Disk Plow. Page: 2 of 3
[1], 2 p. : ill. ; 23 cm.View a full description of this patent.
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UNITED STATES PATENT OFFICE.
GEORGE L. HOFFMAN, OF PLAINVIEW, TEXAS.
DISK PLOW.Specification of Letters Patent.
Patented Nov. 4, 1919.
Application filed September 19, 1917. Serial No. 192,073.
To all whom it may concern
Be it known that I, GEoRGE L. HoFFMAN,
a citizen of the United 'States, residing at
Plainview, Texas, have invented a new and
5 useful Improvement in Disk Plows, of which
the following is a specification.
My invention relates to disk plows hav-
ing soil turning disks, and the objects of
my improvements are to so form the turning
10 disk as to give it flexibility during action
and permit a longer portion of its edge to
contact with the face of the cutting disk
and under a yielding pressure;- to form the
turning disk so that it becomes self sharp-
15 ened by contact with the face of the cutting
disk; to form the turning disk for automati-
cally releasing the accumulated trash. These
objects together with others which may be
incorporated in the claims may be attained
20 in the following described manner as illus-
trated in the accompanying drawings,, in
which:
Figure 1 is the plan of a disk plow pro-
vided with my improvements; Fig. "2 a
25 front elevation with parts in vertical sec-
tion through the axial plane of the respec-
tive disks; Figs. 3 and 4 a front elevation
and diametrical.section respectively of the
sectional soil turning disk, and Fig. 5 a de-.
30 tail showing an adjustment of the bracket'
with the turning disk in the plane of the
cutting disk.
In the drawings, 1 represents the beam
of a disk plow, 2 the concavo-convex cutting
35 disk, 3 the hitch, 4 the land wheel, 5 and 6
respective front and rear furrow wheels,
and 7 the seat, all being constructed and
arranged in the ordinary manner.
The arm 8 formed on the bearing 9 and
40 thereby secured to the beam is curved paral-
lel with the adjacent surface of the cutting
disk journaled in said bearing, and the simi-
larly curved standard 11 is formed with the
slot 12 whereby it may be extensibly secured
45 on said arm by means of the bolts 13. The
angular bracket ~14 formed with the slot
15 and with the transverse fulcrum 16 may
be secured on the standard by means of the
clamping bolt 17 whereon it is also pivotally
50 adjustable as shown in Fig. 5. The set
screws 18 serve to adjust the bracket in dif-
ferent vertical angles to the adjacent face
of the standard on the fulcrum 16 as shown
in Fig. 2. The bifurcated yoke 21 secured
55 on the bracket by means of the bolt 22 being
inserted through the slot 15 is thereby ad-justable longitudinally in said slot and also
rotatively on said 'bolt. The soil turning
disk 23 preferably concavo-convex in form
is secured on the axial shaft 24 by means 60
of the nut 25. Said shaft is journaled at
its ends in the respective legs of the yoke 21
as shown in Fig. 2. The double bearings for
said shaft serve to maintain the disk thereon
in adjusted position to turn in the yoke in 65
the proper plane even if the bearings do
become worn, which is not possible where
a rear bearing only is used.
The metal wire brush 26 may be adjust-
ably secured on the yoke as shown in Fig. 2 70
for automatically cleaning the face of the
turning disk from any accumulation of trash
or soil thereon. The turning disk 23 may
consist of a series of radiating sections 30
of thin resilient metal secured to their coin- 75
mon hub 27 bye means of the respective
screws 28 as shown in Figs. 3 and 4. The
adjacent edges of said sections may be cut
away from a short distance back of their
cutting' edge to the tub to form radial slots 80
29 for automatically releasing any trash
that may get between them. A narrow por-
tion 31 of the edge of the turning disk may
.be curved in a rearward direction to its
concavity or reversely bowed as shown in 5
Figs. 2 and 4, thereby providing a beveled
peripheral edge which is self sharpening by
continuous engagement with the face of the
cutting disk and is more efficient in scraping
the soil therefrom. A narrow portion 32 of 90
the edge of the cutting disk may in like
manner be curved in a rearward direction as
shown in Fig. 2 for increasing its efficiency
for use in hard dry soil by automatically
retaining its proper depth therein. 95
In operation, the long shaft of the turn-
ing disk being journaled at its ends in the
respective legs of the yoke, maintains the
disk in the same plane in relation to the
yoke and prevents it from getting out of i00
line from wear as is so universally the case
when the shaft is suppported at one end
only and in a single bearing. By means of
the yoke the turning disk therein may be
adjusted on the bracket in different distance 105
relations to the face of the cutting disk and
also in different horizontal angles thereon.
The micrometer adjustment of the bracket
on the standard, as shown in Figs. 2 and 5,
serves to adjust the turning disk with its 110
plane in different vertical angles and also
in a plane substantially parallel to the ad-1,321,040.
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Hoffman, George L. Disk Plow., patent, November 4, 1919; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1256382/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.