U.S. patent application number 11/452494 was filed with the patent office on 2007-01-11 for mine roof cable bolt and method.
This patent application is currently assigned to F. M. Locotos Co., Inc.. Invention is credited to Frank M. Locotos.
Application Number | 20070009330 11/452494 |
Document ID | / |
Family ID | 39343602 |
Filed Date | 2007-01-11 |
United States Patent
Application |
20070009330 |
Kind Code |
A1 |
Locotos; Frank M. |
January 11, 2007 |
Mine roof cable bolt and method
Abstract
A mine roof bolt for use with resin including a strand cable.
The bolt includes a head mechanism attached to the strand cable
which preferably allows the strand cable to be turned in a first
direction for mixing the resin and in a second direction opposite
the first direction for tensioning the strand cable in the mine
roof; although mixing and tightening can occur in the same
direction. A method for placing a mine roof bolt in a mine
roof.
Inventors: |
Locotos; Frank M.;
(Bridgeville, PA) |
Correspondence
Address: |
Ansel M. Schwartz;Attorney at Law
Suite 304
201 N. Craig Street
Pittsburgh
PA
15213
US
|
Assignee: |
F. M. Locotos Co., Inc.
|
Family ID: |
39343602 |
Appl. No.: |
11/452494 |
Filed: |
June 14, 2006 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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60691664 |
Jun 17, 2005 |
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Current U.S.
Class: |
405/259.5 |
Current CPC
Class: |
E21D 21/006 20160101;
E21D 20/025 20130101 |
Class at
Publication: |
405/259.5 |
International
Class: |
E21D 20/00 20060101
E21D020/00 |
Claims
1. A mine roof bolt for use in a bore hole of a mine with resin
comprising: a strand cable; and a head mechanism attached to the
strand cable which allows the strand cable to be turned in a first
direction for mixing the resin and in a second direction opposite
the first direction for tensioning the strand cable in the mine
roof.
2. A bolt as described in claim 1 wherein the head mechanism
includes a hollow fixture threaded on the outside through which the
cable extends and to which the cable is attached.
3. A bolt as described in claim 2 wherein the head mechanism
includes a nut threaded to the fixture.
4. A bolt as described in claim 3 wherein the fixture has a bottom
portion which is beveled internally.
5. A bolt as described in claim 4 wherein the head mechanism
includes wedges which are disposed in the beveled portion to grip
the cable.
6. A bolt as described in claim 5 wherein the fixture has an upper
end which is swaged to the cable.
7. A bolt as described in claim 6 wherein the head mechanism
includes a stop mechanism disposed between the end of the fixture
and the wedges to prevent the nut from coming off as the fixture is
spun backwards opposite of its threads to cause the cable to mix
the resin.
8. A mine roof bolt for use with resin comprising: a strand cable;
and means for allowing the strand cable to be turned in a first
direction for mixing the resin and in a second direction opposite
the first direction for tensioning the strand cable in the mine
roof.
9. A method for placing a mine roof bolt in a mine roof comprising
the steps of: placing a resin cartridge in a bore hole in the mine
roof; inserting the strand cable of the bolt into the borehole so
it pierces the cartridge; rotating a head mechanism of the bolt
attached to the strand cable in a first direction to rotate the
strand cable and mix the resin; and rotating the head mechanism in
a second direction opposite the first direction to tension the
cable bolt in the mine roof.
10. A method as described in claim 9 including the step of spinning
the fixture of the head mechanism in a direction opposite of
threads on the fixture.
11. A method as described in claim 10 wherein the spinning step
includes the step of preventing a nut of the head mechanism from
coming off with a stop mechanism of the head mechanism.
12. A method as described in claim 11 wherein the rotating in a
second direction step includes the step of turning the nut in the
second direction after the resin has set to tension the bolt.
13. A mine roof bolt for use in a bore hole of a mine with resin
comprising: a strand cable; and a head mechanism attached to the
strand cable, the head mechanism includes a hollow fixture made
from hot rolled all thread bar threaded on the outside through
which the cable extends and to which the cable is attached, and a
nut threaded to the fixture.
14. A bolt as described in claim 13 wherein the fixture has a
bottom portion which is beveled internally.
15. A bolt as described in claim 14 wherein the head mechanism
includes wedges which are disposed in the beveled portion to grip
the cable.
16. A method for placing a mine roof bolt in a mine roof comprising
the steps of: placing a resin cartridge in a bore hole in the mine
roof; inserting the strand cable of the bolt into the bore hole so
it pierces the cartridge; rotating a head mechanism of the bolt
attached to the strand cable in a first direction to rotate the
strand cable and mix the resin; stopping the rotation of the head
mechanism; and rotating the head mechanism in the first direction
to tension the cable bolt in the mine roof.
Description
FIELD OF THE INVENTION
[0001] The present invention is related to a mine roof bolt. More
specifically, the present invention is related to a mine roof bolt
for use with resin that comprises a multi strand cable that is
preferably spun in a first direction for mixing the resin and in a
second direction opposite the first direction to tension the cable,
although spinning in the same direction for mixing and tensioning
can also be used.
BACKGROUND OF THE INVENTION
[0002] In regard to the prior art using rigid tension rebar bolts,
the method to mix the resin was by turning in one direction to mix,
then the opposite direction to tension the system. The prior art
teaches several stop mechanisms which are different.
[0003] U.S. Pat. No. 5,378,087--This patent has to do with straight
insertion using a static mixer on top. No spinning or turning to
mix resin.
[0004] U.S. Pat. No. 6,039,509--This patent teaches a method for
mixing by turning the cable, however, it doesn't say turning one
way first to mix resin, then the opposite way to tension.
[0005] U.S. Pat. Nos. 5,375,946 and 5,647,694--These patents mix
and tension in one direction simultaneously. They are different in
that they both use an expansion shell at the top of bolt.
[0006] Previous Methods to Mix Resin Using Stiff Rebar Inclused:
[0007] 1. Delay nuts--such as a dome nut, shear-pin nut, and a
tab-nut which prevents the thread from moving through the nut
during mixing, all of these had mixing and tensioning occurring
with movement of the tensioning device in one direction. [0008] 2.
McDowell System--uses mixing in one direction and then tensioning
in the other direction. The means to prevent movement of the nut
off the thread is by damaging the thread at the end of the bolt.
[0009] 3. Jim Earl System--uses a one-half nut welded at the end of
the threads of a rebar as a stop means during mixing backwards,
similar to McDowell.
BRIEF SUMMARY OF THE INVENTION
[0010] The present invention pertains to a mine roof bolt for use
with resin. The bolt comprises a strand cable. The bolt comprises a
head mechanism attached to the strand cable which allows the strand
cable to be turned in a first direction for mixing the resin and in
a second direction opposite the first direction for tensioning the
strand cable in the mine roof.
[0011] The present invention pertains to a mine roof bolt for use
with resin. The bolt comprises a strand cable. The bolt comprises
means for allowing the strand cable to be turned in a first
direction for mixing the resin and in a second direction opposite
the first direction for tensioning the strand cable in the mine
roof.
[0012] The present invention pertains to a method for placing a
mine roof bolt in a mine roof. The method comprises the steps of
placing a resin cartridge in a bore hole in the mine roof. There is
the step of inserting the strand cable of the bolt into the
borehole so it pierces the cartridge. There is the step of rotating
a head mechanism of the bolt attached to the strand cable in a
first direction to rotate the strand cable and mix the resin. There
is the step of rotating the head mechanism in a second direction
opposite the first direction to tension the cable bolt in the mine
roof.
[0013] The present invention is a mine roof bolt for use in a bore
hole of a mine with resin. The bolt comprises a strand cable. The
bolt comprises a head mechanism attached to the strand cable. The
head mechanism includes a hollow fixture made from hot rolled all
thread bar threaded on the outside through which the cable extends
and to which the cable is attached, and a nut threaded to the
fixture.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
[0014] In the accompanying drawings, the preferred embodiment of
the invention and preferred methods of practicing the invention are
illustrated in which:
[0015] FIG. 1 is a schematic representation of a mine roof bolt of
the present invention.
[0016] FIG. 2 is a schematic representation of a bottom end of a
mine roof bolt of the present invention.
[0017] FIG. 3 is a schematic representation of an invention tool
with a mine roof bolt of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0018] Referring now to the drawings wherein like reference
numerals refer to similar or identical parts throughout the several
views, and more specifically to FIGS. 1-3 thereof, there is shown a
mine roof bolt for use with resin. The bolt comprises a strand
cable. The bolt comprises a head mechanism attached to the strand
cable which allows the strand cable to be turned in a first
direction for mixing the resin and in a second direction opposite
the first direction for tensioning the strand cable in the mine
roof.
[0019] Preferably, the head mechanism includes a hollow fixture 4
threaded on the outside through which the cable extends and to
which the cable is attached. The fixture is preferably made from
hot rolled all thread bar, described in ASTM A615, incorporated by
reference herein. The head mechanism preferably includes a nut 5
threaded to the fixture 4. Preferably, the fixture 4 has a bottom
portion which is beveled internally.
[0020] The head mechanism preferably includes wedges 7 which are
disposed in the beveled portion to grip the cable. Preferably, the
fixture 4 has an upper end 15 which is swagged to the cable,
although it does not have to be swagged. The head mechanism
preferably includes a stop mechanism disposed between the end of
the fixture 4 and the wedges 7 to prevent the nut 5 from coming off
as the fixture 4 is spun backwards opposite of its threads to cause
the cable to mix the resin.
[0021] The present invention pertains to a mine roof bolt for use
with resin. The bolt comprises a strand cable. The bolt comprises
means for allowing the strand cable to be turned in a first
direction for mixing the resin and in a second direction opposite
the first direction for tensioning the strand cable in the mine
roof.
[0022] The allowing means is shown in FIGS. 1-3.
[0023] The present invention pertains to a method for placing a
mine roof bolt in a mine roof. The method comprises the steps of
placing a resin cartridge 3 in a bore hole in the mine roof. There
is the step of inserting the strand cable of the bolt into the
borehole so it pierces the cartridge. There is the step of rotating
a head mechanism of the bolt attached to the strand cable in a
first direction to rotate the strand cable and mix the resin. There
is the step of rotating the head mechanism in a second direction
opposite the first direction to tension the cable bolt in the mine
roof.
[0024] Preferably, there is the step of spinning the fixture 4 of
the head mechanism in a direction opposite of threads on the
fixture 4. The spinning step preferably includes the step of
preventing a nut 5 of the head mechanism from coming off with a
stop mechanism of the head mechanism. Preferably, the rotating in a
second direction step includes the step of turning the nut 5 in the
second direction after the resin has set to tension the bolt.
[0025] The present invention includes a method to install a cable
bolt with tension. It also has specific hardware (a stop washer 6)
and the manner in which it is placed.
[0026] The method preferably is to mix in one direction and tension
in the opposite direction using a cable bolt.
[0027] The present invention is a mine roof bolt for use in a bore
hole of a mine with resin. The bolt comprises a strand cable. The
bolt comprises a head mechanism attached to the strand cable. The
head mechanism includes a hollow fixture made from hot rolled all
thread bar threaded on the outside through which the cable extends
and to which the cable is attached, and a nut threaded to the
fixture.
[0028] Preferably, the fixture has a bottom portion which is
beveled internally. The head mechanism preferably includes wedges
which are disposed in the beveled portion to grip the cable.
[0029] The present invention pertains to a method for placing a
mine roof bolt in a mine roof. The method comprises the steps of
placing a resin cartridge in a bore hole in the mine roof. There is
the step of inserting the strand cable of the bolt into the
borehole so it pierces the cartridge. There is the step of rotating
a head mechanism of the bolt attached to the strand cable in a
first direction to rotate the strand cable and mix the resin. There
is the step of stopping the rotation of the head mechanism. There
is the step of rotating the head mechanism in the first direction
to tension the cable bolt in the mine roof. Preferably, the
stopping step lasts long enough for the mixed resin to set.
[0030] In the operation of the preferred embodiment, the bolt has a
stop washer 6 that prevents the nut 5 from coming off during
mixing. This washer 6 is held in place by the action of the wedges
7 seating inside the end of the fixture 4. The washer I.D. is the
same or slightly larger than the diameter of the entrance to the
fixture 4. Since the wedges 7 are tapered and become larger than
the entrance diameter and washer I.D., this interference fit holds
the washer in place. A roof bolting machine attaches to the
insertion tool to spin and tension the bolt, as shown in FIG.
3.
[0031] In the prior art, shown on rigid rebar, the stop mechanism
is different, either by: 1) damaging the threads at the end; or, 2)
by fixing a thin nut on the end of the threads the main nut is
prevented from coming off during mixing in the opposite
direction.
[0032] A multi-strand cable 1 with any of several means of mixing
resin 9 in a cartridge 3 attached to the leading end is inserted
into a drilled hole 10 in the roof of a mine or tunnel containing
the resin. The second or bottom end has a fixture 4 attached to the
cable which is threaded on the outside and has a nut 5 threaded to
it. A drilled out threaded rebar rod is used as a fixture 4 to hold
the cable. These threads 35 on the rebar are manufactured during
rolling of the rod in a steel mill versus cut or roll threading a
round rod. Examples could be a Dywidag or SAS rod. These threads 35
of a hot rolled all thread bar are better than rolled or cut
threads since they do not damage in rough handling in a mine. The
threaded fixture 4 is hollow and accepts the strand cable 1. The
head mechanism could also be a casting made in a foundry.
[0033] The bottom portion of the fixture 4 is beveled internally to
accept wedges 7 which grip the swagged mechanically to the cable. A
washer 6 (preferably round) is placed as a stop member between the
end of the fixture 4 and the wedges 7. The washer can be held by
the wedges 7 as an interference fit (between wedges 7 and end of
all thread bar-fixture 4), or can be attached to the end of the
fixture 4, such as welding to hold it on. The washer provides a
flat surface 16 to contact the nut 5 face as a stop means. This may
be held in several other means such as welding to the fixture 4. A
deep wall socket 13 is used to insert the bolt and spin the resin.
The stop washer 6 prevents the nut 5 from coming off as the bolt is
spun backwards (opposite of its threads) to mix the resin. After
spinning backwards to mix resin, the bolt is held in place until
the resin sets, then the nut 5 is turned the other direction to
tension the bolt from the nut 5 to the resin anchorage zone.
[0034] If it is desired to mix and tighten in the same direction,
this can be accomplished for example by using U.S. Pat. No.
5,526,720, incorporated by reference herein, which features a
spring loaded wrench to allow both mix spinning and tightening to
occur in one direction. When mixing and tightening in the same
direction, a stop mechanism does not have to be used.
[0035] Although the invention has been described in detail in the
foregoing embodiments for the purpose of illustration, it is to be
understood that such detail is solely for that purpose and that
variations can be made therein by those skilled in the art without
departing from the spirit and scope of the invention except as it
may be described by the following claims.
* * * * *