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Патент USA US2406500

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‘Aug. 27, 1946.
e. E. KARL
Filed Dec. 4, 1944
2 Sheets-Sheet 1
' @aol'ge EYZ'arZ
‘ Aug. 27, 1940.
G. E. KARL '
Filed Dec. 4',- 1944
2 sheets-sheet 2
xmi mlmu.
Patented Aug. 27, 1946
George E. KarL'Liberty, Ind., assignor to General
Implement Corporation, Cleveland, Ohio, a
corporation of Ohio
Application December 4, 1944, Serial No. 566,428
2 Claims. (01. 97-216)
This invention relates to farm implements of
the rotary hoe type especially suitable for use
wheel, taken-substantially as indicated at line
in breaking up, loosening and cultivating the soil.
Implements of this general type are usually made
Figure 3 is a fragmentary sectional view
up of a plurality of toothed wheels, disposed in
suitably spaced apart relationship to each other,
2-2 on Figure 1.
through the outer marginal portion of the wheel,
taken substantially as indicated at line 3-3 on
Figure 1.
depending on the particular use of the implement
or the character of the soil in which it is to op
erate. More particularly, the present invention
is directed to improvements in toothed wheels of
rotary hoes in which the wheels are provided with
removable and replaceable teeth of the doubie
pronged type having an anchorage portion of gen
loosely in a desired spaced apart relation on a
erally U-shaped formation.
shaft, to constitute a single unit. For certain
Figure 4 is an inner face view of one of the
plates of the wheel and showing one of the double
pronged teeth seated in position on the plate.
In implements of the type embodying the pres
ent invention it is the usual practice to‘ utilize
a plurality of individual toothed wheels, mounted
Wheels of rotary hoes as heretofore produced.
uses more than one unit consisting of a desired
include two plates or disc-like elements between
which the pronged teeth are rigidly anchored, and
these plates are formed as castings. As is Well
number of individual wheels may be employed,
known, castings possess the undesirable charac
teristic of being fragile, and may readily break
under severe stress or strain when subjected to
rugged usage. Rotary hoe wheels heretofore
and if desired the wheels of one unit may be dis-v
posed in overlapping or offset relation to the
wheels of an adjacent unit.
The wheel embodying the present invention, as
represented in the drawings, includes two identi
cal plates iii, of generally circular contour,
adapted to be disposed in cooperating relation
made with cast plates are relatively heavy and
for embracing therebetween a plurality of cir
furthermore when the pro-nged teeth are mount
cumferentially spaced apart, outwardly project
ed in place therebetween, great care must be ex
ing double pronged teeth I l. The teeth each in
ercised to avoid the possibility of imposing ex
clude a generally U-shaped anchorage portion
cessive strain in tightening the bolts so as to
Ha, adapted to be ?rmly and rigidly clamped in
avoid possibility of fracture or breakage of either
position between the plates when the latter are
or both of the plates.
30 ?xedly connected together by a plurality of cir
One of the objects of this invention is to pro
cumferentially spaced apartbolts i2.
vide an improved toothed wheel of a rotary hoe,
Each of said plates is formed as a unitary sheet
characterized by the provision of a relatively light
metal stamping, and the inner face of each plate
weight durable construction which permits effect
as clearly seen in Figure 4 of the drawings, is
ing a substantial reduction in cost of manufac
formed with a plurality of circumferentially
spaced apart, outwardly opening, U-shaped
Another object is to providev an improved
grooves I4 which constitute mounting seats for
toothed wheel of a rotary hoe wherein said wheel
the anchorage portions i la of the double pronged
comprises a pair of stamped sheet metal plates,
constructed and arranged to rigidly support 40 teeth H. The grooves I4, as may be clearly seen
in Figure 2, are substantially V-shape in cross
therebetween a plurality of circumferentially
section and the grooves of the two'cooperating
spaced apart, outwardly projecting, double
plates are adapted to be aligned with each other
pronged teeth and providing a rugged and durable
and form complementary seats for opposite sides
construction capable of withstanding severe
of the anchorage portions Ila of the double
45 pronged teeth. When the cross section of metal
With these and other objects in view my in
of the legs of the anchorage portion is of diamond
vention consists in the construction, arrangement
shape, such as seen in Figure 2, the opposite cor
and combination of the various parts of my de
ners of the legs are adapted to seat ?rmly and
vice whereby the objects contemplated are at
tained as hereinafter more fully set forth, pointed 50 snugly in the grooves I 4. Said grooves are of
such contour, however, as to readily accommodate
out in the claims and illustrated in the accom
teeth of various cross sectional forms, such as
panying drawings, wherein:
circular, oval, etc.
Figure 1 is a plan view of the improved wheel
The plates are each formed with correspond
of a rotary hoe, embodying the present invention.
ingly positioned apertures l6, for accommodation
Figure 2 is a transverse section through the 55 of the bolts I2, and said apertures are preferably
It will bejapparent, that by virtue of the novel
construction embodying the present invention, in
located within the areas encompassed by the
1 grooves It, as may be seen in Figure 4. Surround
‘ ing each of the apertures l6, on the outer face of
each plate, is an outwardly projecting boss l1,
addition to obtaining the advantages of quick and
easy replacement of damaged or worn teeth, the
wheel per se is of relatively light weight, low in
manufacturing cost, and possesses the important
advantage of increased strength and adaptability
‘ providing seats for the heads or the nuts of the '
‘ bolts, to provide maximum convenience in ap
‘plying or removing the bolts and serving to
for rugged usage without readily becoming dam
, Strengthen and stiffen the plates to reduce the
' ‘
possibility of spring of the plates when they are
Some changes may be made in the construction
3 assembled and the bolts are tightened. When the
7’ and arrangement of the parts of my device with
‘ two plates ID are assembled together, with the
V out departing from the real spirit and purpose of
‘ teeth ii interposed
my invention, and it is my intention to cover by
j is then rigidly connected together by means'of the _ . my claims any modi?ed forms of structure or use
‘‘ bolts I2. The teeth ii are’ thus
rigidly a?ixed
15 ‘of mechanical equivalents which may be reason- '
, with respect to the two plates. 7
ably included within their scope without sacri?c
It will be apparent that if it becomes necessary
ing'?anytof the advantages thereof.
‘ to replaceone or more of the teethyofthe vas
, sembled wheel, it merely requires the removal’ of I ,
; the bolts. [2 to separate the
1 such replacement.
plates and'permit
‘ 'I claim 'as my invention:
1.. In a rotary hoe of the type comprising one
20 or more wheels each composed of a pair of cooper-r
ating plates and a plurality of circumferentially
spaced apart, outwardly projecting, double
pronged teeth each having a U-shaped anchorage
j circumferentially spaced apart, tapered projec
portion clamped ?rmly between said plates, to
} tions l9, located in such relation so as to be dis 25 gether with bolts for-securely connecting said
‘ posed between each of a pair of adjacent legs
plates together; the improvement which com
of the teeth ll. When the plates are assem- ,
prisesa pair of plates having aplurality of sets
‘ bled together with the
Extending outwardly from the outer marginal ‘
1 portion of each of the plates, area plurality. of
of circumferentially spaced apart, complemen
‘ alignment, each set of projections function as
tary U-shaped grooves to constitute seats for the
stone eliminators to preclude wedging 0t stones
anchorage portion of said teeth, said plates hav
or other objects between adjacent prongs of,the
ing a plurality of sets of aligned, outwardly vex
teeth ‘which might result in deformation of the
tending projections, disposed intermediate the
teeth. 7
> The marginal portion of each of the plates, ‘
legs of each of said grooves, and the outer mar
ginal edge of each plate, intermediate adjacent
with a laterally projecting ?ange portionw2l. As 35 projections, terminating in laterally extending
intermediate adjacent projections I9, is formed
may be seen in Figure 1, these ?ange portions ex- '
‘ tend at opposite ends for a substantial portion of ‘
the length of the sides of each of the two adja
cent projections 19.
Said ?anges serve to rein- '
2. In a rotary hoe of the type comprising one or
more wheels each composed of a pair of cooperat
ing plates and a plurality of circumferentially
force the plates and the stone eliminator pro 40 spaced apart, outwardly projecting, double
pronged teeth each having a U-shaped anchor
jections l9, and also provide a shoulder tending to ‘
age portion clamped ?rmly between said plates,1
together with bolts for securely connecting said
clearly seen in Figure 3 of ‘r the drawings, the 45 plates together; the improvement which com
lateral offset of the metal, which results from the ' prises a pair of plates having a plurality of sets
formation of the grooves I4, merges attheouter,
of circumferentially spaced apart, complemen
ends into the laterally projecting ?anges 2|.
tary U-shaped grooves to constitute seats for the
preclude penetration of the wheel assembly to an
excessive depth in soft or loose soil. As may be
Each of the plates I8 is formed with a central
anchorage portion of said teeth, said plates hav- .
aperture 24, surrounded by a laterally projecting
ing a plurality of sets of aligned, outwardly ex
annular ?ange 2-6. Press ?tted into the aperture 50 tending projections, disposed intermediate the
24 of the annular ?ange 26, of each plate III, is
legs of each of said grooves, and the outer mar
a hub member 21, having a ?ange 28, seated
ginal edge of each plate, intermediate adjacent
tightly against the inner face of saidr'plate. The
projections, terminating in laterally extending
?anges/28 of both hub members are of such thick
55 ?anges, the end portions of which extend
ness that when the plates H) are bolted together,
throughout a substantial portion of the length
asabove described, the outer faces of the ?anges
of the sides of said projections.
28 are disposed in abutting relation, as seen in
Figure 2, and the two hub members thus serve as
a bearing hub for mounting of the wheel on a
shaft, as indicated indot and dash outline at A} 60
inFigure 2 of the drawings.
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