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Патент USA US2107942

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Feb. s, 1938.
2,107,942
M. P. HOLMES
CUTTER CHAIN
Filed July 30, 1934
a
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_ 5394444001"
Patented Feb. 8, 1938
UNITED STATES PATENT OFFICE
3,107,942
'
CUTTER CHAIN
Mglzl'lanvan
1'. Holmes,
Claaemont,
assigtiiior
t:
Machinery
ompany,N.a11.,
corpora
on 0
Massachusetts
Application July 30, 1934, Serial No. 737,495
11 Claims. (cl. 262-33)
This invention. relates to cutter chains, and
more particularlyrhas reference to improvements
in cutter bits and bit holders of a cutter chain
especially designed for use for mining purposes.
5
An object of this invention is to provide an
improved cutter chain. ‘Another object is to
provide an improved cutter bit and bit holder‘ for
a cutter chain. A further object is to provide
an improved mining machine cutter chain de10 signed to use for kerf-forming purposes and hav. ing improved cutter bit and bit-holding means.
Yet another object is to provide an improved
reversible or double-ended cutter bit for use with
5 for receiving a cutter bit, generally designated
6, of an improved design. A set screw 1 threaded
within the bit block is engageable with the bit
body for securing the bit within the bit block
socket. in a manner to be later described.
In 5
this illustrative construction, the boss 4 is cylin
drical and is supported by transverse end por
tions 8, 8 in spaced relation with respect to a
ledge 9, the latter arranged with its outer sur
face in a horizontal plane parallel to a plane 10
including the axes of the pivot pins 2, 2, the
parts being so formed as to provide an opening
I!) traversing the block beneath the bit socket
such a cutter chain, the bit having a plurality boss 4. The transverse supporting portions 8, 8
15 of cutting points of an improved design, and have integral, transversely extending ?n portions 15
improved positioning and holding means for po- II, II which act as clearing means for clearing
sitioning the bit in the bit block and holding the cuttings from the kerf cut by the chain, and
the bit in position in the block. These and other the ledge 9 cooperates with these clearing ?ns
objects will, however, subsequently more fully in removing the cuttings from the kerf. The
20 appear.
.
In the accompanying drawing‘ there are
shown, for purposes of illustration, two forms
which the invention may assume in practice.
In this drawing,_
25
Fig. 1 is a side elevational view of one iilustra-
tive embodiment of the improved cutter chain.
Fig, 2 is a, cross sectional view taken on line
2_2 of Fig, 1, with parts in elevation,
Flg, 3 is 9, plan view of the cutter chain show;
30 in Fig, 1,
Fig. 4 is a longitudinally extending, vertical
sectional view taken substantially on line 4-4
of Fig. 3, with parts in elevation and with a,
portion broken away to facilitate illustration.
35 Fig. 5 is a. perspective view of the improved
ledge 9 is provided with end abutment surfaces 20
I2, I 2 which abuttingly engage corresponding
surfaces on the adjacent bit blocks as the cut
ter chain travels in its guide, for instance, in a
guideway formed about the margin of a. plane
cutter bar or other suitable guide support. The 25
bosses 4 are formed on the bit blocks in different
locations on different blocks with respect to a
median plane at right angles to planes includ
ing the pivot pin 9: ‘es, and the sockets 5 trav
erse these bosses in different angularly related 3
planes so as to form a staggered arrangement of
the Cutter bits. in the manner Shown in Fig- 2,
of a width sufficient to out n. kerf to admit the
chain and its Cooperating guiding means.
The Improved cutter bit comprises a body I3, 35
cutter bit.
generally in the shape of a parallelogram in side
Fig_ 6 is a detail seetiona] view taken on line elevation and rectangular in cross section, and
5-6 of Fig, 4.
which has cutting points [4 and I5 formed at its
Fig. 7 is a cross sectional view taken substan- ends at the Opposite Sides of the bit body. The
40 tially on line '|_1 of Fig, 5,
points of the cutting portions are formed by cut- 40
Fig. 8 is a view similar to Fig. 4, showing a tins \away the body to provide rearwardly in
modi?ed form of construction,
\ clined cutting faces l6 and I1 obliquely disposed
Fig. 9 is an end elevational view of the bit Wit-h respect to the major axis of the bit. The
block and bit shown in Fig. 8.
front and rear edges of the bit body are trans
45
In the illustrative embodiment of the invention Versely grooved 01' Cut away at '3 and l9 to pro- 45
shown in Figs. 1 to 7, inclusive, I indicates the vide abutments 20 and 2|, and one of these abut
bit block, a series of which are pivotally eon-
ments is engageable with the outer surface of the
nected by pivot pins 2 directly together in endto-end relation to form an endless chain, one
block to limit inward movement of the bit within
its socket, while the other abutment underlies the
;0 end 3 of each bit block overlapping the end of
the adjacent bit block in the manner shown in
Fig. 2. Formed as an integral portion of the bit
block is a boss 4 arranged with its longitudinal
inner end of the setscrew so that. even if the set- 50
screw were slightly 10056. the bit could not be in~
advertently released from its socket. The cutting
portions at the ends of the bit have converging
axis parallel to the median line of the chain,
5 and this boss is traversed by a rectangular socket
side surfaces 22, 22 forming cutting points of
generally triangular shape in cross section, as 55
2,107,942
2
shown in Fig. 6, thereby to provide a generally
triangularshaped front cutting face, a design
whereby an improved cutting action is attained
even when the cutting point becomes slightly
dull. when the bit is within its socket, the front
and rear end faces of the bit body lie in parallel
planes extending transversely of the bit block
at right angles to a‘ plane including the axes of
the pivot pins. Viewed in side elevation, it will
elevation, with end and side surfaces lying in the
sides of a parallelogram, and rectangular in cross
section, the cutting portions at the opposite ends
of the bit body providing cutting points at the
opposite sides of the bit, and means formed on
the opposite side surfaces of the bit body viewed
in side elevation, providing abutments respectively
engageable with an outer surface of- a bit block
10 be noted that the cutting away of the bit as at l8
and It provides side surfaces lying in the sides
of a parallelogram and which lie in parallel planes
respectively including the cutting points l4 and
I5.
15
for limiting inward movement of the bit.within
a bit block socket and with means for holding the
bit within a bit block socket, said latter abut
ment means preventing release of the bit from a
bit block socket even when the bit holding means
is slightly released.
3. In a cutter chain, a bit block having a bit 15
.
In the modification shown, in Figs. 8 and 9, the
cutter bit 8 is identical to that disclosed in the
form above described, but, in this instance, is as
sociated with a different type of chain structure.
receiving socket, and a double-ended, reversible
cutter bit of narrow elongated form receivable in
The chain, in this form of the invention, com
20 prises a series of end-abutting bit blocks 30 pivot
said bit block socket, said bit having cutting por
tions at its opposite ends terminating in cutting
points and also having sides lying in parallel 20
planes passing through said cutting points re
ally connected by pivot pins 3| to strap links 32. I spectively, and means on the body of said bit be
The bit block body is traversed by a bit socket 33 tween said cutting portions and engageable with
terminating at its inner end with an enlarged the outer surface of the bit block for limiting in
opening 34 traversing the bit block. The ends of
,25 the bit block are provided with inclined abutment
surfaces 35 which are adapted abuttingly to en'
gage correspondingly shaped surfaces on the next
adjacent bit blocks. The bit is held within the
ward movement of the bit within the bit block 25
socket, said' limiting means being arranged on the
bit body outside of the parallel planes including
said sides of the bit and the cutting points of said
bit block socket by a setscrew 36 in the same man
30 ner as in the form of the invention above de
cutting portions.
v
4. In a cutter chain, a bit block having a bit
receiving socket, and a double-ended, reversible
cutter bit of narrow elongated form receivable in
is the same.
>
said bit block socket, said bit having cutting por
As a result of this invention, it will be noted tions at its opposite ends terminating in cutting
that an improved cutter chain is provided, hav
points and, also having sides lying in parallel .
ing improved cutter bit and bit-holding means planes passing through said cutting points re
whereby the bit is held within its bit block in an spectively, and means on the body of said bit
improved manner. It will further be noted that between said cutting portions and respectively en
an improved cutter bit of the double-ended type gageable with the outer surface of the bit‘ block
is provided, having improved means for position
for limiting inward movement of the bit within 40
ing the bit with respect to the bit block socket and the bit block socket and with holding means for
40
for securing the bit within the bit block socket. It preventing release of the bit from the bit block
will also be evident that by providing the cutting socket even when the holding means is slightly
portions of the bit with the particular shape of released, said limiting means being arranged on
cutting face and cutting points disclosed, an im
the bit body outside of said parallel planes in
proved cutting action is attained, while the wear
45 ing qualities of the bit are greatly increased. cluding said sides of the bit and the cutting points
of said cutting portions.
_
These and other uses and advantages of the im
5. A cutter chain comprising a bit block having
proved cutter chain will be clearly apparent to a bit-receiving socket, a double-ended, reversible
those skilled in the art.
'
cutter bit insertable in said socket, said bit hav
While in this application there are described ing a narrow elongated body terminating in cut
50
scribed; and otherwise this form of the invention
two forms which the invention may assume in
practice, it will be understood that these forms
are shown for purposes of illustration and that
the invention may be further modi?ed and em
55 bodied in various other forms without departing
from its spirit or the scope of the appended claims.
What I claim as new and desire to secure by
Letters Patent is:
'
1. A double-ended, reversible cutter bit having
60 a narrow elongated body terminating in cutting
portions at its opposite ends and provided, in
side elevation, with end and side surfaces lying
in the sides of a parallelogram, and rectangular
in cross section, the cutting portions at the oppo
65
site ends of the bit body providing cutting points
at the opposite sides of the bit, and means formed
on the opposite sides of the bit body viewed in
side elevation, providing abutments respectively
engageable with an outer surface of a bit block
for limiting inward movement of the bit within a
70
bit block socket and with means for holding the
bit within a bit block socket. '
75
2. A double-ended, reversible cutter bit having
a narrow elongated body terminating in cutting
portions at its opposite ends and provided, in side
ting portions at its opposite ends and provided,
in side elevation, with end and side surfaces lying
in the sides of a parallelogram, and of rectangu
lar cross section, means on said bit block engage
55
able with one such side surface of the bit body
for clamping the opposed side surface to one wall
of the bit block socket, and means on the bit body
engageable with the outer surface of the bit block '
for limiting movement of the bit upon insertion 60
thereof within the bit block socket.
6. A cutter chain comprising a bit block having
a bit-receiving socket, a double-ended, reversible
cutter bit insertable in said socket, said bit hav
ing a narrow elongated body terminating in cut
ting portions at its opposite ends and provided, in
side elevation, with end and side surfaces lying
in the sides of a. parallelogram, and of rectangu
lar cross section, means on said bit block engage- ‘
able with one such side surface of the bit body
for clamping its opposed side surface to one wall
of the bit block socket, means on the bit body‘en
gageable with said clamping means for prevent
ing inadvertent release of the bit from its socket
even when said clamping means is slightly re
2,107,942
socket, and said abutment means which are re
‘ 7. A cutter bit having a narrow elongated body
portions selectively engaging an outer surface on '
terminating in cutting portions at its opposite
ends and provided, in side elevation, with end
and side surfaces lying in the sides of a parallelo
gram, and of rectangular cross section, the cut
10 ting portions at its opposite ends providing cut
ting points at the opposite sides of the bit body and
having plane cutting faces inclined with respect
to the parallel side surfaces of the bit body, and
means formed on said parallel sides of the bit
15
3"
leased, and means on said bit body engageable
with an outer surface of the bit block for limiting
movement of the bit upon insertion thereof with
in the bit block socket.
body providing abutments respectively for limit
ing inward movement of the bit within a socket
of a bit block and engaging means for holding
the bit within a bit block socket.
-
8. A cutter chain comprising a. bit block hav-'
20 ing a bit-receiving socket, a double-ended, re
versible cutter bit insertable in said bit block
socket, said bit having a body of narrow elon
gated form terminating in cutting portions at its
opposite ends and provided with abutment means
spaced longitudinally of the bit body, one abut
ment means adjacent each cutting portion of the
bit, said bit being reversible end for end within
said bit block socket, and said abutment means
which are respectively the nearer to the then
30 active cutting portions selectively engaging an
outer surface on the bit block for limiting insertive
movement of the bit within said bit block socket
when said bit is in either of its end for end posi
tions within said socket.
35
9. A cutter chain comprising a bit block having
a bit-receiving socket, a double-ended, reversible
cutter bit insertable in said bit block socket, said
bit having a body of narrow elongated form ter
minating in cutting portions at its opposite ends
40 and provided with abutment means spaced longi
tudinally of the bit body, one abutment means
adjacent each cutting portion of the bit, said bit
being reversible end for end within said‘ bit block
spectively the nearer to the themactivecutting
the bit block for limiting insertive movement of
the bit within said, bit block socket when said
bit is in either of its end for end positions within
said socket, and holding means engageable with
the bit body for holding the bit within said bit
block socket when said bit is in either of its end
for end positions, said holding means engageable 10
with the abutment means which are not acting to
limit bit insertion respectively when said bit is
in either of its end for end positions within said
socket.
1
10. A cutter chain comprising a bit block hav
ing a socket, a double-ended, reversible cutter bit
insertable in said bit-receiving socket, said bit
having a narrow elongated body terminating in
cutting portions at its opposite ends ‘and pro
vided, in side elevation, with end and side surfaces
lying in the sides of a rhomboid, means on said
block engageable with one such side surface of the
bit body for clamping the opposed side surface to
one wall of the bit block socket, and means on the
bit body engageable with an outer surface of the
bit block for limiting insertive movement of the
bit within the bit block socket.
11. A double-ended, reversible cutter bit hav
ing a narrow elongated body terminating in cut
ting portions at its opposite ends and provided, 30
in side elevation, with end and side surfaces lying
in the sides of a rhomboid, the cutting portions at
the opposite ends of the bit body providing cut
ting points at the opposite sides of the bit, and
means formed on the opposite side surfaces of the
bit body viewed in side elevation, providing abut
ments respectively engageable with an outer sur
face of a bit block for limiting insertive movement
of the bit within a bit block socket and with
means for holding the bit within a bit block socket.
MORRIS P. HOLMES.
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