A new solution for an old problem…. Does your mine have this problem? If it does, you need to get the Ker <>< Thob implemented into your roof control plan!. Ker <>< Thobs can be put directly over beltlines. Ker <>< Thob Application & Installation Process.
for an old problem…
this problem? If it
does, you need to get
your roof control
Any steel pipe, stronger than the roof bolt can be used with the Ker<><Thob, as long as it’s inside diameter is between (2.125 to 2.6 inches for our 2 1/8 inch unit) or (2.25 to 3 inches for our 2 1/4 inch unit).
One miner can carry a temporary roof jack, a shoulder bag containing a few Ker<><Thobs, two channel locks, and a selection of pipe cut to different lengths. This is all that is needed to allow one man to repair several loosened roof bolt plates.
Install temporary supports! Do not work under unsupported roof.
roof plate up to
the roof and
distance from the
plate to the flange
of the bolt head.
Subtract two inches from the measurement to get the correct length of pipe needed to be used with the Ker<><Thob. (5”– 2” = 3”) pipe length needed
Ker<><Thob onto the flange of the bolt head.
Make sure that the notched ends of the split halves are resting on the flange of the bolt head!
pipe over the
bolt head and
the split halves.
Start the nut up over the bolt head and thread onto the split halves.
Push the spacer pipe against the split halves to aid in the threading of the nut onto the unit.
Two Channellock Pliers (one 420 and one 460), and a tape measure are the only tools needed for the installation of a Ker<><Thob!
The Ker<><Thob was tested by MSHA on 10/3/96 and 9/3/97. Both times it was subjected up to 60,800 pounds of pressure with no failure.
Mailing Address: Ker<><Thob Inc.
P.O. Box 317
Norris City, IL 62869
CONSOLIDATION COAL CO. (REND LAKE, 2186 NORTH KEYSTONE LANE / NASON, IL. 62886)
DAKOTA MINE (Rt 85 / BOBWHITE, WV. 25028)
EASTERN ASSOCIATED COAL CORP. (HARRIS MINE ,ROUTE 85 / BALD KNOB, WV. 25010-0085)
PINE RIDGE COAL COMPANY (PO BOX 104, STATE RT. 5 / PRENTER, WV. 25181-0104)
TRIAD MINING (RT 1-HC70, LAUREL LAKE ROAD / LENORE, WV 25676)
TRIUNE INC. (2328 I-70 FRONTAGE ROAD / GRAND JUNCTION, CO. 81505)
UNITED CENTRAL SUPPLY (1800 SUPPLY ROAD / CARTERVILLE, IL. 62918)
WABASH MINE HOLDING CO. (7534 N. 900 BLVD. / KEENSBURG, IL. 62852-0144)
ARCH IL, CONAN MINE (PICKNEYVILLE, IL)
BANKS MILLER SUPPLY CO. (14731 HWY 40 W. / TOMAHAWK, KY)
BLACK BEAUTY UNDERGROUND, INC. (AIR QUALITY #1, P.O. BOX 176 / WHEATLAND, IN)
PEN COAL CORP. (ROUTE 1, McCOMAS ROAD / DUNLOW, WV 25511)
MARFORK COAL CO. (ROUTE 3, MARFORK ROAD / PETTUS, WV 25209)
NATIONAL MINE SUPPLY (451 RAGLAND ROAD / BECKLEY, WV 25801)
PHILLIPI DEVELOPMET CO. (RT. 3, BOX 146 / PHILLIPI, WV 26416)
TALL TIMBER COAL CO. (P.O. BOX 722 / MATEWAN, WV 25678)
TURRIS COAL CO. (P.O. BOX 21 / ELKHART, IL 62634)
WHITE COUNTY COAL CORP. (P.O. BOX 457 / CARMI, IL 62821)
BILL MOORE ASSOCIATES (6246 CAROLYN DR. / MENTOR, OH 44060)
SOLAR SOURCES, MONROE CITY MINE (P.O. BOX 325 / MONROE CITY, IN 47577)
ELK RUN COAL CO., WHITE KNIGHT MINE (P.O. BOX 497 / SYLVESTER, WV 25193)
BOONES RESOURCES, INC (P.O. BOX 1056 / PELHAM, AL 35124)
FREEMAN UNITED (P.O. BOX 347, IL RT. 4 / VIRDEN, IL 62960)
THE AMERICAN COAL CO. (9085 HIGHWAY 34 NORTH / GALATIA, IL 62935)