U.S. patent application number 13/955094 was filed with the patent office on 2015-02-05 for pick tool with a removable shank.
The applicant listed for this patent is Braeden Brown, David R. Hall, Francis E. Leany, Benjamin J. Spence, David C. Wahlquist. Invention is credited to Braeden Brown, David R. Hall, Francis E. Leany, Benjamin J. Spence, David C. Wahlquist.
Application Number | 20150035344 13/955094 |
Document ID | / |
Family ID | 52427017 |
Filed Date | 2015-02-05 |
United States Patent
Application |
20150035344 |
Kind Code |
A1 |
Hall; David R. ; et
al. |
February 5, 2015 |
Pick Tool with a Removable Shank
Abstract
Pick tool assemblies for use with formation degradation
machines, such as road milling, mining, trenching or drilling
machines, may be disposed on rotatable drums, wheels, continuous
chains, drill bits or the like and brought into engagement with
such formations as rock, asphalt, coal or concrete to break up or
otherwise degrade the formations. Such pick tool assemblies may
comprise a shank comprising a forward end and a rearward end
wherein the rearward end may be formed for retention in a bore of a
block attached to a driving mechanism and the forward end may
comprise a body detachably and nonrotatably fastened thereto.
Further, an impact tip may be bonded opposite the rearward end.
Inventors: |
Hall; David R.; (Provo,
UT) ; Leany; Francis E.; (Salem, UT) ;
Wahlquist; David C.; (Spanish Fork, UT) ; Brown;
Braeden; (Provo, UT) ; Spence; Benjamin J.;
(Riverton, UT) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hall; David R.
Leany; Francis E.
Wahlquist; David C.
Brown; Braeden
Spence; Benjamin J. |
Provo
Salem
Spanish Fork
Provo
Riverton |
UT
UT
UT
UT
UT |
US
US
US
US
US |
|
|
Family ID: |
52427017 |
Appl. No.: |
13/955094 |
Filed: |
July 31, 2013 |
Current U.S.
Class: |
299/113 |
Current CPC
Class: |
E21C 35/18 20130101;
E21C 35/1831 20200501 |
Class at
Publication: |
299/113 |
International
Class: |
E21C 35/18 20060101
E21C035/18 |
Claims
1. A pick tool assembly, comprising: a shank comprising a forward
end and a rearward end; the rearward end formed for retention in a
bore of a block attached to a driving mechanism; the forward end
comprising a body detachably and nonrotatably fastened thereto; and
an impact tip bonded opposite the rearward end.
2. The pick tool assembly of claim 1, wherein the impact tip is
bonded to the forward end.
3. The pick tool assembly of claim 2, wherein the forward end is
disposed within a cavity passing completely through the body.
4. The pick tool assembly of claim 1, wherein the impact tip is
bonded to the body.
5. The pick tool assembly of claim 4, wherein the forward end is
disposed within a socket of the body.
6. The pick tool assembly of claim 5, wherein the body comprises a
radial flange disposed adjacent the socket that transfers forces to
an outer shelf disposed around an exterior of the forward end.
7. The pick tool assembly of claim 5, wherein the forward end is
press fit within the socket of the body.
8. The pick tool assembly of claim 7, wherein the forward end is
hollow to aid in the press fit.
9. The pick tool assembly of claim 7, wherein the forward end is
slotted to aid in the press fit.
10. The pick tool assembly of claim 7, wherein the forward end is
tapered to aid in the press fit.
11. The pick tool assembly of claim 5, wherein the forward end
comprises a compliant ring disposed thereon to aid in retention
within the socket.
12. The pick tool assembly of claim 5, wherein the forward end
comprises a pin insert to aid in retention within the socket.
13. The pick tool assembly of claim 1, wherein the impact tip is
brazed to the body.
14. The pick tool assembly of claim 1, wherein the shank is
nonrotatably retained in the bore of the block.
15. The pick tool assembly of claim 1, wherein the driving
mechanism comprises a drum, wheel, chain, or bit.
16. The pick tool assembly of claim 1, wherein the impact tip is
disposed within a recess of the body.
17. The pick tool assembly of claim 1, wherein the body comprises
at least one detachment groove disposed adjacent the forward
end.
18. The pick tool assembly of claim 1, wherein the forward end
comprises at least one detachment groove disposed adjacent the
block.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to U.S. Provisional Pat.
App. No. 61/678,384 filed on Aug. 1, 2012, which is incorporated
herein by reference for all that it contains.
BACKGROUND OF THE INVENTION
[0002] The present invention relates generally to formation
degradation machines such as the type used in road milling, mining,
trenching or drilling. More specifically, the present invention
relates to pick tools used by formation degradation machines for
engaging and degrading a formation. Pick tools may be disposed on
rotatable drums, wheels, continuous chains, or drill bits and
brought into engagement with such formations as rock, asphalt, coal
or concrete to break up or otherwise degrade the formations.
[0003] While degrading a formation, pick tools may be subjected to
severe abrasion and thermal wear. However, different portions of
pick tools may wear at different rates. For example, exposed
portions of a pick tool may experience rapid wear while shielded
portions may experience little to no wear. Thus, it may be
desirable to replace those portions experiencing the most wear
relatively frequently while retaining those portions in place that
receive less wear.
[0004] An example of a pick tool is found in U.S. Patent No.
7,401,863 to Hall et al., herein incorporated for all that it
contains, which discloses a pick comprising a shank attached to a
base of a steel body, a cemented metal carbide core press fit into
the steel body opposite the shank, and an impact tip bonded to a
first end of the core opposite the shank. In this example, wear on
any portion of the pick tool may require replacement of the entire
tool, thus wasting unworn material.
[0005] Another example of a pick tool is found in U.S. Pat. No.
4,804,231 to Buljan et al., herein incorporated for all that it
contains, which discloses a cutter bit holder that has a
replaceable cutter tip which can be replaced in the field when the
cutter tip is worn by unscrewing a flange from the shank of the
holder and replacing the worn cutter tip with a new one. However,
Buljan et al. relies on a threaded connection that may undesirably
rotate during use.
[0006] Thus, while known pick tools may have proven acceptable for
their intended applications, there remains a need for improvement
in the pertinent art.
BRIEF SUMMARY OF THE INVENTION
[0007] A pick tool assembly may comprise a shank comprising a
forward end and a rearward end wherein the rearward end may be
formed for retention in a bore of a block attached to a driving
mechanism and the forward end may comprise a body detachably and
nonrotatably fastened thereto. Further, an impact tip may be bonded
opposite the rearward end.
[0008] In some embodiments of the pick tool assembly, the impact
tip may be bonded to the forward end. In such embodiments, the
forward end may be disposed within a cavity passing completely
through the body.
[0009] In other embodiments, the impact tip may be bonded to the
body such as by being brazed in a recess of the body or some other
means known in the art. In such embodiments, the forward end may be
disposed within a socket within the body. To aid in transferring
forces between the body and the shank, the body may comprise a
radial flange disposed adjacent the socket that may interact with
an outer shelf disposed around an exterior of the forward end.
[0010] The forward end may be press fit within the socket of the
body. To aid in the press fit, the forward end in various
embodiments may be hollow, slotted, tapered or combinations
thereof. In some embodiments, the forward end may comprise a
compliant ring disposed thereon or a pin insert to aid in retention
within the socket.
[0011] The driving mechanism may comprise a drum, wheel, chain, or
bit with a block attached thereto. The shank of the pick tool
assembly may be nonrotatably retained in the bore of the block.
Also, the body may comprise at least one detachment groove disposed
adjacent the forward end to aid in detaching the body from the
forward end and the forward end may comprise at least one
detachment groove disposed to aid in detaching the shank from the
block.
BRIEF DESCRIPTION OF THE FIGURES
[0012] FIG. 1 discloses an orthogonal view of an embodiment of a
road milling machine comprising a rotatable drum.
[0013] FIG. 2 discloses a cut-away orthogonal view of the rotatable
drum of the embodiment shown in FIG. 1.
[0014] FIGS. 3a, 3b and 3c respectively disclose exploded
orthogonal, unexploded orthogonal and longitudinal section views of
an embodiment of a pick tool assembly comprising a slotted
shank.
[0015] FIG. 4 discloses an orthogonal view of another embodiment of
a pick tool assembly comprising a flanged shank.
[0016] FIG. 5 discloses a longitudinal section view of another
embodiment of a pick tool assembly comprising a hollow slotted
shank.
[0017] FIG. 6 discloses a longitudinal section view of another
embodiment of a pick tool assembly comprising a compliant ring.
[0018] FIGS. 7a and 7b respectively disclose orthogonal and
longitudinal section views of another embodiment of a pick tool
assembly comprising a pin insert.
[0019] FIG. 8 discloses a longitudinal section view of another
embodiment of a pick tool assembly also comprising a pin
insert.
[0020] FIGS. 9a and 9b disclose longitudinal section views of other
embodiments of pick tool assemblies each comprising a body
comprising a cavity fastened to a shank.
[0021] FIG. 10 discloses a perspective view of an embodiment of a
trenching machine comprising a rotatable wheel.
[0022] FIG. 11 discloses an orthogonal view of an embodiment of a
trenching machine comprising a continuous chain.
[0023] FIG. 12 discloses an orthogonal view of an embodiment of a
drill bit.
DETAILED DESCRIPTION OF DRAWINGS
[0024] Referring now to the figures, FIG. 1 discloses an embodiment
of a formation degradation machine in the form of a road milling
machine 100. The road milling machine 100 may travel over a
degradable surface 101 that may be a man-made roadway such as those
comprising pavement, concrete, or asphalt or it may be a naturally
occurring earthen formation. A rotatable drum 102 may be secured to
an underside of the road milling machine 100.
[0025] FIG. 2 discloses the rotatable drum 102 of FIG. 1 comprising
a plurality of pick tools 220 disposed around an exterior thereof.
The rotatable drum 102 may be driven such that the pick tools 220
engage and degrade the degradable surface 101.
[0026] FIG. 3a discloses an embodiment of a pick tool assembly 301.
In the embodiment shown, the pick tool assembly 301 comprises a
shank 302 comprising a forward end 303 and a rearward end 304. The
rearward end 304 of the shank 302 may be adapted for retention in a
bore of a block attached to a driving mechanism such as a rotatable
drum, wheel, continuous chain, or drill bit. A trailing end 305 of
a body 306 may be detachably fastened to the forward end 303 of the
shank 302. The body 306 is unable to rotate with respect to the
shank 302. The body 306 comprises an impact tip 307 permanently
bonded on a leading end 308 of the body 306 opposing the shank
302.
[0027] The body 306 and impact tip 307 may be the most quickly worn
parts in the pick tool assembly 301. Having a shank 302 that is
detachably fastened to the body 306 may be beneficial because it
may allow for the timely replacement of the body 306 and impact tip
307. The shank 302 of the pick tool assembly 301 may last longer
than the body 306 and the impact tip 307 because the shank 302 may
be disposed in the bore of a block and shielded by the body 306.
The shank 302 may still be functional when the body 306 and impact
tip 307 have lost their usefulness. By making the shank 302
removable, the overall tool life of the pick tool assembly 301 may
be increased because the shank 302 may be reused several times
while the body 306 and the impact tip 307 are detached and
replaced. Additionally, the proposed invention may be beneficial
because the body 306 may undergo different treatments or other
finishing operations than the shank 302. This may allow for more
specialized customization of the properties of the shank 302 and
the body 306 and improved performance and wear resistance overall.
For example, the shank 302 may be made from inexpensive steel while
the body 306 may be made from stronger, heat-treated steel. The
body 306 may also be hard-faced with more wear-resistant materials
to improve its life.
[0028] FIG. 3b discloses the pick tool assembly 301 of FIG. 3a. The
impact tip 307 may comprise a superhard material 309, such as
polycrystalline diamond, sintered to a carbide substrate 310 brazed
to a carbide bolster 311. The impact tip 307 may be the first
portion of the pick tool assembly 301 to contact a surface being
degraded by the pick tool assembly 301 and thus may experience
extremely abrasive conditions during use. The body 306 may be the
second portion of the pick tool assembly 301 to contact a surface
being degraded and thus may also experience significant abrasive
conditions. While the impact tip 307 may experience more abrasive
conditions than the body 306, the superior toughness of the
superhard material 309 as compared to the carbide bolster 311 and
of the carbide bolster 311 as compared to the body 306 may cause
more substantial wear on portions of the pick tool assembly 301
further from the superhard material 309. The shank 302 may be
shielded from significant wear by the body 306.
[0029] The body 306 may further comprise one or more detachment
grooves 314 disposed on a flange of the trailing end 305 of the
body 302. The detachment grooves 314 may aid in removal of the body
306 from the shank 302 by allowing a pick removal tool to be
inserted between the body 306 and a block.
[0030] FIG. 3c discloses the pick tool assembly 301 of FIGS. 3a and
3b. The leading end 308 of the body 306 may comprise a recess 315
therein in which the impact tip 307 may be disposed. In the
embodiment shown, the impact tip 307 is brazed to the body 306,
however, it may also be attached by other methods known in the art
such as press-fitting.
[0031] The rearward end 305 of the body 306 may comprise a socket
316 in which the forward end 303 of the shank 302 may be disposed.
The forward end 303 may be press fit within the socket 316. The
forward end 303 may also comprise various features that may aid in
the press fit. In the embodiment shown, the forward end 303
comprises a slot 317 that may aid in the press fit by causing it to
be more pliant. The forward end 303 may also comprise a slight
taper as shown to aid in the press fit.
[0032] FIG. 4 discloses another embodiment of a pick tool assembly
401. The pick tool assembly 401 of this embodiment may comprise a
body 406 comprising a radial flange 425 disposed on a trailing end
405 thereof and a shank 402 comprising an outer shelf 418 disposed
around an exterior of a forward end (hidden) thereof. Contact
between the radial flange 425 and the outer shelf 418 may aid in
transferring forces experienced by the body 406 to the shank
402.
[0033] A detachment groove 424 may be disposed on the outer shelf
418. The detachment groove 424 may aid in removal of the shank 402
from a block by allowing a pick removal tool to be inserted between
the outer shelf 418 and the block.
[0034] FIG. 5 discloses yet another embodiment of a pick tool
assembly 501 with a forward end 503 of a shank 502 press fit within
a socket 516 of a body 506. In the embodiment shown, the forward
end 503 comprises both a slot 517 and a hollow section 519 that may
aid in the press fit by causing the forward end 503 to be more
pliant.
[0035] FIG. 6 discloses an additional embodiment of a pick tool
assembly 601. In this embodiment, a compliant ring 613 is disposed
around a forward end 603 of a shank 602 that may aid in press
fitting the forward end 603 into a socket 616 of a body 606. The
compliant ring 613 may compress when the shank 602 is inserted into
the socket 616 and thereby assist in retaining the body 606 on the
shank 602.
[0036] FIG. 7a discloses a further embodiment of a pick tool
assembly 701 comprising one or more cylindrical pin inserts 720
which may assist in retaining a body 706 on a shank 702. While in
place, the cylindrical pin inserts 720 may prevent the body 706
from detaching from or rotating with respect to the shank 702. The
cylindrical pin inserts 720 may be slid out of place when the body
706 is to be removed from the shank 702.
[0037] FIG. 7b discloses the pick tool assembly 701 of FIG. 7a.
Holes may be drilled through portions of both the shank 702 and the
body 706 allowing for the cylindrical pin inserts 720 to be
inserted therein.
[0038] FIG. 8 discloses another embodiment of a pick tool assembly
801. In this embodiment, one or more square pin inserts 821 may
assist in retaining a body 806 on a shank 802. It is believed that
square pin inserts 821 may be easier to manufacture and install
than other geometries of pin inserts and may thereby be
desirable.
[0039] FIGS. 9a and 9b disclose additional embodiments of pick tool
assemblies 901a and 901b respectively. The pick tool assemblies
901a and 901b each comprise an impact tip 907a, 907b bonded to a
forward end 903a, 903b of a shank 902a, 902b. In the embodiment
shown in FIG. 9a, the impact tip 907a is securely press fit to the
forward end 903a to form the bond, while in the embodiment shown in
FIG. 9b, the impact tip 907b is brazed to the forward end 903b to
form the bond. In both embodiments, a body 906a, 906b comprising a
cavity 926a, 926b passing completely there through is detachably
and nonrotatably fastened to the forward end 903a, 903b. The impact
tip 907a, 907b may extend through the cavity 926a, 926b for
engagement with a formation.
[0040] FIGS. 10, 11 and 12 disclose embodiments of various types of
formation degradation machines each comprising a plurality of pick
tools disposed thereon. The formation degradation machines shown
may be driven such that the pick tools engage and degrade a
degradable surface. For example, FIG. 10 discloses an embodiment of
a formation degradation machine in the form of a trencher 1000. The
trencher 1000 may comprise a rotatable wheel 1002 comprising a
plurality of pick tools 1020 disposed around an exterior thereof.
The pick tools 1020 may engage and degrade a degradable surface
1001 to form a trench when the rotatable wheel 1002 is driven.
[0041] FIG. 11 also discloses an embodiment of a formation
degradation machine in the form of a trencher 1100. The trencher
1100 may comprise a continuous chain 1102 comprising a plurality of
pick tools 1120. The pick tools 1120 may engage and degrade a
degradable surface 1101 to form a trench when the continuous chain
1102 is passed over an exterior of a boom 1132.
[0042] FIG. 12 discloses an embodiment of a formation degradation
machine in the form of a drill bit 1200. A plurality of pick tools
1220 may be disposed on the drill bit 1200 that may engage and
degrade a degradable surface (not shown) when the drill bit 1200 is
rotated.
[0043] Whereas the present invention has been described in
particular relation to the drawings attached hereto, it should be
understood that other and further modifications apart from those
shown or suggested herein, may be made within the scope and spirit
of the present invention.
* * * * *