder having
a shank received in the right angle socket of a
are set forth, reference for the purpose being
hadv to theaccompanying drawing, in which:
Fig. 1 is a fragmentary side elevational View of
a cutter chain havinga preferred illustrative form
of the improved bit holding means associated
therewith.
`
l
Fig. 2 is a front end elevational view of the
conventional chain block, and secured in position
cutter chain shown in Fig. 1, With the strapslinks
on the block by a conventional set screw. With
in> cross section.
many such holders the set screw not only serves -10
Fig. v3 is a fragmentary viewin longitudinal
tc secure the holder shank in the block Socket,
vertical section taken substantially on line 3-3
„but also to secure the cutter bit on the holder.
of Fig. 2.
» Y
.
With such a construction, in the event the set
.Fig..4 is a detail sectional view taken on line
.screw becomes loose during Vthe cutting oper
@-4 of Fig. 3.
.
ation, the cutter bit is not only released from the
Y Fig, 5 is a perspective view of the cutter bit.
Aholder but also the holder is released from the '
Fig. G is ar’perspective view of the improved
block.
`
`
.
bit
clamp.
~
’
.
.
i
it is the purpose oi the present invention to
_provide a novel bit holding means wherein the
Fig. 7 is a perspective view of the bit holder.
Fig. 8 is .a fragmentary sectional View taken on
. rins for securing the holder on the Vchain _block 20 the planel of. Fig. 3, illustrating a, modiñed :form
separate and distinct from the means for se
of- the invention, parts being shown in full to
curing the cutter bit on the holder. With such
facilitate illustration.
„
an improved construction, it is possible to free
In both illustrative embodiments of the inven
the cutter bit from the holder without disturb
tion, the improved bitholding means is shown
t-he relation of the holder- with respect to>
associated with a chain block cfa conventional
the chain block. This not only enables rapid'
cutter chain. It will be'v evident, however,- that
eas;7 reversal >and replacement of a worn cut
the invention may be associated with cutter
ter bit but also prevents the release of the holder
from the block in the event the securing _means for
thel cutter bit for any reason becomes loose. Fur- ,
ther, in such a novel construction the holder _may
be attached to a chain block of a conventional
cutter chain without any change in thel parts,
and the conventional set screws of the block may
serve to hold the cutter bit and holder in posi
tion. This not only simpliñes the structure of
the holder, but also facilitates the attachment of
lthe holder to the chain block.
chains of other types. ,
`
l
lThe cutter chain disclosed herein comprises
>a chain block I pivotally connected at 2 -to strap
links 3. The- chain block has a lateral lug 4
formed witha conventional right .angle socket 5
oi generally rectangular cross section. The chain
block lug t has .front and rear threaded open
ings 6, t for the reception of vconventional set
screws l, l respectively.
In the prefered illustrative embodiment of the
invention shown in Figs. 1 to 7 inclusive, the im
l An object of the present invention is to provide
proved bit holding means comprises a holder S
`a novel cutter chain. Another object is, to provide 40 having a head Sand an integral shank Iii, the
improved cutter bit holding meansfor a cut
latter receivable in the chain block socket 5. The
chain. Yet another object is to provide im
holder head has a plane inner surface il which
proved means for securing a cutter bit to the
holder. A further object is to provide novel means
rests on the outer surface I2 of the chain block
lug
The holder head is formed with an ob
for attaching a conventional cutter bit to the
chain block of a conventional cutter chain. A
still further object is to provide an improved cut
ter bit holding means wherein the means for se
liquely disposed bit receiving socket I3 for the
reception ofacutt'er bit i4. The cutter bit, which
curing the cutter bit to the holder is separate
"and distinct from the means for securing the
holder to the chain block. How these and other
obâects are accomplished, and the advantageous
holder head is shaped to conform to the shape
of the cutter bit._.`The, cutter bit has oppositely
is oi a conventionaldesign, is- generally diamond
shaped in cross section and the socket I3 in the
disposed, relatively inclined, elongated plane cut
ting faces i5, i5 lying in the sides of a triangle
features of the invention, will be best understood
and terminating rin cutting points I6, i6 atthe
'from the following detailed description wherein
opposite extremities of the bit. In this construc
>preferred and modiñed illustrative embodiments 55 tion, secured within the holder head 9 and trav
2,408,476
4
clamp I8 by means of the rear set screw 1 for
wardly relative to the holder and chain block so
as to release the surface 24 of the front bit
stop I1 from engagement with the cutter bit.
received in the front set screw opening 6 in the
chain block lug, is adjustable to engage the shank 6 When the front bit stop I1 is in its foremost re
ersing the blt receiving socket I3 is an abutment
pin I6' against which the inner inactive cutting
face I5 of the cutter bit rests. The set screw 1,
IE! of the holder for securing the holder in posi
tion on the chain block with the surface I I on the
leased position, the cutter bit may be withdrawn
forwardly from the holder head socket I3 with
out disturbing the relation of the holder with
holder head resting against the exterior surface
respect to the chain block. It is accordingly evi
I2 of the chain block lug. Engaging the inner
portion of the active front cutting face I5 of the 10 dent that even if the rear set screw 1 becomes
slightly loosened so that the clamp is free to
cutter bit is a front stop I1 of an adjustable
move forwardly to permit bit release, the holder
clamp I8. This clamp has an elongated central
shank I0 will still be firmly held in position within
opening I9 which receives the inner portion of
the socket of the chain block by the front set
the holder head, and the latter has lateral ledges
ZI), 2i) which overlie the sides of the clamp in the 15 screw. Thus the clamp may be released to per
mit reversal or replacement of the cutter bit
manner shown in Fig. 4, so that the clamp strad
quickly and with facility without disturbing the
dles the holder in the manner shown. Thus the
holder at all.
holder maintains the bit clamp in position on
In the modified embodiment of the invention
the block. The clamp has at its rearward end
_a downwardly bent portion 2I which is slotted at 20 shown in Fig. 8, the holder and clamp are oper
22 to engage the annular grove 23 of the rear set
screw 1. The front stop I'I of the clamp has a
rearwardly facing, inclined surface 24 against
which the forward face of the cutter bit rests,
and the active cutting point of the cutter bit 25
projects outwardly and forwardly with respect to
the holder and clamp in the manner shown in
ated in a manner similar to that above described.
In this instance, however, instead _of engaging
the clamp with the rearset screw of the chain
block for adjustment by the same; adjustment of
the clamp is effected by engagement of the set
screw 21 with the projection 28 integral with the
holder head. This construction is particularli7
advantageous when the bit holding means is
Fig. 3.
associated with a cutter chain wherein but one set
In the modified embodiment of the invention
shown in Fig. 8 the clamp I8' has an upwardly 30 screw opening, i. e. the front one, is provided on
the chain block lug. Otherwise, the manner of
bent portion 25 provided with a threaded opening
use of this form of the invention is similar to
2B for the reception of a set screw 21. The holder
that above described.
9' is similar to the holder 8 above described eX
As a result of this invention, it will be noted
cept, in this instance, the rearward portion of
the holder head is formed with a projection 2S 35 that an improved cutter bit holding means is pro
vided whereby a cutter bit may be firmly secured'
against which the set screw 21 is adapted to abut.
in position on a chain block of a conventional
It is accordingly evident that the bit clamp, in
cutter chain. It will further be evident that by
stead of engaging the rear set screw of the chain
the provision of the bit clamp having adjusting
block as in the preferred embodiment of the in
vention, carries a separate set screw which abuts 40 means separate and distinct from the securing
means for the holder, the cutter bit may be re
the rear surface of the holder head for adjusting
leased for reversal or replacement quickly and
the clamp with respect to the holder. Otherwise,
with facility. It will also be evident that by
this form of the invention is similar`to the pre
vthe provision of the bit clamping means separate
ferred embodiment above described.
During assembling of the parts, the holder 45 and distinct from the securing means of the bit
holder, the latter will be firmly held in position
shank IQ is inserted through the opening I9 in the
on the chain block even when the bit securing
bit clamp, and the holder shank is then inserted
means for any reason becomes loose. The bit
within the chain block socket 5 into the position
holder and its associated clamp are also simple
shown in Fig. 3. with the bit clamp engaging the
outer block lug surface. The front set screw 'I is 50 and rugged in design. Other uses and advan
tages of the invention will be clearly apparent to
then adjusted to engage the holder shank ID
those skilled in the art.
firmly to secure the holder on the chain block
While there are in this application specifically
with the inner surface II of the holder head
described preferred and modified embodiments
resting iirmly against the exterior surface I2 of
the chain block lug. The cutter bit may then be 55 which the invention may assume in practice, it
will be understood that these embodiments of the
inserted past the front stop I1 of the then re
same are shown for purposes of illustration and
leased clamp, into the socket I3 of the holder
that the invention may be further modiñed and
head with the inner inactive cutting face I5 of
embodied in various other forms without depart
the cutter bit resting against the abutment pin
I E’. When the cutter bit is in the position shown 60 ing from its spirit or the scope of the appended
in Fig. 3, the rear set screw 'I may be adjusted
claims.
What I claim as new and desire to secure by
to move the clamp I8 rearwardly with respect to
the holder and chain block to bring the surface
Letters Patent is:
1. In a cutter chain, a chain blo-ck having a
24 on the front bit stop I1 in engagement with F
the inner portion of the active cutting face I5 60 socket, a bit holder having a shank receivable
in the socket of said block, a bit clamp cooper
of the cutter bit, thereby to clamp the cutter
ating with said holder and having a longitudi
bit firmly in cutting position on the holder
nally extending portion resting on an outer sur
head. The clamp I3 is held in position between
face .of said block when the clamp is in operative
the ledges 20 on the holder head and the eX
terior surface of the chain block lug, the parts be 70 position, said holder having side portions en»
gaging the sides of the longitudinally extending
ing so formed as to permit free adjustment of
portion of said clamp for holding said clamp
the clamp relative to the holder while preventing
against said block surface and for guiding the
any appreciable amount of looseness. When it
latter during adjustment thereof relative to said
is desired to release the'cutter bit from the holder,
this may be accomplished simply by adjusting the 75 holder and said block in a direction lengthwise
2,408,476
5
6
of said block, means for securing said holder
on said block, means separate from said securing
means for adjusting said bit clamp longitudinally
into bit clamping position relative to said holder
said holder and said block cooperating to pro
vide means extending lengthwise of said block
for guiding said clamp, and said opening being
and said block, and a cutter bit mounted on
said holder and engageable by said bit clamp.
2. The combination with a chain block having
a right angle socket and front and rear set screw
openings for the reception of set screws and hav
elongated in the direction of said guiding means
to permit adjustment of said clamp relative to
said holder.
5. The combination with a chain block having
a socket, of a holder having a head and a shank,
said shank receivable in said block socket, means
ing set screws in said openings, of bit holding 10 carried by said block for securing said holder
means for securing a cutter bit in-cutting posi
shank in said block socket, a bit clamp cooper
tion on said block including a holder having a
ating with said :block and holder, said clamp
having an opening for receiving the inner portion
head and a shank, said shank receivable in said
block socket and the front set screw engageable
of said holder head and the latter engaging said
with said shank for holding the latter in said 15 clamp to hold the same against said block, and
the holder cooperating with said block to provide
socket, and a bit stop-providing member co
operating with said holder and engageable by , a guidevvay for said clamp between said holder
said rear set screw and adjustable by the latter
head and the outer surface of said block, said
into bit securing position relative to said holder
guideway extending lengthwise of said block, and
and said block, said holder and said block pro 20 means separate from said shank securing means
viding guiding means extending lengthwise of
for adjusting said bit clamp along said guideway
said block for guiding said stop-providing mem
into bit clamping position relative to said holder
ber during adjustment thereof.
and said block.
6. -The combination with a chain block having
3. The combination with a chain block having
a right angle socket and front and rear set screw 25 a socket, of a bit holder having a head and a
openings for the reception of set screws and
shank, said shank receivable in said block socket,
having set screws in said openings, of bit hold
means carried by said block for securing said
ing lmeans for securing a cutter bit in cutting
holder shank in said block socket, an adjustable
position on said block including a holder having
bit clamp arranged between and guided vby said
a head and a shank, said shank receivable in said 30 holder and block, said holder head engaging said
block socket and the front set screw engageable
clamp to hold the latter in operative position.
with said shank for holding the latter in said
against the block and said holder and the block
socket, and a bit stop-providing member cooper
cooperating to provide guiding means for the
ating with said holder and engageable by said
clamp extending lengthwise of the block, and
rear set screw and adjustable by the latter into
bit securing position relative to said holder and
means separate from said shank securing means
for adjusting said bit clamp into bit clam-ping
position relative to said holder and said block.
an opening> for receiving said holder head and
'7. The combination with a chain block having
the latter cooperating with said block to pro
a right angle socket and adjustable devices ar
vide a guide for said stop-providing member
ranged on said block respectively forwardly and
during adjustment of the latter, said guide ex
rearwardly of said socket, of bit holding means
tending lengthwise of said block, and said open
for securing a cutter bit in cutting position on
ing being elongated in the direction of said guide
said block including a holder having a head
to permit adjustment of said stop-providing
and a shank, said shank receivable in said block
member relative to said holder.
`
45 socket and said front device engageable with
4. The combination With a chain block having
said shank for holding the latter in said socket,
a socket, of a holder having a head and a shank,>
and a bit-stop-p-roviding member cooperating
said shank receivable in said block socket, means
with said holder and engageable by said rear
carried by said block for securing said holder
device and adjustable by the latter into bit secur
shank in said block socket, a bit clamp cooper 50 ing position relative to said holder and said
ating with said block and holder, said clamp hav
block, said holder and said block cooperating to
ing an opening for receiving the inner portion
provide guiding means extending lengthwise of
of said holder head and the latter engaging said
said block »for guiding said stop-providing mem
said block, said stop-providing member having
clamp to hold the same yagainst said block, and
ber during adjustment thereof into’bit clamping
means separate from said shank securing means 55
position.
for adjusting said bit clamp into bit clamping
position relative to said holder and said block,
.
yCHARLES F. OSGOOD.
'
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