Post Hole Auger. Page: 2 of 3
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UNITED STATES PATENT OFFICE0
FRED. GRIMM, OF COMANCHE, TEXAS.
POST-HOLE AUGER.
SPECIFICATION forming part of Letters Patent No. 330,580, dated November 17, 1885.
Application filed June 17, 1885. Serial No. 168.981. (No model.)
To all zhon it may concern: with elongated slots c, and engaging said
Be it known that I, FRED. GxRIMM, a citi- slots are bolts d, the upper threaded ends of
zen of the United States, residing at Coman- which pass through openings ein the wings C.
che, in the county of Comanche and State of Engaging the threaded upper ends of the bolts
5 Texas, have invented a new and useful Im- are nuts which clamp the bolts in place to hold 55
provement in Post-Hole Augers, of which the the blades in their proper position at any de-
following is a specification, reference being sired adjustment. It will be seen that by
had to the accompanying drawings. loosening the nuts the blades may be moved
My invention relates to post-hole augers, in the slots and secured at any desired ad-
9o the object being to provide the same with an justment to bore holes of different sizes. The 6o
improved construction of blade, and means lower ends of the cutting knives or blades
for adjusting the blades composing the auger, are turned inwardly at their lower ends, as
whereby different sizes of post-holes may be shown, toward a common center. Their cut-
bored. ting-edges f extend vertically for about two-
15 With these ends in view the invention con- thirds of their length, extending from their 65
sists, first, in an improved construction of upper ends, and near their lower ends the
blade; second, in the means for adjusting and knives are turned outwardly, so that said
securing the same, and in the details of con- cutting-edges will project beyond the rear or
struction and combinations of parts herein- blunt edge g of the adjacent cutter. By turn-
20 after fully described, and pointed out in the ing the lower ends of the cutting knives or 70
claim. blades inwardly the cutting-edges come in
In the drawings, Figure 1 is a perspective contact with the ground as well as the points,
view of a post-hole auger constructed in ac- so that a hole may be readily and quickly
cordance with my invention. Fig. 2 is a bot- bored."
25 tom view. Fig. 3 is a section on the line x x If desired, the wings C might be made 75
of Fig. 2, and Fig. 4 is a transverse section on slightly convex, and the arms on the cutting-
the line y y of Fig. 3. knives of a corresponding shape, so that when
In the accompanying drawings, in which the knives were adjusted to their fullest ex-
like letters of reference indicate correspond- tent they would not be so liable to be bent or
30 ing parts in all the figures, A represents a broken. 80
head or plate, which is provided with a cen- In order to define the nature and scope of
trally-located rectangular opening, a, adapted my invention, I would state that heretofore it
to receive a handle for operating the device. has been proposed to provide a post-hole
The head-plate A is provided with a series of borer with a head-piece having vertical or
35 outwardly-extending wings, C, in this case slightly-inclined faces and grooves, in which 85
three, to receive three of the cutting-blades, are fitted the bent slotted ends of adjustable
It will be seen, however, that, if desired, four cutting-blades, which are curved longitudi-
of these wings could be employed. Thewings nally and bent to bring them to a common
C are provided with downwardly extending center. My invention differs from these con-
40 side flanges, D, which are adapted to serve structions, in the fact that my operating-han- 90o
as guides and to hold the upper ends of the dle has a number of horizontal radial wings,
cutting-bladesEin place. -Thecutting-blades which are provided on their under surface
E are formed with the pointed lower ends, with ledges or flanges, between which are
a', in order that they may readily penetrate fitted the horizontal slotted arms of cutting-
45 or enter the ground. The upper ends of the blades held adjustably by bolts and nuts. The 95
cutting blades or knives are formed with in- lower ends of my cutting-blades are bent or
wardly- extending arms, which fit between curved inwardly and transversely, tobring the
the downwardly -extending flanges of the cutting-edges of points out of the plane of
wings C, which wings hold the blades against rotation of the blunt rear edge of the preced-
50 lateral movement. The arms are provided ing cutting-blade, to obviate the danger of ioo
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Grimm, Frederick. Post Hole Auger., patent, November 17, 1885; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth171130/m1/2/: accessed April 19, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.