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Патент USA US2106749

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Feb. 1, 1938.
I
J. |_. KNIGHT
2,106,749
COMBINATION MINING BIT GAUGE AND WRENCH
Filed March 21, 1935
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2 Sheets-Sheet l
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:25“N.
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Feb. 1, 1938.
J_ L, KMGHT
I
2,106,749
COMBINATION MINING BIT GAUGE AND WRENCH
Filed March 21, 1935
2 Sheets-Sheet 2
3mm
/' I Jame
W14
Patented Feb. 1, 1938
2,106,749
UNITED STATES PATENT OFFICE
2,106,749
COIWBINATIGN MINING BIT‘ GAUGE AND
WRENCH
Jesse L. Knight, Powellton, W. Va., assignor of
one~half to J. A. Burgess, Montgomery, W. Va.
Application March 21, 1935, Serial No. 12,319
7 Claims.
(01. 7—1)
This invention relates to a combination min
ing bit gauge and wrench and has for an object
Figure 4 is an end view looking from the left
of Figure 2,
to provide an improved combination mining bit
Figure 5 is an enlarged sectional view taken
on the line 5-5 of Figure 1, showing the wrench
gauge and wrench for use in coal mine ma
5 chinery, especially that part of the mining ma
chine which is used in the cutting of the coal.
The coal cutting machine as used in the mines
for undercutting the coal has a chain equipped
with lugs which have fastened in them by a set
,10 screw a bit which forms a very coarse saw for
applied, and
5
Figure 6 is an enlarged sectional view taken on
the line 6—-6 of Figure 3.
There is shown at In the combination mining
machine bit and wrench of this invention. This
invention I0 includes a conventional mining ma 10
cutting the coal. As an example of such a coal
chine bit Wrench ll having the usual wrench
cutting machine may be mentioned the device
illustrated in the patent to Teller, 979,597, of
December 27, 1910.
.15
These cutting bits have to be removed and re
sharpened very frequently and it is a problem to
head l2 preferably in the form of a socket wrench
head, which for this purpose is intended to ?t a
set these bits in the chain all evenly. A num
ber of hand gauges have been devised for this
purpose, but the machine operators usually fail
20 to make use of these gauges and insteadxdepend
on the eye for this very essential operation.
By using the invention herein set forth the
operator can only set the bit to the standard
length allowed by the gauge and wrench, for if
25 the bit is out even as little as one-sixteenth of
an inch too much, he cannot tighten the set screw
which holds the bit in the lug until he has put
the bit in to the proper length.
A number of very dangerous conditions will
be eliminated by use of this invention, ?rst, care
less setting of the machine bits have caused a
number of men to have their legs broken through
the machine kicking back from the coal when the
bits are set uneven; second, setting the bit ac~
' curately will cause the machine to produce more
ef?ciently; third, the setting of the bit accurately
reduces the power necessary for
operation;
“A, inch square head bit screw. So that the
wrench may be more easily applied instead of 15
the head being provided with a single square
wrench receiving socket it is provided with two
square wrench receiving sockets spaced forty-?ve
degrees apart, thereby providing one socket hav
ing its sides i3 parallel to and at right angles 20
to the longitudinal direction of the handle of
the wrench It and the other socket having its
sides M at forty-?ve degrees to the direction of
the length of the handle of the wrench H.
With this construction it is possible to turn
the set screw IE to which it is to be applied in
small increments at a time thereby allowing the
wrench to be applied at the most convenient an
gle. In the mining machine the saw 16 has the
bit I‘! secured thereto by means of the set screw 30
Hi.
It is very essential that the bit ll project
from the saw It the same distance for each
bit, and this distance is preferably two-and-one
half inches from the center of the set screw l5.
As the saw it is used, the bit ll becomes dull and 35
it becomes necessary to remove the bit I‘! from
the saw I B and resharpen the same, and then
fourth, the setting of the bit accurately causes
replace it in position.
much less slack coal to be produced, as a smaller
This invention insures that the bit I‘! shall be
replaced in proper position and not be allowed
kerf is cut in the solid coal; ?fth, greater saving
will be effected in reducing the maintenance cost
of the equipment, for long bits have caused many
accidents and damage to machinery and have
created much unnecessary expense in the mining
industry.
With the foregoing and other objects in view,
as will hereinafter become apparent, this inven
tion comprises the constructions, combinations,
and arrangements of parts, hereinafter set forth,
50 disclosed and shown on the accompanying draw
ings. In the drawings,
Figure 1 is a plan View of the invention,
Figure 2 is a side elevation of the same,
Figure 3 is an end view looking from the right
55 of Figure 2,
to project further from the saw l6 than this
exact desired amount. To insure this a gauge
[8 is added to the wrench II. This gauge l8
consists of a quarter circular shield or limited
member I9 which is welded as at 20 to the wrench
Ii. This shield or limited member l9 extends
through an arc of 90° being 45° on each side of
the center of the handle of the wrench H . This
shield or limited member NJ has a radius of two
and-one-half inches from the center of the
wrench head 12 which is the same distance as the
desired distance from the center of the set screw
15 to the sharpened ends of the machine bit I'l.
Extending back from the center of the quarter
circular shield or limited member I9 is a rein
2
2,106,749
forcing ?ange 2| which is welded as at 22 along
the top of the handle of the wrench I I, the flange
2| being Welded to the shield I9 as at 23. The
welding 23 continues along the side of the handle
of the wrench I I where the shield or limited
member has been secured to the handle by insert
ing the handle through the aperture 24 in the
shield or limited member I9. As will be appar
ent, the shield or limited member I9 and the
10 reinforcing ?ange 2| properly assembled, as
cured thereto, said gauge comprising a curved
limiting member having a radius equal to the
desired length the mining machine bit is to ex
tend from the center of its securing set screw, and
a reinforcing ?ange secured to the outer side of
said limiting member and to said wrench.
3. As an article of manufacture, a mining ma
above described, form the gauge on the wrench
chine bit gauge comprising a wrench socket, a
H, thereby making the combination mining ma
wrench handle, a limiting member mounted on
said wrench handle a distance from the center of
said wrench socket equal to the distance that the
bit should extend from the center of the mining
machine, and a reinforcing ?ange secured to the
back of said limiting member and to the top of
said handle.
chine bit gauge and wrench ID of this invention.
To assemble this invention the shield or limited
member I9 may have the handle of the wrench I I
inserted through the opening 24 in the shield I9.
The shield or limited member I9 is then moved
over the handle until it is a desired proper dis
tance from the head I2 and the weld 20 is formed
20 thereabout to hold the shield or limited member
I9 in position. The reinforcing ?ange 2! is then
placed in proper position on the top of the handle
of the wrench II against the back of the shield
or limited member I9 and the additional welds 22
and 23 are made thereby securely holding the
shield or limited member I9 in its proper gauging
position.
In using this invention the head I2 of the
wrench II is placed in position on the head of
the set screw l5 while the mining machine bit I‘!
is still loose in the saw I6. The bit I1 is then
4. As an article of manufacture, a mining ma
chine gauge for an adjustably secured bit com 20
prising a wrench socket, a wrench handle, and a
curved limiting member mounted on said wrench
handle a distance from said wrench socket equal
to the distance that the bit should extend from
its securing means on the mining machine, and a 25
reinforcing ?ange secured to the back of said
curved limiting member.
5. A mining machine bit limiting member for
attachment to a mining machine set screw
wrench, the wrench having a set screw engaging 30
portion and a longitudinal member extending
pulled outwardly until its edge just barely con
from said portion, said limiting member having
tacts with the inside of the shield or limited mem
ber I9. With the bit thus in the proper meas
a curvature with a radius equal to the distance
35 ured position the wrench II is then operated to
tighten the set screw I5 and hold the bit IT at
the desired position. Obviously, the set screw
cannot be tightened if the bit I 1 should be too far
out, as it would then prevent the wrench from
40
2. A combination mining machine bit gauge
and wrench comprising a mining machine set ,,
screw wrench, a mining machine bit gauge se
operating.
By so using the combination gauge and wrench
all the bits I1 along the saw I6 will be set evenly
to the same length, and it will be impossible to
have any individual bits I‘! set at any greater
distance with the undesirable results following
from such improper setting.
The novel features and the operation of this
device will be apparent from the foregoing de
scription. While the device has been shown and
the structure describedin detail, it is obvious that
this invention is not to be considered limited to
the exact form disclosed and that changes may
be made therein within the scope of what is
claimed, without departing from the spirit of the
invention.
55
Having thus set forth and disclosed the nature
of this invention, what is claimed is:
1. A combination mining machine bit gauge
and Wrench comprising a 'mining machine set
screw wrench, and a mining machine bit gauge
60
secured thereto, said gauge comprising a curved
limiting member having'a radius equal to the
desired length the mining machine bit is to ex
tend from the center of its securing set screw.
that the tip of the mining machine bit should
extend from the center of the mining machine 35
bit securing set screw, said limiting member hav
ing an aperture through which the longitudinal
member of the set screw wrench may extend.
6. A bit limiting member for attachment to a
mining machine set screw wrench having a set 40
screw engaging portion and a longitudinal mem
ber extending from said portion, the limiting
member being attachable to said longitudinal ex
tending member a distance from the set screw en
gaging portion equal to the distance the tip of the 45
bit should extend from the center of the mining
machine bit securing set screw, the limiting mem
ber having an aperture through which the longi
tudinal member is to extend.
'7. A bit limiting member for attachment to a
mining machine set screw wrench having a set
screw engaging portion and a longitudinal mem
ber extending from said portion, the limiting
member being attachable to said longitudinal ex
tending member a distance from the set screw en
gaging portion equal to- the distance the tip of
the bit should extend from the center of the min
ing machine bit securing set screw, the limiting
member having an aperture through which the
longitudinal member is to extend, and a rein
forcing ?ange from the back of said limiting
member.
JESSE L. KNIGHT.
55
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