Core-Drill. Page: 3 of 3
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929,780
Having thus described our invention, what
we esteem as new, and desire to secure by
Letters Paten of the United Statess
. In a core drill, adrillhead having ase-.
ries of recesses formed in the lMwer end there-
of, cutter;shaftsmounted in said recesses, an
inner series of small cutters on oneend and
anouter series of larger-cutters on the other
end of some f said shafts, and an intermedi-
ate-series of singlecutters on the other shafts
arpanrgedto cut between the cuts oft dou-
ble cutters, and a cap plate retaining the cut-
ter shafts and forming the lower bearings
therefore.
15 :2 :n combination ith a tubular drill
head having means for engaging the corea
bi ormed on the lowver nd thereof, aid bit
cons itin o drillhead having aseieso
radially sposed recesses formed inthelower
20 end thereof, shafts ournaled in said recesses
said shaftscarrying alternately y;double and
singlecutters, the double cuttersbeing ar-
rangedoneat each end.oftheshaft> ande
sig le cutters being disposed intermedit
25 the length of:their=shafts, a cap plate having
recesses saidecesses=formingthe ower
bearings for the shafts of the single and dour
ble cutters and nmeans for.securing the cap
plate to the tubularhead.
30 3. core drill c nsisting of the tubularhead containing core grasping neans, said
head having recesses formed in the lower end
thereof, a series-of double and singleserrated
conical cutters alternately placed in.said re-
'cesses, shafts for said cutters a perforated :
cap plate engaging the shafts of4the cutters
to retain themin position, said peforations
permitting the projection of the cutter faces,
and means for holnt capplate upon the
lower end of he drilllied.
4 In.combinationnith a tubular drill
head ovided-in its lower end with a series of
radialy sposed recesses, shafts mounted in
certainof the.recesses and carryig a sees o
small cutters at.theirinner ends and aseries:4
of larger cutters at their outer ends and
shafts mounted in the recessesbetween the
shafts carryingthe doublecuttersand carry
ing a series of central disposedcuttersand
acapplate formed wit recesses forming the.5t
lowertearn forallofsaidshaftn andse-
cured to the ower portion f the drill head.
In testimony-whereof wefx our sign-
tures ini presence of two winesses,
MALACHA4.MLOT LJI
JOIEN S .-WYNN. --
Wit esses:_.
HARRY THOMSoN.
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McLoughlin, Malacha J. & Wynn, John S. Core-Drill., patent, August 3, 1909; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth511570/m1/3/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.