U.S. patent number 3,841,708 [Application Number 05/263,185] was granted by the patent office on 1974-10-15 for excavating tool device.
This patent grant is currently assigned to Kennametal Inc.. Invention is credited to Thomas J. Kniff, Donald L. Leibee, Seibert S. Oaks.
United States Patent |
3,841,708 |
Kniff , et al. |
October 15, 1974 |
EXCAVATING TOOL DEVICE
Abstract
An excavating tool device in which a tool which is symmetrical
about a longitudinal axis is provided with a longitudinal shank
rotatable in a bore in a support block while the support block is
provided with a mounting rib detachably connected to a yoke which
is adapted for being fixedly mounted on a drive member such as the
drum of a mining machine.
Inventors: |
Kniff; Thomas J. (Bedford,
PA), Leibee; Donald L. (Belfry, KY), Oaks; Seibert S.
(Everett, PA) |
Assignee: |
Kennametal Inc. (Latrobe,
PA)
|
Family
ID: |
23000739 |
Appl.
No.: |
05/263,185 |
Filed: |
June 15, 1972 |
Current U.S.
Class: |
299/104; 37/465;
175/354; 175/413; 299/107 |
Current CPC
Class: |
E21C
35/19 (20130101); E21C 35/197 (20130101) |
Current International
Class: |
E21C
35/00 (20060101); E21C 35/197 (20060101); E21C
35/19 (20060101); E21c 035/18 () |
Field of
Search: |
;299/86,91-93
;37/142R,142A |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Purser; Ernest R.
Attorney, Agent or Firm: Crosby; Melvin A.
Claims
What is claimed is:
1. A tool device for use with excavating equipment comprising; yoke
means having a leading end and a trailing end and having a bottom
side adapted for being fixedly mounted on a driving member which is
movable to drive the yoke means toward the leading end thereof,
said yoke means comprising spaced support legs extending in the
fore and aft direction and projecting upwardly away from said
member, block means comprising an upper portion and at least one
rib dependent from said upper portion and extending in the fore and
aft direction and disposed in parallel adjacent and at least in
part coextensive relation to said support legs and also having
leading and trailing ends, connector means extending transversely
through the legs on the yoke means and said rib detachably
connecting said block means to said yoke means, bore means
extending into said upper portion of said block means from the
leading end thereof in the fore and aft direction and so inclined
that the axis thereof diverges from the bottom side of said yoke
means in the direction of movement imparted to said yoke means and
block means by said member, tool means having shank means
receivable in said bore means and having working end means
concentric with said shank means and protruding outwardly from the
leading end of said bore means, cooperating elements of abutment
means on said tool means and block means to sustain working loads
imposed on said tool means, keeper means retaining said tool means
in said bore means while permitting rotation of the tool means in
said bore means, the side of said rib facing away from said upper
portion of said block means extending substantially parallel to the
direction of movement of the block means during working operations,
a rearwardly facing first abutment surface on the rear end of said
rib disposed in a plane substantially perpendicular to the axis of
said bore means in the block means, and a forwardly facing second
abutment surface on said yoke means parallel to and engaging said
first abutment surface.
2. A tool device according to claim 1 in which said upper portion
of said block means is connected to the trailing end of the said
rib.
3. A tool device according to claim 1 in which said upper portion
of said block means is connected to the leading end of the said
rib. l
4. A tool device according to claim 1 in which the said bore means
in the upper portion of said block means comprises a larger
diameter portion adjacent the leading end of said block means and a
smaller diameter portion adjacent the trailing end of said block
means, said bore portions being coaxial, and a forwardly facing
shoulder at the juncture of said portions of said bore means, said
tool means comprising shank means having a larger diameter leading
portion and a smaller diameter trailing portion and a rearwardly
facing shoulder at the juncture of said portions of said shank
means, said shank means being rotatable in said bore means and the
said shoulder on said tool means and the shoulder in said bore
means being in thrust transmitting engagement when said shank means
is disposed in said bore means, and keeper means carried by at
least one of said block means and shank means and operatively
engaging the other thereof for retaining said shank means in said
bore means and preventing any substantial degree of axial movement
of the shank means in the bore means while leaving said shank means
free to rotate in said bore means.
5. A tool device according to claim 1 in which said shank means is
in the form of a sleeve having an axial bore therein, said tool
means comprising a tool having a tool shank receivable in the axial
bore in said sleeve from the front end of the sleeve, said tool
having a working portion concentric with the axis of said tool
shank and protruding forwardly therefrom, said elements of abutment
means comprising a forwardly facing abutment surface on said sleeve
and a rearwardly facing abutment surface on said tool in engagement
therewith and a forwardly facing abutment surface in said bore
means and a rearwardly facing abutment surface on said sleeve in
engagement therewith, and a keeper means connecting said tool shank
to said sleeve and said sleeve to said block means permitting free
rotation of the tool shank in the sleeve and the sleeve in the bore
means while preventing any substantial forward movement of the tool
in the sleeve or the sleeve in the bore means.
6. A tool device according to claim 5 in which said keeper means
includes a resilient keeper element captive on said tool shank and
said sleeve comprises internal recess means engageable by said
keeper element when said tool shank is inserted into said
sleeve.
7. A tool device according to claim 1 in which the upper edges of
said legs incline downwardly toward the trailing end of said yoke
means, said block means comprising downwardly facing shoulders
parallel to and overlying the said upper edges of said legs, said
yoke means having a substantially flat upwardly facing surface
between said legs extending in the direction of movement of the
tool device during work operations, said rib on said block means
having a bottom surface parallel to and adjacent said upwardly
facing surface.
8. In an excavating tool device; a support block having leading and
trailing ends, a bore extending in the fore and aft direction
through the block, said bore adapted for receiving a tool having a
shank portion insertable into said bore from the forward end of the
bore and rotatable in the bore, forwardly facing abutment means on
said block concentric with said bore for engagement with rearwardly
facing abutment means on the tool, the said tool including a
working portion concentric with the shank portion and protruding
outwardly from the forward end of the bore when the shank portion
is seated in the bore, keeper means adapted for operatively
interconnecting said tool and block and preventing any substantial
degree of axial movement of the tool in said bore while permitting
free rotation of the tool in said bore, said block having at least
one fore and aft rib integral therewith and projecting therefrom
substantially in a plane which contains the axis of said bore, said
rib including a lateral bore for receiving a pin for connection of
the block to a support member, and means forming a rearwardly
facing abutment region at the trailing end of said rib
substantially perpendicular to and laterally offset from the axis
of said bore and adapted for engagement with a forwardly facing
abutment region on a said support member, the side of said rib
which faces away from said block extending in the direction of
movement of said block, the axis of said bore and the said side of
said rib diverging in the forward direction.
9. A tool device according to claim 8 in which said bore comprises
a larger diameter forward portion and a smaller diameter rearward
portion and said abutment means comprises a forwardly facing
shoulder at the juncture of said bore portions.
10. A tool device according to claim 9 in which said portions of
said bore are about equal in axial length and said shoulder is in
about the middle of the length of said bore.
11. A yoke especially adapted for receiving a block for supporting
a rotary mining tool, the block having a dependent fore and aft
rib, said yoke comprising a base having a bottom surface with
leading and trailing ends and adapted for mounting on a driving
member for being driven thereby in the forward direction toward the
leading end of said bottom surface, spaced parallel legs fixed to
said base along the side edges thereof and extending in the fore
and aft direction and diverging from said bottom surface in the
forward direction, said legs adapted for closely receiving said rib
therebetween, registering lateral bores in said legs near the
forward ends for receiving a pin to connect the rib to the legs,
and an abutment element on said base and upstanding therefrom near
the trailing end having a forwardly facing abutment surface
substantially perpendicular to the axis of the rotary tool and
laterally offset therefrom, said surface adapted to abut a
rearwardly facing abutment region on a rib disposed between said
legs.
Description
The present invention relates to tool devices for mining and
excavating and is particularly concerned with a tool device of the
nature referred to so constructed and arranged as to be highly
flexible with regard to the field of application and the
adaptability thereof to various mining and excavating
conditions.
Many excavating and mining tools employ drums and the like on which
tools are mounted in distributed relation and which tools are
driven into a formation to be reduced by movement of the drive
member to drive the tools into the formation while advancing the
drive member bodily towards the formation.
The present invention is particularly concerned with an improved
tool device and mounting arrangement therefor for use with such
mining and excavating machines.
A particular object of the present invention is the provision of a
tool device and a mounting arrangement therefor having a wide range
of adaptability to mining machines of various types.
Another object of the present invention is the provision of a tool
device and a mounting arrangement therefor which provides a wide
variation of tool placements on the member which drives the
tool.
A still further object is the provision of a tool device for mining
and excavating machines which has long life and which includes
easily replaceable parts to permit the machine to remain in service
substantially without interruption.
These and other objects and advantages of the present invention
will become more apparent upon reference to the following detailed
specification taken in connection with the accompanying drawings in
which:
FIG. 1 is a side view showing a tool device and a support
arrangement therefor according to the present invention and mounted
on a drum-like supporting member.
FIG. 2 is a view looking in from the right side of FIG. 1.
FIG. 3 is a fragmentary view showing a pin forming a keeper for
retaining the tool device in the support block therefor.
FIG. 4 is a view like FIG. 3 but shows a different type of keeper
for holding the tool in the block.
FIG. 5 is a perspective view showing the retaining device or keeper
according to FIG. 4.
FIG. 6 is a fragmentary sectional view showing a modified type of
tool device.
FIG. 7 is a fragmentary view showing a heavy duty tool adapted for
mounting in a support block.
FIG. 8 is a view similar to FIG. 1 but shows a modified arrangement
wherein the tool is supported so that the working end thereof is
nearer to the surface of the supporting member or drum than is the
working end of the tool in the FIG. 1 arrangement.
FIG. 9 is a sectional view showing a block like that of FIG. 8 but
with a one piece tool mounted in the bore thereof.
FIG. 10 is a perspective view partly broken away showing a modified
form which the support yoke for the blocks can take.
FIG. 11 is a fragmentary view of a block similar to that of FIGS. 8
and 9 but showing the tool retained in the block by means of a
keeper pin.
BRIEF SUMMARY OF THE INVENTION
According to the present invention, a yoke is provided adapted for
mounting on a driven member of a mining or excavating machine. The
driven member may comprise a drum and the yoke is adapted for being
fixed to the drum as by welding. A block is provided having a
support rib adapted for detachable connection with the yoke as by a
connecting pin extending through aligned apertures in the yoke and
the supporting rib on the block.
The block is provided with a bore which diverges from the surface
of the supporting member in the direction in which the yoke and
block are driven by the supporting member and this bore is adapted
for rotatably receiving a tool concentric with, and symmetrical
about, the axis of the bore and projecting therefrom in the forward
direction.
The tool may comprise a single element consisting of a shank
portion receivable in the bore in the block and a working portion
projecting forwardly from the shank portion and protruding out the
front of the block, or the tool may consist of a sleeve rotatable
in the bore in the block with a tool of the above mentioned nature
rotatably mounted in the sleeve and protruding from the forward
end.
The support block which receives the tools comprises a supporting
rib adapted for detachable connection to the yoke and a portion
connected to the upper side of the rib in which the aforementioned
bore is formed. This last mentioned portion can upstand from the
leading end of the rib or from the trailing end thereof and, since
the bore can receive tools of different lengths, and either one
part or two part tool devices, a plurality of different cutting
radii can easily be achieved with one and the same basic supporting
and drive member with yokes mounted thereon.
In practice, the yokes are distributed axially and
circumferentially of the driving member, such as a drum, and in
this manner complete and continuous treatment of the entire
formation presented to the drum is accomplished. In general, the
tools will be disposed in radial planes perpendicular to the axis
of the drum, but it is also possible for at least the tool device
near the ends of the drum to be tilted axially outwardly thereby to
make certain that the amount of the formation reduced by the tool
devices on the drum will be at least as long as the drum.
DETAILED DESCRIPTION OF THE INVENTION
Referring to the drawings somewhat more in detail, in FIGS. 1 and
2, reference numeral 10 designates a supporting member which is in
the form of the drum of a mining machine. The drum rotates in a
clockwise direction as viewed in FIG. 1 and is advanced bodily
toward the right, also as viewed in FIG. 1, while rotating.
Secured to the drum in circumferentially and axially distributed
relation are yokes which, in the illustrated modification, take the
form of a pair of legs 12 and 14 in parallel spaced relation
fixedly secured to the drum as by welding.
The yoke is adapted for detachable connection with a block
generally indicated at 16 and having a rib portion 18 receivable in
the space between legs 12 and 14. Registering holes, 20 in rib 18,
22 in leg 12, and 24 in leg 14 receive a connector pin 26 which may
be held in place in any suitable manner as, for example, by snap
rings 28 snapped in grooves formed in the pin 26 immediately
outside legs 12 and 14.
Rib 18 has a bottom surface 30 closely adjacent the surface of drum
10 and at the trailing end has an upwardly and rearwardly inclined
rearwardly facing abutment surface 32. Abutment surface 32 is
adapted for abutting engagement with the upwardly and rearwardly
inclined forwardly facing abutment surface 34 formed on abutment
element 36 fixedly arranged between the trailing ends of legs 12
and 14, as by being welded to the legs or to the surface of drum
10.
Projecting upwardly from the upper side of supporting rib 18 is
another portion 38 of the block which, as will best be seen in FIG.
2, is wider in the lateral direction than supporting rib 18.
Portion 38 is formed with the downwardly facing shoulders 40 which
are parallel to and in opposed relation to the downwardly and
rearwardly inclined upper edges 42 of legs 12 and 14.
The leading face of at least portion 38 of the block, as indicated
at 44, inclines rearwardly in the upward direction and portion 38
is, furthermore, formed with a bore 46 extending through face 44
and perpendicular thereto. The axis of bore 46 will be seen to
diverge from the surface of drum 10 in the direction in which the
yoke and block are moved when drum 10 rotates in its working
direction.
Bore 46 has a larger diameter leading part 48 and a smaller
diameter trailing part 50 and a forwardly facing shoulder 52 at the
juncture of the said parts and which shoulder tapers outwardly
toward the leading side of the block. Bore 46 rotatably receives a
sleeve member 54 having a larger diameter forward portion and a
smaller diameter rearward portion, indicated at 56 and 58
respectively with a rearwardly facing shoulder 60 at the juncture
of said portions engaging shoulder 52 of the bore in the block.
The forward end of sleeve 54 protrudes outwardly from the leading
end of bore 46 and comprises a radial flange 62 which may engage
the front end of portion 38 of the block or which may be axially
spaced therefrom. The sleeve 54, in the FIG. 1 modification,
extends completely through portion 38 of the block and is rotatably
retained in the block by a keeper in the form of snap rings 64
seated in grooves in the rearwardly protruding portion of the
sleeve.
Sleeve 54 is provided with a bore 66 adapted for receiving the
shank 68 of a tool which has a working portion 70 projecting
forwardly from the front end of the shank portion and terminating
in a hard wear resistant tip 72 which may consist, for example, of
a cylindrical insert of cemented tungsten carbide with a point at
the outer end.
At the juncture of the shank portion of the bit with the working
portion thereof there is a tapered seat 74 engaging a
correspondingly tapered mouth on the bore 66 in the sleeve.
The shank portion of tool 70 is provided with an annular groove 76
in which is seated an annular resilient keeper element 78 having at
least one radial protuberant portion thereon engaging annular
recess 80 formed in the bore 66 in sleeve 54.
In the described arrangement, sleeve 54 is rotatably supported in
the block and tool 70 is rotatably supported in the sleeve. Working
thrusts imposed on tool 70, and which will be substantially in the
axial direction thereof, are transmitted to the sleeve via the
tapered interengaging seat regions formed thereon and these thrusts
will, in turn, be transmitted from the sleeve to the block via the
interengaging shoulders 52 and 60. The thrusts exerted on the block
are carried by the pin 26 and the interengaging abutment surfaces
32 and 34.
Inasmuch as the tool 70 can quickly be replaced in the sleeve, and
inasmuch as the sleeve can easily be replaced in the block and,
furthermore, since the block can easily be replaced in the yoke,
the minimum amount of time is lost in connection with replacing the
tools and the supporting parts thereof.
This is important in respect of mining machines because the tools,
and the parts supporting the tools, are subjected to a high degree
of abrasion and are heavily loaded, and are also somewhat
unpredictably loaded because formations vary in hardness. Thus,
tools can wear out quite quickly at certain times and breakage can
also occur. It is, thus, quite important to be able to replace
tools and parts supporting the tools quickly and easily in order to
maintain the machine on which the tools are mounted in
operation.
As will be further developed hereinafter, the arrangement
illustrated for connecting the tools with the supporting member of
the mining machine is also of considerable merit because it permits
wide variation in the positioning of the working end of the tool to
accommodate the assembly to different working conditions to permit
the tool to be adapted to various types of machines.
The sleeve in the FIG. 1 modification is held in place in the
supporting block when the snap ring is 64 mounted on the sleeve but
other arrangements for holding the sleeve in the block can also be
used. For example, in FIG. 3, a block 81 is illustrated having a
shouldered bore 82 therein in which shouldered sleeve 84 is
mounted.
For retaining sleeve 84 rotatably in block 80, the smaller diameter
end of the sleeve is formed with an annular groove 86 while a
transverse hole drilled in the block, and intersecting the
periphery of bore 82 in the plane of groove 86, is adapted for
receiving a pin 88 which loosely engages groove 86. Pin 88 forms a
keeper which will prevent the sleeve from coming out of bore 82
while, at the same time, the sleeve is free to rotate in the
bore.
In FIG. 4, block 90 has a shouldered bore 92 extending therethrough
in which shouldered sleeve 94 is mounted. The smaller diameter
portion of sleeve 94 is provided with a somewhat elongated fairly
shallow annular groove 96 and disposed in groove 96 is a resilient
slit ring 98 having a protuberant region 100 thereon engageable
with the inwardly opening annular groove 102 formed in the smaller
diameter portion of bore 92.
The resilient keeper ring 98 is shown in perspective in FIG. 5 and
will be seen to comprise a strip of spring steel somewhat bowed in
cross section and split and having dimple-like portions forming the
aforementioned protuberant portions 100.
In FIG. 6, block 110 is provided with a straight bore 112 extending
therethrough which rotatably receives a sleeve 114 having a radial
flange 116 at the front end of block 110 which takes a bearing on
the front end of the block. Sleeve 114 can be retained in the block
in any of the aforementioned manners and is shown as having snap
rings 118 mounted thereon on that portion of the sleeve which
protrudes from the back end of block 110.
All of the modifications previously referred to employ a tool in
the form of a sleeve with a bit rotatably mounted in the sleeve.
However, and particularly where hard formations are encountered, it
is desirable to employ a heavier pick than can be mounted in a
sleeve thereby to reduce the possibility of damage of breakage of
the tool.
Such a pick type tool is shown in FIG. 7 wherein a block 120 is
provided which has a shouldered bore 122 therein which receives a
pick type bit 124 having a forward portion fitting in the larger
diameter portion of bore 122 and a smaller diameter portion fitting
in the smaller diameter portion of the bore. A shoulder connecting
the two portions of the pick type bit bears on the shoulder in the
bore in block 120. The bit 124 can be retained in assembled
relation with block 120 by a keeper of any desired type and FIG. 7
shows the keeper in the form of snap rings 126 mounted on the end
of the bit which protrudes from the rear end of the block.
The bit of FIG. 7 has a conical front end portion 128, the same as
the tool bit 70 of the FIG. 1 modification, but, due to the larger
dimensions of the body of the bit, a substantially larger pointed
hard insert 130 can be mounted at the tip of the bit body. As
before, the pointed insert 130 can be formed of cemented hard metal
carbide material, such as tungsten carbide, the same as the pointed
insert 72 of the FIG. 1 modification.
A feature of the present invention is that the dimensions of the
body of the bit of FIG. 7 are the same within the range of the bore
of the block as those of the sleeves previously described so that,
at any time, a sleeve together with the tool bit mounted therein
can be removed from a block and a heavy duty bit of the type
illustrated in FIG. 7 placed in the block.
This exchange will permit the mining machine to proceed and to
carry out heavy duty excavating operations and, at any time the
formation ceases to be of such a nature to require a heavy duty
bit, the heavy duty bit can be removed from the block and be
replaced by a sleeve having a tool bit mounted therein.
FIG. 8 shows an arrangement somewhat similar to that of FIG. 1 and
corresponding parts such as the drive member and the yoke bear the
same reference numerals. The bit and sleeve in FIG. 8 also
correspond substantially to those illustrated in FIG. 1, but the
block supporting the sleeve and pick and connected to the yoke is
different.
In FIG. 8, the block generally designated 140 has a web portion 142
disposed between the legs of the yoke and an upstanding portion 144
which is bored to receive the sleeve, but which is disposed near
the rear end of web 142. By constructing the block in this manner,
the point end of the bit is radially closer to the surface of drive
member 10 than is the point end of the bit in the modification of
FIG. 1.
FIG. 9 shows a support block 150 of the same general type which has
been described, except in the upstanding portion 152 there is
provided a bore 154 for receiving the shank portion 156 of a bit
158. The bore 154 is provided with a groove 160 and mounted on the
shank of the bit is a spring clip retainer 162 which engages groove
160 when the bit is in place in the block and rotatably supports
the pick in the block.
FIG. 10 shows a modified yoke 170 having the legs 172 and 174
thereof integral with a base portion 176. Disposed between the leg
portions and resting on the base portion is the abutment element
178 which is advantageously welded about its entire rearwardly
facing peripheral edge to the yoke.
FIG. 11 shows a block 180 similar to that block shown in FIG. 8,
but wherein the upstanding portion 182, and which is positioned
toward the rear of the web portion 184 of the block, is a bore 186
for receiving the shank 188 of a pick type bit 190 and with the bit
being rotatably confined within the block by a pin 192 in the block
loosely engaging annular groove 194 in the shank of the bit.
Modifications may be made within the scope of the appended
claims.
* * * * *